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Catalyst 6000 Family Software Configuration Guide

Software Releases 6.3 and 6.4

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Customer Order Number: DOC-7813315= Text Part Number: 78-13315-02

THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS. THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY. The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB’s public domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California. NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED “AS IS” WITH ALL FAULTS. CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE. IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING, WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCO OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. CCIP, the Cisco Arrow logo, the Cisco Powered Network mark, the Cisco Systems Verified logo, Cisco Unity, Follow Me Browsing, FormShare, iQ Breakthrough, iQ Expertise, iQ FastTrack, the iQ Logo, iQ Net Readiness Scorecard, Networking Academy, ScriptShare, SMARTnet, TransPath, and Voice LAN are trademarks of Cisco Systems, Inc.; Changing the Way We Work, Live, Play, and Learn, Discover All That’s Possible, The Fastest Way to Increase Your Internet Quotient, and iQuick Study are service marks of Cisco Systems, Inc.; and Aironet, ASIST, BPX, Catalyst, CCDA, CCDP, CCIE, CCNA, CCNP, Cisco, the Cisco Certified Internetwork Expert logo, Cisco IOS, the Cisco IOS logo, Cisco Press, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Empowering the Internet Generation, Enterprise/Solver, EtherChannel, EtherSwitch, Fast Step, GigaStack, Internet Quotient, IOS, IP/TV, LightStream, MGX, MICA, the Networkers logo, Network Registrar, Packet, PIX, Post-Routing, Pre-Routing, RateMUX, Registrar, SlideCast, StrataView Plus, Stratm, SwitchProbe, TeleRouter, and VCO are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the U.S. and certain other countries. All other trademarks mentioned in this document or Web site are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0208R) Catalyst 6000 Family Software Configuration Guide Copyright © 1999-2003, Cisco Systems, Inc. All rights reserved.

C O N T E N T S

Preface

xxvii xxvii xxvii xxix

Audience

Organization Conventions

Related Documentation
xxx

Obtaining Documentation xxxi World Wide Web xxxi Documentation CD-ROM xxxi Ordering Documentation xxxi Documentation Feedback xxxi Obtaining Technical Assistance xxxii Cisco.com xxxii Technical Assistance Center xxxii
1

CHAPTER

Product Overview

1-1

CHAPTER

2

Command-Line Interfaces

2-1

Catalyst Command-Line Interface 2-1 ROM-Monitor Command-Line Interface Switch Command-Line Interface 2-2 MSFC Command-Line Interface 2-8 Cisco IOS Command Modes 2-8 Cisco IOS Command-Line Interface
3

2-1

2-10

CHAPTER

Configuring the Switch IP Address and Default Gateway Understanding the Switch Management Interfaces Understanding Automatic IP Configuration 3-2 Automatic IP Configuration Overview 3-2 Understanding How DHCP Works 3-2 Understanding How BOOTP and RARP Work Booting the MSFC for the First Time
3-4 3-5 3-1

3-1

3-3 3-4

Preparing to Configure the IP Address and Default Gateway Default IP Address and Default Gateway Configuration

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Assigning the In-Band (sc0) Interface IP Address Configuring Default Gateways
3-6

3-5

Configuring the SLIP (sl0) Interface on the Console Port Using BOOTP, DHCP, or RARP to Obtain an IP Address Renewing and Releasing a DHCP-Assigned IP Address
4

3-7 3-9 3-10

CHAPTER

Configuring Ethernet, Fast Ethernet, and Gigabit Ethernet Switching Understanding How Ethernet Works 4-1 Switching Frames Between Segments 4-2 Building the Address Table 4-2 Understanding How Port Negotiation Works

4-1

4-2 4-3

Default Ethernet, Fast Ethernet, and Gigabit Ethernet Configuration Setting the Port Configuration 4-4 Setting the Port Name 4-4 Setting the Port Speed 4-5 Setting the Port Duplex Mode 4-5 Configuring IEEE 802.3Z Flow Control 4-6 Enabling and Disabling Port Negotiation 4-7 Changing the Default Port Enable State 4-7 Setting the Port Debounce Timer 4-8 Configuring a Timeout Period for Ports in errdisable State Configuring the Jumbo Frame Feature 4-11 Checking Connectivity 4-13
5

4-9

CHAPTER

Configuring Ethernet VLAN Trunks

5-1

Understanding How VLAN Trunks Work 5-1 Trunking Overview 5-1 Trunking Modes and Encapsulation Types 802.1Q Trunk Restrictions 5-4 Default Trunk Configuration
5-5

5-2

Configuring a Trunk Link 5-5 Configuring an ISL Trunk 5-5 Configuring an 802.1Q Trunk 5-6 Configuring an ISL/802.1Q Negotiating Trunk Port Defining the Allowed VLANs on a Trunk 5-7 Disabling a Trunk Port 5-8

5-7

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Example VLAN Trunk Configurations 5-9 ISL Trunk Configuration Example 5-9 ISL Trunk Over EtherChannel Link Example 5-10 802.1Q Trunk Over EtherChannel Link Example 5-13 Load-Sharing VLAN Traffic Over Parallel Trunks Example Disabling VLAN 1 on Trunks 5-23 Disabling VLAN 1 on a Trunk Link
6
5-23

5-16

CHAPTER

Configuring EtherChannel

6-1

Understanding How EtherChannel Works 6-1 Understanding Administrative Groups 6-2 Understanding EtherChannel IDs 6-2 Understanding Port Aggregation Protocol 6-2 Understanding Frame Distribution 6-3 EtherChannel Configuration Guidelines
6-4

Configuring EtherChannel 6-5 Configuring an EtherChannel 6-5 Setting the EtherChannel Port Mode 6-5 Setting the EtherChannel Port Path Cost 6-6 Setting the EtherChannel VLAN Cost 6-6 Configuring EtherChannel Frame Distribution 6-8 Displaying EtherChannel Traffic Utilization 6-8 Displaying Outgoing Ports for a Specified Address or Layer 4 Port Number Disabling an EtherChannel 6-9
7

6-8

CHAPTER

Configuring IEEE 802.1Q Tunneling

7-1 7-1 7-2

Understanding How 802.1Q Tunneling Works 802.1Q Tunneling Configuration Guidelines

Configuring Support for 802.1Q Tunneling 7-3 Configuring the Switch to Support 802.1Q Tunneling 7-3 Configuring 802.1Q Tunnel Ports 7-4 Clearing 802.1Q Tunnel Ports 7-4 Removing Global Support for 802.1Q Tunneling 7-4
8

CHAPTER

Configuring Spanning Tree

8-1

Understanding How Spanning Tree Protocols Work 8-1 Understanding How a Topology is Created 8-2 Understanding How a Switch Becomes the Root Switch

8-3

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Understanding How Bridge Protocol Data Units Work Spanning Tree Port States 8-4 Understanding PVST+ and MISTP Modes PVST+ Mode 8-11 MISTP Mode 8-11 MISTP-PVST+ Mode 8-12 Bridge Identifiers 8-12 MAC Address Allocation MAC Address Reduction
8-12 8-12 8-10

8-3

Using PVST+ 8-14 Default PVST+ Configuration 8-14 Setting the PVST+ Bridge ID Priority 8-15 Configuring the PVST+ Port Cost 8-16 Configuring the PVST+ Port Priority 8-17 Configuring the PVST+ Default Port Cost Mode 8-17 Configuring the PVST+ Port Cost for a VLAN 8-18 Configuring the PVST+ Port Priority for a VLAN 8-18 Disabling the PVST+ Mode on a VLAN 8-19 Using MISTP-PVST+ or MISTP 8-20 Default MISTP and MISTP-PVST+ Configuration 8-21 Setting MISTP-PVST+ Mode or MISTP Mode 8-21 Configuring an MISTP Instance 8-23 Enabling an MISTP Instance 8-26 Mapping VLANs to an MISTP Instance 8-27 Disabling MISTP-PVST+ or MISTP 8-29 Configuring a Root Switch 8-29 Configuring a Primary Root Switch 8-29 Configuring a Secondary Root Switch 8-30 Configuring a Root Switch to Improve Convergence 8-31 Using Root Guard—Preventing Switches from Becoming Root Configuring Spanning Tree Timers 8-33 Configuring the Hello Time 8-33 Configuring the Forward Delay Time 8-34 Configuring the Maximum Aging Time 8-34 Understanding How BPDU Skewing Works Configuring BPDU Skewing
8-36 8-35

8-32

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CHAPTER

9

Configuring Spanning Tree PortFast, UplinkFast, BackboneFast, and Loop Guard Understanding How PortFast Works
9-2 9-2 9-2

9-1

Understanding How PortFast BPDU Guard Works Understanding How PortFast BPDU Filter Works Understanding How UplinkFast Works Understanding How Loop Guard Works Configuring PortFast 9-7 Enabling PortFast 9-8 Disabling PortFast 9-8 Configuring PortFast BPDU Guard 9-9 Enabling PortFast BPDU Guard 9-9 Disabling PortFast BPDU Guard 9-10 Configuring PortFast BPDU Filter 9-11 Enabling PortFast BPDU Filter 9-11 Disabling PortFast BPDU Filter 9-12 Configuring UplinkFast 9-13 Enabling UplinkFast 9-13 Disabling UplinkFast 9-14 Configuring BackboneFast 9-15 Enabling BackboneFast 9-15 Displaying BackboneFast Statistics Disabling BackboneFast 9-16 Configuring Loop Guard 9-17 Enabling Loop Guard 9-17 Disabling Loop Guard 9-17
10
9-2 9-4 9-5

Understanding How BackboneFast Works

9-16

CHAPTER

Configuring VTP

10-1

Understanding How VTP Works 10-1 Understanding the VTP Domain 10-2 Understanding VTP Modes 10-2 Understanding VTP Advertisements 10-2 Understanding VTP Version 2 10-3 Understanding VTP Pruning 10-3 Default VTP Configuration
10-5 10-5

VTP Configuration Guidelines

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Configuring VTP 10-6 Configuring a VTP Server 10-6 Configuring a VTP Client 10-6 Disabling VTP (VTP Transparent Mode) Enabling VTP Version 2 10-8 Disabling VTP Version 2 10-9 Enabling VTP Pruning 10-9 Disabling VTP Pruning 10-10 Displaying VTP 10-10
11

10-7

CHAPTER

Configuring VLANs

11-1

Understanding How VLANs Work 11-1 VLAN Ranges 11-2 Configurable VLAN Parameters 11-3 Default VLAN Configuration 11-4 Configuring Normal-Range VLANs 11-5 Normal-Range VLAN Configuration Guidelines Creating Normal-Range VLANs 11-5 Modifying Normal-Range VLANs 11-6 Configuring Extended-Range VLANs 11-6 Extended-Range VLAN Configuration Guidelines Creating Extended-Range VLANs 11-7
11-5

11-7

Mapping VLANs to VLANs 11-8 Mapping Reserved VLANs to Nonreserved VLANs 11-9 Deleting Reserved-to-Nonreserved VLAN Mappings 11-10 Mapping 802.1Q VLANs to ISL VLANs 11-10 Deleting 802.1Q-to-ISL VLAN Mappings 11-11 Assigning Switch Ports to a VLAN Deleting a VLAN
11-13 11-12

Configuring Private VLANs 11-13 Understanding How Private VLANs Work 11-14 Private VLAN Configuration Guidelines 11-15 Creating a Primary Private VLAN 11-18 Viewing the Port Capability of a Private VLAN Port 11-21 Deleting a Private VLAN 11-22 Deleting an Isolated, Community, or Two-Way Community VLAN Deleting a Private VLAN Mapping 11-23 Private VLAN Support on the MSFC 11-23

11-22

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Configuring FDDI VLANs

11-24

Configuring Token Ring VLANs 11-24 Understanding Token Ring TrBRF VLANs 11-25 Understanding Token Ring TrCRF VLANs 11-25 Token Ring VLAN Configuration Guidelines 11-27 Creating or Modifying a Token Ring TrBRF VLAN 11-27 Creating or Modifying a Token Ring TrCRF VLAN 11-28
12

CHAPTER

Configuring InterVLAN Routing

12-1 12-1

Understanding How InterVLAN Routing Works

Configuring InterVLAN Routing on the MSFC 12-2 MSFC Routing Configuration Guidelines 12-2 Configuring IP InterVLAN Routing on the MSFC 12-3 Configuring IPX InterVLAN Routing on the MSFC 12-3 Configuring AppleTalk InterVLAN Routing on the MSFC Configuring MSFC Features 12-4
13

12-4

CHAPTER

Configuring CEF for PFC2

13-1

Understanding How Layer 3 Switching Works 13-1 Layer 3 Switching Overview 13-2 Understanding Layer 3-Switched Packet Rewrite Understanding CEF for PFC2 13-4 Understanding NetFlow Statistics 13-9 Default CEF for PFC2 Configuration
13-10

13-2

CEF for PFC2 Configuration Guidelines and Restrictions

13-11

Configuring CEF for PFC2 13-12 Displaying Layer 3-Switching Entries on the Supervisor Engine Configuring CEF on the MSFC2 13-14 Configuring IP Multicast on the MSFC2 13-14 Displaying IP Multicast Information 13-16

13-12

Configuring NetFlow Statistics 13-22 Specifying the NetFlow Table Entry Aging-Time Value 13-23 Specifying NetFlow Table IP Entry Fast Aging Time and Packet Threshold Values Setting the Minimum Statistics Flow Mask 13-24 Excluding IP Protocol Entries from the NetFlow Table 13-25 Displaying NetFlow Statistics 13-25 Clearing NetFlow IP and IPX Statistics 13-26 Displaying NetFlow Statistics Debug Information 13-28

13-24

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14

Configuring MLS

14-1

Understanding How Layer 3 Switching Works 14-1 Understanding Layer 3-Switched Packet Rewrite Understanding MLS 14-4 Default MLS Configuration
14-10 14-11

14-2

Configuration Guidelines and Restrictions IP MLS 14-11 IP MMLS 14-12 IPX MLS 14-13

Configuring MLS 14-14 Configuring Unicast MLS on the MSFC 14-14 Configuring MLS on Supervisor Engine 1 14-17 Configuring IP MMLS 14-28
15

CHAPTER

Configuring NDE

15-1

Understanding How NDE Works 15-1 Overview of NDE and Integrated Layer 3 Switching Management Traffic Statistics Data Collection 15-2 Using NDE Filters 15-3 Default NDE Configuration
15-3

15-1

Configuring NDE 15-3 Usage Guidelines 15-4 Specifying an NDE Collector 15-4 Specifying an NDE Destination Address on the MSFC 15-5 Specifying an NDE Source Address on the MSFC 15-5 Enabling NDE 15-6 Specifying a Destination Host Filter 15-6 Specifying a Destination and Source Subnet Filter 15-6 Specifying a Destination TCP/UDP Port Filter 15-7 Specifying a Source Host and Destination TCP/UDP Port Filter Specifying a Protocol Filter 15-8 Specifying Protocols for Statistics Collection 15-8 Removing Protocols for Statistics Collection 15-8 Clearing the NDE Flow Filter 15-9 Disabling NDE 15-9 Removing the NDE IP Address 15-9 Displaying the NDE Configuration 15-10

15-7

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16

Configuring Access Control Hardware Requirements Supported ACLs 16-2 QoS ACLs 16-2 Cisco IOS ACLs 16-3 VACLs 16-3

16-1 16-1

Understanding How ACLs Work
16-2

Applying Cisco IOS ACLs and VACLs on VLANs Bridged Packets 16-7 Routed Packets 16-7 Multicast Packets 16-8

16-7

Using Cisco IOS ACLs in your Network 16-9 Hardware and Software Handling of Cisco IOS ACLs with PFC 16-10 Hardware and Software Handling of Cisco IOS ACLs with PFC2 16-12 Using VACLs with Cisco IOS ACLs 16-15 Guidelines for Configuring Cisco IOS ACLs and VACLs on the Same VLAN Interface Guidelines for Using Layer 4 Operations 16-20 Using VACLs in your Network 16-22 Wiring Closet Configuration 16-22 Redirecting Broadcast Traffic to a Specific Server Port 16-23 Restricting the DHCP Response for a Specific Server 16-24 Denying Access to a Server on Another VLAN 16-25 Restricting ARP Traffic 16-26 Configuring ACLs on Private VLANs 16-26 Capturing Traffic Flows 16-27 Unsupported Features
16-27 16-16

Configuring VACLs 16-28 VACL Configuration Guidelines 16-28 VACL Configuration Summary 16-29 Configuring VACLs From the CLI 16-29 Configuring and Storing VACLs and QoS ACLs in Flash Memory 16-42 Automatically Moving the VACL and QoS ACL Configuration to Flash Memory 16-43 Manually Moving the VACL and QoS ACL Configuration to Flash Memory 16-44 Running with the VACL and QoS ACL Configuration in Flash Memory 16-45 Moving the VACL and QoS ACL Configuration Back to NVRAM 16-46 Redundancy Synchronization Support 16-46 Interacting with High Availability 16-46

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Configuring Policy-Based Forwarding Hardware and Software Requirements

16-46 16-47

Understanding How Policy-Based Forwarding Works
16-47

Configuring Policy-Based Forwarding 16-48 Enabling PBF and Specifying a MAC Address for the PFC2 16-48 Configuring VACLs for PBF 16-50 Displaying PBF Information 16-52 Clearing Entries in PBF VACLs 16-52 Rolling Back Adjacency Table Entries in the Edit Buffer 16-53 Configuring Hosts for PBF 16-53 Policy-Based Forwarding Configuration Example 16-55
17

CHAPTER

Configuring GVRP

17-1 17-1

Understanding How GVRP Works Default GVRP Configuration
17-2

GVRP Configuration Guidelines

17-2

Configuring GVRP 17-2 Enabling GVRP Globally 17-3 Enabling GVRP on Individual 802.1Q Trunk Ports 17-3 Enabling GVRP Dynamic VLAN Creation 17-4 Configuring GVRP Registration 17-5 Configuring GVRP VLAN Declarations from Blocking Ports Setting the GARP Timers 17-7 Displaying GVRP Statistics 17-8 Clearing GVRP Statistics 17-8 Disabling GVRP on Individual 802.1Q Trunk Ports 17-8 Disabling GVRP Globally 17-9
18

17-6

CHAPTER

Configuring Dynamic Port VLAN Membership with VMPS Understanding How VMPS Works
18-1 18-2

18-1

Default VMPS and Dynamic Port Configuration

Dynamic Port VLAN Membership and VMPS Configuration Guidelines Configuring VMPS and Dynamic Port VLAN Membership Creating the VMPS Database 18-4 Configuring VMPS 18-5 Configuring Dynamic Ports on VMPS Clients 18-5 Administering and Monitoring VMPS 18-6 Configuring Static VLAN Port Membership 18-7
18-3

18-3

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Troubleshooting VMPS and Dynamic Port VLAN Membership Troubleshooting VMPS 18-8 Troubleshooting Dynamic Port VLAN Membership 18-8

18-8

Dynamic Port VLAN Membership with VMPS Configuration Examples VMPS Database Configuration File Example 18-9 Dynamic Port VLAN Membership Configuration Example 18-10 Dynamic Port VLAN Membership with Auxiliary VLANs 18-12 Configuration Guidelines 18-13 Configuring Dynamic Port VLAN Membership with Auxiliary VLANs
19

18-9

18-13

CHAPTER

Checking Port Status and Connectivity Checking Module Status Checking Port Status Using Telnet
19-4 19-1 19-2 19-4

19-1

Checking Port Capabilities

Using Secure Shell Encryption for Telnet Sessions Monitoring User Sessions
19-6

19-5

Using Ping 19-7 Understanding How Ping Works Executing Ping 19-8

19-7

Using Layer 2 Traceroute 19-9 Layer 2 Traceroute Usage Guidelines Identifying a Layer 2 Path 19-10

19-9

Using IP Traceroute 19-10 Understanding How IP Traceroute Works Executing IP Traceroute 19-11
20

19-10

CHAPTER

Administering the Switch

20-1

Setting the System Name and System Prompt 20-1 Setting the Static System Name and Prompt 20-2 Setting the System Contact and Location Setting the System Clock
20-4 20-3

Creating a Login Banner 20-4 Configuring a Login Banner 20-5 Clearing the Login Banner 20-5 Defining Command Aliases Defining IP Aliases
20-6 20-5

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Configuring Static Routes

20-7 20-8

Configuring Permanent and Static ARP Entries

Scheduling a System Reset 20-9 Scheduling a Reset at a Specific Time 20-10 Scheduling a Reset Within a Specified Amount of Time Power Management 20-11 Enabling or Disabling Power Redundancy 20-11 Using the CLI to Power Modules Up or Down 20-13 Determining System Power Requirements 20-14 Environmental Monitoring 20-16 Environmental Monitoring Using CLI Commands LED Indications 20-16
20-16

20-10

Displaying System Status Information for Technical Support Generating a System Status Report 20-18 Using System Dump Files 20-18
21

20-17

CHAPTER

Configuring Switch Access Using AAA

21-1

Understanding How Authentication Works 21-1 Authentication Overview 21-2 Understanding How Login Authentication Works 21-2 Understanding How Local Authentication Works 21-2 Understanding How TACACS+ Authentication Works 21-3 Understanding How RADIUS Authentication Works 21-4 Understanding How Kerberos Authentication Works 21-4 Understanding How 802.1x Authentication Works 21-7 Configuring Authentication 21-9 Authentication Default Configuration 21-10 Authentication Configuration Guidelines 21-11 Configuring Login Authentication 21-12 Configuring Local Authentication 21-13 Configuring TACACS+ Authentication 21-17 Configuring RADIUS Authentication 21-23 Configuring Kerberos Authentication 21-31 Configuring 802.1x Authentication 21-40 Authentication Example
21-48

Understanding How Authorization Works 21-49 Authorization Overview 21-49 Authorization Events 21-49 TACACS+ Primary Options and Fallback Options
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TACACS+ Command Authorization RADIUS Authorization 21-51

21-50

Configuring Authorization 21-51 TACACS+ Authorization Default Configuration 21-51 TACACS+ Authorization Configuration Guidelines 21-51 Configuring TACACS+ Authorization 21-52 Configuring RADIUS Authorization 21-55 Authorization Example
21-55

Understanding How Accounting Works 21-56 Accounting Overview 21-56 Accounting Events 21-57 Specifying When to Create Accounting Records Specifying RADIUS Servers 21-58 Updating the Server 21-59 Suppressing Accounting 21-59 Configuring Accounting 21-59 Accounting Default Configuration 21-59 Accounting Configuration Guidelines 21-60 Configuring Accounting 21-60 Accounting Example
22
21-63

21-57

CHAPTER

Configuring Redundancy

22-1 22-2

Understanding How Supervisor Engine Redundancy Works

Configuring Redundant Supervisor Engines 22-3 Synchronization Process Initiation 22-4 Redundant Supervisor Engine Configuration Guidelines and Restrictions Verifying Standby Supervisor Engine Status 22-5 Forcing a Switchover to the Standby Supervisor Engine 22-6 High Availability 22-8 Supervisor Engine Synchronization Examples 22-14 MSFC Redundancy 22-18 Dual MSFC Redundancy 22-19 Single Router Mode Redundancy 22-41 Manual-Mode MSFC Redundancy 22-45

22-4

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23

Modifying the Switch Boot Configuration

23-1

Understanding How the Switch Boot Configuration Works 23-1 Understanding the Boot Process 23-1 Understanding the ROM Monitor 23-2 Understanding the Configuration Register 23-2 Understanding the BOOT Environment Variable 23-3 Understanding the CONFIG_FILE Environment Variable 23-3 Default Switch Boot Configuration
23-4

Setting the Configuration Register 23-5 Setting the Boot Field in the Configuration Register 23-5 Setting the ROM-Monitor Console-Port Baud Rate 23-6 Setting CONFIG_FILE Recurrence 23-7 Setting CONFIG_FILE Overwrite 23-7 Setting CONFIG_FILE Synchronization 23-8 Setting the Switch to Ignore the NVRAM Configuration 23-9 Setting the Configuration Register Value 23-10 Setting the BOOT Environment Variable 23-10 Setting the BOOT Environment Variable 23-10 Clearing the BOOT Environment Variable Settings

23-11

Setting the CONFIG_FILE Environment Variable 23-11 Setting the CONFIG_FILE Environment Variable 23-11 Clearing the CONFIG_FILE Environment Variable Settings Displaying the Switch Boot Configuration
24
23-12

23-12

CHAPTER

Working With the Flash File System

24-1 24-1

Understanding How the Flash File System Works Working with the Flash File System 24-1 Setting the Default Flash Device 24-2 Setting the Text File Configuration Mode Listing the Files on a Flash Device 24-3 Copying Files 24-4 Deleting Files 24-6 Restoring Deleted Files 24-7 Verifying a File Checksum 24-7 Formatting a Flash Device 24-8

24-2

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25

Working with System Software Images Software Image Naming Conventions

25-1 25-1

Downloading Software Images to the Switch With TFTP 25-2 Understanding How TFTP Software Image Downloads Work Preparing to Download an Image Using TFTP 25-2 Downloading Supervisor Engine Images Using TFTP 25-3 Downloading Switching Module Images Using TFTP 25-4 TFTP Download Procedures Example 25-5 Uploading System Software Images to a TFTP Server 25-8 Preparing to Upload an Image to a TFTP Server 25-8 Uploading Software Images to a TFTP Server 25-9 Downloading System Software Images Using rcp 25-9 Preparing to Download an Image Using rcp 25-9 Downloading Supervisor Engine Images Using rcp 25-10 Downloading Switching Module Images Using rcp 25-10 Example rcp Download Procedures 25-11 Uploading System Software Images to an rcp Server 25-14 Preparing to Upload an Image to an rcp Server 25-15 Uploading Software Images to an rcp Server 25-15

25-2

Downloading Software Images Over a Serial Connection on the Console Port Preparing to Download an Image Using Kermit 25-16 Downloading Software Images Using Kermit (PC Procedure) 25-16 Downloading Software Images Using Kermit (UNIX Procedure) 25-17 Example Serial Software Image Download Procedures 25-18 Downloading a System Image Using Xmodem or Ymodem
26
25-21

25-15

CHAPTER

Working with Configuration Files

26-1

Working with Configuration Files on the Switch 26-1 Creating and Using Configuration File Guidelines 26-1 Creating a Configuration File 26-2 Downloading Configuration Files to the Switch Using TFTP Uploading Configuration Files to a TFTP Server 26-5 Copying Configuration Files Using rcp 26-6 Downloading Configuration Files from an rcp Server 26-6 Uploading Configuration Files to an rcp Server 26-7 Clearing the Configuration 26-8

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Contents Working with Configuration Files on the MSFC 26-9 Uploading the Configuration File to a TFTP Server 26-10 Uploading the Configuration File to the Supervisor Engine Flash PC Card 26-11 Downloading the Configuration File from a Remote Host 26-11 Downloading the Configuration File from the Supervisor Engine Flash PC Card 26-13 27 CHAPTER Configuring System Message Logging System Log Message Format 27-3 27-1 27-1 Understanding How System Message Logging Works Default System Message Logging Configuration 27-4 Configuring System Message Logging 27-4 Enabling and Disabling Session Logging Settings 27-5 Setting the System Message Logging Levels 27-6 Enabling and Disabling the Logging Time Stamp Enable State 27-6 Setting the Logging Buffer Size 27-6 Configuring the syslog Daemon on a UNIX syslog Server 27-7 Configuring syslog Servers 27-7 Displaying the Logging Configuration 27-9 Displaying System Messages 27-10 28 CHAPTER Configuring DNS 28-1 28-1 Understanding How DNS Works DNS Default Configuration 28-1 Configuring DNS 28-2 Setting Up and Enabling DNS 28-2 Clearing a DNS Server 28-3 Clearing the DNS Domain Name 28-3 Disabling DNS 28-3 29 CHAPTER Configuring CDP 29-1 29-1 Understanding How CDP Works Default CDP Configuration 29-2 Configuring CDP 29-2 Setting the CDP Global Enable and Disable States 29-2 Setting the CDP Enable and Disable States on a Port 29-3 Setting the CDP Message Interval 29-4 Setting the CDP Holdtime 29-4 Displaying CDP Neighbor Information 29-5 Catalyst 6000 Family Software Configuration Guide. Releases 6.3 and 6.4 xviii 78-13315-02 .

Contents CHAPTER 30 Configuring UDLD 30-1 30-1 Understanding How UDLD Works Default UDLD Configuration 30-2 Configuring UDLD 30-3 Enabling UDLD Globally 30-3 Enabling UDLD on Individual Ports 30-3 Disabling UDLD on Individual Ports 30-4 Disabling UDLD Globally 30-4 Specifying the UDLD Message Interval 30-4 Enabling UDLD Aggressive Mode 30-5 Displaying the UDLD Configuration 30-5 31 CHAPTER Configuring NTP 31-1 31-1 Understanding How NTP Works NTP Default Configuration 31-2 Configuring NTP 31-2 Enabling NTP in Broadcast-Client Mode 31-3 Configuring NTP in Client Mode 31-3 Configuring Authentication in Client Mode 31-4 Setting the Time Zone 31-5 Enabling the Daylight Saving Time Adjustment 31-5 Disabling the Daylight Saving Time Adjustment 31-7 Clearing the Time Zone 31-7 Clearing NTP Servers 31-7 Disabling NTP 31-8 32 CHAPTER Configuring Broadcast Suppression 32-1 32-1 Understanding How Broadcast Suppression Works Configuring Broadcast Suppression 32-2 Enabling Broadcast Suppression 32-3 Disabling Broadcast Suppression 32-4 33 CHAPTER Configuring Layer 3 Protocol Filtering 33-1 33-1 Understanding How Layer 3 Protocol Filtering Works Default Layer 3 Protocol Filtering Configuration Configuring Layer 3 Protocol Filtering 33-2 Enabling Layer 3 Protocol Filtering 33-3 Disabling Layer 3 Protocol Filtering 33-3 33-2 Catalyst 6000 Family Software Configuration Guide. Releases 6.4 78-13315-02 xix .3 and 6.

Contents CHAPTER 34 Configuring the IP Permit List 34-1 34-1 Understanding How the IP Permit List Works IP Permit List Default Configuration 34-2 Configuring the IP Permit List 34-2 Adding IP Addresses to the IP Permit List Enabling the IP Permit List 34-3 Disabling the IP Permit List 34-4 Clearing an IP Permit List Entry 34-4 35 34-2 CHAPTER Configuring Port Security 35-1 Understanding How Port Security Works 35-1 Allowing Traffic Based on the Host MAC Address 35-1 Restricting Traffic Based on the Host MAC Address 35-2 Port Security Configuration Guidelines 35-3 Configuring Port Security 35-3 Enabling Port Security 35-3 Setting the Maximum Number of Secure MAC Addresses Setting the Port Security Age Time 35-5 Clearing MAC Addresses 35-5 Specifying the Security Violation Action 35-6 Setting the Shutdown Timeout 35-6 Disabling Port Security 35-7 Restricting Traffic Based on a Host MAC Address 35-7 Displaying Port Security 35-8 36 35-4 CHAPTER Configuring SNMP SNMP Terminology 36-1 36-1 Understanding SNMP 36-3 Security Models and Levels 36-4 SNMP ifindex Persistence Feature 36-5 36-5 Understanding How SNMPv1 and SNMPv2c Works Using Managed Devices 36-5 Using SNMP Agents and MIBs 36-5 Using CiscoWorks2000 36-6 Understanding SNMPv3 SNMP Entity 36-7 Applications 36-9 36-7 Catalyst 6000 Family Software Configuration Guide. Releases 6.4 xx 78-13315-02 .3 and 6.

3 and 6.4 78-13315-02 xxi .Contents Configuring SNMPv1 and SNMPv2c 36-10 SNMPv1 and SNMPv2c Default Configuration 36-10 Configuring SNMPv1 and SNMPv2c from an NMS 36-10 Configuring SNMPv1 and SNMPv2c from the CLI 36-10 Configuring SNMPv3 36-11 SNMPv3 Default Configuration 36-11 Configuring SNMPv3 from an NMS 36-11 Configuring SNMPv3 from the CLI 36-12 37 CHAPTER Configuring RMON Enabling RMON 37-1 37-1 Understanding How RMON Works 37-2 37-2 Viewing RMON Data Supported RMON and RMON2 MIB Objects 38 37-2 CHAPTER Configuring SPAN and RSPAN 38-1 38-1 Understanding How SPAN and RSPAN Works SPAN Session 38-2 Destination Port 38-2 Source Port 38-2 Ingress SPAN 38-3 Egress SPAN 38-3 VSPAN 38-3 Trunk VLAN Filtering 38-4 SPAN Traffic 38-4 SPAN and RSPAN Session Limits 38-4 Configuring SPAN 38-5 SPAN Hardware Requirements 38-5 Understanding How SPAN Works 38-5 SPAN Configuration Guidelines 38-6 Configuring SPAN from the CLI 38-6 Configuring RSPAN 38-8 RSPAN Hardware Requirements 38-8 Understanding How RSPAN Works 38-9 RSPAN Configuration Guidelines 38-9 Configuring RSPAN 38-10 RSPAN Configuration Examples 38-13 Catalyst 6000 Family Software Configuration Guide. Releases 6.

Releases 6.3 and 6.Contents CHAPTER 39 Using Switch TopN Reports 39-1 Understanding How the Switch TopN Reports Utility Works 39-1 TopN Reports Overview 39-1 Running Switch TopN Reports without the Background Option 39-2 Running Switch TopN Reports with the Background Option 39-2 Running and Viewing Switch TopN Reports 40 39-3 CHAPTER Configuring Multicast Services 40-1 Understanding How Multicasting Works 40-1 Multicasting and Multicast Services Overview 40-2 Understanding How IGMP Snooping Works 40-2 Understanding How GMRP Works 40-4 Understanding How RGMP Works 40-5 Suppressing Multicast Traffic 40-5 Nonreverse Path Forwarding Multicast Fast Drop 40-5 Enabling Installation of Directly Connected Subnets 40-6 Configuring IGMP Snooping 40-6 Default IGMP Snooping Configuration 40-7 Enabling IGMP Snooping 40-7 Enabling IGMP Fast-Leave Processing 40-8 Displaying Multicast Router Information 40-8 Displaying Multicast Group Information 40-9 Displaying IGMP Snooping Statistics 40-10 Disabling IGMP Fast-Leave Processing 40-10 Disabling IGMP Snooping 40-11 Configuring GMRP 40-11 GMRP Software Requirements 40-11 Default GMRP Configuration 40-11 Enabling GMRP Globally 40-12 Enabling GMRP on Individual Switch Ports 40-12 Disabling GMRP on Individual Switch Ports 40-13 Enabling GMRP Forward-All Option 40-14 Disabling GMRP Forward-All Option 40-14 Configuring GMRP Registration 40-14 Setting the GARP Timers 40-16 Displaying GMRP Statistics 40-17 Clearing GMRP Statistics 40-18 Disabling GMRP Globally on the Switch 40-18 Catalyst 6000 Family Software Configuration Guide.4 xxii 78-13315-02 .

and Marking 41-24 QoS Statistics Data Export 41-27 QoS Default Configuration 41-28 41-10 Configuring QoS 41-30 Enabling QoS 41-31 Enabling Port-Based or VLAN-Based QoS 41-32 Configuring the Trust State of a Port 41-32 Configuring the CoS Value for a Port 41-33 Creating Policing Rules 41-34 Deleting Policing Rules 41-36 Creating or Modifying ACLs 41-37 Attaching ACLs to Interfaces 41-46 Detaching ACLs from Interfaces 41-46 Mapping a CoS Value to a Host Destination MAC Address/VLAN Pair 41-47 Deleting a CoS Value to a Host Destination MAC Address/VLAN Pair 41-47 Enabling or Disabling Microflow Policing of Bridged Traffic 41-48 Configuring Standard Receive-Queue Tail-Drop Thresholds 41-48 Configuring 2q2t Port Standard Transmit-Queue Tail-Drop Thresholds 41-49 Configuring Standard Transmit-Queue WRED-Drop Thresholds 41-49 Allocating Bandwidth Between Standard Transmit Queues 41-50 Configuring the Receive-Queue Size Ratio 41-51 Catalyst 6000 Family Software Configuration Guide. Marking. Scheduling.Contents Configuring Multicast Router Ports and Group Entries Specifying Multicast Router Ports 40-19 Configuring Multicast Groups 40-19 Clearing Multicast Router Ports 40-20 Clearing Multicast Group Entries 40-20 Configuring RGMP 40-21 Configuring RGMP on the Supervisor Engine Configuring RGMP on the MSFC 40-24 Displaying Multicast Protocol Status 41 40-24 40-18 40-21 CHAPTER Configuring QoS 41-1 Understanding How QoS Works 41-1 Definitions 41-2 Flowcharts 41-3 QoS Feature Set Summary 41-8 Ethernet Ingress Port Marking. and Policing with a Layer 3 Switching Engine 41-14 Classification and Marking with a Layer 2 Switching Engine 41-24 Ethernet Egress Port Scheduling. Releases 6.4 78-13315-02 xxiii . and Classification Classification. Congestion Avoidance.3 and 6. Congestion Avoidance.

Contents Configuring the Transmit-Queue Size Ratio 41-51 Mapping CoS Values to Drop Thresholds 41-52 Configuring DSCP Value Maps 41-55 Displaying QoS Information 41-58 Displaying QoS Statistics 41-59 Reverting to QoS Defaults 41-60 Disabling QoS 41-60 Configuring COPS Support 41-60 Configuring RSVP Support 41-66 Configuring QoS Statistics Data Export 41-70 42 CHAPTER Configuring ASLB 42-1 42-1 Hardware and Software Requirements Understanding How ASLB Works 42-2 Layer 3 Operations for ASLB 42-3 Layer 2 Operations for ASLB 42-3 Client-to-Server Data Forwarding 42-4 Server-to-Client Data Forwarding 42-6 Cabling Guidelines 42-7 Configuring ASLB 42-7 Configuring the LocalDirector Interfaces ASLB Configuration Guidelines 42-8 Configuring ASLB from the CLI 42-11 ASLB Configuration Example 42-19 42-7 ASLB Redundant Configuration Example 42-21 IP Addresses 42-22 MAC Addresses 42-23 Catalyst 6000 Family Switch 1 Configuration Catalyst 6000 Family Switch 2 Configuration Router 1 Configuration 42-23 Router 2 Configuration 42-24 LocalDirector Configuration 42-24 Troubleshooting the ASLB Configuration 43 42-25 42-23 42-23 CHAPTER Configuring the Switch Fabric Modules 43-1 43-1 43-2 Understanding How the Switch Fabric Module Works Configuring and Monitoring the Switch Fabric Module Catalyst 6000 Family Software Configuration Guide. Releases 6.4 xxiv 78-13315-02 .3 and 6.

Contents Configuring a Fallback Option 43-3 Configuring the Switching Mode 43-3 Switch Fabric Redundancy 43-4 Monitoring the Switch Fabric Module 43-4 Configuring the LCD Banner 43-8 44 CHAPTER Configuring a VoIP Network 44-1 44-1 44-2 Hardware and Software Requirements Understanding How a VoIP Network Works Cisco IP Phone 7960 44-2 Cisco CallManager 44-4 Access Gateways 44-4 How a Call Is Made 44-7 Understanding How VLANs Work 44-8 Configuring VoIP on a Switch 44-9 Voice-Related CLI Commands 44-9 Configuring Per-Port Power Management 44-10 Configuring Auxiliary VLANs on Catalyst LAN Switches Configuring the Access Gateways 44-21 Displaying Active Call Information 44-27 Configuring QoS in the Cisco IP Phone 7960 44-29 44-19 INDEX Catalyst 6000 Family Software Configuration Guide. Releases 6.4 78-13315-02 xxv .3 and 6.

Contents Catalyst 6000 Family Software Configuration Guide.4 xxvi 78-13315-02 . Releases 6.3 and 6.

and Gigabit Ethernet Switching Configuring Ethernet VLAN Trunks Description Presents an overview of the Catalyst 6000 family switches. how it is organized. Chapter 6 Chapter 7 Chapter 8 Configuring EtherChannel Configuring IEEE 802. Describes how to configure Ethernet. Fast Ethernet. Describes how to perform a baseline configuration of the switch.x) and Policy Feature Card Configuration Guide. Describes how to configure Inter-Switch Link (ISL) and IEEE 802.1Q tunneling. Organization Note This publication includes the information that previously was in the Catalyst 6000 Family Multilayer Switch Feature Card (12.Preface This preface describes who should read the Catalyst 6000 Family Software Configuration Guide.4 78-13315-02 xxvii . This publication is organized as follows: Chapter Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 Title Product Overview Command-Line Interfaces Configuring the Switch IP Address and Default Gateway Configuring Ethernet. Describes how to configure the Spanning Tree Protocol and explains how spanning tree works. and Gigabit Ethernet switching. and its document conventions. Audience This publication is for experienced network administrators who are responsible for configuring and maintaining Catalyst 6000 family switches. Describes how to configure Fast EtherChannel and Gigabit EtherChannel port bundles. Fast Ethernet. Describes how to configure 802.3 and 6.1Q VLAN trunks on Fast Ethernet and Gigabit Ethernet ports.1Q Tunneling Configuring Spanning Tree Catalyst 6000 Family Software Configuration Guide—Releases 6. Describes how to use the command-line interface (CLI).

Describes how to download and upload system software images. Describes how to configure the spanning tree PortFast.4 xxviii 78-13315-02 . authorization. UplinkFast. Fast Ethernet. Describes how to configure Cisco Discovery Protocol (CDP). Describes how to configure dynamic port VLAN membership on the switch using the VLAN Management Policy Server (VMPS). and perform other administrative tasks on the switch. Describes how to configure Multilayer Switching (MLS). and accounting (AAA) to monitor and control access to the CLI. Describes how to configure protocol filtering on Ethernet. BackboneFast. and BackboneFast features. Configuring VTP Configuring VLANs Configuring InterVLAN Routing Configuring CEF for PFC2 Configuring MLS Configuring NDE Configuring Access Control Configuring GVRP Configuring Dynamic Port VLAN Membership with VMPS Checking Port Status and Connectivity Describes how to configure VLAN Trunk Protocol (VTP) on the switch. Describes how to configure interVLAN routing on the MSFC. Describes how to create. Describes how to configure NetFlow Data Export (NDE). create a login banner. Describes how to modify the switch boot configuration. Describes how to configure the IP permit list. Describes how to configure the UniDirectional Link Detection (UDLD) protocol. and Loop Guard UplinkFast. Describes how to configure system message logging (syslog). Telnet. and Gigabit Ethernet ports. Chapter 20 Chapter 21 Chapter 22 Chapter 23 Administering the Switch Configuring Switch Access Using AAA Configuring Redundancy Modifying the Switch Boot Configuration Chapter 24 Chapter 25 Chapter 26 Chapter 27 Chapter 28 Chapter 29 Chapter 30 Chapter 31 Chapter 32 Chapter 33 Chapter 34 Working With the Flash File System Working with System Software Images Working with Configuration Files Configuring System Message Logging Configuring DNS Configuring CDP Configuring UDLD Configuring NTP Configuring Broadcast Suppression Configuring Layer 3 Protocol Filtering Configuring the IP Permit List Catalyst 6000 Family Software Configuration Guide—Releases 6. download. Describes how to work with the Flash file system. Describes how to configure GARP VLAN Registration Protocol (GVRP) on the switch. Describes how to configure authentication. Describes how to install and configure redundant supervisor engines and MSFCs in the Catalyst 6000 family switches. Describes how to configure VLANs on the switch. and upload switch configuration files. Describes how to configure hardware and software broadcast suppression. Describes how to configure Domain Name System (DNS).3 and 6. and IP traceroute. Describes how to display information about modules and switch ports and how to check connectivity using ping. Describes how to set the system name. Describes how to configure Cisco Express Forwarding for Policy Feature Card 2 (CEF for PFC2). Describes how to configure Network Time Protocol (NTP).Preface Organization Chapter Chapter 9 Chapter 10 Chapter 11 Chapter 12 Chapter 13 Chapter 14 Chapter 15 Chapter 16 Chapter 17 Chapter 18 Chapter 19 Title Description Configuring Spanning Tree PortFast. Describes how to configure access control lists (ACLs). including the BOOT environment variable and the configuration register.

Describes how to configure a Voice-over-IP (VoIP) network. Describes how to configure the Switch Port Analyzer (SPAN) and Remote SPAN (RSPAN). MSM.com/public/sw-center/netmgmt/cmtk/mibs. and ATM modules. GARP Multicast Registration Protocol (GMRP).4 78-13315-02 xxix .x Cisco IOS Configuration Guides and Command References—Use these publications to help you configure the Cisco IOS software that runs on the MSFC. Describes how to generate switch TopN reports.cisco. refer to http://www. For information about MIBs. and Catalyst 2980G Release Notes for Catalyst 6000 Family Software Release 6.shtml Catalyst 6000 Family Software Configuration Guide—Releases 6. Describes how to configure Internet Group Management Protocol (IGMP) snooping. Describes how to configure SNMP. and Router Group Management Protocol (RGMP).Preface Related Documentation Chapter Chapter 35 Chapter 36 Chapter 37 Chapter 38 Chapter 39 Chapter 40 Title Configuring Port Security Configuring SNMP Configuring RMON Configuring SPAN and RSPAN Using Switch TopN Reports Configuring Multicast Services Description Describes how to configure secure port filtering. Catalyst 5000 Family. Catalyst 2948G. Describes how to configure the Switch Fabric Module. Describes how to configure Remote Monitoring (RMON). Chapter 41 Chapter 42 Chapter 43 Chapter 44 Configuring QoS Configuring ASLB Configuring the Switch Fabric Modules Configuring a VoIP Network Related Documentation The following publications are available for the Catalyst 6000 family switches: • • • • • • • Catalyst 6000 Family Module Installation Guide Catalyst 6000 Family Command Reference ATM Software Configuration and Command Reference—Catalyst 5000 Family and Catalyst 6000 Family Switches System Message Guide—Catalyst 6000 Family. Describes how to configure accelerated server load balancing (ASLB). and Catalyst 4000 Family.3 and 6. Describes how to configure Quality of Service (QoS).

Cautions use the following conventions: Caution Means reader be careful. This publication uses the following conventions: Convention boldface font italic font [ ] {x|y|z} [x|y|z] string Description Commands. the term supervisor engine is used to refer to both Supervisor Engine 1 and Supervisor Engine 2. font screen boldface screen screen Terminal sessions and information the system displays are in font. Elements in square brackets are optional. ^ The symbol ^ represents the key labeled Control—for example.Preface Conventions Conventions Note Throughout this publication. screen Information you must enter is in boldface font. font italic screen font Arguments for which you supply values are in italic screen font. A nonquoted set of characters.3 and 6.4 xxx 78-13315-02 . Arguments for which you supply values are in italics. Optional alternative keywords are grouped in brackets and separated by vertical bars. such as passwords are in angle brackets. you might do something that could result in equipment damage or loss of data. Nonprinting characters. Catalyst 6000 Family Software Configuration Guide—Releases 6. Notes contain helpful suggestions or references to material not covered in the publication. In this situation. the key combination ^D in a screen display means hold down the Control key while you press the D key. This pointer highlights an important line of text in an example. and keywords are in boldface. except where noted. command options. Do not use quotation marks around the string or the string will include the quotation marks. Alternative keywords are grouped in braces and separated by vertical bars. < > Notes use the following conventions: Note Means reader take note.

and other technical resources. Registered Cisco.com users can order the Documentation CD-ROM (Customer Order Number DOC-CONDOCCD=) through the online Subscription Store: http://www.com You can access the most current Cisco documentation on the World Wide Web at this URL: http://www.com/univercd/cc/td/doc/es_inpck/pdi.) at 408 526-7208 or.com/univercd/home/home.com users can order documentation through a local account representative by calling Cisco Systems Corporate Headquarters (California.shtml • Registered Cisco.cisco.4 78-13315-02 xxxi .S.com/go/subscription Ordering Documentation You can find instructions for ordering documentation at this URL: http://www. U. These sections explain how to obtain technical information from Cisco Systems.cisco.com/en/US/partner/ordering/index.htm You can access the Cisco website at this URL: http://www. technical assistance.htm You can order Cisco documentation in these ways: • Registered Cisco.cisco. which may have shipped with your product.com users can order the Documentation CD-ROM (product number DOC-CONDOCCD=) through the online Subscription Store: http://www.cisco.cisco. Cisco. Catalyst 6000 Family Software Configuration Guide—Releases 6.com/public/countries_languages.com International Cisco web sites can be accessed from this URL: http://www.shtml Documentation CD-ROM Cisco documentation and additional literature are available in a Cisco Documentation CD-ROM package. by calling 800 553-NETS (6387). The Documentation CD-ROM is updated monthly and may be more current than printed documentation. The CD-ROM package is available as a single unit or through an annual subscription.com/go/subscription • Nonregistered Cisco.Preface Obtaining Documentation Obtaining Documentation Cisco provides several ways to obtain documentation.3 and 6.A.com users (Cisco direct customers) can order Cisco product documentation from the Networking Products MarketPlace: http://www.cisco.cisco. elsewhere in North America.

com. as a starting point for all technical assistance. which includes the Cisco Technical Assistance Center (TAC) Website.com provides a broad range of features and services to help you with these tasks: • • • • • Streamline business processes and improve productivity Resolve technical issues with online support Download and test software packages Order Cisco learning materials and merchandise Register for online skill assessment.com at this URL: http://www. Cisco.cisco. Two levels of support are available: the Cisco TAC website and the Cisco TAC Escalation Center. On the Cisco Documentation home page.com registered users have complete access to the technical support resources on the Cisco TAC website.com. or solution. you can self-register on Cisco. The avenue of support that you choose depends on the priority of the problem and the conditions stated in service contracts. services. Cisco. and sample configurations from the Cisco TAC website. and resources at any time. Cisco. including TAC tools and utilities. Customers and partners can obtain online documentation. and certification programs To obtain customized information and service. training. when applicable. CA 95134-9883 We appreciate your comments. You can e-mail your comments to bug-doc@cisco.4 xxxii 78-13315-02 . networked services that let you access Cisco information.com.com Technical Assistance Center The Cisco TAC is available to all customers who need technical assistance with a Cisco product. technology. troubleshooting tips. Catalyst 6000 Family Software Configuration Guide—Releases 6. Obtaining Technical Assistance Cisco provides Cisco.Preface Obtaining Technical Assistance Documentation Feedback You can submit comments electronically on Cisco.com offers a suite of interactive. programs. click Feedback at the top of the page. from anywhere in the world. You can submit your comments by mail by using the response card behind the front cover of your document or by writing to the following address: Cisco Systems Attn: Customer Document Ordering 170 West Tasman Drive San Jose.com Cisco.3 and 6. networking solutions.

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ciscopress. technologies. go to Cisco Press online at this URL: http://www. Internetworking Technology Handbook.com/en/US/about/ac123/ac147/about_cisco_the_internet_protocol_journal.com/en/US/about/ac123/ac114/about_cisco_packet_magazine. You can access the Internet Protocol Journal at this URL: http://www. You can access iQ Magazine at this URL: http://business.html • iQ Magazine is the Cisco monthly periodical that provides business leaders and decision makers with the latest information about the networking industry.html • Internet Protocol Journal is a quarterly journal published by Cisco Systems for engineering professionals involved in the design.4 xxxiv 78-13315-02 . with current offerings in network training listed at this URL: http://www. Internetworking Troubleshooting Guide.cisco.cisco.html • Cisco Press publishes a wide range of networking publications.html • Training—Cisco offers world-class networking training.Preface Obtaining Additional Publications and Information Obtaining Additional Publications and Information Information about Cisco products. development.html Catalyst 6000 Family Software Configuration Guide—Releases 6. Access the Cisco Product Catalog at this URL: http://www.3 and 6. and operation of public and private internets and intranets. and network solutions is available from various online and printed sources. You can access Packet magazine at this URL: http://www. Cisco suggests these titles for new and experienced users: Internetworking Terms and Acronyms Dictionary.taf%3fasset_id=44699&public_view=true&kbns=1.cisco.com • Packet magazine is the Cisco monthly periodical that provides industry professionals with the latest information about the field of networking. For current Cisco Press titles and other information.cisco.com/en/US/products/products_catalog_links_launch.com/en/US/learning/le31/learning_recommended_training_list.cisco. and the Internetworking Design Guide. • The Cisco Product Catalog describes the networking products offered by Cisco Systems as well as ordering and customer support services.com/prod/tree.

C H A P T E R 1 Product Overview The Catalyst 6000 family switches support the following configurations: • • • • • Supervisor Engine 2. modules. software features.4 78-13315-02 1-1 . Note This publication includes the information that previously was in the Catalyst 6000 Family Multilayer Switch Feature Card (12. Catalyst 6000 Family Software Configuration Guide—Releases 6. protocols.x publication for complete information about the chassis. and MSFC or MSFC2 Supervisor Engine 1 and PFC Supervisor Engine 1 Note The Switch Fabric Module is supported only in Catalyst 6500 series switches. Refer to the Release Notes for Catalyst 6000 Family Software Release 6.3 and 6. PFC. Policy Feature Card 2 (PFC2).x) and Policy Feature Card Configuration Guide. and MIBs supported by the Catalyst 6000 family switches. and Multilayer Switch Feature Card 2 (MSFC2) Supervisor Engine 2 and PFC2 Supervisor Engine 1.

Chapter 1 Product Overview Catalyst 6000 Family Software Configuration Guide—Releases 6.4 1-2 78-13315-02 .3 and 6.

regardless of whether the Break key is configured to be off by configuration register settings. Note For a description of the ATM Cisco IOS CLI and commands. or if the configuration register is set to enter ROM-monitor mode. page 2-ii ROM-Monitor Command-Line Interface The ROM monitor is a ROM-based program that executes upon platform power-up. The system enters ROM-monitor mode if the switch does not find a valid system image. For a description of the Multilayer Switch Module (MSM) IOS CLI and commands. Catalyst 6000 Family Software Configuration Guide—Releases 6. page 2-i Switch Command-Line Interface.3 and 6.4 78-13315-02 2-1 . you can load a system image manually from Flash memory. refer to the Multilayer Switch Module Installation and Configuration Note. or when a fatal exception occurs. refer to the Catalyst 6000 Family Command Reference publication. You can enter ROM-monitor mode by restarting the switch and pressing the Break key during the first 60 seconds of startup. or from bootflash. page 2-i MSFC Command-Line Interface. From the ROM-monitor mode. if the NVRAM configuration is corrupted. reset. Note The Break key is always enabled for 60 seconds after rebooting the system. page 2-viii Catalyst Command-Line Interface These sections describe the Catalyst CLI: • • ROM-Monitor Command-Line Interface. This chapter consists of these sections: • • Catalyst Command-Line Interface. For descriptions of all switch and ROM monitor commands.C H A P T E R 2 Command-Line Interfaces This chapter describes the command-line interface (CLI) you use to configure the Catalyst 6000 family switches and Ethernet modules. refer to the ATM Software Configuration Guide and Command Reference—Catalyst 5000 Family and 6000 Family Switches publication. from a network server file.

page 2-iii Working With the Command-Line Interface.3 and 6.4 2-2 78-13315-02 . perform this task: Task Command — — Step 1 Step 2 Initiate a connection from the terminal to the switch console prompt and press Return. you can escape to the Telnet prompt and enter the send break command for your terminal emulation program to break into ROM-monitor mode.Chapter 2 Catalyst Command-Line Interface Command-Line Interfaces To access the ROM monitor through a terminal server. page 2-v Accessing the Switch CLI You can access the CLI through the supervisor engine console port or through a Telnet session. These sections describe how to access the switch CLI: • • Accessing the CLI through the Console Port. Switch Command-Line Interface The switch CLI is a basic command-line interpreter. similar to the UNIX C shell. At the prompt. Use the ? command to see the available ROM-monitor commands. If necessary. page 2-iii Accessing the CLI through the Console Port To access the switch CLI through the console port. These sections describe how to use the switch CLI: • • • Accessing the Switch CLI. page 2-ii Accessing the CLI through Telnet. To access the switch through the console port. the prompt changes to rommon>. When finished. indicating that you have accessed the CLI in normal mode. enter privileged mode (you must enter privileged mode to change the switch configuration). Enter the necessary commands to complete the desired tasks. page 2-ii Accessing the MSFC from the Switch. you must connect a console terminal to the console port through an EIA/TIA-232 (RS-232) cable. Step 3 enable Step 4 Step 5 — exit Catalyst 6000 Family Software Configuration Guide—Releases 6. Note For complete information on how to connect to the supervisor engine console port. enter the system password. Once you are in ROM-monitor mode. refer to the hardware documentation for your switch. The Console> prompt appears. exit the session.

Chapter 2 Command-Line Interfaces Catalyst Command-Line Interface After accessing the switch through the console port. At the prompt. you must first set the IP address for the switch. — exit Step 2 Step 3 Step 4 This example shows how to open a Telnet session to the switch: unix_host% telnet Catalyst_1 Trying 172. To access the switch CLI from a remote host using Telnet. If — no password has been configured. Connected to Catalyst_1. Enter the necessary commands to complete your desired tasks.10. Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6. enter the telnet command telnet {hostname | ip_addr} and the name or IP address of the switch you want to access. see the “Assigning the In-Band (sc0) Interface IP Address” section on page 3-5. press Return. For information about setting the IP address.16. Telnet sessions disconnect automatically after remaining idle for a set time period. enter the password for the CLI.4 78-13315-02 2-3 .10.. Up to eight simultaneous Telnet sessions are supported. When finished. you see this display: Cisco Systems Console Enter password: Console> Accessing the CLI through Telnet Before you can open a Telnet session to the switch. Cisco Systems Console Enter password: Catalyst_1> Accessing the MSFC from the Switch These sections describe how to access the Multilayer Switch Feature Card (MSFC) from a directly connected console port or from a Telnet session: • • Accessing the MSFC from the Console Port. page 2-iv Accessing the MSFC from a Telnet Session.. exit the Telnet session. Escape character is '^]'. perform this task: Task Step 1 Command From the remote host. page 2-iv See the “MSFC Command-Line Interface” section on page 2-viii.

Note The supervisor engine software sees the MSFC as module 15 (when installed on a supervisor engine in slot 1) or module 16 (when installed on a supervisor engine in slot 2). Type ^C^C^C to switch back. enter the exit command at the Router> prompt. The mod keyword specifies the module number of the MSFC. Note To access the Cisco IOS CLI on the standby MSFC.Chapter 2 Catalyst Command-Line Interface Command-Line Interfaces Accessing the MSFC from the Console Port You can enter the switch console command to access the MSFC from the switch CLI directly connected to the supervisor engine console port. Command switch console [mod]1 1. To exit from the MSFC CLI and return to the switch CLI. This example shows how to access the MSFC from the switch CLI. perform this task: Task Access the MSFC from the switch CLI. This example shows how to access the active MSFC from the switch CLI from the active supervisor engine..4 2-4 78-13315-02 . Router> ^C^C^C Console> (enable) Accessing the MSFC from a Telnet Session You can enter the session mod command to access the MSFC from the switch CLI using a Telnet session. enter ^C^C^C at the Router> prompt. connect to the console port of the standby supervisor engine. the console will switch to the MSFC on the active supervisor engine. If no module number is specified. and how to exit the MSFC CLI and return to the switch CLI: Console> (enable) switch console 15 Trying Router-15.3 and 6.. either 15 (if the MSFC is installed on the supervisor engine in slot 1) or 16 (if the MSFC is installed on the supervisor engine in slot 2). and how to exit the MSFC CLI and return to the switch CLI: Console> (enable) session 15 Router> exit Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. To access the MSFC from the switch CLI. Connected to Router-15.. To exit from the MSFC CLI back to the switch CLI..

and 8 on module 3 Catalyst 6000 Family Software Configuration Guide—Releases 6. use the module number. Catalyst 6000 family switches are multimodule systems. ports. For example. page 2-v Designating Modules. You can abbreviate commands and parameters as long as they contain enough letters to be distinguished from any other currently available commands or parameters. To return to normal mode. the system enters normal mode automatically. page 2-vi Command Line Editing. and VLANs on the Command Line Switch commands are not case sensitive. You can access privileged mode by entering the enable command followed by the privileged-mode password. This example shows how to enter privileged mode: Console> enable Enter Password: <password> Console> (enable) Designating Modules. and VLANs are numbered starting with 1. and VLANs on the Command Line. After you log in. which gives you access to normal-mode commands only. Enter privileged-mode commands to configure the system and perform basic troubleshooting. or VLAN. page 2-v Designating MAC Addresses. Commands you enter from the CLI might apply to the entire system or to a specific module. such as set trunk and set port channel. Port 1 is always the left-most port. To designate a specific module. Ports. 5. residing in slot 1. page 2-vi History Substitution. and IP Aliases. 6. you can enter lists of ports.Chapter 2 Command-Line Interfaces Catalyst Command-Line Interface Working With the Command-Line Interface These sections describe how to work with the switch CLI: • • • • • • Switch CLI Command Modes. use a comma-separated list (do not insert spaces) to specify individual ports or a hyphen (-) between the port numbers to specify a range of ports. Table 2-1 Designating Ports and Port Ranges Example 2/1 3/4-8 Function Specifies port 1 on module 2 Specifies ports 4. To specify a range of ports. port 1. Ports. Modules.4 78-13315-02 2-5 . Enter normal-mode commands for everyday system monitoring. enter the disable command at the prompt. In some commands. Hyphens take precedence over commas. Table 1 shows examples of how to designate ports and port ranges. page 2-vii Accessing Command Help. 3/1 denotes module 3. page 2-viii Switch CLI Command Modes The switch CLI supports two modes of operation: normal and privileged. The supervisor engine is module 1. the command syntax is mod/port. 7.3 and 6. To designate a specific port on a specific module. port. If your switch has a redundant supervisor engine. the supervisor engines reside in slots 1 and 2. Both modes are password protected. IP Addresses.

Table 2-3 Command-Line Editing Keyboard Shortcuts Keystroke Ctrl-A Ctrl-B or the left arrow key Ctrl-C Function Jumps to the first character of the command line. Table 2-2 Designating VLANs and VLAN Ranges Example 10 5. a single number associated with the VLAN. you can use DNS host names in place of IP addresses. IP Addresses. except for commands that define the IP address or IP alias. To specify a list of VLANs. If DNS is configured on the switch.5/4.4 2-6 78-13315-02 . For information on using IP aliases.Chapter 2 Catalyst Command-Line Interface Command-Line Interfaces Table 2-1 Designating Ports and Port Ranges (continued) Example 5/2. you can use IP aliases in place of the dotted decimal IP address. use a comma-separated list (do not insert spaces) to specify individual VLANs or a hyphen (-) between the VLAN numbers to specify a range of VLANs. Table 3 lists the keyboard shortcuts to use when entering and editing switch commands. “Configuring DNS. see the “Defining IP Aliases” section on page 20-6. Table 2 shows examples of how to designate VLANs and VLAN ranges.4/8 Function Specifies ports 2 and 4 on module 5 and port 10 on module 6 Specifies ports 1 and 2 on module 3 and port 8 on module 4 VLANs are identified using the VLAN ID. 10.” Command Line Editing You can scroll through the last 20 commands stored in the history buffer.15 10-50. written as 4 octets separated by periods (dotted decimal format) that are made up of a network section.54.2. IP address. as shown in the following example: 126. This is true for most commands that use an IP address. and IP Aliases Some commands require a MAC address.1 If you have configured IP aliases on the switch. Escapes and terminates prompts and tasks.500 Function Specifies VLAN 10 Specifies VLANs 5.3 and 6. an optional subnet section.10. see Chapter 28. which must be designated in a standard format.6/10 3/1-2. as shown in the following example: 00-00-0c-24-d2-fe The IP address format is 32 bits. and 15 Specifies VLANs 10 through 50. and a host section. or IP alias. and VLAN 500 Designating MAC Addresses. inclusive. For information on configuring DNS. and enter or edit the command at the prompt. Catalyst 6000 Family Software Configuration Guide—Releases 6. Moves the cursor back one character. The MAC address format must be six hexadecimal numbers separated by hyphens.

Add string bbb to the end of the command containing the string aaa.3 and 6. Deletes from the cursor to the end of the command line. Repeat the nnth most recent command. Jumps to the end of the current command line. by using special abbreviated commands. 1. To modify and repeat the most recent command: ^aaa^bbb To add a string to the end of a previous command and repeat it: !!aaa !n aaa !aaa bbb !?aaa bbb Catalyst 6000 Family Software Configuration Guide—Releases 6. Add string aaa to the end of the most recent command. Deletes last word typed. Table 4 lists the history substitution commands. The arrow keys function only on ANSI-compatible terminals such as VT100s. Moves the cursor forward one word. Moves the cursor forward one character.4 78-13315-02 2-7 . Repeats current command line on a new line. Replace the string aaa with the string bbb in the most recent command. Add string bbb to the end of the command beginning with string aaa. reenter command after using this key. Moves the cursor back one word. Ctrl-R Ctrl-N or the down arrow key Ctrl-P or the up arrow key Ctrl-U. Add string aaa to the end of command n.Chapter 2 Command-Line Interfaces Catalyst Command-Line Interface Table 2-3 Command-Line Editing Keyboard Shortcuts (continued) Keystroke Ctrl-D Ctrl-E Ctrl-F or the right arrow key Ctrl-K Ctrl-L. History Substitution The history buffer stores the last 20 commands you entered during a terminal session. Table 2-4 History Substitution Commands Command Repeating recent commands: !! !-nn !n !aaa !?aaa Function Repeat the most recent command. Erases mistake when entering a command. Repeat the command containing the string aaa. Repeat the command beginning with string aaa. Repeat command n. Deletes from the cursor to the beginning of the command line. Ctrl-X Ctrl-W Esc B Esc D Esc F Delete key or Backspace key 1 1 1 Function Deletes the character at the cursor. History substitution allows you to access these commands without retyping them. Deletes from the cursor to the end of the word. Enters previous command line in the history buffer. Enters next command line in the history buffer.

appending help or ? to a command category displays a list of commands in that category. the switch might enter ROM monitor mode if it does not find a valid system image when it is booting. and a variety of protocol-specific modes. The EXEC commands are not saved across reboots of the switch. Catalyst 6000 Family Software Configuration Guide—Releases 6. you must enter privileged EXEC mode.cisco.Chapter 2 MSFC Command-Line Interface Command-Line Interfaces Accessing Command Help Enter help or ? in normal or privileged mode to see the commands available in those modes. Table 5 lists and describes the most commonly used Cisco IOS modes. Only a limited subset of the commands are available in EXEC mode. the help menu. MSFC Command-Line Interface These sections describe the MSFC CLI: • • Cisco IOS Command Modes. To have access to all commands. you must type in a password to access privileged EXEC mode. For more information. which clear counters or interfaces. or if its configuration file is corrupted at startup.com/univercd/cc/td/doc/product/software/ios121/121cgcr/secur_c/scprt1/scdathen. entering help or ? after a command provides additional information. you begin in user mode. parameter ranges are provided if you enter a command using the wrong number of arguments or inappropriate arguments. you can enter interface configuration mode. Command usage. page 2-x Note In addition to the methods described in the “Accessing the MSFC from the Switch” section on page 2-iii. these commands are stored across switch reboots. From global configuration mode. On selected commands. you can type in any EXEC command or access global configuration mode. which show the current configuration status. For more information. Refer to “Configuring Authentication” in the Cisco IOS Security Configuration Guide: http://www. Normally. The configuration modes allow you to make changes to the running configuration.4 2-8 78-13315-02 . see the “ROM-Monitor Command-Line Interface” section on page 2-i. such as a command usage description. The commands available to you depend on which mode you are currently in. From privileged EXEC mode. For example. You must start at global configuration mode. page 2-viii Cisco IOS Command-Line Interface. and when appropriate.htm Cisco IOS Command Modes The Cisco IOS user interface is divided into many different modes. type a question mark (?) at the system prompt. you can configure IOS to support direct Telnet access to the MSFC. To get a list of the commands in a given mode. If you later save the configuration. see the “Getting a List of IOS Commands and Syntax” section on page 2-ix. such as show commands. When you start a session on the switch. and clear commands. Additionally.3 and 6. often called user EXEC mode. ROM monitor mode is a separate mode used when the switch cannot boot properly. subinterface configuration mode. Most of the EXEC commands are one-time commands.

4 78-13315-02 2-9 . Router# co? configure Catalyst 6000 Family Software Configuration Guide—Releases 6. enter the line console 0 command. From global configuration mode. you can get a list of available commands by entering a question mark (?). Router# Global configuration From the privileged EXEC mode. use this configuration mode to configure the console interface. When you type exit. You can abbreviate commands and keywords by entering just enough characters to make the command unique from other commands. and display system information. Router(config-line)# The Cisco IOS command interpreter. Configure features that affect the system as a whole. press Ctrl-Z. Set operating parameters. interprets and executes the commands you enter. you can abbreviate the show command to sh and the configure terminal command to config t. the switch backs out one level. Many features are enabled for a particular interface.Chapter 2 Command-Line Interfaces MSFC Command-Line Interface Table 2-5 Frequently Used IOS Command Modes Mode User EXEC Description of Use Connect to remote devices. How to Access Log in. From the directly connected console or the virtual terminal used with Telnet. Do not include a space. perform basic tests. The privileged command set includes the commands in user EXEC mode as well as the configure command.3 and 6. This form of help is called word help. enter the enable command and the enable password. Router(config)# Interface configuration Router(config-if)# Console configuration From global configuration mode. enter the interface type location command. Prompt Router> Privileged EXEC (enable) From the user EXEC mode. change terminal settings on a temporary basis. type in those characters followed by the question mark (?). because it completes a word for you. Use this command to access the other command modes. Getting a List of IOS Commands and Syntax In any command mode. To exit configuration mode completely and return to privileged EXEC mode. called the EXEC. Router> ? To obtain a list of commands that begin with a particular character sequence. Interface commands enable or modify the operation of a Gigabit Ethernet or Fast Ethernet interface. For example. enter the configure terminal command.

page 2-x Viewing and Saving the Cisco IOS Configuration.3 and 6. perform this task: Note Enter the switch console command to access the MSFC from the switch CLI when directly connected to the supervisor engine console port. press the up-arrow key or Ctrl-P. To access the MSFC from a Telnet session. Tip If you are having trouble entering a command.Chapter 2 MSFC Command-Line Interface Command-Line Interfaces To list keywords or arguments. and enter the question mark (?) for a list of available commands.4 2-10 78-13315-02 . enter enable Router> enable mode. Press Ctrl-Z in any mode to immediately return to privileged EXEC mode. enter Console> switch console [mod] the MSFC CLI. Router# configure ? memory network overwrite-network terminal Configure Configure Overwrite Configure from NV memory from a TFTP network host NV memory from TFTP network host from the terminal To redisplay a command you previously entered. At the privileged EXEC prompt. check the system prompt. At the EXEC prompt. Enter exit to return to the previous mode. enter global configuration mode. page 2-xi Accessing Cisco IOS Configuration Mode To access the Cisco IOS configuration mode. page 2-xi Bringing Up an MSFC Interface. This form of help is called command syntax help. enter a question mark in place of a keyword or argument. You might be in the wrong command mode or using incorrect syntax. and arguments you have already entered. because it reminds you which keywords or arguments are applicable based on the command. Cisco IOS Command-Line Interface These sections describe basic Cisco IOS configuration tasks you need to understand before you configure routing: • • • Accessing Cisco IOS Configuration Mode. Router# configure terminal Catalyst 6000 Family Software Configuration Guide—Releases 6. see the “Accessing the MSFC from a Telnet Session” section on page 2-iv. You can continue to press the up-arrow key to see the last 20 commands you entered. keywords. Task Step 1 Step 2 Step 3 Command If you are in the switch CLI. Include a space before the question mark.

Exit configuration mode.4 78-13315-02 2-11 . Exit configuration mode. View the configuration in NVRAM. the matching VLAN interface on the redundant MSFC will stop forwarding packets. an MSFC interface might be administratively shut down. Save the current configuration to NVRAM. you should manually shut down the matching interface on the redundant MSFC. Therefore. Bring the interface up. perform this task in privileged mode: Task Command Router(config)# interface interface_type interface_num Router(config-if)# no shutdown Router(config-if)# Ctrl-Z Step 1 Step 2 Step 3 Specify the interface to bring up.) Router(config)# Ctrl-Z Enter the commands to configure routing. To bring up an MSFC interface that is administratively shut down. Step 2 Step 3 Router# show startup-config Router# copy running-config startup-config Bringing Up an MSFC Interface In some cases. Viewing and Saving the Cisco IOS Configuration To view and save the configuration after you make changes. You can check the status of an interface using the show interface command.Chapter 2 Command-Line Interfaces MSFC Command-Line Interface Task Step 4 Step 5 Command (Refer to the appropriate configuration tasks later in this chapter. Note In a redundant supervisor engine setup. Catalyst 6000 Family Software Configuration Guide—Releases 6. perform this task: Task Step 1 Command Router# show running-config View the current operating configuration at the privileged EXEC prompt. if an interface on one MSFC is shut down.3 and 6.

Chapter 2 MSFC Command-Line Interface Command-Line Interfaces Catalyst 6000 Family Software Configuration Guide—Releases 6.4 2-12 78-13315-02 .3 and 6.

4 78-13315-02 3-1 . This chapter consists of these sections: • • • • • • • • • • Understanding the Switch Management Interfaces. refer to the Catalyst 6000 Family Command Reference publication. such as spanning tree. page 3-ii Preparing to Configure the IP Address and Default Gateway. page 3-v Configuring Default Gateways. the in-band (sc0) interface and the Serial Line Internet Protocol (SLIP) (sl0) interface. DHCP. and so forth. VLAN membership. or RARP to Obtain an IP Address. Note For complete syntax and usage information for the commands used in this chapter. page 3-ix Renewing and Releasing a DHCP-Assigned IP Address. Catalyst 6000 Family Software Configuration Guide—Releases 6. The in-band (sc0) management interface is connected to the switching fabric and participates in all of the functions of a normal switch port. Cisco Discovery Protocol (CDP). page 3-x Understanding the Switch Management Interfaces Catalyst 6000 family switches have two configurable IP management interfaces. page 3-vii Using BOOTP. and default gateway on the Catalyst 6000 family switches. page 3-v Assigning the In-Band (sc0) Interface IP Address. page 3-iv Default IP Address and Default Gateway Configuration. page 3-vi Configuring the SLIP (sl0) Interface on the Console Port. The out-of-band management interface (sl0) is not connected to the switching fabric and does not participate in any of these functions.3 and 6. page 3-iv Booting the MSFC for the First Time.C H A P T E R 3 Configuring the Switch IP Address and Default Gateway This chapter describes how to configure the IP address. subnet mask. page 3-i Understanding Automatic IP Configuration.

a Telnet session opened from the switch to a host) is forwarded according to the entries in the switch IP routing table. Understanding Automatic IP Configuration These sections describe how the switch can obtain its IP configuration automatically: • • • Automatic IP Configuration Overview. “Modifying the Switch Boot Configuration. For more information about the CONFIG_FILE environment variable. The switch must request another IP address. see Chapter 23.Chapter 3 Understanding Automatic IP Configuration Configuring the Switch IP Address and Default Gateway When you configure the IP address. DHCP. This address is the default for a new switch or a switch whose configuration file has been cleared using the clear config all command. and RARP requests. and VLAN membership of the sc0 interface. The switch IP routing table is used to forward traffic originating on the switch only. you must configure at least one default gateway for the sc0 interface. DHCP. For intersubnetwork communication to occur.0. not for forwarding traffic sent by devices connected to the switch. Automatic allocation—The switch obtains an IP address when it first contacts the DHCP server. Dynamic allocation—The switch obtains a “leased” IP address for a specified period of time. and RARP requests only if the sc0 interface IP address is set to 0.” Understanding How DHCP Works There are three methods for obtaining an IP address from the DHCP server: • • • Manual allocation—The network administrator maps the switch MAC address to an IP address at the DHCP server. you can access the switch through Telnet or Simple Network Management Protocol (SNMP). page 3-ii Understanding How DHCP Works. and the switch surrenders the address. subnet mask. All IP traffic generated by the switch itself (for example. page 3-ii Understanding How BOOTP and RARP Work.0 when the switch boots up. The IP address is revoked at the end of this period. The address is permanently assigned to the switch. Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4 3-2 78-13315-02 . you can open a point-to-point connection to the switch through the console port from a workstation. Note If the CONFIG_FILE environment variable is set. all configuration files are processed before the switch determines whether to broadcast BOOTP. broadcast address. When you configure the SLIP (sl0) interface.0. and RARP requests are only broadcast out the sc0 interface. DHCP. page 3-iii Automatic IP Configuration Overview The switch can obtain its IP configuration automatically using one of the following protocols: • • • Bootstrap Protocol (BOOTP) Dynamic Host Configuration Protocol (DHCP) Reverse Address Resolution Protocol (RARP) The switch makes BOOTP. BOOTP.

Table 3-1 Supported DHCP Options Code 1 2 3 6 12 15 28 33 42 51 52 61 66 Option Subnet mask Time offset Router Domain name server Host name Domain name Broadcast address Static route NTP servers IP address lease time Option overload Client-identifier TFTP server name If a BOOTP response is received from a BOOTP server. Catalyst 6000 Family Software Configuration Guide—Releases 6. Other options specified in the DHCPOFFER message are ignored. and default gateway address.Chapter 3 Configuring the Switch IP Address and Default Gateway Understanding Automatic IP Configuration In addition to the sc0 interface IP address. If a response is received. the switch processes all supported options contained in the message. The switch broadcasts a DHCPDISCOVER message one to ten seconds after all of the switch ports are online. The switch retrieves its IP address from the server automatically when it boots up.0. you map the switch MAC address to an IP address on the BOOTP or RARP server. the switch can obtain the subnet mask.4 78-13315-02 3-3 . If a DHCPOFFER message is received from a DCHP server. the information learned from DHCP or BOOTP is retained. the sc0 interface IP address remains set to 0. The switch broadcasts 10 BOOTP and RARP requests after all of the switch ports are online. the switch sets the in-band (sc0) interface IP address to the address specified in the response. broadcast address.or BOOTP-obtained IP address. If no reply is received. If no DHCPOFFER message or BOOTP response is received in reply. If no response is received after ten minutes. DHCP-learned values are not used if user-configured values are present.0 (provided that BOOTP and RARP requests fail as well). Table 1 shows the supported DHCP options. If you reset or power cycle a switch with a DHCP. Understanding How BOOTP and RARP Work With BOOTP and RARP. the switch retains the current IP address. the switch sets the in-band (sc0) interface IP address to the address specified in the BOOTP response.3 and 6.0. If a DHCP or Bootstrap Protocol (BOOTP) server responds to the request. the switch attempts to renew the lease on the IP address. At bootup. The switch always requests an infinite lease time in the DHCPDISCOVER message. the switch takes appropriate action. the switch rebroadcasts the request using an exponential backoff algorithm (the amount of time between requests increases exponentially).

The boot loader image must stay on the MSFC bootflash. which then boots the system image from the bootflash. Note Before you can use a system image stored on the supervisor engine Flash PC card. you must set the BOOTLDR environment variable. the MSFC is configured to boot the boot loader image first. Preparing to Configure the IP Address and Default Gateway Before you configure the switch IP address and default gateway. the sc0 interface IP address remains set to 0. as appropriate: • • • • • • IP address for the switch (sc0 interface only) Subnet mask/number of subnet bits (sc0 interface only) (Optional) Broadcast address (sc0 interface only) VLAN membership (sc0 interface only) SLIP and SLIP destination addresses (sl0 interface only) Interface connection type – In-band (sc0) interface: Configure this interface when assigning an IP address. The system image is the main Cisco IOS software image with full multiprotocol routing support. Caution Do not erase the boot loader image.Chapter 3 Preparing to Configure the IP Address and Default Gateway Configuring the Switch IP Address and Default Gateway If no reply is received.0 (provided that DHCP requests fail as well). if a Flash PC card is available on the supervisor engine. Booting the MSFC for the First Time Two Multilayer Switch Feature Card (MSFC) images are provided on the MSFC bootflash: a boot loader image and a system image. obtain the following information. and VLAN to the in-band management interface on the switch. you need to change the configuration on the MSFC to boot the MSFC from the appropriate image on the Flash PC card by adding the following command to the MSFC configuration: boot sup-slot0:system_image In the above example. this image must always remain as the first image on the MSFC bootflash as it is always used as the first image to boot. system_image is the name of the desired image on the supervisor Flash PC card. subnet mask. If you reset or power cycle a switch with a BOOTP or RARP-obtained IP address.0. However.0. Catalyst 6000 Family Software Configuration Guide—Releases 6.4 3-4 78-13315-02 . – SLIP (sl0) interface: Configure this interface when setting up a point-to-point SLIP connection between a terminal and the switch. As shipped.3 and 6. To store the system image on the supervisor Flash PC card. enter the boot bootldr bootflash:boot_loader_image command. we recommend that you store all new system images (upgrades) on the supervisor engine Flash PC card instead of the bootflash on the MSFC. In privileged mode. the information learned from BOOTP or RARP is retained. The boot loader image is a limited function system image that has network interface code and end-host protocol code.

SLIP=Serial Line Internet Protocol Assigning the In-Band (sc0) Interface IP Address Before you can Telnet to the switch or use SNMP to manage the switch. and broadcast address set to 0. you must assign an IP address to the in-band (sc0) logical interface. at least one VLAN interface must be configured and active. If desired. If necessary. Table 3-2 Switch IP Address and Default Gateway Default Configuration Feature In-band (sc0) interface Default gateway address SLIP (sl0) interface 1 Default Value • • IP address. there is really no need to store new system images on the bootflash. By following this recommendation. and (optional) broadcast address to the in-band (sc0) interface.0.3 and 6. subnet mask (or number of set interface sc0 [ip_addr[/netmask] [broadcast]] subnet bits). you can update the system image on the bootflash from an image on the supervisor engine Flash PC card by entering these commands: delete bootflash:old_system_image squeeze bootflash: copy sup-slot0:new_system_image bootflash: Default IP Address and Default Gateway Configuration Table 2 shows the default IP address and default gateway configuration.0.0.0 SLIP for the console port is not active (set to detach) Set to 0.0.0.0 with a metric of 0 • • 1.4 78-13315-02 3-5 . To set the IP address and VLAN membership of the in-band (sc0) management interface.0. perform this task in privileged mode: Task Step 1 Command Assign an IP address. subnet mask. set interface sc0 up show interface Step 2 Step 3 Step 4 Catalyst 6000 Family Software Configuration Guide—Releases 6. bring the interface up. Assign the in-band interface to the proper VLAN set interface sc0 [vlan] (make sure the VLAN is associated with the network to which the IP address belongs). Verify the interface configuration. You can specify the subnet mask (netmask) using the number of subnet bits or using the subnet mask in dotted decimal format.0 Assigned to VLAN 1 IP address and SLIP destination address set to 0.Chapter 3 Configuring the Switch IP Address and Default Gateway Default IP Address and Default Gateway Configuration Note To boot a system image stored on the supervisor engine Flash PC card.

If you do not specify a primary default gateway.52. Use the primary keyword to make a gateway the primary gateway. If more than one gateway is designated as primary. specify the subnet mask in dotted decimal format.124/29 Interface sc0 IP address and netmask set.255. The switch sends all off-network IP traffic to the primary default gateway. The switch sends periodic ping messages to determine whether each default gateway is up or down.255. and specify the VLAN assignment for the in-band (sc0) interface: Console> (enable) set interface sc0 172. the switch forwards only IP traffic generated by the switch itself (for example.124/255. assign an IP address. a router interface in the same network or subnet as the switch IP address).52. show ip route Catalyst 6000 Family Software Configuration Guide—Releases 6. see the “Configuring Static Routes” section on page 20-7. you might want to configure static IP routes in addition to default gateways.20.52. If connectivity to the primary gateway is lost. and verify the configuration: Console> (enable) set interface sc0 5 172. The switch does not use the IP routing table to forward traffic from connected devices.20. If connectivity to the primary gateway is restored. IP address and netmask set.0. Note In some cases.3 and 6.248 Interface sc0 vlan set. the last primary gateway configured is the primary default gateway.0.20. For information on configuring static routes.20.0. perform this task in privileged mode: Task Command set ip route default gateway [metric] [primary] Step 1 Step 2 Step 3 Configure a default IP gateway address for the switch.255. specify the number of subnet bits. To configure one or more default gateways.POINTOPOINT.248 broadcast 172.124 netmask 255. You can define up to three default IP gateways. Telnet.0 sc0: flags=63<UP. (Optional) Configure additional default gateways set ip route default gateway [metric] [primary] for the switch. the switch resumes sending traffic to the primary gateway.52.Chapter 3 Configuring Default Gateways Configuring the Switch IP Address and Default Gateway This example shows how to assign an IP address.BROADCAST. Console> (enable) show interface sl0: flags=51<UP. Console> (enable) set interface sc0 5 Interface sc0 vlan set. the switch attempts to use the backup gateways in the order they were configured.255.4 3-6 78-13315-02 .RUNNING> slip 0. Console> (enable) This example shows how to specify the VLAN assignment. Verify that the default gateways appear correctly in the IP routing table.17 Console> (enable) Configuring Default Gateways The supervisor engine sends IP packets destined for other IP subnets to the default gateway (typically.0 dest 0. the first gateway configured is the primary gateway.RUNNING> vlan 5 inet 172.0. and ping). TFTP.

1.1. If you are connected to the switch CLI through the console port and you enter the slip attach command.1.1. Caution You must use the console port for the SLIP connection.1.20 Route added. Catalyst 6000 Family Software Configuration Guide—Releases 6. an EIA/TIA-232 terminal cannot connect through the console port. enter privileged mode.4 78-13315-02 3-7 . and enter the slip detach command to restore the console port connection. you will lose the console port connection.20 default 10.1 primary Route added.1.1.1.1 default 10. To enable and attach SLIP on the console port.10 10. Command clear ip route default gateway clear ip route all This example shows how to configure three default gateways on the switch and how to verify the default gateway configuration: Console> (enable) set ip route default 10.3 and 6. Clear all default gateways and static routes. Set the console port SLIP address and the destination address of the attached host. Use Telnet to access the switch. When the SLIP connection is enabled and SLIP is attached on the console port. Verify the SLIP interface configuration.1. perform this task: Task Command enable set interface sl0 slip_addr dest_addr show interface slip attach Step 1 Step 2 Step 3 Step 4 Step 5 Access the switch from a remote host with Telnet. telnet {host_name | ip_addr} Enter privileged mode on the switch.1. Enable SLIP for the console port.--------------default 10.0.1 Destination Gateway --------------.Chapter 3 Configuring the Switch IP Address and Default Gateway Configuring the SLIP (sl0) Interface on the Console Port To remove default gateway entries.1. Console> (enable) show ip route Fragmentation Redirect Unreachable -----------------------------enabled enabled enabled The primary gateway: 10.1. Console> (enable) set ip route default 10.100 default default Console> (enable) RouteMask ---------0x0 0x0 0x0 0xff000000 0xff000000 Flags ----UG G G U UH Use -------6 0 0 75 0 Interface --------sc0 sc0 sc0 sc0 sl0 Configuring the SLIP (sl0) Interface on the Console Port Use the SLIP (sl0) interface for point-to-point SLIP connections between the switch and an IP host.0. Console> (enable) set ip route default 10. perform one of these tasks in privileged mode: Task Clear an individual default gateway entry.1.1.1.0 10.1.10 Route added.

1. Console Enter password: Console> enable Enter password: Console> (enable) set interface sl0 10.20.Chapter 3 Configuring the SLIP (sl0) Interface on the Console Port Configuring the Switch IP Address and Default Gateway To disable SLIP on the console port.20.POINTOPOINT.1 dest 10.38 netmask 255. Connected to 172.52.1.255.52.52.20. Console> (enable) show interface sl0: flags=51<UP.1.3 and 6.7 Console> (enable) slip attach Console Port now running SLIP. Console> (enable) slip detach SLIP detached on Console port..4 3-8 78-13315-02 .2 Interface sl0 slip and destination address set. telnet {host_name | ip_addr} Enter privileged mode on the switch.255.RUNNING> slip 10. Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.20.38 Trying 172.1.BROADCAST.20..1. Cisco Systems. perform this task: Task Step 1 Step 2 Step 3 Command enable slip detach Access the switch from a remote host with Telnet.1.38 .38.2 sc0: flags=63<UP.RUNNING> vlan 522 inet 172.1.52. This example shows how to configure SLIP on the console port and verify the configuration: sparc20% telnet 172.52.1 10. Inc. Disable SLIP for the console port. Escape character is '^]'.240 broadcast 172.1.

0. (With DHCP.0. Reset the switch. DHCP.25. DHCP.32 added to DNS server table as backup server.254 Catalyst 6000 Family Software Configuration Guide—Releases 6. The switch broadcasts DHCP and RARP requests only when the switch boots up. DHCP.16.20. or RARP server configuration.Chapter 3 Configuring the Switch IP Address and Default Gateway Using BOOTP.252 added %MGMT-5-DHCP_S:Assigned IP address 172. offset from UTC is 7 hours 58 minutes Timezone set to ''.16. subnet mask. Obtain the last address in the MAC address range show module for module 1 (the supervisor engine). or RARP server on the network.32 added to DNS server table as primary server. confirm that other options (such as the show ip route default gateway address) are set correctly. or RARP to obtain an IP address for the switch.25.32. receiving a DHCP offer. offset from UTC is 7 hours 58 minutes 172.0.3 and 6. This example shows the switch broadcasting a DHCP request. 172. this step is necessary only if using the manual or automatic allocation methods. perform this task: Task Command — Step 1 Step 2 Make sure that there is a DHCP. (With DHCP.20. This address is displayed under the MAC-Address(es) heading.25.0.244 from DHCP Server 172.31. or RARP to Obtain an IP Address Note For complete information on how the switch uses BOOTP.25. NTP server 172. confirm that the sc0 interface IP address.4 78-13315-02 3-9 . mapping the MAC address of the switch to the IP configuration information for the switch. set interface sc0 0.30. DHCP. 172. To use BOOTP. this step is necessary only if using the manual allocation method. When the switch reboots. or RARP to Obtain an IP Address Using BOOTP. BOOTP.253 added NTP server 172.0 reset system Step 3 Step 4 Step 5 Step 6 show interface Step 7 For DHCP. BOOTP. or RARP to obtain its IP configuration. and broadcast address are set correctly. and configuring the IP address and other IP parameters according to the contents of the DHCP offer: Console> (enable) Sending RARP request with address 00:90:0c:5a:8f:ff Sending DHCP packet with address: 00:90:0c:5a:8f:ff dhcpoffer Sending DHCP packet with address: 00:90:0c:5a:8f:ff Timezone set to ''.16.16.32 added to DNS server table as backup server.) Set the sc0 interface IP address to 0.) — Add an entry for each switch in the DHCP.0.16. see the “Understanding Automatic IP Configuration” section on page 3-ii.

255.3 and 6...0.0. set interface sc0 dhcp release This example shows how to renew the lease on a DHCP-assigned IP address: Console> (enable) set interface sc0 dhcp renew Renewing IP address.RUNNING> slip 0. set interface sc0 dhcp renew Release the lease on a DHCP-assigned IP address.POINTOPOINT.25.RUNNING> vlan 1 inet 172..output truncated.244 netmask 255.254 Console> Renewing and Releasing a DHCP-Assigned IP Address If you are using DHCP for IP address assignment.4 3-10 78-13315-02 .25.0 sc0: flags=63<UP..0 broadcast 172.Chapter 3 Renewing and Releasing a DHCP-Assigned IP Address Configuring the Switch IP Address and Default Gateway Console> (enable) show interface sl0: flags=51<UP.20.255 dhcp server: 172. you can perform either of these DHCP-related tasks: • • Renew the lease on a DHCP-assigned IP address Release the lease on a DHCP-assigned IP address To renew or release a DHCP-assigned IP address on the in-band (sc0) management interface.BROADCAST. perform one of these tasks in privileged mode: Task Command Renew the lease on a DHCP-assigned IP address. Console> (enable) Sending DHCP packet with address: 00:90:0c:5a:8f:ff Done Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.20. Console> (enable) Sending DHCP packet with address: 00:90:0c:5a:8f:ff <..20..25.0.0.> This example shows how to release the lease on a DHCP-assigned IP address: Console> (enable) set interface sc0 dhcp release Releasing IP address..0 dest 0..255.

Fast Ethernet. The configuration tasks in this chapter apply to Ethernet.C H A P T E R 4 Configuring Ethernet. Catalyst 6000 family switches solve congestion problems caused by high-bandwidth devices and a large number of users by assigning each device (for example. Because each Ethernet port on the switch represents a separate Ethernet segment. Note For complete syntax and usage information for the commands used in this chapter. and Gigabit Ethernet switching on the Catalyst 6000 family switches. Fast Ethernet. Gigabit Ethernet ports on Catalyst 6000 family switches are full duplex only (2-Gbps effective bandwidth). Fast Ethernet.or 100-Mbps port on a Catalyst 6000 family switch (Gigabit Ethernet ports are always full duplex). Because collisions are a major bottleneck in Ethernet networks. Normally. which means that stations can either receive or transmit. Fast Ethernet. a server) to its own 10-. Catalyst 6000 Family Software Configuration Guide—Releases 6. This chapter consists of these sections: • • • Understanding How Ethernet Works. Ethernet operates in half-duplex mode. 100-. and Gigabit Ethernet switching modules. In full-duplex mode. or 1000-Mbps segment. page 4-iii Setting the Port Configuration. an effective solution is full-duplex communication. two stations can transmit and receive at the same time. parallel connections between Ethernet segments. effective Ethernet bandwidth doubles to 20 Mbps for 10-Mbps ports and to 200 Mbps for Fast Ethernet ports. as well as to the uplink ports on the supervisor engine. Switched connections between Ethernet segments last only for the duration of the packet. servers in a properly configured switched environment achieve full access to the bandwidth. When packets can flow in both directions simultaneously.3 and 6. page 4-i Default Ethernet.4 78-13315-02 4-1 . refer to the Catalyst 6000 Family Command Reference publication. and Gigabit Ethernet Configuration. New connections can be made between different segments for the next packet. and Gigabit Ethernet Switching This chapter describes how to use the command-line interface (CLI) to configure Ethernet. page 4-iv Understanding How Ethernet Works Catalyst 6000 family switches support simultaneous. which is an option for any 10.

the switch treats each port as an individual segment. page 4-ii Switching Frames Between Segments Each Ethernet port on a Catalyst 6000 family switch can connect to a single workstation or server. Ports on a typical Ethernet hub all connect to a common backplane within the hub. and Gigabit Ethernet Switching These sections describe Ethernet: • • • Switching Frames Between Segments. and the bandwidth of the network is shared by all devices attached to the hub. You cannot disable port negotiation with the set port speed command. the switch maintains an address table.Chapter 4 Understanding How Ethernet Works Configuring Ethernet. page 4-ii Understanding How Port Negotiation Works. it is removed from the address table. it floods the frame to all ports of the same VLAN except the port that received the frame. it associates the MAC address of the sending station with the port on which it was received. The address table can store at least 32K address entries without flooding any entries. remote fault information. Configure port negotiation with the set port negotiation command. The ports on both ends of a link must have the same setting. Catalyst 6000 Family Software Configuration Guide—Releases 6. When a frame enters the switch. If two stations establish a session that uses a significant level of bandwidth. The switch then forwards subsequent frames to a single port without flooding to all ports. Port negotiation exchanges flow-control parameters. Building the Address Table Catalyst 6000 family switches build the address table by using the source address of the frames received. The switch uses an aging mechanism. so if an address remains inactive for a specified number of seconds. Understanding How Port Negotiation Works Note Port negotiation does not involve negotiating port speed. defined by a configurable aging timer. the network performance of all other stations attached to the hub is degraded. The link will not come up if the ports at each end of the link are set inconsistently (port negotiation enabled on one port and disabled on the other). To switch frames between ports efficiently. or to a hub through which workstations or servers connect to the network. When the switch receives a frame for a destination address not listed in its address table. Fast Ethernet.4 4-2 78-13315-02 . When the destination station replies. Port negotiation is enabled by default. To reduce degradation.3 and 6. the switch adds its relevant source address and port ID to the address table. page 4-ii Building the Address Table. When stations on different ports need to communicate. the switch forwards frames from one port to the other at wire speed to ensure that each session receives full bandwidth. and duplex information.

and Gigabit Ethernet Configuration Table 2 shows the Ethernet. Fast Ethernet.3 and 6.Chapter 4 Configuring Ethernet. and Gigabit Ethernet Switching Default Ethernet. Fast Ethernet. Fast Ethernet.4 78-13315-02 4-3 . Table 4-2 Ethernet Default Configuration Feature Port enable state Port name Duplex mode Default Value All ports are enabled None • • • • Half duplex for 10-Mbps Ethernet ports Autonegotiate speed and duplex for 10/100-Mbps Fast Ethernet ports Autonegotiate duplex for 100-Mbps Fast Ethernet ports Full duplex for 1000-Mbps Gigabit Ethernet ports Flow control (Gigabit Ethernet) Flow control set to off for receive (Rx) and desired for transmit (Tx) Flow control (other Ethernet) Spanning Tree Protocol (STP) Native VLAN Port VLAN cost Flow control set to off for receive (Rx). and Gigabit Ethernet Configuration Table 1 shows the four possible port negotiation configurations and the resulting link status for each configuration. Fast Ethernet. transmit (Tx) not supported Enabled for VLAN 1 VLAN 1 • • • • Port VLAN cost of 100 for 10-Mbps Ethernet ports Port VLAN cost of 19 for 10/100-Mbps Fast Ethernet ports Port VLAN cost of 19 for 100-Mbps Fast Ethernet ports Port VLAN cost of 4 for 1000-Mbps Gigabit Ethernet ports EtherChannel Jumbo frames Disabled on all Ethernet ports Disabled on all Ethernet ports Catalyst 6000 Family Software Configuration Guide—Releases 6. 2. Near End refers to the local port. Far End refers to the port at the other end of the link. Table 4-1 Port Negotiation Configuration and Possible Link Status Port Negotiation State Near End Off On Off On 1 Link Status Far End Off On On Off 2 Near End Up Up Up Down Far End Up Up Down Up 1. Default Ethernet. and Gigabit Ethernet default configuration.

-----------------.. Fast Ethernet. and Gigabit Ethernet Switching Setting the Port Configuration These sections describe how to configure Ethernet. page 4-iv Setting the Port Speed.3 and 6. page 4-v Setting the Port Duplex Mode.> Last-Time-Cleared -------------------------Wed Jun 16 1999. page 4-vii Changing the Default Port Enable State.-----------full 1000 1000BaseSX full 1000 1000BaseSX Catalyst 6000 Family Software Configuration Guide—Releases 6. Console> (enable) show port 1 Port Name Status ----. perform this task in privileged mode: Task Step 1 Step 2 Command set port name mod/port [name_string] show port [mod[/port]] Set a port name. Fast Ethernet. page 4-ix Configuring the Jumbo Frame Feature. Console> (enable) set port name 1/2 Port 1/2 name set. 16:25:57 Console> (enable) Router Connection Server Link Vlan ---------trunk trunk Duplex Speed Type -----.4 4-4 78-13315-02 . and Gigabit Ethernet switching on the Catalyst 6000 family switches: • • • • • • • • • • Setting the Port Name.----. page 4-vii Setting the Port Debounce Timer. page 4-viii Configuring a Timeout Period for Ports in errdisable State.Chapter 4 Setting the Port Configuration Configuring Ethernet. and Gigabit Ethernet switching modules to facilitate switch administration. Fast Ethernet.---------1/1 Router Connection connected 1/2 Server Link connected <. Verify the port name is configured. page 4-vi Enabling and Disabling Port Negotiation..output truncated.. page 4-xi Checking Connectivity. page 4-v Configuring IEEE 802.3Z Flow Control. This example shows how to set the name for ports 1/1 and 1/2 and how to verify that the port names are configured correctly: Console> (enable) set port name 1/1 Port 1/1 name set.. page 4-xiii Setting the Port Name You can set port names on Ethernet. To set the port name.

both speed and duplex are autonegotiated.Chapter 4 Configuring Ethernet. show port [mod[/port]] This example shows how to set the port speed to 100 Mbps on port 2/2: Console> (enable) set port speed 2/2 100 Port 2/2 speed set to 100 Mbps. Catalyst 6000 Family Software Configuration Guide—Releases 6. You cannot change the duplex mode of autonegotiation ports. and Gigabit Ethernet Switching Setting the Port Configuration Setting the Port Speed You can configure the port speed on 10/100-Mbps Ethernet switching modules. Use the auto keyword to autonegotiate the port’s speed and duplex mode with the neighboring port. Note If the port speed is set to auto on a 10/100-Mbps Ethernet port. Console> (enable) Setting the Port Duplex Mode You can set the port duplex mode to full or half duplex for Ethernet and Fast Ethernet ports. Note If the port speed is set to auto on a 10/100-Mbps Ethernet port. perform this task in privileged mode: Task Command set port duplex mod/port {full | half} show port [mod[/port]] Step 1 Step 2 Set the duplex mode of a port. perform this task in privileged mode: Task Command Step 1 Step 2 Set the port speed of a 10/100-Mbps Fast Ethernet set port speed mod/port {10 | 100 | auto} port.3 and 6. To set the duplex mode of a port. both speed and duplex are autonegotiated. Fast Ethernet.4 78-13315-02 4-5 . You cannot change the duplex mode on Gigabit Ethernet ports. Verify that the duplex mode of the port is configured correctly. To set the port speed for a 10/100-Mbps port. Verify that the speed of the port is configured correctly. Console> (enable) This example shows how to make port 2/1 autonegotiate speed and duplex with the neighboring port: Console> (enable) set port speed 2/1 auto Port 2/1 speed set to auto-sensing mode. Note Gigabit Ethernet is full duplex only.

Chapter 4 Setting the Port Configuration Configuring Ethernet. Enter the set port flow control command to configure flow control on ports. and 10 Mbps) can receive and act upon “pause” packets from other devices. The port does not use flow control. The port uses flow control if the neighboring port uses it and does not use flow control if the neighboring port does not use it. Verify the flow-control configuration. other Ethernet ports use flow control to respond to flow-control requests. To configure flow control. The port sends flow-control frames to the neighboring port. Table 3 lists the set port flowcontrol command keywords and describes their functions. Fast Ethernet. All Ethernet ports (1000 Mbps.3 and 6. Console> (enable) Configuring IEEE 802. 1. The port sends flow-control frames to the port if the neighboring port asks to use flow control. If a Gigabit Ethernet port receive buffer becomes full. 100 Mbps. This example shows how to turn transmit and receive flow control on and how to verify the flow-control configuration: Console> Port 3/1 Console> Port 3/1 (enable) set port flowcontrol 3/1 send on will send flowcontrol to far end.4 4-6 78-13315-02 . Supported only on Gigabit Ethernet ports.3Z Flow Control Gigabit Ethernet ports on the Catalyst 6000 family switches use flow control to inhibit the transmission of packets to the port for a period of time. The port does not send flow-control frames to the neighboring port. perform this task in privileged mode: Task Step 1 Step 2 Command set port flowcontrol mod/port {receive | send} {off | on | desired} show port flowcontrol Set the flow-control parameters. the port transmits a “pause” packet that tells remote ports to delay sending more packets for a specified period of time. (enable) set port flowcontrol 3/1 receive on will require far end to send flow control Catalyst 6000 Family Software Configuration Guide—Releases 6. and Gigabit Ethernet Switching This example shows how to set the duplex mode to half duplex on port 2/1: Console> (enable) set port duplex 2/1 half Port 2/1 set to half-duplex. Table 4-3 Ethernet-Flow Control Keyword Functions Keywords receive on receive desired receive off send on1 send desired1 send off1 Function The port uses flow control dictated by the neighboring port. regardless of whether flow control is requested by the neighboring port.

Fast Ethernet.---------------. Catalyst 6000 Family Software Configuration Guide—Releases 6.---------------2/1 enabled Console> (enable) To disable port negotiation. Verify the port negotiation configuration.3 and 6.4 78-13315-02 4-7 . This example shows how to enable port negotiation and verify the configuration: Console> (enable) set port negotiation 2/1 enable Port 2/1 negotiation enabled Console> (enable) show port negotiation 2/1 Port Link Negotiation ----.Chapter 4 Configuring Ethernet. This example shows how to disable port negotiation and verify the configuration: Console> (enable) set port negotiation 2/1 disable Port 2/1 negotiation disabled Console> (enable) show port negotiation 2/1 Port Link Negotiation ----.---------------3/1 on disagree on disagree 3/2 off off off off 3/3 desired on desired off Console> (enable) RxPause ------0 0 10 TxPause ------0 0 10 Enabling and Disabling Port Negotiation To enable port negotiation. Verify the port negotiation configuration. and Gigabit Ethernet Switching Setting the Port Configuration Console> (enable) show port flowcontrol Port Send-Flowcontrol Receive-Flowcntl Admin Oper Admin Oper ----. perform this task in privileged mode: Task Step 1 Step 2 Command set port negotiation mod/port enable show port negotiation [mod/port] Enable port negotiation. perform this task in privileged mode: Task Step 1 Step 2 Command set port negotiation mod/port disable show port negotiation [mod/port] Disable port negotiation. not just Ethernet. Note This feature is not supported on systems that do not have a chassis ID PROM.---------------2/1 disabled Console> (enable) Changing the Default Port Enable State Note Changing the default port enable state applies to all port types.

This might cause a security and network instability problem. To change the port enable state.3 and 6. The clear config all command does not change the default port status setting on the chassis. Catalyst 6000 Family Software Configuration Guide—Releases 6. This example shows how to change the default port enable state from enabled to disabled: Console> (enable) set default portstatus disable Default port status set to disable. Entering the set default portstatus command puts all ports into a disable state and blocks the traffic flowing through the ports during a configuration loss. When you set the port debounce timer.Chapter 4 Setting the Port Configuration Configuring Ethernet. The clear config all command uses this setting to determine whether ports should be enabled or disabled when returning to default configuration. You can then manually configure the ports back to the enable state. Display the port enable state. the switch delays notifying the main processor of a link change that can decrease traffic loss due to a network outage. and Gigabit Ethernet ports. perform this task in privileged mode: Task Step 1 Step 2 Command set default portstatus {enable | disable} show default Change the port enable state. Fast Ethernet. and Gigabit Ethernet Switching When you enter the clear config all command or in the event of a configuration loss. Console> (enable) This example shows how to display the port enable state: Console> (enable) show default portstatus: disable Console> (enable) Setting the Port Debounce Timer You can set the port debounce timer on a per-port basis for Ethernet. all ports collapse into VLAN 1. Caution Enabling the port debounce timer causes link up and link down detections to be delayed. The default port status configuration is stored on the chassis. resulting in loss of data traffic during the debouncing period.4 4-8 78-13315-02 . This means it is tied to a chassis and not the supervisor engine. The output of the show config command shows the current default port status configuration. This situation might affect the convergence and reconvergence of various Layer 2 and Layer 3 protocols. Fast Ethernet.

Table 4-4 Port Debounce Timer Delay Time Port Type 10BASE-FL ports 10/100BASE-TX ports 100BASE-FX ports 10/100/1000BASE-TX ports 1000BASE-TX ports 1000BASE-FX ports Debounce Timer Disabled 300 milliseconds 300 milliseconds 300 milliseconds 300 milliseconds 300 milliseconds 10 milliseconds Debounce Timer Enabled 3100 milliseconds 3100 milliseconds 3100 milliseconds 3100 milliseconds 3100 milliseconds 100 milliseconds To set the debounce timer on a port. Once a port is in the errdisable state. perform this task in privileged mode: Task Step 1 Step 2 Command set port debounce mod num/port num {enable | disable} show port debounce [mod | mod_num/port_num] Enable the debounce timer for a port. and Gigabit Ethernet Switching Setting the Port Configuration Table 4 lists the time delay that occurs before the switch notifies the main processor of a link change before and after the switch enables the debounce timer.4 78-13315-02 4-9 .--------------2/1 enable 2/2 disable Console> (enable) Configuring a Timeout Period for Ports in errdisable State A port is in errdisable state if it is enabled in NVRAM. Verify that the debounce timer of the port is configured correctly. However. The errdisable timeout feature allows you to configure a timeout period for ports in errdisable state. For example. the port shuts down at runtime.Chapter 4 Configuring Ethernet. because the NVRAM configuration for the port is enabled (you have not disabled the port). Fast Ethernet.3 and 6. the port status is shown as errdisable. you have to reenable it manually. This example shows how to enable the debounce timer on port 2/1: Console> (enable) set port debounce 2/1 enable Link debounce enabled on port 2/1 Console> (enable) This example shows how to display the per-port debounce timer settings: Console> (enable) show port debounce Port Link debounce ----. Catalyst 6000 Family Software Configuration Guide—Releases 6. if UniDirectional Link Detection (UDLD) detects a unidirectional link. the ports are reenabled automatically eliminating the need to reenable all the errdisabled ports manually. but is disabled at runtime by any process.

-----------bpdu-guard Enable channel-misconfig Disable duplex-mismatch Enable udld Enable other Disable Interval: 300 seconds Ports that will be enabled at the next timeout: Port ErrDisable Reason ----. The default interval for enabling a port is 300 seconds.” all ports errdisabled for any reason are enabled for errdisable timeout.4 4-10 78-13315-02 . If you specify “all.----------------3/1 udld 3/8 bpdu-guard 6/5 udld 7/24 duplex-mismatch Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. This example shows how to enable errdisable timeout for BPDU guard causes: Console> (enable) set errdisable-timeout enable bpdu-guard Successfully enabled errdisable-timeout for bpdu-guard.Chapter 4 Setting the Port Configuration Configuring Ethernet. Console> (enable) This example shows how to set the errdisable timeout interval to 450 seconds: Console> (enable) set errdisable-timeout interval 450 Successfully set errdisable timeout to 450 seconds.3 and 6. The allowable interval range is 30 to 86400 seconds (30 seconds to 24 hours). Console> (enable) This example shows how to enable errdisable timeout for all causes: Console> (enable) set errdisable-timeout enable all Successfully enabled errdisable-timeout for all.” If you specify “other. The ports in errdisable state for reasons other than the first four reasons are considered “other.” all ports errdisabled by causes other than the first four reasons are enabled for errdisable timeout. Fast Ethernet. and Gigabit Ethernet Switching A port enters errdisable state for the following reasons (these reasons appear as configuration options with the set errdisable-timeout enable command): • • • • • • Channel misconfiguration Duplex mismatch BPDU port-guard UDLD Other (reasons other than the above) All (apply errdisable timeout to all reasons) You can enable or disable errdisable timeout for each of the above listed reasons. Console> (enable) This example shows how to display the errdisable timeout configuration: Console> (enable) show errdisable-timeout ErrDisable Reason Timeout Status ------------------. The errdisable feature is disabled by default.

The Gigabit Switch Router (GSR) supports routing of jumbo frames. the port can switch large (or jumbo) frames. WS-X6248-TEL. At 10 Mbps and 1000 Mbps the module supports the jumbo frame default of 9216 bytes. Note Occasionally.Chapter 4 Configuring Ethernet. WS-X6248-RJ-45. WS-X6248A-TEL. page 4-xii Configuring the Jumbo Frame Feature on the Supervisor Engine When you enable the jumbo frame feature on a port. and WX-X6348-RJ21V. you might see a “Jumbo frames inconsistent state” message for a port or multiple ports after entering the show port jumbo command. Catalyst 6000 Family Software Configuration Guide—Releases 6. WS-X6248A-RJ-45. WS-X6348-RJ45V. This feature is useful in optimizing server-to-server performance. The Multilayer Switching Feature Card (MSFC) and Multilayer Switch Module (MSM) do not support jumbo frame routing.4 78-13315-02 4-11 . page 4-xi Configuring the Jumbo Frame Feature on MSFC2. To enable the jumbo frame feature on a per-port basis. Note The WS-X6516-GE-TX (10/100/1000) module only supports a maximum of 8092 bytes at the 100 Mbps speed. if jumbo frames are sent to these routers. router performance is significantly degraded. By enabling the jumbo frame feature on a port. WS-X6348-RJ-45. – Trunk ports – EtherChannels • • • • • Jumbo frames are supported on all Optical Services Modules (OSMs). enter the set port jumbo command to reenable the ports. If this occurs. WS-X6148-RJ21V.3 and 6. WS-X6348-RJ-21. The Multilayer Switching Feature Card 2 (MSFC2) supports routing of jumbo frames. The WS-X6548-RJ-21 and WS-X6548-RJ-45 modules use different hardware at the PHY level and support the full jumbo frame default value of 9216 bytes. The default maximum transmission unit (MTU) frame size is 1548 bytes for all Ethernet ports. Fast Ethernet. the MTU size is increased to 9216 bytes. follow these guidelines: • The jumbo frames feature is supported on the following: – Ethernet ports Note The following modules only support a maximum of 8092 bytes: WS-X6148-RJ-45V. Jumbo frames are not supported on ATM modules (WS-X6101-OC12-SMF/MMF). and Gigabit Ethernet Switching Setting the Port Configuration Configuring the Jumbo Frame Feature These sections describe the jumbo frame feature: • • Configuring the Jumbo Frame Feature on the Supervisor Engine.

4 4-12 78-13315-02 . perform this task: Task Step 1 Step 2 Step 3 Command Router(config)# interface vlan vlan_ID Router(config-if)# mtu mtu_size Router# show interface vlan 111 Access VLAN interface configuration mode.3 and 6. To configure the MTU value. Verify the port configuration. This example shows how to disable the jumbo frames feature on a port: Console> (enable) set port jumbo 2/1 disable Jumbo frames disabled on port 2/1 Console> (enable) Configuring the Jumbo Frame Feature on MSFC2 With an MSFC2. Configuring a VLAN interface with an MTU size greater than the default automatically configures all other VLAN interfaces that have an MTU size greater than the default to the newly configured size. Verify the port configuration. Set the MTU size. you can configure the MTU size on VLAN interfaces to support routing of jumbo frames. Fast Ethernet. which is the size supported by the supervisor engine. perform this task in privileged mode: Task Step 1 Step 2 Command set port jumbo mod/port enable show port jumbo Enable jumbo frames. Valid values are from 64 to 17952 bytes. Set the MTU size no larger than 9216. Catalyst 6000 Family Software Configuration Guide—Releases 6.Chapter 4 Setting the Port Configuration Configuring Ethernet.1 Verify the configuration. VLAN interfaces that have not been changed from the default are not affected. This example shows how to enable the jumbo frames feature on a port and verify the configuration: Console> (enable) set port jumbo 2/1 enable Jumbo frames enabled on port 2/1 Console> (enable) show port jumbo Jumbo frames MTU size is 9216 bytes Jumbo frames enabled on port(s) 2/1 To disable the jumbo frames feature on an Ethernet port. perform this task in privileged mode: Task Step 1 Step 2 Command set port jumbo mod/port disable show port jumbo Disable jumbo frames. 1. and Gigabit Ethernet Switching To enable the jumbo frames feature on an Ethernet port. The jumbo frame feature supports only a single larger-than-default MTU size on the switch.

.> Router# Checking Connectivity Use the ping and traceroute commands to test connectivity.31.Output Truncated..16.196. and Gigabit Ethernet Switching Setting the Port Configuration This example shows how to set the MTU size on a VLAN interface and verify the configuration: Router(config)# interface vlan 111 Router(config-if)# mtu 9216 Router(config-if)# end Router# show interface vlan 111 <.192.3 and 6.Output Truncated.Chapter 4 Configuring Ethernet.31.company. 40 byte packets 1 engineering-1..com (173.1. DLY 10 usec.206) 2 ms 1 ms 1 ms 2 engineering-2.com (173.com (173.com (10. To check connectivity out a port.com (10.company.. If the host is unresponsive.1. BW 1000000 Kbit.3) 3 ms * 2 ms Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.2.3). check the IP address and default gateway configured on the switch... traceroute host Step 3 show interface show ip route This example shows how to ping a remote host and how to trace the hop-by-hop path of packets through the network using traceroute: Console> (enable) ping somehost somehost is alive Console> (enable) traceroute somehost traceroute to somehost. Trace the hop-by-hop route of packets from the switch to a remote host located out the port you want to test. <..company.204) 2 ms 3 ms 2 ms 3 gateway_a. perform this task in privileged mode: Task Step 1 Step 2 Command Ping a remote host that is located out the port you ping [-s] host [packet_size] [packet_count] want to test.4 78-13315-02 4-13 .> MTU 9216 bytes.company. 30 hops max.201) 6 ms 3 ms 3 ms 4 somehost.company.2.1.. Fast Ethernet.

3 and 6. Fast Ethernet.Chapter 4 Setting the Port Configuration Configuring Ethernet.4 4-14 78-13315-02 . and Gigabit Ethernet Switching Catalyst 6000 Family Software Configuration Guide—Releases 6.

” Note For complete syntax and usage information for the commands used in this chapter.1Q Trunk Restrictions. page 5-i Trunking Modes and Encapsulation Types.4 78-13315-02 5-1 . page 5-v Example VLAN Trunk Configurations. refer to the Catalyst 6000 Family Command Reference publication. page 5-v Configuring a Trunk Link. Note For complete information on configuring VLANs. see Chapter 11. page 5-xxiv Understanding How VLAN Trunks Work These sections describe how VLAN trunks work on the Catalyst 6000 family switches: • • • Trunking Overview. This chapter consists of these sections: • • • • • Understanding How VLAN Trunks Work. “Configuring VLANs.1Q—802. Trunks carry the traffic of multiple VLANs over a single link and allow you to extend VLANs across an entire network.1Q is an industry-standard trunking encapsulation Catalyst 6000 Family Software Configuration Guide—Releases 6. page 5-ix Disabling VLAN 1 on Trunks. page 5-i Default Trunk Configuration. page 5-ii 802.3 and 6.C H A P T E R 5 Configuring Ethernet VLAN Trunks This chapter describes how to configure Ethernet VLAN trunks on the Catalyst 6000 family switches. Two trunking encapsulations are available on all Ethernet ports: • • Inter-Switch Link (ISL)—ISL is a Cisco-proprietary trunking encapsulation IEEE 802. page 5-iv Trunking Overview A trunk is a point-to-point link between one or more Ethernet switch ports and another networking device such as a router or a switch.

For more information on VTP domains. The trunking mode. The port becomes a trunk port even if the neighboring port does not agree to the change. For more information about EtherChannel.Chapter 5 Understanding How VLAN Trunks Work Configuring Ethernet VLAN Trunks You can configure a trunk on a single Ethernet port or on an EtherChannel bundle. and the hardware capabilities of the two connected ports determine whether a trunk link comes up and the type of trunk the link becomes. This is the default mode for all Ethernet ports.1Q encapsulation on the trunk link.” Ethernet trunk ports support five different trunking modes (see Table 1). The port becomes a nontrunk port even if the neighboring port does not agree to the change. Catalyst 6000 Family Software Configuration Guide—Releases 6. see Chapter 10.1Q trunk. Puts the port into permanent trunking mode but prevents the port from generating DTP frames. see Chapter 6. or whether the encapsulation type will be autonegotiated. Table 2 lists the encapsulation types used with the set trunk command and describes how they function on Ethernet ports.” Trunk negotiation is managed by the Dynamic Trunking Protocol (DTP). Table 5-1 Ethernet Trunking Modes Mode on off desirable auto nonegotiate Function Puts the port into permanent trunking mode and negotiates to convert the link into a trunk link. DTP supports autonegotiation of both ISL and 802. For trunking to be autonegotiated. depending on the configuration and capabilities of the neighboring port. However. Makes the port willing to convert the link to a trunk link. You must configure the neighboring port manually as a trunk port to establish a trunk link. desirable. Specifies that the port negotiate with the neighboring port to become an ISL (preferred) or 802. “Configuring EtherChannel. you can use the on or nonegotiate mode to force a port to become a trunk. you can specify whether the trunk will use ISL encapsulation. Table 3 shows the result of the possible trunking configurations. Trunking Modes and Encapsulation Types Table 1 lists the trunking modes used with the set trunk command and describes how they function on Fast Ethernet and Gigabit Ethernet ports.3 and 6. Specifies 802.1Q encapsulation. “Configuring VTP. You can use the show port capabilities command to determine which encapsulation types a particular port supports. Makes the port actively attempt to convert the link to a trunk link.1Q trunks. In addition. Puts the port into permanent nontrunking mode and negotiates to convert the link into a nontrunk link. the ports must be in the same VLAN Trunking Protocol (VTP) domain.4 5-2 78-13315-02 . the trunk encapsulation type. even if it is in a different domain. or auto mode. Table 5-2 Ethernet Trunk Encapsulation Types Encapsulation isl dot1q negotiate Function Specifies ISL encapsulation on the trunk link. The port becomes a trunk port if the neighboring port is set to on or desirable mode. 802. The port becomes a trunk port if the neighboring port is set to on.

Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4 78-13315-02 5-3 . Using this configuration can result in spanning tree loops and is not recommended.Chapter 5 Configuring Ethernet VLAN Trunks Understanding How VLAN Trunks Work Table 5-3 Results of Possible Fast Ethernet and Gigabit Ethernet Trunk Configurations Neighbor Port Trunk Mode and Trunk Encapsulation off isl or dot1q Local Port Trunk Mode and Trunk Encapsulation off isl or dot1q Local: Nontrunk on isl Local: ISL trunk desirable isl Local: Nontrunk auto isl Local: Nontrunk on dot1q Local: 1Q trunk desirable dot1q Local: Nontrunk auto dot1q Local: Nontrunk desirable negotiate Local: Nontrunk auto negotiate Local: Nontrunk Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Nontrunk Nontrunk Nontrunk Nontrunk Nontrunk Nontrunk Nontrunk Nontrunk Nontrunk on isl Local: Nontrunk Local: ISL trunk Local: ISL trunk Local: ISL trunk Local: Local: 1Q trunk1 Nontrunk Local: Nontrunk Local: ISL trunk Local: ISL trunk Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: ISL trunk ISL trunk ISL trunk ISL trunk ISL trunk 1 ISL trunk ISL trunk ISL trunk ISL trunk desirable isl Local: Nontrunk Local: ISL trunk Local: ISL trunk Local: ISL trunk Local: 1Q trunk Local: Nontrunk Local: Nontrunk Local: ISL trunk Local: ISL trunk Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Nontrunk ISL trunk ISL trunk ISL trunk Nontrunk Nontrunk Nontrunk ISL trunk ISL trunk auto isl Local: Nontrunk Local: ISL trunk Local: ISL trunk Local: Nontrunk Local: 1Q trunk Local: Nontrunk Local: Nontrunk Local: ISL trunk Local: Nontrunk Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Nontrunk ISL trunk ISL trunk Nontrunk Nontrunk Nontrunk Nontrunk ISL trunk Nontrunk on dot1q Local: Nontrunk Local: Local: ISL trunk1 Nontrunk Local: Nontrunk Local: 1Q trunk Local: 1Q trunk Local: 1Q trunk Local: 1Q trunk Local: 1Q trunk Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: 1Q trunk 1Q trunk1 1Q trunk 1Q trunk 1Q trunk 1Q trunk 1Q trunk 1Q trunk 1Q trunk desirable dot1q Local: Nontrunk Local: ISL trunk Local: Nontrunk Local: Nontrunk Local: 1Q trunk Local: 1Q trunk Local: 1Q trunk Local: 1Q trunk Local: 1Q trunk Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Nontrunk Nontrunk Nontrunk Nontrunk 1Q trunk 1Q trunk 1Q trunk 1Q trunk 1Q trunk auto dot1q Local: Nontrunk Local: ISL trunk Local: Nontrunk Local: Nontrunk Local: 1Q trunk Local: 1Q trunk Local: Nontrunk Local: 1Q trunk Local: Nontrunk Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Nontrunk Nontrunk Nontrunk Nontrunk 1Q trunk 1Q trunk Nontrunk 1Q trunk Nontrunk desirable negotiate Local: Nontrunk Local: ISL trunk Local: ISL trunk Local: ISL trunk Local: 1Q trunk Local: 1Q trunk Local: 1Q trunk Local: ISL trunk Local: ISL trunk Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Nontrunk ISL trunk ISL trunk ISL trunk 1Q trunk 1Q trunk 1Q trunk ISL trunk ISL trunk auto negotiate Local: Nontrunk Local: ISL trunk Local: ISL trunk Local: Nontrunk Local: 1Q trunk Local: 1Q trunk Local: Nontrunk Local: ISL trunk Local: Nontrunk Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Neighbor: Nontrunk ISL trunk ISL trunk Nontrunk 1Q trunk 1Q trunk Nontrunk ISL trunk Nontrunk 1.

non-Cisco switches do not recognize these frames as BPDUs and flood them on all ports in the corresponding VLAN.1Q trunk is the same on both ends of the trunk link. • • • • Because Cisco switches transmit BPDUs to the SSTP multicast MAC address on VLANs other than the native VLAN of the trunk. disable spanning tree on every VLAN in the network. If the native VLAN on one end of the trunk is different from the native VLAN on the other end. the MST of the non-Cisco switch and the native VLAN spanning-tree of the Cisco switch combine to form a single spanning-tree topology known as the Common Spanning Tree (CST).1Q trunk. Other Cisco switches connected to the non-Cisco 802.1D spanning tree multicast MAC address (01-80-C2-00-00-00). Disabling spanning tree on the native VLAN of an 802.1Q trunks.1Q trunks connecting the Cisco switches to the non-Cisco 802. If this is not possible. all of the connections MUST be through 802.4 5-4 78-13315-02 . The Cisco switch sends an untagged IEEE BDPU (01-80-C2-00-00-00) on VLAN 1 for the CST and on the native VLAN the Cisco switch sends an untagged Cisco BPDU (01-00-0C-CC-CC-CC) which the non-Cisco switch forwards but does not act on (the IEEE BPDU is not forwarded on the native VLAN). When you connect two Cisco switches through 802. spanning tree loops might result.1Q trunk without disabling spanning tree on every VLAN in the network can cause spanning tree loops.1Q switches. 802. Make sure your network is free of physical loops before disabling spanning tree. When you connect a Cisco switch to a non-Cisco switch the CST is always on VLAN 1.1Q cloud through ISL trunks or through access ports.1Q switches maintain only a single instance of spanning tree (the Mono Spanning Tree.1Q trunk.1Q cloud.1Q cloud receive these flooded BPDUs. ensure that trunking is turned off on ports connected to non-switch devices if you do not intend to trunk across those links.1Q trunk. Make certain that the native VLAN is the same on ALL of the 802. The BPDUs on all other VLANs on the trunk are sent tagged to the reserved Cisco Shared Spanning Tree (SSTP) multicast MAC address (01-00-0c-cc-cc-cd). • • Catalyst 6000 Family Software Configuration Guide—Releases 6. the switches exchange spanning tree BPDUs on each VLAN allowed on the trunks. We recommend that you leave spanning tree enabled on the native VLAN of an 802. To avoid this problem. The non-Cisco 802. use the nonegotiate keyword to cause the port to become a trunk but not generate DTP frames.Chapter 5 Understanding How VLAN Trunks Work Configuring Ethernet VLAN Trunks Note DTP is a point-to-point protocol. Doing so will cause the switch to place the ISL trunk port or access port into the spanning tree “port inconsistent” state and no traffic will pass through the port. This allows Cisco switches to maintain a per-VLAN spanning tree topology across a cloud of non-Cisco 802. make sure the native VLAN for an 802. When manually enabling trunking on a link to a Cisco router.1Q trunks: • When connecting Cisco switches through an 802.1Q trunks. You CANNOT connect Cisco switches to a non-Cisco 802. The BPDUs on the native VLAN of the trunk are sent untagged to the reserved IEEE 802.1Q cloud separating the Cisco switches is treated as a single broadcast segment between all switches connected to the non-Cisco 802.1Q cloud. However. some internetworking devices might forward DTP frames improperly.1Q cloud through 802.1Q trunks impose some limitations on the trunking strategy for a network. Non-Cisco 802. When you connect a Cisco switch to a non-Cisco switch through an 802.1Q trunks. If you are connecting multiple Cisco switches to a non-Cisco 802.3 and 6. Note these restrictions when using 802. or MST) that defines the spanning-tree topology for all VLANs.1Q Trunk Restrictions The following configuration guidelines and restrictions apply when using 802.

1Q Negotiating Trunk Port.--------------------------------------------------------------------1/1 1-1005. perform this task in privileged mode: Task Step 1 Step 2 Command set trunk mod/port [on | desirable | auto | nonegotiate] isl show trunk [mod/port] Configure an ISL trunk. page 5-vii Defining the Allowed VLANs on a Trunk. 1025-4094 Configuring a Trunk Link These sections describe how to configure a trunk link on Ethernet ports and how to define the allowed VLAN range on a trunk: • • • • • Configuring an ISL Trunk. This example assumes that the neighboring port is in auto mode: Console> (enable) set trunk 1/1 on Port(s) 1/1 trunk mode set to on. Verify the trunking configuration.----------1/1 on isl trunking 1 Port Vlans allowed on trunk -------. page 5-ix Configuring an ISL Trunk To configure an ISL trunk.22:16:40:PAGP-5:Port 1/1 joined bridge port 1/1.1Q Trunk. This example shows how to configure a port as a trunk and how to verify the trunk configuration. page 5-v Configuring an 802.22:16:39:DTP-5:Port 1/1 has become isl trunk 06/16/1998. Table 5-4 Default Ethernet Trunk Configuration Feature Trunk mode Trunk encapsulation Allowed VLAN range Default Configuration auto negotiate VLANs 1–1005.-----------. 1025-4094 Catalyst 6000 Family Software Configuration Guide—Releases 6. page 5-vi Configuring an ISL/802. page 5-viii Disabling a Trunk Port.4 78-13315-02 5-5 .------------. Console> (enable) 06/16/1998.22:16:40:PAGP-5:Port 1/1 left bridge port 1/1.Chapter 5 Configuring Ethernet VLAN Trunks Default Trunk Configuration Default Trunk Configuration Table 4 shows the default Ethernet trunk configuration. Console> (enable) show trunk Port Mode Encapsulation Status Native vlan -------. 06/16/1998.3 and 6.----------.

--------------------------------------------------------------------1/2 Console> (enable) Configuring an 802.22:20:16:DTP-5:Port 1/2 has become isl trunk 06/16/1998.1Q trunk. Console> (enable) show trunk 1/2 Port Mode Encapsulation Status Native vlan -------.--------------------------------------------------------------------1/1 1.--------------------------------------------------------------------1/1 Console> (enable) This example shows how to place a port in desirable mode and how to verify the trunk configuration.----------.18:22:25:DTP-5:Port 2/9 has become dot1q trunk trunk Encapsulation ------------dot1q Console> (enable) show Port Mode -------.22:20:16:PAGP-5:Port 1/2 joined bridge port 1/2. 1025-4094 Port Vlans allowed and active in management domain -------. This example shows how to configure an 802. 06/16/1998.1Q trunk and how to verify the trunk configuration: Console> (enable) Port(s) 2/9 trunk Port(s) 2/9 trunk Console> (enable) set trunk 2/9 desirable dot1q mode set to desirable.1Q trunk.----------2/9 desirable Port -------2/9 Status -----------trunking Native vlan ----------1 Vlans allowed on trunk --------------------------------------------------------------------1-1005.521-524 Port Vlans in spanning tree forwarding state and not pruned -------.3 and 6. Verify the trunking configuration. type set to dot1q. perform this task in privileged mode: Task Step 1 Step 2 Command set trunk mod/port [on | desirable | auto | nonegotiate] dot1q show trunk [mod/port] Configure an 802.--------------------------------------------------------------------1/2 1.22:20:16:PAGP-5:Port 1/2 left bridge port 1/2. 1025-4094 Catalyst 6000 Family Software Configuration Guide—Releases 6.4 5-6 78-13315-02 .----------1/2 desirable isl trunking 1 Port Vlans allowed on trunk -------.-----------.------------.--------------------------------------------------------------------1/2 1-1005.Chapter 5 Configuring a Trunk Link Configuring Ethernet VLAN Trunks Port Vlans allowed and active in management domain -------. This example assumes that the neighboring port is in auto mode: Console> (enable) set trunk 1/2 desirable Port(s) 1/2 trunk mode set to desirable. Console> (enable) 06/16/1998.521-524 Port Vlans in spanning tree forwarding state and not pruned -------. 07/02/1998.1Q Trunk To configure an 802.

you can remove VLANs from the allowed list to prevent traffic for those VLANs from passing over the trunk.800.900.-----------.700.10-32.--------------------------------------------------------------------4/11 1.998-1000 Console> (enable) Defining the Allowed VLANs on a Trunk When you configure a trunk port.300.400. Verify the trunking configuration.55.700.1000 Port Vlans in spanning tree forwarding state and not pruned -------.400. Catalyst 6000 Family Software Configuration Guide—Releases 6.55. However.----------4/11 desirable n-isl trunking 1 Port -------4/11 Port -------4/11 Vlans allowed on trunk --------------------------------------------------------------------1-1005.300.10-32.--------------------------------------------------------------------2/9 5.Chapter 5 Configuring Ethernet VLAN Trunks Configuring a Trunk Link Port -------2/9 Vlans allowed and active in management domain --------------------------------------------------------------------1.5.3 and 6.4 78-13315-02 5-7 .----------.250.1000 Console> (enable) Configuring an ISL/802.5.900.600.10-32.998-1000 Port Vlans in spanning tree forwarding state and not pruned -------.101-120.101-120.1025-4094 Vlans allowed and active in management domain --------------------------------------------------------------------1.600.5.10-32. Port(s) 4/11 trunk type set to negotiate.500. Console> (enable) set trunk 4/11 desirable negotiate Port(s) 4/11 trunk mode set to desirable.1Q).150.101-120. Console> (enable) show trunk 4/11 Port Mode Encapsulation Status Native vlan -------.1Q Negotiating Trunk Port To configure a trunk port to negotiate the trunk encapsulation type (either ISL or 802. This example shows how to configure a port to negotiate the encapsulation type and how to verify the trunk configuration. perform this task in privileged mode: Task Step 1 Step 2 Command set trunk mod/port [on | desirable | auto | nonegotiate] negotiate show trunk [mod/port] Configure a port to negotiate the trunk encapsulation type. This example assumes that the neighboring port is in auto mode with encapsulation set to isl or negotiate.250.200. all VLANs are added to the allowed VLANs list for that trunk.150.------------.200.101-120.800.500.

(Optional) Add specific VLANs to the allowed VLANs list for a trunk.2500 Port Vlans allowed and active in management domain -------.--------------------------------------------------------------------1/1 1.521-524 Port Vlans in spanning tree forwarding state and not pruned -------.----------. perform this task in privileged mode: Task Command Step 1 Step 2 Step 3 Remove VLANs from the allowed VLANs list for clear trunk mod/port vlans a trunk.-----------.--------------------------------------------------------------------1/1 1-100. entering the set trunk command always adds all VLANs to the allowed VLAN list for the trunk. Port(s) 1/1 allowed vlans modified to 1-100. perform this task in privileged mode: Task Step 1 Step 2 Command set trunk mod/port off show trunk [mod/port] Turn off trunking on a port. To define the allowed VLAN list for a trunk port. Catalyst 6000 Family Software Configuration Guide—Releases 6.500-1005. use a combination of the clear trunk and set trunk commands to specify the allowed VLANs. 500-1005. even if you specify a VLAN range (any specified VLAN range is ignored).3 and 6. Verify the trunking configuration.------------. Port 1/1 allowed vlans modified to 1-100. Verify the allowed VLAN list for the trunk. Console> (enable) show trunk 1/1 Port Mode Encapsulation Status Native vlan -------. To modify the allowed VLANs list.--------------------------------------------------------------------1/1 1. VLANs 500–1005.521-524 Console> (enable) Disabling a Trunk Port To turn off trunking on a port. and VLAN 2500 on trunk port 1/1 and how to verify the allowed VLAN list for the trunk: Console> (enable) clear trunk 1/1 101-499 Removing Vlan(s) 101-499 from allowed list.2500.4 5-8 78-13315-02 .----------1/1 desirable isl trunking 1 Port Vlans allowed on trunk -------.500-1005. Console> (enable) set trunk 1/1 2500 Adding vlans 2500 to allowed list.Chapter 5 Configuring a Trunk Link Configuring Ethernet VLAN Trunks Note When you first configure a port as a trunk. set trunk mod/port vlans show trunk [mod/port] This example shows how to define the allowed VLANs list to allow VLANs 1–100.

Both ports are in their default state.3 and 6. Switch1> (enable) show trunk 1/1 Port Mode Encapsulation Status Native vlan -------. Switch1> (enable) set trunk 1/1 desirable Port(s) 1/1 trunk mode set to desirable. ISL encapsulation is assumed based on the hardware type.--------------------------------------------------------------------1/1 1. Switch1> (enable) Step 2 Check the configuration by entering the show trunk command. The Status field in the screen output indicates that port 1/1 is trunking.521-524 Catalyst 6000 Family Software Configuration Guide—Releases 6.----------. By specifying the desirable keyword. In this example. the trunk is automatically negotiated with the neighboring port (port 1/2 on Switch 2).12:20:23:PAGP-5:Port 1/1 joined bridge port 1/1. page 5-x 802. page 5-xiii Load-Sharing VLAN Traffic Over Parallel Trunks Example. Step 1 Configure port 1/1 on Switch 1 as an ISL trunk port by entering the set trunk command. Example VLAN Trunk Configurations This section contains example VLAN trunk configurations: • • • • ISL Trunk Configuration Example. 06/18/1998.4 78-13315-02 5-9 .----------1/1 desirable isl trunking 1 Port Vlans allowed on trunk -------.------------. Verify the trunking configuration.--------------------------------------------------------------------1/1 1-1005. 1025-4094 Port Vlans allowed and active in management domain -------. port 1/1 on Switch 1 is connected to a Fast Ethernet port on another switch. with the trunk mode set to auto (for more information.Chapter 5 Configuring Ethernet VLAN Trunks Example VLAN Trunk Configurations To return a port to the default trunk type and mode for that port type.-----------. page 5-ix ISL Trunk Over EtherChannel Link Example. perform this task in privileged mode: Task Step 1 Step 2 Command clear trunk mod/port show trunk [mod/port] Return the port to the default trunking type and mode for that port type. page 5-xvii ISL Trunk Configuration Example This example shows how to configure an ISL trunk between two switches and how to limit the allowed VLANs on the trunk to VLAN 1 and VLANs 520–530.1Q Trunk Over EtherChannel Link Example.12:20:23:DTP-5:Port 1/1 has become isl trunk 06/18/1998. see the “Default Trunk Configuration” section on page 5-v). Switch1> (enable) 06/18/1998.12:20:23:PAGP-5:Port 1/1 left bridge port 1/1.

--------------------------------------------------------------------1/1 Switch1> (enable) Step 3 Define the allowed VLAN list for the trunk by entering the clear trunk command to remove the VLANs that should not pass traffic over the trunk link. Figure 1 shows two switches connected through two 100BASE-TX Fast Ethernet ports.521-524 (enable) Step 4 Verify connectivity across the trunk by entering the ping command. allowed vlans modified to 1. Switch1> (enable) ping switch2 switch2 is alive Switch1> (enable) ISL Trunk Over EtherChannel Link Example This example shows how to configure an ISL trunk over an EtherChannel link between two switches.----------desirable isl trunking 1 Vlans allowed on trunk --------------------------------------------------------------------1.520-1005. (enable) clear trunk 1/1 531-1005 Vlan(s) 531-1005 from allowed list.520-530.-----------.Chapter 5 Example VLAN Trunk Configurations Configuring Ethernet VLAN Trunks Port Vlans in spanning tree forwarding state and not pruned -------. allowed vlans modified to 1. Switch1> Removing Port 1/1 Switch1> Removing Port 1/1 Switch1> Port -------1/1 Port -------1/1 Port -------1/1 Port -------1/1 Switch1> (enable) clear trunk 1/1 2-519 Vlan(s) 2-519 from allowed list.4 5-10 23925 78-13315-02 . Figure 5-1 ISL Trunk Over Fast EtherChannel Link Switch A 1/1 1/2 3/1 3/2 Switch B Fast EtherChannel ISL trunk link This example shows how to configure the switches to form a two-port EtherChannel bundle and then configure the EtherChannel bundle as an ISL trunk link.------------.520-530 Vlans allowed and active in management domain --------------------------------------------------------------------1. Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.521-524 Vlans in spanning tree forwarding state and not pruned --------------------------------------------------------------------1. (enable) show trunk 1/1 Mode Encapsulation Status Native vlan ----------.

--------. The system logging messages provide information about the formation of the EtherChannel bundle. Switch_A> (enable) Switch_B> (enable) show port channel No ports channelling Switch_B> (enable) show trunk No ports trunking.---------.--------. The configuration is applied to all of the ports in the bundle. Switch_A> (enable) show port channel No ports channelling Switch_A> (enable) show trunk No ports trunking.----------3/1 connected auto channel 3/2 connected auto channel ----. Switch_A> (enable) show port channel Port Status Channel Channel mode status ----. Switch_A> (enable) set port channel 1/1-2 desirable Port(s) 1/1-2 channel mode set to desirable. verify the configuration by entering the show port channel command.3 and 6.---------. This example assumes that the neighboring ports on Switch B are in EtherChannel auto mode.----------Switch_B> (enable) Neighbor device ------------------------WS-C5000 009979082(Sw WS-C5000 009979082(Sw ------------------------Neighbor port ---------3/1 3/2 ---------- Neighbor device ------------------------WS-C5500 069003103(Sw WS-C5500 069003103(Sw ------------------------- Neighbor port ---------1/1 1/2 ---------- Step 4 Configure one of the ports in the EtherChannel bundle to negotiate an ISL trunk by entering the set trunk command. Switch_B> (enable) Step 2 Configure the ports on Switch A to negotiate an EtherChannel bundle with the neighboring switch by entering the set port channel command. Catalyst 6000 Family Software Configuration Guide—Releases 6.--------.---------.--------. Switch_A> (enable) %PAGP-5-PORTFROMSTP:Port 1/1 left bridge port 1/1 %PAGP-5-PORTFROMSTP:Port 1/2 left bridge port 1/2 %PAGP-5-PORTFROMSTP:Port 1/2 left bridge port 1/2 %PAGP-5-PORTTOSTP:Port 1/1 joined bridge port 1/1-2 %PAGP-5-PORTTOSTP:Port 1/2 joined bridge port 1/1-2 Switch_B> (enable) %PAGP-5-PORTFROMSTP:Port 3/1 left bridge port 3/1 %PAGP-5-PORTFROMSTP:Port 3/2 left bridge port 3/2 %PAGP-5-PORTFROMSTP:Port 3/2 left bridge port 3/2 %PAGP-5-PORTTOSTP:Port 3/1 joined bridge port 3/1-2 %PAGP-5-PORTTOSTP:Port 3/2 joined bridge port 3/1-2 Step 3 After the EtherChannel bundle is negotiated. The system logging messages provide information about the formation of the ISL trunk.----------1/1 connected desirable channel 1/2 connected desirable channel ----. This example assumes that the neighboring ports on Switch B are configured to use isl or negotiate encapsulation and are in auto trunk mode.----------Switch_A> (enable) Switch_B> (enable) show port channel Port Status Channel Channel mode status ----.Chapter 5 Configuring Ethernet VLAN Trunks Example VLAN Trunk Configurations Step 1 Confirm the channeling and trunking status of the switches by entering the show port channel and show trunk commands.---------.4 78-13315-02 5-11 .

20.917.400.850. Port(s) 1/1-2 trunk type set to isl.152.152. Switch_A> (enable) %DTP-5-TRUNKPORTON:Port 1/1 has become isl trunk %DTP-5-TRUNKPORTON:Port 1/2 has become isl trunk %PAGP-5-PORTFROMSTP:Port 1/1 left bridge port 1/1-2 %PAGP-5-PORTFROMSTP:Port 1/2 left bridge port 1/1-2 %PAGP-5-PORTTOSTP:Port 1/1 joined bridge port 1/1-2 %PAGP-5-PORTTOSTP:Port 1/2 joined bridge port 1/1-2 Switch_B> (enable) %DTP-5-TRUNKPORTON:Port 3/1 has become isl trunk %DTP-5-TRUNKPORTON:Port 3/2 has become isl trunk %PAGP-5-PORTFROMSTP:Port 3/1 left bridge port 3/1-2 %PAGP-5-PORTFROMSTP:Port 3/2 left bridge port 3/1-2 %PAGP-5-PORTTOSTP:Port 3/1 joined bridge port 3/1-2 %PAGP-5-PORTTOSTP:Port 3/2 joined bridge port 3/1-2 Step 5 After the ISL trunk link is negotiated.917.999 1-5. 1025-4094 1-1005.850.801.999 Vlans in spanning tree forwarding state and not pruned --------------------------------------------------------------------1-5.400.570.20.850.570.999 Vlans in spanning tree forwarding state and not pruned --------------------------------------------------------------------1-5.850.570.917.570.521-524.300.50.400. verify the configuration by entering the show trunk command.200.999 1-5.917.521-524. Switch_A> Port -------1/1 1/2 Port -------1/1 1/2 Port -------1/1 1/2 Port -------1/1 1/2 Switch_A> Switch_B> Port -------3/1 3/2 Port -------3/1 3/2 Port -------3/1 3/2 Port -------3/1 3/2 Switch_B> (enable) show trunk Mode Encapsulation ----------.917.50.Chapter 5 Example VLAN Trunk Configurations Configuring Ethernet VLAN Trunks Switch_A> (enable) set trunk 1/1 desirable isl Port(s) 1/1-2 trunk mode set to desirable.50.152.50.521-524.20.521-524.500.999 (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.------------auto isl auto isl Status -----------trunking trunking Native vlan ----------1 1 Vlans allowed on trunk --------------------------------------------------------------------1-1005.400.20.521-524.300.999 1-5.152.20.152.152.10.500.500.------------desirable isl desirable isl Status -----------trunking trunking Native vlan ----------1 1 Vlans allowed on trunk --------------------------------------------------------------------1-1005.917.300.200.10.10.10.4 5-12 78-13315-02 .10.500.200.850.999 (enable) (enable) show trunk Mode Encapsulation ----------.521-524.300.200.152.20.200.10.500.801.50.570.500.50.300.400.570.400.200.850.200.20.300.850.10.300.200.500.300.521-524.50.400. 1025-4094 1-1005.917.521-524.850.10.570. 1025-4094 Vlans allowed and active in management domain --------------------------------------------------------------------1-5.20.400.917. 1025-4094 Vlans allowed and active in management domain --------------------------------------------------------------------1-5.152.999 1-5.50.570.3 and 6.500.

Switch_A> (enable) show port channel No ports channelling Switch_A> (enable) show trunk No ports trunking.4 78-13315-02 23848 Gigabit EtherChannel 5-13 . all ports are configured as members of VLAN 1. Switch_B> (enable) Step 3 Configure the ports on Switch A to negotiate an EtherChannel bundle with the neighboring switch by entering the set port channel command. Step 1 Make sure all ports on both Switch A and Switch B are assigned to the same VLAN by entering the set vlan command. Figure 5-2 802. In this example.----------------------1 2/1-6 Switch_A> (enable) Switch_B> (enable) set vlan 1 3/3-6 VLAN Mod/Ports ---.Chapter 5 Configuring Ethernet VLAN Trunks Example VLAN Trunk Configurations 802.1Q Trunk Over EtherChannel Link Example This example shows how to configure an 802.1Q trunk over an EtherChannel link between two switches.3 and 6.1Q trunk link. This VLAN is used as the 802. This example assumes that the neighboring ports on Switch B are in EtherChannel auto mode.1Q trunk link This example shows how to configure the switches to form a four-port EtherChannel bundle and then configure the EtherChannel bundle as an 802.----------------------1 3/1-6 Switch_B> (enable) Step 2 Confirm the channeling and trunking status of the switches by entering the show port channel and show trunk commands. Switch_A> (enable) Switch_B> (enable) show port channel No ports channelling Switch_B> (enable) show trunk No ports trunking. Catalyst 6000 Family Software Configuration Guide—Releases 6. Figure 2 shows two switches connected through four 1000BASE-SX Gigabit Ethernet ports.1Q native VLAN for the trunk. Switch_A> (enable) set vlan 1 2/3-6 VLAN Mod/Ports ---. The system logging messages provide information about the formation of the EtherChannel bundle.1Q Trunk Over EtherChannel Link Switch A 2/3 2/4 2/5 2/6 3/3 3/4 3/5 3/6 Switch B IEEE 802.

Chapter 5 Example VLAN Trunk Configurations Configuring Ethernet VLAN Trunks Switch_A> (enable) set port channel 2/3-6 desirable Port(s) 2/3-6 channel mode set to desirable. Port(s) 2/3-6 trunk type set to dot1q.---------.---------.----------2/3 connected desirable channel 2/4 connected desirable channel 2/5 connected desirable channel 2/6 connected desirable channel ----.--------.4 5-14 78-13315-02 .1Q trunk by entering the set trunk command. The configuration is applied to all of the ports in the bundle.1Q trunk. Switch_A> (enable) %DTP-5-TRUNKPORTON:Port 2/3 has become dot1q trunk Catalyst 6000 Family Software Configuration Guide—Releases 6.----------Switch_B> (enable) Neighbor device ------------------------WS-C4003 JAB023806(Sw WS-C4003 JAB023806(Sw WS-C4003 JAB023806(Sw WS-C4003 JAB023806(Sw ------------------------Neighbor port ---------2/3 2/4 2/5 2/6 ---------- Neighbor device ------------------------WS-C4003 JAB023806(Sw WS-C4003 JAB023806(Sw WS-C4003 JAB023806(Sw WS-C4003 JAB023806(Sw ------------------------- Neighbor port ---------2/3 2/4 2/5 2/6 ---------- Step 5 Configure one of the ports in the EtherChannel bundle to negotiate an 802.--------. verify the configuration by entering the show port channel command.--------. This example assumes that the neighboring ports on Switch B are configured to use dot1q or negotiate encapsulation and are in auto trunk mode.---------.----------3/3 connected auto channel 3/4 connected auto channel 3/5 connected auto channel 3/6 connected auto channel ----. Switch_A> (enable) %PAGP-5-PORTFROMSTP:Port 2/3 left bridge port 2/3 %PAGP-5-PORTFROMSTP:Port 2/4 left bridge port 2/4 %PAGP-5-PORTFROMSTP:Port 2/5 left bridge port 2/5 %PAGP-5-PORTFROMSTP:Port 2/6 left bridge port 2/6 %PAGP-5-PORTFROMSTP:Port 2/4 left bridge port 2/4 %PAGP-5-PORTFROMSTP:Port 2/5 left bridge port 2/5 %PAGP-5-PORTFROMSTP:Port 2/6 left bridge port 2/6 %PAGP-5-PORTFROMSTP:Port 2/3 left bridge port 2/3 %PAGP-5-PORTTOSTP:Port 2/3 joined bridge port 2/3-6 %PAGP-5-PORTTOSTP:Port 2/4 joined bridge port 2/3-6 %PAGP-5-PORTTOSTP:Port 2/5 joined bridge port 2/3-6 %PAGP-5-PORTTOSTP:Port 2/6 joined bridge port 2/3-6 Switch_B> (enable) %PAGP-5-PORTFROMSTP:Port 3/3 left bridge port 3/3 %PAGP-5-PORTFROMSTP:Port 3/4 left bridge port 3/4 %PAGP-5-PORTFROMSTP:Port 3/5 left bridge port 3/5 %PAGP-5-PORTFROMSTP:Port 3/6 left bridge port 3/6 %PAGP-5-PORTFROMSTP:Port 3/4 left bridge port 3/4 %PAGP-5-PORTFROMSTP:Port 3/5 left bridge port 3/5 %PAGP-5-PORTFROMSTP:Port 3/6 left bridge port 3/6 %PAGP-5-PORTFROMSTP:Port 3/3 left bridge port 3/3 %PAGP-5-PORTTOSTP:Port 3/3 joined bridge port 3/3-6 %PAGP-5-PORTTOSTP:Port 3/4 joined bridge port 3/3-6 %PAGP-5-PORTTOSTP:Port 3/5 joined bridge port 3/3-6 %PAGP-5-PORTTOSTP:Port 3/6 joined bridge port 3/3-6 Step 4 After the EtherChannel bundle is negotiated. Switch_A> (enable) show port channel Port Status Channel Channel mode status ----.----------Switch_A> (enable) Switch_B> (enable) show port channel Port Status Channel Channel mode status ----.3 and 6. The system logging messages provide information about the formation of the 802.--------.---------. Switch_A> (enable) set trunk 2/3 desirable dot1q Port(s) 2/3-6 trunk mode set to desirable.

10.500.500.570.10. 1025-4094 Vlans allowed and active in management domain --------------------------------------------------------------------1-5.20.20. Switch_A> Port -------2/3 2/4 2/5 2/6 Port -------2/3 2/4 2/5 2/6 Port -------2/3 2/4 2/5 2/6 (enable) show trunk Mode Encapsulation ----------.20.850.917.570.1Q trunk link is negotiated.500. 1025-4094 1-1005.300.------------desirable dot1q desirable dot1q desirable dot1q desirable dot1q Status -----------trunking trunking trunking trunking Native vlan ----------1 1 1 1 Vlans allowed on trunk --------------------------------------------------------------------1-1005.570.4 78-13315-02 5-15 .850.917.521-524. verify the configuration by entering the show trunk command.300.50.521-524.152.20.917.850.570.300.400.999 1-5.Chapter 5 Configuring Ethernet VLAN Trunks Example VLAN Trunk Configurations %DTP-5-TRUNKPORTON:Port 2/4 has become dot1q trunk %PAGP-5-PORTFROMSTP:Port 2/3 left bridge port 2/3-6 %DTP-5-TRUNKPORTON:Port 2/5 has become dot1q trunk %PAGP-5-PORTFROMSTP:Port 2/4 left bridge port 2/3-6 %PAGP-5-PORTFROMSTP:Port 2/5 left bridge port 2/3-6 %DTP-5-TRUNKPORTON:Port 2/6 has become dot1q trunk %PAGP-5-PORTFROMSTP:Port 2/6 left bridge port 2/3-6 %PAGP-5-PORTFROMSTP:Port 2/3 left bridge port 2/3 %PAGP-5-PORTTOSTP:Port 2/3 joined bridge port 2/3-6 %PAGP-5-PORTTOSTP:Port 2/4 joined bridge port 2/3-6 %PAGP-5-PORTTOSTP:Port 2/5 joined bridge port 2/3-6 %PAGP-5-PORTTOSTP:Port 2/6 joined bridge port 2/3-6 Switch_B> (enable) %DTP-5-TRUNKPORTON:Port 3/3 has become dot1q trunk %DTP-5-TRUNKPORTON:Port 3/4 has become dot1q trunk %PAGP-5-PORTFROMSTP:Port 3/3 left bridge port 3/3-6 %PAGP-5-PORTFROMSTP:Port 3/4 left bridge port 3/3-6 %PAGP-5-PORTFROMSTP:Port 3/5 left bridge port 3/3-6 %PAGP-5-PORTFROMSTP:Port 3/6 left bridge port 3/3-6 %DTP-5-TRUNKPORTON:Port 3/5 has become dot1q trunk %DTP-5-TRUNKPORTON:Port 3/6 has become dot1q trunk %PAGP-5-PORTFROMSTP:Port 3/5 left bridge port 3/3-6 %PAGP-5-PORTFROMSTP:Port 3/6 left bridge port 3/3-6 %PAGP-5-PORTTOSTP:Port 3/3 joined bridge port 3/3-6 %PAGP-5-PORTTOSTP:Port 3/4 joined bridge port 3/3-6 %PAGP-5-PORTTOSTP:Port 3/5 joined bridge port 3/3-6 %PAGP-5-PORTTOSTP:Port 3/6 joined bridge port 3/3-6 Step 6 After the 802.917.200.10.--------------------------------------------------------------------2/3 2/4 2/5 2/6 Switch_A> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. 1025-4094 1-1005.50. 1025-4094 1-1005.400.152.521-524.300.50.999 1-5.999 1-5.50.152.850.999 Port Vlans in spanning tree forwarding state and not pruned -------.3 and 6.521-524.400.200.200.400.10.200.500.152.

570.50.20.10.200.400.400.521-524.850.20.850.999 1-5.850. which reduces the total traffic carried over each trunk while still maintaining a fault-tolerant configuration.300.152.500.850.999 1-5.850.521-524.521-524.500.500.Chapter 5 Example VLAN Trunk Configurations Configuring Ethernet VLAN Trunks Switch_B> Port -------3/3 3/4 3/5 3/6 Port -------3/3 3/4 3/5 3/6 Port -------3/3 3/4 3/5 3/6 Port -------3/3 3/4 3/5 3/6 Switch_B> (enable) show trunk Mode Encapsulation ----------.400.200.152.152.521-524.521-524.10.500.152.999 Vlans in spanning tree forwarding state and not pruned --------------------------------------------------------------------1-5.20.400.4 5-16 78-13315-02 .570. you can load-share VLAN traffic over parallel trunk ports so that traffic from some VLANs travels over one trunk.300. 1025-4094 1-1005.200.152.10.20. Figure 3 shows a parallel trunk configuration between two switches. using the Fast Ethernet uplink ports on the supervisor engine.300. while traffic from other VLANs travels over the other trunk.500.400.20.917.917.917.200.10.300.50.521-524.300.400.50.999 1-5.152.300.50.50.3 and 6.999 1-5.570.570.------------auto dot1q auto dot1q auto dot1q auto dot1q Status -----------trunking trunking trunking trunking Native vlan ----------1 1 1 1 Vlans allowed on trunk --------------------------------------------------------------------1-1005.20. 1025-4094 1-1005.400.917.50.500.50. Catalyst 6000 Family Software Configuration Guide—Releases 6.999 1-5.917.200.200.999 (enable) Load-Sharing VLAN Traffic Over Parallel Trunks Example Using spanning tree port-VLAN priorities. This configuration allows traffic to be carried over both trunks simultaneously (instead of keeping one trunk in blocking mode).500.20.999 1-5.521-524.20.300.200.850.10.50.10.917.570.917.200.570.570.10. 1025-4094 Vlans allowed and active in management domain --------------------------------------------------------------------1-5.152.850.521-524.570.500.10.400.152.300.917. 1025-4094 1-1005.850.

20. 30. 50.3 and 6. 20. Switch_1> (enable) set vlan 10 Vlan 10 configuration successful Switch_1> (enable) set vlan 20 Vlan 20 configuration successful Switch_1> (enable) set vlan 30 Vlan 30 configuration successful Switch_1> (enable) set vlan 40 Vlan 40 configuration successful Switch_1> (enable) set vlan 50 Vlan 50 configuration successful Switch_1> (enable) set vlan 60 Vlan 60 configuration successful Switch_1> (enable) Step 3 Verify the VTP and VLAN configuration on Switch 1 by entering the show vtp domain and show vlan commands. Make sure Switch 1 is a VTP server. 30. and 60: port-VLAN priority 32 (forwarding) By default. 50. and 60. 40. Catalyst 6000 Family Software Configuration Guide—Releases 6. 50. the port-VLAN priority for both trunks is equal (a value of 32). Trunk 2 is not used to forward traffic unless Trunk 1 fails.Chapter 5 Configuring Ethernet VLAN Trunks Example VLAN Trunk Configurations Figure 5-3 Parallel Trunk Configuration Before Configuring VLAN-Traffic Load Sharing Trunk 2 VLANs 10. 40. You can configure Switch 2 as a VTP client or as a VTP server. 20.4 78-13315-02 16750 5-17 . Step 1 Configure a VTP domain on both Switch 1 and Switch 2 by entering the set vtp command so that the VLAN information configured on Switch 1 is learned by Switch 2. you see VLANs 10. and 60: port-VLAN priority 32 (blocking) Switch 1 1/1 1/1 Switch 2 1/2 1/2 Trunk 1 VLANs 10. 40. This example shows how to configure the switches so that traffic from multiple VLANs is load balanced over the parallel trunks. 30. STP blocks port 1/2 (Trunk 2) for each VLAN on Switch 1 to prevent forwarding loops. Switch_1> (enable) set vtp domain BigCorp mode server VTP domain BigCorp modified Switch_1> (enable) Switch_2> (enable) set vtp domain BigCorp mode server VTP domain BigCorp modified Switch_2> (enable) Step 2 Create the VLANs on Switch 1 by entering the set vlan command. In this example.

4 5-18 78-13315-02 .20. 1025-4094 1-1005.------------desirable isl desirable isl Status -----------trunking trunking Native vlan ----------1 1 Vlans allowed on trunk --------------------------------------------------------------------1-1005. Switch_1> Port -------1/1 1/2 Port -------1/1 1/2 Port -------1/1 1/2 (enable) show trunk 1 Mode Encapsulation ----------.----------.Chapter 5 Example VLAN Trunk Configurations Configuring Ethernet VLAN Trunks Switch_1> (enable) show vtp domain Domain Name Domain Index VTP Version Local Mode Password -------------------------------. Switch_1> (enable) set trunk 1/1 desirable Port(s) 1/1 trunk mode set to desirable. Vlans ---.60 1.50.30.---------BigCorp 1 2 server Vlan-count Max-vlan-storage Config Revision Notifications ---------.---------------------------1 default active 1/1-2 2/1-12 5/1-2 10 VLAN0010 active 20 VLAN0020 active 30 VLAN0030 active 40 VLAN0040 active 50 VLAN0050 active 60 VLAN0060 active 1002 fddi-default active 1003 token-ring-default active 1004 fddinet-default active 1005 trnet-default active .-------. Switch_1> (enable) 04/21/1998.20.30.10. 1025-4094 Vlans allowed and active in management domain --------------------------------------------------------------------1.40. Switch_1> (enable) 04/21/1998.----------.--------.-------------------------------.-----------.------------------------172.3 and 6.--------------.------------11 1023 13 disabled Last Updater V2 Mode Pruning PruneEligible on Vlans --------------.40.03:05:13:DISL-5:Port 1/2 has become isl trunk Step 5 Verify that the trunk links are up by entering the show trunk command. .-------.---------------.20.60 Catalyst 6000 Family Software Configuration Guide—Releases 6. Specifying the desirable mode on the Switch 1 ports causes the ports on Switch 2 to negotiate to become trunk links (assuming that the Switch 2 uplinks are in the default auto mode).10.50. . Switch_1> (enable) Step 4 Configure the supervisor engine uplinks on Switch 1 as ISL trunk ports by entering the set trunk command.52.10 disabled enabled 2-1000 Switch_1> (enable) show vlan VLAN Name Status Mod/Ports.03:05:05:DISL-5:Port 1/1 has become isl trunk Switch_1> (enable) set trunk 1/2 desirable Port(s) 1/2 trunk mode set to desirable.

------------. Switch_2> (enable) show vlan VLAN Name ---.---------------------------active active active active active active active active active active active Step 7 Note that spanning tree takes one to two minutes to converge..--------------------------------------------------------------------1/1 1/2 Switch_1> (enable) Step 6 Note that when the trunk links come up.-------------------------------1 default 10 VLAN0010 20 VLAN0020 30 VLAN0030 40 VLAN0040 50 VLAN0050 60 VLAN0060 1002 fddi-default 1003 token-ring-default 1004 fddinet-default 1005 trnet-default <..Chapter 5 Configuring Ethernet VLAN Trunks Example VLAN Trunk Configurations Port Vlans in spanning tree forwarding state and not pruned -------.output truncated.------------.> Switch_2> (enable) Status Mod/Ports.----1 forwarding 19 10 forwarding 19 20 forwarding 19 30 forwarding 19 40 forwarding 19 50 forwarding 19 60 forwarding 19 1003 not-connected 19 1005 not-connected 19 (enable) show spantree 1/2 Vlan Port-State Cost ---. Verify that Switch 2 has learned the VLAN configuration by entering the show vlan command on Switch 2.3 and 6.4 78-13315-02 5-19 ... Trunk 2 is blocking for all VLANs.----1 blocking 19 10 blocking 19 20 blocking 19 30 blocking 19 40 blocking 19 50 blocking 19 60 blocking 19 1003 not-connected 19 1005 not-connected 19 (enable) Priority -------32 32 32 32 32 32 32 32 4 Priority -------32 32 32 32 32 32 32 32 4 Fast-Start ---------disabled disabled disabled disabled disabled disabled disabled disabled disabled Fast-Start ---------disabled disabled disabled disabled disabled disabled disabled disabled disabled Group-method ------------ Group-method ------------ Catalyst 6000 Family Software Configuration Guide—Releases 6. VTP passes the VTP and VLAN configuration to Switch 2. check the spanning tree state of each trunk port on Switch 1 by entering the show spantree command. On Switch 2. both trunks are forwarding for all VLANs. Vlans --------. After the network stabilizes. but no traffic passes over Trunk 2 because port 1/2 on Switch 1 is blocking. Trunk 1 is forwarding for all VLANs. Switch_1> Port --------1/1 1/1 1/1 1/1 1/1 1/1 1/1 1/1 1/1 Switch_1> Port --------1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 Switch_1> (enable) show spantree 1/1 Vlan Port-State Cost ---.

11-19. Port 1/2 vlans 1005 using portpri 4.21-29. VLANs 10.20. Switch_1> (enable) set spantree portvlanpri 1/2 1 60 Port 1/2 vlans 1-39.21-1004 using portpri 32. Port 1/1 vlans 10 using portpri 1. Switch_2> (enable) set spantree portvlanpri 1/1 1 30 Port 1/1 vlans 1-9. Port 1/2 vlans 40. Port 1/1 vlans 10. Port 1/1 vlans 1005 using portpri 4.11-19.20 using portpri 1. change the port-VLAN priority for the Group 1 VLANs on Trunk 1 (port 1/1) to the same value you configured for those VLANs on Switch 1 by entering the set spantree portvlanpri command. or if one VLAN has heavier traffic than the others. and 30 (Group 1) are forwarded over Trunk 1.11-19. You might want traffic from half of the VLANs to go over one trunk link and half over the other. Switch_1> (enable) set spantree portvlanpri 1/1 1 20 Port 1/1 vlans 1-9.11-19.31-1004 using portpri 32.41-1004 using portpri 32.11-1004 using portpri 32. Port 1/1 vlans 10 using portpri 1. Caution The port-VLAN priority for each VLAN must be equal on both ends of the link. Port 1/1 vlans 10.31-1004 using portpri 32.50 using portpri 1. Port 1/1 vlans 1005 using portpri 4.30 using portpri 1. change the port-VLAN priority for the Group 1 VLANs on Trunk 1 (port 1/1) to an integer value lower than the default of 32 by entering the set spantree portvlanpri command. Port 1/2 vlans 1005 using portpri 4.51-1004 using portpri 32. Port 1/1 vlans 1005 using portpri 4. Port 1/1 vlans 10.30 using portpri 1. and VLANs 40. Port 1/1 vlans 10.51-59. you can forward traffic from that VLAN over one trunk and traffic from the other VLANs over the other trunk link. Note In the following steps.61-1004 using portpri 32.20 using portpri 1. Switch_1> (enable) set spantree portvlanpri 1/2 1 40 Port 1/2 vlans 1-39. 50. 20. and 60 (Group 2) are forwarded over Trunk 2.20.3 and 6.41-49. Switch_2> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. Step 9 On Switch 1. Port 1/1 vlans 1005 using portpri 4.21-1004 using portpri 32. Switch_1> (enable) Step 10 On Switch 1. Switch_1> (enable) Step 11 On Switch 2. Switch_2> (enable) set spantree portvlanpri 1/1 1 10 Port 1/1 vlans 1-9.21-29. Switch_2> (enable) set spantree portvlanpri 1/1 1 20 Port 1/1 vlans 1-9. Port 1/2 vlans 40 using portpri 1.50.41-49.Chapter 5 Example VLAN Trunk Configurations Configuring Ethernet VLAN Trunks Step 8 Divide the configured VLANs into two groups. Switch_1> (enable) set spantree portvlanpri 1/2 1 50 Port 1/2 vlans 1-39. Switch_1> (enable) set spantree portvlanpri 1/1 1 30 Port 1/1 vlans 1-9. change the port-VLAN priority for the Group 2 VLANs on Trunk 2 (port 1/2) to an integer value lower than the default of 32 by entering the set spantree portvlanpri command. Port 1/1 vlans 1005 using portpri 4. Switch_1> (enable) set spantree portvlanpri 1/1 1 10 Port 1/1 vlans 1-9. Port 1/2 vlans 40. Port 1/1 vlans 1005 using portpri 4. Port 1/2 vlans 1005 using portpri 4.60 using portpri 1.11-1004 using portpri 32.4 5-20 78-13315-02 .

------------. Switch_1> Port --------1/1 1/1 1/1 1/1 1/1 1/1 1/1 1/1 1/1 Switch_1> Port --------1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 Switch_1> (enable) show spantree 1/1 Vlan Port-State Cost ---.41-49. the spanning tree converges to use the new configuration.4 78-13315-02 5-21 . Step 13 Check the spanning tree port states on Switch 1 by entering the show spantree command.51-59. Switch_2> (enable) Note When you have configured the port-VLAN priorities on both ends of the link.61-1004 using portpri 32.Chapter 5 Configuring Ethernet VLAN Trunks Example VLAN Trunk Configurations Step 12 On Switch 2. Port 1/2 vlans 40.51-1004 using portpri 32. Switch_2> (enable) set spantree portvlanpri 1/2 1 40 Port 1/2 vlans 1-39.----1 blocking 19 10 blocking 19 20 blocking 19 30 blocking 19 40 forwarding 19 50 forwarding 19 60 forwarding 19 1003 not-connected 19 1005 not-connected 19 (enable) Priority -------32 1 1 1 32 32 32 32 4 Priority -------32 32 32 32 1 1 1 32 4 Fast-Start ---------disabled disabled disabled disabled disabled disabled disabled disabled disabled Fast-Start ---------disabled disabled disabled disabled disabled disabled disabled disabled disabled Group-method ------------ Group-method ------------ Figure 4 shows the network after you configure VLAN traffic load sharing. The Group 2 VLANs should block on Trunk 1 and forward on Trunk 2. Port 1/2 vlans 40. Switch_2> (enable) set spantree portvlanpri 1/2 1 50 Port 1/2 vlans 1-39.50 using portpri 1.3 and 6. Switch_2> (enable) set spantree portvlanpri 1/2 1 60 Port 1/2 vlans 1-39. Port 1/2 vlans 1005 using portpri 4.----1 forwarding 19 10 forwarding 19 20 forwarding 19 30 forwarding 19 40 blocking 19 50 blocking 19 60 blocking 19 1003 not-connected 19 1005 not-connected 19 (enable) show spantree 1/2 Vlan Port-State Cost ---. change the port-VLAN priority for the Group 2 VLANs on Trunk 2 (port 1/2) to the same value you configured for those VLANs on Switch 1 by entering the set spantree portvlanpri command. The Group 1 VLANs should forward on Trunk 1 and block on Trunk 2.------------. Port 1/2 vlans 1005 using portpri 4. Port 1/2 vlans 1005 using portpri 4.50.41-49.41-1004 using portpri 32. Port 1/2 vlans 40 using portpri 1.60 using portpri 1. Catalyst 6000 Family Software Configuration Guide—Releases 6.

STP reconverges to use Trunk 2 to forward traffic from all the VLANs.4 5-22 78-13315-02 . 20. and 60: port-VLAN priority 32 (blocking) Figure 4 shows that both trunks are utilized when the network is operating normally. 50.----1 not-connected 19 (enable) show spantree 1/2 Vlan Port-State Cost ---.3 and 6.------------. and 30: port-VLAN priority 32 (blocking) VLANs 40. If Trunk 1 fails in the network shown in Figure 4.------------.------------. and 30: port-VLAN priority 1 (forwarding) VLANs 40. 20.----1 learning 19 10 learning 19 20 learning 19 30 learning 19 40 forwarding 19 50 forwarding 19 60 forwarding 19 1003 not-connected 19 1005 not-connected 19 (enable) show spantree 1/2 Vlan Port-State Cost ---. if one trunk link fails. as shown in this example: Switch_1> (enable) 04/21/1998. and 60: port-VLAN priority 1 (forwarding) Switch 1 1/1 1/1 Switch 2 1/2 1/2 Trunk 1 VLANs 10. the other trunk link acts as an alternate forwarding path for the traffic previously traveling over the failed link.----1 forwarding 19 10 forwarding 19 20 forwarding 19 30 forwarding 19 40 forwarding 19 50 forwarding 19 60 forwarding 19 1003 not-connected 19 1005 not-connected 19 (enable) Priority -------32 Priority -------32 32 32 32 1 1 1 32 4 Priority -------32 32 32 32 1 1 1 32 4 Fast-Start ---------disabled Fast-Start ---------disabled disabled disabled disabled disabled disabled disabled disabled disabled Fast-Start ---------disabled disabled disabled disabled disabled disabled disabled disabled disabled 16749 Group-method ------------ Group-method ------------ Group-method ------------ Catalyst 6000 Family Software Configuration Guide—Releases 6. 50.03:15:40:DISL-5:Port 1/1 has become non-trunk Switch_1> Port --------1/1 Switch_1> Port --------1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 Switch_1> Port --------1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 Switch_1> (enable) show spantree 1/1 Vlan Port-State Cost ---.Chapter 5 Example VLAN Trunk Configurations Configuring Ethernet VLAN Trunks Figure 5-4 Parallel Trunk Configuration After Configuring VLAN-Traffic Load Sharing Trunk 2 VLANs 10.

and DTP.20. 1025-4094 Port Vlans allowed and active in management domain -------.1003.1005 Console> (enable) show config Catalyst 6000 Family Software Configuration Guide—Releases 6.400.1 003. VLAN 1 is enabled by default to allow control protocols to transmit and receive packets across the network topology.----------.801-802. When you disable VLAN 1 on a trunk interface.--------------------------------------------------------------------8/1 2-6.4 78-13315-02 5-23 . perform this task in privileged mode: Task Step 1 Step 2 Command clear trunk mod/port [vlan-range] show trunk [mod/port] Disable VLAN 1 on the trunk interface. Because spanning tree applies to the entire network. Port 8/1 allowed vlans modified to 2-1005.570.100. Port Aggregation Protocol (PAgP). the impact of broadcast storms increases.776.917.152.3 and 6.200.802.Chapter 5 Configuring Ethernet VLAN Trunks Disabling VLAN 1 on Trunks Disabling VLAN 1 on Trunks On the Catalyst 6000 family switches. Verify the allowed VLAN list for the trunk. when VLAN 1 is enabled on trunk links in a large complex network.999.10.50. When a trunk port with VLAN 1 disabled becomes a nontrunk port. However. If the native VLAN is VLAN 1.300.850.10.776.300.--------------------------------------------------------------------8/1 2-6.524.850. it is added to the native VLAN.500.521. Disabling VLAN 1 on a Trunk Link To disable VLAN 1 on a trunk interface.------------.521. To prevent this scenario. spanning tree loops might increase when you enable VLAN 1 on all trunk links.570.100. Console> (enable) show trunk 8/1 Port Mode Encapsulation Status -------.524.152.50. but the supervisor engine continues to transmit and receive packets from control protocols such as Cisco Discovery Protocol (CDP).9 99.500.917.20.400.-----------8/1 on isl trunking Port -------8/1 Native vlan ----------1 Vlans allowed on trunk --------------------------------------------------------------------2-1005. This example shows how to disable VLAN 1 on a trunk link and verify the configuration: Console> (enable) clear trunk 8/1 1 Removing Vlan(s) 1 from allowed list. VTP. no user traffic is transmitted and received across that trunk interface.200. you can disable VLAN 1 on trunk interfaces.1005 Port Vlans in spanning tree forwarding state and not pruned -------. the port is enabled and added to VLAN 1.

4 5-24 78-13315-02 .3 and 6.Chapter 5 Disabling VLAN 1 on Trunks Configuring Ethernet VLAN Trunks Catalyst 6000 Family Software Configuration Guide—Releases 6.

With software release 6. including those on a standby supervisor engine. All ports in each EtherChannel must be the same speed. page 6-iv Configuring EtherChannel. as well as to the uplink ports on the supervisor engine. Catalyst 6000 Family Software Configuration Guide—Releases 6. and Gigabit Ethernet switching modules. All Ethernet ports on all modules. Note With software release 6.2(1) and earlier releases. This chapter consists of these sections: • • • Understanding How EtherChannel Works. Note that the 13-slot chassis was first supported in software release 6.2(2) and later releases. refer to the Catalyst 6000 Family Command Reference publication. support EtherChannel (maximum of eight compatibly configured ports) with no requirement that ports be contiguous or on the same module.or 9-slot chassis and 63 for a 13-slot chassis. The configuration tasks in this chapter apply to Ethernet.and 9-slot Catalyst 6000 family switches support a maximum of 128 EtherChannels.2(2). Note For complete syntax and usage information for the commands used in this chapter. Understanding How EtherChannel Works EtherChannel bundles individual Ethernet links into a single logical link that provides bandwidth up to 1600 Mbps (Fast EtherChannel full duplex) or 16 Gbps (Gigabit EtherChannel) between a Catalyst 6000 family switch and another switch or host.3 and 6. the 6.C H A P T E R 6 Configuring EtherChannel This chapter describes how to use the command-line interface (CLI) to configure EtherChannel on the Catalyst 6000 family switches.4 78-13315-02 6-1 . due to the port ID handling by the spanning tree feature. page 6-v Note The commands in the following sections can be used on all Ethernet ports in the Catalyst 6000 family switches. page 6-i EtherChannel Configuration Guidelines. Fast Ethernet. the maximum supported number of EtherChannels is 126 for a 6.

PAgP packets are exchanged only between ports in auto and desirable modes. it groups the ports into an EtherChannel. Ports configured in on or off mode do not exchange PAgP packets. page 6-ii Understanding Frame Distribution. Only auto and desirable are PAgP modes. An administrative group may contain a maximum of eight ports. you can assign an administrative group number or let the next available administrative group number be assigned automatically. You can modify the auto and desirable modes with the silent and non-silent keywords. page 6-ii Understanding EtherChannel IDs.Chapter 6 Understanding How EtherChannel Works Configuring EtherChannel Note The network device to which a Catalyst 6000 family switch is connected may impose its own limits on the number of ports in an EtherChannel. page 6-iii Understanding Administrative Groups Configuring an EtherChannel creates an administrative group. The protocol learns the capabilities of port groups dynamically and informs the other ports. page 6-ii Understanding Port Aggregation Protocol. When an administrative group is created. traffic previously carried over the failed link switches to the remaining segments within the EtherChannel. After a channel is formed. Catalyst 6000 Family Software Configuration Guide—Releases 6. Forming a channel without specifying an administrative group number creates a new automatically numbered administrative group. If a segment within an EtherChannel fails. and desirable. A trap is sent upon a failure identifying the switch. the EtherChannel. ports are in auto silent mode. auto. to which the EtherChannel belongs. EtherChannel includes four user-configurable modes: on. Understanding Port Aggregation Protocol The Port Aggregation Protocol (PAgP) facilitates the automatic creation of EtherChannels by exchanging packets between Ethernet ports. and the failed link. The EtherChannel is then added to the spanning tree as a single bridge port. You can configure EtherChannels as trunks. configuring any port in the channel as a trunk applies the configuration to all ports in the channel. By default. These sections describe EtherChannel: • • • • Understanding Administrative Groups. After PAgP identifies correctly matched EtherChannel links.3 and 6. Identically configured trunk ports can be configured as an EtherChannel.4 6-2 78-13315-02 . off. Use the show channel group admin_group command to display the EtherChannel ID. designated by an integer between 1 and 1024. Inbound broadcast and multicast packets on one segment in an EtherChannel are blocked from returning on any other segment of the EtherChannel. Understanding EtherChannel IDs Each EtherChannel is automatically assigned a unique EtherChannel ID.

it uses source and destination Media Access Control (MAC) addresses. Mode that prevents the port from channeling. in which the port responds to PAgP packets it receives but does not initiate PAgP packet negotiation. based on criteria such as port speed. Enter the show module command for the supervisor engine to determine if EtherChannel frame distribution is configurable on your switch: • If the display shows the “Sub-Type” to be “L2 Switching Engine I WS-F6020. because neither port will initiate negotiation. trunking state. Ports can form an EtherChannel when they are in different PAgP modes as long as the modes are compatible: • • • A port in desirable mode can form an EtherChannel successfully with another port that is in desirable or auto mode.3 and 6. a usable EtherChannel exists only when a port group in on mode is connected to another port group in on mode. Table 6-1 EtherChannel Modes Mode on Description Mode that forces the port to channel without PAgP. PAgP mode that places a port into a passive negotiating state. A port in auto mode can form an EtherChannel with another port in desirable mode.” then EtherChannel frame distribution is not configurable on your switch. Both the auto and desirable modes allow ports to negotiate with connected ports to determine if they can form an EtherChannel. Understanding Frame Distribution EtherChannel distributes frames across the links in a channel by reducing part of the binary pattern formed from the addresses in the frame to a numerical value that selects one of the links in the channel. EtherChannel frame distribution is configurable with all other switching engines. • Catalyst 6000 Family Software Configuration Guide—Releases 6.4 78-13315-02 6-3 . (Default) off auto desirable silent non-silent Keyword that is used with the auto or desirable mode when traffic is expected from the other device. and VLAN numbers. in which the port initiates negotiations with other ports by sending PAgP packets.Chapter 6 Configuring EtherChannel Understanding How EtherChannel Works Table 1 describes EtherChannel modes. With the on mode. The default is to use source and destination IP addresses. (Default) PAgP mode that places a port into an active negotiating state. Keyword that is used with the auto or desirable mode when no traffic is expected from the other device to prevent the link from being reported to the Spanning Tree Protocol as down. A port in auto mode cannot form an EtherChannel with another port that is also in auto mode.

If you configure the EtherChannel as a trunk. Configure all ports in an EtherChannel to operate at the same speed and duplex mode. some EtherChannel ports are disabled automatically to avoid network loops and other problems. Use the option that provides the greatest variety in your configuration. if the traffic on a channel is going to a single MAC address only. In software releases prior to 6. configure the same trunk mode on all the ports in the EtherChannel. an EtherChannel is preserved even if it contains only one port.4 6-4 78-13315-02 . can form an EtherChannel as long they are otherwise compatibly configured. An EtherChannel will not form with ports that have different GARP VLAN Registration Protocol (GVRP). An EtherChannel supports the same allowed range of VLANs on all the ports in a trunking EtherChannel.3(1). If you disable a port in an EtherChannel. make ports incompatible for the formation of an EtherChannel. and quality of service (QoS) configurations. and Layer 4 port numbers. An EtherChannel will not form if protocol filtering is set differently on the ports. using source addresses or IP addresses or Layer 4 port numbers as the basis for frame distribution may provide better frame distribution than selecting MAC addresses as the basis. Follow these guidelines to avoid configuration problems: • • Assign all ports in an EtherChannel to the same VLAN. IP addresses. Enable all ports in an EtherChannel. EtherChannel Configuration Guidelines If improperly configured. The mode you select applies to all EtherChannels configured on the switch. Ports with different port path costs. by itself. traffic was disrupted when you removed a 1-port channel from spanning tree and then added it to spanning tree as an individual port. the ports do not form an EtherChannel even when set to the auto or desirable mode with the set port channel command. You can specify either source or destination address or both source and destination addresses and Layer 4 port numbers. it is treated as a link failure and its traffic is transferred to one of the remaining ports in the EtherChannel. You cannot enable the port security feature for ports in an EtherChannel.3(1) and later releases. For example. Doing so can adversely affect switch performance. If the allowed range of VLANs is not the same for a port list. An EtherChannel will not form with ports where the port security feature is enabled. Configuring ports in an EtherChannel in different trunk modes can have unexpected results. Do not configure the ports in an EtherChannel as dynamic VLAN ports.Chapter 6 EtherChannel Configuration Guidelines Configuring EtherChannel When configurable. or configure them as trunk ports. Setting different port path costs does not. With software release 6. EtherChannel frame distribution can use MAC addresses. GARP Multicast Registration Protocol (GMRP). • • • • • • • • • • • Catalyst 6000 Family Software Configuration Guide—Releases 6. An EtherChannel will not form if one of the ports is a SPAN destination port. set by the set spantree portcost command.3 and 6.

[admin_group] set port channel mod/port mode {on | off | desirable | auto} [silent | non-silent] This example shows how to set port 2/1 to auto mode: Console> (enable) set port channel 2/1 mode auto Ports 2/1 channel mode set to auto. page 6-ix Configuring an EtherChannel To configure EtherChannel on a group of Ethernet ports. page 6-vi Configuring EtherChannel Frame Distribution. Console> (enable) Setting the EtherChannel Port Mode To set a port’s EtherChannel mode..3 and 6..4 78-13315-02 6-5 .Chapter 6 Configuring EtherChannel Configuring EtherChannel Configuring EtherChannel These sections describe how to configure EtherChannel: • • • • • • • • Configuring an EtherChannel. Ports 2/2-8 joined admin_group 2. page 6-viii Disabling an EtherChannel. page 6-viii Displaying EtherChannel Traffic Utilization. page 6-viii Displaying Outgoing Ports for a Specified Address or Layer 4 Port Number. page 6-vi Setting the EtherChannel VLAN Cost. page 6-v Setting the EtherChannel Port Mode. perform this task in privileged mode: Task Set a port’s EtherChannel mode. perform this task in privileged mode: Task Command Configure the EtherChannel on the desired ports. Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.. [admin_group] set port channel mod/port mode {on | off | desirable | auto} [silent | non-silent] This example shows how to configure a seven-port EtherChannel in a new administrative group: Console> (enable) set port channel 2/2-8 mode desirable Ports 2/2-8 left admin_group 1. set port channel mod/ports. page 6-v Setting the EtherChannel Port Path Cost.. Command set port channel mod/ports.

------------------------------. The command causes a “set spantree portcost” entry to be created for each port in the channel. You enter the set channel vlancost command to set the initial spanning tree costs for all VLANs in the channel.------------------------. it does not appear in the configuration file. some VLANs in the channel can have the “vlancost” while the remaining VLANs in the channel have the “cost. The set channel vlancost command provides an alternate cost for some of the VLANs in the channel (assuming you are trunking across the channel).-------on 768 on 768 Admin Port Device-ID Port-ID Platform group ----.---------20 1/1 notconnect 20 1/2 connected channel group 20 Channel Channel Mode id --------.1/2 port path cost are updated to 31.” Catalyst 6000 Family Software Configuration Guide—Releases 6. Note When you enter the set channel cost command. Channel 768 cost is set to 12.----. Console> (enable) Setting the EtherChannel VLAN Cost The EtherChannel VLAN cost feature provides load balancing of VLAN traffic across multiple channels configured with trunking.---------20 1/1 20 1/2 066510644(cat26-lnf(NET25)) 2/1 WS-C6009 Console> (enable) Console> (enable) set channel cost 768 12 Port(s) 1/1.3 and 6. “Configuring Spanning Tree.” for information on using the set spantree portcost command. Use the EtherChannel ID to set the EtherChannel set channel cost {channel_id | all} cost port path cost. See the “Configuring the PVST+ Port Cost” section in Chapter 8. This example shows how to set the EtherChannel port path cost for channel ID 768: Console> (enable) show Admin Port Status group ----. This command allows you to have up to two different spanning tree costs assigned per channel.----. perform this task in privileged mode: Task Step 1 Step 2 Command show channel group admin_group Use the administrative group number to display the EtherChannel ID.4 6-6 78-13315-02 . Warning:channel cost may not be applicable if channel is broken.Chapter 6 Configuring EtherChannel Configuring EtherChannel Setting the EtherChannel Port Path Cost To set the EtherChannel port path cost.

Use the EtherChannel ID to set the EtherChannel set channel vlancost channel_id cost VLAN cost. Port 3/47 VLANs 1-1005 have path cost 16. Channel 856 vlancost is set to 10.------------------------. Port 3/48 VLANs 1-1005 have path cost 16. Console> (enable) set spantree portvlancost 3/47 cost 16 1-1005 Port 3/47 VLANs 1025-4094 have path cost 19. Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. specifying the VLAN or VLANs that you want associated with each port.---------22 1/1 notconnect 22 1/2 connected channel group 22 Channel Channel Mode id --------. To set the EtherChannel VLAN cost. perform this task in privileged mode: Task Step 1 Step 2 Step 3 Command show channel group admin_group Use the administrative group number to display the EtherChannel ID.----.---------22 1/1 22 1/2 066510644(cat26-lnf(NET25)) 2/1 WS-C6009 Console> (enable) Console> (enable) set channel vlancost 856 10 Port(s) 3/47-48 vlan cost are updated to 16. you must enter the set spantree portvlancost command for at least one port in the channel. The following commands are added to the configuration file: • • set spantree portvlancost 3/47 cost 16 set spantree portvlancost 3/48 cost 16 Now you have to add the desired VLANs to the above created commands by entering the following: Console> (enable) set spantree portvlancost 3/47 cost 16 1-1005 Port 3/47 VLANs 1025-4094 have path cost 19. Port 3/47 VLANs 1-1005 have path cost 16.3 and 6.------------------------------.----. Port 3/48 VLANs 1-1005 have path cost 16.4 78-13315-02 6-7 . Once you have entered the set channel vlancost command. The following examples show what occurs when each command is entered: Console> (enable) set channel vlancost 856 10 Port(s) 3/47-48 vlan cost are updated to 16.-------on 856 on 856 Admin Port Device-ID Port-ID Platform group ----. Configure the port cost for the desired VLANs on set spantree portvlancost {mod/port} [cost cost] each port. Channel 856 vlancost is set to 10. [vlan_list] This example shows how to set the EtherChannel VLAN cost for channel ID 856: Console> (enable) show Admin Port Status group ----.Chapter 6 Configuring EtherChannel Configuring EtherChannel The set channel vlancost command creates a “set spantree portvlancost” entry to the configuration file for each port in the channel.

------. [dest_ip_addr] | dest_ip_address | src_mac_addr [dest_mac_addr] | dest_mac_addr | src_port dest_port Catalyst 6000 Family Software Configuration Guide—Releases 6.00% 0.00% 25.00% 50.00% 25.------.Chapter 6 Configuring EtherChannel Configuring EtherChannel Configuring EtherChannel Frame Distribution To configure EtherChannel frame distribution.00% 75.00% 0.------.25% 0.00% 0. Command set port channel all distribution {ip | mac} [source | destination | both] set port channel all distribution {session} [both] Note The set port channel all distribution session command option is supported on Supervisor Engine 2 only.00% 50.00% 808 2/17 0.50% 0.3 and 6. This example shows how to configure EtherChannel to use MAC source addresses: Console> (enable) set port channel all distribution mac source Channel distribution is set to mac source.----.25% 50. perform this task in privileged mode: Task Display traffic utilization.00% 816 2/32 0. perform this task in privileged mode: Task Command Display the outgoing port for a specified show channel hash channel_id src_ip_addr address or Layer 4 port number.------. perform this task in privileged mode: Task Configure EtherChannel frame distribution.4 6-8 78-13315-02 .00% 0.00% 0.00% 75.00% 816 2/31 0.75% 50.00% Console> (enable) Displaying Outgoing Ports for a Specified Address or Layer 4 Port Number To display the outgoing port used in an EtherChannel for a specific address or Layer 4 port number. Console> (enable) Displaying EtherChannel Traffic Utilization To display the traffic utilization on the EtherChannel ports. Command show channel traffic This example shows how to display traffic utilization on EtherChannel ports: Console> (enable) show channel traffic ChanId Port Rx-Ucst Tx-Ucst Rx-Mcst Tx-Mcst Rx-Bcst Tx-Bcst -----.00% 0.00% 0.75% 0.00% 0.------.50% 0.------808 2/16 0.

Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.20.4 78-13315-02 6-9 .3 and 6.Chapter 6 Configuring EtherChannel Configuring EtherChannel This example shows how to display the outgoing port for the specified source and destination IP addresses: Console> (enable) show channel hash 808 172.66 Selected channel port:2/17 Console> (enable) Disabling an EtherChannel To disable an EtherChannel.32.10 172. Command set port channel mod/port mode off This example shows how to disable an EtherChannel: Console> (enable) set port channel 2/2-8 mode off Ports 2/2-8 channel mode set to off.32.20. perform this task in privileged mode: Task Disable an EtherChannel.

4 6-10 78-13315-02 .Chapter 6 Configuring EtherChannel Configuring EtherChannel Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.

1Q Tunneling This chapter describes how to configure IEEE 802. A VLAN carrying tunnel traffic is an 802.1Q trunk port on a customer device and enters the switch through a tunnel port.1Q tunneling is called a tunnel port. it does not strip the received 802.1Q Tunneling Works 802. is called tunnel traffic.1Q tunneling on the Catalyst 6000 family switches.1Q tag intact. Catalyst 6000 Family Software Configuration Guide—Releases 6. The link between the 802. instead. To keep customer traffic segregated. This Ethertype 0x8100 traffic.1Q Tunneling.1Q tag intact. the tunnel port leaves the 802.1Q trunk port and the other end is configured as a tunnel port. with the received 802.1Q Tunneling Configuration Guidelines.1Q tunneling.C H A P T E R 7 Configuring IEEE 802. but that one VLAN supports all of the customer’s VLANs.1Q trunk port on the customer device strips the 802. This chapter consists of these sections: • • • Understanding How 802.1Q Tunneling Works.1Q tag still intact to an 802. adds a 1-byte Ethertype field (0x8100) and a 1-byte length field and puts the received customer traffic into the VLAN to which the tunnel port is assigned. A tunnel can have as many tunnel ports as required to support the customer devices that need to communicate through the tunnel.1Q trunk port on a customer device. The tunnel ports in the VLAN are the tunnel’s ingress and egress points.1Q trunk port on a customer device and the tunnel port is called an asymmetrical link because one end is configured as an 802.1Q tag from the frame header. you assign a tunnel port to a VLAN that you dedicate to tunneling.4 78-13315-02 7-1 . each customer requires a separate VLAN.1Q tag and puts the traffic into the appropriate customer VLAN. page 7-i 802. page 7-iii Understanding How 802.1Q tunneling enables service providers to use a single VLAN to support customers who have multiple VLANs. tagged traffic comes from an 802. The 802. With 802.1Q trunk port.1Q tunnel. A port configured to support 802. An egress tunnel port strips the 1-byte Ethertype field (0x8100) and the 1-byte length field and transmits the traffic with the 802. The tunnel can cross other network links and other network devices before reaching the egress tunnel port. while preserving customer VLAN IDs and keeping traffic in different customer VLANs segregated.3 and 6. page 7-ii Configuring Support for 802. When you configure tunneling. When a tunnel port receives tagged customer traffic from an 802. The tunnel ports do not have to be on the same network device.

Because traffic in the native VLAN is untagged. Ignore the messages if your configuration requires nonmatching VLANs. Jumbo frames can be tunneled as long as the jumbo frame length combined with the 802. it cannot be tunneled correctly. Ensure that the native VLAN of the 802.1Q trunk port on an asymmetrical link with the nonegotiate dot1q trunking keywords.1Q trunk.1Q trunk port in an asymmetrical link carries no traffic.1Q Tunneling Configuration Guidelines Follow these guidelines when configuring 802.3 and 6. Layer 3 • • destination and source addresses). Configure tunnel ports only to form an asymmetrical link. Assign only tunnel ports to VLANs used for tunneling.1Q tag does not exceed the maximum frame size. – Tunnel traffic cannot be routed.1Q tag within the switch.1Q Tunneling 802. On an asymmetrical link.Chapter 7 802. Dedicate one VLAN for each tunnel. the Cisco Discovery Protocol (CDP) reports a native VLAN mismatch if the VLAN of the tunnel port does not match the native VLAN of the 802.1Q trunks requires that you be very careful when you configure tunneling: a mistake might direct tunnel traffic to a non-tunnel port. Configure the 802.1Q tags. using 802.1Q tunnel feature does not require that the VLANs match. • Asymmetrical links do not support the Dynamic Trunking Protocol (DTP). Trunks require no special configuration to carry tunnel VLANs. We recommend that you use ISL trunks to carry tunnel traffic between devices that do not have tunnel ports.1Q tunneling in your network: • • • • • • Use asymmetrical links to put traffic into a tunnel or to remove traffic from a tunnel. – The switch can filter tunnel traffic using only Layer 2 parameters (VLANs and source and destination MAC addresses). Because tunnel traffic retains the 802. the Layer 2 frame header length imposes the following restrictions: – The Layer 3 packet within the Layer 2 frame cannot be identified. – QoS cannot detect the received CoS value in the 802. The 802.4 7-2 78-13315-02 . Because of the 802.1Q native VLAN feature.1Q tunneling feature cannot be configured on ports configured to support: – Private VLANs – Voice over IP (Cisco IP Phone 7960) • • • • The following Layer 2 protocols work between devices connected by an asymmetrical link: – CDP – UniDirectional Link Detection (UDLD) – Port Aggregation Protocol (PAgP) Catalyst 6000 Family Software Configuration Guide—Releases 6. The 802.1Q Tunneling Configuration Guidelines Configuring IEEE 802. You must enter the global set dot1q-all-tagged enable command to ensure that egress traffic in the native VLAN is tagged with 802. because only one port on the link is a trunk. – The switch can provide only MAC-layer QoS for tunnel traffic.1Q 2-byte Tag Control Information field. – Layer 3 and higher parameters are not identifiable in tunnel traffic (for example.

1Q tunneling configuration: • • • • Configuring the Switch to Support 802.1Q Tunneling Configuring Support for 802. perform this task in privileged mode: Task Step 1 Step 2 Command set dot1q-all-tagged enable [all] show dot1q-all-tagged Configure tunneling support on the switch. • Configuring Support for 802. page 7-iii Configuring 802. Incorrect assignment of tunnel ports to VLANs can forward traffic inappropriately.1Q Tunneling The set dot1q-all-tagged enable command is a global command that configures a switch to forward all frames from 802. Configuring the Switch to Support 802.1Q tunneling with 802.1Q trunks with 802.1Q tunneling. An interconnected network may have redundant paths to the same edge switch in an ISP.Chapter 7 Configuring IEEE 802. page 7-iv Clearing 802. Since the Layer 3 packet within the Layer 2 frame cannot be identified.1Q Tunneling.1Q tagged frames on 802. including traffic in the native VLAN.1Q Tunneling • VLAN Trunk Protocol (VTP) does not work between the following devices: – Devices connected by an asymmetrical link – Devices communicating through a tunnel Note To configure an EtherChannel as an asymmetrical link. page 7-v Caution Ensure that only the appropriate tunnel ports are in any VLAN used for tunneling and that one VLAN is used for each tunnel.1Q tagging. but the customer network must use Per VLAN Spanning Tree + (PVST+) and cannot be configured for Multi-Instance Spanning Tree Protocol (MISTP). Catalyst 6000 Family Software Configuration Guide—Releases 6. page 7-iv Removing Global Support for 802.1Q Tunnel Ports. The ISP infrastructure must use either PVST+ or MISTP-PVST+. but does not work between devices connected by an asymmetrical link. Verify the configuration.3 and 6. You can enter this command on any switch that needs to support 802.1Q trunks.4 78-13315-02 7-3 .1Q Tunneling These sections describe 802. including untagged traffic in the native VLAN.1Q trunks. all ports in the EtherChannel must have the same tunneling configuration. • Generic Attribute Registration Protocol (GARP) VLAN Registration Protocol (GVRP) works between devices communicating through a tunnel. and admit only 802.1Q Tunneling. configure the EtherChannel to use MAC-address-based frame distribution. To configure the switch to support 802. An interconnected network cannot have redundant paths to two different edge switches in an ISP. dropping any untagged traffic.1Q Tunnel Ports.

1Q Tunneling Configuring IEEE 802.3 and 6. Verify the configuration. Verify the configuration. Port 4/1 trunk mode set to off. perform this task in privileged mode: Task Step 1 Step 2 Command set port dot1qtunnel {mod/port} access show port dot1qtunnel [mod[/port]] Configure tunneling on a port. Console> (enable) show port dot1qtunnel 4/1 Port Dot1q tunnel mode ----.1Q Tunnel Ports To clear 802. This example shows how to clear tunneling on port 4/1 and verify the configuration: Console> (enable) set port dot1qtunnel 4/1 disable Dot1q tunnel feature disabled on port 4/1. perform this task in privileged mode: Task Step 1 Step 2 Command set port dot1qtunnel {mod/port} disable show port dot1qtunnel [mod[/port]] Clear tunneling from a port.1Q Tunneling You do not need to enter the set dot1q-all-tagged disable command to clear 802.1Q tunneling support from a port.1Q tunneling.1Q Tunneling This example shows how to configure tunneling on the switch and verify the configuration: Console> (enable) set dot1q-all-tagged enable Dot1q tagging is enabled Console> (enable) show dot1q-all-tagged Dot1q all tagged mode enabled Console> (enable) Configuring 802. The set port dot1qtunnel disable command is the only command required to clear the feature from the port.----------------4/1 access Clearing 802.1Q Tunnel Ports To configure 802.Chapter 7 Configuring Support for 802. Console> (enable) show port dot1qtunnel 4/1 Port Dot1q tunnel mode ----.1Q tunneling on a port.----------------4/1 disabled Removing Global Support for 802. Catalyst 6000 Family Software Configuration Guide—Releases 6. This example shows how to configure tunneling on port 4/1 and verify the configuration: Console> (enable) set port dot1qtunnel 4/1 access Dot1q tunnel feature set to access mode on port 4/1.4 7-4 78-13315-02 .

1Q Tunneling To remove global support for 802.4 78-13315-02 7-5 . This example shows how to remove tunneling support on the switch and verify the configuration: Console> (enable) set dot1q-all-tagged disable Dot1q tagging is disabled Console> (enable) show dot1q-all-tagged Dot1q all tagged mode disabled Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.Chapter 7 Configuring IEEE 802.1Q Tunneling Configuring Support for 802. perform this task in privileged mode: Task Step 1 Step 2 Command set dot1q-all-tagged disable [all] show dot1q-all-tagged Remove tunneling support on the switch. Verify the configuration.1Q tunneling on the switch.3 and 6.

1Q Tunneling Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.1Q Tunneling Configuring IEEE 802.Chapter 7 Configuring Support for 802.4 7-6 78-13315-02 .

page 8-xxxviii Note For complete syntax and usage information for the commands used in this chapter. and Loop Guard.1D bridge Spanning Tree Protocol (STP) and how to use and configure Cisco’s proprietary spanning tree protocols.3 and 6. are based on IEEE 802. (See the “Understanding PVST+ and MISTP Modes” section on page 8-xi for information about PVST+ and MISTP. page 8-xxii Configuring a Root Switch. Per VLAN Spanning Tree + (PVST+) and Multi-Instance Spanning Tree Protocol (MISTP). page 8-xiii Using PVST+. page 8-xi Bridge Identifiers.” This chapter consists of these sections: • • • • • • • • • Understanding How Spanning Tree Protocols Work. Note For information on configuring the spanning tree PortFast.1D STP is a Layer 2 management protocol that provides path redundancy in a network while preventing undesirable loops. UplinkFast. refer to the Catalyst 6000 Family Command Reference publication. All spanning tree protocols use an algorithm that calculates the best loop-free path through the network. page 8-xv Using MISTP-PVST+ or MISTP.1D STP.) The 802. Understanding How Spanning Tree Protocols Work This section describes the specific functions that are common to all spanning tree protocols. page 8-xxxvii Configuring BPDU Skewing. see Chapter 9. PVST+ and MISTP. page 8-i Understanding PVST+ and MISTP Modes. page 8-xxxi Configuring Spanning Tree Timers. Catalyst 6000 Family Software Configuration Guide—Releases 6. BackboneFast. Cisco’s proprietary spanning tree protocols.C H A P T E R 8 Configuring Spanning Tree This chapter describes the IEEE 802. and BackboneFast features. on the Catalyst 6000 family switches.4 78-13315-02 8-1 . “Configuring Spanning Tree PortFast. page 8-xxxv Understanding How BPDU Skewing Works. UplinkFast.

only one active path may exist between any two stations. Port roles are as follows: • • • • Root—A unique forwarding port elected for the spanning tree topology Designated—A forwarding port elected for every switched LAN segment Alternate—A blocked port providing an alternate path to the root port in the spanning tree Backup—A blocked port in a loopback configuration Switches that have ports with these assigned roles are called root or designated switches. all paths that are not needed to reach the root switch from anywhere in the switched network are placed in STP-blocked mode.Chapter 8 Understanding How Spanning Tree Protocols Work Configuring Spanning Tree The Spanning Tree Protocol (STP) uses a distributed algorithm that selects one bridge of a redundantly connected network as the root of a spanning tree connected active topology. This situation causes the forwarding algorithm to malfunction allowing duplicate frames to be forwarded. This exchange of messages results in the following actions: • • • A unique root switch is elected for the spanning tree network topology A designated switch is elected for every switched LAN segment Any loops in the switched network are eliminated by placing redundant switch ports in a backup state. These sections describe the STP: • • • • • Understanding How a Topology is Created. the spanning tree algorithm reconfigures the spanning tree topology and reestablishes the link by activating the standby path. At regular intervals. page 8-iii Calculating and Assigning Port Costs.3 and 6. Multiple active paths between stations can cause loops in the network. In Ethernet networks. some switches recognize stations on both sides of the switch. page 8-iv Spanning Tree Port States. which do not detect whether they are connected to a single LAN segment or a switched LAN of multiple segments.4 8-2 78-13315-02 . the switches in the network send and receive spanning tree packets that they use to identify the path. see the “Understanding How a Switch Becomes the Root Switch” section on page 8-iii. Spanning tree operation is transparent to end stations. The topology of an active switched network is determined by the following: • • • The unique switch identifier Media Access Control ([MAC] address of the switch) associated with each switch The path cost to the root associated with each switch port The port identifier (MAC address of the port) associated with each switch port Catalyst 6000 Family Software Configuration Guide—Releases 6. STP assigns roles to each port depending on what the port’s function is in the active topology. For more information. When loops occur. page 8-v Understanding How a Topology is Created All switches in an extended LAN participating in a spanning tree gather information about other switches in the network through an exchange of data messages known as bridge protocol data units (BPDUs). page 8-ii Understanding How a Switch Becomes the Root Switch. or if spanning tree costs change. Spanning tree algorithms provide path redundancy by defining a tree that spans all of the switches in an extended network and then forces certain redundant data paths into a standby (blocked) state. If one network segment becomes unreachable. page 8-iii Understanding How Bridge Protocol Data Units Work.

Switch A is the root switch because it has the lowest MAC address. including switch and port MAC addresses. the path between source and destination stations in a switched network might not be ideal. lowering the numerical priority number) on the preferred switch. the root switch is the logical center of the spanning tree topology. or line types. and port cost. Also. Switch A might not be the ideal root switch. For example. Understanding How a Switch Becomes the Root Switch If all switches are enabled with default settings. as well as the root port and designated port for each switched segment. the switch with the lowest MAC address in the network becomes the root switch. switch priority. Figure 8-1 DP DP DP RP B A DP RP D DP DP Configuring a Loop-Free Topology RP C DP S5688 RP = Root Port DP = Designated Port You can change the priority of a port to make it the root port. The goal is to make the fastest link the root port. However. A switch can be forced to become the root switch by increasing the priority (that is. In Figure 1. A spanning tree protocol uses BPDUs to elect the root switch and root port for the switched network. due to traffic patterns.3 and 6. number of forwarding ports. When the spanning tree topology is based on default parameters. Each configuration BPDU contains this information: • • • The unique identifier of the switch that the transmitting switch believes to be the root switch The cost of the path to the root from the transmitting port The identifier of the transmitting port Catalyst 6000 Family Software Configuration Guide—Releases 6. Connecting higher-speed links to a port that has a higher number than the current root port can cause a root-port change. By changing the Port Priority parameter for the UTP port to a higher priority (lower numerical value) than the fiber-optic port. Network traffic might be more efficient over the high-speed fiber-optic link. You could also accomplish this scenario by changing the Port Cost parameter for the UTP port to a lower value than that of the fiber-optic port. assume that a port on Switch B is a fiber-optic link. Understanding How Bridge Protocol Data Units Work BPDUs contain configuration information about the transmitting switch and its ports.4 78-13315-02 8-3 . port priority. This action causes the spanning tree to recalculate the topology and make the selected switch the root switch.Chapter 8 Configuring Spanning Tree Understanding How Spanning Tree Protocols Work In a switched network. another port on Switch B (an unshielded twisted-pair [UTP] link) is the root port. the UTP port becomes the root port.

4 8-4 78-13315-02 . The long method uses a 32-bit format that yields values in the range of 1 to 200. see the “Configuring the PVST+ Default Port Cost Mode” section on page 8-xviii Note You should configure all switches in your network to use the same method for calculating port cost.Chapter 8 Understanding How Spanning Tree Protocols Work Configuring Spanning Tree The switch sends configuration BPDUs to communicate and compute the spanning tree topology.1D specification assigns 16-bit (short) default port cost values to each port based on bandwidth. You can calculate and assign lower path cost values (port costs) to higher bandwidth ports by using either the short method (which is the default) or the long method. but the receiving switch uses the information in the frame to calculate a BPDU. you can ensure that the shortest (lowest cost) distance to the root switch is used to transmit data. Calculating and Assigning Port Costs By calculating and assigning the port cost of the switch ports. initiates a BPDU transmission. For steps for setting the default cost mode.000. You can specify the calculation method using the CLI. The short method uses a 16-bit format that yields values from 1 to 65535. The 16-bit values are only used for ports that have not been specifically configured for port cost. Ports included in the STP are selected. A port for each switch is selected. Two methods are available for calculating the default port cost: the short method and the long method. Table 8-1 Default Port Cost Values Using the Short Method Port Speed 10 Mbps 100 Mbps 1 Gbps Default Cost Value 100 19 4 Default Range 1 to 65535 1 to 65535 1 to 65535 Catalyst 6000 Family Software Configuration Guide—Releases 6. This is the switch that is closest to the root switch through which frames will be forwarded to the root. This is the port that provides the best path from the switch to the root switch. A BPDU exchange results in the following: • • • • • One switch is elected as the root switch. A MAC frame conveying a BPDU sends the switch group address to the destination address field.3 and 6. All switches connected to the LAN on which the frame is transmitted receive the BPDU. and if the topology changes. You can also manually assign port costs between 1 and 65535.000. BPDUs are not directly forwarded by the switch. Table 8-1 shows the default port cost values that are assigned by the switch for each type of port when you use the short method to calculate the port cost. A designated switch is selected. The short method is used to calculate the port cost unless you specify that the long method be used. The shortest distance to the root switch is calculated for each switch. Calculating the Port Cost Using the Short Method The IEEE 802.

Learning the entries immediately following a topology change prevents excessive flooding later. they must allow the frame lifetime to expire for frames that have been forwarded using the old topology. if a 10-Mbps link were removed from a 10-Gbps aggregate link). Because of the limitations presented by automatically recalculating the topology. The feature causes the MSFC to send ARP requests for all the ARP entries belonging to the VLAN interface where the TCN is received.4(2) or later releases. the Policy Feature Card (PFC) learns the MAC entries.000. Also.1.(1)E or later releases on the Multilayer Switch Feature Card (MSFC).000. When the ARP replies come back. Table 8-1 shows the default port cost values that are assigned by the switch and the recommended cost values and ranges for each type of port when you use the long method to calculate port cost.1t states that changes in bandwidth will not result in changes to the cost of the port concerned. the bandwidth of the aggregate link increases or decreases. Note With IOS Release 12. The aggregated port will therefore use the same port cost parameters as a stand alone port. especially if the added or removed link is of little consequence to the bandwidth of the aggregate link (for example. When a switch port transitions directly from nonparticipation in the topology to the forwarding state.1t assigns 32-bit (long) default port cost values to each port using a formula that is based on the bandwidth of the port.Chapter 8 Configuring Spanning Tree Understanding How Spanning Tree Protocols Work Calculating the Port Cost Using the Long Method 802. This feature works with supervisor engine software release 5.3 and 6. There is no configuration required on the MSFC. Table 8-2 Default Port Cost Values Using the Long Method Port Speed ≤100 kbps 1 Mbps 10 Mbps 100 Mbps 1 Gbps 10 Gbps Recommended Value 200000000 20000000 2000000 200000 20000 2000 Recommended Range 20000000 to 200000000 2000000 to 200000000 200000 to 20000000 20000 to 2000000 2000 to 200000 200 to 20000 Available Range 1 to 200000000 1 to 200000000 1 to 200000000 1 to 200000000 1 to 200000000 1 to 200000000 Calculating the Port Cost for Aggregate Links • As individual links are added or removed from an aggregate link (port bundle). Catalyst 6000 Family Software Configuration Guide—Releases 6.4 78-13315-02 8-5 . it can create temporary data loops.000. the Address Resolution Protocol (ARP) on the STP Topology Change Notification feature ensures that excessive flooding does not occur when the MSFC receives a topology change notification (TCN) from the supervisor engine. You can also manually assign port costs between 1 and 200. These changes in bandwidth lead to recalculation of the default port cost for the aggregated port. The formula for obtaining default 32-bit port costs is to divide the bandwidth of the port by 200. Changes to the default port cost or changes resulting from links that autonegotiate their bandwidth could lead to recalculation of the spanning tree topology which may not be desirable. Spanning Tree Port States Topology changes can take place in a switched network due to a link coming up or a link going down (failing). 802. Ports must wait for new topology information to propagate through the switches in the LAN before they can start forwarding frames.000. which were lost as a result of the topology change.

When the spanning tree algorithm places a port in the forwarding state. Catalyst 6000 Family Software Configuration Guide—Releases 6. The expiration of a protocol timer moves the port to the forwarding state. The port waits for the expiration of a protocol timer that moves the port to the learning state. every switch in the network goes through the blocking state and the transitory states of listening and learning at power up. each port on a switch using a spanning tree protocol is in one of these states: • • • • • Blocking Listening Learning Forwarding Disabled A port moves through these states as follows: • • • • • From initialization to blocking From blocking to listening or to disabled From listening to learning or to disabled From learning to forwarding or to disabled From forwarding to disabled Figure 2 illustrates how a port moves through the states. Figure 8-2 Boot-up initialization STP Port States Blocking state Listening state Disabled state Learning state You can modify each port state by using management software. the following occurs: • • • • The port is put into the listening state while it waits for protocol information that suggests it should go to the blocking state. In the learning state. the port continues to block frame forwarding as it learns station location information for the forwarding database. for example.Chapter 8 Understanding How Spanning Tree Protocols Work Configuring Spanning Tree At any given time.3 and 6.4 8-6 S5691 Forwarding state 78-13315-02 . If properly configured. VLAN Trunking Protocol (VTP). where both learning and forwarding are enabled. each port stabilizes into the forwarding or blocking state. When you enable spanning tree.

) Receives BPDUs and directs them to the system module. a BPDU is sent to each port in the switch. Discards frames switched from another port for forwarding. After initialization.3 and 6. Learning is disabled in the listening state. Listening State The listening state is the first transitional state a port enters after the blocking state. This exchange establishes which switch in the network is really the root. The port enters this state when the spanning tree determines that the port should participate in frame forwarding. so there is no address database update. and the ports move to the listening state. If only one switch resides in the network. Receives and responds to network management messages. A switch initially assumes it is the root until it exchanges BPDUs with other switches. (There is no learning on a blocking port.4 78-13315-02 8-7 .Chapter 8 Configuring Spanning Tree Understanding How Spanning Tree Protocols Work Blocking State A port in the blocking state does not participate in frame forwarding (see Figure 3). Does not transmit BPDUs received from the system module. Catalyst 6000 Family Software Configuration Guide—Releases 6. the forward delay timer expires. A switch always enters the blocking state following switch initialization. no exchange occurs. Does not incorporate station location into its address database. Figure 4 shows a port in the listening state. Figure 8-3 Port 2 in Blocking State Segment frames Forwarding Port 1 Station addresses Network management and data frames BPDUs Filtering database System module Frame forwarding BPDUs Network management frames S5692 Data frames Port 2 Blocking Segment frames A port in the blocking state performs as follows: • • • • • • Discards frames received from the attached segment.

3 and 6. Incorporates station location into its address database. The port enters the learning state from the listening state. Discards frames switched from another port for forwarding. Learning State A port in the learning state prepares to participate in frame forwarding. Does not incorporate station location into its address database. A port in the learning state performs as follows: • • • • Discards frames received from the attached segment. Catalyst 6000 Family Software Configuration Guide—Releases 6.) Receives BPDUs and directs them to the system module. Figure 5 shows a port in the learning state.Chapter 8 Understanding How Spanning Tree Protocols Work Configuring Spanning Tree Figure 8-4 Port 2 in Listening State All segment frames Forwarding Port 1 Station addresses Network management and data frames BPDUs Filtering database System module Frame forwarding BPDUs Data frames Port 2 Network management frames S5693 Listening All segment frames BPDU and network management frames A port in the listening state performs as follows: • • • • • • Discards frames received from the attached segment. (There is no learning at this point. Receives BPDUs and directs them to the system module.4 8-8 78-13315-02 . Discards frames switched from another port for forwarding. Processes BPDUs received from the system module. so there is no address database update. Receives and responds to network management messages.

processes.4 78-13315-02 8-9 . Receives and responds to network management messages. and transmits BPDUs received from the system module.Chapter 8 Configuring Spanning Tree Understanding How Spanning Tree Protocols Work • • Receives. Port 2 in Learning State Figure 8-5 All segment frames Forwarding Port 1 Station addresses Network management and data frames BPDUs Filtering database System module Frame forwarding Station addresses Data frames BPDUs Network management frames S5694 Port 2 Learning All segment frames BPDU and network management frames Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.

Processes BPDUs received from the system module. BackboneFast.3 and 6. Forwards frames switched from another port for forwarding. For more information about PortFast. The port enters the forwarding state from the learning state.Chapter 8 Understanding How Spanning Tree Protocols Work Configuring Spanning Tree Forwarding State A port in the forwarding state forwards frames. Receives BPDUs and directs them to the system module. enable spanning tree on ports connected to switches or other devices that forward messages. instead of having to go through the entire spanning tree initialization process. “Configuring Spanning Tree PortFast. and Loop Guard. see Chapter 9. UplinkFast.4 8-10 78-13315-02 . Caution Use spanning tree PortFast mode only on ports directly connected to individual workstations to allow these ports to come up and go directly to the forwarding state. Receives and responds to network management messages. Figure 8-6 Port 2 in Forwarding State All segment frames Forwarding Port 1 Station addresses Network management and data frames BPDUs Filtering database System module Frame forwarding Station addresses BPDUs Network management and data frames S5695 Port 2 Forwarding All segment frames A port in the forwarding state performs as follows: • • • • • • Forwards frames received from the attached segment.” Catalyst 6000 Family Software Configuration Guide—Releases 6. as shown in Figure 6. To prevent illegal topologies. Incorporates station location information into its address database.

Does not receive BPDUs for transmission from the system module. (There is no learning. as shown in Figure 7. so there is no address database update. Understanding PVST+ and MISTP Modes Catalyst 6000 family switches provide two proprietary spanning tree modes based on the IEEE 802. Does not incorporate station location into its address database. Figure 8-7 Port 2 in Disabled State All segment frames Forwarding Port 1 Station addresses Network management and data frames BPDUs Filtering database System module Frame forwarding Network management frames Port 2 S5696 Data frames Disabled All segment frames A disabled port performs as follows: • • • • • • Discards frames received from the attached segment.4 78-13315-02 8-11 . Discards frames switched from another port for forwarding. A port in the disabled state is virtually nonoperational.Chapter 8 Configuring Spanning Tree Understanding PVST+ and MISTP Modes Disabled State A port in the disabled state does not participate in frame forwarding or STP.) Receives BPDUs but does not direct them to the system module.3 and 6. Receives and responds to network management messages.1D standard and one mode that is a combination of the two modes: • • • Per VLAN Spanning Tree (PVST+) Multi-Instance Spanning Tree Protocol (MISTP) MISTP-PVST+ (combination mode) Catalyst 6000 Family Software Configuration Guide—Releases 6.

Each MISTP instance root switch propagates the information associated with it to all other switches in the network. PVST+ Mode PVST+ is the default spanning tree protocol used on all Ethernet. MISTP allows you to group multiple VLANs under a single instance of spanning tree (an MISTP instance). An MISTP instance can have any number of VLANs mapped to it. MISTP discards PVST+ BPDUs. An MISTP instance is a virtual logical topology defined by a set of bridge and port parameters. but a VLAN can be mapped only to a single MISTP instance.1Q. Each PVST+ instance on a VLAN has a single root switch. if ports are added at the same time the VLAN is moved. that is. MISTP networks converge faster with less overhead.) Catalyst 6000 Family Software Configuration Guide—Releases 6. you must first enable MISTP-PVST+ on the switch and configure an MISTP instance to avoid causing loops in the network. MISTP builds MISTP instances by exchanging MISTP BPDUs with peer entities in the network. MISTP combines the Layer 2 load-balancing benefits of PVST+ with the lower CPU load of IEEE 802. MISTP Mode MISTP is an optional spanning tree protocol that runs on Catalyst 6000 family switches. Fast Ethernet. rather than one for each VLAN. You can easily move a VLAN (or VLANs) in an MISTP topology to another MISTP instance if it has converged. page 8-xv Using MISTP-PVST+ or MISTP. Each MISTP instance has its own root switch and a different set of forwarding links. PVST+ provides Layer 2 load balancing for the VLAN on which it runs. MISTP uses one BPDU for each MISTP instance. different bridge and port parameters. this virtual logical topology becomes a physical topology. page 8-xxii Caution If your network currently uses PVST+ and you plan to use MISTP on any switch. This process ensures that the network topology is maintained because each switch has the same knowledge about the network. PVST+ runs on each VLAN on the switch. This process maintains the network topology because it ensures that each switch has the same information about the network. (However.4 8-12 78-13315-02 . This root switch propagates the spanning tree information associated with that VLAN to all other switches in the network. ensuring that each VLAN has a loop-free path through the network. When you map VLANs to an MISTP instance. Because there are fewer BPDUs in an MISTP network.Chapter 8 Understanding PVST+ and MISTP Modes Configuring Spanning Tree An overview of each mode is provided in this section. as in PVST+. you can create different logical topologies using the VLANs on your network to ensure that all the links are used and no link is oversubscribed. convergence time is required.3 and 6. Each mode is described in detail in these sections: • • Using PVST+. and Gigabit Ethernet port-based VLANs on Catalyst 6000 family switches.

the bridge identifier stored in the spanning tree BPDU contains an additional field called the system ID extension. the VLAN 3 bridge ID is 00-e0-1e-9b-2e-02. because VLANs running under PVST+ and MISTP instances running under MISTP-PVST+ or MISTP are considered logical bridges. page 8-xiii MAC Address Reduction. and the system ID extension for MISTP instance 2 is 2. To convert your network to MISTP. For example. MISTP-PVST+ allows interoperability between PVST+ and pure MISTP because it sees the BPDUs of both modes. MAC addresses are allocated sequentially.4 78-13315-02 8-13 . Catalyst 6000 Family Software Configuration Guide—Releases 6.Chapter 8 Configuring Spanning Tree Bridge Identifiers MISTP-PVST+ Mode MISTP-PVST+ is a transition spanning tree mode that allows you to use the MISTP functionality on Catalyst 6000 family switches while continuing to communicate with Catalyst 5000 and 6000 switches in your network that use PVST+. each bridge must have its own unique identifier in the network. The system ID extension is always the number of the VLAN or the MISTP instance. if the MAC address range is 00-e0-1e-9b-2e-00 to 00-e0-1e-9b-31-ff. use MISTP-PVST+ to transition the network from PVST+ to MISTP. the VLAN 1 bridge ID is 00-e0-1e-9b-2e-00. a condition that can cause loops in the network. and so on. When you enable MAC address reduction. You can use the show module command to view the MAC address range. The last MAC address in the range is assigned to the supervisor engine in-band (sc0) management interface. the system ID extension for VLAN 100 is 100. Combined with the bridge priority. with the first MAC address in the range assigned to VLAN 1. the VLAN 2 bridge ID is 00-e0-1e-9b-2e-01. the system ID extension functions as the unique identifier for a VLAN or an MISTP instance. you cannot configure more VLAN ports on your MISTP-PVST+ switches than on your PVST+ switches.3 and 6. However. page 8-xiii MAC Address Allocation Catalyst 6000 family switches have a pool of 1024 MAC addresses that can be used as bridge identifiers for VLANs running under PVST+ or for MISTP instances. for example. The in-band (sc0) interface MAC address is 00-e0-1e-9b-31-ff. Because MISTP-PVST+ conforms to the limits of PVST+. Bridge Identifiers These sections explain how MAC addresses are used in PVST+ and MISTP as unique bridge identifiers: • • MAC Address Allocation. and so forth. MAC address reduction allows up to 4096 VLANs running under PVST+ or 16 MISTP instances to have unique identifiers without increasing the number of MAC addresses required on the switch. the second MAC address in the range assigned to VLAN 2. A switch using PVST+ mode that is connected to a switch using MISTP mode cannot see the BPDUs of the other switch. MAC Address Reduction For Catalyst family switches that support 4096 VLANs. MAC address reduction reduces the number of MAC addresses required by the STP from one per VLAN or MISTP instance to one per switch.

3 and 6. Note The MAC address reduction feature is enabled by default on Cisco switches that have 64 MAC addresses (Cisco 7606. Therefore. 45056. When MAC address reduction is enabled. the root bridge priority becomes a multiple of 4096 plus the VLAN ID. 12 bits MAC Address 6 bytes When you enter a show spantree command. WS-C6503. Figure 8-8 Bridge Identifier without MAC Address Reduction Figure 9 shows the bridge identifier when you enable MAC address reduction. 40960. . 24576. the system ID extension. 8192. Console> (enable) show spantree 1 VLAN 1 Spanning tree mode PVST+ Spanning tree type ieee . it could claim and win root bridge ownership because of the finer granularity in the selection of its bridge ID. and 61440. a switch bridge ID (used by the spanning-tree algorithm to determine the identity of the root bridge. Only the following values are possible: 0. and WS-C6513). The bridge identifier consists of the bridge priority and the MAC address. The unique identifier for this VLAN is 32769. and the MAC address. Catalyst 6000 Family Software Configuration Guide—Releases 6. With MAC address reduction enabled. if another bridge in the same spanning-tree domain does not run the MAC address reduction feature. 32768. Figure 8-9 Bridge Identifier with MAC Address Reduction Enabled Bridge ID Priority Bridge Priority 4 bits System ID Ext. 16384.Chapter 8 Bridge Identifiers Configuring Spanning Tree Figure 8 shows the bridge identifier when you do not enable MAC address reduction. 49152. 20480. you should also enable MAC address reduction on all other Layer-2 connected switches to avoid undesirable root election and spanning tree topology issues. Bridge ID MAC ADDR 00-d0-00-4c-18-00 Bridge ID Priority 32769 (bridge priority: 32768. 53248. CISCO7603. This example shows the bridge ID priority for VLAN 1 when you enable MAC address reduction in PVST+ mode. The bridge ID priority is the unique identifier for the VLAN or the MISTP instance.4 8-14 43842 43841 Bridge Priority 2 bytes MAC Address 6 bytes 78-13315-02 . 28672. 57344. The bridge priority and the system ID extension combined are known as the bridge ID priority. sys ID ext: 1) Bridge Max Age 20 sec Hello Time 2 sec Forward Delay 15 sec If you have a Catalyst switch in your network with MAC address reduction enabled. the lowest being preferred) can only be specified as a multiple of 4096. 36864. 12288. The bridge identifier consists of the bridge priority. you can see the bridge ID priority for a VLAN in PVST+ or for an MISTP instance in MISTP or MISTP-PVST+ mode. 4096. .

page 8-xvi Configuring the PVST+ Port Cost. page 8-xvii Configuring the PVST+ Port Priority.Chapter 8 Configuring Spanning Tree Using PVST+ Using PVST+ PVST+ is the default spanning tree mode for Catalyst 6000 family switches. the port cost is 19. Table 8-3 PVST+ Default Configuration Feature VLAN 1 Enable state MAC address reduction Bridge priority Bridge ID priority Port priority Port cost Default Value All ports assigned to VLAN 1 PVST+ enabled for all VLANs Disabled 32768 32769 (bridge priority plus system ID extension of VLAN 1) 32 • • • • Gigabit Ethernet: 4 Fast Ethernet: 191 FDDI/CDDI: 10 Ethernet: 1002 Default spantree port cost mode Port VLAN priority Port VLAN cost Maximum aging time Hello time Forward delay time Short (802.4 78-13315-02 8-15 . page 8-xv Setting the PVST+ Bridge ID Priority. the port cost is 100. 2. These sections describe how to configure PVST+ on Ethernet VLANs: • • • • • • • • Default PVST+ Configuration. If 10/100 Mbps ports autonegotiate or are hard set to 100 Mbps.1D) Same as port priority but configurable on a per-VLAN basis in PVST+ Same as port cost but configurable on a per-VLAN basis in PVST+ 20 seconds 2 seconds 15 seconds 1.3 and 6. page 8-xx Disabling the PVST+ Mode on a VLAN. page 8-xviii Configuring the PVST+ Port Cost for a VLAN. page 8-xviii Configuring the PVST+ Default Port Cost Mode. page 8-xix Configuring the PVST+ Port Priority for a VLAN. If 10/100 Mbps ports autonegotiate or are hard set to 10 Mbps. page 8-xx Default PVST+ Configuration Table 3 shows the default PVST+ configuration. Catalyst 6000 Family Software Configuration Guide—Releases 6.

49152. When the switch is in PVST+ mode with MAC address reduction enabled.--------. set spantree priority bridge_ID_priority [vlan] Verify the bridge ID priority. you can enter a bridge priority value between 0–65535. 8192. 4096. 28672. 20480. 32768. you can enter one of 16 bridge priority values: 0. When the switch is in PVST+ mode without MAC address reduction enabled. 36864. The bridge priority is combined with the system ID extension (that is. or 61440.4 8-16 78-13315-02 .-------. This example shows how to set the PVST+ bridge ID priority when MAC address reduction is not enabled (default): Console> Spantree Console> VLAN 1 Spanning Spanning Spanning (enable) set spantree priority 30000 1 1 bridge priority set to 30000.---------not-connected 4 32 disabled 0 not-connected 4 32 disabled 0 not-connected 100 32 disabled 0 not-connected 100 32 disabled 0 This example shows how to set the PVST+ bridge ID priority when MAC reduction is enabled: Console> (enable) set spantree priority 32768 1 Spantree 1 bridge ID priority set to 32769 (bridge priority: 32768 + sys ID extension: 1) Console> (enable) show spantree 1/1 1 VLAN 1 Spanning tree mode PVST+ Spanning tree type ieee Spanning tree enabled Catalyst 6000 Family Software Configuration Guide—Releases 6. To set the spanning tree bridge priority for a VLAN. 53248. The bridge priority value you enter also becomes the VLAN bridge ID priority for that VLAN. perform this task in privileged mode: Task Step 1 Step 2 Command show spantree [vlan] [active] Set the PVST+ bridge ID priority for a VLAN. 40960.Chapter 8 Using PVST+ Configuring Spanning Tree Setting the PVST+ Bridge ID Priority The bridge ID priority is the priority of a VLAN when the switch is in PVST+ mode. 57344.---. the ID of the VLAN) to create the bridge ID priority for the VLAN. 45056. (enable) show spantree 1 tree mode tree type tree enabled PVST+ ieee Designated Root 00-60-70-4c-70-00 Designated Root Priority 16384 Designated Root Cost 19 Designated Root Port 2/3 Root Max Age 14 sec Hello Time 2 sec Forward Delay 10 sec Bridge ID MAC ADDR Bridge ID Priority Bridge Max Age 20 sec Port -----------------------1/1 1/2 2/1 2/2 00-d0-00-4c-18-00 30000 Hello Time 2 sec Forward Delay 15 sec Vlan ---1 1 1 1 Port-State Cost Prio Portfast Channel_id ------------. 24576. 16384.3 and 6. 12288.

To configure the PVST+ port cost for a port. sys ID ext: 1) Hello Time 2 sec Forward Delay 15 sec Vlan ---1 1 1 1 Port-State Cost Prio Portfast Channel_id ------------. Console> (enable) show spantree 2/3 VLAN 1 .---.---------1/1 1 not-connected 4 32 disabled 0 1/2 1 not-connected 4 32 disabled 0 2/1 1 not-connected 100 32 disabled 0 2/2 1 not-connected 100 32 disabled 0 2/3 1 forwarding 12 32 disabled 0 Catalyst 6000 Family Software Configuration Guide—Releases 6.---. The ports with lower port costs are more likely to be chosen to forward frames.--------. This example shows how to configure the PVST+ port cost on a port and verify the configuration: Console> (enable) set spantree portcost 2/3 12 Spantree port 2/3 path cost set to 12.” for information on using the set channel cost command. see the “Calculating and Assigning Port Costs” section on page 8-4.-------. Assign lower numbers to ports that are attached to faster media (such as full duplex) and higher numbers to ports that are attached to slower media. .------------. it does not appear in the configuration file. Verify the port cost setting. “Configuring EtherChannel.---.4 78-13315-02 8-17 .--------. perform this task in privileged mode: Task Step 1 Step 2 Command set spantree portcost {mod/port} cost show spantree mod/port Configure the PVST+ port cost for a switch port.Chapter 8 Configuring Spanning Tree Using PVST+ Designated Root 00-60-70-4c-70-00 Designated Root Priority 16384 Designated Root Cost 19 Designated Root Port 2/3 Root Max Age 14 sec Hello Time 2 sec Forward Delay 10 sec Bridge ID MAC ADDR Bridge ID Priority Bridge Max Age 20 sec Port -----------------------1/1 1/2 2/1 2/2 00-d0-00-4c-18-00 32769 (bridge priority: 32768. For information about calculating port cost. See the “Setting the EtherChannel Port Path Cost” section in Chapter 6. The command causes a “set spantree portcost” entry to be created for each port in the channel.---------not-connected 4 32 disabled 0 not-connected 4 32 disabled 0 not-connected 100 32 disabled 0 not-connected 100 32 disabled 0 Configuring the PVST+ Port Cost You can configure the port cost of switch ports.-------. Port Vlan Port-State Cost Prio Portfast Channel_id -----------------------. . The default cost differs for different media. Note When you enter the set channel cost command.3 and 6. The possible cost is from 1 to 65535 when using the short method for calculating port cost and from 1 to 200000000 when using the long method.

perform this task in privileged mode: Task Step 1 Step 2 Command set spantree portpri mod/port priority show spantree mod/port Configure the PVST+ port priority for a switch port. the port with the lowest port number forwards frames. Port Vlan Port-State Cost Prio Portfast Channel_id -----------------------. If all ports have the same priority value. The default is 32. . Verify the port priority setting. • The short mode has these parameters: – Portcost – Portvlancost (trunk ports only) – When uplinkfast is enabled.Chapter 8 Using PVST+ Configuring Spanning Tree 2/4 1 not-connected 100 32 disabled Configuring the PVST+ Port Priority You can configure the port priority of switch ports in PVST+ mode.-------.4 8-18 78-13315-02 .3 and 6.---. the actual cost is incremented by 3000 • The long mode has these parameters: – Portcost – Portvlancost (trunk ports only) – When uplinkfast is enabled. You can enter the set spantree defaultcostmode command to force all VLANs associated with all the ports to have the same port cost default set. The port with the lowest priority value forwards frames for all VLANs.000.--------. all switches in the network must have the same path cost defaults.---------1/1 1 not-connected 4 32 disabled 0 1/2 1 not-connected 4 32 disabled 0 2/1 1 not-connected 100 32 disabled 0 2/2 1 not-connected 100 32 disabled 0 2/3 1 forwarding 19 16 disabled 0 2/4 1 not-connected 100 32 disabled 0 Configuring the PVST+ Default Port Cost Mode If any switch in your network is using a port speed of 10 Gb or over and the network is using PVST+ spanning tree mode.---.------------. the actual cost is incremented by 10. Two default port cost modes are available—short and long. Console> (enable) show spantree 2/3 VLAN 1 . To configure the PVST+ port priority for a port. .000 Catalyst 6000 Family Software Configuration Guide—Releases 6. This example shows how to configure the PVST+ port priority for a port: Console> (enable) set spantree portpri 2/3 16 Bridge port 2/3 port priority set to 16. The possible port priority value is 0–63.

The possible cost is from 1 to 65535 when using the short method for calculating port cost and from 1 to 200000000 when using the long method. This example shows how to configure the PVST+ port VLAN cost on port 2/3 for VLANs 1 through 5: Console> (enable) set spantree portvlancost 2/3 cost 20000 1-5 Port 2/3 VLANs 6-11. For information about calculating port cost.” for information on using the set channel cost command. perform this task in privileged mode: Task Configure the PVST+ default port cost mode. See the “Setting the EtherChannel Port Path Cost” section in Chapter 6. AVERAGE_COST/NUM_PORT The default port cost mode is set to short in PVST+ mode.13-1005.1025-4094 have path cost 12. The default cost differs for different media. it does not appear in the configuration file.3 and 6.Chapter 8 Configuring Spanning Tree Using PVST+ – EtherChannel computes the cost of a bundle using the formula. To configure the PVST+ port VLAN cost for a port. perform this task in privileged mode: Task Configure the PVST+ port cost for a VLAN on a port. see the “Calculating and Assigning Port Costs” section on page 8-4. Port 2/3 VLANs 1-5. Console> (enable) Configuring the PVST+ Port Cost for a VLAN You can configure the port cost of switch ports. To configure the PVST+ default port cost mode.12 have path cost 20000.4 78-13315-02 8-19 . Console> (enable Catalyst 6000 Family Software Configuration Guide—Releases 6. Command set spantree defaultcostmode {short | long} This example shows how to configure the PVST+ default port cost mode: Console> (enable) set spantree defaultcostmode long Portcost and portvlancost set to use long format default values. “Configuring EtherChannel. The ports with lower port costs are more likely to be chosen to forward frames. Assign lower numbers to ports that are attached to faster media (such as full duplex) and higher numbers to ports that are attached to slower media. This parameter applies to trunking ports only. the default port cost mode must be set to long. For port speeds of 10 Gb and greater. The command causes a “set spantree portcost” entry to be created for each port in the channel. Command set spantree portvlancost {mod/port} [cost cost] [vlan_list] Note When you use the set channel cost command.

show config all This example shows how to configure the port priority for VLAN 6 on port 2/3: Console> (enable) set spantree portvlanpri 2/3 16 6 Port 2/3 vlans 6 using portpri 16. The default is 32. perform this task in privileged mode: Task Step 1 Step 2 Command Configure the PVST+ port priority for a VLAN on set spantree portvlanpri mod/port priority a port.802-1004. the port with the lowest port number forwards frames for that VLAN. If all ports have the same priority value for a particular VLAN. . This parameter applies to trunking ports only. [vlans] Verify the port VLAN priority. When you disable spanning tree on a VLAN.2/13-14. Caution We do not recommend disabling spanning tree. the switch does not participate in spanning-tree and any BPDUs received in that VLAN are flooded on all ports.3 and 6. To configure the port VLAN priority for a port. Port 2/3 vlans 1-5. Console> (enable) show config all .1006-4094 using portpri 32. . set spantree portvlanpri 2/48 0 set spantree portvlancost 2/1 cost 99 set spantree portvlancost 2/2 cost 99 set spantree portvlancost 2/3 cost 20000 1-5. The port VLAN priority value must be lower than the port priority value.2/4-11. Spanning tree serves as a safeguard against misconfigurations and cabling errors. you can set the port priority for a trunking port in a VLAN. set spantree portcost 2/12.12 Disabling the PVST+ Mode on a VLAN When the switch is in PVST+ mode.2/15 19 set spantree portcost 2/1-2. Catalyst 6000 Family Software Configuration Guide—Releases 6. Port 2/3 vlans 801.Chapter 8 Using PVST+ Configuring Spanning Tree Configuring the PVST+ Port Priority for a VLAN When the switch is in PVST+ mode. The port with the lowest priority value for a specific VLAN forwards frames for that VLAN. .2/16-48 100 set spantree portcost 2/3 12 set spantree portpri 2/1-48 32 set spantree portvlanpri 2/1 0 set spantree portvlanpri 2/2 0 . .1005 using portpri 4. Do not disable spanning tree in a VLAN without ensuring that there are no physical loops present in the VLAN. The possible port priority range is 0–63. you can disable spanning-tree on individual VLANs or all VLANs. even in a topology that is free of physical loops.4 8-20 78-13315-02 .7-800.

You cannot disable spanning tree on some switches or routers in a VLAN and leave spanning tree enabled on other switches or routers in the VLAN. they will have incomplete information about the physical topology of the network which may cause unexpected results.Chapter 8 Configuring Spanning Tree Using PVST+ Caution Do not disable spanning tree on a VLAN unless all switches or routers in the VLAN have spanning tree disabled. Catalyst 6000 Family Software Configuration Guide—Releases 6.4 78-13315-02 8-21 .3 and 6. If spanning tree remains enabled on the switches and routers.

Note We recommend that if you use MISTP mode.4 8-22 78-13315-02 . page 8-xxv Mapping VLANs to an MISTP Instance. When all switches in the network are configured in MISTP-PVST+. perform this task in privileged mode: Task Disable PVST+ mode on a VLAN. the information collected at runtime is used to build the port database for the new mode. If you return to the previous mode. you should configure all of your Catalyst 6000 family switches to run MISTP. the configuration is still there. page 8-xxiii Configuring an MISTP Instance. You must have at least one forwarding port in the VLAN in order for the MISTP instance to be active. Note Map VLANs to MISTP instances on Catalyst 6000 family switches that are either in VTP server mode or transparent mode only. If you want to use MISTP mode in your network. page 8-xxxi Catalyst 6000 Family Software Configuration Guide—Releases 6. however. all of the configuration parameters are preserved for the previous mode. you can then enable MISTP on all of the switches.Chapter 8 Using MISTP-PVST+ or MISTP Configuring Spanning Tree To disable PVST+.3 and 6. These sections describe how to use MISTP-PVST+ or MISTP: • • • • • Default MISTP and MISTP-PVST+ Configuration. You cannot map VLANs to MISTP instances on switches that are in VTP client mode. Console> (enable) Command set spantree disable vlans [all] Using MISTP-PVST+ or MISTP The default spanning tree mode on the Catalyst 6000 family switches is PVST+. page 8-xxix Disabling MISTP-PVST+ or MISTP. and the new spanning tree mode restarts the computation of the active topology. the current mode stops. you must first enable MISTP-PVST+ mode on each switch on which you intend to use MISTP so that PVST+ BPDUs can flow through the switches while you configure them. Information about the port states is lost. then map at least one VLAN to the instance. page 8-xxiii Setting MISTP-PVST+ Mode or MISTP Mode. If you are changing a switch from PVST+ mode to MISTP mode and you have other switches in the network that are using PVST+. you first enable an MISTP instance. When you change the spanning tree mode. This example shows how to disable PVST+ on a VLAN: Console> (enable) set spantree disable 4 Spantree 4 disabled. To use MISTP mode. we recommend you carefully follow the procedures described in the following sections in order to avoid losing connectivity in your network.

Reduce the number of configured VLAN ports on your switch to no more than 6000 to avoid losing connectivity. Setting MISTP-PVST+ Mode or MISTP Mode If you enable MISTP in a PVST+ network. you must be careful to avoid bringing down the network.Chapter 8 Configuring Spanning Tree Using MISTP-PVST+ or MISTP Default MISTP and MISTP-PVST+ Configuration Table 4 shows the default MISTP and MISTP-PVST+ configuration. you can Telnet to the switch. the port cost is 100. This section explains how to enable MISTP or MISTP-PVST+ on your network.4 78-13315-02 8-23 . changing from MISTP to either PVST+ or MISTP-PVST+ mode could bring down your network. do not use a Telnet connection through the data port or you will lose your connection to the switch. Caution If you have more than 6000 VLAN ports configured on your switch. the port cost is 19.1D) Same as port priority but configurable on a per-VLAN basis in PVST+ Same as port cost but configurable on a per-VLAN basis in PVST+ 20 seconds 2 seconds 15 seconds 1. Caution If you are working from a Telnet connection to your switch. you must do so from the switch console. Catalyst 6000 Family Software Configuration Guide—Releases 6. If 10/100 Mbps ports autonegotiate or are hard set to 10 Mbps. 2. Table 8-4 MISTP and MISTP-PVST+ Default Configuration Feature Enable state MAC address reduction Bridge priority Bridge ID priority Port priority Port cost Default Value Disabled until a VLAN is mapped to an MISTP instance Disabled 32768 32769 (bridge priority plus the system ID extension of MISTP instance 1) 32 (global) • • • • Gigabit Ethernet: 4 Fast Ethernet: 191 FDDI/CDDI: 10 Ethernet: 1002 Default port cost mode Port VLAN priority Port VLAN cost Maximum aging time Hello time Forward delay time Short (802. the first time you enable MISTP-PVST+ or MISTP mode.3 and 6. After you map a VLAN to an MISTP instance. If 10/100 Mbps ports autonegotiate or are hard set to 100 Mbps.

Note MAC addresses are not displayed when you specify the keyword config. To display spanning tree mapping. Show the spanning tree mapping. perform this task in privileged mode: Task Set a spanning tree mode. Command set spantree mode {mistp | pvst+ | mistp-pvst+} This example shows how to set a switch to MISTP-PVST+ mode: Console> (enable) set spantree mode mistp-pvst+ PVST+ database cleaned up.----------------. When in the PVST+ mode. This display is available only in the MISTP or MISTP-PVST+ mode.3 and 6.4 8-24 78-13315-02 . This example shows how to display the spanning tree VLAN instance mapping in MISTP mode: MISTP/MISTP-PVST+ Console> (enable) set spantree mode mistp PVST+ database cleaned up.-------------------------1 00-50-3e-78-70-00 1 2 00-50-3e-78-70-00 3 00-50-3e-78-70-00 4 00-50-3e-78-70-00 5 00-50-3e-78-70-00 6 00-50-3e-78-70-00 7 00-50-3e-78-70-00 8 00-50-3e-78-70-00 9 00-50-3e-78-70-00 10 00-50-3e-78-70-00 11 00-50-3e-78-70-00 12 00-50-3e-78-70-00 13 00-50-3e-78-70-00 14 00-50-3e-78-70-00 15 00-50-3e-78-70-00 16 00-50-3e-78-70-00 - Catalyst 6000 Family Software Configuration Guide—Releases 6.Chapter 8 Using MISTP-PVST+ or MISTP Configuring Spanning Tree To change from PVST+ to MISTP-PVST+ or MISTP. Console> (enable) show spantree mapping Inst Root Mac Vlans ---. Console> (enable) You can display VLAN-to-MISTP instance mapping information propagated from the root switch at runtime. perform this task in privileged mode: Task Command set spantree mode mistp show spantree mapping [config] Step 1 Step 2 Set the spanning tree mode to MISTP. use the optional keyword config to display the list of mappings configured on the local switch. Spantree mode set to MISTP-PVST+. Warning!! There are no VLANs mapped to any MISTP instance. Spantree mode set to MISTP.

sys ID ext: 1) Hello Time 2 sec Forward Delay 15 sec Vlan ---1 1 1 1 1 Port-State Cost Prio Portfast Channel_id ------------. 16384. page 8-xxvii Configuring the MISTP Port Instance Priority. To configure the bridge ID priority for an MISTP instance.-------. 45056. 24576. page 8-xxvii Configuring the MISTP Bridge ID Priority You can set the bridge ID priority for an MISTP instance when the switch is in MISTP or MISTP-PVST+ mode. Verify the bridge ID priority.---.Chapter 8 Configuring Spanning Tree Using MISTP-PVST+ or MISTP Configuring an MISTP Instance These sections describe how to configure MISTP instances: • • • • • Configuring the MISTP Bridge ID Priority. 53248. 32768. page 8-xxvi Configuring the MISTP Port Instance Cost. 8192. 12288. 49152.--------. The bridge priority value is combined with the system ID extension (the ID of the MISTP instance) to create the bridge ID priority. 20480. perform this task in privileged mode: Task Step 1 Step 2 Command set spantree priority bridge_ID_priority [mistp-instance instance] show spantree mistp-instance instance [mod/port] active Configure the bridge ID priority for an MISTP instance. 57344. and 61440. The example shows how to configure the bridge ID priority for an MISTP instance: Console> (enable) set spantree priority 8192 mistpinstance 1 Spantree 1 bridge ID priority set to 8193 (bridge priority: 8192 + sys ID extension: 1) Console> (enable) show spantree mistp-instance 1 VLAN 1 Spanning tree mode MISTP Spanning tree type ieee Spanning tree enabled VLAN mapped to MISTP Instance: 1 Bridge ID MAC ADDR Bridge ID Priority Bridge Max Age 20 sec Port -----------------------1/1 1/2 2/1 2/2 2/3 00-d0-00-4c-18-00 8193 (bridge priority: 8192. 4096.---------not-connected 20000 32 disabled 0 not-connected 20000 32 disabled 0 not-connected 2000000 32 disabled 0 not-connected 2000000 32 disabled 0 forwarding 200000 32 disabled 0 Catalyst 6000 Family Software Configuration Guide—Releases 6.4 78-13315-02 8-25 . page 8-xxv Configuring the MISTP Port Cost. You can set 16 possible bridge priority values: 0. 28672.3 and 6. 36864. 40960. page 8-xxvi Configuring the MISTP Port Priority.

4 8-26 78-13315-02 . If all ports have the same priority value. The ports with lower port costs are more likely to be chosen to forward frames.--------. (enable) show spantree mistp-instance active 1 tree mode MISTP-PVST+ tree type ieee tree instance enabled Designated Root 00-d0-00-4c-18-00 Designated Root Priority 32769 (root priority: 32768. The default cost differs for different media. This example shows how to configure the port cost on a MISTP instance and verify the configuration: Console> Spantree Console> Instance Spanning Spanning Spanning (enable) set spantree portcost 2/12 22222222 port 2/12 path cost set to 22222222.---. For information about calculating port cost. To configure the port cost for a port. set spantree portcost mod/port cost Verify the port cost setting. sys ID ext: 1) Designated Root Cost 0 Designated Root Port none VLANs mapped: 6 Root Max Age 20 sec Hello Time 2 sec Forward Delay 15 sec Bridge ID MAC ADDR Bridge ID Priority VLANs mapped: Bridge Max Age 20 sec 00-d0-00-4c-18-00 32769 (bridge priority: 32768.------------. perform this task in privileged mode: Task Step 1 Step 2 Command show spantree mistp-instance instance [mod/port] active Configure the MISTP port cost for a switch port. Catalyst 6000 Family Software Configuration Guide—Releases 6. the port with the lowest port number forwards frames. set spantree portpri mod/port priority [instance] Verify the port priority setting. The port with the lowest priority value forwards frames for all VLANs. see the “Calculating and Assigning Port Costs” section on page 8-4.---.---------2/12 1 forwarding 22222222 40 disabled 0 Console> (enable) Configuring the MISTP Port Priority You can configure the port priority of ports.3 and 6. the default is 32.-------.Chapter 8 Using MISTP-PVST+ or MISTP Configuring Spanning Tree Configuring the MISTP Port Cost You can configure the port cost of switch ports. perform this task in privileged mode: Task Step 1 Step 2 Command show spantree mistp-instance instance [mod/port] active Configure the MISTP port priority for a port. sys ID ext: 1) 6 Hello Time 2 sec Forward Delay 15 sec Port Inst Port-State Cost Prio Portfast Channel_id -----------------------. Assign lower numbers to ports that are attached to faster media (such as full duplex) and higher numbers to ports that are attached to slower media. The possible port priority value is 0–63. The possible cost is from 1 to 65535 when using the short method for calculating port cost and from 1 to 200000000 when using the long method. To configure the port priority for a port.

Console> (enable) Configuring the MISTP Port Instance Priority You can set the port priority for an instance of MISTP.3 and 6. The port with the lowest priority value for a specific MISTP instance forwards frames for that instance. sys ID ext: 1) Designated Root Cost 0 Designated Root Port none VLANs mapped: 6 Root Max Age 20 sec Hello Time 2 sec Forward Delay 15 sec Bridge ID MAC ADDR Bridge ID Priority VLANs mapped: Bridge Max Age 20 sec 00-d0-00-4c-18-00 32769 (bridge priority: 32768. If all ports have the same priority value for an MISTP instance. [instances] This example shows how to configure the MISTP port instance cost on a port: Console> (enable) set spantree portinstancecost 2/12 cost 110110 2 Port 2/12 instances 1.---.4 78-13315-02 8-27 . You should assign lower numbers to ports attached to faster media (such as full duplex) and higher numbers to ports attached to slower media.---.------------.-------. sys ID ext: 1) 6 Hello Time 2 sec Forward Delay 15 sec Port Inst Port-State Cost Prio Portfast Channel_id -----------------------. To configure the port instance cost for a port. Console> (enable) show spantree mistp-instance 1 Instance 1 Spanning tree mode MISTP-PVST+ Spanning tree type ieee Spanning tree instance enabled Designated Root 00-d0-00-4c-18-00 Designated Root Priority 32769 (root priority: 32768. The possible port instance range is 0–63. Catalyst 6000 Family Software Configuration Guide—Releases 6. The possible value for port instance cost is 1–268435456. the port with the lowest port number forwards frames for that instance.3-16 have path cost 22222222. The default cost differs for different media. Ports with a lower instance cost are more likely to be chosen to forward frames.---------2/12 1 forwarding 22222222 40 disabled 0 Console> (enable) Configuring the MISTP Port Instance Cost You can configure the port instance cost for an instance of MISTP or MISTP-PVST+. Port 2/12 instances 2 have path cost 110110. perform this task in privileged mode: Task Command Configure the MISTP port instance cost on set spantree portinstancecost {mod/port} [cost cost] a port.--------.Chapter 8 Configuring Spanning Tree Using MISTP-PVST+ or MISTP This example shows how to configure the port priority and verify the configuration: Console> (enable) set spantree portpri 2/12 40 Bridge port 2/12 port priority set to 40.

however.3 and 6. Task Command set spantree enable mistp-instance instance [all] show spantree mistp-instance [instance] [active] mod/port Step 1 Step 2 Enable an MISTP instance. Console> (enable) Enabling an MISTP Instance You can enable up to 16 MISTP instances. the default instance. This example shows how to enable an MISTP instance: Console> (enable) set spantree enable mistp-instance 2 Spantree 2 enabled. perform this task in privileged mode. is enabled by default. a range of instances. perform this task in privileged mode: Task Configure the port instance priority on an MISTP instance. You can enable a single MISTP instance. Command set spantree portinstancepri {mod/port} priority [instances] This example shows how to configure the port instance priority on an MISTP instance and verify the configuration: Console> (enable) set spantree portinstancepri 2/12 10 2 Port 2/12 instances 2 using portpri 10. Note The software does not display the status of an MISTP instance until it has a VLAN with an active port mapped to it.3-16 using portpri 40. . (enable) show spantree mistp-instance 2 2 tree mode MISTP tree type ieee tree instance enabled Catalyst 6000 Family Software Configuration Guide—Releases 6. Console> Instance Spanning Spanning Spanning .4 8-28 78-13315-02 . you must map a VLAN to it in order for it to be active. MISTP instance 1. To enable an MISTP instance. Each MISTP instance defines a unique spanning tree topology.Chapter 8 Using MISTP-PVST+ or MISTP Configuring Spanning Tree To configure the port instance priority on an MISTP instance. Port 2/12 mistp-instance 1. or all instances at once using the all keyword. Verify the instance is enabled. . Note Enter the active keyword to display active ports only.

These sections describe how to configure MISTP instances: • • Determining MISTP Instances—VLAN Mapping Conflicts. page 8-xxx Note See Chapter 11. You can map as many Ethernet VLANs as you wish to an MISTP instance.-------. You cannot map a VLAN to more than one MISTP instance.---. See the “Creating Extended-Range VLANs” section on page 11-7 in Chapter 11. Verify the VLAN is mapped.---------- Catalyst 6000 Family Software Configuration Guide—Releases 6. To map a VLAN to an MISTP instance. sys ID ext: 1) 6 Hello Time 2 sec Forward Delay 15 sec Port Inst Port-State Cost Prio Portfast Channel_id -----------------------.3 and 6. perform this task in privileged mode: Task Command set vlan vlan mistp-instance instance show spantree mistp-instance [instance] [active] mod/port Step 1 Step 2 Map a VLAN to an MISTP instance. you must map at least one VLAN to an MISTP instance in order for MISTP-PVST+ or MISTP to be active. Note To use VLANs 1025–4094. sys ID ext: 1) Designated Root Cost 0 Designated Root Port none VLANs mapped: 6 Root Max Age 20 sec Hello Time 2 sec Forward Delay 15 sec Bridge ID MAC ADDR Bridge ID Priority VLANs mapped: Bridge Max Age 20 sec 00-d0-00-4c-18-00 49153 (bridge priority: 49152. This example shows how to map a VLAN to MISTP instance 1 and verify the mapping: Console> (enable) set vlan 6 mistp-instance 1 Vlan 6 configuration successful Console> (enable) show spantree mist-instance 1 Instance 1 Spanning tree mode MISTP-PVST+ Spanning tree type ieee Spanning tree instance enabled Designated Root 00-d0-00-4c-18-00 Designated Root Priority 49153 (root priority: 49152. “Configuring VLANs” for details on using extended-range VLANs. • • • • You can only map Ethernet VLANs to MISTP instances. At least one VLAN in the instance must have an active port in order for MISTP-PVST+ or MISTP to be active. page 8-xxx Unmapping VLANs from an MISTP Instance. “Configuring VLANs” for details on using and configuring VLANs.Chapter 8 Configuring Spanning Tree Using MISTP-PVST+ or MISTP Mapping VLANs to an MISTP Instance When you are using MISTP-PVST+ or MISTP on a switch.4 78-13315-02 8-29 .------------.--------. you must enable MAC address reduction.---.

You can use the show spantree conflicts command to determine to which MISTP instances you have attempted to map the VLAN.4 8-30 78-13315-02 .3 and 6. the VLAN is mapped to that instance. Unmapping VLANs from an MISTP Instance The keyword none is used to unmap the specified VLANs from the MISTP instances to which they are currently mapped. the MAC addresses of the root switches that are sending the BPDUs containing the VLAN mapping information. Entries pertaining to the root switch show inactive on the root switch itself.--------1 00-30-a3-4a-0c-00 inactive 20 3 00-30-f1-e5-00-01 inactive 10 The Delay timer shows the time in seconds remaining before the VLAN joins the instance. The Time Left timer shows the time in seconds left before the entry expires and is removed from the table. The timer is restarted every time an incoming BPDU confirms the mapping. you must manually remove the incorrect mapping(s) from the root switch. When only one entry is printed or when all the entries are associated to the same instance.----------------. perform this task in privileged mode: Task Unmap a VLAN from an MISTP instance. all of its ports are set to blocking mode. and the timers associated with the mapping of a VLAN to an MISTP instance. the resulting state of all the ports of the VLAN (if the VLAN exists) is blocking. To determine VLAN mapping conflicts. If you attempt to map a VLAN to more than one instance.--------. The remaining entry on the list becomes the official mapping.Chapter 8 Using MISTP-PVST+ or MISTP Configuring Spanning Tree 2/12 1 forwarding 22222222 40 disabled 0 Determining MISTP Instances—VLAN Mapping Conflicts A VLAN can only be mapped to one MISTP instance. perform this task in privileged mode: Task Determine VLAN mapping conflicts. This command prints a list of the MISTP instances associated with the VLAN. When you unmap a VLAN from an MISTP instance. or if the VLAN is in conflict between instances. the VLAN is in conflict. Command show spantree conflicts vlan This example shows there is an attempt to map VLAN 2 to MISTP instance 1 and to MISTP instance 3 on two different switches as seen from a third switch in the topology: Console> (enable) show spantree conflicts 2 Inst MAC Delay Time left ---. The field displays inactive if the VLAN is already mapped to an instance (the timer has expired). Command set vlan vlan mistp-instance none This example shows how to unmap a VLAN from an MISTP instance: Console> (enable) set vlan 6 mistp-instance none Vlan 6 configuration successful Catalyst 6000 Family Software Configuration Guide—Releases 6. If two or more entries in the list are associated with different MISTP instances. To unmap a VLAN or all VLANs from an MISTP instance. To clear up the conflict.

page 8-xxxi Configuring a Secondary Root Switch. perform this task in privileged mode: Task Disable an MISTP instance. page 8-xxxiii Using Root Guard—Preventing Switches from Becoming Root. You enter the set spantree root command to reduce the bridge priority (the value associated with the switch) from the default (32768) to a lower value. Because different VLANs could potentially have different root switches. page 8-xxxii Configuring a Root Switch to Improve Convergence. modify the bridge priority to be 1 less or the same as the bridge priority of the current root switch. the instance still exists on the switch.Chapter 8 Configuring Spanning Tree Configuring a Root Switch Disabling MISTP-PVST+ or MISTP When the switch is in MISTP mode. When you specify a switch as the primary root. page 8-xxxiv Configuring a Primary Root Switch You can set a root switch on a VLAN when the switch is in PVST+ mode or on an MISTP instance when the switch is in MISTP mode. the default bridge priority is modified so that it becomes the root for the specified VLANs. the bridge VLAN-priority chosen makes this switch the root for all the VLANs specified. To disable an MISTP instance. If this setting does not result in the switch becoming a root. Set the bridge priority to 8192. When you disable spanning tree on an MISTP instance. If reducing the bridge priority as low as 1 still does not make the switch the root switch. perform this task in privileged mode: Task Configure a switch as the primary root switch. Caution Enter the set spantree root command on backbone switches or distribution switches only. not on access switches. you disable spanning tree on an instance. and the instance BPDUs are flooded. To configure a switch as the primary root switch.4 78-13315-02 8-31 . which allows the switch to become the root switch. all of the VLANs mapped to it have all of their ports forwarding.3 and 6. the system displays a message. Command set spantree root [vlans] [dia network_diameter] [hello hello_time] Catalyst 6000 Family Software Configuration Guide—Releases 6. Configuring a Root Switch These sections explain how to configure a root switch: • • • • Configuring a Primary Root Switch. Command set spantree disable mistp-instance instance [all] This example shows how to disable an MISTP instance: Console> (enable) set spantree disable mistp-instance 2 MI-STP instance 2 disabled. not for the whole switch.

hello time set to 2 seconds. network_diameter] [hello hello_time] This example shows how to configure the primary root switch for an instance: Console> (enable) set spantree root mistp-instance 2-4 dia 4 Instances 2-4 bridge priority set to 8192 VLInstances 2-4 bridge max aging time set to 14 seconds.24 bridge hello time set to 1 second. Command set spantree root [secondary] vlans [dia network_diameter] [hello hello_time] This example shows how to configure the secondary root switch for VLANs 22 and 24: Console> (enable) set spantree root secondary 22. Switch is now the root switch for active Instances 1-6. making it the probable candidate to become the root switch if the primary root switch fails. Instances 2-4 bridge hello time set to 2 seconds. Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. perform this task in privileged mode: Task Configure a switch as the secondary root switch. To configure a switch as the primary root switch for an instance.24 dia 5 hello 1 VLANs 22. VLANs 22.384.3 and 6. The set spantree root secondary command reduces the bridge priority to 16. Instances 2-4 bridge forward delay set to 9 seconds. root switch for active VLANs 1-6. You can run this command on more than one switch to create multiple backup switches in case the primary root switch fails. forward delay set to 9 seconds. VLANs 22.Chapter 8 Configuring a Root Switch Configuring Spanning Tree This example shows how to configure the primary root switch for VLANs 1–10: Console> (enable) VLANs 1-10 bridge VLANs 1-10 bridge VLANs 1-10 bridge VLANs 1-10 bridge Switch is now the Console> (enable) set spantree root 1-10 dia 4 priority set to 8192 max aging time set to 14 seconds. Console> (enable) Configuring a Secondary Root Switch You can set a secondary root switch on a VLAN when the switch is in PVST+ mode or on an MISTP instance when the switch is in MISTP mode.4 8-32 78-13315-02 . VLANs 22. To configure a switch as the secondary root switch.24 bridge max aging time set to 10 seconds. perform this task in privileged mode: Task Command Configure a switch as the primary root switch for set spantree root mistp-instance instance [dia an instance.24 bridge priority set to 16384.24 bridge forward delay set to 7 seconds.

For information on configuring these timers. In a network with links of 10 Mbps or faster. Instances 2-4 bridge hello time set to 2 seconds. it then goes through listening and learning before reaching the forwarding state. PortFast mode affects only the transition from disable (link down) to enable (link up) by moving the port immediately to the forwarding state. With WAN connections. This reconfiguration time depends on the network diameter. If a port in the PortFast mode begins blocking. you cannot reduce the parameters. Reconfiguring the default parameters (specified by IEEE 802. When a link failure occurs in a bridged network. the network reconfiguration is not immediate. you can reduce the convergence time. Forward Delay Timer. For information about PortFast. and Maximum Age Timer parameters on the root switch. See Table 5 for the nondefault parameters for a reconvergence of 14 seconds.Chapter 8 Configuring Spanning Tree Configuring a Root Switch To configure a switch as the secondary root switch for an instance.3 and 6.1D standard. see the Catalyst 6000 Family Software Configuration Guide—Releases 6.1D) for the Hello Time. Instances 2-4 bridge forward delay set to 9 seconds. perform this task in privileged mode: Task Configure a switch as the secondary root switch for an instance. the network diameter can reach the maximum value of 7. use nondefault parameter values permitted by the 802. which is the maximum number of bridges between any two end stations. see the “Configuring Spanning Tree Timers” section on page 8-xxxv. Console> (enable) Configuring a Root Switch to Improve Convergence By lowering the values for the Hello Time. Forward Delay Timer. Table 8-5 Nondefault Parameters Parameter Network Diameter (dia) Hello Time Forward Delay Timer Maximum Age Timer Time 2 2 seconds 4 seconds 6 seconds Note You can set switch ports in PortFast mode for improved convergence. Note Reducing the timer parameters values is possible only if your network has LAN links of 10 Mbps or faster. Command set spantree root [secondary] mistp-instance instance [dia network_diameter] [hello hello_time] This example shows how to configure the secondary root for an instance: Console> (enable) set spantree root secondary mistp-instance 2-4 dia 4 Instances 2-4 bridge priority set to 8192 VLInstances 2-4 bridge max aging time set to 14 seconds.4 78-13315-02 8-33 . To speed up convergence. and Maximum Age Timer requires a 50-second delay. Switch is now the root switch for active Instances 1-6.

Verify the configuration. Configure the maximum aging time for a VLAN or an MISTP instance. it is disabled for the specified port(s).” To configure the spanning tree parameters to improve convergence.4 8-34 78-13315-02 . Verify the configuration. Console> (enable) Using Root Guard—Preventing Switches from Becoming Root You may want to prevent switches from becoming the root switch. Console> (enable) Console> (enable) set spantree root 1-10 dia 4 VLANs 1-10 bridge priority set to 8192 VLANs 1-10 bridge max aging time set to 14 seconds. and 4 seconds respectively: Console> (enable) set spantree hello 2 100 Spantree 100 hello time set to 7 seconds. VLANs 1-10 bridge hello time set to 2 seconds. When you enable root guard on a per-port basis. When you disable root guard. it automatically goes into the listening state. Forward Delay Timer. Catalyst 6000 Family Software Configuration Guide—Releases 6. VLANs 1-10 bridge forward delay set to 9 seconds. BackboneFast. 4. The root guard feature forces a port to become a designated port so that no switch on the other end of the link can become a root switch. If a port goes into the root-inconsistent state. and Loop Guard. UplinkFast. Console> (enable) Console> (enable) set spantree maxage 6 100 Spantree 100 max aging time set to 36 seconds. [instances] Verify the configuration. show spantree [vlan | mistp-instance instances] set spantree fwddelay delay [vlan] mistp-instance [instances] show spantree [mod/port] mistp-instance [instances] [active] set spantree maxage agingtime [vlans] mistp-instance instances show spantree [mod/port] mistp-instance [instances] [active] This example shows how to configure the spanning tree Hello Time. perform this task in privileged mode: Task Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Command Configure the hello time for a VLAN or an set spantree hello interval [vlan] mistp-instance MISTP instance. Configure the forward delay time for a VLAN or an MISTP instance. it is automatically applied to all of the active VLANs to which that port belongs. Switch is now the root switch for active VLANs 1-6. “Configuring Spanning Tree PortFast. and Maximum Age Timer to 2.Chapter 8 Configuring a Root Switch Configuring Spanning Tree “Understanding How PortFast Works” section on page 9-2 in Chapter 9. Console> (enable) Console> (enable) set spantree fwddelay 4 100 Spantree 100 forward delay set to 21 seconds.3 and 6.

or if you do not specify an MISTP instance when the switch is in MISTP mode. For most situations. MISTP instance 1 is assumed. Catalyst 6000 Family Software Configuration Guide—Releases 6. The possible range of interval is 1 to 10 seconds. we recommend that you use the set spantree root and set spantree root secondary commands to modify the spanning tree performance parameters. You can configure the spanning tree timers for a VLAN in PVST+ or an MISTP instance in MISTP mode. These sections describe how to configure spanning tree timers: • • • Configuring the Hello Time.3 and 6. If you do not specify a VLAN when the switch is in PVST+ mode. VLAN 1 is assumed. The timeout value is the forward delay parameter of the switches. The timeout value is the maximum age parameter of the switches.4 78-13315-02 8-35 . Configuring Spanning Tree Timers Spanning tree timers affect the spanning tree performance. Table 8-6 Spanning Tree Timers Variable Hello Time Maximum Age Timer Description Determines how often the switch broadcasts its hello message to other switches. Verify that root guard is enabled.Chapter 8 Configuring Spanning Tree Configuring Spanning Tree Timers To prevent switches from becoming root. page 8-xxxvi Configuring the Maximum Aging Time. page 8-xxxv Configuring the Forward Delay Time. Monitors the time spent by a port in the learning and listening states. perform this task in privileged mode: Task Step 1 Step 2 Command set spantree guard {root | none} mod/port show spantree guard {mod/port | vlan} {mistp-instance instance | mod/port} Enable root guard on a port. Table 6 describes the switch variables that affect spanning tree performance. page 8-xxxvi Caution Exercise care using these commands. Default 2 seconds Measures the age of the received protocol information recorded for 20 seconds a port and ensures that this information is discarded when its age limit exceeds the value of the maximum age parameter recorded by the switch. 15 seconds Forward Delay Timer Configuring the Hello Time Enter the set spantree hello command to change the hello time for a VLAN or for an MISTP instance.

3 and 6. mistp-instance [instances] Verify the configuration. Console> (enable) Configuring the Forward Delay Time Enter the set spantree fwddelay command to configure the spanning tree forward delay time for a VLAN. [instances] Verify the configuration. The possible range of delay is 4 to 30 seconds. Catalyst 6000 Family Software Configuration Guide—Releases 6. perform this task in privileged mode: Task Step 1 Step 2 Command Configure the hello time for a VLAN or an set spantree hello interval [vlan] mistp-instance MISTP instance. perform this task in privileged mode: Task Step 1 Step 2 Command Configure the forward delay time for a VLAN or set spantree fwddelay delay [vlan] an MISTP instance. Console> (enable) Configuring the Maximum Aging Time Enter the set spantree maxage command to change the spanning tree maximum aging time for a VLAN or an instance. The possible range of agingtime is 6 to 40 seconds. Console> (enable) This example shows how to set the bridge forward delay for an instance to 16 seconds: Console> (enable) set spantree fwddelay 16 mistp-instance 1 Instance 1 forward delay set to 16 seconds.4 8-36 78-13315-02 . Console> (enable) This example shows how to configure the spanning tree hello time for an instance to 3 seconds: Console> (enable) set spantree hello 3 mistp-instance 1 Spantree 1 hello time set to 3 seconds. show spantree [mod/port] mistp-instance [instances] [active] This example shows how to configure the spanning tree forward delay time for VLAN 100 to 21 seconds: Console> (enable) set spantree fwddelay 21 100 Spantree 100 forward delay set to 21 seconds. show spantree [vlan | mistp-instance instances] This example shows how to configure the spanning tree hello time for VLAN 100 to 7 seconds: Console> (enable) set spantree hello 7 100 Spantree 100 hello time set to 7 seconds.Chapter 8 Configuring Spanning Tree Timers Configuring Spanning Tree To configure the spanning tree bridge hello time for a VLAN or an MISTP instance. To configure the spanning tree forward delay time for a VLAN.

The number of syslog messages that are generated may impact the convergence of the network and the CPU utilization of the switch. If the BPDU is not received on a VLAN at the configured time interval. In MISTP. The nonroot switches receive and process one BPDU during each configured time period. a syslog message is displayed. If BPDU skewing occurs. the syslog messages are as follows: • • Generated 50 percent of the maximum age time (see the “Configuring the Maximum Aging Time” section on page 8-xxxvi) Rate limited at one for every 60 seconds Catalyst 6000 Family Software Configuration Guide—Releases 6. To reduce the impact on the switch. Expected BPDUs are not received. Spanning tree detects topology changes. BPDU skewing detects BPDUs that are not processed in a regular time frame on the nonroot switches in the network. The root switch advertises its presence by sending out BPDUs for the configured Hello time interval.3 and 6. The syslog applies to both PVST+ and MISTP. the skew detection is on a per-instance basis. A VLAN may not receive the BPDU as scheduled. Spanning tree uses the Hello Time (see the “Configuring the Hello Time” section on page 8-xxxv) to detect when a connection to the root switch exists through a port and when that connection is lost. Console> (enable) Understanding How BPDU Skewing Works BPDU skewing is the difference between when the BPDUs are expected to be received and the time BPDUs are actually received.4 78-13315-02 8-37 . The skew causes BPDUs to reflood the network to keep the spanning tree topology database current. Console> (enable) This example shows how to set the maximum aging time for an instance to 25 seconds: Console> (enable) set spantree maxage 25 mistp-instance 1 Instance 1 max aging time set to 25 seconds. New syslog messages are not generated as individual messages for every VLAN because the higher the number of syslog messages that are reported. This feature applies to both PVST+ and MISTP. the BPDU is skewed. the slower the switching process will be.Chapter 8 Configuring Spanning Tree Understanding How BPDU Skewing Works To configure the spanning tree maximum aging time for a VLAN or an instance. perform this task in privileged mode: Task Step 1 Step 2 Command set spantree maxage agingtime [vlans] mistp-instance instances show spantree [mod/port] mistp-instance [instances] [active] Configure the maximum aging time for a VLAN or an MISTP instance. Skewing occurs when the following occurs: • • • Spanning tree timers lapse. This example shows how to configure the spanning tree maximum aging time for VLAN 100 to 36 seconds: Console> (enable) set spantree maxage 36 100 Spantree 100 max aging time set to 36 seconds. Verify the configuration.

enter the set spantree bpdu-skewing command. Console> (enable) Console> (enable) show spantree bpdu-skewing 1 Bpdu skewing statistics for vlan 1 Port Last Skew ms Worst Skew ms Worst Skew Time -----. Provide a display of the VLAN or PVST+ or MISTP instance and the port affected by the skew including this information: – The last skew duration (in absolute time) – The worst skew duration (in absolute time) – The date and time of the worst duration To change how spanning tree performs BPDU skewing statistics gathering. 06:26:05 8/10 113522 113522 Tue Nov 21 2000. The bpdu-skewing command is disabled by default. 06:26:05 8/14 113678 113678 Tue Nov 21 2000.4 8-38 78-13315-02 .------------. 06:26:05 8/12 4111 113600 Tue Nov 21 2000. 06:25:59 8/4 4050 113198 Tue Nov 21 2000. 06:26:05 Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. Verify the configuration. 06:26:05 8/28 4111 113931 Tue Nov 21 2000.Chapter 8 Configuring BPDU Skewing Configuring Spanning Tree Configuring BPDU Skewing Commands that support the spanning tree BPDU skewing feature perform these functions: • • • Allow you to enable or disable BPDU skewing. perform this task in privileged mode: Task Step 1 Step 2 Command set spantree bpdu-skewing [enable | disable] show spantree bpdu-skewing vlan [mod/port] show spantree bpdu-skewing mistp-instance [instance] [mod/port] Configure BPDU skewing.------------------------8/2 5869 108370 Tue Nov 21 2000. 06:26:05 8/18 113833 113833 Tue Nov 21 2000. This example shows how to configure BPDU skewing and view the skewing statistics: Console> (enable) set spantree bpdu-skewing Usage:set spantree bpdu-skewing <enable|disable> Console> (enable) set spantree bpdu-skewing enable Spantree bpdu-skewing enabled on this switch.------------. 06:26:05 8/8 4111 113441 Tue Nov 21 2000. 06:26:04 8/6 113363 113363 Tue Nov 21 2000. Modify the show spantree summary output to show if the skew detection is enabled and for which VLANs or PVST+ or MISTP instances the skew was detected. 06:26:05 8/16 4111 113755 Tue Nov 21 2000. 06:26:05 8/26 113926 113926 Tue Nov 21 2000. The default is disabled. 06:26:05 8/22 113917 113917 Tue Nov 21 2000. To configure the BPDU skewing statistics gathering for a VLAN. 06:26:05 8/24 4110 113922 Tue Nov 21 2000. 06:26:05 8/20 4111 113913 Tue Nov 21 2000.3 and 6.

Chapter 8 Configuring Spanning Tree Configuring BPDU Skewing This example shows how to configure BPDU skewing for VLAN 1 on module 8.--------. port 2 and view the skewing statistics: Console> (enable) show spantree bpdu-skewing 1 8/4 Bpdu skewing statistics for vlan 1 Port Last Skew ms Worst Skew ms Worst Skew Time -----. Summary of connected spanning tree ports by vlan VLAN Blocking Listening Learning Forwarding STP Active ----.---------1 6 4 2 0 12 Blocking Listening Learning Forwarding STP Active ----. The show spantree summary command displays if BPDU skew detection is enabled and also lists the VLANs or instances affected in the skew.------------.--------.---------.-------. 06:25:59 You will receive a similar output when MISTP is running.3 and 6.-------.---------. Portfast bpdu-filter disabled for bridge.---------Total 6 4 2 0 12 Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.------------.------------------------8/4 5869 108370 Tue Nov 21 2000. This example shows the output when using the show spantree summary command: Console> (enable) show spantree summary Root switch for vlans: 1 BPDU skewing detection enabled for the bridge BPDU skewed for vlans: 1 Portfast bpdu-guard disabled for bridge. Backbonefast disabled for bridge.4 78-13315-02 8-39 . Uplinkfast disabled for bridge.-------.-------.

4 8-40 78-13315-02 .3 and 6.Chapter 8 Configuring BPDU Skewing Configuring Spanning Tree Catalyst 6000 Family Software Configuration Guide—Releases 6.

page 9-xv Configuring Loop Guard. Note For information on configuring the Spanning Tree Protocol (STP). page 9-xvii Catalyst 6000 Family Software Configuration Guide—Releases 6. page 9-xi Configuring UplinkFast. page 9-iv Understanding How Loop Guard Works. see Chapter 8. UplinkFast. page 9-xiii Configuring BackboneFast.” Note For complete syntax and usage information for the commands used in this chapter.4 78-13315-02 9-1 . and Loop Guard This chapter describes how to configure the spanning tree PortFast. page 9-ii Understanding How BackboneFast Works. page 9-ii Understanding How PortFast BPDU Guard Works. This chapter consists of these sections: • • • • • • • • • • • • Understanding How PortFast Works. refer to the Catalyst 6000 Family Command Reference publication. and loop guard features on the Catalyst 6000 family switches. BackboneFast. page 9-ii Understanding How PortFast BPDU Filter Works. page 9-vii Configuring PortFast BPDU Guard. page 9-v Configuring PortFast. page 9-ix Configuring PortFast BPDU Filter. “Configuring Spanning Tree.3 and 6.C H A P T E R 9 Configuring Spanning Tree PortFast. BackboneFast. UplinkFast. page 9-ii Understanding How UplinkFast Works.

3 and 6. spanning tree loops can occur if BPDUs are being transmitted and received on those ports. The blocked ports do not include self-looping ports. and Loop Guard Understanding How PortFast Works PortFast causes a spanning tree port to immediately enter the forwarding state. UplinkFast. PortFast BPDU filtering is enabled globally but applies to PortFast-enabled ports only. rather than waiting for spanning tree to converge. The most secure implementation of PortFast occurs when you enable it on ports that connect end stations to switches. Spanning tree sends BPDUs from all ports regardless of whether PortFast is enabled or not. PortFast-configured interfaces do not receive BPDUs. Catalyst 6000 Family Software Configuration Guide—Releases 6. In a valid configuration. The PortFast BPDU filter allows access ports to move directly to the forwarding state as soon as end hosts are connected. You can use PortFast on switch ports connected to a single workstation or server to allow those devices to connect to the network immediately. an uplink group consists of the root port (which is forwarding) and a set of blocked ports. such as a connection of an unauthorized device. because you must manually put the interface back in service. spanning tree shuts down PortFast-configured interfaces that receive BPDUs.4 9-2 78-13315-02 .Chapter 9 Understanding How PortFast Works Configuring Spanning Tree PortFast. a BPDU is received by a PortFast-configured interface. In an invalid configuration. rather than putting them into the spanning tree blocking state. BackboneFast. Note When enabled on the switch. bypassing the listening and learning states. When you enable BPDU guard on the switch. An uplink group is a set of ports (per VLAN). To prevent loops in a network. Caution Use PortFast only when connecting a single end station to a switch port. The uplink group provides an alternate path in case the currently forwarding link fails. This feature is on a per-switch basis. Understanding How PortFast BPDU Filter Works BPDU filtering provides a method for you to avoid transmitting BPDUs on a PortFast-enabled port. Specifically. Otherwise. spanning tree applies the PortFast BPDU guard feature to all PortFast-configured interfaces. Understanding How PortFast BPDU Guard Works PortFast BPDU guard prevents spanning tree loops by moving a nontrunking port into the errdisable state when a BPDU is received on that port. connected to an end system which helps save CPU time. If you enable PortFast on nontrunking ports that connect two switches. you might create a network loop. BPDU guard can prevent invalid configurations. only one of which is forwarding at any given time. Understanding How UplinkFast Works UplinkFast provides fast convergence after a spanning tree topology change and achieves load balancing between redundant links using uplink groups. you can enable PortFast on nontrunking access ports only because these ports typically do not transmit or receive bridge protocol data units (BPDUs). after BPDU filtering is enabled it applies to all PortFast-enabled ports.

4 78-13315-02 9-3 . Figure 1 shows an example topology with no link failures. Figure 9-2 UplinkFast Example After Direct Link Failure Switch A (Root) L1 Switch B L2 Link failure L3 UplinkFast transitions port directly to forwarding state Switch C 11242 Catalyst 6000 Family Software Configuration Guide—Releases 6. as shown in Figure 2. This feature may not be useful for other types of applications. UplinkFast. Switch A. The port on Switch C that is connected directly to Switch B is in blocking state.3 and 6. is connected directly to Switch B over link L1 and to Switch C over link L2. This switchover takes approximately 1 to 5 seconds. UplinkFast unblocks the blocked port on Switch C and transitions it to the forwarding state without going through the listening and learning states.Chapter 9 Configuring Spanning Tree PortFast. BackboneFast. the root switch. Figure 9-1 UplinkFast Example Before Direct Link Failure Switch A (Root) L1 Switch B L2 L3 Blocked port Switch C 11241 If Switch C detects a link failure on the currently active link L2 (a direct link failure). and Loop Guard Understanding How UplinkFast Works Note UplinkFast is most useful in wiring-closet switches.

it causes the maximum aging time on the ports on which it received the inferior BPDU to expire. This switchover takes approximately 30 seconds. If all the alternate paths to the root bridge indicate that the switch has lost connectivity to the root bridge. (Self-looped ports are not considered alternate paths to the root bridge. the root switch. Figure 3 shows an example topology with no link failures. as specified by the agingtime variable of the set spantree maxage command. it uses these alternate paths to transmit a new kind of PDU called the Root Link Query PDU out all alternate paths to the root bridge. the switch ignores inferior BPDUs for the configured maximum aging time.4 9-4 78-13315-02 . all blocked ports become alternate paths to the root bridge. If the inferior BPDU arrives on a blocked port. BackboneFast then transitions the port on Switch C to the forwarding state. the switch assumes that it has lost connectivity to the root bridge. providing a path from Switch B to Switch A. UplinkFast.) If the inferior BPDU arrives on the root port. Under normal spanning tree rules. If the switch determines that it still has an alternate path to the root. If the inferior BPDU arrives on the root port and there are no blocked ports. If one or more alternate paths can still connect to the root bridge. An inferior BPDU identifies one switch as both the root bridge and the designated bridge. Switch A. the designated bridge has lost its connection to the root bridge). the switch makes all ports on which it received an inferior BPDU its designated ports and moves them out of the blocking state (if they were in the blocking state). connects directly to Switch B over link L1 and to Switch C over link L2.3 and 6. Figure 9-3 BackboneFast Example Before Indirect Link Failure Switch A (Root) L1 Switch B L2 L3 Blocked port Switch C 11241 If link L1 fails. and becomes the root switch according to normal spanning tree rules. and Loop Guard Understanding How BackboneFast Works BackboneFast is initiated when a root port or blocked port on a switch receives inferior BPDUs from its designated bridge. BackboneFast allows the blocked port on Switch C to move immediately to the listening state without waiting for the maximum aging time for the port to expire. through the listening and learning states. When a switch receives an inferior BPDU. The switch tries to determine if it has an alternate path to the root bridge. The port on Switch C that connects directly to Switch B is in the blocking state. the root port and other blocked ports on the switch become alternate paths to the root bridge. the switch causes the maximum aging times on the ports on which it received an inferior BPDU to expire. If the switch has alternate paths to the root bridge. it indicates that a link to which the switch is not directly connected (an indirect link) has failed (that is. Switch B no longer has a path to the root switch.Chapter 9 Understanding How BackboneFast Works Configuring Spanning Tree PortFast. Switch C detects this failure as an indirect failure. BackboneFast. and into the forwarding state. causes the maximum aging time on the root to expire. Figure 4 shows how BackboneFast reconfigures the topology to account for the failure of link L1. since it is not connected directly to link L1. Catalyst 6000 Family Software Configuration Guide—Releases 6.

BackboneFast is not activated.4 78-13315-02 11244 BackboneFast transitions port through listening and learning states to forwarding state 9-5 . The loop guard feature checks if a root port or an alternate root port receives BPDUs. Figure 5 shows a shared-medium topology in which a new switch is added. However. Figure 9-5 Adding a Switch in a Shared-Medium Topology Switch A (Root) Switch C Blocked port Switch B (Designated Bridge) Added switch 11245 Understanding How Loop Guard Works Unidirectional link failures may cause a root port or alternate port to become designated as root if BPDUs are absent. Some software failures may introduce temporary loops in the network. If the port is not receiving BPDUs.3 and 6. UplinkFast. The new switch begins sending inferior BPDUs that say it is the root switch. Loop guard isolates the failure and lets spanning tree converge to a stable topology without the failed link or bridge. Catalyst 6000 Family Software Configuration Guide—Releases 6. and Loop Guard Understanding How Loop Guard Works Figure 9-4 BackboneFast Example After Indirect Link Failure Switch A (Root) L1 Link failure L2 L3 Switch B Switch C If a new switch is introduced into a shared-medium topology. the other switches ignore these inferior BPDUs and the new switch learns that Switch B is the designated bridge to Switch A. the root switch. the loop guard feature puts the port into an inconsistent state until it starts receiving BPDUs again. BackboneFast.Chapter 9 Configuring Spanning Tree PortFast.

Loop guard interacts with other features as follows: • • Loop guard does not affect the functionality of UplinkFast or BackboneFast.3 and 6. Disabling loop guard moves all loop-inconsistent ports to the listening state. Enabling loop guard on a root switch has no effect but provides protection when a root switch becomes a nonroot switch. Follow these guidelines when using loop guard: • • • You cannot enable loop guard on PortFast-enabled or dynamic VLAN ports. Use loop guard only in topologies where there are blocked ports.4 9-6 78-13315-02 . it is automatically applied to all of the active instances or VLANs to which that port belongs. If you enable loop guard on a channel and the first link becomes unidirectional. loop guard blocks the entire channel until the affected port is removed from the channel. When you disable loop guard. When you enable loop guard. BackboneFast. Catalyst 6000 Family Software Configuration Guide—Releases 6. Topologies that have no blocked ports. Do not enable loop guard on ports that are connected to a shared link. do not need to enable this feature. and Loop Guard You can enable loop guard on a per-port basis.Chapter 9 Understanding How Loop Guard Works Configuring Spanning Tree PortFast. B. You cannot enable PortFast on loop guard-enabled ports. Figure 9-6 Triangle Switch Configuration with Loop Guard A 3/1 3/2 3/1 B 3/2 3/1 3/2 C Designated port 55772 Root port Alternate port Figure 6 illustrates the following configuration: • • • Switches A and B are distribution switches. Figure 6 shows loop guard in a triangle switch configuration. You cannot enable loop guard if root guard is enabled. and C. Loop guard is enabled on ports 3/1 and 3/2 on Switches A. UplinkFast. it is disabled for the specified ports. Switch C is an access switch. which are loop free. Note We recommend that you enable loop guard on root ports and alternate root ports on access switches.

loop guard blocks the channel. but loop guard will not be able to detect it. You cannot configure a loop guard-enabled port with dynamic VLAN membership. UplinkFast. to form a channel. Loop guard ignores the message age expiration on type-inconsistent ports and PVID-inconsistent ports. Note You can enable UniDirectional Link Detection (UDLD) to help isolate the link failure. even if one or more of the links that formed the channel are unidirectional. However. A loop may occur until UDLD detects the failure. even if other links in the channel are functioning properly. spanning tree loses all the state information for those ports and the new channel port may obtain the forwarding state with a designated role. if a port is put into the blocked state by loop guard. If your network has a type-inconsistent port or a PVID-inconsistent port. In high-availability switch configurations.Chapter 9 Configuring Spanning Tree PortFast. all the physical ports grouped in the channel must have compatible configurations. BackboneFast. The port transitions out of the inconsistent state after the message age expires. it remains blocked even after switchover to the redundant supervisor engine. If that • • • • link becomes unidirectional. page 9-viii Catalyst 6000 Family Software Configuration Guide—Releases 6. but the port is moved into the type-inconsistent state or PVID-inconsistent state. – If a channel is blocked by loop guard and the channel breaks. Loop guard is effective only if the port is a root port or an alternate port. The newly activated supervisor engine recovers the port only after receiving a BPDU on that port. Because a PortFast-enabled port will not be a root port or alternate port. PAgP enforces uniform configurations of root guard or loop guard on all the physical ports to form a channel. page 9-viii Disabling PortFast.4 78-13315-02 9-7 . These caveats apply to loop guard: – Spanning tree always chooses the first operational port in the channel to send the BPDUs. If the port is already blocked by loop guard. Loop guard can take advantage of logical ports provided by the Port Aggregation Protocol (PAgP). misconfigured BPDUs received on the port make loop guard recover. • Loop guard has no effect on a disabled spanning tree instance or a VLAN. – If a set of ports that are already blocked by loop guard are grouped together to form a channel. Loop guard uses the ports known to spanning tree. loop guard and PortFast cannot be configured on the same port. spanning tree loses all the state information. PortFast transitions a port into a forwarding state immediately when a link is established. and Loop Guard Configuring PortFast • Root guard forces a port to be always designated as the root port. Assigning dynamic VLAN membership for the port requires that the port is PortFast enabled. The individual physical ports may obtain the forwarding state with the designated role. You cannot enable loop guard and root guard on a port at the same time. all BPDUs are dropped until the misconfiguration is corrected.3 and 6. Configuring PortFast These sections describe how to configure PortFast on the switch: • • Enabling PortFast.

Use with caution. a fast start port Spantree port 4/1 set spantree portfast 4/1 enable port fast start should only be enabled on ports connected Connecting hubs. to can cause temporary spanning tree loops. Verify the PortFast setting. This example shows how to enable PortFast on a port and verify the configuration (the PortFast status is shown in the “Fast-Start” column): Console> (enable) Warning: Spantree to a single host. Console> (enable) show spantree 4/1 Port Vlan Port-State Cost --------. and Loop Guard Enabling PortFast Caution Use PortFast only when you connect a single end station to a switch port.Chapter 9 Configuring PortFast Configuring Spanning Tree PortFast. perform this task in privileged mode: Task Step 1 Step 2 Command set spantree portfast mod/port disable show spantree mod/port Disable PortFast on a switch port. BackboneFast. bridges. concentrators. etc. UplinkFast. switches. you might create a network loop.---.3 and 6. To enable PortFast on a switch port. perform this task in privileged mode: Task Command set spantree portfast mod/port enable show spantree mod/port Step 1 Step 2 Enable PortFast on a switch port connected to a single workstation or server.------------. This example shows how to disable PortFast on a port: Console> (enable) set spantree portfast 4/1 disable Spantree port 4/1 fast start disabled. fast start enabled.4 9-8 78-13315-02 . Verify the PortFast setting. Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. otherwise.----4/1 1 blocking 19 4/1 100 forwarding 10 4/1 521 blocking 19 4/1 522 blocking 19 4/1 523 blocking 19 4/1 524 blocking 19 4/1 1003 not-connected 19 4/1 1005 not-connected 19 Console> (enable) Priority -------20 20 20 20 20 20 20 4 Fast-Start ---------enabled enabled enabled enabled enabled enabled enabled enabled Group-method ------------ Disabling PortFast To disable PortFast on a switch port.

This example shows how to enable PortFast BPDU guard on the switch and verify the configuration in the Per VLAN Spanning Tree + (PVST+) mode: Note For additional PVST+ information.-------. see Chapter 8.---------1 0 0 0 4 4 2 0 0 0 4 4 3 0 0 0 4 4 4 0 0 0 4 4 5 0 0 0 4 4 6 0 0 0 4 4 10 0 0 0 4 4 20 0 0 0 4 4 50 0 0 0 4 4 100 0 0 0 4 4 152 0 0 0 4 4 200 0 0 0 5 5 300 0 0 0 4 4 400 0 0 0 4 4 500 0 0 0 4 4 521 0 0 0 4 4 524 0 0 0 4 4 570 0 0 0 4 4 801 0 0 0 0 0 Catalyst 6000 Family Software Configuration Guide—Releases 6. Backbonefast disabled for bridge. BackboneFast. the PortFast BPDU guard option is configured globally.--------.4 78-13315-02 9-9 .---------. “Configuring Spanning Tree. perform this task in privileged mode: Task Command set spantree portfast bpdu-guard enable show spantree summary Step 1 Step 2 Enable PortFast BPDU guard on the switch.-------. Verify the PortFast BPDU guard setting. Portfast bpdu-guard enabled for bridge. page 9-ix Disabling PortFast BPDU Guard.Chapter 9 Configuring Spanning Tree PortFast. PortFast BPDU guard becomes inactive.3 and 6. Console> (enable) show spantree summary Root switch for vlans: none. UplinkFast.” Console> (enable) set spantree portfast bpdu-guard enable Spantree portfast bpdu-guard enabled on this switch. page 9-x Enabling PortFast BPDU Guard Note Although the PortFast feature is configured on an individual port. When you disable PortFast on a port. and Loop Guard Configuring PortFast BPDU Guard Configuring PortFast BPDU Guard These sections describe how to configure PortFast BPDU guard on the switch: • • Enabling PortFast BPDU Guard. Vlan Blocking Listening Learning Forwarding STP Active ----. Uplinkfast disabled for bridge. To enable PortFast BPDU guard on a nontrunking switch port.

3 and 6. Backbonefast disabled for bridge.--------. perform this task in privileged mode: Task Step 1 Step 2 Command set spantree portfast bpdu-guard disable show spantree Disable PortFast BPDU guard on the switch.---------Total 0 0 0 85 85 Console> (enable) Disabling PortFast BPDU Guard To disable PortFast BPDU guard on the switch.---------. BackboneFast. Console> (enable) show spantree summary Summary of connected spanning tree ports by vlan Portfast bpdu-guard disabled for bridge. Vlan Blocking Listening Learning Forwarding STP Active ----.4 9-10 78-13315-02 . and Loop Guard 802 850 917 999 1003 1005 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 4 4 0 0 0 4 4 4 0 0 Blocking Listening Learning Forwarding STP Active ----.-------. This example shows how to disable PortFast BPDU guard on the switch and verify the configuration: Console> (enable) set spantree portfast bpdu-guard disable Spantree portfast bpdu-guard disabled on this switch.--------.Chapter 9 Configuring PortFast BPDU Guard Configuring Spanning Tree PortFast.---------. UplinkFast.---------1 0 0 0 4 4 2 0 0 0 4 4 3 0 0 0 4 4 4 0 0 0 4 4 5 0 0 0 4 4 6 0 0 0 4 4 10 0 0 0 4 4 20 0 0 0 4 4 50 0 0 0 4 4 100 0 0 0 4 4 152 0 0 0 4 4 200 0 0 0 5 5 300 0 0 0 4 4 400 0 0 0 4 4 500 0 0 0 4 4 521 0 0 0 4 4 524 0 0 0 4 4 570 0 0 0 4 4 801 0 0 0 0 0 802 0 0 0 0 0 850 0 0 0 4 4 917 0 0 0 4 4 999 0 0 0 4 4 Catalyst 6000 Family Software Configuration Guide—Releases 6.-------.-------. Uplinkfast disabled for bridge. Verify the PortFast BPDU guard setting.-------.

“Configuring Spanning Tree. Console> (enable) show spantree portfast Portfast BPDU guard is disabled. Verify the PortFast BPDU filter setting.--------.-------. Uplinkfast disabled for bridge. and Loop Guard Configuring PortFast BPDU Filter 1003 1005 0 0 0 0 0 0 0 0 0 0 Blocking Listening Learning Forwarding STP Active ----.3 and 6. UplinkFast. Catalyst 6000 Family Software Configuration Guide—Releases 6.---------Total 0 0 0 85 85 Console> (enable) Configuring PortFast BPDU Filter These sections describe how to configure PortFast BPDU filter on the switch: • • Enabling PortFast BPDU Filter. BackboneFast. perform this task in privileged mode: Task Step 1 Step 2 Command set spantree portfast bpdu-filter enable show spantree summary show spantree portfast Enable PortFast BPDU filtering on the port. page 9-xi Disabling PortFast BPDU Filter. page 9-xii Enabling PortFast BPDU Filter To enable PortFast BPDU filtering on a nontrunking port.---------. Portfast bpdu-filter enabled for bridge.Chapter 9 Configuring Spanning Tree PortFast.-------. Console> (enable) show spantree summary Root switch for vlans: none.” Console> (enable) set spantree portfast bpdu-filter enable Usage: set spantree portfast <mod/port> <enable|disable> set spantree portfast bpdu-guard <enable|disable> set spantree portfast bpdu-filter <enable|disable> Spantree portfast bpdu-filter enabled on this switch. see Chapter 8.4 78-13315-02 9-11 . This example shows how to enable PortFast BPDU filtering on the port and verify the configuration in PVST+ mode: Note For PVST+ information. Backbonefast disabled for bridge. Portfast BPDU filter is disabled.

3 and 6.-------.-------. This example shows how to disable PortFast BPDU filtering on the switch and verify the configuration: Console> (enable) set spantree portfast bpdu-filter disable Spantree portfast bpdu-filter disabled on this switch.Chapter 9 Configuring PortFast BPDU Filter Configuring Spanning Tree PortFast.---------.---------.-------. .---------Total 0 0 0 85 85 Console> (enable) Disabling PortFast BPDU Filter To disable PortFast BPDU filtering on the switch.-------. UplinkFast.-------. . and Loop Guard Vlan Blocking Listening Learning Forwarding STP Active ----. Uplinkfast disabled for bridge. Verify the PortFast BPDU filter setting.4 9-12 78-13315-02 .--------. . 802 0 0 0 0 0 850 0 0 0 4 4 917 0 0 0 4 4 999 0 0 0 4 4 Catalyst 6000 Family Software Configuration Guide—Releases 6.-------. 850 0 0 0 4 4 917 0 0 0 4 4 999 0 0 0 4 4 1003 0 0 0 0 0 1005 0 0 0 0 0 Blocking Listening Learning Forwarding STP Active ----.---------1 0 0 0 4 4 2 0 0 0 4 4 3 0 0 0 4 4 4 0 0 0 4 4 5 0 0 0 4 4 6 0 0 0 4 4 10 0 0 0 4 4 . . Backbonefast disabled for bridge.---------1 0 0 0 4 4 2 0 0 0 4 4 3 0 0 0 4 4 4 0 0 0 4 4 5 0 0 0 4 4 6 0 0 0 4 4 . Vlan Blocking Listening Learning Forwarding STP Active ----. perform this task in privileged mode: Task Step 1 Step 2 Command set spantree portfast bpdu-filter disable show spantree show portfast Disable PortFast BPDU filtering on the switch.--------.---------. Console> (enable) show spantree summary Summary of connected spanning tree ports by vlan Portfast bpdu-filter disabled for bridge. BackboneFast.--------.

“Configuring Spanning Tree. this example shows how to enable UplinkFast with a station-update rate of 40 packets per 100 milliseconds and how to verify that UplinkFast is enabled: Console> (enable) set spantree uplinkfast enable VLANs 1-4094 bridge priority set to 49152. Note When you enable the set spantree uplinkfast command. The station_update_rate value represents the number of multicast packets transmitted per 100 milliseconds (the default is 15 packets per millisecond). making it unlikely that the switch will become the root switch. With PVST+ mode enabled.4 78-13315-02 9-13 . Note For additional MISTP information. see Chapter 8. and Loop Guard Configuring UplinkFast 1003 1005 0 0 0 0 0 0 0 0 0 0 Blocking Listening Learning Forwarding STP Active ----. The port cost and portvlancost of all ports set to above 3000.---------. To enable UplinkFast on the switch.Chapter 9 Configuring Spanning Tree PortFast. BackboneFast.--------. Catalyst 6000 Family Software Configuration Guide—Releases 6. Verify that UplinkFast is enabled.-------. The command is the same but the output may be slightly different.---------Total 0 0 0 85 85 Console> (enable) Configuring UplinkFast You can configure UplinkFast for PVST+ or for Multi-Instance Spanning Tree Protocol (MISTP).-------. uplinkfast enabled for bridge. page 9-xiii Disabling UplinkFast.3 and 6. Station update rate set to 15 packets/100ms. uplinkfast all-protocols field set to off. it affects all VLANs on the switch. page 9-xiv Enabling UplinkFast The set spantree uplinkfast enable command increases the path cost of all ports on the switch. perform this task in privileged mode: Task Command set spantree uplinkfast enable [rate station_update_rate] [all-protocols off | on] show spantree uplinkfast [{mistp-instance [instances]}| vlans] Step 1 Step 2 Enable UplinkFast on the switch.” These sections describe how to configure UplinkFast on the switch: • • Enabling UplinkFast. UplinkFast. You cannot configure UplinkFast on an individual VLAN.

VLAN port list ----------------------------------------------1 1/1(fwd).1/2 100 1/2(fwd) 521 1/1(fwd). uplinkfast all-protocols field set to off.1/2-1/5 21-50 1/9(fwd).1/2 524 1/1(fwd). but the switch priority and port cost values are not reset to the factory defaults. uplinkfast all-protocols field set to off. this example shows the output when you enable UplinkFast: Console> (enable) set spantree uplinkfast enable Instances 1-16 bridge priority set to 49152. it affects all VLANs on the switch.1/2 523 1/1(fwd). 1/6-1/8. 2/12 Console> With MISTP mode enabled. Inst port list -----------------------------------------------1 4/1(fwd) Console> Disabling UplinkFast The set spantree uplinkfast disable command disables UplinkFast on the switch. VLAN port list -----------------------------------------------1-20 1/1(fwd). You cannot disable UplinkFast on an individual VLAN.1/2 Console> (enable) This example shows how to display the UplinkFast feature settings for all VLANs: Console> show spantree uplinkfast Station update rate set to 15 packets/100ms.3 and 6. UplinkFast.4 9-14 78-13315-02 . Note When you enter the set spantree uplinkfast disable command. and Loop Guard Console> (enable) show spantree uplinkfast 1 100 521-524 Station update rate set to 15 packets/100ms. Console> (enable) This example shows how to display the UplinkFast feature settings for a specific instance: Console> show spantree uplinkfast mistp-instance 1 Station update rate set to 15 packets/100ms. The port cost and portinstancecost of all ports set to above 10000000.1/2 522 1/1(fwd). Catalyst 6000 Family Software Configuration Guide—Releases 6. uplinkfast all-protocols field set to off. uplinkfast enabled for bridge.Chapter 9 Configuring UplinkFast Configuring Spanning Tree PortFast. 1/10-1/12 51-100 2/1(fwd). uplinkfast all-protocols field set to off. BackboneFast. Station update rate set to 15 packets/100ms.

To enable BackboneFast on the switch. and Loop Guard Configuring BackboneFast To disable UplinkFast on the switch. Use clear spantree uplinkfast to return stp parameters to default. page 9-xvi Disabling BackboneFast.1/2 524 1/1(fwd). this example shows how to disable UplinkFast on the switch and verify the configuration: Console> (enable) set spantree uplinkfast disable Uplinkfast disabled for switch.4 78-13315-02 9-15 . page 9-xvi Enabling BackboneFast Note For BackboneFast to work. Verify that BackboneFast is enabled. UplinkFast. BackboneFast. page 9-xv Displaying BackboneFast Statistics. BackboneFast is not supported on Token Ring VLANs.3 and 6. Verify that UplinkFast is disabled.1/2 522 1/1(fwd). With PVST+ mode enabled. Catalyst 6000 Family Software Configuration Guide—Releases 6.1/2 100 1/2(fwd) 521 1/1(fwd). perform this task in privileged mode: Task Step 1 Step 2 Command set spantree uplinkfast disable show spantree uplinkfast Disable UplinkFast on the switch.Chapter 9 Configuring Spanning Tree PortFast. This feature is supported for use with third-party switches. uplinkfast all-protocols field set to off. perform this task in privileged mode: Task Command set spantree backbonefast enable show spantree backbonefast Step 1 Step 2 Enable BackboneFast on the switch. you must enable it on all switches in the network.1/2 523 1/1(fwd). Console> (enable) show spantree uplinkfast Station update rate set to 15 packets/100ms.1/2 Console> (enable) Configuring BackboneFast These sections describe how to configure BackboneFast: • • • Enabling BackboneFast. VLAN port list ----------------------------------------------1 1/1(fwd).

UplinkFast. Verify that BackboneFast is disabled.3 and 6. perform this task in privileged mode: Task Step 1 Step 2 Command set spantree backbonefast disable show spantree backbonefast Disable BackboneFast on the switch.--------. This example shows how to disable BackboneFast on the switch and how to verify the configuration: Console> (enable) set spantree backbonefast disable Backbonefast enabled for all VLANs Console> (enable) show spantree backbonefast Backbonefast is disable. Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. Vlan Blocking Listening Learning Forwarding STP Active ----.-------.-------. and Loop Guard This example shows how to enable BackboneFast on the switch and how to verify the configuration: Console> (enable) set spantree backbonefast enable Backbonefast enabled for all VLANs Console> (enable) show spantree backbonefast Backbonefast is enabled.--------.---------.---------Total 0 0 0 1 1 BackboneFast statistics ----------------------Number of inferior BPDUs received (all VLANs) Number of RLQ req PDUs received (all VLANs) Number of RLQ res PDUs received (all VLANs) Number of RLQ req PDUs transmitted (all VLANs) Number of RLQ res PDUs transmitted (all VLANs) Console> (enable) : : : : : 0 0 0 0 0 Disabling BackboneFast To disable BackboneFast on the switch.---------.-------. Backbonefast enabled for bridge. perform this task in privileged mode: Task Display BackboneFast statistics.-------.4 9-16 78-13315-02 .Chapter 9 Configuring BackboneFast Configuring Spanning Tree PortFast. BackboneFast. Console> (enable) Displaying BackboneFast Statistics To display BackboneFast statistics. Command show spantree summary This example shows how to display BackboneFast statistics: Console> (enable) show spantree summary Summary of connected spanning tree ports by vlan Uplinkfast disabled for bridge.---------1 0 0 0 1 1 Blocking Listening Learning Forwarding STP Active ----.

page 9-xvii Disabling Loop Guard.Chapter 9 Configuring Spanning Tree PortFast. Do you want to continue (y/n) [n]? y Loopguard on port 5/1 is enabled. perform this task in privileged mode: Task Step 1 Step 2 Command set spantree guard loop mod/port show spantree guard {mod/port | vlan} mistp-instance instance Enable loop guard on a port. Verify that loop guard is disabled. perform this task in privileged mode: Task Step 1 Step 2 Command set spantree guard none mod/port show spantree guard {mod/port | vlan} mistp-instance instance Disable loop guard on a port. enabling loopguard will disable rootguard on this port. This example shows how to disable loop guard: Console> (enable) set spantree guard none 5/1 Rootguard is disabled on port 5/1. Do you want to continue (y/n) [n]? y Loopguard on port 5/1 is disabled. disabling loopguard will disable rootguard on this port. BackboneFast.4 78-13315-02 9-17 . Console> (enable) Disabling Loop Guard To disable loop guard on the switch. To enable loop guard on the switch.3 and 6. This example shows how to enable loop guard: Console> (enable) set spantree guard loop 5/1 Rootguard is enabled on port 5/1. page 9-xvii Enabling Loop Guard Use the set spantree guard command to enable or disable the spanning tree loop guard feature on a per-port basis. Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. Verify that loop guard is enabled. UplinkFast. and Loop Guard Configuring Loop Guard Configuring Loop Guard These sections describe how to configure BackboneFast: • • Enabling Loop Guard.

Chapter 9 Configuring Loop Guard Configuring Spanning Tree PortFast. UplinkFast.3 and 6. BackboneFast. and Loop Guard Catalyst 6000 Family Software Configuration Guide—Releases 6.4 9-18 78-13315-02 .

page 10-iii Understanding VTP Pruning. see Chapter 11. and security violations.4 78-13315-02 10-1 . Note For complete syntax and usage information for the commands used in this chapter. This chapter consists of these sections: • • • • Understanding How VTP Works. you can make configuration changes centrally on one switch and have those changes automatically communicated to all the other switches in the network. page 10-ii Understanding VTP Advertisements.C H A P T E R 10 Configuring VTP This chapter describes how to configure the VLAN Trunking Protocol (VTP) on the Catalyst 6000 family switches. page 10-v VTP Configuration Guidelines. page 10-iii Catalyst 6000 Family Software Configuration Guide—Releases 6. page 10-v Configuring VTP. You can use VTP to manage VLANs 1 to 1005 in your network. Note For complete information on configuring VLANs. incorrect VLAN-type specifications.) With VTP. page 10-ii Understanding VTP Version 2. (Note that VTP does not support VLANs 1025 to 4094. page 10-ii Understanding VTP Modes. “Configuring VLANs.” These sections describe how VTP works: • • • • • Understanding the VTP Domain. and renaming of VLANs on a network-wide basis. page 10-vi Understanding How VTP Works VTP is a Layer 2 messaging protocol that maintains VLAN configuration consistency by managing the addition. deletion. such as duplicate VLAN names. VTP minimizes misconfigurations and configuration inconsistencies that can result in a number of problems.3 and 6. refer to the Catalyst 6000 Family Command Reference publication. page 10-i Default VTP Configuration.

Mapping eliminates excessive device administration required from network administrators. IEEE 802. VTP servers advertise their VLAN configuration to other switches in the same VTP domain and synchronize their VLAN configuration with other switches based on advertisements received over trunk links. By default. the change is propagated to all switches in the VTP domain. you can create. If the switch receives a VTP advertisement over a trunk link. you can create and modify VLANs but the changes affect only the individual switch. and delete VLANs and specify other configuration parameters (such as VTP version and VTP pruning) for the entire VTP domain.1Q. VTP advertisements are transmitted out all trunk connections. including Inter-Switch Link (ISL). If you configure the switch as VTP transparent.3 and 6. change. VTP advertisements are received by neighboring switches. IEEE 802.Chapter 10 Understanding How VTP Works Configuring VTP Understanding the VTP Domain A VTP domain (also called a VLAN management domain) is made up of one or more interconnected switches that share the same VTP domain name. transparent switches do forward VTP advertisements that they receive out their trunk ports. A VTP transparent switch does not advertise its VLAN configuration and does not synchronize its VLAN configuration based on received advertisements. in VTP version 2. • • Understanding VTP Advertisements Each switch in the VTP domain sends periodic advertisements out each trunk port to a reserved multicast address.1Q) Emulated LAN names (for ATM LANE) 802. Understanding VTP Modes You can configure a switch to operate in any one of these VTP modes: • Server—In VTP server mode. Client—VTP clients behave the same way as VTP servers. You cannot create or modify VLANs on a VTP server until the management domain name is specified or learned. the switch is in VTP server mode and is in the no-management domain state until the switch receives an advertisement for a domain over a trunk link or you configure a management domain. or delete VLANs on a VTP client. However.4 10-2 78-13315-02 .10. You make global VLAN configuration changes for the domain using either the command-line interface (CLI) or Simple Network Management Protocol (SNMP). modify. Transparent—VTP transparent switches do not participate in VTP. but you cannot create. VTP server is the default mode. A switch can be configured to be in one and only one VTP domain. When you make a change to the VLAN configuration on a VTP server. and ATM LAN Emulation (LANE).10 SAID values (FDDI) Catalyst 6000 Family Software Configuration Guide—Releases 6. VTP maps VLANs dynamically across multiple LAN types with unique names and internal index associations. which update their VTP and VLAN configurations as necessary. it inherits the management domain name and the VTP configuration revision number. The switch ignores advertisements with a different management domain name or an earlier configuration revision number. The following global configuration information is distributed in VTP advertisements: • • • VLAN IDs (ISL and 802.

multicast. VTP pruning increases available bandwidth by restricting flooded traffic to those trunk links that the traffic must use to access the appropriate network devices. Version-Dependent Transparent Mode—In VTP version 1. see Chapter 11. you must decide whether to use VTP version 1 or version 2.4 78-13315-02 10-3 . or when information is read from NVRAM. Make sure that all devices in the management domain support VTP pruning before enabling it. VTP pruning is supported in supervisor engine software release 5. By default. VTP pruning is disabled. Another solution is to disable pruning for the LANE VLANs using the clear vtp pruneeligible command on all switches with ATM LANE modules. Note If you are using VTP in a Token Ring environment. If the digest on a received VTP message is correct.” Unrecognized Type-Length-Value (TLV) Support—A VTP server or client propagates configuration changes to its other trunks. you should disable VTP pruning in the VTP management domain that contains the switches with ATM LANE modules installed (VTP pruning messages are sent over the ATM LANE module because it is a trunk). • • • Understanding VTP Pruning VTP pruning enhances network bandwidth use by reducing unnecessary flooded traffic. Consistency Checks—In VTP version 2. For more information about Token Ring VLANs. “Configuring VLANs. without checking the version. Since only one domain is supported in the supervisor engine software. Catalyst 6000 Family Software Configuration Guide—Releases 6. you must use version 2. even for TLVs it is not able to parse.Chapter 10 Configuring VTP Understanding How VTP Works • • • • VTP domain name VTP configuration revision number VLAN configuration. Consistency checks are not performed when new information is obtained from a VTP message.3 and 6. its information is accepted without consistency checks. and flooded unicast packets. VTP version 2 supports the following features not supported in version 1: • Token Ring support—VTP version 2 supports Token Ring LAN switching and VLANs (Token Ring Bridge Relay Function [TrBRF] and Token Ring Concentrator Relay Function [TrCRF]). such as broadcast. including the maximum transmission unit (MTU) size for each VLAN Frame format Understanding VTP Version 2 If you use VTP in your network. The unrecognized TLV is saved in NVRAM. VTP version 2 forwards VTP messages in transparent mode. Note If you are using routers to route between emulated LANS.1(1) and later releases. VLAN consistency checks (such as VLAN names and values) are performed only when you enter new information through the CLI or SNMP. unknown. a VTP transparent switch inspects VTP messages for the domain name and version and forwards a message only if the version and domain name match.

Figure 10-2 Flooding Traffic with VTP Pruning Switch 4 Port 2 Flooded traffic is pruned. 5. The broadcast traffic from Switch 1 is not forwarded to Switches 3. Port 1 on Switch 1 and port 2 on Switch 4 are assigned to the Red VLAN. Port 4 Switch 2 Red VLAN Switch 5 Port 5 Port 1 24511 Switch 6 Switch 3 Switch 1 Enabling VTP pruning on a VTP server enables pruning for the entire management domain. even though Switches 3. traffic from VLAN 1 cannot be pruned. VLAN 1 is always pruning ineligible. and 6 because traffic for the Red VLAN has been pruned on the links indicated (port 5 on Switch 2 and port 4 on Switch 4).Chapter 10 Understanding How VTP Works Configuring VTP Figure 1 shows a switched network without VTP pruning enabled. 5. VTP pruning does not prune traffic from VLANs that are pruning ineligible. Catalyst 6000 Family Software Configuration Guide—Releases 6. Switch 1 floods the broadcast and every switch in the network receives it. A broadcast is sent from the host connected to Switch 1. VTP pruning takes effect several seconds after you enable it. By default. VLANs 2 through 1000 are pruning eligible. and 6 have no ports in the Red VLAN. Figure 10-1 Flooding Traffic without VTP Pruning Switch 4 Port 2 Switch 5 Switch 2 Red VLAN Port 1 S5812 Switch 6 Switch 3 Switch 1 Figure 2 shows the same switched network with VTP pruning enabled.3 and 6.4 10-4 78-13315-02 .

Enabling or disabling VTP pruning on a VTP server enables or disables VTP pruning for the entire management domain. When you enable VTP version 2 on a switch. not for the entire VTP domain. • • • • Catalyst 6000 Family Software Configuration Guide—Releases 6. Making VLANs pruning eligible or pruning ineligible on a switch affects pruning eligibility for those VLANs on that device only (not on all switches in the VTP domain). Table 10-1 VTP Default Configuration Feature VTP domain name VTP mode VTP version 2 enable state VTP password VTP pruning Default Value Null Server Version 2 is disabled None Disabled VTP Configuration Guidelines Follow these guidelines when implementing VTP in your network: • • All switches in a VTP domain must run the same VTP version. In a Token Ring environment. enter the clear vtp pruneeligible command.4 78-13315-02 10-5 . Caution If you configure VTP in secure mode. all of the version 2-capable switches in the domain enable VTP version 2. enter the set vtp pruneeligible command.Chapter 10 Configuring VTP Default VTP Configuration To make a VLAN pruning ineligible. you must enable VTP version 2 for Token Ring VLAN switching to function properly. Default VTP Configuration Table 1 shows the default VTP configuration. Do not enable VTP version 2 on a switch unless all of the switches in the same VTP domain are version 2 capable. Pruning eligibility always applies to the local device only. You must configure a password on each switch in the management domain when in secure mode. To make a VLAN pruning eligible again. the management domain will not function properly if you do not assign a management domain password to each switch in the domain.3 and 6. • A VTP version 2-capable switch can operate in the same VTP domain as a switch running VTP version 1 provided VTP version 2 is disabled on the VTP version 2-capable switch (VTP version 2 is disabled by default). You can set VLAN pruning eligibility regardless of whether VTP pruning is enabled or disabled for the domain.

52. page 10-vi Disabling VTP (VTP Transparent Mode). (Optional) Set a password for the VTP domain. Catalyst 6000 Family Software Configuration Guide—Releases 6. page 10-vi Configuring a VTP Client.-------. page 10-ix Disabling VTP Pruning. perform this task in privileged mode: Task Step 1 Step 2 Step 3 Step 4 Command set vtp domain name set vtp mode server set vtp passwd passwd show vtp domain Define the VTP domain name. you cannot change the VLAN configuration on the switch.---------------.70 disabled disabled 2-1000 Console> (enable) Configuring a VTP Client When a switch is in VTP client mode. you can change the VLAN configuration and have it propagate throughout the network. page 10-vii Enabling VTP Version 2. Verify the VTP configuration.----------.3 and 6.Chapter 10 Configuring VTP Configuring VTP Configuring VTP These sections describe how to configure VTP: • • • • • • • • Configuring a VTP Server. The client switch receives VTP updates from a VTP server in the management domain and modifies its configuration accordingly.--------------. page 10-ix Enabling VTP Pruning.-----------. Place the switch in VTP server mode.-------. This example shows how to configure the switch as a VTP server and verify the configuration: Console> (enable) set vtp domain Lab_Network VTP domain Lab_Network modified Console> (enable) set vtp mode server VTP domain Lab_Network modified Console> (enable) show vtp domain Domain Name Domain Index VTP Version Local Mode Password -------------------------------. page 10-x Configuring a VTP Server When a switch is in VTP server mode. To configure the switch as a VTP server.------------------------172.------------10 1023 40 enabled Last Updater V2 Mode Pruning PruneEligible on Vlans --------------.---------Lab_Network 1 2 server Vlan-count Max-vlan-storage Config Revision Notifications ---------.4 10-6 78-13315-02 . page 10-viii Disabling VTP Version 2.20. page 10-x Displaying VTP.----------.

perform this task in privileged mode: Task Step 1 Step 2 Step 3 Command set vtp domain name set vtp mode client show vtp domain Define the VTP domain name.20. perform this task in privileged mode: Task Command set vtp mode transparent show vtp domain Step 1 Step 2 Disable VTP on the switch by configuring it for VTP transparent mode. A VTP transparent switch does not send VTP updates and does not act on VTP updates received from other switches. Note Network devices in VTP transparent mode do not send VTP Join messages.------------------------172. Verify the VTP configuration. configure the VLANs that are used by the transparent-mode network devices or that need to be carried across trunks as pruning ineligible (use the clear vtp pruneeligible command).Chapter 10 Configuring VTP Configuring VTP To configure the switch as a VTP client.-------. Verify the VTP configuration.4 78-13315-02 10-7 . Place the switch in VTP client mode.------------10 1023 40 enabled Last Updater V2 Mode Pruning PruneEligible on Vlans --------------.70 disabled disabled 2-1000 Console> (enable) Disabling VTP (VTP Transparent Mode) When you configure the switch as VTP transparent.---------------. However.-----------. On Catalyst 6000 family switches with trunk connections to network devices in VTP transparent mode. you disable VTP on the switch. a VTP transparent switch running VTP version 2 does forward received VTP advertisements out all of its trunk links.52.----------.--------------.-------.3 and 6. To disable VTP on the switch. This example shows how to configure the switch as a VTP client and verify the configuration: Console> (enable) set vtp domain Lab_Network VTP domain Lab_Network modified Console> (enable) set vtp mode client VTP domain Lab_Network modified Console> (enable) show vtp domain Domain Name Domain Index VTP Version Local Mode Password -------------------------------.----------. Catalyst 6000 Family Software Configuration Guide—Releases 6.---------Lab_Network 1 2 client Vlan-count Max-vlan-storage Config Revision Notifications ---------.

When you enable VTP version 2 on a switch.20.------------------------172.---------------.-------.----------. every VTP version 2-capable switch in the VTP domain will enable version 2 as well.--------------. Every switch in the VTP domain must use the same VTP version.----------.----------.-------.3 and 6.------------10 1023 1 enabled Last Updater V2 Mode Pruning PruneEligible on Vlans --------------.------------10 1023 0 enabled Last Updater V2 Mode Pruning PruneEligible on Vlans --------------.---------Lab_Net 1 2 Transparent Vlan-count Max-vlan-storage Config Revision Notifications ---------.-----------.20.---------Lab_Net 1 2 server Vlan-count Max-vlan-storage Config Revision Notifications ---------. All devices in the management domain should be version2-capable before enabling. Do you want to continue (y/n) [n]? y VTP domain Lab_Net modified Console> (enable) show vtp domain Domain Name Domain Index VTP Version Local Mode Password -------------------------------. This example shows how to enable VTP version 2 and verify the configuration: Console> (enable) set vtp v2 enable This command will enable the version 2 function in the entire management domain.-------.52. Note In a Token Ring environment.------------------------172.----------.70 disabled disabled 2-1000 Console> (enable) Enabling VTP Version 2 VTP version 2 is disabled by default on VTP version 2-capable switches.---------------. Do not enable VTP version 2 unless every switch in the VTP domain supports version 2.-----------.-------. To enable VTP version 2.Chapter 10 Configuring VTP Configuring VTP This example shows how to configure the switch as VTP transparent and verify the configuration: Console> (enable) set vtp mode transparent VTP domain Lab_Net modified Console> (enable) show vtp domain Domain Name Domain Index VTP Version Local Mode Password -------------------------------. Verify that VTP version 2 is enabled.52.70 enabled disabled 2-1000 Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. Caution VTP version 1 and VTP version 2 are not interoperable on switches in the same VTP domain. perform this task in privileged mode: Task Command set vtp v2 enable show vtp domain Step 1 Step 2 Enable VTP version 2 on the switch.4 10-8 78-13315-02 .--------------. you must enable VTP version 2 for Token Ring VLAN switching to function properly.

VTP domain Lab_Network modified.) Step 3 Step 4 Step 5 (Optional) Make specific VLANs pruning eligible set vtp pruneeligible vlan_range on the device. All devices in the management domain should be pruning-capable before enabling.501-1000 eligible for pruning on this device.1001-1005 will not be pruned on this device. and 501–1000 pruning eligible on the particular device: Console> (enable) set vtp pruning enable This command will enable the pruning function in the entire management domain. perform this task in privileged mode: Task Step 1 Step 2 Command set vtp v2 disable show vtp domain Disable VTP version 2. 250–255. This example shows how to disable VTP version 2: Console> (enable) set vtp v2 disable This command will disable the version 2 function in the entire management domain. set vtp pruning enable (Optional) Make specific VLANs pruning ineligible on the device. (By default. Verify that VTP version 2 is disabled. perform this task in privileged mode: Task Step 1 Step 2 Command clear vtp pruneeligible vlan_range Enable VTP pruning in the management domain. VLANs 2–1000 are pruning eligible.250-255. Do you want to continue (y/n) [n]? y VTP domain Lab_Network modified Console> (enable) clear vtp pruneeligible 100-500 Vlans 1. Warning: trbrf & trcrf vlans will not work properly in this mode. Console> (enable) set vtp pruneeligible 250-255 Vlans 2-99. Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6. show vtp domain show trunk This example shows how to enable VTP pruning in the management domain and how to make VLANs 2–99. Do you want to continue (y/n) [n]? y VTP domain Lab_Net modified Console> (enable) Enabling VTP Pruning To enable VTP pruning. Verify that the appropriate VLANs are being pruned on trunk ports. VTP domain Lab_Network modified. Verify the VTP pruning configuration.100-500.4 78-13315-02 10-9 .Chapter 10 Configuring VTP Configuring VTP Disabling VTP Version 2 To disable VTP version 2.

------------.---------------.--------------------------------------------------------------------1/1 1. perform this task in privileged mode: Task Step 1 Step 2 Command show vtp domain Disable VTP pruning in the management domain.522-524 Port Vlans in spanning tree forwarding state and not pruned -------.-------.----------. including VTP advertisements sent and received and VTP errors.--------------.52.20.250-255.----------. This example shows how to disable VTP pruning in the management domain: Console> (enable) set vtp pruning disable This command will disable the pruning function in the entire management domain.---------Lab_Network 1 2 server Vlan-count Max-vlan-storage Config Revision Notifications ---------.------------8 1023 16 disabled Last Updater V2 Mode Pruning PruneEligible on Vlans --------------.2 disabled enabled 2-99. set vtp pruning disable Verify that VTP pruning is disabled.Chapter 10 Configuring VTP Configuring VTP Console> (enable) show vtp domain Domain Name Domain Index VTP Version Local Mode Password -------------------------------.----------1/1 auto isl trunking 523 Port -------1/1 Port -------1/1 Vlans allowed on trunk --------------------------------------------------------------------1-1005 Vlans allowed and active in management domain --------------------------------------------------------------------1. perform this task: Task Display VTP statistics for the switch.-----------.522-524 Console> (enable) Disabling VTP Pruning To disable VTP pruning.------------------------172.3 and 6.----------.-------.501-1000 Console> (enable) show trunk Port Mode Encapsulation Status Native vlan -------.-----------.4 10-10 78-13315-02 . Command show vtp statistics Catalyst 6000 Family Software Configuration Guide—Releases 6. Do you want to continue (y/n) [n]? y VTP domain Lab_Network modified Console> (enable) Displaying VTP To display VTP activity.

Chapter 10 Configuring VTP Configuring VTP This example shows how to display VTP statistics on the switch: Console> (enable) show vtp statistics VTP statistics: summary advts received 4690 subset advts received 7 request advts received 0 summary advts transmitted 4397 subset advts transmitted 8 request advts transmitted 0 No of config revision errors 0 No of config digest errors 0 VTP pruning statistics: Trunk Join Trasmitted Join Received -------.--------------1/1 0 1/2 0 Console> (enable) ------------0 0 Summary advts received from non-pruning-capable device --------------------------0 0 Catalyst 6000 Family Software Configuration Guide—Releases 6.4 78-13315-02 10-11 .3 and 6.

4 10-12 78-13315-02 .3 and 6.Chapter 10 Configuring VTP Configuring VTP Catalyst 6000 Family Software Configuration Guide—Releases 6.

A VLAN has the same attributes as a physical LAN but allows you to group end stations even if they are not located physically on the same LAN segment. page 11-xxiv Configuring Token Ring VLANs. refer to the Catalyst 6000 Family Command Reference publication.4 78-13315-02 11-1 . and broadcast traffic flooding. page 11-iv Catalyst 6000 Family Software Configuration Guide—Releases 6. page 11-viii Assigning Switch Ports to a VLAN. Note For complete syntax and usage information for the commands used in this chapter. page 11-iii Default VLAN Configuration.3 and 6. These sections describe VLANs: • • • VLAN Ranges. Flooded traffic originating from a particular VLAN is only flooded out ports belonging to that VLAN. page 11-vi Mapping VLANs to VLANs. page 11-i Configuring Normal-Range VLANs. multicast. Figure 1 shows an example of VLANs segmented into logically defined networks. page 11-xxiv Understanding How VLANs Work A VLAN is a group of end stations with a common set of requirements. page 11-ii Configurable VLAN Parameters. This chapter consists of these sections: • • • • • • • • • Understanding How VLANs Work. page 11-xiii Configuring FDDI VLANs. page 11-v Configuring Extended-Range VLANs. independent of their physical location. page 11-xii Deleting a VLAN. page 11-xiii Configuring Private VLANs.C H A P T E R 11 Configuring VLANs This chapter describes how to configure VLANs for the Catalyst 6000 family switches. VLANs allow you to group ports on a switch to limit unicast.

These VLANs are organized into several ranges. it is known as port-based. When you assign switch ports to VLANs using this method. you use each range slightly differently.4 11-2 78-13315-02 . 4095 Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6. Only one IP address at a time can be assigned to the in-band interface. For example. Some of these VLANs are propagated to other switches in the network when you use a management protocol. all the end stations in a particular IP subnet belong to the same VLAN. Other VLANs are not propagated and you must configure them on each applicable switch. the previous IP address and VLAN assignment are overwritten. Traffic between VLANs must be routed. or static. The in-band (sc0) interface of a switch can be assigned to any VLAN. If you change the IP address and assign the interface to a different VLAN. so you can access another switch on the same VLAN directly without a router. Port VLAN membership on the switch is assigned manually on a port-by-port basis. such as the VLAN Trunking Protocol (VTP).Chapter 11 Understanding How VLANs Work Configuring VLANs Figure 11-1 VLANs as Logically Defined Networks Engineering VLAN Cisco router Marketing VLAN Accounting VLAN Floor 3 Fast Ethernet Floor 2 Floor 1 16751 VLANs are often associated with IP subnetworks. VLAN membership. 1002–1024. There are three ranges of VLANs: • • • Normal-range VLANs: 1–1000 Extended-range VLANs: 1025–4094 Reserved-range VLANs: 0.1Q standard. VLAN Ranges Catalyst 6000 family switches support 4096 VLANs in accordance with the IEEE 802.

you can set the parameters as follows: Note Ethernet VLANs 1 and 1025–4094 can use the defaults only. FDDI. If you use these devices. or Token Ring Concentrator Relay Function (TrCRF) VLAN state: active or suspended Multi-Instance Spanning Tree Protocol (MISTP) instance Private VLAN type: primary. and delete these VLANs. You cannot see or use these VLANs but you can map N/A nonreserved VLANs to these reserved VLANs when necessary. you must allow the required number of VLANs for them. For Ethernet VLANs only. or none Security Association Identifier (SAID) Catalyst 6000 Family Software Configuration Guide—Releases 6. use. community. FDDINET. and delete these VLANs. with the following exception: FlexWAN modules and routed ports automatically allocate a sequential block of internal VLANs starting at VLAN 1025. you can create. You can create. Used for Ethernet VLANs. Not supported on Catalyst 6000 family switches. Cisco defaults for FDDI and Token Ring. N/A 1006–1009 Reserved range Cisco defaults.3 and 6. You can use this VLAN but you cannot Yes delete it. • • • • • • • VLAN number VLAN name VLAN type: Ethernet.Chapter 11 Configuring VLANs Understanding How VLANs Work Table 1 describes the VLAN ranges. 4095 1 2–1000 1001 1002–1005 Range Reserved range Normal range Normal range Normal range Reserved range Usage For system use only. You cannot delete these VLANs. You can map nonreserved VLANs to these reserved VLANs when necessary. Not currently used but may be used for N/A defaults in the future. Token Ring Bridge Relay Function (TrBRF).4 78-13315-02 11-3 . Propagated by VTP (Y/N) N/A Cisco default. isolated. use. Table 11-1 VLAN Ranges VLANs 0. No 1010–1024 Reserved range 1025–4094 Extended range Configurable VLAN Parameters Whenever you create or modify VLANs 2–1005. two-way community. Yes You cannot create or use this VLAN. May be available Yes in the future. You cannot see or use these VLANs.

the SAID for VLAN 4050 is 104050) VLANs 2–1000 are pruning eligible. requires a different VLAN number for each media type Source routing bridge mode for Token Ring VLANs: source-routing bridge (SRB) or source-routing transparent bridge (SRT) Backup for TrCRF VLAN Maximum hops VLAN All-Routes Explorer frames (ARE) and Spanning Tree Explorer frames (STE) for Token Ring Remote Switched Port Analyzer (RSPAN) Default VLAN Configuration Table 2 shows the default VLAN configuration for the Catalyst 6000 family switches.Chapter 11 Understanding How VLANs Work Configuring VLANs • • • • • • • • • • Maximum transmission unit (MTU) for the VLAN Ring number for FDDI and TrCRF VLANs Bridge identification number for TrBRF VLANs Parent VLAN number for TrCRF VLANs STP type for TrCRF VLANs: IEEE. or auto VLAN to use when translating from one VLAN media type to another (VLANs 1–1005 only). Table 11-2 VLAN Default Configuration Feature Native (default) VLAN Port VLAN assignments VLAN state MTU size SAID value Pruning eligibility MAC address reduction Spanning tree mode Default FDDI VLAN Default FDDI NET VLAN Default Token Ring TrBRF VLAN Default Token Ring TrCRF VLAN Spanning Tree Protocol (STP) version for TrBRF VLAN Default Value VLAN 1 All ports assigned to VLAN 1 Token Ring ports assigned to VLAN 1003 (trcrf-default) Active 1500 bytes 4472 bytes for Token Ring VLANs 100.4 11-4 78-13315-02 . IBM.3 and 6.000 plus the VLAN number (for example. VLANs 1025–4094 are not pruning eligible Disabled PVST+ VLAN 1002 VLAN 1004 VLAN 1005 (trbrf-default) with bridge number 0F VLAN 1003 (trcrf-default) IBM Catalyst 6000 Family Software Configuration Guide—Releases 6. the SAID for VLAN 8 is 100008.

See Chapter 10. If you wish to use VTP to maintain global VLAN configuration information on your network. page 11-v Modifying Normal-Range VLANs. “Configuring VTP” for configuring VTP. Catalyst 6000 Family Software Configuration Guide—Releases 6. if you do not specify a VLAN type. (You cannot use VTP to manage extended-range VLANs 1025–4094. Normal-Range VLAN Configuration Guidelines Follow these guidelines when creating and modifying normal-range VLANs 2–1000 in your network: • • The default VLAN type is Ethernet.Chapter 11 Configuring VLANs Configuring Normal-Range VLANs Table 11-2 VLAN Default Configuration (continued) Feature TrCRF bridge mode Remote switched port analyzer (RSPAN) Default Value SRB Disabled Configuring Normal-Range VLANs These sections explain how to configure normal-range VLANs 2–1000: • • • Normal-Range VLAN Configuration Guidelines. • Creating Normal-Range VLANs You can create one VLAN at a time or you can create a range of VLANs with a single command.3 and 6. If you use these devices.4 78-13315-02 11-5 . you cannot specify a name. you must allow for the number of VLANs required. page 11-v Creating Normal-Range VLANs. starting at VLAN 1025. perform this task in privileged mode: Task Step 1 Step 2 Command set vlan vlan [name name] [said said] [mtu mtu] [translation vlan] show vlan [vlan] Create a normal-range Ethernet VLAN. If you create a range of VLANs. page 11-vi Note You cannot configure or modify normal-range VLAN 1. Verify the VLAN configuration. configure VTP before you create any normal-range VLANs.) FlexWAN modules and routed ports automatically allocate a number of VLANs for their own use. To create a normal-range VLAN. VLAN names must be unique. the VLAN will be an Ethernet VLAN.

-----. . Vlan 520 configuration successful Console> (enable) show vlan 500-520 VLAN Name Status IfIndex Mod/Ports.Chapter 11 Configuring Extended-Range VLANs Configuring VLANs This example shows how to create normal-range VLANs and verify the configuration when the switch is in Per VLAN Spanning Tree + (PVST+) mode: Console> (enable) set vlan 500-520 Vlan 500 configuration successful Vlan 501 configuration successful Vlan 502 configuration successful Vlan 503 configuration successful . 520 active 362 VLAN Type SAID MTU Parent RingNo BrdgNo Stp BrdgMode Trans1 Trans2 ---. .--------.-----500 enet 100500 1500 0 0 501 enet 100501 1500 0 0 502 enet 100502 1500 0 0 503 enet 100503 1500 0 0 . perform this task in privileged mode: Task Step 1 Step 2 Command Modify an existing normal-range VLAN. .------. Vlans ---.----.-------.----.-----.---. page 11-vii Creating Extended-Range VLANs. page 11-vii Catalyst 6000 Family Software Configuration Guide—Releases 6. .-----------------------500 active 342 501 active 343 502 active 344 503 active 345 . 520 enet 100520 1500 0 0 VLAN AREHops STEHops Backup CRF ---.---------Console> (enable) Modifying Normal-Range VLANs To modify the VLAN parameters on an existing normal-range VLAN.-----.------. show vlan [vlan] Configuring Extended-Range VLANs These sections explain how to configure extended-range VLANs 1025–4094: • • Extended-Range VLAN Configuration Guidelines.---------.------.3 and 6.-----. set vlan vlan [name name] [state {active | suspend}] [said said] [mtu mtu] [translation vlan] Verify the VLAN configuration.4 11-6 78-13315-02 . . .-------------------------------.

After you enable MAC address reduction. Note If you wish to use extended-range VLANs and you have existing 802. See the “Deleting 802. If you have any VLANs within the range required by the FlexWAN module. all other parameters for extended-range VLANs use the system defaults only. then VLAN 4089. If not enough VLANs are available for the FlexWAN module. If you use these devices. however. you must allow the required number of VLANs for them and must not use the lower-range VLANs starting with VLAN 1025. You must enable MAC address reduction in order to use extended-range VLANs. because VLANs are never allocated from the user’s VLAN area. some ports may not work. You can only create and delete extended-range VLANs from the CLI or SNMP. they must be statically configured on each switch. the switch may allocate VLANs for routed ports or FlexWAN modules.Chapter 11 Configuring VLANs Configuring Extended-Range VLANs Extended-Range VLAN Configuration Guidelines Follow these guidelines to create extended-range VLANs 1025–4094: • • • • • • • You can only create Ethernet-type VLANs in the extended range. You should reboot the switch if you move the FlexWAN module. use VLAN 4090. you cannot disable it as long as any extended-range VLANs exist.1Q-to-ISL mappings in your system. all of the VLANs required will not be allocated. which provides IDs for extended-range VLANs. Caution If you move a FlexWAN module from one slot to another on the same switch.4 78-13315-02 11-7 . You can configure private VLAN parameters and RSPAN for extended-range VLANs. You cannot use extended-range VLANs if you have dot1q-to-isl mappings. you must delete the mappings. Catalyst 6000 Family Software Configuration Guide—Releases 6. You must use the highest VLANs first. it will allocate another block of VLANs without deleting the previous block.1Q-to-ISL VLAN Mappings” section on page 11-xi for more information. you must first enable MAC address reduction. The switch may allocate a block of VLANs from the extended range for internal purposes. For example. The block of VLANs is always allocated starting from VLAN 1025. and so forth. Caution FlexWAN modules and routed ports automatically allocate a sequential block of internal VLANs starting at VLAN 1025. for example. Creating Extended-Range VLANs To create extended-range VLANs.3 and 6. You cannot use VTP to manage these VLANs.

---------.---. page 11-ix Deleting Reserved-to-Nonreserved VLAN Mappings.1Q trunks to ISL trunks on the Catalyst 6000 family switches. Note If you use method 1.---.-----.-------------------------------.1Q-to-ISL VLAN Mappings.-------.1Q VLANs to ISL VLANs.--------.---------. page 11-x Mapping 802. This example shows how to enable MAC address reduction and create an extended-range Ethernet VLAN: Console> (enable) set spantree macreduction enable MAC address reduction enabled Console> (enable) set vlan 2000 Vlan 2000 configuration successful Console> (enable) show vlan 2000 VLAN Name Status IfIndex Mod/Ports.---------.------. 2.----. This section describes how to map VLANs to VLANs: • • • • Mapping Reserved VLANs to Nonreserved VLANs.-----.-----2000 enet 102000 1500 0 0 VLAN Inst DynCreated RSPAN ---. page 11-x Deleting 802.-------2000 static disabled VLAN AREHops STEHops Backup CRF 1q VLAN ---. From non-Cisco devices in your network using VLANs 1006–1024 to nonreserved VLANs on the Catalyst 6000 family switches.------.Chapter 11 Mapping VLANs to VLANs Configuring VLANs To enable MAC address reduction and create an Ethernet VLAN in the extended range. From VLANs on non-Cisco devices on 802. if you use method 2. you can use extended-range VLANs (1025–4094) on the switch.----. Verify the VLAN configuration. Vlans ---.3 and 6.------Console> (enable) Mapping VLANs to VLANs You can map VLANs to other VLANS on the Catalyst 6000 family switches in two ways: 1. you can retain mappings from a previous Catalyst 6000 family software release but you cannot use extended-range VLANs.------. Create a VLAN. page 11-xi Catalyst 6000 Family Software Configuration Guide—Releases 6.-----------------------2000 VLAN2000 active 61 VLAN Type SAID MTU Parent RingNo BrdgNo Stp BrdgMode Trans1 Trans2 ---. perform this task in privileged mode: Task Step 1 Step 2 Step 3 Command set spantree macreduction {enable | disable} set vlan vlan show vlan [vlan] Enable MAC address reduction.4 11-8 78-13315-02 .-----.-----.

This example shows how to clear old VLAN mappings. Mappings that are marked true can be used by the system. Note Reserved VLAN mappings are entered on the table in the order in which you map them. true or false). You can only map Ethernet VLANs to Ethernet VLANs. Catalyst 6000 Family Software Configuration Guide—Releases 6.4 78-13315-02 11-9 . Note If you have dot1q-to-isl VLAN mappings from a previous Catalyst 6000 family switch software release. To map a reserved VLAN to a nonreserved VLAN. you can clear the dot1q-to-isl mappings and then use those reserved VLANs. Map a reserved VLAN to a nonreserved VLAN. the line where it existed will not display on the table. this includes normal-range and extended-range VLANs. However. These restrictions apply when mapping reserved VLANs to nonreserved VLANs: • • • You can create up to eight reserved-to-nonreserved VLAN mappings on the switch. and verify the mappings on the mapping table: Console> (enable) clear vlan mapping dot1q all All dot1q vlan mapping entries deleted Console> (enable) set vlan mapping reserved 1020 non-reserved 4070 Vlan 1020 successfully mapped to 4070. Mappings marked false cannot be used by the system. Optionally. Nonreserved VLANs are any VLANs that are not reserved by Cisco. map a reserved VLAN. If you delete a mapping. Console> (enable) show vlan mapping Reserved vlan Non-Reserved vlan Effective ---------------------------------------------------1008 63 false 1010 4065 true 1011 4066 true 1020 4070 true The Effective column in the mapping table indicates whether the mapping has taken effect (that is. clear old dot1q-to-isl VLAN mappings.Chapter 11 Configuring VLANs Mapping VLANs to VLANs Mapping Reserved VLANs to Nonreserved VLANs You can map reserved-range VLANs to any nonreserved VLANs that are not in use. perform this task in privileged mode: Task Step 1 Step 2 Step 3 Command clear vlan mapping dot1q all set vlan mapping reserved {reserved_vlan} non-reserved {nonreserved_vlan} show vlan mapping If necessary. Verify the VLAN mapping. you cannot use the mapped VLANs to map reserved VLANs to nonreserved VLANs. Reserved VLAN mappings are local to each switch. You must configure the VLAN mappings on all applicable switches in the network.3 and 6. the next mapping you create will appear where the old one was deleted.

1Q VLANs to ISL VLANs Your network might have non-Cisco devices connected to the Catalyst 6000 family switches through 802. 802. These restrictions apply when mapping 802.1Q-to-ISL VLAN mappings on the switch. Verify the mapping table entry has been cleared. you cannot use any of the extended-range VLANs for any other purpose.1Q VLANs to ISL VLANs: • • • • If there are any extended-range VLANs present on the switch. you can map 802. When you clear all entries from the mapping table at once. You can configure up to eight 802. Do not enter the native VLAN of any 802. 802. you can delete the mappings one at a time or all at once. Clear the nonreserved VLAN.1Q trunks. The valid range of VLANs specified in the IEEE 802. perform this task in privileged mode: Task Step 1 Step 2 Step 3 Command clear vlan mapping reserved {reserved_vlan | all} clear vlan vlan Clear the reserved VLAN. Catalyst 6000 Family Software Configuration Guide—Releases 6. To delete reserved VLAN mappings. Note that if you use any VLANs in the extended range (1025–4094) for dot1q mappings. 1002–1024.1Q VLANs to Ethernet-type ISL VLANs.1Q VLAN numbers greater than 1000 must be mapped to an ISL VLAN in order to be recognized and forwarded by Cisco switches. The valid range of user-configured Inter-Switch Link (ISL) VLANs is 1–1000.1Q VLANs-to-ISL VLANs.3 and 6.1Q standard is 0–4095. show vlan mapping This example shows how to clear a single mapping: Console> (enable) clear vlan mapping reserved 1010 Vlan 1010 mapping entry deleted Console> (enable) This example shows how to clear all reserved VLAN mappings: Console> (enable) clear vlan mapping reserved all All reserved vlan mapping entries deleted Console> (enable) Mapping 802.1Q trunks or traffic from a non-Cisco switch that has VLANs in the Catalyst 6000 family reserved range.1Q trunk in the mapping table.Chapter 11 Mapping VLANs to VLANs Configuring VLANs Deleting Reserved-to-Nonreserved VLAN Mappings To clear the mappings for reserved-to-nonreserved VLAN mappings.1Q VLAN numbers greater than 1000 to ISL VLAN numbers. In a network environment with non-Cisco devices connected to Cisco switches through 802. you cannot map any new 802. the table is completely cleared and the nonreserved VLANs still exist in the list of VLANs. You can only map 802.4 11-10 78-13315-02 .1Q VLANs in the range 1–1000 are automatically mapped to the corresponding ISL VLAN.

Chapter 11 Configuring VLANs Mapping VLANs to VLANs • When you map an 802. and verify the configuration: Console> (enable) set vlan mapping dot1q 2000 isl 200 802.1Q VLAN to an ISL VLAN. perform this task in privileged mode: Task Step 1 Step 2 Command clear vlan mapping dot1q {dot1q_vlan | all} show vlan mapping Delete an 802. The set vlan mapping dot1q dot1q_vlan isl valid range for dot1q_vlan is 1001–4095. and 4000 to ISL VLANs 200. and 400. Verify the VLAN mapping.1Q-to-ISL VLAN Mappings To delete an 802.1Q-to-ISL VLAN mapping.1Q VLANs 2000.1Q VLAN to an ISL VLAN. show vlan mapping Step 2 This example shows how to map 802.1Q-to-ISL VLAN mapping. traffic on 802.1Q VLAN 2000: Console> (enable) clear vlan mapping dot1q 2000 Vlan 2000 mapping entry deleted Console> (enable) This example shows how to delete all 802. Verify the VLAN mapping.1Q VLAN corresponding to the mapped ISL VLAN is blocked. The valid isl_vlan range for isl_vlan is 1–1000.3 and 6.1Q VLAN 200 is blocked.1Q-to-ISL VLAN mappings: Console> (enable) clear vlan mapping dot1q all All vlan mapping entries deleted Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. if you map 802.1Q VLAN to an ISL Ethernet VLAN.4 78-13315-02 11-11 . traffic on the 802. perform this task in privileged mode: Task Step 1 Command Map an 802. 3000.1q vlan ISL vlan Effective -----------------------------------------2000 200 true 3000 300 true 4000 400 true Console> (enable) Deleting 802. • To map an 802. VLAN mappings are local to each switch. Make sure you configure the same VLAN mappings on all appropriate switches in the network.1q vlan 2000 is existent in the mapping table Console> (enable) set vlan mapping dot1q 3000 isl 300 Vlan mapping successful Console> (enable) set vlan mapping dot1q 4000 isl 400 Vlan mapping successful Console> (enable) show vlan mapping 802. For example. This example shows how to delete the VLAN mapping for 802. 300.1Q VLAN 2000 to ISL VLAN 200.

---------. perform this task in privileged mode: Task Command set vlan vlan mod/port show vlan [vlan] show port [mod[/port]] Step 1 Step 2 Assign one or more switch ports to a VLAN.----.-----.-------------4/10 none none <.> Last-Time-Cleared -------------------------Tue Jun 6 2000. Vlans ---.---------Console> (enable) show port 4/10 Port Name Status Vlan Duplex Speed Type ----. Verify the port VLAN membership.----.------. and Gigabit Ethernet ports to Ethernet-type VLANs.-----.-----------4/10 connected 560 a-half a-100 10/100BaseTX Port AuxiliaryVlan AuxVlan-Status ----.-------------------------------.-----------------------560 Engineering active 348 4/10 VLAN Type SAID MTU Parent RingNo BrdgNo Stp BrdgMode Trans1 Trans2 ---.---. For example. 16:45:18 Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.output truncated.-----560 enet 100560 1500 0 0 VLAN AREHops STEHops Backup CRF ---.------.-----.---------. VLAN 1 modified. This example shows how to assign switch ports to a VLAN and verify the assignment: Console> (enable) set vlan 560 4/10 VLAN 560 modified.----------------------560 4/10 Console> (enable) show vlan 560 VLAN Name Status IfIndex Mod/Ports.Chapter 11 Assigning Switch Ports to a VLAN Configuring VLANs Assigning Switch Ports to a VLAN A VLAN created in a management domain remains unused until you assign one or more switch ports to the VLAN. Note Make sure you assign switch ports to a VLAN of the proper type. Fast Ethernet.-----.------------.----. To assign one or more switch ports to a VLAN. VLAN Mod/Ports ---.-----.-----------------.---------.. or you can create the VLAN and specify the module and ports in a single step. You can create a new VLAN and then specify the module and ports later.------.-------..--------..3 and 6. assign Ethernet.4 11-12 78-13315-02 ..

When you delete a normal-range VLAN in VTP transparent mode. You can delete a single VLAN or a range of VLANs. Command clear vlan vlan This example shows how to delete a VLAN (in this case. Such ports remain associated with the VLAN (and thus inactive) until you assign them to a new VLAN.Chapter 11 Configuring VLANs Deleting a VLAN Deleting a VLAN Follow these guidelines for deleting VLANs: • • • • When you delete a normal-range Ethernet VLAN in VTP server mode. Community. the VLAN is deleted only on the current switch. page 11-xxii Deleting an Isolated. page 11-xxi Deleting a Private VLAN. To delete a Token Ring TrBRF VLAN.3 and 6. page 11-xxii Deleting a Private VLAN Mapping. the switch is a VTP server): Console> (enable) clear vlan 500 This command will deactivate all ports on vlan(s) 500 Do you want to continue(y/n) [n]?y Vlan 500 deleted Console> (enable) This command will deactivate all ports on vlan(s) 10 All ports on normal range vlan(s) 10 will be deactivated in the entire management domain. or Two-Way Community VLAN. You can delete an extended-range VLAN only on the switch where it was created. page 11-xxiii Private VLAN Support on the MSFC. To delete a VLAN on the switch. Caution When you delete a VLAN. or delete the child TrCRFs. page 11-xiv Private VLAN Configuration Guidelines. perform this task in privileged mode: Task Delete a VLAN. Do you want to continue(y/n) [n]? Configuring Private VLANs These sections describe how private VLANs work: • • • • • • • • Understanding How Private VLANs Work. page 11-xxiii Catalyst 6000 Family Software Configuration Guide—Releases 6. page 11-xv Creating a Primary Private VLAN. you must first reassign its child TrCRFs to another parent TrBRF. the VLAN is removed from all switches in the VTP domain. any ports assigned to that VLAN become inactive.4 78-13315-02 11-13 . page 11-xviii Viewing the Port Capability of a Private VLAN Port.

There are three types of private VLAN ports: promiscuous. and a series of community or two-way community VLANs. The traffic from an isolated port is blocked on all adjacent ports within its PVLAN and can only be received by its promiscuous ports. You can extend private VLANs across multiple Ethernet switches by trunking the primary. • • Note With software release 6. Community ports communicate among themselves and with their promiscuous ports. isolated. community. isolated. Within a private VLAN are four distinct classifications of VLANs: a single primary VLAN. Isolated VLAN—Used by isolated ports to communicate to the promiscuous ports.Chapter 11 Configuring Private VLANs Configuring VLANs Understanding How Private VLANs Work Private VLANs provide Layer-2 isolation between ports within the same private VLAN on the Catalyst 6000 family switches. and community.3 and 6. or two-way community VLAN. Privacy is granted at the Layer 2 level by blocking outgoing traffic to all isolated ports. Traffic received from an isolated port is forwarded to all promiscuous ports only. Both outbound and inbound traffic can be carried on the same VLAN allowing VLAN-based features such as VACLs to be applied in both directions on a per-community (per customer) basis. You must define each supporting VLAN within a private VLAN structure before you can configure the private VLAN: • • Primary VLAN—Conveys incoming traffic from the promiscuous port to all other promiscuous. backup servers. and two-way community ports. If you choose. you can use two-way community VLANs to perform an inverse mapping from the primary VLAN to the secondary VLAN when the traffic crosses the boundary of a private VLAN through an MSFC promiscuous port. LocalDirector.4 11-14 78-13315-02 . community.2(1) and later releases. isolated. a single isolated VLAN. and administrative workstations. Community VLAN—Unidirectional VLAN used by a group of community ports to communicate among themselves and transmit traffic to outside the PVLAN through the designated promiscuous port. you must bind them together and associate them to the promiscuous port. These ports are isolated at Layer 2 from all other ports in other communities or isolated ports within their private VLAN. An isolated port has complete Layer 2 separation from other ports within the same private VLAN with the exception of the promiscuous port. community. and any community or two-way community VLANs to other switches that support private VLANs. Catalyst 6000 Family Software Configuration Guide—Releases 6. All isolated ports are assigned to an isolated VLAN where this hardware function occurs. and a second VLAN is designated as either an isolated. Ports belonging to a private VLAN are associated with a common set of supporting VLANs that are used to create the private VLAN structure. After designating the VLANs. or two-way community VLANs in this private VLAN. you assign two or more normal VLANs in the normal VLAN range: one VLAN is designated as a primary VLAN. • • • A promiscuous port communicates with all other private VLAN ports and is the port you use to communicate with routers. you can then designate additional VLANs as separate isolated. Two-way community VLAN—Bidirectional VLAN used by a group of community ports to communicate among themselves and to and from community ports from and to the Multilayer Switch Feature Card (MSFC). To create a private VLAN.

The servers only require the ability to communicate with a default gateway to gain access to end points outside the VLAN itself. you can remap as many isolated or community VLANs as desired. Bind the isolated and/or community VLAN(s) to the primary VLAN and assign the isolated or community ports.Chapter 11 Configuring VLANs Configuring Private VLANs In an Ethernet-switched environment. an MSFC port does not have this limitation. Private VLAN Configuration Guidelines Follow these guidelines to configure private VLANs: Note In this section. – BPDU guard protection is activated. you can connect a nontrunk promiscuous port to the “server port” of a LocalDirector to remap a number of isolated or community VLANs to the server VLAN so that the LocalDirector can load balance the servers present in the isolated or community VLANs. regardless of ownership. With a nontrunk promiscuous port. backup server. Designate the ports to which the default gateway(s). You will achieve these results: – Isolated/community VLAN spanning tree properties are set to those of the primary VLAN. By incorporating these stations. you can do the following: • • • Designate the server ports as isolated to prevent any interserver communication at Layer 2. – Access ports become host ports. You have the option of using private VLAN communities. the term community VLAN is used for both unidirectional community VLANs and two-way community VLANs unless specifically differentiated. – VLAN membership becomes static.4 78-13315-02 11-15 . Note A two-way community VLAN can only be mapped on the MSFC promiscuous port (it cannot be mapped on nontrunk or other types of promiscuous ports). however. but you can only use one isolated VLAN. • • Set up the automatic VLAN translation that maps the isolated and community VLANs to the primary VLAN on the promiscuous port(s). On an MSFC port or a nontrunk promiscuous port. or you can use a nontrunk promiscuous port to monitor and/or back up all the private VLAN servers from an administration workstation. you need to designate a community VLAN for each community. An MSFC port can only connect an MSFC router. You have the option of designating one VLAN as an isolated VLAN.3 and 6. while a nontrunk promiscuous port can remap to only one primary VLAN. you can connect a wide range of devices as “access points” to a private VLAN. or LocalDirector are attached as promiscuous to allow all stations to have access to these gateways. Set the nontrunk ports or the MSFC ports as promiscuous ports. into one private VLAN. • • • • Designate one VLAN as the primary VLAN. You only need to allocate one IP subnet to the entire group of stations because all stations reside in one common private VLAN. For example. Catalyst 6000 Family Software Configuration Guide—Releases 6. you can assign an individual VLAN and associated IP subnet to each individual or common group of stations. You must set VTP to transparent mode. Reduce VLAN consumption.

Private VLANs can use VLANs 2 through 1000 and 1025 through 4096. or have dynamic VLAN memberships. or community port for the modules listed in Table 3. you cannot change the VTP mode to client or server mode. Table 11-3 Modules with Ports Listed by ASIC Groups Module Number WS-X6224-100FX-MT Description Ports by ASIC Ports 13–24 Ports 25–36 Ports 37–48 24-port 100FX Multimode MT-RJ Ports 1–12 WS-X6248-RJ-45 48-port 10/100TX RJ-45 Ports 1–12 Ports 13–24 Ports 25–36 Ports 37–48 WS-X6248-TEL 48-Port 10/100TX RJ-21 Ports 1–12 Ports 13–24 Ports 25–36 Ports 37–48 Catalyst 6000 Family Software Configuration Guide—Releases 6. channeling. however it cannot be configured as a promiscuous port.3 and 6. If you delete either the primary or secondary VLAN. isolated. An isolated or community VLAN can have only one primary VLAN associated with it. because VTP does not support private VLAN types and mapping propagation. a warning message displays and the command is rejected.4 11-16 78-13315-02 . • • • • • Note With software release 6. If you attempt such a configuration. with the exception of MSFC ports that always have trunking activated. in a private VLAN. sc0. When configuring private VLANs.3(1) and later releases. Enter the show port command to verify that the VLAN has no access ports assigned to it. You can configure VLANs as primary.Chapter 11 Configuring Private VLANs Configuring VLANs • • After you configure a private VLAN. isolated. the sc0 port can be configured as a private VLAN port. – You cannot set private VLAN ports to trunking mode. the ports associated with the VLAN become inactive. or community only if no access ports are currently assigned to the VLAN. A primary VLAN can have one isolated VLAN and/or multiple communities associated with it. note the hardware and software interactions: – You cannot use the inband port. – You cannot set ports belonging to the same ASIC where one port is set to trunking mode or a SPAN destination and another is set to a promiscuous.

isolated.3 and 6. STP parameters do not necessarily propagate to ensure that the spanning tree topologies match. and community VLANs together. isolated. You cannot configure a destination SPAN port as a private VLAN port and vice versa. You cannot use a remote SPAN VLAN (RSPAN) for a private VLAN. You should disable a root bridge with private VLANs and MAC address reduction. and configure the root bridge with any priority higher than the highest priority range used by any nonroot bridge. • • • • • • Catalyst 6000 Family Software Configuration Guide—Releases 6. These priorities and parameters automatically propagate from the primary VLAN to the isolated and community VLANs. If you enable MAC address reduction on a Catalyst 6000 series switch. You should manually check the STP configuration to ensure that the primary. isolated. • In networks with some switches using MAC address reduction. This configuration maintains consistent spanning tree topologies between associated primary. BPDU guard mode is system wide and is enabled after you add the first port to a private VLAN. Be consistent with the ranges employed by the MAC address reduction feature regardless of whether it is enabled on the system. and community VLANs’ spanning tree topologies match. if you enable MAC address reduction on some switches and disable it on others (mixed environment). and others not using MAC address reduction. MAC address reduction allows only discrete levels and uses all intermediate values internally as a range. and community VLANs and avoids possible loss of connectivity.4 78-13315-02 11-17 . Changes will be applied to the primary VLAN and will propagate to the isolated and community VLANs. any change to the configuration of a primary VLAN propagates to all • corresponding isolated and community VLANs. Otherwise. and you cannot change the isolated or community VLANs. you might want to enable MAC address reduction on all the switches in your network to ensure that the STP topologies of the private VLANs match.Chapter 11 Configuring VLANs Configuring Private VLANs Table 11-3 Modules with Ports Listed by ASIC Groups (continued) Module Number WS-X6348-RJ-45 Description 48-port 10/100TX RJ-45 Ports by ASIC Ports 1–12 Ports 13–24 Ports 25–36 Ports 37–48 WS-X6024-10FL-MT 24-port 10BASE-FL MT-RJ Ports 1–12 Ports 13–24 • • Isolated and community ports should run BPDU guard features to prevent spanning tree loops due to misconfigurations. A source SPAN port can belong to a private VLAN. or use SPAN on only one VLAN to separately monitor egress or ingress traffic. You can create private VLANs that run in MISTP mode as follows: – If you disable MISTP. – If you enable MISTP. in a network where private VLANs are configured. Primary VLANs and associated isolated/community VLANs must have the same spanning tree configuration. you will have to use the default bridge priorities to make sure that the root bridge is common to the primary VLAN and to all its associated isolated and community VLANs. You can use VLAN-based SPAN (VSPAN) to span primary. you can only configure the MISTP instance with the primary VLAN.

and community VLANs. Bind the isolated. or two-way community VLAN(s). You cannot use policy-based routing (PBR) on a private VLAN interface. see the “Configuring ACLs on Private VLANs” section on page 16-26. set pvlan mapping primary_vlan {isolated_vlan | community_vlan | twoway_community_vlan} mod/ports show pvlan [vlan] show pvlan mapping Step 5 Step 6 Catalyst 6000 Family Software Configuration Guide—Releases 6. the Cisco IOS ACL automatically maps to the associated isolated and community VLANs. You get an error message if you try to apply a policy to a private VLAN interface using the ip policy route-map route_map_name command. • • • • • • Creating a Primary Private VLAN To create a primary private VLAN. community.Chapter 11 Configuring Private VLANs Configuring VLANs • • • IGMP snooping and multicast shortcuts are not supported in private VLANs. community. community. or two-way community VLAN(s) to the primary VLAN.4 11-18 78-13315-02 . or promiscuous ports. community. community.3 and 6. Deleting the corresponding mapping is not sufficient. or two-way community VLAN to the primary private VLAN on the promiscuous port. You cannot enable EtherChannel on isolated. Output ACLs need to be configured on both the two-way community VLANs and the primary VLAN in order to be applied to all outgoing traffic from the MSFC. You cannot set a VLAN to a private VLAN if the VLAN has dynamic access control entries (ACEs) configured on it. Verify the primary private VLAN configuration. You can stop Layer 3 switching on an isolated or community VLAN by destroying the binding of that VLAN with its primary VLAN. or two-way set pvlan primary_vlan {isolated_vlan | community port(s) to the primary private VLAN. community_vlan | twoway_community_vlan} [mod/ports | sc0] Map the isolated. Set the isolated. Associate the isolated. If you map a Cisco IOS ACL to a primary VLAN. isolated. You can apply different VACLs and quality of service (QoS) ACLs to primary. You cannot map Cisco IOS ACLs to an isolated or community VLAN. perform this task in privileged mode: Task Step 1 Step 2 Step 3 Step 4 Command set vlan vlan pvlan-type primary set vlan vlan pvlan-type {isolated | community | twoway-community} set pvlan primary_vlan {isolated_vlan | community_vlan | twoway_community_vlan} Create the primary private VLAN. Note For information on configuring ACLs.

switches with promiscuous ports. Note If you are using the MSFC for your promiscuous port in your private VLAN. community. or two-way community VLANs to the private VLAN using the set pvlan primary_vlan {isolated_vlan | community_vlan | twoway_community_vlan} mod/port command. or promiscuous ports (typically. you do not need to create private VLANs and you can prune the private VLANs from the trunks for security reasons. This example shows how to specify VLAN 7 as the primary VLAN: Console> (enable) set vlan 7 pvlan-type primary Vlan 7 configuration successful Console> (enable) This example shows how to specify VLAN 901 as the isolated VLAN and VLANs 902 and 903 as community VLANs: Console> Vlan 901 Console> Vlan 902 Console> Vlan 903 Console> (enable) set vlan 901 pvlan-type isolated configuration successful (enable) set vlan 902 pvlan-type community configuration successful (enable) set vlan 903 pvlan-type community configuration successful (enable) This example shows how to bind VLAN 901 to primary VLAN 7 and assign port 4/3 as the isolated port: Console> (enable) set pvlan 7 901 4/3 Successfully set the following ports to Private Vlan 7. or two-way community port(s) and associated isolated. community. and all intermediate switches that need to carry the private VLANs on their trunks. or two-way community ports.Chapter 11 Configuring VLANs Configuring Private VLANs Note You can bind the isolated. On the edge switches that do not have any isolated. two-way community.901: 4/3 Console> (enable) This example shows how to bind VLAN 902 to primary VLAN 7 and assign ports 4/4 through 4/6 as the community port: Console> (enable) set pvlan 7 902 4/4-6 Successfully set the following ports to Private Vlan 7. community. or use 16/1 if the supervisor engine is in slot 2.902:4/4-6 Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. Note Ports do not have to be on the same switch as long as the switches are trunk connected and the private VLAN has not been removed from the trunk.3 and 6. Note You must enter the set pvlan command everywhere a private VLAN needs to be created.4 78-13315-02 11-19 . access switches with no private ports). community. use 15/1 as the MSFC mod/port number if the supervisor engine is in slot 1. which includes switches with isolated.

-----.-------.-----7 enet 100010 1500 0 0 VLAN DynCreated RSPAN ---. Vlans ---.-----7 enet 100010 1500 0 0 VLAN DynCreated RSPAN ---.---------.------.--------7 901 7 902 7 903 show pvlan Secondary-Type -------------isolated community community Ports -----------4/3 4/4-6 4/7-9 Catalyst 6000 Family Software Configuration Guide—Releases 6.-----------------------7 VLAN0007 active 35 4/4-6 VLAN Type SAID MTU Parent RingNo BrdgNo Stp BrdgMode Trans1 Trans2 ---. 3/1.----------------.Chapter 11 Configuring Private VLANs Configuring VLANs This example shows how to bind VLAN 903 to primary VLAN 7 and assign ports 4/7 through 4/9 as the community ports: Console> (enable) set pvlan 7 903 Successfully set association between 7 and 903.----------------7 901 Isolated 4/3 7 902 Community 4/4-6 7 903 Community 4/7-9 Console> (enable) show vlan 902 VLAN Name Status IfIndex Mod/Ports. Vlans ---.------.---------.------.---------.----.---------.---.-------------------------------. Console> (enable) set pvlan 7 903 4/7-9 Successfully set the following ports to Private Vlan 7.----------------7 902 Isolated 4/4-6 Console> (enable) Primary Secondary ------.--------.-------7 static disabled VLAN AREHops STEHops Backup CRF 1q VLAN ---. for each isolated or community VLAN: Console> (enable) set pvlan mapping 7 901 3/1 Successfully set mapping between 7 and 901 on 3/1 Console> (enable) set pvlan mapping 7 902 3/1 Successfully set mapping between 7 and 902 on 3/1 Console> (enable) set pvlan mapping 7 903 3/1 Successfully set mapping between 7 and 903 on 3/1 This example shows how to verify the private VLAN configuration: Console> (enable) show vlan 7 VLAN Name Status IfIndex Mod/Ports.----.---------.-----.--------.------.------Primary Secondary Secondary-Type Ports ------.-----.-------7 static disabled VLAN AREHops STEHops Backup CRF 1q VLAN ---.---.------Primary Secondary Secondary-Type Ports ------.--------.903:4/7-9 Console> (enable) This example shows how to map the isolated/community VLAN to the primary VLAN on the promiscuous port.------.3 and 6.----------------.4 11-20 78-13315-02 .-----.------.----.-------.-----------------------902 VLAN0007 active 38 4/4-6 VLAN Type SAID MTU Parent RingNo BrdgNo Stp BrdgMode Trans1 Trans2 ---.-----.-----.-------------------------------.-----.-----.--------.----.---------.

Conflict with Promiscuous port(s) : 5/2 Console> (enable) show pvlan capability 5/2 Ports 5/1 . Port 5/20 can be made a private vlan port. truncated output. Port 5/1 cannot be made a private vlan port due to: -----------------------------------------------------Trunking ports are not Private Vlan capable.. Console> (enable) show pvlan capability 5/1 Ports 5/1 .. Conflict with Trunking port(s) : 5/1 Catalyst 6000 Family Software Configuration Guide—Releases 6.---------. Console> (enable) Primary Secondary ------.5/12 are in the same ASIC range as port 5/1. This example shows the port capability for several ports in the following configuration: Console> Console> Console> Console> (enable) (enable) (enable) (enable) set set set set pvlan pvlan pvlan trunk 10 20 mapping 10 20 3/1 mapping 10 20 5/2 5/1 desirable isl 1-1005.903 half 100 100BaseFX MM 4/9 notconnect 7..5/12 are in the same ASIC range as port 5/2.5/24 are in the same ASIC range as port 5/20. Port 5/2 cannot be made a private vlan port due to: -----------------------------------------------------Promiscuous ports cannot be made private vlan ports..902 half 100 100BaseFX MM 4/7 notconnect 7.-----.-------.3 and 6.truncated output.. Viewing the Port Capability of a Private VLAN Port You can view the port capability of a port in a private VLAN using the show pvlan capability mod/port command.---------.--------10 20 show pvlan Secondary-Type Ports -------------..---------3/1 7 901-903 Console> (enable) show port Port Name Status Vlan Duplex Speed Type ----.-----------isolated Console> (enable) show pvlan capability 3/1 Port 3/1 cannot be made a private vlan port due to: -----------------------------------------------------Promiscuous ports cannot be made private vlan ports. 4/3 notconnect 7.902 half 100 100BaseFX MM 4/6 notconnect 7.902 half 100 100BaseFX MM 4/5 notconnect 7..Chapter 11 Configuring VLANs Configuring Private VLANs Console> (enable) show pvlan mapping Port Primary Secondary ----.-----------.903 half 100 100BaseFX MM ..1025-4094 Console> (enable) show pvlan capability 5/20 Ports 5/13 .----.903 half 100 100BaseFX MM 4/8 notconnect 7.901 half 100 100BaseFX MM 4/4 notconnect 7.-----------------.4 78-13315-02 11-21 .

Deleting a Private VLAN You can delete a private VLAN by deleting the primary VLAN. the binding with the primary VLAN is broken. or two-way community ports associated to the VLAN become inactive.5/12 are in the same ASIC range as port 5/3. or Two-Way Community VLAN If you delete an isolated. community. Command clear vlan primary_vlan This example shows how to delete primary VLAN 7: Console> (enable) clear vlan 7 This command will de-activate all ports on vlan 7 Do you want to continue(y/n) [n]?y Vlan 7 deleted Console> (enable) Deleting an Isolated. perform this task in privileged mode: Task Delete a primary VLAN. and any related mappings on the promiscuous port(s) are deleted.4 11-22 78-13315-02 . all ports in the private VLAN become inactive. If you delete a primary VLAN. To delete a private VLAN.Chapter 11 Configuring Private VLANs Configuring VLANs Console> (enable) show pvlan capability 5/3 Ports 5/1 . all bindings to the primary VLAN are broken. any isolated. or two-way community VLAN. perform this task in privileged mode: Task Delete an isolated or community VLAN.3 and 6. Community. and any related mappings on the promiscuous port(s) are deleted. Command clear vlan {isolated_vlan | community_vlan | twoway_community_vlan} This example shows how to delete the community VLAN 902: Console> (enable) clear vlan 902 This command will de-activate all ports on vlan 902 Do you want to continue(y/n) [n]?y Vlan 902 deleted Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. To delete a VLAN on the switch. community. Port 5/3 cannot be made a private vlan port due to: -----------------------------------------------------Conflict with Promiscuous port(s) : 5/2 Conflict with Trunking port(s) : 5/1 Console> (enable) show pvlan capability 15/1 Port 15/1 cannot be made a private vlan port due to: -----------------------------------------------------Only ethernet ports can be added to private vlans.

When a private VLAN port is set to inactive. The show pvlan command displays information about private VLANs only when the primary private VLAN is up. Secondary 101 • • • • • Enter an interface vlan command to configure Layer 3 parameters only for primary private VLANs. An error occurs during the configuration of a port to be a private VLAN port.4 78-13315-02 11-23 . Connecting new equipment with the same IP address generates a message and the ARP entry is not created. For security reasons. it displays “pvlan-” as its VLAN number in the show port output. private VLAN interface sticky ARP entries do not age out. perform this task in privileged mode: Task Command Delete the port mapping from the private VLAN. clear pvlan mapping primary_vlan {isolated | community | twoway-community} {mod/ports} This example shows how to delete the mapping of VLANs 902 to 901. If you delete all the mappings on a promiscuous port. the promiscuous port becomes inactive. Secondary 101 %PV-6-PV_MSG:Created a private vlan mapping. Primary 100. Because the private VLAN interface ARP entries do not age out. Entering a set pvlan mapping or a clear pvlan mapping command on the supervisor engine generates MSFC syslog messages. ARP entries learned on Layer 3 private VLAN interfaces are sticky ARP entries (we recommend that you display and verify private VLAN interface ARP entries). community. To delete a port mapping from a private VLAN.Chapter 11 Configuring VLANs Configuring Private VLANs Deleting a Private VLAN Mapping If you delete the private VLAN mapping.3 and 6. All mappings from a non-MSFC promiscuous port are deleted. A private VLAN port might be set to inactive for the following reasons: • • • The primary. isolated. On the supervisor engine. Primary 200. Primary 100. Catalyst 6000 Family Software Configuration Guide—Releases 6. the connectivity breaks between the isolated. community. See the following for an example: %PV-6-PV_MSG:Created a private vlan mapping. you cannot create isolated or community VLANs using VLAN numbers for which interface vlan commands have been entered on the MSFC. or two-way community ports and the promiscuous port. you must manually remove private VLAN interface ARP entries if a MAC address changes. Secondary 201 %PV-6-PV_MSG:Purged a private vlan mapping. or two-way community VLAN to which it belongs is cleared. previously set on ports 3/2 through 3/5: Console> (enable) clear pvlan mapping 901 902 3/2-5 Successfully cleared mapping between 901 and 902 on 3/2-5 Console> (enable) Private VLAN Support on the MSFC These items describe private VLAN support on the MSFC: • • Enter the show pvlan command to display information about private VLANs.

Chapter 11 Configuring FDDI VLANs

Configuring VLANs

You can add or remove private VLAN ARP entries manually as follows:
obelix-rp(config)# no arp 11.1.3.30 IP ARP:Deleting Sticky ARP entry 11.1.3.30 obelix-rp(config)# arp 11.1.3.30 0000.5403.2356 arpa IP ARP:Overwriting Sticky ARP entry 11.1.3.30, hw:00d0.bb09.266e by hw:0000.5403.2356

Some commands clear and recreate private VLAN mapping as follows:
obelix-rp(config)# xns routing obelix-rp(config)# %PV-6-PV_MSG:Purged a private vlan mapping, Primary 100, Secondary 101 %PV-6-PV_MSG:Purged a private vlan mapping, Primary 100, Secondary 102 %PV-6-PV_MSG:Purged a private vlan mapping, Primary 100, Secondary 103 %PV-6-PV_MSG:Created a private vlan mapping, Primary 100, Secondary 101 %PV-6-PV_MSG:Created a private vlan mapping, Primary 100, Secondary 102 %PV-6-PV_MSG:Created a private vlan mapping, Primary 100, Secondary 103

Configuring FDDI VLANs
To create a new FDDI VLAN, perform this task in privileged mode: Task
Step 1 Step 2

Command set vlan vlan [name name] type {fddi | fddinet} [said said] [mtu mtu] show vlan [vlan]

Create a new FDDI or FDDI NET-type VLAN. Verify the VLAN configuration.

To modify the VLAN parameters on an existing FDDI VLAN, perform this task in privileged mode: Task
Step 1 Step 2

Command set vlan vlan [name name] [state {active | suspend}] [said said] [mtu mtu] show vlan [vlan]

Modify an existing FDDI or FDDI NET-type VLAN. Verify the VLAN configuration.

Configuring Token Ring VLANs
These sections describe the two Token Ring VLAN types that are supported on switches running VTP version 2:
• • • • •

Understanding Token Ring TrBRF VLANs, page 11-xxv Understanding Token Ring TrCRF VLANs, page 11-xxv Token Ring VLAN Configuration Guidelines, page 11-xxvii Creating or Modifying a Token Ring TrBRF VLAN, page 11-xxvii Creating or Modifying a Token Ring TrCRF VLAN, page 11-xxviii

You must use VTP version 2 to configure and manage Token Ring VLANs.

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Configuring VLANs Configuring Token Ring VLANs

Note

Catalyst 6000 family switches do not support ISL-encapsulated Token Ring frames.

Understanding Token Ring TrBRF VLANs
Token Ring Bridge Relay Function (TrBRF) VLANs interconnect multiple Token Ring Concentrator Relay Function (TrCRF) VLANs in a switched Token Ring network (see Figure 2). The TrBRF can be extended across a network of switches interconnected through trunk links. The connection between the TrCRF and the TrBRF is referred to as a logical port.
Figure 11-2 Interconnected Token Ring TrBRF and TrCRF VLANs
SRB or SRT BRF

CRF SRS SRS SRS

Token Ring 001

Token Ring 001

Token Ring 011

Token Ring 002

Token Ring 002

Token Ring 002

For source routing, the switch appears as a single bridge between the logical rings. The TrBRF can function as a source-route bridge (SRB) or as a source-route transparent (SRT) bridge running either the IBM or IEEE STP. If SRB is used, you can define duplicate MAC addresses on different logical rings. The Token Ring software runs an instance of STP for each TrBRF VLAN and each TrCRF VLAN. For TrCRF VLANs, STP removes loops in the logical ring. For TrBRF VLANs, STP interacts with external bridges to remove loops from the bridge topology, similar to STP operation on Ethernet VLANs.

Caution

Certain parent TrBRF STP and TrCRF bridge mode configurations can place the logical ports (the connection between the TrBRF and the TrCRF) of the TrBRF in a blocked state. For more information, see the “Default VLAN Configuration” section on page 11-iv. For source routing, the switch appears as a single bridge between the logical rings. The TrBRF can function as an SRB or SRT bridge running either the IBM or IEEE STP. If SRB is used, duplicate MAC addresses can be defined on different logical rings. To accommodate IBM System Network Architecture (SNA) traffic, you can use a combination of SRT and SRB modes. In a mixed mode, the TrBRF considers some ports (logical ports connected to TrCRFs) to operate in SRB mode while others operate in SRT mode.

Understanding Token Ring TrCRF VLANs
Token Ring Concentrator Relay Function (TrCRF) VLANs define port groups with the same logical ring number. You can configure two types of TrCRFs in your network: undistributed and backup.

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Configuring VLANs

Typically, TrCRFs are undistributed, which means each TrCRF is limited to the ports on a single switch. Multiple undistributed TrCRFs on the same or separate switches can be associated with a single parent TrBRF (see Figure 3). The parent TrBRF acts as a multiport bridge, forwarding traffic between the undistributed TrCRFs.

Note

To pass data between rings located on separate switches, you can associate the rings to the same TrBRF and configure the TrBRF for SRB.
Figure 11-3 Undistributed TrCRFs
Switch A ISL Switch B

TrBRF 3
S6813 S6812

TrCRF 400

TrCRF 350

TrCRF 200

Note

By default, Token Ring ports are associated with the default TrCRF (VLAN 1003, trcrf-default), which has the default TrBRF (VLAN 1005, trbrf-default) as its parent. In this configuration, a distributed TrCRF is possible (see Figure 4), and traffic is passed between the default TrCRFs located on separate switches provided that the switches are connected through an ISL trunk.
Figure 11-4 Distributed TrCRF
Switch A ISL Switch B

TrBRF 2 TrCRF 300 TrCRF 300 TrCRF 300

Within a TrCRF, source-route switching forwards frames based on either MAC addresses or route descriptors. The entire VLAN can operate as a single ring, with frames switched between ports within a single TrCRF. You can specify the maximum hop count for All-Routes and Spanning Tree Explorer frames for each TrCRF. This limits the maximum number of hops an explorer is allowed to traverse. If a port determines that the explorer frame it is receiving has traversed more than the number of hops specified, it does not forward the frame. The TrCRF determines the number of hops an explorer has traversed based on the number of bridge hops in the route information field. A backup TrCRF enables you to configure an alternate route for traffic between undistributed TrCRFs located on separate switches that are connected by a TrBRF, in the event that the ISL connection between the switches fails. Only one backup TrCRF for a TrBRF is allowed, and only one port per switch can belong to a backup TrCRF.

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Configuring VLANs Configuring Token Ring VLANs

If the ISL connection between the switches fails, the port in the backup TrCRF on each affected switch automatically becomes active, rerouting traffic between the undistributed TrCRFs through the backup TrCRF. When the ISL connection is reestablished, all but one port in the backup TrCRF is disabled. Figure 5 illustrates the backup TrCRF.
Figure 11-5 Backup TrCRF
Switch A ISL Switch B

TrBRF 1 TrCRF 600 Backup TrCRF 612 TrCRF 601

Token Ring VLAN Configuration Guidelines
When you create or modify Token Ring VLANs, take the following guidelines into consideration:

For Token Ring VLANs, the default TrBRF (VLAN 1005) can only be the parent of the default TrCRF (VLAN 1003). You cannot specify the default TrBRF as the parent of a user-configured TrCRF. You must configure a TrBRF before you configure the TrCRF; that is, the parent TrBRF VLAN you specify for the TrCRF must already exist. In a Token Ring environment, the logical ports of the TrBRF (the connection between the TrBRF and the TrCRF) are placed in a blocked state if either of these conditions exists:
– The TrBRF is running the IBM STP, and the TrCRF is in SRT mode. – The TrBRF is running the IEEE STP, and the TrCRF is in SRB mode.

• •

Creating or Modifying a Token Ring TrBRF VLAN
You must enable VTP version 2 before you create Token Ring VLANs. For information on enabling VTP version 2, see Chapter 10, “Configuring VTP.” You must specify a bridge number when you create a new TrBRF. To create a new Token Ring TrBRF VLAN, perform this task in privileged mode: Task
Step 1 Step 2

Command set vlan vlan [name name] type trbrf [said said] [mtu mtu] bridge bridgeber [stp {ieee | ibm}] show vlan [vlan]

Create a new Token Ring TrBRF-type VLAN. Verify the VLAN configuration.

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Configuring VLANs

This example shows how to create a new Token Ring TrBRF VLAN and verify the configuration:
Console> (enable) set vlan 999 name TrBRF_999 type trbrf bridge a Vlan 999 configuration successful Console> (enable) show vlan 999 VLAN Name Status IfIndex Mod/Ports, Vlans ---- -------------------------------- --------- ------- -----------------------999 TrBRF_999 active VLAN Type SAID MTU Parent RingNo BrdgNo Stp BrdgMode Trans1 Trans2 ---- ----- ---------- ----- ------ ------ ------ ---- -------- ------ -----999 trbrf 100999 4472 0xa ibm 0 0 VLAN AREHops STEHops Backup CRF ---- ------- ------- ---------Console> (enable)

To modify the VLAN parameters on an existing Token Ring TrBRF VLAN, perform this task in privileged mode: Task
Step 1

Command

Modify an existing Token Ring TrBRF-type set vlan vlan [name name] [state {active | suspend}] VLAN. [said said] [mtu mtu] [bridge bridgeber] [stp {ieee | ibm}] Verify the VLAN configuration. show vlan [vlan]

Step 2

Creating or Modifying a Token Ring TrCRF VLAN
Note

You must enable VTP version 2 before you create Token Ring VLANs. For information on enabling VTP version 2, see Chapter 10, “Configuring VTP.” To create a new Token Ring TrCRF VLAN, perform this task in privileged mode: Task Command set vlan vlan [name name] type trcrf [said said] [mtu mtu] {ring hex_ringber | decring decimal_ringber} parent vlan show vlan [vlan]

Step 1

Create a new Token Ring TrCRF-type VLAN.

Step 2

Verify the VLAN configuration.

Note

You must specify a ring number (either in hexadecimal or in decimal) and a parent TrBRF VLAN when creating a new TrCRF.

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Configuring VLANs Configuring Token Ring VLANs

This example shows how to create a Token Ring TrCRF VLAN and verify the configuration:
Console> (enable) set vlan 998 name TrCRF_998 type trcrf decring 10 parent 999 Vlan 998 configuration successful Console> (enable) show vlan 998 VLAN Name Status IfIndex Mod/Ports, Vlans ---- -------------------------------- --------- ------- -----------------------998 TrCRF_998 active 352 VLAN Type SAID MTU Parent RingNo BrdgNo Stp BrdgMode Trans1 Trans2 ---- ----- ---------- ----- ------ ------ ------ ---- -------- ------ -----998 trcrf 100998 4472 999 0xa srb 0 0 VLAN AREHops STEHops Backup CRF ---- ------- ------- ---------998 7 7 off Console> (enable)

To modify the VLAN parameters on an existing Token Ring TrCRF VLAN, perform this task in privileged mode: Task
Step 1

Command set vlan vlan [name name] [state {active | suspend}] [said said] [mtu mtu] [ring hex_ring] [decring decimal_ring] [bridge bridge] [parent vlan] show vlan [vlan]

Modify an existing Token Ring TrCRF VLAN. Verify the VLAN configuration.

Step 2

To create a backup TrCRF, assign one port on each switch that the TrBRF traverses to the backup TrCRF. To configure a TrCRF VLAN as a backup TrCRF, perform this task in privileged mode: Task
Step 1 Step 2

Command set vlan vlan backupcrf on show vlan [vlan]

Configure a TrCRF VLAN as a backup TrCRF. Verify the VLAN configuration.

Caution

If the backup TrCRF port is attached to a Token Ring multistation access unit (MSAU), it does not provide a backup path unless the ring speed and port mode are set by another device. We recommend that you configure the ring speed and port mode for the backup TrCRF. To specify the maximum number of hops for All-Routes Explorer frames or Spanning Tree Explorer frames in the TrCRF, perform this task in privileged mode: Task Command set vlan vlan aremaxhop hopcount set vlan vlan stemaxhop hopcount show vlan [vlan]

Step 1 Step 2 Step 3

Specify the maximum number of hops for All-Routes Explorer frames in the TrCRF. Specify the maximum number of hops for Spanning Tree Explorer frames in the TrCRF. Verify the VLAN configuration.

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Configuring VLANs

This example shows how to limit All-Routes Explorer frames and Spanning Tree Explorer frames to ten hops and how to verify the configuration:
Console> (enable) set vlan 998 aremaxhop 10 stemaxhop 10 Vlan 998 configuration successful Console> (enable) show vlan 998 VLAN Name Status IfIndex Mod/Ports, Vlans ---- -------------------------------- --------- ------- -----------------------998 VLAN0998 active 357

VLAN Type SAID MTU Parent RingNo BrdgNo Stp BrdgMode Trans1 Trans2 ---- ----- ---------- ----- ------ ------ ------ ---- -------- ------ -----998 trcrf 100998 4472 999 0xff srb 0 0

VLAN AREHops STEHops Backup CRF ---- ------- ------- ---------998 10 10 off Console> (enable)

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Configuring InterVLAN Routing
This chapter describes how to configure the Multilayer Switch Feature Card (MSFC) for interVLAN routing on the Catalyst 6000 family switches.

Note

For complete syntax and usage for the commands used in this chapter, refer to the Catalyst 6000 Family Command Reference publication. This chapter consists of these sections:
• •

Understanding How InterVLAN Routing Works, page 12-i Configuring InterVLAN Routing on the MSFC, page 12-ii

Note

Refer to the FlexWAN Module Port Adapter Installation and Configuration Notes for information about configuring routing on FlexWAN module interfaces.

Understanding How InterVLAN Routing Works
Network devices in different VLANs cannot communicate with one another without a router to forward traffic between the VLANs. In most network environments, VLANs are associated with individual networks or subnetworks. For example, in an IP network, each subnetwork is mapped to an individual VLAN. In an IPX network, each VLAN is mapped to an IPX network number. Configuring VLANs helps control the size of the broadcast domain and keeps local traffic local. When an end station in one VLAN needs to communicate with an end station in another VLAN, interVLAN communication is required. This communication is provided by interVLAN routing. You configure one or more routers to route traffic to the appropriate destination VLAN. Figure 1 shows a basic interVLAN routing topology. Switch A is in VLAN 10 and Switch B is in VLAN 20. The router has an interface in each VLAN.

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Configuring InterVLAN Routing

Figure 12-1 Basic InterVLAN Routing Topology

VLAN 10 Switch A

VLAN 20 Switch B C Host ISL Trunks
18071

A Host B Host

When Host A in VLAN 10 needs to communicate with Host B in VLAN 10, it sends a packet addressed to that host. Switch A forwards the packet directly to Host B, without sending it to the router. When Host A sends a packet to Host C in VLAN 20, Switch A forwards the packet to the router, which receives the traffic on the VLAN 10 interface. The router checks the routing table, determines the correct outgoing interface, and forwards the packet out the VLAN 20 interface to Switch B. Switch B receives the packet and forwards it to Host C.

Configuring InterVLAN Routing on the MSFC
Note

This section is for users who are familiar with Cisco IOS software and have some experience configuring Cisco IOS routing. If you are not familiar with configuring Cisco routing, refer to the Cisco IOS documentation on Cisco.com. These sections describe how to configure interVLAN routing on the MSFC:
• • • • •

MSFC Routing Configuration Guidelines, page 12-ii Configuring IP InterVLAN Routing on the MSFC, page 12-iii Configuring IPX InterVLAN Routing on the MSFC, page 12-iii Configuring AppleTalk InterVLAN Routing on the MSFC, page 12-iv Configuring MSFC Features, page 12-iv

MSFC Routing Configuration Guidelines
Configuring interVLAN routing on the MSFC consists of two main procedures:
1. 2.

Create and configure VLANs on the switch and assign VLAN membership to switch ports. For more information, see Chapter 11, “Configuring VLANs.” Create and configure VLAN interfaces for interVLAN routing on the MSFC. Configure a VLAN interface for each VLAN for which you want to route traffic.

VLAN interfaces on the MSFC are virtual interfaces. However, you configure them much as you do a physical router interface. MSFC2 and MSFC support the same range of VLANs as the supervisor engine. MSFC2 supports up to 1,000 VLAN interfaces. MSFC supports up to 256 VLAN interfaces.

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Configuring InterVLAN Routing Configuring InterVLAN Routing on the MSFC

Configuring IP InterVLAN Routing on the MSFC
To configure interVLAN routing for IP, perform this task: Task
Step 1 Step 2 Step 3 Step 4 Step 5

Command Router(config)# ip routing Router(config)# router ip_routing_protocol Router(config)# interface vlan-id Router(config-if)# ip address n.n.n.n mask Router(config-if)# Ctrl-Z

(Optional) Enable IP routing on the router1. (Optional) Specify an IP routing protocol2. Specify a VLAN interface on the MSFC. Assign an IP address to the VLAN. Exit configuration mode.
1. 2.

This step is necessary if you have multiple routers in the network. This step is necessary if you enabled IP routing in Step 1. This step might include other commands, such as using the network router configuration command to specify the networks to route. Refer to the documentation for your router platform for detailed information on configuring routing protocols.

This example shows how to enable IP routing on the MSFC, create a VLAN interface, and assign the interface an IP address:
Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)# ip routing Router(config)# router rip Router(config-router)# network 10.0.0.0 Router(config-router)# interface vlan 100 Router(config-if)# ip address 10.1.1.1 255.0.0.0 Router(config-if)# ^Z Router#

Configuring IPX InterVLAN Routing on the MSFC
To configure interVLAN routing for Internetwork Packet Exchange (IPX), perform this task: Task
Step 1 Step 2 Step 3 Step 4 Step 5
1

Command Router(config)# ipx router ipx_routing_protocol Router(config)# interface vlan-id Router(config-if)# ipx network [network | unnumbered] encapsulation encapsulation-type Router(config-if)# Ctrl-Z

(Optional) Enable IPX routing on the router . Router(config)# ipx routing (Optional) Specify an IPX routing protocol2. Specify a VLAN interface on the MSFC. Assign a network number to the VLAN . Exit configuration mode.
1. 2.
3

This step is necessary if you have multiple routers in the network. This step is necessary if you enabled IPX routing in Step 1. This step might include other commands, such as using the network router configuration command to specify the networks to route. Refer to the documentation for your router platform for detailed information on configuring routing protocols. This step enables IPX routing on the VLAN. When you enable IPX routing on the VLAN, you can also specify an encapsulation type.

3.

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Configuring InterVLAN Routing

This example shows how to enable IPX routing on the MSFC, create a VLAN interface, and assign the interface an IPX network address:
Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)# ipx routing Router(config)# ipx router rip Router(config-ipx-router)# network all Router(config-ipx-router)# interface vlan100 Router(config-if)# ipx network 100 encapsulation snap Router(config-if)# ^Z Router#

Configuring AppleTalk InterVLAN Routing on the MSFC
To configure interVLAN routing for AppleTalk, perform this task: Task
Step 1 Step 2 Step 3 Step 4 Step 5

Command Router(config)# appletalk routing

(Optional) Enable AppleTalk routing on the router1. Assign a cable range to the VLAN. Assign a zone name to the VLAN. Exit configuration mode.
1.

Specify a VLAN interface on the MSFC. Router(config)# interface vlan-id Router(config-if)# appletalk cable-range cable-range Router(config-if)# appletalk zone zone-name Router(config-if)# Ctrl-Z

This step is necessary if you have multiple routers in the network.

This example shows how to enable AppleTalk routing on the MSFC, create a VLAN interface, and assign the interface an AppleTalk cable-range and zone name:
Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)# appletalk routing Router(config)# interface vlan100 Router(config-if)# appletalk cable-range 100-100 Router(config-if)# appletalk zone Engineering Router(config-if)# ^Z Router#

Configuring MSFC Features
These sections describe features implemented on the MSFC:
• • •

Local Proxy ARP, page 12-v WCCP Layer 2 Redirection, page 12-v Auto State Feature, page 12-v

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Local Proxy ARP
With Release 12.1(2)E or later releases, the Local Proxy Address Resolution Protocol (ARP) allows the MSFC to respond to ARP requests for IP addresses within a subnet where normally no routing is required. With local proxy ARP enabled, the MSFC responds to all ARP requests for IP addresses within the subnet and forwards all traffic between hosts in the subnet. Use this feature only on subnets where hosts are intentionally prevented from communicating directly by the configuration on the switch to which they are connected. Local proxy ARP is disabled by default. Enter the ip local-proxy-arp interface configuration command to enable local proxy ARP on an interface. Enter the no ip local-proxy-arp interface configuration command to disable the feature. The Internet Control Message Protocol (ICMP) redirects are disabled on interfaces where local proxy ARP is enabled.

WCCP Layer 2 Redirection
Note

Supervisor Engine 1 with the Policy Feature Card (PFC) supports this feature with Release 12.1(2)E or later releases. Supervisor Engine 2 with PFC2 supports this feature with Release 12.1(3a)E or later releases. Web Cache Communication Protocol (WCCP) Layer 2 redirection allows directly connected Cisco Cache Engines to use Layer 2 redirection, which is more efficient than Layer 3 redirection, through generic routing encapsulation (GRE). You can configure a directly connected Cache Engine to negotiate use of WCCP Layer 2 redirection. WCCP Layer 2 redirection requires no configuration on the MSFC. Enter the show ip wccp web-cache detail command to display which redirection method is in use for each cache. Follow these guidelines when using this feature:
• • •

WCCP Layer 2 redirection feature sets the IP flow mask to full-flow mode. You can configure the Cisco Cache Engine software release 2.2 or later releases to use WCCP Layer 2 redirection. Layer 2 redirection takes place on the switch and is not visible to the MSFC. Entering the show ip wccp web-cache detail command on the MSFC displays statistics for only the first packet of a Layer 2 redirected flow, which provides an indication of how many flows, rather than packets, are using Layer 2 redirection. Entering the show mls entries command on the supervisor engine displays the other packets in the Layer 2 redirected flows.

Configure the Cisco IOS WCCP as described in the Cisco IOS Configuration Fundamentals Configuration Guide at http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/fun_c/fcprt3/fcd305.htm

Auto State Feature
The auto state feature shuts down (or brings up) Layer 3 interfaces/subinterfaces on the MSFC and the Multilayer Switch Module (MSM) when the following port configuration changes occur on the switch:

When the last external port on a VLAN goes down, all Layer 3 interfaces/subinterfaces on that VLAN shut down (are autostated) unless sc0 is on the VLAN or another router is in the chassis with an interface/subinterface in the VLAN. When a Layer 3 interface goes down, this message is reported to the console for each Layer 3 interface:
%AUTOSTATE-6-SHUT_DOWN

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When the first external port on the VLAN is brought back up, all Layer 3 interfaces on that VLAN that were previously shut down are brought up. This message is reported to the console for each Layer 3 interface:
%AUTOSTATE-6-BRING_UP

The Catalyst 6000 family switch does not have knowledge of, or control over, the MSM or MSFC configuration (just as the switch does not have knowledge of, or control over, external router configurations). The auto state feature will not work on MSM or MSFC interfaces if the MSM or MSFC is not properly configured. For example, consider this MSM trunk configuration:
interface GigabitEthernet0/0/0.200 encap isl 200 . .

In the example, the GigabitEthernet0/0/0.200 interface is not auto stated if any of these configuration errors are made:
• • •

VLAN 200 is not configured on the switch. Trunking is not configured on the corresponding Gigabit Ethernet switch port. Trunking is configured but VLAN 200 is not an allowed VLAN on that trunk.

Displaying the Auto State Configuration
To display the current line protocol state determination for the MSM, perform this task in normal mode: Task Display the current line protocol state determination for the MSM. Command show msmautostate mod

This example shows how to display the current line protocol state determination for the MSM:
Console> show msmautostate MSM Auto port state: enabled Console>

To display the line protocol state determination for the MSFC, perform this task in privileged mode: Task Display the line protocol state determination for the MSFC. Command show msfcautostate

This example shows how to display the line protocol state determination for the MSFC:
Console> (enable) show msfcautostate MSFC Auto port state: enabled Console> (enable)

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To check which MSM interfaces are currently auto stated, perform this task in enabled mode: Task Check which MSM interfaces are currently auto stated. Command show autostate entries

This example shows how to check which MSM interfaces are currently auto stated (shutdown or brought up through auto state):
Router# show autostate entries Port-channel1.5 Port-channel1.6 Port-channel1.4 Router#

Disabling the Auto State Feature
To disable the auto state feature if you have an MSM installed, perform this task in privileged mode: Task Command

Disable the auto state feature if you have an MSM set msmautostate disable installed. The auto state feature is enabled by default. This example shows how to disable the auto state feature if you have an MSM installed:
Console> (enable) set msmautostate disable MSM port auto state disabled. Console> (enable)

To disable the line protocol state determination of the MSFC, perform this task in privileged mode:

Note

If you toggle (enable to disable and/or disable to enable) the msfcautostate command you might have to use the shutdown and no shutdown commands to disable and then restart the VLAN and WAN interfaces on the MSFC to bring them back up. Unless there is a valid reason, the MSFC auto state feature should not be disabled.

Task Disable the line protocol state determination of the MSFC.

Command set msfcautostate disable

This example shows how to disable the line protocol state determination of the MSFC:
Console> (enable) set msfcautostate disable MSM port auto state disabled. Console> (enable)

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Configuring InterVLAN Routing

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Configuring CEF for PFC2
This chapter describes how to configure Cisco Express Forwarding (CEF) for Policy Feature Card 2 (PFC2). CEF for PFC2 provides IP and Internetwork Packet Exchange (IPX) unicast Layer 3 switching and IP multicast Layer 3 switching for Supervisor Engine 2, PFC2, and Multilayer Switch Feature Card 2 (MSFC2).

Note

For complete information on the syntax and usage information for the supervisor engine commands used in this chapter, refer to the Catalyst 6000 Family Command Reference publication. This chapter consists of these sections:
• • • • •

Understanding How Layer 3 Switching Works, page 13-i Default CEF for PFC2 Configuration, page 13-x CEF for PFC2 Configuration Guidelines and Restrictions, page 13-xi Configuring CEF for PFC2, page 13-xii Configuring NetFlow Statistics, page 13-xxii

Note

Supervisor Engine 1 with the PFC1 and the MSFC or MSFC2 provide Layer 3 switching with Multilayer Switching (MLS). See Chapter 14, “Configuring MLS,” for more information.

Note

To configure the MSFC2 to support MLS on a Catalyst 5000 family switch, refer to the Layer 3 Switching Software Configuration Guide at http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/rel_5_2/layer3/index.htm.

Understanding How Layer 3 Switching Works
These sections describe Layer 3 switching with PFC2:
• • • •

Layer 3 Switching Overview, page 13-ii Understanding Layer 3-Switched Packet Rewrite, page 13-ii Understanding CEF for PFC2, page 13-iv Understanding NetFlow Statistics, page 13-ix

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Configuring CEF for PFC2

Layer 3 Switching Overview
Layer 3 switching allows the switch, instead of a router, to forward IP and IPX unicast traffic and IP multicast traffic between VLANs. Layer 3 switching is implemented in hardware and provides wire-speed interVLAN forwarding on the switch, rather than on the MSFC2. Layer 3 switching requires minimal support from the MSFC2. The MSFC2 routes any traffic that cannot be Layer 3 switched.

Note

Layer 3 switching supports the routing protocols configured on the MSFC2. Layer 3 switching does not replace the routing protocols configured on the MSFC2. Layer 3 switching uses Protocol Independent Multicast (PIM) for multicast route determination. Layer 3 switching on Catalyst 6000 family switches provides flow statistics that you can use to identify traffic characteristics for administration, planning, and troubleshooting. Layer 3 switching uses NetFlow Data Export (NDE) to export flow statistics (for more information about NDE, see Chapter 15, “Configuring NDE”).

Note

Traffic is Layer 3 switched after being processed by the VLAN access control list (VACL) feature and the quality of service (QoS) feature.

Understanding Layer 3-Switched Packet Rewrite
When a packet is Layer 3 switched from a source in one VLAN to a destination in another VLAN, the switch performs a packet rewrite at the egress port based on information learned from the MSFC2 so that the packets appear to have been routed by the MSFC2.

Note

Rather than just forwarding IP multicast packets, the PFC2 replicates them as necessary on the appropriate VLANs. Packet rewrite alters five fields:
• • • • •

Layer 2 (MAC) destination address Layer 2 (MAC) source address Layer 3 IP Time to Live (TTL) or IPX Transport Control Layer 3 checksum Layer 2 (MAC) checksum (also called the frame checksum or FCS)

Note

Packets are rewritten with the encapsulation appropriate for the next-hop subnet. If Source A and Destination B are on different VLANs and Source A sends a packet to the MSFC2 to be routed to Destination B, the switch recognizes that the packet was sent to the Layer 2 (MAC) address of the MSFC2. To perform Layer 3 switching, the switch rewrites the Layer 2 frame header, changing the Layer 2 destination address to the Layer 2 address of Destination B and the Layer 2 source address to the Layer 2 address of the MSFC2. The Layer 3 addresses remain the same.

Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4

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These sections describe how the packets are rewritten: • • • Understanding IP Unicast Rewrite.3 and 6. the switch decrements the Layer 3 TTL value by 1 and recomputes the Layer 3 packet checksum. it is (conceptually) formatted as follows: Layer 2 Frame Header Destination Source Destination B MAC MSFC2 MAC Layer 3 IP Header Destination Source TTL Checksum calculation2 Destination B IP Source A IP n-1 Data FCS Understanding IPX Unicast Rewrite Received IPX packets are (conceptually) formatted as follows: Layer 2 Frame Header Destination Source Layer 3 IPX Header Checksum/ IPX Length/ Transport Control n Destination Net/ Node/ Socket Destination B IPX Source Net/ Node/ Socket Source A IPX Data FCS MSFC2 MAC Source A MAC After the switch rewrites an IPX packet.4 78-13315-02 13-3 . In IPX traffic. replicates as necessary) the rewritten packet to Destination B’s VLAN. page 13-iv Understanding IP Unicast Rewrite Received IP unicast packets are (conceptually) formatted as follows: Layer 2 Frame Header Destination Source MSFC2 MAC Source A MAC Layer 3 IP Header Destination Destination B IP Source Source A IP TTL n Checksum calculation1 Data FCS After the switch rewrites an IP unicast packet. The switch recomputes the Layer 2 frame checksum and forwards (or for multicast packets. page 13-iii Understanding IPX Unicast Rewrite. page 13-iii Understanding IP Multicast Rewrite. the switch increments the Layer 3 Transport Control value by 1 and recomputes the Layer 3 packet checksum. it is (conceptually) formatted as follows: Layer 2 Frame Header Destination Source Layer 3 IPX Header Checksum/ IPX Length/ Transport Control n+1 Destination Net/ Node/ Socket Destination B IPX Source Net/ Node/ Socket Source A IPX Data FCS Destination B MSFC2 MAC MAC Catalyst 6000 Family Software Configuration Guide—Releases 6.Chapter 13 Configuring CEF for PFC2 Understanding How Layer 3 Switching Works In IP unicast and IP multicast traffic.

page 13-vi Partially and Completely Switched Multicast Flows. CEF for PFC2 works with CEF (for unicast traffic) and PIM (for multicast traffic) on the MSFC2 to support IP. After the switch rewrites an IP multicast packet. CEF for PFC2 generates flow statistics for Layer 3-switched traffic that can be displayed at the CLI or used for NDE. In this example. Destination B is a member of Group G1.3 and 6. and IPX traffic. PFC2. Catalyst 6000 Family Software Configuration Guide—Releases 6. page 13-v Understanding the Adjacency Table. page 13-vii CEF for PFC2 Examples. CEF for PFC2 sends all packets that match an incomplete FIB entry (one where the MAC address has not been resolved) to the MSFC2 to be routed until the MSFC2 resolves the MAC address.Chapter 13 Understanding How Layer 3 Switching Works Configuring CEF for PFC2 Understanding IP Multicast Rewrite Received IP multicast packets are (conceptually) formatted as follows: Layer 2 Frame Header Destination Group G1 MAC 1 Layer 3 IP Header Source Source A MAC Destination Group G1 IP Source Source A IP TTL n Checksum calculation1 Data FCS 1. page 13-v Understanding the FIB. CEF for PFC2 is permanently enabled on Supervisor Engine 2. CEF and PIM on the MSFC2 are enhanced to support CEF for PFC2. it is (conceptually) formatted as follows: Frame Header Destination Group G1 MAC Source MSFC2 MAC IP Header Destination Group G1 IP Source Source A IP TTL n–1 Checksum calculation2 Data FCS Understanding CEF for PFC2 These sections describe CEF for PFC2: • • • • • • CEF for PFC2 Overview. IP multicast. page 13-vii CEF for PFC2 Overview Supervisor Engine 2.4 13-4 78-13315-02 . Note CEF for PFC2 sends bridge traffic that is addressed at Layer 2 to the MSFC2 to be processed. page 13-iv Understanding Forwarding Decisions. CEF for PFC2 provides Layer 3 switching for all packets that match a complete forwarding information base (FIB) entry (see the “Understanding the FIB” section on page 13-v). Cisco IOS CEF is permanently enabled on the MSFC2 in support of CEF for PFC2. and MSFC2 provide Layer 3 switching with CEF for PFC2.

The FIB maintains next-hop address information based on the information in the routing tables on the MSFC2. Understanding the FIB The FIB resides in a separate TCAM. The FIB supports 256K entries. CEF for PFC2 makes a forwarding decision for each packet and sends the rewrite information for each packet to the egress port.Chapter 13 Configuring CEF for PFC2 Understanding How Layer 3 Switching Works Note Access control lists (ACLs) and policy-based routing can cause CEF for PFC2 to ignore the FIB when making a forwarding decision (see the “Understanding Forwarding Decisions” section on page 13-v). the adjacency table. the unicast and multicast routing tables on the MSFC2 are updated and those changes are reflected in the FIB.4 78-13315-02 13-5 . It maintains a mirror image of the forwarding information contained in the unicast and multicast routing tables on the MSFC2. The adjacency table is stored separately in DRAM. FIB lookup uses the following criteria: • • • • Destination IP address for IP unicast Destination IPX network for IPX unicast Source and destination IP address for IP unicast with RPF check Source and destination IP address for IP multicast with RPF check Catalyst 6000 Family Software Configuration Guide—Releases 6. Enter the show mls cef command to display a Layer 3 switching summary: Console> (enable) show mls cef Total L3 packets switched: Total L3 octets switched: Total route entries: IP route entries: IPX route entries: IPM route entries: IP load sharing entries: IPX load sharing entries: Forwarding entries: Bridge entries: Drop entries: 0 0 18 15 3 0 0 0 4 12 2 Understanding Forwarding Decisions CEF for PFC2 provides Layer 3 switching based on: • • • Entries in the ACL ternary content addressable memory (TCAM) for policy-based routing decisions Entries in the NetFlow table for TCP intercept and reflexive ACL forwarding decisions (see the “Understanding NetFlow Statistics” section on page 13-ix) Entries in the FIB and adjacency table for all other forwarding decisions Enter the show mls entry command to display information about the entries used to make forwarding decisions. which includes 16K IP multicast entries. The FIB is conceptually similar to a routing table. and the NetFlow table do not compete with any other features for storage space. With reverse path forwarding (RPF) check enabled.3 and 6. where the rewrite occurs when the packet is transmitted from the switch. The NetFlow table is stored separately in DRAM. The FIB. the number of IP entries doubles. When routing or topology changes occur in the network.

resolved. To forward traffic. Table 13-1 Adjacency Types Adjacency Type connect punt no r/w frc drp drop. CEF for PFC2 stores Layer 2 information from the designated MSFC2 for adjacent nodes in the adjacency table. Enter the show mls entry cef command to display: • • • • • • • Module number of the MSFC that is supporting the FIB FIB entry type (receive. CEF for PFC2 supports 256K adjacency table entries. frc drp. connected. which points to an adjacency entry. any commands on the MSFC2 that change the unicast or multicast routing tables affect the FIB. null. In switches with redundant supervisor engines and MSFC2s.4 13-6 78-13315-02 .Chapter 13 Understanding How Layer 3 Switching Works Configuring CEF for PFC2 Note Because the FIB mirrors the unicast and multicast routing tables on the MSFC2. and uses the Layer 2 header for the adjacent node in the adjacency table entry to rewrite the packet during Layer 3 switching. The routing protocols on the nondesignated MSFC2 send information to the routing protocols on the designated MSFC2. Forwarding entries cannot be cleared from the Supervisor Engine 2 command-line interface (CLI). drop. the designated MSFC2 supports the FIB on the active Supervisor Engine 2.3 and 6. wildcard. Adjacent nodes are nodes that are directly connected at Layer 2. Table 1 lists the adjacency types. no r/w) Next-hop MAC address Next-hop VLAN Next-hop encapsulation Number of packets transmitted to this adjacency from the associated FIB entry Number of bytes transmitted to this adjacency from the associated FIB entry Catalyst 6000 Family Software Configuration Guide—Releases 6. or default) Destination address (IP address or IPX network) Destination mask Next-hop address (IP address or IPX network) Next-hop mask Next-hop load-sharing weight Understanding the Adjacency Table For each FIB entry. punt. loopbk Description Entry type that contains complete rewrite information Entry to send traffic to the MSFC2 Entry to send traffic to the MSFC2 when rewrite information is incomplete Entry used to drop packets due to ARP throttling Entries used to drop packets Enter the show mls entry cef adjacency command to display: • • • • • • • FIB information (see the “Understanding the FIB” section on page 13-v) Adjacency type (connect. loopbk. CEF for PFC2 selects a route from a FIB entry. null. drop.

and Host C is on the Engineering VLAN (IP subnet 171. For all completely Layer 3-switched flows.59. When Host A initiates an HTTP file transfer to Host C. Host B is on the Marketing VLAN (IP subnet 171. or IP protocol (an example is the Layer 4 port numbers). The multicast TTL threshold is configured on an egress interface for the flow. The MSFC uses the statistics to update the corresponding multicast routing table entries and reset the appropriate expiration timers.2. Network address translation (NAT) is configured on an interface. because it is switched by the PFC). Catalyst 6000 Family Software Configuration Guide—Releases 6. The show ip mroute and show mls ip multicast commands identify completely Layer 3-switched flows with the text string RPF-MFD (Multicast Fast Drop [MFD] indicates that from the viewpoint of the MSFC. because the MSFC cannot record multicast statistics for completely switched flows.1. CEF for PFC2 Examples Figure 1 shows a simple IP CEF network topology.3. the MSFC must send PIM-register messages to the rendezvous point).0).0). In this example. Note CEF for PFC2 provides Layer 3 switching when the extended access list deny condition on the RPF interface specifies something other than the Layer 3 source.Chapter 13 Configuring CEF for PFC2 Understanding How Layer 3 Switching Works Partially and Completely Switched Multicast Flows Some flows might be partially Layer 3 switched instead of completely Layer 3 switched in these situations: • • • • • • The MSFC is configured as a member of the IP multicast group (using the ip igmp join-group command) on the RPF interface of the multicast source. For partially switched flows. the PFC2 uses the information in the FIB and adjacency table to forward packets from Host A to Host C.59.4 78-13315-02 13-7 . and multicast to broadcast translation is required. The multicast helper is configured on the RPF interface for the flow. Multicast tag switching is configured on an egress interface. which it never sees. and source address translation is required for the outgoing interface. Note All (*. all multicast traffic belonging to the flow reaches the MSFC and is software switched for any interface that is not Layer 3 switched.3 and 6. Host A is on the Sales VLAN (IP subnet 171.G) flows are always partially Layer 3 switched.59. the multicast packet is dropped. The MSFC is the first-hop router to the source in PIM sparse mode (in this case. Layer 3 destination. reducing the load on the MSFC.0). The PFC prevents multicast traffic in flows that are completely Layer 3 switched from reaching the MSFC. the PFC periodically sends multicast packet and byte count statistics to the MSFC.

2 Dd:Cc 78-13315-02 .2:171.2 Data 171.1.59.1 171.2 Sub Sub n /M et 3 arke ting Host B 171. and Host C is on the Engineering VLAN (IPX address 02.59.59.2 Rewrite Src/Dst MAC Address Dd:Bb Dd:Cc Dd:Aa Destination VLAN Marketing Engineering Sales MAC = Bb MAC = Dd MSFC MAC = Aa Subnet 1/Sales Host A 171.2 Aa:Dd Figure 2 shows a simple IPX CEF network topology.Aa). When Host A initiates a file transfer to Host C.2. Catalyst 6000 Family Software Configuration Guide—Releases 6. the PFC2 uses the information in the FIB and adjacency table to forward packets from Host A to Host C. Host B is on the Marketing VLAN (IPX address 03.2.2.Cc).59.3.1.59.2.3 and 6.1.Chapter 13 Understanding How Layer 3 Switching Works Configuring CEF for PFC2 Figure 13-1 IP CEF Example Topology Source IP Address 171. In this example.59. Host A is on the Sales VLAN (IPX address 01.2 171.2 171.59.2:171.2.59.1 net 2/E ngin eeri ng MAC = Cc Data 171.59.59.2 171.4 13-8 44610 Host C 171.3.2 Destination IP Address 171.1.1.59.59.1.59.Bb).

Chapter 13 Configuring CEF for PFC2 Understanding How Layer 3 Switching Works Figure 13-2 IPX CEF Example Topology Source IPX Destination Rewrite Src/Dst Address IPX Address MAC Address 01. which are stored in the NetFlow table.Cc Dd:Cc 25482 Understanding NetFlow Statistics These sections describe NetFlow statistics: • • • NetFlow Statistics Overview.Cc 01. Note A NetFlow table with more than 32K entries increases the probability that there will be insufficient room to store statistics. page 13-x NetFlow Statistics Overview CEF for PFC2 generates flow statistics for Layer 3-switched traffic. you can exclude specified IP protocols from the statistics (see the “Excluding IP Protocol Entries from the NetFlow Table” section on page 13-xxv).3 and 6. page 13-x Flow Masks.Cc 03.Bb 02. To reduce the number of entries in the NetFlow table.Aa 01.Aa Dd:Bb Dd:Cc Dd:Aa Destination VLAN Marketing Engineering Sales MAC = Bb MAC = Dd MSFC MAC = Aa Net 1/Sales 01 Host A ti arke t 3/M 3 Ne 0 ng Host B Net 2/E ngin eer 02 Data 01. NetFlow statistics can be displayed with show commands and are also available to NetFlow Data Export (NDE).Aa 02. Catalyst 6000 Family Software Configuration Guide—Releases 6. page 13-ix NetFlow Table Entry Aging.Aa:02.4 78-13315-02 13-9 .Cc Aa:Dd Data ing MAC = Cc Host C 01.Aa:02.

When the flow mask changes. NetFlow Table Entry Aging The state and identity of flows are maintained while packet traffic is active. flow records are created based on the current flow mask. Flow Masks Flow masks determine how NetFlow table entries are created. the entry ages out.4 13-10 78-13315-02 . when traffic for a flow ceases. Use the keyword options to display information for specific traffic (refer to the Catalyst 6000 Family Command Reference publication for more information). the entry ages out and statistics for that flow can be exported to a flow collector application. CEF for PFC2 supports only one flow mask (the most specific one) for all statistics. it changes its flow mask to the most specific flow mask detected. some fields in the flow record might not have values. You can configure the aging time for NetFlow table entries kept in the NetFlow table. When CEF for PFC2 exports cached entries. Default CEF for PFC2 Configuration Table 2 shows the default CEF for PFC2 configuration. The statistics flow masks are as follows: • • • • • destination-ip—The least-specific flow mask for IP destination-ipx—The only flow mask for IPX source-destination-ip—For IP source-destination-vlan—For IP multicast full flow—The most-specific flow mask Enter the show mls statistics entry command to display the contents of the NetFlow table and the current flow mask. Depending on the current flow mask. Unsupported fields are filled with a zero (0).Chapter 13 Default CEF for PFC2 Configuration Configuring CEF for PFC2 NetFlow statistics supports unicast and multicast flows: • A unicast flow can be any of the following: – Destination only: all traffic to a particular destination – Destination-source: all traffic from a particular source to a particular destination – Full-flow: all traffic from a particular source to a particular destination that shares the same protocol and transport-layer information • A multicast flow is all traffic with the same protocol and transport-layer information from a particular source to the members of a particular destination multicast group. If CEF for PFC2 detects different flow masks from different MSFCs for which it is performing Layer 3 switching. If an entry is not used for the specified period of time. the entire NetFlow table is purged. Table 13-2 Default CEF for PFC2 Configuration Feature CEF for PFC2 enable state CEF enable state on MSFC2 Default Value Enabled (cannot be disabled) Enabled (cannot be disabled) Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.

– For IP multicast—Ethernet V2.3 and 6. CEF for PFC2 supports 225. Catalyst 6000 Family Software Configuration Guide—Releases 6. • • Because of the restriction to 16 unique HSRP group numbers.0 (ARPA) 802.0.* (where * is in the range 0–255).* through 239.0 (ARPA) 802. You can use the same HSRP group numbers in different VLANs.0.0. which is used by routing protocols.0.128.3 (raw) 802.0. CEF for PFC2 cannot support the standby use-bia HSRP command.* and 224.0 (ARPA) CEF for PFC2 does not provide Layer 3 switching for an IP multicast flow in the following cases: • For IP multicast groups that fall into the range 224.*.2 with 1 byte control (SAP1) SNAP Note When the ingress encapsulation for IPX traffic is SAP1. Note Identically numbered HSRP groups use the same virtual MAC address.2 with 1 byte control (SAP1) 802.3 with 802. If you configure more than 16 HSRP groups. this restriction prevents use of the VLAN number as the HSRP group number.3 with 802.0.Chapter 13 Configuring CEF for PFC2 CEF for PFC2 Configuration Guidelines and Restrictions Table 13-2 Default CEF for PFC2 Configuration (continued) Feature Multicast routing on MSFC2 PIM routing on MSFC2 IP MMLS Threshold IP MMLS Default Value Disabled globally Disabled on all interfaces Unconfigured—no default value Enabled when multicast routing is enabled and IP PIM is enabled on the interface Multicast services (IGMP snooping or GMRP) Disabled CEF for PFC2 Configuration Guidelines and Restrictions Follow these guidelines and restrictions when configuring CEF for PFC2: • PFC2 supports a maximum of 16 unique Hot Standby Router Protocol (HSRP) group numbers.0.128.* through 239. The MSFC2 routes IPX SAP1 traffic that requires an encapsulation change. CEF for PFC2 provides Layer 3 switching only when the egress encapsulation is also SAP1.2 and SNAP – For IPX: Ethernet V2. CEF for PFC2 supports the following ingress and egress encapsulations: – For IP unicast: Ethernet V2.4 78-13315-02 13-11 .0. which might cause errors if you configure bridging on the MSFC.

0. where xx is in the range 0–0xFF. packets in the flow that are not fragmented or that do not specify IP options are multilayer switched.0.0. No configuration is required. For any RPF interface with multicast tag switching enabled.1.4 13-12 78-13315-02 . page 13-xvi Note For information on configuring routing on the MSFC2.” Displaying Layer 3-Switching Entries on the Supervisor Engine CEF for PFC2 is permanently enabled on Supervisor Engine 2 with the PFC2 and the MSFC2.* range are reserved for routing control packets and must be flooded to all forwarding ports of the VLAN.39 and 224. If the shortest-path tree (SPT) bit for the flow is cleared when running PIM sparse mode for the interface or group. see Chapter 12.Chapter 13 Configuring CEF for PFC2 Configuring CEF for PFC2 Note Groups in the 224. For source traffic received on tunnel interfaces (such as MBONE traffic). To display all the Layer 3-switching entries on the supervisor engine. page 13-xiv Configuring IP Multicast on the MSFC2. the PIM interface configuration must be the same on both the active and the redundant MSFC2. page 13-xiv Displaying IP Multicast Information.3 and 6.40). Command show mls entry [cef] | [netflow-route] Catalyst 6000 Family Software Configuration Guide—Releases 6. perform this task: Task Display Layer 3-switching information. For PIM auto-RP multicast groups (IP multicast group addresses 224. For fragmented IP packets and packets with IP options. “Configuring InterVLAN Routing.1. However. These addresses map to the multicast MAC address range 01-00-5E-00-00-xx. • Note In systems with redundant MSFC2s.0. page 13-xii Configuring CEF on the MSFC2. • • • • Configuring CEF for PFC2 These sections describe how to configure CEF for PFC2: • • • • Displaying Layer 3-Switching Entries on the Supervisor Engine.

11 255.255.---.255.3 and 6.255.0 Mod --15 15 15 15 15 15 FIB-Type --------connected connected connected resolved resolved wildcard Dest-IPX-net -----------21 44 42 450 480 0 NextHop-IPX Weight ------------------------.0.0.255.0.0.1 255.255.255.255.255 16 receive 42.0.255 15 resolved 127.255.20 255.4 78-13315-02 13-13 .0.255.255 255.255.5 255.255. Enter the show mls entry netflow-route command to display only the entries from the TCP intercept feature and reflexive access control lists (ACLs).3EA9.0.255.255 15 receive 42.0.255 15 receive 43.255 16 receive 21.0.255.0.0.255.-----.255 15 receive 43.255 127.255 15 receive 255.0.255.255.0.1 255.255.0.255 16 receive 44.0 15 wildcard 0.0.0.0.--------------.--------------.0.11 1 15 receive 21.0 255.255.255 255.0.0.0 255.1 ICMP 200 100 0 01:03:25 01:00:52 cccccccc cccccccc 0.255.2 2 201 101 0 01:03:21 01:00:51 cccccccc cccccccc 0.5 0.0.255.0.---------cc-cc-cc-cc-cc-cc 5 cc-cc-cc-cc-cc-cc 2 cc-cc-cc-cc-cc-cc 4 cc-cc-cc-cc-cc-cc 1 cc-cc-cc-cc-cc-cc 3 cc-cc-cc-cc-cc-cc 6 ARPA 0 ARPA 0 ARPA 0 ARPA 0 ARPA 0 ARPA 0 Enter the show mls entry cef command to display only the FIB entries.255 255.99 255.0.255.255.255.--------0.4 0.0 255.255.0 240.0.--------.0.255.255.6 TCP 205 105 0 01:03:18 01:00:52 cccccccc cccccccc Console> (enable) Destination-Mac Vlan EDst Stat-Pkts ----------------.255 16 receive 44.255.0 0.0.0.255 15 receive 127.0.0.255.255.0.255.--------------.255.255.0.0.----.0.0050.4 4 203 X 0 01:03:19 01:00:51 cccccccc cccccccc 0.20.255 15 receive 192.-------.Chapter 13 Configuring CEF for PFC2 Configuring CEF for PFC2 This example shows how to display the Layer 3-switching entries: Console> (enable) show mls entry Mod FIB-Type Destination-IP Destination-Mask NextHop-IP Weight --.20.255.0.2.255.0.2 0.0.0.0.0.ABFD 42.0.0.255 16 receive 127.0.255.0 255.3 3 202 102 0 01:03:20 01:00:52 cccccccc cccccccc 0.ABFD 1 1 Destination-IP Source-IP Prot DstPrt SrcPrt Stat-Bytes Uptime Age TcpDltSeq TcpDltAck --------------.255 255.0.255 16 receive 21.255 16 receive 42.255.---.------ 42.0.255.0.0.255.255.---------------.255 255.0 255.0.255.255 16 receive 21.0.255.255 255.255 16 receive 127.---------------.255.255.20 255.255.0 255.0.255.0.12 255.255.-----15 receive 0.255.255.255 15 receive 44.0.255.0.--------.255.0.0.0.0.2.0.255 15 receive 43.0.255.0.0.0 255.0.255 16 receive 42.255.255 15 connected 43.0.0 15 drop 224.3EA9.255.0.5 5 204 104 0 01:03:18 01:00:51 cccccccc cccccccc 0.0.-------.4 255.1 0.3 0.6 0.0050. Catalyst 6000 Family Software Configuration Guide—Releases 6.255.

Configuring IP Multicast on the MSFC2 These sections describe how to configure the MSFC2 for IP multicast: • • • • Enabling IP Multicast Routing Globally. For more detailed IP multicast configuration information.Chapter 13 Configuring CEF for PFC2 Configuring CEF for PFC2 Configuring CEF on the MSFC2 CEF is permanently enabled on the MSFC2. page 13-xiv Enabling IP PIM on an MSFC2 Interface.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_c/ipcprt3/index.htm Enabling IP Multicast Routing Globally You must enable IP multicast routing globally on the MSFC2 before you can enable PIM on MSFC interfaces. page 13-xv Enabling IP MMLS on MSFC Interfaces. Note The ip load-sharing per-packet. refer to the “IP Multicast” section of the Cisco IOS IP and IP Routing Configuration Guide at http://www. The commands do not affect traffic that is switched by CEF for PFC2 on the supervisor engine.3 and 6. ip cef accounting per-prefix.cisco.4 13-14 78-13315-02 . page 13-xv Configuring the IP MMLS Global Threshold. No configuration is required to support CEF for PFC2. perform this task in global configuration mode: Task Enable IP multicast routing globally. To enable IP multicast routing globally on the MSFC2. page 13-xv Note This section describes how to enable IP multicast routing on the MSFC2. Command Router(config)# ip multicast-routing This example shows how to enable IP multicast routing globally: Router(config)# ip multicast-routing Router(config)# Catalyst 6000 Family Software Configuration Guide—Releases 6. and ip cef accounting non-recursive IOS CEF commands on the MSFC2 apply only to traffic that is CEF-switched on the MSFC.

This prevents creation of MLS entries for short-lived multicast flows. below which all multicast traffic is routed by the MSFC.3 and 6. clear the route and let it reestablish. Command Router(config)# [no] mls ip multicast threshold ppsec This example shows how to configure the IP MMLS threshold to 10 packets per second: Router(config)# mls ip multicast threshold 10 Router(config)# Use the no keyword to deconfigure the threshold. For information on configuring IP PIM on MSFC interfaces. specified in packets per second. perform this task: Task Configure the IP MMLS threshold. Note This command does not affect flows that are already being routed. Enabling IP MMLS on MSFC Interfaces IP MMLS is enabled by default on the MSFC interface when you enable IP PIM on the interface. Catalyst 6000 Family Software Configuration Guide—Releases 6. To configure the IP MMLS threshold. such as join requests. Command Router(config-if)# ip pim {dense-mode | sparse-mode | sparse-dense-mode} This example shows how to enable PIM on an MSFC2 interface using the default mode (sparse-dense-mode): Router(config-if)# ip pim Router(config-if)# This example shows how to enable PIM sparse mode on an MSFC2 interface: Router(config-if)# ip pim sparse-mode Router(config-if)# Configuring the IP MMLS Global Threshold You can configure a global multicast rate threshold. Note You must enable IP PIM on all participating MSFC interfaces before IP MMLS will function. To enable IP PIM on an MSFC2 interface.Chapter 13 Configuring CEF for PFC2 Configuring CEF for PFC2 Enabling IP PIM on an MSFC2 Interface You must enable PIM on MSFC2 interfaces before IP multicast will function on those interfaces. Perform this task only if you disabled IP MMLS on the interface and you want to reenable it. To apply the threshold to existing routes. see the “Enabling IP PIM on an MSFC2 Interface” section on page 13-xv.4 78-13315-02 13-15 . perform this task in interface configuration mode: Task Enable IP PIM on an MSFC2 interface.

page 13-xvii Displaying IP Multicast Details.3 and 6. page 13-xix Displaying IP MMLS Interface Information The show ip pim interface count command displays the IP MMLS enable state on MSFC IP PIM interfaces and the number of packets received and sent on the interface. The show ip interface command displays the IP MMLS enable state on an MSFC interface. Display the IP MMLS interface enable state.4 13-16 78-13315-02 . page 13-xvi Displaying IP Multicast Information on the Supervisor Engine.Chapter 13 Configuring CEF for PFC2 Configuring CEF for PFC2 To enable IP MMLS on an MSFC interface. To display IP MMLS information for an IP PIM MSFC interface. Command Router(config-if)# [no] mls ip multicast This example shows how to enable IP MMLS on an MSFC interface: Router(config-if)# mls ip multicast Router(config-if)# Use the no keyword to disable IP MMLS on an MSFC interface. page 13-xix Using Debug Commands on the SCP. page 13-xvi Displaying the IP Multicast Routing Table. Displaying IP Multicast Information These sections describe how to display IP multicast information: • • Displaying IP Multicast Information on the MSFC2. Command Router# show ip pim interface [type number] count Router# show ip interface Catalyst 6000 Family Software Configuration Guide—Releases 6. perform one of these tasks: Task Display IP MMLS interface information. page 13-xx Displaying IP Multicast Information on the MSFC2 These sections describe displaying IP multicast information on the MSFC2: • • • • • Displaying IP MMLS Interface Information. perform this task: Task Enable IP MMLS on an MSFC interface. page 13-xvii Using Debug Commands.

Command Router# show ip mroute [group[source]] | [summary] | [count] | [active kbps] This example shows how to display the IP multicast routing table: Router# show ip mroute 239. Command Router# show mls ip multicast group group-address [interface type number | statistics] Router# show mls ip multicast interface type number [statistics | summary] Router# show mls ip multicast summary Router# show mls ip multicast statistics Router# show mls ip multicast source ip-address [interface type number | statistics] Catalyst 6000 Family Software Configuration Guide—Releases 6. 239.1. To display the IP multicast routing table. 239.0. T .252.Pruned R .252.3 and 6.0.Proxy Join Timer Running A . RPF-MFD Outgoing interface list: Vlan10.Dense. perform this task: Task Display the IP multicast routing table.2 Outgoing interface list: Vlan10. J . Display IP MMLS details for all interfaces.0. L . State/Mode (*. RPF nbr 80.4 78-13315-02 13-17 . H (22. flags:SJ Incoming interface:Vlan800. 00:00:19/00:00:00.Register flag.MSDP created entry. C . To display detailed MMLS information on the MSFC.0. RP 80.Join SPT M .Sparse. 00:00:19/00:02:41. Display IP MMLS statistics. RPF nbr 80.1.Advertised via MSDP Outgoing interface flags:H . F . Forward/Dense. X .SPT-bit set.2. S . P . 04:04:59/00:02:59.1).Local. perform one of these tasks: Task Display IP MMLS group information.0. 01:29:57/00:00:00.1.0. Next-Hop or VCD. Forward/Dense.1). flags:JT Incoming interface:Vlan800. Display IP MMLS source information.1 IP Multicast Routing Table Flags:D . Display a summary of IP MMLS information.10. H Displaying IP Multicast Details The show mls ip multicast command displays detailed information about IP MMLS.0.Connected.2.Chapter 13 Configuring CEF for PFC2 Configuring CEF for PFC2 Displaying the IP Multicast Routing Table The show ip mroute command displays the IP multicast routing table on the MSFC2.Hardware switched Timers:Uptime/Expires Interface state:Interface.0.252.RP-bit set.

12.1. 224.1) Incoming interface: Vlan9. Packets switched: 0 Hardware switched outgoing interfaces: Vlan20 RFD-MFD installed: Vlan9 (1.1.9.4 13-18 78-13315-02 .9bfd.12. 224.3 and 6.Chapter 13 Configuring CEF for PFC2 Configuring CEF for PFC2 This example shows how to display IP MMLS statistics on the MSFC: Router# show mls ip multicast statistics MLS Multicast configuration and state: Router Mac:0050.1.1. Packets switched: 61590 Hardware switched outgoing interfaces: Vlan20 Vlan9 RFD-MFD installed: Vlan13 (1.1.1.123.1.13.12.1.1.1.234 MLS multicast operating state:ACTIVE Maximum number of allowed outstanding messages:1 Maximum size reached from feQ:1 Feature Notification sent:5 Feature Notification Ack received:4 Unsolicited Feature Notification received:0 MSM sent:33 MSM ACK received:33 Delete notifications received:1 Flow Statistics messages received:248 MLS Multicast statistics: Flow install Ack:9 Flow install Nack:0 Flow update Ack:2 Flow update Nack:0 Flow delete Ack:0 Complete flow install Ack:10 Complete flow install Nack:0 Complete flow delete Ack:1 Input VLAN delete Ack:4 Output VLAN delete Ack:0 Group delete sent:0 Group delete Ack:0 Global delete sent:7 Global delete Ack:7 L2 entry not found error:0 Generic error :3 LTL entry not found error:0 MET entry not found error:0 L3 entry exists error :0 Hash collision error :0 L3 entry not found error:0 Complete flow exists error :0 This example shows how to display information on a specific IP MMLS entry on the MSFC: Router# show mls ip multicast 224. 224.1.1 Multicast hardware switched flows: (1. Packets switched: 62010 Hardware switched outgoing interfaces: Vlan20 Vlan9 RFD-MFD installed: Vlan12 (1. Router IP:1.1) Incoming interface: Vlan13.3.1.0f2d.3.1) Incoming interface: Vlan12.1) Incoming interface: Vlan12.1.1. Packets switched: 61980 Hardware switched outgoing interfaces: Vlan20 Vlan9 RFD-MFD installed: Vlan12 Catalyst 6000 Family Software Configuration Guide—Releases 6.1.1. 224.

1) Incoming interface: Vlan11. Turns on MDSS-related events.1. Turns on all IP MMLS messages. Shows packet data trace. MDSS = Multicast Distributed Switching Services Displays IP MMLS events.3.1.Chapter 13 Configuring CEF for PFC2 Configuring CEF for PFC2 (1.1) Incoming interface: Vlan11. [no] debug mls ip multicast events [no] debug mls ip multicast errors [no] debug mls ip multicast messages [no] debug mls ip multicast all [no] debug mdss error [no] debug mdss events [no] debug mdss all 1. Catalyst 6000 Family Software Configuration Guide—Releases 6.1.1. Packets switched: 62430 Hardware switched outgoing interfaces: Vlan20 Vlan9 RFD-MFD installed: Vlan11 Total hardware switched installed: 6 Router# This example shows how to display a summary of IP MMLS information on the MSFC: Router# show mls ip multicast summary 7 MMLS entries using 560 bytes of memory Number of partial hardware-switched flows:2 Number of complete hardware-switched flows:5 Router# Using Debug Commands Table 3 describes IP MMLS-related debug troubleshooting commands. Turns on debug messages for multicast MLS-related errors. Displays IP MMLS messages from/to the hardware switching engine. Using Debug Commands on the SCP Table 4 describes the Serial Control Protocol (SCP)-related debug commands to troubleshoot the SCP that runs over the Ethernet out-of-band channel (EOBC). Table 13-3 IP MMLS Debug Commands Command Description [no] debug mls ip multicast group group_id group_mask Configures filtering that applies to all other multicast debugging commands. 224. Displays packet data in and out of the SCP system. Table 13-4 SCP Debug Commands Command [no] debug scp async [no] debug scp data [no] debug scp errors [no] debug scp packets Description Displays trace for asynchronous data in and out of the SCP system.4 78-13315-02 13-19 . Packets switched: 62430 Hardware switched outgoing interfaces: Vlan20 Vlan9 RFD-MFD installed: Vlan11 (1.11. Turns on all MDSS messages. Displays errors and warnings in the SCP.11. 224.3 and 6.1. Turns on MDSS1 error messages.1.1.

1.1. perform this task: Task Display IP multicast statistics. Command show mls multicast statistics [ip_addr] This example shows how to display IP multicast statistics for the MSFC2: Console (enable) show mls multicast statistics Router IP Router Name Router MAC ------------------------------------------------------1.9.5. Displaying IP Multicast Information on the Supervisor Engine These sections describe how to display IP multicast information: • • • Displaying IP Multicast Statistics. page 13-xxi Displaying IP Multicast Entries.252 ? 00-10-29-8d-88-01 Transmit: Delete Notifications: Acknowledgements: Flow Statistics: 22 75 22 Catalyst 6000 Family Software Configuration Guide—Releases 6. To display IP multicast statistics. page 13-xxi Displaying IP Multicast Statistics The show mls multicast statistics command displays IP multicast statistics.3 and 6. Turns on all SCP debugging messages. page 13-xx Clearing IP Multicast Statistics.Chapter 13 Configuring CEF for PFC2 Configuring CEF for PFC2 Table 13-4 SCP Debug Commands (continued) Command [no] debug scp timeouts [no] debug scp all Description Reports timeouts.254 ? 00-50-0f-06-3c-a0 Transmit: Delete Notifications: Acknowledgements: Flow Statistics: 23 92 56 Receive: Open Connection Requests: 1 Keep Alive Messages: 72 Shortcut Messages: 19 Shortcut Install TLV: 8 Selective Delete TLV: 4 Group Delete TLV: 0 Update TLV: 3 Input VLAN Delete TLV: 0 Output VLAN Delete TLV: 0 Global Delete TLV: 0 MFD Install TLV: 7 MFD Delete TLV: 0 Router IP Router Name Router MAC ------------------------------------------------------1.4 13-20 78-13315-02 .

1. You can display entries based on any combination of the participating MSFC2. Command clear mls multicast statistics This example shows how to clear IP multicast statistics: Console> (enable) clear mls multicast statistics All statistics for the MLS routers in include list are cleared. Console> (enable) Displaying IP Multicast Entries The show mls multicast entry command displays a variety of information about the multicast flows being handled by the PFC.1.1 224.Chapter 13 Configuring CEF for PFC2 Configuring CEF for PFC2 Receive: Open Connection Requests: Keep Alive Messages: Shortcut Messages: Shortcut Install TLV: Selective Delete TLV: Group Delete TLV: Update TLV: Input VLAN Delete TLV: Output VLAN Delete TLV: Global Delete TLV: MFD Install TLV: MFD Delete TLV: Console (enable) 1 68 6 4 2 0 0 0 0 0 4 0 Clearing IP Multicast Statistics The clear mls multicast statistics command clears IP multicast statistics.1 224.1 15870 473220 15759 473670 15810 473220 15840 2761380 82340280 2742066 82418580 2750940 82340280 2756160 20 12 20 11 20 12 20 Catalyst 6000 Family Software Configuration Guide—Releases 6.1.1.254 1.5.1 224. the VLAN.13.12.12.1. perform this task in privileged mode: Task Display information about IP multicast entries.------.1.1 224.1.1.3 1.----------. the multicast group address.1.254 1.5.1 224.11.1 1.-------1.---------.1.5.3 1.1. perform this task in privileged mode: Task Clear IP multicast statistics.1.1.252 1.--------------.4 78-13315-02 13-21 .1.1.1.3 and 6.254 1. To display information about IP multicast entries.1.9.1 1.9.1.1.1.9.1. To clear IP multicast statistics.252 224.252 1.1.1.11.3 1.1.1.1 1. Command show mls multicast entry [[[mod] [vlan vlan_id] [group ip_addr] [source ip_addr]] | [all]] This example shows how to display all IP multicast entries: Console> (enable) show mls multicast entry all Router IP Dest IP Source IP Pkts Bytes InVlan OutVlans --------------.11.1. or the multicast traffic source.1 1.12.--------------.5.1.252 1.1 224.1.

---------.1.25 172.--------------.159 224.--------172.--------------.1.1.1.1.11.8 1.49.1 1.3 Total Entries: 2 Console> (enable) multicast entry group 226.5.--------------.------.252 224.1.20.--------------.1.20.1 1.13.159 224.1.22.1.0.1.1.3 472770 15840 473667 82261980 2756160 82418058 13 20 11 This example shows how to display IP multicast entries for a specific MSFC2: Console> (enable) show mls multicast entry 15 Router IP Dest IP Source IP Pkts Bytes InVlan OutVlans --------------. page 13-xxiv Excluding IP Protocol Entries from the NetFlow Table.11.---------.-------1.3 short Source IP InVlan Pkts Bytes OutVlans -----------.1.2 396 235620 22 13.2.Chapter 13 Configuring NetFlow Statistics Configuring CEF for PFC2 1.2 99 65142 22 30.1.71 1.252 224.69.1.254 224.------------------------.49.1 1.----------171.1. page 13-xxv Displaying NetFlow Statistics.6 1.1.5.19 Console> (enable) Configuring NetFlow Statistics These sections describe how to configure NetFlow statistics: • • • • • • • Specifying the NetFlow Table Entry Aging-Time Value.22.1 1.9.-----.---------172.1.1.1.1. page 13-xxvi Displaying NetFlow Statistics Debug Information.3 and 6.1.1.252 224.1.5.1.1.1 1.1.12.1 Total Entries: 5 Console> (enable) 1.0.1 1.1.1.0.9 12 25 3120 8.1.20 This example shows how to display IP multicast entries for a specific MSFC2 and a specific multicast source address: Console> (enable) show mls multicast entry 15 source 1.1 1.1 1.40.1.1.2.1.12.1.1.9.1 short Router IP Dest IP Source IP Pkts Bytes InVlan OutVlans --------------.4 368 57776 40 23.201.49.37 172.22.1.2.4. page 13-xxiv Setting the Minimum Statistics Flow Mask.--------.1.1 15870 15759 15810 15840 15840 2761380 2742066 2750940 2756160 2756160 20 20 20 20 20 This example shows how to display IP multicast entries for a specific multicast group address: Console> (enable) show mls Router IP Dest IP -------------.1.13.3 1.5.4 13-22 78-13315-02 .1.3 1.1 226.1.69.1 1.12.1.11.1 Total Entries: 10 Console> (enable) 1. page 13-xxiii Specifying NetFlow Table IP Entry Fast Aging Time and Packet Threshold Values.1.5.1.1.-----.252 224.1 1.8 20 171 23512 10.20.159 224.1 226.3.45 172.1.1.254 224. page 13-xxviii Catalyst 6000 Family Software Configuration Guide—Releases 6.252 224. page 13-xxv Clearing NetFlow IP and IPX Statistics.----------.5.3 171.11.3.252 224.

perform this task in privileged mode: Task Command Specify the IPX entry aging time for the NetFlow set mls agingtime ipx [agingtime] table. For example. The default is 256 seconds. Any entry that has not been used for agingtime seconds is aged out. Command set mls agingtime [agingtime] This example shows how to specify the entry aging time: Console> (enable) set mls agingtime 512 Multilayer switching agingtime IP and IPX set to 512 Console> (enable) To specify the IP entry aging time.3 and 6. Any aging-time value that is not a multiple of 8 seconds is adjusted to the closest multiple of 8 seconds. To specify the entry aging time for both IP and IPX. perform this task in privileged mode: Task Specify the aging time for NetFlow table entries. perform this task in privileged mode: Task Specify the IP entry aging time for the NetFlow table. a value of 65 is adjusted to 64 and a value of 127 is adjusted to 128.4 78-13315-02 13-23 . This example shows how to specify the IPX entry aging time: Console> (enable) set mls agingtime ipx 512 Multilayer switching aging time IPX set to 512 Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.Chapter 13 Configuring CEF for PFC2 Configuring NetFlow Statistics Specifying the NetFlow Table Entry Aging-Time Value The entry aging time for each protocol (IP and IPX) applies to all protocol-specific NetFlow table entries. Command set mls agingtime ip [agingtime] This example shows how to specify the IP entry aging time: Console> (enable) set mls agingtime ip 512 Multilayer switching aging time IP set to 512 Console> (enable) To specify the IPX entry aging time. You can specify the aging time in the range of 8 to 2032 seconds in 8-second increments.

If you need to enable IP entry fast aging time. For information on how the different flow masks work. Command set mls agingtime fast [fastagingtime] [pkt_threshold] This example shows how to set the IP entry fast aging time to 32 seconds with a packet threshold of 0 packets: Console> (enable) set mls agingtime fast 32 0 Multilayer switching fast aging time set to 32 seconds for entries with no more than 0 packets switched. initially set the value to 128 seconds.3 and 6. decrease the setting. see the “Flow Masks” section on page 13-x. Note Entering a set mls flow command purges all existing entries in the NetFlow table. or 63 packets. Catalyst 6000 Family Software Configuration Guide—Releases 6. You can configure the pkt_threshold value to 0. 15. The default fastagingtime value is 0 (no fast aging). You can configure the fastagingtime value to 32. enable IP entry fast aging time. 1. 96. Detecting and aging out these entries saves space in the NetFlow table for other data traffic. A typical NetFlow table entry that is removed is the entry for flows to and from a Domain Name Server (DNS) or TFTP server. decrease the normal IP entry aging time. If the NetFlow table remains full. The IP entry fast aging time applies to NetFlow table entries that have no more than pkt_threshold packets routed within fastagingtime seconds after they are created. 64. If the NetFlow table continues to remain full.4 13-24 78-13315-02 . the entry might never be used again after it is created. To specify the IP entry fast aging time and packet threshold. 31. 7. perform this task in privileged mode: Task Specify the IP entry fast aging time and packet threshold for a NetFlow table entry. The actual flow mask used will be at least of the granularity specified by this command. 3.Chapter 13 Configuring NetFlow Statistics Configuring CEF for PFC2 Specifying NetFlow Table IP Entry Fast Aging Time and Packet Threshold Values Note IPX entries do not use fast aging. or 128 seconds. To minimize the size of the NetFlow table. Any fastagingtime value that is not configured exactly as the indicated values is adjusted to the closest one. Typical values for fastagingtime and pkt_threshold are 32 seconds and 0 packets (no packets switched within 32 seconds after the entry is created). Console> (enable) Setting the Minimum Statistics Flow Mask You can set the minimum granularity of the flow mask for the NetFlow table.

) To display a summary of NetFlow table entries and statistics. perform this task in privileged mode: Task Display all NetFlow table entries and statistics. Console> (enable) Excluding IP Protocol Entries from the NetFlow Table You can configure the NetFlow table to exclude specified IP protocols. ftp. To exclude IP protocols from the NetFlow table.3 and 6. Note: MLS exclusion only works in full flow mode. enter the show mls entry cef command (see the “Displaying Layer 3-Switching Entries on the Supervisor Engine” section on page 13-xii. Console> (enable) Displaying NetFlow Statistics Note To display the forwarding decision entries. Command set mls flow {destination | destination-source | full} This example shows how to set the minimum statistics flow mask to destination-source-ip: Console> (enable) set mls flow destination-source Configured IP flow mask is set to destination-source flow.Chapter 13 Configuring CEF for PFC2 Configuring NetFlow Statistics To set the minimum NetFlow statistics flow mask. smtp. x (X-Windows). Command set mls exclude protocol {tcp | upd | both} port The port parameter can be a port number or a keyword: dns. Command show mls This example shows how to display all NetFlow table entries: Console> (enable) show mls show mls ======= Total packets switched = 2 Total bytes switched = 112 Total routes = 48 Catalyst 6000 Family Software Configuration Guide—Releases 6. This example shows how to exclude Telnet traffic from the NetFlow table: Console> (enable) set mls exclude protocol tcp telnet NetFlow table will not create entries for TCP packets with protocol port 23.4 78-13315-02 13-25 . telnet. or www. perform this task in privileged mode: Task Set the minimum statistics flow mask. perform this task in privileged mode: Task Exclude IP protocols from the NetFlow table.

14 Last Used Destination IP Source IP Prot DstPrt SrcPrt Stat-Pkts Stat-Bytes --------------. set the src_port and dst_prt to 0 or no NetFlow statistics will display. page 13-xxvii Clearing NetFlow IP Statistics. Specify the destination address.-----. Catalyst 6000 Family Software Configuration Guide—Releases 6.10 6 50648 80 3152 347854 Console> Clearing NetFlow IP and IPX Statistics These sections describe clearing NetFlow statistics: • • • • Clearing All NetFlow Statistics. all NetFlow statistics are shown. If the protocol specified is not TCP or UDP. and source and destination ports to see the statistics for a specific NetFlow table entry. None of the clear mls commands affect forwarding entries or the NetFlow table entries that correspond to the forwarding entries.20.--------.--------------. the protocol. source address. and all NetFlow statistics are displayed (unspecified options are treated as wildcards).12: 172.Chapter 13 Configuring NetFlow Statistics Configuring CEF for PFC2 IP statistics flows aging time = 256 seconds IP statistics flows fast aging time = 0 seconds. If you do not specify a NetFlow table entry. packet threshold = 0 IP Current flow mask is Full flow Netflow Data Export version:7 Netflow Data Export disabled Netflow Data Export port/host is not configured.14 172.3 and 6. Total packets exported = 0 IPX statistics flows aging time = 256 seconds IPX flow mask is Destination flow IPX max hop is 15 Module 15:Physical MAC-Address 00-50-3e-a9-ab-fc Vlan Virtual MAC-Address(es) ---.22.----------MSFC 127. To display statistics for NetFlow table entries. A value of zero (0) for src_port or dst_port is treated as a wildcard.22.25. page 13-xxvii Clearing NetFlow IPX Statistics.20. and for IP.0. page 13-xxviii Note The clear mls commands affect only statistics.-----.0. Command show mls statistics entry [ip | ipx | uptime] [destination ip_addr_spec] [source ip_addr_spec] [flow protocol src_port dst_port] This example shows how to display NetFlow statistics for a particular NetFlow table entry: Console> show mls statistics entry ip destination 172.20.4 13-26 78-13315-02 .----------------------42 00-00-0c-07-ac-00 Console> The show mls statistics entry command can display all statistics or statistics for specific NetFlow table entries. page 13-xxviii Clearing NetFlow Statistics Totals. perform this task in privileged mode: Task Display statistics for NetFlow table entries.---.

udp. The flow keyword specifies the following additional flow information: • Protocol family (protocol)—Specify tcp.26. perform this task in privileged mode: Task Clear all NetFlow statistics.22 MLS IP entry cleared Console> (enable) This example shows how to clear statistics for NetFlow table entries with destination IP address 172.20.26.Chapter 13 Configuring CEF for PFC2 Configuring NetFlow Statistics Clearing All NetFlow Statistics To clear all NetFlow IP and IPX statistics.26. For other protocols. set the src_port and dst_port to 0. TCP source port 1652. The destination and source keywords specify the source and destination IP addresses. specify the source and destination TCP or UDP port numbers.20. or no entries will clear. perform this task in privileged mode: Task Clear statistics for a NetFlow table IP entry.3 and 6. Use the all keyword to clear all NetFlow IP statistics. The destination and source ip_addr_spec can be a full IP address or a subnet address in the format ip_subnet_addr.4 78-13315-02 13-27 .113 flow tcp 1652 23 MLS IP entry cleared Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. A value of zero (0) for src_port or dst_port is treated as a wildcard (unspecified options are treated as wildcards). or ip_addr/subnet_mask_bits. TCP or UDP source and destination port numbers (src_port and dst_port)—If the protocol you specify is TCP or UDP.22 source 172. Command clear mls statistics entry ip [destination ip_addr_spec] [source ip_addr_spec] [flow protocol src_port dst_port] [all] This example shows how to clear statistics for NetFlow table entries with destination IP address 172. Command clear mls statistics entry all This example shows how to clear all NetFlow statistics: Console> (enable) clear mls statistics entry all All MLS IP and IPX entries cleared.113. • To clear statistics for a NetFlow table IP entry.22. and TCP destination port 23: Console> (enable) clear mls statistics entry destination 172.20.20.22: Console> (enable) clear mls statistics entry ip destination 172. ip_addr/subnet_mask. Console> (enable) Clearing NetFlow IP Statistics The clear mls statistics entry ip command clears NetFlow IP statistics.22. icmp.20. A value of zero (0) for protocol is treated as a wildcard (unspecified options are treated as wildcards). or a decimal number for other protocol families.

To clear statistics for a NetFlow table IPX entry.0002. perform this task in privileged mode: Task Clear statistics for a NetFlow table IPX entry. Console> (enable) Displaying NetFlow Statistics Debug Information The show mls debug command displays NetFlow statistics debug information that you can send to your technical support representative for analysis if necessary.6000 MLS IPX entry cleared.00e0. perform this task in privileged mode: Task Clear NetFlow statistics totals. perform this task: Task Display NetFlow statistics debug information that you can send to your technical support representative. Command clear mls statistics This example shows how to clear NetFlow statistics totals: Console> (enable) clear mls statistics All mls statistics cleared. Use application-specific commands to get more information about particular applications. Command show mls debug Note The show tech-support command displays supervisor engine system information.00e0. The destination and source keywords specify the source and destination IPX addresses.fefc.6000: Console> (enable) clear mls statistics entry ipx destination 1.fefc. To display NetFlow statistics debug information.Chapter 13 Configuring NetFlow Statistics Configuring CEF for PFC2 Clearing NetFlow IPX Statistics The clear mls statistics entry ipx command clears NetFlow IPX statistics.4 13-28 78-13315-02 . Command clear mls statistics entry ipx [destination ipx_addr_spec] [source ipx_addr_spec] [all] This example shows how to clear statistics for IPX MLS entries with destination IPX address 1. Console> (enable) Clearing NetFlow Statistics Totals The clear mls statistics command clears the following NetFlow statistics: • • Total packets switched (IP and IPX) Total packets exported (for NDE) To clear NetFlow statistic totals.3 and 6. Use the all keyword to clear all NetFlow IPX statistics.0002. Catalyst 6000 Family Software Configuration Guide—Releases 6.

See Chapter 13. page 14-i Default MLS Configuration. page 14-x Configuration Guidelines and Restrictions. PFC2.4 78-13315-02 14-1 . Note Layer 3 switching supports the routing protocols configured on the MSFC. Layer 3 switching uses NetFlow Data Export (NDE) to export flow statistics (for more information about NDE. page 14-xi Configuring MLS. see Chapter 15. planning. instead of a router. MLS provides IP and Internetwork Packet Exchange (IPX) unicast Layer 3 switching and IP multicast Layer 3 switching with Supervisor Engine 1. Layer 3 switching does not replace the routing protocols configured on the MSFC. to forward IP and IPX unicast traffic and IP multicast traffic between VLANs. Catalyst 6000 Family Software Configuration Guide—Releases 6. and MSFC2 provide Layer 3 switching with Cisco Express Forwarding for PFC2 (CEF for PFC2). Note For complete information on the syntax and usage information for the supervisor engine commands used in this chapter. “Configuring NDE”). This chapter consists of these sections: • • • • Understanding How Layer 3 Switching Works. Layer 3 switching uses IP Protocol Independent Multicast (IP PIM) for multicast route determination. Layer 3 switching requires minimal support from the MSFC. page 14-xiv Note Supervisor Engine 2. the Policy Feature Card (PFC).” for more information. refer to the Catalyst 6000 Family Command Reference publication. Layer 3 switching is implemented in hardware and provides wire-speed interVLAN forwarding on the switch. The MSFC routes any traffic that cannot be Layer 3 switched.C H A P T E R 14 Configuring MLS This chapter describes how to configure Multilayer Switching (MLS) for the Catalyst 6000 family switches. and the Multilayer Switch Feature Card (MSFC) or MSFC2. Layer 3 switching on Catalyst 6000 family switches provides traffic statistics that you can use to identify traffic characteristics for administration. and troubleshooting. rather than on the MSFC.3 and 6. “Configuring CEF for PFC2. Understanding How Layer 3 Switching Works Layer 3 switching allows the switch.

replicates as necessary) the rewritten packet to Destination B’s VLAN. These sections describe how the packets are rewritten: • • • Understanding IP Unicast Rewrite. page 14-iii Understanding IP Multicast Rewrite. the switch recognizes that the packet was sent to the Layer 2 (MAC) address of the MSFC. page 14-ii Understanding IPX Unicast Rewrite. changing the Layer 2 destination address to the Layer 2 address of Destination B and the Layer 2 source address to the Layer 2 address of the MSFC. To perform Layer 3 switching. the switch increments the Layer 3 Transport Control value by 1 and recomputes the Layer 3 packet checksum. The switch recomputes the Layer 2 frame checksum and forwards (or for multicast packets. In IP unicast and IP multicast traffic.3 and 6. In IPX traffic. page 14-iii Understanding IP Unicast Rewrite Received IP unicast packets are (conceptually) formatted as follows: Layer 2 Frame Header Destination MSFC MAC Source Source A MAC Layer 3 IP Header Destination Destination B IP Source Source A IP TTL n Checksum calculation1 Data FCS Catalyst 6000 Family Software Configuration Guide—Releases 6.4 14-2 78-13315-02 . page 14-ii Understanding MLS. the switch decrements the Layer 3 Time to Live (TTL) value by 1 and recomputes the Layer 3 packet checksum. The Layer 3 addresses remain the same. page 14-iv Understanding Layer 3-Switched Packet Rewrite When a packet is Layer 3 switched from a source in one VLAN to a destination in another VLAN. the switch performs a packet rewrite at the egress port based on information learned from the MSFC so that the packets appear to have been routed by the MSFC.Chapter 14 Understanding How Layer 3 Switching Works Configuring MLS These sections describe Layer 3 switching and MLS on the Catalyst 6000 family switches: • • Understanding Layer 3-Switched Packet Rewrite. Note Rather than just forwarding multicast packets. Packet rewrite alters five fields: • • • • • Layer 2 (MAC) destination address Layer 2 (MAC) source address Layer 3 IP Time to Live (TTL) or IPX Transport Control Layer 3 checksum Layer 2 (MAC) checksum (also called the frame checksum or FCS) If Source A and Destination B are on different VLANs and Source A sends a packet to the MSFC to be routed to Destination B. the switch rewrites the Layer 2 frame header. the switch replicates them as necessary on the appropriate VLANs.

it is (conceptually) formatted as follows: Layer 2 Frame Header Destination Source Layer 3 IPX Header Checksum/ IPX Length/ Transport Control n+1 Destination Net/ Node/ Socket Destination B IPX Source Net/ Node/ Socket Source A IPX Data FCS Destination B MAC MSFC MAC Understanding IP Multicast Rewrite Received IP multicast packets are (conceptually) formatted as follows: Layer 2 Frame Header Destination Group G1 MAC 1 Layer 3 IP Header Source Source A MAC Destination Group G1 IP Source Source A IP TTL n Checksum calculation1 Data FCS 1.4 78-13315-02 14-3 . After the switch rewrites an IP multicast packet. Destination B is a member of Group G1.Chapter 14 Configuring MLS Understanding How Layer 3 Switching Works After the switch rewrites an IP unicast packet.3 and 6. it is (conceptually) formatted as follows: Layer 2 Frame Header Destination Group G1 MAC Source MSFC MAC Layer 3 IP Header Destination Group G1 IP Source Source A IP TTL n–1 Checksum calculation2 Data FCS Catalyst 6000 Family Software Configuration Guide—Releases 6. In this example. it is (conceptually) formatted as follows: Layer 2 Frame Header Destination Source Layer 3 IP Header Destination Source TTL Checksum calculation2 Data FCS Destination B MAC MSFC MAC Destination B IP Source A IP n-1 Understanding IPX Unicast Rewrite Received IPX packets are (conceptually) formatted as follows: Layer 2 Frame Header Destination Source Layer 3 IPX Header Checksum/ IPX Length/ Transport Control n Destination Net/ Node/ Socket Destination B IPX Source Net/ Node/ Socket Source A IPX Data FCS MSFC MAC Source A MAC After the switch rewrites an IPX packet.

Layer 3 switching with MLS identifies flows on the switch after the first packet has been routed by the MSFC and transfers the process of forwarding the remaining traffic in the flow to the switch. Supervisor Engine 1. or flows. actual network traffic consists of many end-to-end conversations. and MSFC or MSFC2 provide Layer 3 switching with MLS. Telnet traffic transferred from a particular source to a particular destination comprises a separate flow from File Transfer Protocol (FTP) packets between the same source and destination. page 14-viii MLS Examples.Chapter 14 Understanding How Layer 3 Switching Works Configuring MLS Understanding MLS Note Supervisor Engine 1. are connectionless—they deliver every packet independently of every other packet. These sections describe MLS: • • • • • Understanding MLS Flows. page 14-viii Understanding MLS Flows Layer 3 protocols. page 14-iv Understanding the MLS Cache. Note The PFC uses the Layer 2 multicast forwarding table to identify the ports to which Layer 2 multicast traffic should be forwarded (if any). page 14-v Understanding Flow Masks. However. PFC. The multicast forwarding table entries are populated by whichever multicast constraint feature is enabled on the switch (IGMP snooping or Generic Attribute Registration Protocol [GARP] Multicast Registration Protocol [GMRP]). Catalyst 6000 Family Software Configuration Guide—Releases 6.4 14-4 78-13315-02 . which reduces the load on the MSFC. such as IP and IPX.3 and 6. These entries map the destination multicast MAC address to the outgoing switch ports for a given VLAN. For example. page 14-vi Partially and Completely Switched Multicast Flows. MLS supports unicast and multicast flows: • A unicast flow can be any of the following: – All traffic to a particular destination – All traffic from a particular source to a particular destination – All traffic from a particular source to a particular destination that shares the same protocol and transport-layer information • A multicast flow is all traffic with the same protocol and transport-layer information from a particular source to the members of a particular destination multicast group. between users or applications. PFC. an external MLS-RP cannot be used in place of the internal MLS-RP. communication from a client to a server and from the server to the client are separate flows. and MSFC or MSFC2 can only do MLS internally with the MSFC or MSFC2 in the same chassis.

In addition. packets identified as belonging to an existing flow can be Layer 3 switched based on the cached information. page 14-vi MLS Cache Size. the PFC creates a new MLS entry. the entry ages out and statistics for that flow can be exported to a flow collector application.Chapter 14 Configuring MLS Understanding How Layer 3 Switching Works Understanding the MLS Cache These sections describe the MLS cache: • • • • • MLS Cache. the PFC creates an MLS cache entry for the initial routed packet of each unicast flow. Unicast Traffic For unicast traffic. Using the no ip multicast-routing command to disable IP multicast routing on the MSFC purges all multicast MLS cache entries on the PFC. These MSFC IOS commands affect the multicast MLS cache entries on the switch: • • Using the clear ip mroute command to clear the multicast routing table on the MSFC clears all multicast MLS cache entries on the PFC. Catalyst 6000 Family Software Configuration Guide—Releases 6. the entry ages out. MLS Cache Aging The state and identity of flows are maintained while packet traffic is active. it updates its multicast routing table and forwards the new information to the PFC. You can configure the aging time for MLS entries kept in the MLS cache. the PFC maintains a list of outgoing interfaces for the destination IP multicast group. page 14-vi MLS Cache The PFC maintains a Layer 3 switching table called the MLS cache for Layer 3-switched flows. After the PFC creates an MLS cache entry. The MLS cache maintains flow information for all active flows. if an entry in the multicast routing table ages out.4 78-13315-02 14-5 .3 and 6. The cache also includes entries for traffic statistics that are updated in tandem with the switching of packets. the PFC populates the MLS cache using information learned from the MSFC. page 14-v Multicast Traffic. Multicast Traffic For multicast traffic. Whenever the MSFC receives traffic for a new multicast flow. If an entry is not used for the specified period of time. page 14-v MLS Cache Aging. when traffic for a flow ceases. page 14-v Unicast Traffic. The PFC uses this list to identify the VLANs on which traffic to a given multicast flow should be replicated. the MSFC deletes the entry and forwards the updated information to the PFC. Upon receipt of a routed packet that does not match any unicast flow currently in the MLS cache. For each multicast flow cache entry.

All flows to a given destination IPX address use this IPX MLS entry. and IPX MLS). The PFC maintains one IPX MLS entry for each destination IPX address (network and node). The PFC maintains one MLS entry for each Layer 3 destination address. All flows to a given Layer 3 destination address use this MLS entry. The MLS cache is shared by all MLS processes on the switch (IP MLS. some fields in the flow record might not have values. The PFC creates and maintains a separate MLS cache entry for each IP flow. The multicast source-destination-vlan flow mask differs from the IP unicast MLS source-destination-ip flow mask in that. and protocol ports. it changes its flow mask to the most specific flow mask detected. The MLS flow masks are as follows: • • destination-ip—The least-specific flow mask. page 14-vii Flow Mask Modes The PFC supports only one flow mask (the most specific one) for all MSFCs that are Layer 3 switched by that PFC. Unsupported fields are filled with a zero (0). A full flow entry includes the source IP address. destination group IP. page 14-vi Flow Mask Mode and show mls entry Command Output. An MLS cache larger than 32K entries increases the probability that a flow will not be Layer 3 switched. full flow—The most-specific flow mask. If the PFC detects different flow masks from different MSFCs for which it is performing Layer 3 switching. source-destination-vlan—For IP MMLS.4 14-6 78-13315-02 . When the PFC exports cached entries.Chapter 14 Understanding How Layer 3 Switching Works Configuring MLS MLS Cache Size The maximum MLS cache size is 128K entries. The source VLAN is the multicast reverse path forwarding (RPF) interface for the multicast flow.3 and 6. These sections describe the flow mask modes: • • Flow Mask Modes. but will instead be forwarded to the MSFC. the entire MLS cache is purged. Depending on the current flow mask. protocol. destination IP address. for IP MMLS. All flows between a given source and destination use this MLS entry regardless of the IP protocol ports. Understanding Flow Masks The PFC uses flow masks to determine how MLS entries are created. IP MMLS. source VLAN}. When the PFC flow mask changes. The PFC maintains one MMLS cache entry for each {source IP. • • • Catalyst 6000 Family Software Configuration Guide—Releases 6. destination-ipx—The only flow mask mode for IPX MLS is destination mode. flow records are created based on the current flow mask. the source VLAN is included as part of the entry. source-destination-ip—The PFC maintains one MLS entry for each source and destination IP address pair.

--------.---.69.-------171.-----.-------171.69.----------------ESrc EDst SPort DPort Stat-Pkts Stat-Byte Uptime Age ---.1.----------------ESrc EDst SPort DPort Stat-Pkts Stat-Byte Uptime Age ---.----. source port. and destination port fields display the details of the last packet that was Layer 3 switched using the MLS cache entry.42 00-60-70-6c-fc-23 SNAP ARPA 5/8 1/1 2345 123456 09:03:32 09:08:12 Total Entries: 2 * indicates TCP flow has ended Console> (enable) Vlan ---- 4 2 With the full-flow flow mask.234 171.41 00-60-70-6c-fc-22 ARPA SNAP 5/8 11/1 3152 347854 09:01:19 09:08:20 171. This example shows how the show mls entry command output appears in source-destination-ip mode: Console> (enable) show mls entry ip short Destination-IP Source-IP Prot DstPrt SrcPrt Destination-Mac --------------.192.1.192.----.69. and source and destination port fields show the details of the last packet that was Layer 3 switched using the MLS cache entry.200.--------.-----.-----------.--------------.234 00-60-70-6c-fc-22 ARPA SNAP 5/8 11/1 3152 347854 09:01:19 09:08:20 171.69.Chapter 14 Configuring MLS Understanding How Layer 3 Switching Works Flow Mask Mode and show mls entry Command Output With the destination-ip flow mask. the protocol.3 and 6. because a separate MLS entry is created for every ip flow. This example shows how the show mls entry command output appears in destination-ip mode: Console> (enable) show mls entry ip short Destination-IP Source-IP Prot DstPrt SrcPrt Destination-Mac --------------.192.-----.42 UDP 2049 41636 00-60-70-6c-fc-23 SNAP ARPA 5/8 1/1 2345 123456 09:03:32 09:08:12 Total Entries: 2 * indicates TCP flow has ended Console> (enable) Vlan ---- 4 2 Catalyst 6000 Family Software Configuration Guide—Releases 6.----.192.69.-------.--------------.200.--------.-------171.1.69. The default is long (no text wrap).-----.-----------.-----------.----------------ESrc EDst SPort DPort Stat-Pkts Stat-Byte Uptime Age ---.-------.200.69.133 171. protocol.-----.4 78-13315-02 14-7 .234 171.----.-----.----.--------------. details are shown for each flow.69.69.69.-------.---.----.41 TCP* 6000 59181 00-60-70-6c-fc-22 ARPA SNAP 5/8 11/1 3152 347854 09:01:19 09:08:20 171.----.133 171.133 00-60-70-6c-fc-23 SNAP ARPA 5/8 1/1 2345 123456 09:03:32 09:08:12 Total Entries: 2 * indicates TCP flow has ended Console> (enable) Vlan ---- 4 2 Note The short keyword exists for some show commands and displays the output by wrapping the text after 80 characters. This example shows how the show mls entry command output appears in full flow mode: Console> (enable) show mls entry ip short Destination-IP Source-IP Prot DstPrt SrcPrt Destination-Mac --------------. With the source-destination-ip flow mask.----. the source IP.----.---.

When Host A initiates an HTTP file transfer to Host C. MLS Examples Figure 1 shows a simple IP MLS network topology.2.0). The multicast TTL threshold is configured on an egress interface for the flow. The multicast helper is configured on the RPF interface for the flow. the PFC periodically sends multicast packet and byte count statistics to the MSFC.Chapter 14 Understanding How Layer 3 Switching Works Configuring MLS Partially and Completely Switched Multicast Flows Some flows might be partially Layer 3 switched instead of completely Layer 3 switched in these situations: • • • • • • • The MSFC is configured as a member of the IP multicast group (using the ip igmp join-group command) on the RPF interface of the multicast source. The PFC stores the MAC addresses of the MSFC and Host C in the MLS entry when the MSFC forwards the first packet from Host A through the switch to Host C. The extended access list deny condition on the RPF interface specifies anything other than the Layer 3 source. the multicast packet is dropped. reducing the load on the MSFC. Host A is on the Sales VLAN (IP subnet 171.59. because the MSFC cannot record multicast statistics for completely switched flows. For all completely Layer 3-switched flows. an MLS entry for this flow is created (this entry is the second item in the MLS cache shown in Figure 1). Multicast tag switching is configured on an egress interface. the MSFC must send PIM-register messages to the rendezvous point). Network address translation (NAT) is configured on an interface.4 14-8 78-13315-02 . The PFC uses this information to rewrite subsequent packets from Host A to Host C. Host B is on the Marketing VLAN (IP subnet 171. The PFC prevents multicast traffic in flows that are completely Layer 3 switched from reaching the MSFC. all multicast traffic belonging to the flow reaches the MSFC and is software switched for any interface that is not Layer 3 switched.0). The MSFC is the first-hop router to the source in PIM sparse mode (in this case. The show ip mroute and show mls ip multicast commands identify completely Layer 3-switched flows with the text string RPF-MFD (Multicast Fast Drop [MFD] indicates that from the perspective of the MSFC. because it is switched by the PFC). In this example.3.59. Catalyst 6000 Family Software Configuration Guide—Releases 6. The MSFC uses the statistics to update the corresponding multicast routing table entries and reset the appropriate expiration timers. or IP protocol (an example is Layer 4 port numbers). and Host C is on the Engineering VLAN (IP subnet 171.3 and 6.1. and multicast to broadcast translation is required.0). which it never sees. and source address translation is required for the outgoing interface.59. For partially switched flows. Layer 3 destination.

1. Similarly.1.2.3.Cc).59.2: 2000 Dd:Cc 25481 Figure 2 shows a simple IPX MLS network topology.1. The destination VLAN is stored as part of each IPX MLS entry so that the correct VLAN identifier is used when encapsulating traffic on trunk links. Catalyst 6000 Family Software Configuration Guide—Releases 6.59.2 Data 171.2. The PFC uses this information to rewrite subsequent packets from Host A to Host B.1 Sub Host A 171. an IPX MLS entry for this flow is created (this entry is the first item in the table shown in Figure 1). The PFC stores the MAC addresses of the MSFC and Host B in the IPX MLS entry when the MSFC forwards the first packet from Host A through the switch to Host B.59. and Host C is on the Engineering VLAN (IPX address 02. a separate IPX MLS entry is created in the MLS cache for the traffic from Host A to Host C. Host B is on the Marketing VLAN (IPX address 03.59.Aa).2.4 78-13315-02 14-9 .2 171. and for the traffic from Host C to Host A. In this example.1 171.59.2 171.3.2: 2000 Aa:Dd Host C 171. When Host A initiates a file transfer to Host B.2 171.59. Host A is on the Sales VLAN (IPX address 01.59.Chapter 14 Configuring MLS Understanding How Layer 3 Switching Works Figure 14-1 IP MLS Example Topology Source IP Address 171.1.2 Application FTP HTTP HTTP Rewrite Src/Dst MAC Address Dd:Bb Dd:Cc Dd:Aa Destination VLAN Marketing Engineering Sales MAC = Bb MAC = Dd MSFC MAC = Aa Subnet 1/Sales Sub n /M et 3 arke ting Host B 171.Bb).3 and 6.1.59.2 Destination IP Address 171.59.2 net 2/E ngin eeri ng MAC = Cc Data 171.59.59.1.

Aa 01. Table 14-2 Default IP MMLS Supervisor Engine Configuration Feature IP MMLS Default Value Enabled Multicast services (IGMP snooping or GMRP) Disabled Catalyst 6000 Family Software Configuration Guide—Releases 6.Cc Aa:Dd Data ing MAC = Cc Host C 01.Cc Dd:Cc 25482 Default MLS Configuration Table 1 shows the default IP MLS configuration.Chapter 14 Default MLS Configuration Configuring MLS Figure 14-2 IPX MLS Example Topology Source IPX Destination Rewrite Src/Dst Address IPX Address MAC Address 01.Cc 01.Aa 02.Cc 03.3 and 6.Aa Dd:Bb Dd:Cc Dd:Aa Destination VLAN Marketing Engineering Sales MAC = Bb MAC = Dd MSFC MAC = Aa Net 1/Sales 01 Host A ti arke t 3/M 3 Ne 0 ng Host B Net 2/E ngin eer 02 Data 01.4 14-10 78-13315-02 .Aa:02. Table 14-1 Default IP MLS Configuration Feature IP MLS enable state IP MLS aging time IP MLS fast aging time IP MLS fast aging-time packet threshold Default Value Enabled 256 seconds 0 seconds (no fast aging) 0 packets Table 2 shows the default IP MMLS switch configuration.Bb 02.Aa:02.

Catalyst 6000 Family Software Configuration Guide—Releases 6. To change the MTU on an IP MLS-enabled interface.4 78-13315-02 14-11 . page 14-xi IP MMLS.3 and 6. page 14-xii Maximum Transmission Unit Size The default maximum transmission unit (MTU) for IP MLS is 1500. Table 14-4 Default IPX MLS Configuration Feature IPX MLS enable state IPX MLS aging time Default Value Enabled 256 seconds Configuration Guidelines and Restrictions These sections describe configuration guidelines and restrictions: • • • IP MLS. Table 14-3 Default IP MMLS MSFC Configuration Feature Multicast routing IP PIM routing IP MMLS Threshold IP MMLS Default Value Disabled globally Disabled on all interfaces Unconfigured—no default value Enabled when multicast routing is enabled and IP PIM is enabled on the interface Table 4 shows the default IPX MLS configuration. enter the ip mtu mtu command. page 14-xi Restrictions on Using IP Routing Commands with IP MLS Enabled.Chapter 14 Configuring MLS Configuration Guidelines and Restrictions Table 3 shows the default IP MMLS MSFC configuration. page 14-xiii IP MLS These sections describe IP MLS configuration guidelines: • • Maximum Transmission Unit Size. page 14-xii IPX MLS.

the corresponding Layer 3 flow information is purged. When using two MSFCs that have one or more interfaces in the same VLAN. IP MMLS These sections describe IP MMLS configuration guidelines: • • • IP MMLS Supervisor Engine Guidelines and Restrictions. Table 14-5 IP Routing Command Restrictions Command clear ip route ip routing ip security (all forms of this command) ip tcp header-compression Behavior Clears all MLS cache entries for all switches performing Layer 3 switching for this MSFC. • • • Catalyst 6000 Family Software Configuration Guide—Releases 6.4 14-12 78-13315-02 . ip tcp compression-connections Disables IP MLS on the interface. The no form purges all MLS cache entries and disables IP MLS on this MSFC. the switch uses two reserved VLANs (VLANs 1012 and 1013) internally to forward multicast flows properly. The MSFC will not act as an external router for a Catalyst 5000 family switch that has Layer 3 switching hardware. Disables IP MLS on the interface. page 14-xiii Unsupported IP MMLS Features. You must enable one of the multicast services (IGMP snooping or GMRP) on the switch in order to use IP MMLS. page 14-xii IP MMLS MSFC Configuration Restrictions. Disables IP MLS on the interface. if no Layer 2 multicast services are enabled or the forwarding table is full).3 and 6.Chapter 14 Configuration Guidelines and Restrictions Configuring MLS Restrictions on Using IP Routing Commands with IP MLS Enabled Enabling certain IP processes on an interface will affect IP MLS on the interface. Subnetwork Address Protocol (SNAP) rewrites are not supported. Table 5 shows the affected commands and the resulting behavior. page 14-xiii IP MMLS Supervisor Engine Guidelines and Restrictions These guidelines and restrictions apply when configuring Supervisor Engine 1 for IP MMLS: • • • • Only ARPA rewrites are supported for IP multicast packets. Enter the show multicast group command to check for a Layer 2 entry for a particular IP multicast destination. If a Layer 2 entry is cleared. IP multicast flows are not multilayer switched if there is no entry in the Layer 2 multicast forwarding table (for example.

IP accounting for the interface will not reflect accurate values.0. packets in the flow that are not fragmented or that do not specify IP options are multilayer switched.1. Note In systems with redundant MSFCs.* through 239.* range are reserved for routing control packets and must be flooded to all forwarding ports of the VLAN.0.3 and 6. the IP PIM interface configuration must be the same on both the active and redundant MSFCs. For source traffic received on tunnel interfaces (such as MBONE traffic). These addresses map to the multicast MAC address range 01-00-5E-00-00-xx. IPX EIGRP—To support MLS on EIGRP interfaces you must set the Transport Control (TC) maximum to a value greater than the default (16). with the tc_value greater than 16.* 224.Chapter 14 Configuring MLS Configuration Guidelines and Restrictions IP MMLS MSFC Configuration Restrictions IP MMLS does not perform multilayer switching for an IP multicast flow in the following situations: • For IP multicast groups that fall into these ranges (where * is in the range 0–255): 224. For any RPF interface with multicast tag switching enabled.* through 239. Enter the ipx maximum-hop tc_value global configuration command on the MSFC.G.0.0.0.128. • • • • • For flows that are forwarded on the multicast-shared tree (that is.1.40). If the shortest-path tree (SPT) bit for the flow is cleared when running IP PIM sparse mode for the interface or group. For fragmented IP packets and packets with IP options. However. Catalyst 6000 Family Software Configuration Guide—Releases 6.4 78-13315-02 14-13 . Unsupported IP MMLS Features If you enable IP MMLS.0.* Note Groups in the 224.0.0.128.*} forwarding) when the interface or group is running IP PIM sparse mode. {*.39 and 224.0. • For IP PIM auto-RP multicast groups (IP multicast group addresses 224. IPX MLS These sections describe configuration guidelines that apply when configuring IPX MLS: • • IPX MLS Interaction with Other Features. page 14-xiv IPX MLS Interaction with Other Features Other IOS software features affect IPX MLS as follows: • • IPX accounting—IPX accounting cannot be enabled on an IPX MLS-enabled interface.0. where xx is in the range 0–0xFF. page 14-xiii IPX MLS and Maximum Transmission Unit Size.

Command Router(config)# interface vlan-id Router(config-if)# no mls ip Router(config-if)# no mls ipx Catalyst 6000 Family Software Configuration Guide—Releases 6. Disabling and Enabling Unicast MLS on an MSFC Interface Unicast MLS for IP and IPX is enabled globally by default. Note The MSFC can be specified as the MLS route processor (MLS-RP) for Catalyst 5000 family switches using MLS. for MLS configuration procedures.3 and 6. page 14-xv Using Debug Commands on the MSFC. see the “Configuring MLS on Supervisor Engine 1” section on page 14-xvii. but can be disabled and enabled on a specified interface. perform this task: Task Specify an MSFC interface. The MTU size is limited by the media type. page 14-xiv Displaying MLS Information on the MSFC. To disable unicast IP or IPX MLS on a specific MSFC interface.4 14-14 78-13315-02 . the two end points of communication negotiate the maximum transmission unit (MTU) to be used. page 14-xiv Configuring MLS on Supervisor Engine 1. page 14-xvi Using Debug Commands on the SCP.” For information on configuring unicast Layer 3 switching on Supervisor Engine 1. page 14-xvi For information on configuring routing on the MSFC. 2926 Series Switches. “Configuring InterVLAN Routing. 2926G Series. Disable IP MLS on an MSFC interface.Chapter 14 Configuring MLS Configuring MLS IPX MLS and Maximum Transmission Unit Size In IPX. see Chapter 12. Disable IPX MLS on an MSFC interface. page 14-xxviii Configuring Unicast MLS on the MSFC These sections describe how to configure MLS on the MSFC: • • • • Disabling and Enabling Unicast MLS on an MSFC Interface. Configuring MLS These sections describe how to configure MLS: • • • Configuring Unicast MLS on the MSFC. page 14-xvii Configuring IP MMLS. Refer to the Layer 3 Switching Configuration Guide—Catalyst 5000 Family.

perform this task: Task Display MLS status. perform this task: Task Specify an MSFC interface. To enable unicast IP or IPX MLS on a specific MSFC interface. Command Router(config)# interface vlan-id Router(config-if)# mls ipx Enable IP MLS on an MSFC interface. Command show mls status This example shows how to display MLS status on the MSFC: Router# show mls status MLS global configuration status: global mls ip: global mls ipx: global mls ip multicast: current ip flowmask for unicast: current ipx flowmask for unicast: Router# enabled enabled disabled destination only destination only Catalyst 6000 Family Software Configuration Guide—Releases 6.Chapter 14 Configuring MLS Configuring MLS This example shows how to disable IP MLS on an MSFC interface: Router(config)# interface vlan 100 Router(config-if)# no mls ip Router(config-if)# This example shows how to disable IPX MLS on an MSFC interface: Router(config)# interface vlan 100 Router(config-if)# no mls ipx Router(config-if)# Note Unicast MLS is enabled by default. you only need to enable (or reenable) it if you have previously disabled it. To display MLS information on the MSFC.3 and 6.4 78-13315-02 14-15 . Enable IPX MLS on an MSFC interface. Router(config-if)# mls ip This example shows how to enable IP MLS on an MSFC interface: Router(config)# interface vlan 100 Router(config-if)# mls ip Router(config-if)# This example shows how to enable IPX MLS on an MSFC interface: Router(config)# interface vlan 100 Router(config-if)# mls ipx Router(config-if)# Displaying MLS Information on the MSFC The show mls status command displays MLS details.

Chapter 14 Configuring MLS Configuring MLS Using Debug Commands on the MSFC Table 6 describes MLS-related debug commands that you can use to troubleshoot MLS problems on the MSFC. Turns on all Layer 3 manager debugging messages. Displays errors and warnings in the SCP. Displays bugtrace of ip global purge events. Turns on all SCP debugging messages. Displays Layer 3 manager packets. Table 14-8 SCP Debug Commands Command [no] debug scp async [no] debug scp data [no] debug scp errors [no] debug scp packets [no] debug scp timeouts [no] debug scp all Description Displays trace for asynchronous data in and out of the SCP system. Identifies which switch is switching a particular flow by using MLS explorer packets. Displays packet data in and out of the SCP system. Reports timeouts. Displays packet data trace. Table 14-6 MLS Debug Commands Command [no] debug l3-mgr events [no] debug l3-mgr packets [no] debug l3-mgr global [no] debug l3-mgr all Description Displays Layer 3 manager-related events.4 14-16 78-13315-02 . Turns on IPX-related events for MLS. Table 7 describes MLS-related debug commands that you can use to troubleshoot MLS problems when using the MSFC as an external router for a Catalyst 5000 family switch. Using Debug Commands on the SCP Table 8 describes the Serial Control Protocol (SCP)-related debug commands to troubleshoot the SCP that runs over the Ethernet out-of-band channel (EOBC). Catalyst 6000 Family Software Configuration Guide—Releases 6. Table 14-7 MLS Debug Commands—External Router Function Command [no] debug mls ip [no] debug mls ipx [no] debug mls rp [no] debug mls locator [no] debug mls all Description Turns on IP-related events for MLS. including route purging and changes of access lists and flow masks. Turns on all MLS debugging events. including route purging and changes of access lists and flow masks.3 and 6. Turns on route processor-related events.

3 and 6. page 14-xxii Clearing MLS Cache Entries. To disable MLS on the MSFC. For example. page 14-xix Displaying CAM Entries on the Supervisor Engine. Any aging-time value that is not a multiple of 8 seconds is adjusted to the closest multiple of 8 seconds. The default is 256 seconds. page 14-xxvi Displaying IP MLS Statistics. Any MLS entry that has not been used for agingtime seconds is aged out. see the “Disabling and Enabling Unicast MLS on an MSFC Interface” section on page 14-xiv. page 14-xxvi Clearing MLS Statistics. page 14-xx Displaying MLS Information. page 14-xxi Displaying IP MLS Cache Entries. All existing protocol-specific MLS cache entries are purged. a value of 65 is adjusted to 64 and a value of 127 is adjusted to 128. IP or IPX MLS is automatically disabled on Supervisor Engine 1.Chapter 14 Configuring MLS Configuring MLS Configuring MLS on Supervisor Engine 1 MLS is enabled by default on Catalyst 6000 family switches. see the “Configuring Unicast MLS on the MSFC” section on page 14-xiv.” For information on configuring MLS on the MSFC. see Chapter 11. Specifying MLS Aging-Time Value The MLS aging time for each protocol (IP and IPX) applies to all protocol-specific MLS cache entries. page 14-xxviii Displaying MLS Debug Information. page 14-xxviii For information on configuring VLANs on the switch. Note If NDE is enabled and you disable MLS. Note When you disable IP or IPX MLS on the MSFC. page 14-xvii Specifying IP MLS Fast Aging Time and Packet Threshold Values. Catalyst 6000 Family Software Configuration Guide—Releases 6. You can configure the aging time in the range of 8 to 2032 seconds in 8-second increments. page 14-xxvi Clearing IPX MLS Cache Entries. page 14-xviii Setting the Minimum IP MLS Flow Mask. “Configuring VLANs. You only need to configure Supervisor Engine 1 in these circumstances: • • You want to change the MLS aging time You want to enable NDE These sections describe how to configure MLS on Supervisor Engine 1: • • • • • • • • • • • Specifying MLS Aging-Time Value. you will lose the statistics for existing cache entries—they are not exported.4 78-13315-02 14-17 .

4 14-18 78-13315-02 . set mls agingtime [agingtime] This example shows how to specify the MLS aging time: Console> (enable) set mls agingtime 512 Multilayer switching agingtime IP and IPX set to 512 Console> (enable) To specify the IP MLS aging time. IPX MLS only operates in destination-source and destination flow modes. If the number of MLS entries exceeds 32K. Command set mls agingtime ipx [agingtime] This example shows how to specify the IPX MLS aging time: Console> (enable) set mls agingtime ipx 512 Multilayer switching aging time IPX set to 512 Console> (enable) Specifying IP MLS Fast Aging Time and Packet Threshold Values Note IPX MLS does not use fast aging. To help keep the size of the MLS cache down. Catalyst 6000 Family Software Configuration Guide—Releases 6. for IP.3 and 6. as described in the “Specifying IP MLS Fast Aging Time and Packet Threshold Values” section on page 14-xviii. Command set mls agingtime ip [agingtime] This example shows how to specify the IP MLS aging time: Console> (enable) set mls agingtime ip 512 Multilayer switching aging time IP set to 512 Console> (enable) To specify the IPX MLS aging time. enable IP MLS fast aging. perform this task in privileged mode: Task Command Specify the MLS aging time for MLS cache entries. the number of IPX MLS entries in the MLS table is low relative to IP MLS entries in full-flow mode.Chapter 14 Configuring MLS Configuring MLS Note We recommend that you keep the size of the MLS cache below 32K entries. perform this task in privileged mode: Task Specify the IPX MLS aging time for an MLS cache entry. perform this task in privileged mode: Task Specify the IP MLS aging time for an MLS cache entry. some flows are sent to the MSFC. To specify the MLS aging time for both IP and IPX. therefore.

This example shows how to set the IP MLS fast aging time to 32 seconds with a packet threshold of 0 packets: Console> (enable) set mls agingtime fast 32 0 Multilayer switching fast aging time set to 32 seconds for entries with no more than 0 packets switched. Detecting and aging out these entries saves space in the MLS cache for other data traffic. the entry might never be used again after it is created.4 78-13315-02 14-19 . see the “Understanding Flow Masks” section on page 14-vi. To set the minimum IP MLS flow mask. then the IP MLS flow mask on the PFC is destination-ip by default. or 63 packets.Chapter 14 Configuring MLS Configuring MLS To keep the MLS cache size below 32K entries. If you need to enable IP MLS fast aging time. A typical cache entry that is removed is the entry for flows to and from a Domain Name Server (DNS) or TFTP server. The IP MLS fast aging time applies to MLS entries that have no more than pkt_threshold packets switched within fastagingtime seconds after they are created. For information on how the different flow masks work. 7. decrease the normal IP MLS aging time. You can configure the pkt_threshold value to 0. enable IP MLS fast aging time. 1. Any fastagingtime value that is not configured exactly as the indicated values is adjusted to the closest one. 15. If the size of the MLS cache continues to grow over 32K entries. Exercise care when using this command. you can force the PFC to use the source-destination-ip flow mask by setting the minimum IP MLS flow mask using the set mls flow destination-source command. 3. 31. The actual flow mask used will be at least of the granularity specified by this command. or 128 seconds. For example. 96. 64. perform this task in privileged mode: Task Command Specify the IP MLS fast aging time and set mls agingtime fast [fastagingtime] [pkt_threshold] packet threshold for an MLS cache entry. initially set the value to 128 seconds. However. Console> (enable) Setting the Minimum IP MLS Flow Mask You can set the minimum granularity of the flow mask for the MLS cache on the PFC. if you do not configure access lists on any MSFC. Command set mls flow {destination | destination-source | full} Catalyst 6000 Family Software Configuration Guide—Releases 6. Caution The set mls flow destination-source command purges all existing shortcuts in the MLS cache and affects the number of active shortcuts on the PFC. Typical values for fastagingtime and pkt_threshold are 32 seconds and 0 packets (no packets switched within 32 seconds after the entry is created). perform this task in privileged mode: Task Set the minimum IP MLS flow mask. If the cache continues to grow over 32K entries. The default fastagingtime value is 0 (no fast aging).3 and 6. decrease the setting until the cache size stays below 32K. To specify the IP MLS fast aging time and packet threshold. You can configure the fastagingtime value to 32.

If you specify a VLAN number. If a VLAN is not specified. only those CAM entries corresponding to that VLAN number are displayed. Console> (enable) Displaying CAM Entries on the Supervisor Engine The show cam command displays the content-addressable memory (CAM) entries associated with a specific MAC address.4 14-20 78-13315-02 .Chapter 14 Configuring MLS Configuring MLS This example shows how to set the minimum IP MLS flow mask to destination-source-ip: Console> (enable) set mls flow destination-source Configured IP flow mask is set to destination-source flow.-----------------192 00-00-0c-07-ac-c0R 192 00-e0-f9-d1-2c-00R Console> Destination-Ports or VCs -----------------------------7/1 7/1 Xtag ---2 2 Status -----H H Catalyst 6000 Family Software Configuration Guide—Releases 6. perform this task: Task Display CAM entries by MAC address.3 and 6. If the MAC address belongs to an MSFC. To display CAM entries.-----------------194 00-e0-f9-d1-2c-00R 193 00-00-0c-07-ac-c1R 193 00-00-0c-07-ac-5dR 202 00-00-0c-07-ac-caR 204 00-e0-f9-d1-2c-00R 195 00-e0-f9-d1-2c-00R 192 00-00-0c-07-ac-c0R 192 00-e0-f9-d1-2c-00R 204 00-00-0c-07-ac-ccR 202 00-e0-f9-d1-2c-00R 194 00-00-0c-07-ac-5eR 196 00-e0-f9-d1-2c-00R 194 00-00-0c-07-ac-c2R 193 00-e0-f9-d1-2c-00R Total Matching CAM Entries Console> Destination-Ports or VCs -----------------------------7/1 7/1 7/1 7/1 7/1 7/1 7/1 7/1 7/1 7/1 7/1 7/1 7/1 7/1 Displayed = 14 Xtag ---2 2 2 2 2 2 2 2 2 2 2 2 2 2 Status -----H H H H H H H H H H H H H H This example shows how to display the CAM entries for a specified VLAN: Console> show cam msfc 192 VLAN Destination MAC ---. an “R” is appended to the MAC address. entries for all VLANs are displayed. Command show cam msfc [vlan] This example shows how to display the CAM entries: Console> show cam msfc VLAN Destination MAC ---.

This example shows how to display IP MLS information and MSFC-specific information: Console> (enable) show mls ip Total Active MLS entries = 0 Total packets switched = 0 IP Multilayer switching enabled IP Multilayer switching aging time = 256 seconds IP Multilayer switching fast aging time = 0 seconds.03 15 1 01-10-29-8a-0c-00 1. 77 00-d0-d3-9c-e3-f4 25 00-10-07-38-29-18 26. Command show mls {ip | ipx} [mod 1] 1.1.---. 17.-----. either 15 (if the MSFC is installed on Supervisor Engine 1 in slot 1) or 16 (if the MSFC is installed on Supervisor Engine 1 in slot 2). perform this task: Task Display general IP or IPX MLS information and MSFC-specific information for all MSFCs. To display protocol-specific MLS information and MSFC-specific information.0.666. 7.15.20.---------------22.4 78-13315-02 14-21 .121 222.14.----------------.3.-------------------52.9.111 00-d0-d3-9c-e3-f4 112 Catalyst 6000 Family Software Configuration Guide—Releases 6.-----.123.8.5.11.56 15 1 00-10-07-38-29-18 2.----------------.10.6.434.19. packet threshold = 0 IP Flow mask: Full Flow Configured flow mask is Destination flow Active IP MLS entries = 0 Netflow Data Export version: 8 Netflow Data Export disabled Netflow Data Export port/host is not configured Total packets exported = 0 MSFC ID Module XTAG MAC Vlans --------------.959 Console> (enable) This example shows how to display IPX MLS information: Console> (enable) show mls ipx IPX Multilayer switching aging time = 256 seconds IPX flow mask is Destination flow IPX max hop is 15 Active IPX MLS entries = 356 IPX MSFC ID Module XTAG MAC Vlans --------------.3 and 6.0.Chapter 14 Configuring MLS Configuring MLS Displaying MLS Information The show mls command displays protocol-specific MLS information and MSFC-specific information.16.66. 12.10.18. The mod keyword specifies the module number of the MSFC.13.4.---.

69.200.19. 12.69.69.99.42 UDP 2049 41636 00-60-70-6c-fc-23 2 SNAP ARPA 5/8 1/1 2345 1234567 09:03:32 09:08:12 Total IP entries: 5 * indicates TCP flow has ended.---.18.42 UDP 2049 41636 00-60-70-6c-fc-23 2 SNAP ARPA 5/8 1/1 2345 1234567 09:03:32 09:08:12 171. see the “Flow Mask Mode and show mls entry Command Output” section on page 14-vii.69.15.42 UDP 2049 41636 00-60-70-6c-fc-23 2 SNAP ARPA 5/8 1/1 2345 1234567 09:03:32 09:08:12 171.69.69.192. Command show mls entry [short | long] This example shows how to display all MLS entries (IP and IPX): Console> (enable) show mls entry short Destination-IP Source-IP Prot DstPrt SrcPrt Destination-Mac Vlan --------------.133 171.192. perform this task in privileged mode: Task Display all MLS entries.-------171.66.-------.1.1.---ESrc EDst SPort DPort Stat-Pkts Stat-Bytes Created LastUsed ---.16.88.69. page 14-xxiii Displaying IPX MLS Entries for a Specific IPX Destination Address.133 171.14.4.-----. 17.133 171.1.1. page 14-xxii Displaying MLS Entries for a Specific IP Destination Address. page 14-xxiii Displaying Entries for a Specific IP Source Address. Catalyst 6000 Family Software Configuration Guide—Releases 6.192.192. 111 00-d0-d3-33-17-8c 112 Console> (enable) Displaying IP MLS Cache Entries These sections describe how to display MLS cache entries on Supervisor Engine 1: • • • • • • Displaying All MLS Entries.4 14-22 78-13315-02 .42 UDP 2049 41636 00-60-70-6c-fc-23 2 SNAP ARPA 5/8 1/1 2345 1234567 09:03:32 09:08:12 171.----.8.---------.20 00-d0-d3-33-17-8c 25 00-10-07-38-22-22 26.Chapter 14 Configuring MLS Configuring MLS 22.5.133 171.--------------. 7.3.----------------.69.77.0.6.69.-----------. Displaying All MLS Entries To display all MLS entries (IP and IPX).3 and 6.69.----.1.-----.9.----.234 171. page 14-xxiv Displaying IPX MLS Entries for a Specific MSFC. page 14-xxiv Displaying Entries for a Specific IP Flow.11. page 14-xxv Note For a description of how the flow mask mode affects the screen displays when showing MLS entries.13.58 16 2 00-10-07-38-22-22 2.192.41 TCP* 6000 59181 00-60-70-6c-fc-22 4 ARPA SNAP 5/8 11/1 3152 347854 09:01:19 09:08:20 171.10.

298a.-------.0.-----.------.Chapter 14 Configuring MLS Configuring MLS Destination-IPX Stat-Pkts Stat-Bytes --------------------------------.0501 12121 323232 401.1.298a.----------------.----------.-----.----------------.1 (Module 16): Total entries:1 Console> (enable) Displaying IPX MLS Entries for a Specific IPX Destination Address To display IPX MLS entries for a specific destination IPX address.0c00 13 00-00-00-00-00-09 26 4/7 Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.20.20.0000.---------.22.0010.7423 30256 31795084 501.-----.-----.0c00 Destination IPX Source IPX net Destination Mac Vlan Port ------------------------.--------------.-------------.20.0000.---. Command show mls entry ip destination [ip_addr] This example shows how to display MLS entries for a specific destination IP address: Console> (enable) show mls entry ip destination 172.----------------.0000.0010.----.4 78-13315-02 14-23 .----------BABE. perform this task in privileged mode: Task Display IPX MLS entries for a specific destination IPX address (net_address. Command show mls entry ipx destination ipx_addr This example shows how to display IPX MLS entries for a specific destination IPX address: Console> (enable) show mls entry ipx destination 3E.node_address).25. perform this task in privileged mode: Task Display MLS entries for the specified destination IP address.---.2451.----MSFC 22.3100.20.3 and 6.----00-a0-c9-0a-89-1d 211 00-a0-24-51-74-23 201 31-00-05-01-00-00 501 00-00-04-01-00-00 401 13/37 14/33 9/37 3/1 Displaying MLS Entries for a Specific IP Destination Address To display MLS entries for a specific destination IP address.14 00-60-70-6c-fc-22 4 ARPA ARPA 5/39 5/40 115 5290 00:12:20 00:00:04 MSFC 172.---.22.00A0.1 (Module 15): 172.27.56 (Module 15): 3E.0000.-------MSFC 172.0001 30230 1510775 201.0000.14/24 Destination-IP Source-IP Prot DstPrt SrcPrt Destination-Mac Vlan EDst ESrc DPort SPort Stat-Pkts Stat-Bytes Uptime Age --------------.0401 4633 38676 Total IPX entries: 4 Console> Source-IPX-net Destination-Mac Vlan Port -------------.

set the src_port and dst_prt to 0 or no flows will display.-----.1 (Module 15): 172.15 Destination-IP Source-IP Prot DstPrt SrcPrt Destination-Mac Vlan EDst ESrc DPort SPort Stat-Pkts Stat-Bytes Uptime Age --------------. This example shows how to display MLS entries for a specific IP flow: Console> (enable) show mls entry ip flow tcp 23 37819 Destination IP Source IP Port DstPrt SrcPrt Destination Mac Vlan Port --------------. To display MLS entries for a specific IP flow (when the flow mask mode is full flow).-----.0.2.2 TCP 37819 Telnet 08-00-20-7a-07-75 10 3/1 Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. dst_port.14 10.--------------.----------------. perform this task in privileged mode: Task Display MLS entries for the specified source IP address.0. perform this task in privileged mode: Task Command Display entries for a specific IP flow (when show mls entry ip flow [protocol src_port dst_port] the flow mask mode is full flow).--------------.----.-----.0.0.---.20.-----.20. udp.2. icmp.------.20.Chapter 14 Configuring MLS Configuring MLS Displaying Entries for a Specific IP Source Address To display MLS entries for a specific source IP address. or protocol is treated as a wildcard and all entries are displayed (unspecified options are treated as wildcards).22.---.15 51.----MSFC 51. A value of zero (0) for src_port.27.1 (Module 16): Total entries:1 Console> (enable) Displaying Entries for a Specific IP Flow The show mls entry ip flow command displays MLS entries for a specific IP flow.15 TCP Telnet 37819 00-e0-4f-15-49-ff 51 ARPA ARPA 5/39 5/40 115 5290 00:12:20 00:00:04 MSFC 172.0. The src_port and dst_port arguments specify the protocol ports if the protocol is TCP or User Datagram Protocol (UDP).3 and 6.-------.-----. or a decimal number for other protocol families. If the protocol selected is not TCP or UDP. The protocol argument can be tcp. Command show mls entry ip source [ip_addr] This example shows how to display MLS entries for a specific source IP address: Console> (enable) show mls entry ip source 10.25.-------MSFC 172.-----.3: 10.---.2.0.----------------.4 14-24 78-13315-02 .0.----------.---------.

0000.----.0000.0000.0000.0000.4 78-13315-02 14-25 .0000.0000.0000.3 and 6.0000.A810 00-00-00-00-a8-10 180964 00:15:52 00:00:00 11.0000.0000.6410 00-00-00-00-64-10 362618 00:15:53 00:00:00 11.-------MSFC 22.0010 00-00-00-00-00-10 362250 00:15:52 00:00:00 11.0000.0000.0000.0000.0000.2B10 00-00-00-00-2b-10 361974 00:15:52 00:00:00 11.6010 00-00-00-00-60-10 362710 00:15:53 00:00:00 11.7910 00-00-00-00-79-10 181378 00:15:54 00:00:00 Console> (enable) Vlan EDst ESrc Port Stat-Pkts ---.1.0000.0000.FE10 00-00-00-00-fe-10 181286 00:15:53 00:00:00 11.56 (Module 15): 11.9A10 00-00-00-00-9a-10 181056 00:15:52 00:00:00 11.0000.1910 00-00-00-00-19-10 362158 00:15:52 00:00:00 11.0000.0000.0000.0000.0109 00-00-00-00-01-09 4432744 00:15:52 00:00:00 11.4F10 00-00-00-00-4f-10 362342 00:15:53 00:00:00 11.---------- 11 11 11 11 11 11 11 11 10 11 11 11 11 11 11 11 11 11 11 11 ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA ARPA 3/11 3/10 - 7869 3934 7871 3935 7873 3936 7875 3937 96364 7877 3938 7879 3939 3940 3941 7883 3941 7885 3942 3943 Catalyst 6000 Family Software Configuration Guide—Releases 6.0000.0000.CC10 00-00-00-00-cc-10 181148 00:15:53 00:00:00 11.3210 00-00-00-00-32-10 362066 00:15:52 00:00:00 11.8310 00-00-00-00-83-10 181102 00:15:52 00:00:00 10.0000.0000.--------------------------.0000.0000. The mod keyword specifies the module number of the MSFC.Chapter 14 Configuring MLS Configuring MLS Displaying IPX MLS Entries for a Specific MSFC To display IPX MLS entries for a specific MSFC.5610 00-00-00-00-56-10 362434 00:15:53 00:00:00 11.0000.-------.E310 00-00-00-00-e3-10 181332 00:15:53 00:00:00 11.0000.---.E710 00-00-00-00-e7-10 181286 00:15:53 00:00:00 11. either 15 (if the MSFC is installed on Supervisor Engine 1 in slot 1) or 16 (if the MSFC is installed on Supervisor Engine 1 in slot 2). perform this task in privileged mode: Task Display IPX MLS entries for a specific MSFC. Command show mls entry ipx mod1 1.0.0000.D510 00-00-00-00-d5-10 181194 00:15:53 00:00:00 11.B110 00-00-00-00-b1-10 181010 00:15:52 00:00:00 11.0000.0000.0000.---.0000.0000.7D10 00-00-00-00-7d-10 181240 00:15:53 00:00:00 11.0000. This example shows how to display IPX MLS entries for a specific MSFC: Console> (enable) show mls entry ipx 15 Destination-IPX Destination-Mac Stat-Bytes Uptime Age ------------------------.0000.0000.

Displaying IP MLS Statistics These sections describe how to display a variety of IP MLS statistics: • • Displaying IP MLS Statistics by Protocol. The destination and source keywords specify the source and destination IPX addresses.20. Command clear mls entry ip [destination ip_addr_spec] [source ip_addr_spec] [flow protocol src_port dst_port] [all] This example shows how to clear MLS entries with destination IP address 172. and TCP destination port 23: Console> (enable) clear mls entry destination 172. set the src_port and dst_port to 0. page 14-xxvii Displaying Statistics for MLS Cache Entries. • To clear an MLS entry. page 14-xxvii Catalyst 6000 Family Software Configuration Guide—Releases 6.22: Console> (enable) clear mls entry ip destination 172.Chapter 14 Configuring MLS Configuring MLS Clearing MLS Cache Entries The clear mls entry command removes specific MLS cache entries. or a decimal number for other protocol families.22. A value of zero (0) for protocol is treated as a wildcard. perform this task in privileged mode: Task Clear an MLS entry.20. icmp. TCP or UDP source and destination port numbers (src_port and dst_port)—If the protocol you specify is TCP or UDP. TCP source port 1652.22 source 172. The all keyword clears all MLS entries.20.20.26. or no entries will clear.113.3 and 6. and entries for all source or destination ports are cleared (unspecified options are treated as wildcards). udp. The destination and source ip_addr_spec can be a full IP address or a subnet address in the format ip_subnet_addr.20.22 MLS IP entry cleared Console> (enable) This example shows how to clear MLS entries with destination IP address 172. ip_addr/subnet_mask. The all keyword clears all MLS entries. specify the source and destination TCP or UDP port numbers. For other protocols. The flow keyword specifies the following additional flow information: • Protocol family (protocol)—Specify tcp.26. The destination and source keywords specify the source and destination IP addresses. or ip_addr/subnet_mask_bits.113 flow tcp 1652 23 MLS IP entry cleared Console> (enable) Clearing IPX MLS Cache Entries The clear mls entry ipx command removes specific IPX MLS cache entries.4 14-26 78-13315-02 .26. and entries for all protocols are cleared (unspecified options are treated as wildcards).22. A value of zero (0) for src_port or dst_port is treated as a wildcard.

--------. FTP. perform this task in privileged mode: Task Command Display IP MLS statistics by protocol (only show mls statistics protocol if IP MLS is in full flow mode).----------MSFC 127.20.-------------Telnet 900 630 FTP 688 2190 WWW 389 42679 SMTP 802 4966 X 142 2487 DNS 1580 52 Others 82 1 Total 6583 53005 Console> (enable) protocol Total Bytes -----------4298 3105 623686 92873 36870 1046 73 801951 Displaying Statistics for MLS Cache Entries The show mls statistics entry command displays IP MLS statistics for MLS cache entries.4 78-13315-02 14-27 .0. A value of zero (0) for src_port or dst_port is treated as a wildcard.-----. To display statistics for MLS cache entries. source IP address.22. To display IP MLS statistics by protocol.14 Last Used Destination IP Source IP Prot DstPrt SrcPrt Stat-Pkts Stat-Bytes --------------. protocol.0. and source and destination ports to see specific MLS cache entries.12: 172. Specify the destination IP address.20. This example shows how to display IP MLS statistics by protocol: Console> (enable) show mls statistics Protocol TotalFlows TotalPackets ---------------.--------------.22. The protocol keyword functions only if the flow mask mode is full flow. If the protocol specified is not TCP or UDP. Command show mls statistics entry ip [destination ip_addr_spec] [source ip_addr_spec] [flow protocol src_port dst_port] This example shows how to display statistics for a particular MLS cache entry: Console> show mls statistics entry ip destination 172.-----.25. If you do not specify an MLS cache entry. Enter the show mls command to see the current flow mask.14 172. and all statistics are displayed (unspecified options are treated as wildcards).10 6 50648 80 3152 347854 Console> Catalyst 6000 Family Software Configuration Guide—Releases 6.---.3 and 6. set the src_port and dst_prt to 0 or no statistics will display. all statistics are shown. and WWW). perform this task in privileged mode: Task Display statistics for MLS cache entries.Chapter 14 Configuring MLS Configuring MLS Displaying IP MLS Statistics by Protocol The show mls statistics protocol command displays IP MLS statistics by protocol (such as Telnet.20.

page 14-xxxiv Configuring IP MMLS on the MSFC These sections describe how to configure the MSFC for IP MMLS: • • • • Enabling IP Multicast Routing Globally. perform this task in privileged mode: Task Clear IP MLS statistics. Command show mls debug Note The show tech-support command displays supervisor engine system information.4 14-28 78-13315-02 . page 14-xxviii Displaying Global IP MMLS Information on the Supervisor Engine. Command clear mls statistics This example shows how to clear IP MLS statistics: Console> (enable) clear mls statistics All mls statistics cleared.Chapter 14 Configuring MLS Configuring MLS Clearing MLS Statistics The clear mls statistics command clears the following statistics: • • Total packets switched (IP and IPX) Total packets exported (for NDE) To clear IP MLS statistics.3 and 6. Use application-specific commands to get more information about particular applications. page 14-xxix Configuring the IP MMLS Global Threshold. Console> (enable) Displaying MLS Debug Information The show mls debug command displays MLS debug information that you can send to your technical support representative for analysis if necessary. perform this task: Task Display MLS debug information that you can send to your technical support representative. page 14-xxix Enabling IP PIM on MSFC Interfaces. page 14-xxx Catalyst 6000 Family Software Configuration Guide—Releases 6. page 14-xxx Enabling IP MMLS on MSFC Interfaces. Configuring IP MMLS These sections describe how to configure IP MMLS: • • Configuring IP MMLS on the MSFC. To display MLS debug information.

com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_c/ipcprt3/index. Router(config-if)# ip pim {dense-mode | sparse-mode | sparse-dense-mode} Catalyst 6000 Family Software Configuration Guide—Releases 6. page 14-xxxi Monitoring IP MMLS on the MSFC.htm Enabling IP Multicast Routing Globally You must enable IP multicast routing globally on the MSFC before you can enable IP MMLS on MSFC interfaces.4 78-13315-02 14-29 . perform this task: Task Command Enable IP PIM on an MSFC interface. 2926G Series. perform this task in global configuration mode: Task Enable IP multicast routing globally.cisco. page 14-xxxi Displaying the IP Multicast Routing Table. refer to the “IP Multicast” section of the Cisco IOS IP and IP Routing Configuration Guide at http://www. Note This section describes how to enable IP multicast routing on the MSFC.” Note You can specify the MSFC as the MLS route processor (MLS-RP) for Catalyst 5000 family switches using MLS. 2926 Series Switches for Catalyst 5000 family switch MLS configuration procedures. To enable IP PIM on an interface. Refer to the Layer 3 Switching Configuration Guide—Catalyst 5000 Family. For more detailed IP multicast configuration information. To enable IP multicast routing globally on the MSFC.3 and 6. page 14-xxxiv Note For information on configuring routing on the MSFC. see Chapter 12. page 14-xxxiii Using Debug Commands on the SCP. page 14-xxxii Using Debug Commands on the IP MMLS MSFC. Command Router(config)# ip multicast-routing This example shows how to enable IP multicast routing globally: Router(config)# ip multicast-routing Router(config)# Enabling IP PIM on MSFC Interfaces You must enable IP PIM on the MSFC interfaces before IP MMLS will function on those interfaces.Chapter 14 Configuring MLS Configuring MLS • • • • • Displaying IP MMLS Interface Information. “Configuring InterVLAN Routing.

To configure the IP MMLS threshold. Perform this task only if you disabled IP MMLS on the interface and you want to reenable it.Chapter 14 Configuring MLS Configuring MLS This example shows how to enable IP PIM on an interface using the default mode (sparse-dense-mode): Router(config-if)# ip pim Router(config-if)# This example shows how to enable IP PIM sparse mode on an interface: Router(config-if)# ip pim sparse-mode Router(config-if)# Configuring the IP MMLS Global Threshold You can configure a global multicast rate threshold. Command Router(config)# [no] mls ip multicast threshold ppsec This example shows how to configure the IP MMLS threshold to 10 packets per second: Router(config)# mls ip multicast threshold 10 Router(config)# Use the no keyword to deconfigure the threshold. Command Router(config-if)# [no] mls ip multicast This example shows how to enable IP MMLS on an MSFC interface: Router(config-if)# mls ip multicast Router(config-if)# Use the no keyword to disable IP MMLS on an MSFC interface. perform this task: Task Enable IP MMLS on an MSFC interface. To enable IP MMLS on an MSFC interface. Enabling IP MMLS on MSFC Interfaces IP MMLS is enabled by default on the MSFC interface when you enable IP PIM on the interface. To apply the threshold to existing routes. specified in packets per second.3 and 6.4 14-30 78-13315-02 . This prevents creation of MLS entries for short-lived multicast flows.G) multicast traffic is routed by the MSFC. clear the route and let it reestablish. For information on configuring IP PIM on MSFC interfaces. Note This command does not affect flows that are already being routed. perform this task: Task Configure the IP MMLS threshold. below which all (S. see the “Enabling IP PIM on MSFC Interfaces” section on page 14-xxix. Note You must enable IP PIM on all participating MSFC interfaces before IP MMLS will function. Catalyst 6000 Family Software Configuration Guide—Releases 6. such as join requests.

3 and 6. 00:00:19/00:02:41. Next-Hop or VCD.1). The show ip interface command displays the IP MMLS enable state on an MSFC interface. RPF nbr 80.Join SPT M .10. RPF-MFD Outgoing interface list: Vlan10. flags:SJ Incoming interface:Vlan800. 239. Command Router# show ip pim interface [type number] count Router# show ip interface Displaying the IP Multicast Routing Table The show ip mroute command displays the IP multicast routing table on the MSFC. 239.2 Outgoing interface list: Vlan10.252.0.Dense. T .252. RP 80.Local.Chapter 14 Configuring MLS Configuring MLS Displaying IP MMLS Interface Information The show ip pim interface count command displays the IP MMLS enable state on MSFC IP PIM interfaces and the number of packets received and sent on the interface.1).2. State/Mode (*.Hardware switched Timers:Uptime/Expires Interface state:Interface. H (22.2. flags:JT Incoming interface:Vlan800.0. perform one of these tasks: Task Display IP MMLS interface information. S .0. 00:00:19/00:00:00.0. Display the IP MMLS interface enable state.Advertised via MSDP Outgoing interface flags:H .MSDP created entry.0.0.Sparse.252. J . 01:29:57/00:00:00.1. L .252. X . To display IP MMLS information for an IP PIM MSFC interface. To display the IP multicast routing table.Proxy Join Timer Running A .4 78-13315-02 14-31 . Forward/Dense. Forward/Dense.1.Register flag.1.SPT-bit set.1. C . P . Command Router# show ip mroute [group[source]] | [summary] | [count] | [active kbps] This example shows how to display the IP multicast routing table for 239.RP-bit set. perform this task: Task Display the IP multicast routing table. H Catalyst 6000 Family Software Configuration Guide—Releases 6.Pruned R .1: Router# show ip mroute 239. RPF nbr 80.1 IP Multicast Routing Table Flags:D . F . 04:04:59/00:02:59.0.Connected.0.

4 14-32 78-13315-02 . Router IP:1. Display IP MMLS source information.234 MLS multicast operating state:ACTIVE Maximum number of allowed outstanding messages:1 Maximum size reached from feQ:1 Feature Notification sent:5 Feature Notification Ack received:4 Unsolicited Feature Notification received:0 MSM sent:33 MSM ACK received:33 Delete notifications received:1 Flow Statistics messages received:248 MLS Multicast statistics: Flow install Ack:9 Flow install Nack:0 Flow update Ack:2 Flow update Nack:0 Flow delete Ack:0 Complete flow install Ack:10 Complete flow install Nack:0 Complete flow delete Ack:1 Input VLAN delete Ack:4 Output VLAN delete Ack:0 Group delete sent:0 Group delete Ack:0 Global delete sent:7 Global delete Ack:7 L2 entry not found error:0 Generic error :3 LTL entry not found error:0 MET entry not found error:0 L3 entry exists error :0 Hash collision error :0 L3 entry not found error:0 Complete flow exists error :0 Catalyst 6000 Family Software Configuration Guide—Releases 6. To display detailed IP MMLS information on the MSFC. Command Router# show mls ip multicast group group-address [interface type number | statistics] Router# show mls ip multicast interface type number [statistics | summary] Router# show mls ip multicast summary Router# show mls ip multicast statistics Router# show mls ip multicast source ip-address [interface type number | statistics] This example shows how to display IP MMLS statistics on the MSFC: Router# show mls ip multicast statistics MLS Multicast configuration and state: Router Mac:0050. perform one of these tasks: Task Display IP MMLS group information. Display a summary of IP MMLS information.12.9bfd.Chapter 14 Configuring MLS Configuring MLS Monitoring IP MMLS on the MSFC The show mls ip multicast command displays detailed information about IP MMLS. Display IP MMLS statistics.0f2d.123. Display IP MMLS details for all interfaces.3 and 6.

12.1.1. Turns on MDSS 1 error messages.1. 224.13. Packets switched: 62010 Hardware switched outgoing interfaces: Vlan20 Vlan9 RFD-MFD installed: Vlan12 (1. Turns on all MDSS messages.11. 224. Packets switched: 61980 Hardware switched outgoing interfaces: Vlan20 Vlan9 RFD-MFD installed: Vlan12 (1.1.1.1.3. Catalyst 6000 Family Software Configuration Guide—Releases 6. Turns on debug messages for multicast MLS-related errors.Chapter 14 Configuring MLS Configuring MLS This example shows how to display information on a specific IP MMLS entry on the MSFC: Router# show mls ip multicast 224.1.11. MDSS = Multicast Distributed Switching Services Description Configures filtering that applies to all other multicast debugging commands. 224. Turns on all IP MMLS messages.1.12.1) Incoming interface: Vlan11.9.1.1.1. Displays IP MMLS messages from/to the hardware switching engine. Packets switched: 61590 Hardware switched outgoing interfaces: Vlan20 Vlan9 RFD-MFD installed: Vlan13 (1.1.1 Multicast hardware switched flows: (1.1) Incoming interface: Vlan11.1.1. 224.1) Incoming interface: Vlan9. Displays IP MMLS events.1.1. Packets switched: 62430 Hardware switched outgoing interfaces: Vlan20 Vlan9 RFD-MFD installed: Vlan11 (1.1.1) Incoming interface: Vlan13.1.4 78-13315-02 14-33 .1) Incoming interface: Vlan12. Table 14-9 IP MMLS Debug Commands Command [no] debug mls ip multicast group group_id group_mask [no] debug mls ip multicast events [no] debug mls ip multicast errors [no] debug mls ip multicast messages [no] debug mls ip multicast all [no] debug mdss error [no] debug mdss events [no] debug mdss all 1. Packets switched: 0 Hardware switched outgoing interfaces: Vlan20 RFD-MFD installed: Vlan9 (1.1.1.3.3. 224.1. 224.3 and 6. Packets switched: 62430 Hardware switched outgoing interfaces: Vlan20 Vlan9 RFD-MFD installed: Vlan11 Total hardware switched installed: 6 Router# This example shows how to display a summary of IP MMLS information on the MSFC: Router# show mls ip multicast summary 7 MMLS entries using 560 bytes of memory Number of partial hardware-switched flows:2 Number of complete hardware-switched flows:5 Router# Using Debug Commands on the IP MMLS MSFC Table 9 describes IP MMLS-related debug troubleshooting commands. Turns on MDSS-related events.1.1.1) Incoming interface: Vlan12.

see the “Configuring IP MMLS on the MSFC” section on page 14-xxviii. Displays errors and warnings in the SCP. page 14-xxxvi Displaying IP MMLS Entries. To display global IP MMLS configuration information. Command show mls multicast Catalyst 6000 Family Software Configuration Guide—Releases 6. Table 14-10 SCP Debug Commands Command [no] debug scp async [no] debug scp data [no] debug scp errors [no] debug scp packets [no] debug scp timeouts [no] debug scp all Description Displays trace for asynchronous data in and out of the SCP system. Note To configure IP MMLS on the MSFC. Displaying Global IP MMLS Information on the Supervisor Engine These sections describe how to configure IP MMLS on Supervisor Engine 1: • • • • Displaying IP MMLS Configuration Information.4 14-34 78-13315-02 .Chapter 14 Configuring MLS Configuring MLS Using Debug Commands on the SCP Table 10 describes the Serial Control Protocol (SCP)-related debug commands to troubleshoot the SCP that runs over the Ethernet out-of-band channel (EOBC). page 14-xxxv Clearing IP MMLS Statistics. page 14-xxxvi Note IP MMLS is permanently enabled on Supervisor Engine 1 and cannot be disabled.3 and 6. page 14-xxxiv Displaying IP MMLS Statistics. Shows packet data trace. Displaying IP MMLS Configuration Information The show mls multicast command displays global IP MMLS configuration information and the state of participating MSFCs. perform this task: Task Display global IP MMLS configuration information. Reports timeouts. Displays packet data in and out of the SCP system. Turns on all SCP debugging messages.

1.Chapter 14 Configuring MLS Configuring MLS This example shows how to display global IP MMLS configuration information: Console> (enable) show mls multicast Admin Status: Enabled Operational Status: Active Configured flow mask is {Destination-source-vlan flow} Active Entries = 10 Router include list : 1.254 ? 00-50-0f-06-3c-a0 Transmit: Delete Notifications: Acknowledgements: Flow Statistics: 23 92 56 Receive: Open Connection Requests: 1 Keep Alive Messages: 72 Shortcut Messages: 19 Shortcut Install TLV: 8 Selective Delete TLV: 4 Group Delete TLV: 0 Update TLV: 3 Input VLAN Delete TLV: 0 Output VLAN Delete TLV: 0 Global Delete TLV: 0 MFD Install TLV: 7 MFD Delete TLV: 0 Router IP Router Name Router MAC ------------------------------------------------------1.5.252 (Active) Console> (enable) Displaying IP MMLS Statistics The show mls multicast statistics command displays IP MMLS statistics for multicast MSFCs.3 and 6.254 (Active) 1.5.9.252 ? 00-10-29-8d-88-01 Transmit: Delete Notifications: Acknowledgements: Flow Statistics: 22 75 22 Catalyst 6000 Family Software Configuration Guide—Releases 6.4 78-13315-02 14-35 . To display IP MMLS statistics for multicast MSFCs. perform this task: Task Display IP multicast MSFC statistics. Command show mls multicast statistics [ip_addr] This example shows how to display IP MMLS statistics for multicast MSFCs: Console (enable) show mls multicast statistics Router IP Router Name Router MAC ------------------------------------------------------1.9.1.1.1.

--------------. perform this task in privileged mode: Task Display information about IP MMLS entries.1.4 14-36 78-13315-02 .1.1.252 224.1.----------.1.1.1.1.5.9.1.Chapter 14 Configuring MLS Configuring MLS Receive: Open Connection Requests: Keep Alive Messages: Shortcut Messages: Shortcut Install TLV: Selective Delete TLV: Group Delete TLV: Update TLV: Input VLAN Delete TLV: Output VLAN Delete TLV: Global Delete TLV: MFD Install TLV: MFD Delete TLV: Console (enable) 1 68 6 4 2 0 0 0 0 0 4 0 Clearing IP MMLS Statistics The clear mls multicast statistics command clears IP MMLS statistics for all participating MSFCs.1.-------1. To clear IP MMLS statistics. You can display entries based on any combination of the participating MSFC.11.1 15870 473220 15759 473670 15810 473220 15840 2761380 82340280 2742066 82418580 2750940 82340280 2756160 20 12 20 11 20 12 20 Catalyst 6000 Family Software Configuration Guide—Releases 6. Command clear mls multicast statistics This example shows how to clear IP MMLS statistics: Console> (enable) clear mls multicast statistics All statistics for the MLS routers in include list are cleared. or the multicast traffic source.1 1.1.1 224.1. To display information about IP MMLS entries.3 1.9.252 1.1.5.5.1.9.3 and 6.1.---------.1.1.12.1.1.1 224.1 1.1 224.1.12. the multicast group address.254 1.254 1.1.1 224.1.254 1.11.1.--------------.1.252 1. Command show mls multicast entry [[[mod] [vlan vlan_id] [group ip_addr] [source ip_addr]] | [all]] This example shows how to display all IP MMLS entries: Console> (enable) show mls multicast entry all Router IP Dest IP Source IP Pkts Bytes InVlan OutVlans --------------. the VLAN.1 1.1 224. perform this task in privileged mode: Task Clear IP MMLS statistics.252 1.3 1.3 1.1 1.1.1 224.1. Console> (enable) Displaying IP MMLS Entries The show mls multicast entry command displays a variety of information about the multicast flows being handled by the PFC.11.------.1.12.5.13.1.

1 1.-------1.5.3 171.1.252 source 1.11.1.20.1 226.1 short Router IP Dest IP Source IP Pkts Bytes InVlan OutVlans --------------.1.1.5.3 short Source IP InVlan Pkts Bytes OutVlans -----------.------.1 226.37 172.----------.1.1.3.252 224.1.1.1.11.1 1.252 224.--------------.11.4 78-13315-02 14-37 .1.20.159 224.3 472770 15840 473667 82261980 2756160 82418058 13 20 11 This example shows how to display IP MMLS entries for a specific MSFC: Console> (enable) show mls multicast entry 15 Router IP Dest IP Source IP Pkts Bytes InVlan OutVlans --------------.69.1 1.---------.1 1.45 172.11.71 1.1.--------------.1.8 20 171 23512 10.1.1.159 224.19 Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.1.20 This example shows how to display IP MMLS entries for a specific MSFC and a specific multicast source address: Console> (enable) show mls multicast entry 15 1.1.40.22.13.1.---------172.1 15870 15759 15810 15840 15840 2761380 2742066 2750940 2756160 2756160 20 20 20 20 20 This example shows how to display IP MMLS entries for a specific multicast group address: Console> (enable) show mls Router IP Dest IP -------------.1.2 99 65142 22 30.159 224.5.6 1.1.254 224.1.9 12 25 3120 8.1 1.20.1.1.------------------------.Chapter 14 Configuring MLS Configuring MLS 1.12.-----.9.1.0.8 1.1.--------172.13.252 224.5.1.1.1.5.0.-----.22.4.1.3 Total Entries: 2 Console> (enable) multicast entry group 226.----------171.1.49.1 Total Entries: 5 Console> (enable) 1.0.49.1 1.--------------.1.1.2 396 235620 22 13.1.2.2.12.1.1.9.3 1.1.4 368 57776 40 23.25 172.1.1 1.252 224.1.1 1.5.12.1 1.1.3 1.1.201.1.---------.1.--------------.49.2.22.1 1.252 224.69.1.3.254 224.5.1.1.1.252 224.1 Total Entries: 10 Console> (enable) 1.--------.1.

3 and 6.4 14-38 78-13315-02 .Chapter 14 Configuring MLS Configuring MLS Catalyst 6000 Family Software Configuration Guide—Releases 6.

Note For complete syntax and usage information for the commands used in this chapter. You can use NDE to monitor all Layer 3-switched traffic through the Multilayer Switch Feature Card (MSFC).4 78-13315-02 15-1 . page 15-i Default NDE Configuration. page 15-iii Understanding How NDE Works These sections describe how NDE works: • • • Overview of NDE and Integrated Layer 3 Switching Management. This chapter consists of these sections: • • • Understanding How NDE Works. page 15-i Traffic Statistics Data Collection.C H A P T E R 15 Configuring NDE This chapter describes how to configure NetFlow Data Export (NDE) on the Catalyst 6000 family switches. page 15-iii Overview of NDE and Integrated Layer 3 Switching Management Catalyst 6000 family switches provide Layer 3 switching with Cisco Express Forwarding for Policy Feature Card 2 (CEF for PFC2) or with Multilayer Switching (MLS). refer to the Catalyst 6000 Family Command Reference publication. Note NDE version 7 and NDE version 8 are not supported for the MSFC. Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6. Note NDE is not supported for IP multicast or Internetwork Packet Exchange (IPX) traffic. NDE complements the embedded Remote Monitoring (RMON) capabilities on the switch that allow you to see all port traffic. page 15-ii Using NDE Filters. page 15-iii Configuring NDE.

see Chapter 13. Flow collectors.” Integrated Layer 3-switching management includes products. or NetFlow Analyzer. This flow information is then aggregated and fed to applications such as TrafficDirector. and partner applications designed to gather flow statistics. export the statistics. “Configuring CEF for PFC2 and PFC3. and forward them to applications for traffic monitoring.4 15-2 78-13315-02 . collect and perform data reduction on the exported statistics. which consists of a header and a series of flow entries. gather and classify flows.” For information on configuring MLS. management utilities. and accounting. Traffic Statistics Data Collection An external data collector gathers flow entries from the statistics cache of one or more switches or Cisco routers. NetSys.Chapter 15 Understanding How NDE Works Configuring NDE Note For information on configuring CEF for PFC2. The switch or router transmits data to the flow collector by grouping flow entries for expired flows from its statistics cache into a User Datagram Protocol (UDP) datagram. Figure 15-1 Integrated Layer 3 Switching Management Network planning Routers Accounting/Billing Switches Flow profiling RMON Probe Flow switching and data export Flow collection Flow consolidation Network monitoring Flow consumers 10699 Catalyst 6000 Family Software Configuration Guide—Releases 6. “Configuring MLS.3 and 6. planning. see Chapter 14. such as the Cisco SwitchProbe and NetFlow FlowCollector. See Figure 1.

15/32 Netflow data export: source filter set to 10. Console> (enable) set mls nde flow destination 9.1. all expired flows are exported until you specify a filter. If the flow mask is destination-ip mode and the NDE filter contains a filter on both source and destination.15 is not effective (it is ignored).Chapter 15 Configuring NDE Default NDE Configuration Using NDE Filters By default.15 are exported. page 15-iv Specifying an NDE Collector. page 15-vi Specifying a Destination and Source Subnet Filter.2.2. page 15-vi Specifying a Destination Host Filter.3 and 6.4 78-13315-02 15-3 .1. page 15-viii Catalyst 6000 Family Software Configuration Guide—Releases 6.1.1. in the filter specified in the following display if the flow mask is in destination-ip mode.1. page 15-v Enabling NDE.15/32 source 10.15/32 Console> (enable) Default NDE Configuration Table 1 shows the default NDE configuration. Table 15-1 Default NDE Configuration Feature NDE NDE data collector address and UDP port NDE filters Default Value Disabled None specified None configured Configuring NDE These sections describe how to configure NDE: • • • • • • • • • • • • Usage Guidelines. all flows with destination address 9. page 15-viii Removing Protocols for Statistics Collection. only the destination filter is effective. The source filter for host 10.1.2. page 15-vii Specifying a Protocol Filter. page 15-vi Specifying a Destination TCP/UDP Port Filter. After specifying a filter. Filter values are stored in NVRAM and are not cleared when NDE is disabled. page 15-vii Specifying a Source Host and Destination TCP/UDP Port Filter.2. page 15-v Specifying an NDE Source Address on the MSFC. page 15-viii Specifying Protocols for Statistics Collection. only expired and purged flows matching the specified filter criteria are exported. For example.2. page 15-iv Specifying an NDE Destination Address on the MSFC.2.15/32 Netflow data export: destination filter set to 9.

Some query protocols. • • • • Specifying an NDE Collector Before enabling NDE for the first time. This file is located at /opt/csconfc/config/nfconfig. For information on how to change the MLS aging time.” Use the correct flow mask. “Configuring MLS. “Configuring MLS. see the “Specifying IP MLS Long-Duration Aging Time.” If there are protocols with fewer packets per flow running. Keep specific flows from being added to the Netflow table with the set mls nde flow exclude command. and Packet Threshold Values” section on page 14-18 in Chapter 14. like Domain Name System (DNS). see the “Specifying MLS Aging-Time Value” section on page 14-17 in Chapter 14. Command set mls nde {collector_ip | collector_name} {udp_port_number} Catalyst 6000 Family Software Configuration Guide—Releases 6. page 15-ix Displaying the NDE Configuration.” Exclude entries with fewer packets per flow.file in the FlowCollector application. generate fewer packets per flow and can be excluded from the NetFlow table with the set mls exclude protocol command. page 15-ix Disabling NDE.4 15-4 78-13315-02 . but packets from filtered protocols will go to the MSFC. the load on the Layer 3 aging also increases. Set the aging time high enough to keep the number of entries within the 32k-flow range of the PFC. With a full flow mask. Fast Aging Time. you must specify an NDE collector and UDP port to receive the exported statistics. Use the flow mask required to extract the kind of information you want.Chapter 15 Configuring NDE Configuring NDE • • • • Clearing the NDE Flow Filter. The collector address and UDP port number are saved in NVRAM and are preserved if NDE is disabled and reenabled or if the switch is power cycled. perform this task in privileged mode: Task Specify an NDE collector and UDP port for data export of hardware-switched packets. You can specify up to four protocol filters. “Configuring MLS.file. Note If you are using the NetFlow FlowCollector application for data collection. For information on how to change the MLS fast aging time. you might need to decrease the MLS aging time because a full flow mask increases the number of flows per second.3 and 6. A full flow mask gives more information but as the number of flows increase. For information on setting the flow mask. page 15-x Usage Guidelines If too many entries are added to the NetFlow table. page 15-ix Removing the NDE IP Address. To specify an NDE collector. Try to use a flow mask with the minimum granularity required to get the data you need. follow these guidelines: • Reduce the MLS aging time. verify that the UDP port number you specify is the same port number shown in the FlowCollector’s nfconfig. reduce the MLS fast aging time. see the “Setting the Minimum IP MLS Flow Mask” section on page 14-19 in Chapter 14.

the MSFC and PFC automatically use the IP address of one of the MSFC VLAN interfaces.1(Stargate) Console> (enable) Specifying an NDE Destination Address on the MSFC To monitor data and statistics about Layer 3 traffic that is switched in software by the MSFC. you must specify the NDE collector and UDP port on the MSFC by entering the ip flow-export destination command on the MSFC.15. peform this task in privileged mode: Task Specify an NDE source address for data export of software-switched packets.4 78-13315-02 15-5 . Netflow data export to port 9996 on 172. You configure the source address on the MSFC so the data collection application can aggregate export data from both the MSFC and the PFC for the same flow by entering the ip flow-export source vlan command on the MSFC.3 and 6. Command ip flow-export destination {hostname | ip_address} {udp_port_number} This example shows how to specify the NDE collector from the MSFC: Router(config)# ip flow-export destination Stargate 9996 Router(config)# Specifying an NDE Source Address on the MSFC The MSFC and the PFC use the NDE source address when sending statistics to the data collection application. To specify the NDE collector for Layer 3 traffic that is being switched by the MSFC.20. Command ip flow-export source vlan {vlan_interface_number} This example shows how to specify the NDE source address on the MSFC: Router(config)# ip flow-export source vlan 10 Router(config)# Catalyst 6000 Family Software Configuration Guide—Releases 6. To specify the NDE source address for Layer 3 traffic that is being switched by the MSFC. peform this task in privileged mode: Task Specify an NDE collector and UDP port for data export of software-switched packets. Note The ip flow-export source vlan command is optional. If you do not specify an NDE source address on the MSFC.Chapter 15 Configuring NDE Configuring NDE This example shows how to specify an NDE collector: Console> (enable) set mls nde Stargate 9996 Netflow data export not enabled.

Netflow data export to port 9996 on 172.194. perform this task in privileged mode: Task Specify a destination host filter for an NDE flow. perform this task in privileged mode: Task Specify a destination and source subnet filter for an NDE flow.69.Chapter 15 Configuring NDE Configuring NDE Enabling NDE To enable NDE.140 Netflow Data Export successfully set Destination filter is 171.15.140 are exported: Console> (enable) set mls nde flow destination 171. perform this task in privileged mode: Task Enable NDE on the switch.194.69.1 (Stargate) Console> (enable) If you attempt to enable NDE without first specifying a collector.255.69.4 15-6 78-13315-02 . Command set mls nde flow destination [ip_addr_spec] This example shows how to specify a destination host filter so that only expired flows to host 171.194.255 Filter type: include Console> (enable) Specifying a Destination and Source Subnet Filter To specify a destination and source subnet filter.140/255.3 and 6.255. Command set mls nde flow destination [ip_addr_spec] source [ip_addr_spec] Catalyst 6000 Family Software Configuration Guide—Releases 6. you see this display: Console> (enable) set mls nde enable Please set host name and UDP port number with ‘set mls nde <collector_ip> <udp_port_number>’.20. Command set mls nde enable This example shows how to enable NDE on the switch: Console> (enable) set mls nde enable Netflow data export enabled. Console> (enable) Specifying a Destination Host Filter To specify a destination host filter.

255 Destination port filter is 23 Filter type: include Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.255.69.194.5/24 Netflow Data Export successfully set Source filter is 171.173.69.140/24 source 171.194.69. Command set mls nde flow dst_prt [port_number] This example shows how to specify a destination TCP/UDP port filter so that only expired flows to destination port 23 are exported (assuming the flow mask is set to ip-flow): Console> (enable) set mls nde flow dst_port 23 Netflow Data Export successfully set Destination port filter is 23 Filter type: include Console> (enable) Specifying a Source Host and Destination TCP/UDP Port Filter To specify a source host and destination TCP/UDP port filter. perform this task in privileged mode: Task Specify a destination TCP/UDP port filter for an NDE flow.3 and 6.194.255.140 to destination port 23 are exported (assuming the flow mask is set to ip-flow): Console> (enable) set mls nde flow source 171.173.69. Command set mls nde flow source [ip_addr_spec] dst_prt [port_number] This example shows how to specify a source host and destination TCP/UDP port filter so that only expired flows from host 171.69.140 dst_port 23 Netflow Data Export successfully set Source filter is 171.69.194.173.4 78-13315-02 15-7 .0/24 Filter type: include Console> (enable) Specifying a Destination TCP/UDP Port Filter To specify a destination TCP/UDP port filter.140/255. perform this task in privileged mode: Task Specify a source host and destination TCP/UDP port filter for an NDE flow.69.194.69.Chapter 15 Configuring NDE Configuring NDE This example shows how to specify a destination and source subnet filter so that only expired flows to subnet 171.69.0 from subnet 171.0 are exported (assuming the flow mask is set to source-destination-ip): Console> (enable) set mls nde flow destination 171.0/24 Destination filter is 171.194.

3 and 6. The port argument specifies the protocol port. perform this task in privileged mode: Task Remove protocols for statistics collection. Command clear mls statistics protocol {protocol port | all} Catalyst 6000 Family Software Configuration Guide—Releases 6.Chapter 15 Configuring NDE Configuring NDE Specifying a Protocol Filter To specify a protocol filter. icmp. To specify protocols for statistics collection.4 15-8 78-13315-02 . udp. Console> (enable) Removing Protocols for Statistics Collection You can enter the clear mls statistics protocol {protocol port | all} command to specify up to 64 different protocols for which to collect statistics to be exported using NDE. Use the all keyword to remove all protocols for statistics collection. perform this task in privileged mode: Task Specify protocols for statistics collection. tcp. igmp. icmp. The protocol argument can be tcp. Protocol filter is 17 Filter type: include Console> (enable) Specifying Protocols for Statistics Collection You can enter the set mls statistics protocol protocol port command to specify up to 64 different protocols for which to collect statistics to be exported using NDE. To remove protocols for statistics collection. The protocol argument can be ip. Command set mls statistics protocol protocol port This example shows how to specify a protocol for statistics collection: Console> (enable) set mls statistics protocol 17 1934 Protocol 17 port 1934 is added to protocol statistics list. perform this task in privileged mode: Task Specify a protocol filter for an NDE flow. Command set mls nde flow protocol protocol This example shows how to specify a protocol filter so that only expired flows from protocol 17 are exported: Console> (enable) set mls nde flow protocol 17 Netflow Data Export filter successfully set. or a decimal number for other protocol families. ipinip. and udp. or a decimal number for other protocol families. The port argument specifies the protocol port.

perform this task in privileged mode: Task Disable NDE on the switch. Console> (enable) Disabling NDE Note With Supervisor Engine 1 and a PFC.3 and 6. Command set mls nde disable This example shows how to disable NDE on the switch: Console> (enable) set mls nde disable Netflow data export disabled. perform this task in privileged mode: Task Clear the NDE flow filter. Console> (enable) Clearing the NDE Flow Filter To clear the NDE flow filter and reset the filter to the default (all flows exported). if NDE is enabled and you disable MLS.Chapter 15 Configuring NDE Configuring NDE This example shows how to remove a protocol for statistics collection: Console> (enable) clear mls statistics protocol 17 1934 Protocol 17 port 1934 cleared from protocol statistics list. Command clear mls nde flow This example shows how to clear the NDE flow filter so that all flows are exported: Console> (enable) clear mls nde flow Netflow data export filter cleared. To disable NDE on the switch. Command Router(config)# no mls nde-address [ip_addr] Catalyst 6000 Family Software Configuration Guide—Releases 6.4 78-13315-02 15-9 . perform this task in global configuration mode: Task Remove the NDE IP address from the MSFC. you lose the statistics for existing cache entries—they are not exported. Console> (enable) Removing the NDE IP Address To remove the NDE IP address from the MSFC.

170.2.194.4 15-10 78-13315-02 .255.0 Destination port filter is 23 Total packets exported = 26784 Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.140/255.20. Command show mls nde This example shows how to display the NDE configuration on the switch: Console> (enable) show mls nde Netflow Data Export enabled Netflow Data Export configured for port 1098 on host 172.Chapter 15 Configuring NDE Configuring NDE This example shows how to remove the NDE IP addresses from the MSFC: Router(config)# no mls nde-address 170. perform this task in privileged mode: Task Display the NDE configuration on the switch.15.1 Source filter is 171.1 Router(config)# Displaying the NDE Configuration To display the NDE configuration on the switch.255.69.3 and 6.

C H A P T E R 16 Configuring Access Control This chapter describes how to configure access control lists (ACLs) on the Catalyst 6000 family switches. page 16-xxiii Unsupported Features. Note For complete syntax and usage information for the commands used in this chapter. page 16-ii Supported ACLs. Understanding How ACLs Work Traditionally. page 16-xliii Configuring Policy-Based Forwarding. See the “Hardware Requirements” section on page 16-ii for details. the information and procedures in this chapter apply to both Supervisor Engine 2 with Layer 3 Switching Engine II (Policy Feature Card 2 or PFC2) and Supervisor Engine 1 with Layer 3 Switching Engine II (Policy Feature Card or PFC). Configuration of the ACLs depends on the type of hardware you install on your supervisor engine. This chapter consists of these sections: • • • • • • • • • • • Understanding How ACLs Work. switches operated at Layer 2 only. page 16-x Using VACLs with Cisco IOS ACLs. page 16-ii Hardware Requirements. switches switched traffic within a VLAN and routers routed traffic between VLANs. page 16-xvi Using VACLs in your Network. page 16-ii Applying Cisco IOS ACLs and VACLs on VLANs.3 and 6. page 16-xxviii Configuring VACLs.4 78-13315-02 16-1 . page 16-xxix Configuring and Storing VACLs and QoS ACLs in Flash Memory. page 16-xlviii Note Except where specifically differentiated. refer to the Catalyst 6000 Family Command Reference publication. page 16-viii Using Cisco IOS ACLs in your Network. Catalyst 6000 family switches with the Multilayer Switch Feature Card (MSFC) can accelerate packet routing between VLANs by using Layer 3 switching (Multilayer Catalyst 6000 Family Software Configuration Guide—Releases 6.

Packets can either enter the VLAN through a switch port or through a router port after being routed. VACLs can provide access control based on Layer 3 addresses for IP and IPX protocols. See Chapter 41.4 16-2 78-13315-02 . Classified packets can be subject to a number of features such as access control (security). During this process. and VLAN ACLs (VACLs) provide access control for all packets. Unsupported protocols are access controlled through MAC addresses. Supported ACLs These sections describe the ACLs supported by the Catalyst 6000 family switches: • • • QoS ACLs. Standard and extended Cisco IOS ACLs are only configured on router interfaces and applied on routed packets. “Configuring QoS. and then the packet is bridged again to send it to its destination. page 16-iii QoS ACLs You can configure QoS ACLs on the switch. A VACL is applied to all packets (bridged and routed) and can be configured on any VLAN interface. page 16-iii Cisco IOS ACLs. the packet is then routed internally without going to the router. encryption. page 16-iii VACLs. policy-based routing. the switch can access control all packets it switches. “Configuring QoS” for more information. all packets (routed or bridged) entering the VLAN are checked against the VACL. including packets bridged within a VLAN. and so on. The switch first bridges the packet.Chapter 16 Hardware Requirements Configuring Access Control Switching [MLS]). Once a VACL is configured on a VLAN. Cisco IOS ACLs provide access control for routed traffic between VLANs. Hardware Requirements The hardware that is required to configure ACLs on Catalyst 6000 family switches is as follows: • Cisco IOS ACLs: – Policy Feature Card (PFC) and MSFC or MSFC2 – PFC2 and MSFC2 • VACLs and QoS ACLs: – PFC – PFC2 Note The QoS feature set supported on your switch is determined by which switching engine daughter card is installed on the supervisor engine. see Chapter 41. Standard and extended Cisco IOS ACLs are used to classify packets.” Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.

extended. TCP intercept uses a global ACL that is applied on all interfaces for outbound direction. Many other features in Cisco IOS software also use ACLs for specifying flows. One Cisco IOS ACL can be used with multiple features for a given interface. However. ACLs are applied on all interfaces for a given direction.Chapter 16 Configuring Access Control Supported ACLs Cisco IOS ACLs Cisco IOS ACLs are configured on the MSFC VLAN interfaces. Cisco IOS software examines it multiple times. VACLs are strictly for security packet filtering and redirecting traffic to specific physical switch ports. and/or reflexive) Encryption ACLs (not supported on the MSFC) NAT ACLs (for inside-to-outside translation) WCCP ACL TCP intercept ACL VACLs The following sections describe VACLs: • • • VACL Overview. Web Cache Redirect (through the Web Cache Coordination Protocol [WCCP]) uses ACLs to specify HTTP flows that can be redirected to a Web cache engine. and/or reflexive) Encryption ACLs (not supported on the MSFC) Policy routing ACLs Network Address Translation (NAT) for outside-to-inside translation After packets are routed and before they are forwarded out to the next hop. page 16-iv ACEs Supported in VACLs. An ACL provides access control and consists of an ordered set of access control entries (ACEs). Catalyst 6000 Family Software Configuration Guide—Releases 6.4 78-13315-02 16-3 . As packets enter the router on a given interface. Cisco IOS software examines ACLs that are associated with features that are configured on a given interface and a direction. some features use ACLs globally.3 and 6. For example. Unlike Cisco IOS ACLs. Most Cisco IOS features are applied on interfaces for specific directions (inbound versus outbound). Cisco IOS software examines ACLs that are associated with all inbound features that are configured on that interface for the following: • • • • Inbound access control ACLs (standard. As an example. Cisco IOS examines all ACLs that are associated with the outbound features that are configured on the egress interface for the following: • • • • • Outbound access control ACLs (standard. page 16-iv Handling Fragmented and Unfragmented Traffic. page 16-v VACL Overview VACLs can access control all traffic. When a single ACL is used by multiple features. and one feature can use multiple ACLs. extended. VACLs are not defined by direction (input or output). You can configure VACLs on the switch to apply to all packets that are routed into or out of a VLAN or are bridged within a VLAN. For such features.

DECnet. Caution IP traffic and IPX traffic are not access controlled by MAC VACLs. All other protocols are access controlled through MAC addresses and Ethertype using MAC VACLs. The action is feature dependent.4 16-4 78-13315-02 . An action is associated with each ACE that describes what the system should do with the packet when a match occurs. All other traffic types (AppleTalk. Each ACE contains a number of fields that are matched against the contents of a packet. you cannot enforce VACLs on traffic between hosts on a hub or another switch connected to the Catalyst 6000 family switch.Chapter 16 Supported ACLs Configuring Access Control You can configure VACLs on Layer 3 addresses for IP and IPX. Each field can have an associated bit mask to indicate which bits are relevant. ACEs Supported in VACLs A VACL contains an ordered list of access control entries (ACEs). Catalyst 6000 family switches support three types of ACEs in the hardware: • • • IP ACEs IPX ACEs Ethernet ACEs Table 1 lists the parameters associated with each ACE type. Table 16-1 ACE Types and Parameters ACE Type Layer 4 parameters TCP or UDP1 Source port Source port operator Destination port Destination port operator N/A ICMP1 Other IP1 IPX Ethernet2 ICMP code1 ICMP type IP ToS byte IP source address IP destination address N/A IP ToS byte IP source address IP destination address IPX source network IPX destination network IPX destination node Layer 3 parameters IP ToS byte IP source address IP destination address TCP or UDP ICMP Other protocol IPX packet type Catalyst 6000 Family Software Configuration Guide—Releases 6. You can enforce VACLs only on packets going through the Catalyst 6000 family switch. and so on) are classified as MAC traffic and MAC VACLs are used to access control this traffic.3 and 6. Each VACL can contain ACEs of only one type.

1. the system does not automatically install a global permit statement for fragments. the first fragment hits this entry and is permitted.2. IP ACEs.2..1. there is a fragment option. Handling Fragmented and Unfragmented Traffic TCP/UDP or any Layer 4 protocol traffic.1.1. 2. and the rest of the traffic from port 68 does not hit this entry.1 port 68 is fragmented. the behavior is the same as in previous releases.1.2. If you do not specify the fragment keyword.1.255.255 This example shows that the traffic coming from 1.2.2. you can identify fragments and distinguish them from the rest of the TCP/UDP traffic. Layer 4 parameters of ACEs can filter unfragmented traffic and fragmented traffic with fragments that have offset 0.2 eq 34 This example shows that the fragment that has offset 0 of the traffic from 1. If packets are fragmented. This keyword allows you to control how fragments are handled.Chapter 16 Configuring Access Control Supported ACLs Table 16-1 ACE Types and Parameters (continued) ACE Type Layer 2 parameters TCP or UDP1 ICMP1 Other IP1 IPX Ethernet2 Ethertype Ethernet source address Ethernet destination address 1.2 port 34 is permitted. For Ethernet packets that are not IP version 4 or IPX.1 eq 68 host 2.4 78-13315-02 16-5 . The fragments that have an offset other than 0 are permitted as a default.1(1) and later releases. In software release 6..2 port 34 is denied. when fragmented.255. This example shows that if the traffic from 1. IP fragments that have an offset other than 0 miss the Layer 4 port information and cannot be filtered. only the first fragment goes to port 4/3. This situation makes it difficult to enforce security based on the application. permit tcp host 1.2.1. However.3 and 6.1 port 68 going to 2. If you specify the fragment keyword. fragments that have an offset other than 0 are also permitted as a default result for fragments.1.2 eq 34 In releases prior to software release 6.1. the fragment filtering was completely transparent. The following examples show how ACEs handle packet fragmentation. deny tcp host 1.1 eq 68 host 2. Catalyst 6000 Family Software Configuration Guide—Releases 6..1.1(1).1. you would type an ACE such as permit tcp .2. redirect 4/3 tcp host 1. loses the Layer 4 information (Layer 4 source/destination ports).2.1 port 68 and going to 2.1. port eq port_number and the software would implicitly install the following ACE at the top of the ACL: permit tcp any any fragments.1 eq 68 host 255.

1.2 fragment permit tcp any host 10.. 5. all the fragments for TCP traffic are permitted as the permit tcp any any fragments ACE is added automatically at the top of the ACL as follows: permit tcp any any fragments 1. If the entry is a deny statement.2 permit ip any any If you explicitly want to stop fragmented UDP traffic to host 10.1. 1.1..1.1. deny tcp any host 10. 10.2 eq 69 permit udp any gt 1023 10. the deny tcp any host 10.2 fragment entry stops fragmented traffic going to all TCP ports on host 10.Chapter 16 Supported ACLs Configuring Access Control In this example. the permit udp any host 10.3 and 6.1.1..1.1.1.2 eq 69 permit udp any gt 1023 10.1.1.2 eq www there will not be a permit tcp any any fragments ACE added at the top of ACL.] 3.2 eq www permit udp any host 10.2 gt 1023 deny ip any host 10. When you specify the fragment keyword.1.1.] Catalyst 6000 Family Software Configuration Guide—Releases 6.1.2. 4.1.1.1. enter deny udp any host 10.2.1.2 is configured to serve HTTP connections. the software implicitly installs ACEs to permit flows to a specific IP address (or subnet) that you specify.2 fragment permit udp any host 10. If you do not use a fragment ACE.2.1. The system automatically installs a permit for all fragments of udp traffic to host 10.1. 2. permit tcp any host 10.. When you specify the fragment keyword for at least one ACE. Note The deny statements are handled differently for noninitial fragments versus nonfragmented or initial fragments.2 ACE.2 gt 1023 [.1. the system does not install the global permit TCP or UDP fragments statement. 3. 2.1.1.1.2 permit ip any any In the above example if you change entry 1 as follows: 1. In this ACL example. otherwise.1.2 eq 69 entry allows clients to connect to the TFTP server 10. 4.1.1.2 fragment before entry number 3 as shown in this example: [.1.1.1. the next access-list entry is processed.1. deny udp any host 10.1.1. Later in the ACL. 5.1.2.1. 3.4 16-6 78-13315-02 . deny tcp any host 10.1.1. 6. fragments would be denied by the entry deny ip any host 10.1.2 eq www deny ip any host 10.1.

only Layer 2 ACLs are applied to the input VLAN. 2. and multicast packets. page 16-viii Multicast Packets. page 16-ix Bridged Packets Figure 1 shows how an ACL is applied on bridged packets. For routed/Layer 3-switched packets.3 and 6. 3. VACL for input VLAN Input Cisco IOS ACL Output Cisco IOS ACL VACL for output VLAN Catalyst 6000 Family Software Configuration Guide—Releases 6. page 16-viii Routed Packets. the ACLs are applied in the following order: 1. These sections show how ACLs and VACLs are applied: • • • Bridged Packets.4 78-13315-02 26961 Host A (VLAN 10) Catalyst 6500 Series Switch with PFC Host B (VLAN 10) 16-7 . For bridged packets. routed packets. Figure 16-1 Applying ACLs on Bridged Packets VACL Bridged Routed Packets Figure 2 shows how ACLs are applied on routed/Layer 3-switched packets.Chapter 16 Configuring Access Control Applying Cisco IOS ACLs and VACLs on VLANs Applying Cisco IOS ACLs and VACLs on VLANs This section describes how to apply Cisco IOS ACLs and VACLs to the VLAN for bridged packets. 4.

the ACLs are applied in the following order: 1.Chapter 16 Applying Cisco IOS ACLs and VACLs on VLANs Configuring Access Control Figure 16-2 Applying ACLs on Routed Packets Routed Input IOS ACL Bridged VACL Output IOS ACL MSFC VACL Bridged Catalyst 6500 series switches with MSFC Host A (VLAN 10) 26964 Host B (VLAN 20) Multicast Packets Figure 3 shows how ACLs are applied on packets that need multicast expansion. Input Cisco IOS ACL 2. Output Cisco IOS ACL b. VACL for input VLAN b. Packets that need multicast expansion: a. Packets after multicast expansion: a.3 and 6. VACL for output VLAN 3.4 16-8 78-13315-02 . For packets that need multicast expansion. Packets originating from router: a. VACL for output VLAN Catalyst 6000 Family Software Configuration Guide—Releases 6.

the Cisco IOS ACL associated with the feature determines the specific traffic that is bridged to the router instead of being Layer 3 switched.3 and 6. the ACL configurations for Cisco IOS ACLs and VACLs must be the same on both MSFCs. To configure Cisco IOS ACLs. to configure ACLs for IP. Catalyst 6000 Family Software Configuration Guide—Releases 6. When a feature is configured on the router to process traffic (such as NAT). In addition. refer to the Cisco IOS configuration guides and command reference publication. Note that there are some exceptions to this process as described in the “Hardware and Software Handling of Cisco IOS ACLs with PFC” section on page 16-xi. Note In systems with redundant MSFCs.4 78-13315-02 16-9 . refer to the “Configuring IP Services” chapter in the Network Protocols Configuration Guide. The router then applies the feature and routes the packet normally. see the “Unsupported Features” section on page 16-xxviii and the “VACL Configuration Guidelines” section on page 16-xxix.Chapter 16 Configuring Access Control Using Cisco IOS ACLs in your Network Figure 16-3 Applying ACLs on Multicast Packets Catalyst 6500 Series Switch with MSFC Routed Input IOS ACL Bridged VACL MSFC IOS ACL for output VLAN for packets originating from router Output IOS ACL VACL Host B (VLAN 20) Host A (VLAN 10) Bridged Host D (VLAN 20) 26965 Host C (VLAN 10) Using Cisco IOS ACLs in your Network Note Configuring Cisco IOS ACLs on the Catalyst 6000 family switch routed-VLAN interfaces is the same as configuring ACLs on other Cisco routers. Part 1. For example.

These sections describe hardware and software handling of ACLs with PFC and PFC2: • • Hardware and Software Handling of Cisco IOS ACLs with PFC. page 16-xi Hardware and Software Handling of Cisco IOS ACLs with PFC2. page 16-xiii Catalyst 6000 Family Software Configuration Guide—Releases 6. The forwarding rate for software-forwarded flows is substantially less than for hardware-forwarded flows. Note that the ip unreachables command is enabled by default.4 16-10 78-13315-02 . This process significantly degrades system performance. the match count displayed does not account for packets access controlled in the hardware. page 16-xiii Hardware and Software Handling of Cisco IOS ACLs with PFC This section describes hardware and software handling of Cisco IOS ACLs with the PFC. Note For information on Cisco IOS ACLs with PFC2. page 16-xii TCP Intercept. you must disable ICMP unreachables using the no ip unreachables interface configuration command. the MSFC has to process the ACL in the software. To drop access-group denied packets in the hardware. These sections describe how different types of ACLs and traffic flows are handled by the hardware and the software: • • • • • Security Cisco IOS ACLs. These access-group denied packets are not dropped in the hardware but are bridged to the MSFC so that the MSFC can generate the ICMP-unreachable message. the MSFC sends Internet Control Message Protocol (ICMP) unreachables when a packet is denied by an access group. see the “Hardware and Software Handling of Cisco IOS ACLs with PFC2” section on page 16-xiii. page 16-xii Reflexive ACLs. For PFC2: If IP unreachables or IP redirect is enabled on an interface. ACL feature processing requires forwarding of some flows by the software. page 16-xii Policy Routing. page 16-xiii WCCP. Flows that require logging as specified by the ACL are handled in the software without impacting non-log flow forwarding in the hardware. the deny is performed in hardware although a small number of packets are sent to the MSFC2 to generate the appropriate ICMP-unreachable messages.3 and 6. Note When you enter the show ip access-list command. Note IPX Cisco IOS ACLs with the source host node number specified cannot be enforced on the switch in the hardware.Chapter 16 Using Cisco IOS ACLs in your Network Configuring Access Control Caution For PFC: By default.

ACL flows requiring logging are handled in the software without impacting non-log flow forwarding in the hardware. the flow mask is changed to VLAN-full flow. destination network. it is handled in the software. page 16-xiii Unicast RPF Check. destination network. The software continues to intercept and forward packets throughout the duration of the connection. Note that when reflexive ACLs are applied. without impacting other flows. The flows matching a “permit” statement are switched in the hardware. and/or protocol type. IPX extended input and output ACLs are supported in the hardware when the ACL parameters are IPX source network. and if successful. however. Catalyst 6000 Family Software Configuration Guide—Releases 6. In intercept mode. and/or destination node. which are a type of denial-of-service attack.4 78-13315-02 16-11 . If the ACL contains any other parameters. idle timeout is not supported. page 16-xiii Bridge-Groups. Permit and deny actions of standard and extended ACLs (input and output) for security access control are handled in the hardware. IPX standard input and output ACLs are supported in the hardware when the ACL parameters are IPX source network. Dynamic (lock and key) ACL flows are supported in the hardware. IP accounting for an ACL access violation on a given interface is supported by forwarding all denied packets for that interface to the software. the TCP intercept software intercepts TCP synchronization (SYN) packets from clients to servers that match an extended access list.Chapter 16 Configuring Access Control Using Cisco IOS ACLs in your Network • • • NAT. page 16-xiii Security Cisco IOS ACLs The IP and IPX security Cisco IOS ACLs with PFC are as follows: • The flows that match a “deny” statement in a security ACL are dropped by the hardware if “ip unreachables” is disabled.3 and 6. • • • • • • Reflexive ACLs Up to 512 simultaneous reflexive sessions are supported in the hardware. destination node. This process ensures that connection attempts from unreachable hosts never reach the server. The software establishes a connection with the client on behalf of the destination server. TCP Intercept The TCP intercept feature implements software to protect TCP servers from TCP SYN-flooding attacks. The TCP intercept feature helps prevent SYN-flooding attacks by intercepting and validating TCP connection requests. establishes the connection with the server on behalf of the client and binds the two half-connections together transparently.

In the event of DOS attacks. Hardware and Software Handling of Cisco IOS ACLs with PFC2 This section describes hardware and software handling of Cisco IOS ACLs with the PFC2. However. For route maps that only contain match length clauses. NAT NAT-required flows are handled in the software without impacting non-NAT flow forwarding in the hardware. traffic denied by the unicast RPF ACL is forwarded to the MSFC for RPF validation.” all traffic matching the ACL in the “match ip address” clause is forwarded to the software regardless of the match length criteria. HTTP replies from the server and the Cache Engine are handled in the hardware. this could cause high CPU utilization. Unicast RPF Check The unicast RPF feature is supported in hardware on the PFC. packets denied by the ACL are sent to the CPU for RPF validation. policy routing is applied in the hardware for all interfaces regardless of which interface was configured for policy routing.3 and 6. all policy routing occurs in the hardware. When a route map contains multiple “match” clauses. Caution If you use the mls ip pbr command to enable policy routing. Caution With ACL-based unicast RPF. Bridge-Groups Cisco IOS bridge-group ACLs are handled in the software. When you enable hardware policy routing using the mls ip pbr global command. Note Drop-suppress statistics for ACL-based RPF check is not supported. for route maps containing both “match ip address” and “match length. Under heavy traffic conditions. all packets received on the interface are forwarded to the software. these packets will most likely match the deny ACE and be forwarded to the CPU.4 16-12 78-13315-02 . WCCP HTTP requests subject to Web Cache Coordination Protocol (WCCP) redirection are handled in the software. all conditions imposed by these match clauses must be met before a packet is policy routed. For ACL-based RPF checks. Catalyst 6000 Family Software Configuration Guide—Releases 6.Chapter 16 Using Cisco IOS ACLs in your Network Configuring Access Control Policy Routing Policy routing-required flows are handled in the software without impacting non-policy routed flow forwarding in the hardware.

page 16-xv Policy Routing. are handled in the software without impacting non-log flow forwarding in the hardware. Note When you enter the show ip access-list command. page 16-xvi Security Cisco IOS ACLs The IP and IPX security Cisco IOS ACLs with PFC2 are as follows: • If either the “ip unreachables” or “ip redirect” options are enabled. page 16-xvi Bridge-Groups. most of the packets of the flows that match a “deny” statement in an ACL are dropped by the hardware. page 16-xv NAT. idle timeout is not supported. Note IPX Cisco IOS ACLs with the source host node number specified cannot be enforced on the switch in the hardware. destination network. the match count displayed does not account for packets access controlled in the hardware. IP accounting for an ACL access violation on a given interface is supported by forwarding all denied packets for that interface to the software. page 16-xv WCCP. ACL flows requiring logging are handled in the software without impacting non-log flow forwarding in the hardware. page 16-xv TCP Intercept. however. If the ACL contains any other parameters. without impacting other flows. page 16-xiv Reflexive ACLs. and/or protocol type. it is handled in the software.4 78-13315-02 16-13 . destination node. These sections describe how different types of ACLs and traffic flows are handled by the hardware and the software in systems with PFC2: • • • • • • • • Security Cisco IOS ACLs. destination network.Chapter 16 Configuring Access Control Using Cisco IOS ACLs in your Network ACL feature processing requires forwarding some flows to the software. • • • • • • Catalyst 6000 Family Software Configuration Guide—Releases 6. page 16-xvi Unicast RPF Check. only a few packets are processed in software in order for the router to send the appropriate ICMP-unreachable message. Permit and deny actions of standard and extended ACLs (input and output) for security access control are handled in the hardware.3 and 6. IPX extended input and output ACLs are supported in the hardware when the ACL parameters are IPX source network. Dynamic (lock and key) ACL flows are supported in the hardware. IPX standard input and output ACLs are supported in the hardware when the ACL parameters are IPX source network. This process significantly degrades system performance. the MSFC has to process the ACL in the software. and/or destination node. The forwarding rate for software-forwarded flows is substantially less than for hardware-forwarded flows. Flows that require logging as specified by the ACL.

the following applies: a. b. If the route map contains only a “match ip address” and the “set” clause contains the “next hop” and the next hop is reachable. In intercept mode. Once the TCP intercept feature has been configured. Catalyst 6000 Family Software Configuration Guide—Releases 6. When a route map contains multiple “match” clauses.Chapter 16 Using Cisco IOS ACLs in your Network Configuring Access Control Reflexive ACLs ICMP packets are handled in the software. For TCP/UDP flows. The software establishes a connection with the client on behalf of the destination server. This process ensures that connection attempts from unreachable hosts never reach the server. then the packet is forwarded in hardware. once the connection is successfully established. all traffic belonging to the given 2. once the flow is established. HTTP replies from the server and the Cache Engine are handled in the hardware. all conditions imposed by these match clauses must be met before a packet is policy routed. The TCP intercept feature helps prevent SYN-flooding attacks by intercepting and validating TCP connection requests. Note that when reflexive ACLs are applied. 3.3 and 6. Note The mls ip pbr command is not required (and not supported) on PFC2. The hardware support for TCP intercept on a PFC2 is as follows: 1. the software installs a hardware shortcut to switch the rest of the flow in the hardware. For other modes of TCP intercept. the TCP intercept software intercepts TCP synchronization (SYN) packets from clients to servers that match an extended access list. all TCP SYN packets matching the ACEs with a permit clause in the TCP intercept ACL and which are permitted by the security ACL are sent to the software to apply the TCP intercept functionality. This process occurs even if the security ACL does not have the SYN flag specified.4 16-14 78-13315-02 . If a connection is established successfully. The software continues to intercept and forward packets throughout the duration of the connection. which are a type of denial-of-service attack. For route maps that only contain match length clauses. If a connection is not established successfully. the flow mask is changed to VLAN-full flow. all traffic matching the ACL in the match ip address clause is forwarded to the software regardless of the match length criteria. WCCP HTTP requests subject to WCCP redirection are handled in the software. However. there cannot be any other traffic belonging to that flow. If the TCP intercept is using intercept mode with timeout. and if successful. they are handled in hardware. Policy Routing Policy routing-required flows are handled in hardware or software depending on the route map. connection/flow is handled in the software. all packets received on the interface are forwarded to the software. establishes the connection with the server on behalf of the client and binds the two half-connections together transparently. TCP Intercept The TCP intercept feature implements software to protect TCP servers from TCP SYN-flooding attacks. for route maps containing both a match ip address and match length.

4 78-13315-02 16-15 . Note that if the translated flow should not be access controlled. NAT—VACLs are applied on packets before NAT translation. The following caveats apply to IOS ACLs when used with VACLs: • • Packets that require logging on the outbound ACLs are not logged if they are denied by a VACL. Using VACLs with Cisco IOS ACLs To access control both bridged and routed traffic.3 and 6. these packets will most likely match the deny ACE and be forwarded to the CPU. a packet is denied if it does not match any VACL ACE. irrespective of the IOS ACL configuration. page 16-xvii Guidelines for Using Layer 4 Operations. In the event of DOS attacks. You can define Cisco IOS ACLs on both input and output routed-VLAN interfaces. you can use VACLs only or a combination of Cisco IOS ACLs and VACLs. traffic denied by the unicast RPF ACL is forwarded to the MSFC2 for RPF validation. Under heavy traffic conditions. packets denied by the ACL are sent to the CPU for RPF validation. Note Drop-suppress statistics for ACL-based RPF check is not supported. the flow is denied or redirected. and you can define a VACL to access control the bridged traffic. These sections describe Cisco IOS ACL and VACL configuration guidelines and guidelines for Layer 4 operations: • • Guidelines for Configuring Cisco IOS ACLs and VACLs on the Same VLAN Interface. Caution With ACL-based unicast RPF. For ACL-based RPF checks. the flow might get access controlled after the translation because of the VACL configuration. If a flow matches a VACL deny or redirect clause in the ACL. Bridge-Groups Cisco IOS bridge-group ACLs are handled in the software. this could cause high CPU utilization. Note VACLs have an implicit deny at the end of the list. page 16-xxi Catalyst 6000 Family Software Configuration Guide—Releases 6. Unicast RPF Check The unicast RPF feature is supported in hardware on the PFC2.Chapter 16 Configuring Access Control Using VACLs with Cisco IOS ACLs NAT NAT-required flows are handled in the software without impacting non-NAT flow forwarding in the hardware.

page 16-xvii Limiting the Number of Actions. page 16-xvii Avoiding Layer 4 Port Information.4 16-16 78-13315-02 . Merging the Cisco IOS ACL with the VACL might significantly increase the number of ACEs. In the example. These sections provide Cisco IOS ACL and VACL configuration guidelines and examples: • • • • • • Using the Implicit Deny Action. the deny action in line 6 was grouped with permit actions. page 16-xviii Using the Implicit Deny Action If possible. Example 3. Grouping Actions Together To define multiple actions in an ACL (permit. or redirect and deny. enter the show security acl resource-usage command. and at the end of the list specifying permit ip any any (see Example 1. group each action type together. Limiting the Number of Actions An ACL with only permit ACEs has two actions: permit and deny (because of the implicit deny at the end of the list). Catalyst 6000 Family Software Configuration Guide—Releases 6. use the following guidelines for both Cisco IOS ACL and VACL configuration. you must merge a Cisco IOS ACL and a VACL when they are configured on the same VLAN. instead of 329.3 and 6. the result of merging would be 53 entries.Chapter 16 Using VACLs with Cisco IOS ACLs Configuring Access Control Guidelines for Configuring Cisco IOS ACLs and VACLs on the Same VLAN Interface Follow these guidelines when you need to configure a Cisco IOS ACL and a VACL on the same VLAN. Note To display the percentage of ACL storage being used. page 16-xviii Examples. The Catalyst 6000 family switch hardware provides one lookup for security ACLs for each direction (input and output). page 16-xvii Grouping Actions Together. page 16-xviii). You can achieve this same effect by defining all the deny entries. redirect and permit. deny. page 16-xviii Estimating Merge Results. These guidelines do not apply to configurations where you are mapping Cisco IOS ACLs and VACLs on different VLANs. and deny (because of the implicit deny at the end of the list). If you must configure a Cisco IOS ACL and a VACL on the same VLAN. redirect). use the implicit deny action at the end of an ACL (deny any any) and define ACEs to permit only allowed traffic. An ACL with permit and redirect has three actions: permit. If this deny action is removed. page 16-xix shows what can happen when you do not group each type together. When configuring an ACL. the best merge results are obtained when you specify only two different actions: permit and deny. redirect.

221. put the Layer 4 ACEs at the end of the list to prioritize the traffic filtering based on IP addresses.128 194.0. If you cannot follow the recommendations because the ACL has both IP and TCP/UDP/ICMP ACEs with Layer 4 information.72. destination IP address.15 2 permit udp host 147.72.33 194. To specify a redirect and permit ACL.64 0.6. adding this information will complicate the merging process. ACL B. use permit ACEs.52 eq 113 9 deny tcp any host 194.205 gt 1023 7 permit tcp any host 194. and you know the size of ACL A and ACL B.51 12 permit tcp any eq domain host 194.65. you will override the implicit deny ip any at the end of the list (see Example 4. and ACL C. redirect ACEs. protocol.72.72.0.52 8 permit tcp any host 194.1 0. you can get a rough estimate of the merge results for ACLs. and protocol ports). page 16-xx.0. Avoiding Layer 4 Port Information Avoid including Layer 4 information in an ACL.160 0.94 194.0.6.6.72.6. do not use any permit ACEs. If ACL C is the result of merging ACL A and ACL B.72. one VACL and one Cisco IOS ACL are configured on the same VLAN.51 gt 1023 14 permit ip any host 1.72.0 0.0. “Grouping Actions Together” section on page 16-xvii. and for the last ACE.6.213.6.17 host 194.150. Example 1 This example shows that the VACL does not follow the recommended guidelines (see line 9) and the resultant merge increases the number of ACEs: ******** VACL *********** 1 permit udp host 194. If you specify permit ip any any.6.3.72.1.15 eq bootps 3 permit udp 194.72.6.136.1. You will obtain the best merge results if the ACLs are filtered based on IP addresses (source and destination) and not on the full flow (source IP address.Chapter 16 Configuring Access Control Using VACLs with Cisco IOS ACLs To specify a redirect and deny ACL. Examples These examples show the merge results for various Cisco IOS ACL and VACL configurations. and Example 6.72.6. If you need to specify the full flow.1 Catalyst 6000 Family Software Configuration Guide—Releases 6. the upper limit could be higher.72. Note that in these examples. specify permit ip any any.72.0.51 eq ftp 10 permit tcp any host 194.6.255 host 194. you can estimate the upper limit of the size of ACL C when no Layer 4 port information has been specified on ACL A and ACL B. as follows: size of ACL C = (size of ACL A) x (size of ACL B) x (2) If Layer 4 port information was specified.1 host 194.73.4 78-13315-02 16-17 .6.3 and 6.72.51 eq ftp-data 11 permit tcp any host 194.72.72.51 13 permit tcp any host 194. Estimating Merge Results If you follow the ACL guidelines when configuring ACLs.23.198 eq tacacs 5 permit udp 194.6.74.0.15 eq tftp 6 permit udp host 193.0. see the recommendations in the “Using the Implicit Deny Action” section on page 16-xvii.6.64 0. The following example uses ACL A.6. page 16-xix).72.205 eq syslog 4 permit udp host 167.0.

255.255.0.255.0.213.72.51 neq ftp 12 permit tcp any host 194.198 eq tacacs 5 permit udp 194.72.0 7 permit tcp any range 0 65534 any range 0 65534 8 permit udp any range 0 65534 any range 0 65534 9 permit icmp any any 10 permit ip any any ******** IOS ACL ********** 1 deny ip any host 239.255 6 deny ip any 0.0 255.1 0.72.6.221.255 2 permit ip any any ******** MERGE ********** has 91 entries entries Example 2 In Example 1.1.255 3 deny tcp any any lt 30 4 deny udp any any lt 30 5 permit ip any any Catalyst 6000 Family Software Configuration Guide—Releases 6.205 gt 1023 7 permit tcp any host 194.6.255 2 permit ip any any ******** MERGE *********** has 78 entries Example 3 This example shows the VACL does not follow the recommended guidelines.1 ******** IOS ACL ************ 1 deny ip any host 239.255.255.0.255.15 eq tftp 6 permit udp host 193.0.1.72.51 gt 1023 13 permit ip any host 1.128 194.23.0.72.51 eq ftp-data 10 permit tcp any host 194. you get the following equivalent ACL with improved merge results (note that a deny ACE is not specified): ******** VACL ********** 1 permit udp host 194.0.15 eq bootps 3 permit udp 194.6.94 194.33 194.255 2 redirect 4/25 udp host 192.65.255.0.0.168.255.72. and the resultant merge significantly increases the number of ACEs: ******** VACL *********** 1 deny ip 0.74. and the resultant merge significantly increases the number of ACEs: ******** VACL *********** 1 redirect 4/25 tcp host 192.6.0.0 any 3 deny ip any 0.1 host 194.72.255 255.6.0 0.72.72.0.255 255.72.67 host 255.72.255 host 194.255.15 2 permit udp host 147.255.0 any 2 deny ip 0.67 host 255.0.255.136.255.255.6.255.Chapter 16 Using VACLs with Cisco IOS ACLs Configuring Access Control ******** IOS ACL ************ 1 deny ip any host 239.4 16-18 78-13315-02 . if you follow the guidelines and remove line 9 and modify lines 11 and 12.1.3.64 0.6.255.168.6.6.1.0.205 eq syslog 4 permit udp host 167.51 neq ftp 11 permit tcp any eq domain host 194.0.17 host 194.255.72.0.72.0.72.0 4 permit ip any host 239.73.255.72.64 0.52 8 permit tcp any host 194.6.0.150.160 0.0 255.255.255.255 5 permit ip any host 255.0.255.255.3 and 6.255 2 permit ip any any ******** MERGE ********** has 329 entries Example 4 This example shows that the VACL does not follow the recommended guidelines (three different actions are specified).6.6.52 eq 113 9 permit tcp any host 194.6.255.

0 0..64 0.0.73. produces a merge result of 801 entries: ******** VACL ********** 1 redirect 4/25 tcp host 192.77.0 0.7 gt 1023 8 permit udp host 158.72.6.72.77.0.15 gt 1023 2 permit tcp host 158.15 7 permit ip 147.0.15 3 permit ip 147. Following the guidelines in the “Using the Implicit Deny Action” section on page 16-xvii.0.0.160 0.255.65 194.0.7 194.0.0.152.] total 62 entries without L4 information ******** MERGE ********** has 801 ACEs Example 7 This example shows that the same Cisco IOS ACL that was used in Example 6 is merged with a VACL with Layer 4 port information.0.255 194.6.0.255.150.0.208 0.0.77.67 255.15 gt 1023 [.24 194.6.0.168.255 0..67 host 255.15 5 permit ip 147.73.152.213.255 3 permit ip any any ******* IOS ACL *********** 1 deny ip any host 239.6.7.255.0.72.0.255.37.73.0.0.72.248.0.72.1.169.73.15 [.31 194.0.128 0..6.8 194.0 2 redirect 4/25 udp host 192.1.64 0.15 eq time 5 permit udp 194.4 78-13315-02 16-19 .255 0.255 194.7 eq 1645 6 permit udp 194.0 0.43.1.64 0.6.0.255.0.0.31 host 194.0 0.0.15 eq 1645 7 permit udp host 158.224 0.0 0.31 194.72.150.72.160 0.0.0.6.0.0.72.64 0.255 2 redirect 4/25 udp host 192.72.1..72.0.0.151.1.0.1.0.0.6.0.0.168.213.6.0.255 5 deny tcp any any lt 30 6 deny udp any any lt 30 7 permit ip any any ******** IOS ACL *********** 1 permit ip 147.0.213.255 2 permit ip any any ******* MERGE ********** has 142 entries Example 5 This example shows the VACL has two different actions specified and the merge results are significantly improved: ******** VACL *********** 1 redirect 4/25 tcp host 192.255.6.168.0.224 0.15 2 permit ip 147.67 host 255.Chapter 16 Configuring Access Control Using VACLs with Cisco IOS ACLs ******* IOS ACL *********** 1 deny ip any host 239.6.255. the merge results are good.255.] total 168 entries Catalyst 6000 Family Software Configuration Guide—Releases 6.205 4 permit ip 147.0.1.255 host 194.64 0.128 0.0 0.72.0.0 3 redirect 4/25 icmp host 192.0. ******** VACL ********* 1 permit tcp host 193.73.67 host 255.1.0.205 8 permit ip host 193.224 0.65 194.67 host 255.67 255.255 2 permit ip any any ******* MERGE ********** has 4 entries Example 6 This example shows that applying the merging guidelines on a large Cisco IOS ACL (no Layer 4 port information is specified on the Cisco IOS ACL).72.72.73.0.72.0.255.128.7.168.0.3 and 6.121 194.0 0.255.255.255 194.7 194.7 eq time 4 permit udp any 194.255.151.151.6.224 0.255.64 0.0.131.255.77.0.255.0.168.73.151.0 0.7 gt 1023 3 permit udp any 194.73.168.0.150.255 4 redirect 4/25 ip host 192.0.15 6 permit ip 147.0.255.

0.64 0.0.Chapter 16 Using VACLs with Cisco IOS ACLs Configuring Access Control ******** IOS ACL ********* 1 permit ip 147.3 and 6. the recommended total number of Layer 4 operations is still nine or less.169.77.0 0.6.77.6.0.0.37.160 0.0. each new operation might cause the affected ACE to be translated into more than one ACE. in this ACL there are four different Layer 4 operations (“gt 10” and “gt 11” are considered two different Layer 4 operations): .213.15 6 permit ip 147.4 16-20 78-13315-02 . Layer 4 operations are considered different if the operator or the operand differ.205 4 permit ip 147. page 16-xxi Determining Logical Operation Unit Usage.15 5 permit ip 147.15 3 permit ip 147. .151.72.255 194. Use the following two guidelines to determine Layer 4 operation usage: 1. Guidelines for Using Layer 4 Operations Follow these guidelines for configurations where you need to specify Layer 4 port operations. If you exceed this number.72.150.0. For example.0.72.0.0.64 0.0 0..150.0..64 0.64 0.0.15 7 permit ip 147.151.0.0...64 0.255 194.64 0.0.0.6.160 0.72.77.6.0. gt 10 permit lt 9 deny gt 11 deny neq 6 redirect Catalyst 6000 Family Software Configuration Guide—Releases 6.31 194.31 host 194. ..15 2 permit ip 147... .121 194. Note If you have a Cisco IOS ACL and a VACL on the same VLAN interface.205 8 permit ip host 193.213.0.6.150.6.72.0.255 194.0.0.72.72.255 host 194.15 [.208 0.31 194. page 16-xxii Determining Layer 4 Operation Usage The switch hardware allows you to specify these types of operations: • • • • • gt (greater than) lt (less than) neq (not equal) eq (equal) range (inclusive range) We recommend that you do not specify more than nine different operations on the same ACL.0.213.] total 62 entries without L4 information ******* MERGE ******** has 1259 ACEs.0.151.0.6.6.0..0. These sections provide guidelines for specifying Layer 4 port operations: • • Determining Layer 4 Operation Usage.72.0.77.0 0...0 0.151.

. (dst ... LOU usage per Layer 4 operation is as follows: • • • • • gt uses 1/2 LOU lt uses 1/2 LOU neq uses 1/2 LOU range uses 1 LOU eq does not require a LOU For example.. See the “Determining Logical Operation Unit Usage” section on page 16-xxii for a description of LOUs.... (dst .. Dst gt 10 Note Check the ACL Layer 4 port operations resource usage using the show security acl resource-usage command..4 78-13315-02 16-21 .. (src .Chapter 16 Configuring Access Control Using VACLs with Cisco IOS ACLs Note There is no limit to the use of “eq” operators as the “eq” operator does not use a logical operator unit (LOU) or a Layer 4 operation bit. in this ACL there are two different Layer 4 operations because one ACE applies to the source port and one applies to the destination port. Layer 4 operations are considered different if the same operator/operand couple applies once to a source port and once to a destination port.... Src gt 10 ..... All ACLs use LOUs.. each LOU can store two different operator/operand couples with the exception of the range operator. .. (dst . Determining Logical Operation Unit Usage LOUs are registers that store operator/operand couples. 2. (dst . (dst . (src .3 and 6.... ... There can be up to 32 LOUs. Dst gt 10 A more detailed example follows: ACL1 . (dst port) port) port) port) port) port) gt 10 permit lt 9 deny gt 11 deny neq 6 redirect neq 6 redirect gt 10 deny port) port) port) port) gt 20 deny lt 9 deny range 11 13 permit neq 6 redirect The Layer 4 operations and LOU usage is as follows: • • • ACL1 Layer 4 operations: 5 ACL2 Layer 4 operations: 4 LOUs: 4 Catalyst 6000 Family Software Configuration Guide—Releases 6.. .. For example.. this ACL would use a single LOU to store two different operator/operand couples: ... (dst ACL2 . Src gt 10 .... (src .

page 16-xxiv Restricting the DHCP Response for a Specific Server.Chapter 16 Using VACLs in your Network Configuring Access Control An explanation of the LOU usage follows: • • • • LOU 1 stores “gt 10” and “lt 9” LOU 2 stores “gt 11” and “neq 6” LOU 3 stores “gt 20” (with space for one more) LOU 4 stores “range 11 13” (range needs the entire LOU) Using VACLs in your Network This section describes some typical uses for VACLs and includes the following: • • • • • • • Wiring Closet Configuration. Switch A. Catalyst 6000 family switches might not be equipped with MSFCs (routers).4 16-22 78-13315-02 . page 16-xxviii Wiring Closet Configuration In a wiring closet configuration. page 16-xxvii Capturing Traffic Flows. Traffic from Host X to Host Y can be access controlled at the traffic entry point. page 16-xxv Denying Access to a Server on Another VLAN. In this configuration. All HTTP traffic from Host X to Host Y would be dropped at Switch A and not be bridged to the switch with the MSFC. Traffic from Host X to Host Y is eventually being routed by the switch equipped with the MSFC. Catalyst 6000 Family Software Configuration Guide—Releases 6. page 16-xxvii Configuring ACLs on Private VLANs. page 16-xxvi Restricting ARP Traffic.3 and 6. If you do not want HTTP traffic switched from Host X to Host Y. the switch can still support a VACL and a QoS ACL. Suppose Host X and Host Y are in different VLANs and are connected to wiring closet Switch A and Switch C (see Figure 4). page 16-xxiii Redirecting Broadcast Traffic to a Specific Server Port. you can configure a VACL on Switch A.

Commit the VACL. With VACLs.4 78-13315-02 26959 VLAN 1 VLAN 2 Packet 16-23 . you can redirect these broadcast packets to the intended application server port. Permit all other traffic. Map the VACL to VLAN 10. Figure 5 shows an application broadcast packet from Host A being redirected to the target application server port and preventing other ports from receiving the packet. perform this task in privileged mode (TCP port 5000 is the intended server application port): Task Step 1 Step 2 Step 3 Step 4 Command set security acl ip SERVER redirect 4/1 tcp any host 255. Note You could apply the same concept to direct broadcast traffic to a multicast destination by redirecting the traffic to a group of ports (see Figure 5).255 eq 5000 set security acl ip SERVER permit ip any any commit security acl SERVER set security acl map SERVER 10 Redirect the broadcast packets.3 and 6. Catalyst 6000 Family Software Configuration Guide—Releases 6.255.255.Chapter 16 Configuring Access Control Using VACLs in your Network Figure 16-4 Wiring Closet Configuration Catalyst 6500 series switches with MSFC Switch A with PFC only VACL: deny http from X to Y http is dropped at entry point Host X Switch C with PFC only Host Y Redirecting Broadcast Traffic to a Specific Server Port Some application traffic uses broadcast packets that reach every host in a VLAN. To redirect broadcast traffic to a specific server port.

3 and 6.4): Task Step 1 Step 2 Step 3 Step 4 Step 5 Command set security acl ip SERVER permit udp host 1.3. Permit other IP traffic. Commit the VACL.2. With VACLs. perform this task in privileged mode (the target DHCP server IP address is 1.4.4 16-24 78-13315-02 .3.3. Catalyst 6000 Family Software Configuration Guide—Releases 6. they reach every DHCP server in the VLAN and multiple responses are returned. Map the VACL to VLAN 10.4 any eq 68 set security acl ip SERVER deny udp any any eq 68 set security acl ip SERVER permit any commit security acl SERVER set security acl map SERVER 10 Permit a DHCP response from host 1.2. To restrict DHCP responses for a specific server.2.Chapter 16 Using VACLs in your Network Configuring Access Control Figure 16-5 Redirecting Broadcast Traffic to a Specific Server Port VACL Target server 4/1 Catalyst 6500 series switches with PFC Host A Host B Host C VLAN 10 Application broadcast packet 26960 Restricting the DHCP Response for a Specific Server When Dynamic Host Configuration Protocol (DHCP) requests are broadcast. you can restrict the response from a specific DHCP server and drop the other responses. Deny DHCP responses from any other host.

1.255 host 10.0.1. To deny access to a server on another VLAN.4. Hosts 10. Figure 16-6 Redirect DHCP Response for a Specific Server VACL Target server 1.1.3.1.2. perform this task in privileged mode: Task Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Command set security acl ip SERVER deny ip 10.100 in VLAN 10 needs to have access restricted as follows (see Figure 7): • • Hosts in subnet 10.3 and 6.0/24 in VLAN 20 should not have access.2.1.Chapter 16 Configuring Access Control Using VACLs in your Network Figure 6 shows that only the target server returns a DHCP response from the DHCP request.2.1.100 set security acl ip SERVER permit ip any any commit security acl SERVER set security acl map SERVER 10 Deny traffic from hosts in subnet 10.1.8 in VLAN 10 should not have access.1.8 host 10.1. For example.1.1. Deny traffic from host 10. Commit the VACL.0.1.1. Deny traffic from host 10.100 set security acl ip SERVER deny ip host 10.0 0. server 10.1. Catalyst 6000 Family Software Configuration Guide—Releases 6. Map the VACL to VLAN 10.1.1.0/8.1.1.1.1.4 78-13315-02 16-25 .8.4 and 10.2.4 host 10.4 Host A Catalyst 6500 series switches with PFC Host B Host C VLAN 10 DHCP response packets 26962 Denying Access to a Server on Another VLAN You can restrict access to a server on another VLAN.1.100 set security acl ip SERVER deny ip host 10. Permit other IP traffic.1.1.

100 Server (VLAN 10) 10.0/24 Host (VLAN 20) Restricting ARP Traffic Note This feature is only available with Supervisor Engine 2 with PFC2.8 Host (VLAN 10) 26963 Catalyst 6500 series switches with PFC Subnet 10.1. ACLs can be applied as follows: • • • • • You can map VACLs to secondary VLANs or primary VLANs.1(1). You cannot map dynamic ACEs to a private VLAN.1(1) and later releases.1. Configuring ACLs on Private VLANs Private VLANs allow you to split a primary VLAN into sub-VLANs (secondary VLANs) that can be either community VLANs or isolated VLANs.3 and 6. ARP traffic is disallowed on the VLAN that the ACL is mapped to.1. Catalyst 6000 Family Software Configuration Guide—Releases 6.Chapter 16 Using VACLs in your Network Configuring Access Control Figure 16-7 Deny Access to a Server on Another VLAN VACL 10. In software release 6. You can disallow ARP traffic on a per VLAN basis using the set security acl ip acl_name deny arp command. ARP traffic is permitted on each VLAN by default.4 Host (VLAN 10) 10.1.1. you could configure ACLs on a primary VLAN only and the ACL would then be applied to all the secondary VLANs. it filters the traffic from the router to the host and if you map a VACL to a secondary VLAN.4 16-26 78-13315-02 .2. You cannot map Cisco IOS ACLs to secondary VLANs. Cisco IOS ACLs that are mapped to a primary VLAN get mapped to the associated secondary VLANs. enter the set security acl ip acl_name permit arp command.1. In releases prior to software release 6. If you map a VACL to a primary VLAN. To allow ARP traffic on a VLAN that has had ARP traffic disallowed. You can map QoS ACLs to secondary VLANs or primary VLANs. When you enter this command.1. it filters the traffic from the host to the router.

and destination node number only. The source node number and socket number are not supported when specifying the IPX flow. you can use two-way community VLANs to perform an inverse mapping from the primary VLAN to the secondary VLAN when the traffic crosses the boundary of a private VLAN through a promiscuous port. Unsupported Features This section lists ACL-related features that are not supported or have limited support on the Catalyst 6000 family switches. Non full-flow IPX VACL—IPX VACL is based on a flow specified by a source/destination network number. • Non-IP version 4/non-IPX Cisco IOS ACLs—The following types of Cisco IOS security ACLs cannot be enforced on the switch in the hardware.Chapter 16 Configuring Access Control Unsupported Features Note With software releases 6.4 78-13315-02 16-27 .2(1) and later. see the “Configuring Private VLANs” section on page 11-13.3 and 6. packet type. Capturing Traffic Flows See the “Capturing Traffic Flows on Specified Ports” section on page 16-xxxix for complete configuration details. the MSFC has to process the ACL in the software and this significantly degrades system performance: – Bridge-group ACLs – IP accounting – Inbound and outbound rate limiting – Standard IPX with source node number – IPX extended access lists that specify a source node number or socket numbers are not enforced in the hardware – Standard XNS access list – Extended XNS access list – DECnet access list – Extended MAC address access list – Protocol type-code access list • • IP packets with a header length of less than five will not be access controlled. Both outbound and inbound traffic can be carried on the same VLAN allowing VLAN-based VACLs to be applied in both directions on a per-community (per customer) basis. Catalyst 6000 Family Software Configuration Guide—Releases 6. Note For additional information on private VLANS.

• • • • • • See the “Guidelines for Configuring Cisco IOS ACLs and VACLs on the Same VLAN Interface” section on page 16-xvii. Note that a VACL has to be committed before you can map it to a VLAN. Committed ACLs with no ACEs are deleted. page 16-xxx VACL Configuration Guidelines Follow these guidelines when configuring VACLs: Caution All changes to ACLs are stored temporarily in an edit buffer. Always enter the show security acl info acl_name editbuffer command to see the current list of ACEs before making any changes to the edit buffer. See the “Unsupported Features” section on page 16-xxviii. Prior to performing any configuration tasks.Chapter 16 Configuring VACLs Configuring Access Control Configuring VACLs This section describes how to configure VACLs. See the “Configuring and Storing VACLs and QoS ACLs in Flash Memory” section on page 16-xliii for detailed information. Note You can configure Cisco IOS ACLs and VACLs from Flash memory instead of NVRAM. This situation occurs because some ACL space is reserved in hardware for the ACL manager to perform cleanup and mapping if necessary. • • • • • Catalyst 6000 Family Software Configuration Guide—Releases 6. Note that in systems with redundant MSFCs. all traffic is permitted.4 16-28 78-13315-02 . Note that the system might incorrectly calculate the maximum number of ACLs in the system if an ACL is deleted but not committed. Note that the system might take longer to boot if you configure a very large number of ACLs.3 and 6. If no ACEs match. page 16-xxix VACL Configuration Summary. Note that if there is no Cisco IOS ACL configured to deny traffic on a routed VLAN interface (input or output). There are no default VACLs and no default VACL-to-VLAN mappings. See the “Using VACLs in your Network” section on page 16-xxiii for configuration examples. These sections provide guidelines and a summary for configuring VACLs: • • VACL Configuration Guidelines. Note that the show security acl resource-usage and show qos acl resource-usage commands might not show 100 percent usage even if there is no space in the hardware to store more ACLs. A packet that comes into the switch is applied against the first ACE in the ACL. see the “VACL Configuration Guidelines” section on page 16-xxix. We recommend that you enter ACEs in batches and enter the commit command to save all of them to NVRAM. the ACL configurations for Cisco IOS ACLs and VACLs must be the same on both MSFCs. You must enter the commit command to commit all ACEs to NVRAM. the packet is applied against the next ACE in the list. If there is no match. and no VACL configured. Note that the order of ACEs in an ACL is important. the packet is denied (dropped).

page 16-xxxvi Showing the Contents of a VACL. You might have to configure the redirect port as a trunk to allow multiple VLANs to go out of the port.3 and 6. – Put caches in promiscuous mode so they can receive traffic that is not routed. there is no routing involved. – Note that the redirect option only involves taking packets and sending them out the redirect port.4 78-13315-02 16-29 . Configuring VACLs From the CLI This section describes how to create and activate VACLs on the Catalyst 6000 family switches. you can configure IPX and non-IP version 4/non-IPX VACLs using the same basic steps. – Use the redirect option to do some basic VLAN-based load balancing by redirecting traffic to multiple ports. Enter the set security acl map command to map the VACL to a VLAN. page 16-xxxi Creating an IPX VACL and Adding ACEs. page 16-xxxvii Showing VACL-to-VLAN Mapping. perform these steps: Step 1 Step 2 Step 3 Enter the set security acl ip command to create a VACL and add ACEs. the redirect port should have those VLANs in forwarding state. Note VACLs have an implicit deny feature at the end of the list. Note An IP VACL is used in this description. VACL Configuration Summary To create a VACL and map it to a VLAN. This section describes the following tasks: • • • • • • • Creating an IP VACL and Adding ACEs. page 16-xxxvi Mapping a VACL to a VLAN. – Note that if packets are coming in from many VLANs. Enter the commit command to commit the VACL and its associated ACEs to NVRAM.Chapter 16 Configuring Access Control Configuring VACLs • Follow these guidelines for using the redirect option: – Note that redirected packets can only go out a port that supports the VLAN that the traffic is in. These tasks are listed in the order that they should be performed. page 16-xxxiii Creating a Non-IP Version 4/Non-IPX VACL (MAC VACL) and Adding ACEs. page 16-xxxvii Catalyst 6000 Family Software Configuration Guide—Releases 6. a packet is denied if it does not match any VACL ACE. Each port transmits only those packets that belong to the VLANs that are forwarding on the port. page 16-xxxv Committing ACLs.

0. page 16-xxxviii Clearing the Security ACL Map.2: Console> (enable) set security acl ip IPACL1 deny host 171.3. page 16-xli Creating an IP VACL and Adding ACEs To create a new IP VACL and add ACEs.4 any 2.0. Console> (enable) This example shows how to create an ACE for IPACL1 to block traffic from source address 171.3. If an IP protocol is specified. Use ‘commit’ command to apply changes.Chapter 16 Configuring VACLs Configuring Access Control • • • • • • Clearing the Edit Buffer.4 16-30 78-13315-02 . This example shows how to create an ACE for IPACL1 to allow traffic from source address 172. deny ip host 171.20. The log keyword provides logging messages for denied IP VACLs only.53. page 16-xxxix Configuring VACL Logging.8.20. This example shows how to create an ACE for IPACL1 to allow traffic from all source addresses: Console> (enable) set security acl ip IPACL1 permit any IPACL1 editbuffer modified.0 IPACL1 editbuffer modified.4 0. perform these tasks in privileged mode: Task • Command set security acl ip {acl_name} {permit | deny} {src_ip_spec} [capture] [before editbuffer_index | modify editbuffer_index] [log 1] set security acl ip {acl_name} {permit | deny | redirect mod_num/ port_num} {protocol} {src_ip_spec} {dest_ip_spec} [precedence precedence] [tos tos] [capture] [before editbuffer_index | modify editbuffer_index] [log1] If an IP protocol specification is not required.8. page 16-xxxviii Displaying VACL Management Information. Console> (enable) Note The example shows that because VACLs have an implicit deny feature at the end of the list. all other traffic is denied. use the following syntax.20. Console> (enable) This example shows how to display the contents of the edit buffer: Console> (enable) show security acl info IPACL1 editbuffer set security acl ip IPACL1 ----------------------------------------------------------------1. or to add ACEs to an existing IP VACL.3. Use ‘commit’ command to apply changes.8. • 1. permit ip any any 3. use the following syntax. page 16-xxxix Capturing Traffic Flows on Specified Ports.2 any Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.4: Console> (enable) set security acl ip IPACL1 permit host 172.53. page 16-xxxviii Removing ACEs from Security ACLs. permit ip host 172.2 IPACL1 editbuffer modified.53.3 and 6. Use ‘commit’ command to apply changes.

Console> (enable) set security acl ip IPACL2 deny host 172. This example shows how to create an ACE for IPACL2 to block traffic from source address 172.2.3. enter the set security acl map command to map it to a VLAN. Console> (enable) Note For more information about the commit security acl all command.255.255 precedence 1 tos min-delay IPACL2 editbuffer modified.2 2.3. redirect 1.0. Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.2. If this VACL has not been mapped to a VLAN.4 78-13315-02 16-31 .3.3. ACL IPACL1 is committed to hardware.3 and 6. tos—Type of service levels that range between 0 and 15. This example shows how to commit the ACEs to NVRAM: Console> (enable) commit security acl all ACL commit in progress. Console> (enable) This example shows how to create an ACE for IPACL2 to redirect IP traffic to port 3/1 from source address 1. Note that host can be used as an abbreviation for a source and source-wildcard of 0.255.255. Use ‘commit’ command to apply changes. Enter the show security acl info acl_name [editbuffer] command to see the current ACE listing stored in NVRAM (enter the editbuffer keyword to see edit buffer contents). you can use the modify keyword to replace an existing ACE with a new ACE. deny 172.3.3.255 host 255.2. see the “Showing the Contents of a VACL” section on page 16-xxxvii. ACL IPACL2 is committed to hardware.20. Optionally. Console> (enable) set security acl ip IPACL2 redirect 3/1 ip 1. Console> (enable) This example shows how to display the contents of the edit buffer: Console> (enable) show security acl info IPACL2 editbuffer set security acl ip IPACL2 ----------------------------------------------------------------1.0.4 Console> (enable) Note For more information about the show security acl info command.20. This ACE also specifies the following: • • precedence—IP precedence values that range between zero for low priority and seven for high priority.2 and place this ACE before ACE number 2 in the VACL.4 0.255.0. Enter the show security acl info IPACL1 command to verify that the changes were committed.0.20.2 before 2 IPACL2 editbuffer modified. see the “Committing ACLs” section on page 16-xxxvi.0.Chapter 16 Configuring Access Control Configuring VACLs This example shows how to commit the ACEs to NVRAM: Console> (enable) commit security acl all ACL commit in progress. Use ‘commit’ command to apply changes.4 with the destination address of 255.255.

perform this task in privileged mode: Task Create a new IPX VACL and add ACEs.3.]dest_node_mask]] [capture] [before editbuffer_index modify editbuffer_index] This example shows how to create an ACE for IPXACL1 to block all traffic from source network 1234: Console> (enable) set security acl ipx IPXACL1 deny any 1234 IPXACL1 editbuffer modified.4: Console> (enable) set security acl ipx IPXACL1 deny any any 1.4 3. enter the set security acl map command to map it to a VLAN. deny any any 1.4 16-32 78-13315-02 . Console> (enable) This example shows how to create an ACE for IPXACL1 to block all traffic with destination address 1. see the “Showing the Contents of a VACL” section on page 16-xxxvii.3 and 6. If this VACL has not been mapped to a VLAN. Use ‘commit’ command to apply changes. Creating an IPX VACL and Adding ACEs To create a new IPX VACL and add ACEs. redirect 4/1 any 3456 Console> (enable) Note For more information about the show security acl info command.4 IPXACL1 editbuffer modified. Use ‘commit’ command to apply changes.A.3. Command set security acl ipx {acl_name} {permit | deny | redirect mod_num/port_num} {protocol} {src_net} [dest_net. Enter the show security acl info IPACL2 command to verify that the changes were committed. Console> (enable) This example shows how to create an ACE for IPXACL1 to redirect broadcast traffic to port 4/1 from source network 3456: Console> (enable) set security acl ipx IPXACL1 redirect 4/1 any 3456 IPXACL1 editbuffer modified. or to add ACEs to an existing IPX VACL. Console> (enable) This example shows how to display the contents of the edit buffer: Console> (enable) show security acl info IPXACL1 editbuffer set security acl ipx IPXACL1 ----------------------------------------------------------------1. Use ‘commit’ command to apply changes. Catalyst 6000 Family Software Configuration Guide—Releases 6.A.Chapter 16 Configuring VACLs Configuring Access Control Note For more information about the commit security acl all command see the “Committing ACLs” section on page 16-xxxvi.3.[dest_node] [[dest_net_mask.A. or add ACEs to an existing IPX VACL. deny any 1234 2.

redirect 4/1 any 3456 5. Console> (enable) This example shows how to display the contents of the edit buffer: Console> (enable) show security acl info IPXACL1 editbuffer set security acl ipx IPXACL1 ----------------------------------------------------------------1.3. Use ‘commit’ command to apply changes. Console> (enable) Note For more information about the commit security acl all command. Enter the show security acl info IPXACL1 command to verify that the changes were committed.Chapter 16 Configuring Access Control Configuring VACLs This example shows how to commit the ACEs to NVRAM: Console> (enable) commit security acl all ACL commit in progress.3 and 6.A. Use ‘commit’ command to apply changes. permit any any ACL IPXACL1 Status: Not Committed Console> (enable) This example shows how to commit the ACEs to NVRAM: Console> (enable) commit security acl all ACL commit in progress. deny any 1234 2. ACL IPXACL1 is committed to hardware.4 78-13315-02 16-33 . enter the set security acl map command to map it to a VLAN. enter the set security acl map command to map it to a VLAN. see the “Committing ACLs” section on page 16-xxxvi. This example shows how to create an ACE for IPXACL1 to allow all traffic from source network 1 and insert this ACE before ACE number 2: Console> (enable) set security acl ipx IPXACL1 permit any 1 before 2 IPXACL1 editbuffer modified. ACL IPXACL1 is committed to hardware. If this VACL has not been mapped to a VLAN. Console> (enable) Enter the show security acl info IPXACL1 command to verify that the changes were committed. permit any 1 3. Catalyst 6000 Family Software Configuration Guide—Releases 6. Console> (enable) This example shows how to create an ACE for IPXACL1 to allow traffic from all source addresses: Console> (enable) set security acl ipx IPXACL1 permit any any IPXACL1 editbuffer modified. If this VACL has not been mapped to a VLAN.4 4. deny any any 1.

This example shows how to commit the ACEs to NVRAM: Console> (enable) commit security acl all ACL commit in progress. Console> (enable) This example shows how to display the contents of the edit buffer: Console> (enable) show security acl info MACACL1 editbuffer set security acl mac MACACL1 ----------------------------------------------------------------1. ACL MACACL1 is committed to hardware. perform this task in privileged mode: Task Create a new non-IP version 4/non-IPX VACL and add ACEs. Command set security acl mac {acl_name} {permit | deny} {src_mac_addr_spec} {dest_mac_addr_spec} [ether-type] [capture] [before editbuffer_index | modify editbuffer_index] This example shows how to create an ACE for MACACL1 to block all traffic from 8-2-3-4-7-A: Console> (enable) set security acl mac MACACL1 deny host 8-2-3-4-7-A any MACACL1 editbuffer modified. and so on) are classified as MAC traffic and MAC VACLs are used to access control this traffic. Use ‘commit’ command to apply changes. deny any A-B-C-D-1-2 3. To create a new non-IP version 4/non-IPX VACL and add ACEs. or add ACEs to an existing non-IP version 4/non-IPX VACL. Use ‘commit’ command to apply changes. Use ‘commit’ command to apply changes. or to add ACEs to an existing non-IP version 4/non-IPX VACL. Console> (enable) This example shows how to create an ACE for MACACL1 to block all traffic to A-B-C-D-1-2: Console> (enable) set security acl mac MACACL1 deny any host A-B-C-D-1-2 MACACL1 editbuffer modified. permit any any Console> (enable) Note For more information about the show security acl info command. All other traffic types (AppleTalk. Console> (enable) This example shows how to create an ACE for MACACL1 to allow traffic from all sources: Console> (enable) set security acl mac MACACL1 permit any any MACACL1 editbuffer modified.3 and 6.Chapter 16 Configuring VACLs Configuring Access Control Creating a Non-IP Version 4/Non-IPX VACL (MAC VACL) and Adding ACEs Caution IP traffic and IPX traffic are not access controlled by MAC VACLs. Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.4 16-34 78-13315-02 . see the “Showing the Contents of a VACL” section on page 16-xxxvii. DECnet. deny 8-2-3-4-7-A any 2.

If this VACL has not been mapped to a VLAN. see the “Committing ACLs” section on page 16-xxxvi. Console> (enable) Mapping a VACL to a VLAN You can map a VACL to a VLAN with the set security acl map command. ACL IPACL2 is committed to hardware. Committing ACLs You can commit all ACLs or a specific ACL to NVRAM with the commit command. Command set security acl map acl_name vlans This example shows how to map IPACL1 to VLAN 10: Console> (enable) set security acl map IPACL1 10 ACL IPACL1 mapped to vlan 10 Console> (enable) This example shows the output if you try to map an ACL that has not been committed: Console> (enable) set security acl map IPACL1 10 Commit ACL IPACL1 before mapping. Any committed ACL with no ACEs will be deleted. To map a VACL to a VLAN. enter the set security acl map command to map it to a VLAN. Enter the show security acl info MACACL1 command to verify that the changes were committed. Command commit security acl acl_name | all This example shows how to commit a specific security ACL to NVRAM: Console> (enable) commit security acl IPACL2 ACL commit in progress.4 78-13315-02 16-35 . perform this task in privileged mode: Task Commit an ACL to NVRAM. Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.Chapter 16 Configuring Access Control Configuring VACLs Note For more information about the commit security acl all command. To commit an ACL to NVRAM. Note that there is no default ACL-to-VLAN mapping. all VACLs need to be mapped to a VLAN. perform this task in privileged mode: Task Map a VACL to a VLAN.

VLAN 1 is mapped to MAC ACL MACACL1.Chapter 16 Configuring VACLs Configuring Access Control Showing the Contents of a VACL You can display the contents of a VACL with the show security acl info command. permit any This example shows how to show the contents of a VACL that is still in the edit buffer: Console> (enable) show security acl info IPACL1 editbuffer set security acl ip IPACL1 ----------------------------------------------------------------1. show security acl map {acl_name | vlan | all} This example shows how to show the mappings of a specific VACL: Console> (enable) show security acl map IPACL1 ACL IPACL1 is mapped to VLANs: 1 Console> (enable) This example shows how to show the mappings of a specific VLAN: Console> (enable) show security acl map 1 VLAN 1 is mapped to IP ACL IPACL1.4 16-36 78-13315-02 . deny ip B any 3. deny A 2. VLAN 1 is mapped to IPX ACL IPXACL1. deny D 5. deny A 2. deny c 4. deny C 4. perform this task in privileged mode: Task Command Show VACL-to-VLAN mapping. Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. To show VACL-to-VLAN mapping. Command show security acl info {acl_name | all} [editbuffer [editbuffer_index]] This example shows how to show the contents of a VACL that has been saved in NVRAM: Console> (enable) show security acl info IPACL1 set security acl ip IPACL1 -----------------------------------------------------------------1. deny ip B any 3. perform this task in privileged mode: Task Show the contents of a VACL.3 and 6. To show the contents of a VACL. permit any Console> (enable) Showing VACL-to-VLAN Mapping You can display VACL-to-VLAN mapping for a specified ACL or VLAN with the show security acl map command.

Console> (enable) This example shows how to remove a specific ACE from a specific ACL: Console> (enable) clear security acl IPACL1 2 IPACL1 editbuffer modified. Command rollback security acl {acl_name | all | adjacency} This example shows how to clear the edit buffer of a specific security ACL: Console> (enable) rollback security acl IPACL1 Editbuffer for ‘IPACL1’ rolled back to last commit state.4 78-13315-02 16-37 . Command clear security acl map all clear security acl map acl_name clear security acl map vlan clear security acl map acl_name vlan Catalyst 6000 Family Software Configuration Guide—Releases 6. To clear the security ACL map. To remove an ACE from a security ACL. Console> (enable) Clearing the Security ACL Map You can remove a VACL-to-VLAN mapping with the clear security acl map command.3 and 6. perform this task in privileged mode: Task Command Remove an ACE from a security ACL. clear security acl all clear security acl acl_name clear security acl acl_name editbuffer_index This example shows how to remove ACEs from all the ACLs: Console> (enable) clear security acl all All editbuffers modified.Chapter 16 Configuring Access Control Configuring VACLs Clearing the Edit Buffer You can clear changes made to the ACL edit buffer since its last save with the rollback command. To clear the ACL edit buffer. The ACL is rolled back to its state at the last commit command. Use ‘commit’ command to apply changes. This command deletes the ACEs from the edit buffer. perform this task in privileged mode: Task Clear the security ACL map. Console> (enable) Removing ACEs from Security ACLs You can remove a specific ACE or all ACEs from an ACL with the clear security acl command. Use ‘commit’ command to apply changes. perform this task in privileged mode: Task Clear the ACL edit buffer.

.39% ACL layer 4 port operators: 0.0% Console (enable) Capturing Traffic Flows on Specified Ports You can use the capture option in the set security acl (ip. The capture port cannot be an ATM port. display text omitted Console> (enable) This example shows how to clear the mapping for a specific VACL on a specific VLAN: Console> (enable) clear security acl map IPACL1 50 Map deletion in progress. Configuration Guidelines Follow these guidelines when configuring capture ports: • • • The capture port cannot be part of an EtherChannel. they send out only the traffic belonging to the VLANs of the captured port. The capture port must be in the spanning tree forwarding state for the VLAN. Successfully cleared mapping between ACL ip1 and VLAN 10.Chapter 16 Configuring VACLs Configuring Access Control This example shows how to clear all VACL-to-VLAN mappings: Console> (enable) clear security acl map all Map deletion in progress.. Command show security acl resource-usage This example shows how to display VACL management information: Console> (enable) show security acl resource-usage ACL resource usage: ACL storage (mask/value): 0. Console> (enable) Displaying VACL Management Information You can display VACL management information with the show security acl resource-usage command.4 16-38 78-13315-02 . You can specify capture ports using the set security acl capture-ports mod/ports. Successfully cleared mapping between ACL ipx1 and VLAN 10.. When you use the capture option. ipx. Capture ports do not send out all the captured traffic.3 and 6... Successfully cleared mapping between ACL ipacl1 and VLAN 50.. perform this task in privileged mode: Task Display VACL management information. packets that match the specified flows are switched normally but are also captured and transmitted out of the capture ports.29%/0. command. Catalyst 6000 Family Software Configuration Guide—Releases 6. and mac) commands to specify that packets that match the specified flows are captured and transmitted out of capture ports. To display VACL management information.10% ACL to switch interface mapping table: 0.

To capture traffic going to many VLANs. For bridged traffic. ensure that the capture port is in the same VLAN as the bridged traffic. If the capture port is in VLAN 10. command to specify capture ports. Console> (enable) This example shows how to commit the my_cap ACL to NVRAM: Console> (enable) commit security acl my_cap ACL commit in progress.1. Enter the set security acl map command to map the VACL to a VLAN. If a packet is dropped due to an ACL. If you want to capture traffic from one VLAN going to many VLANs. Step 1 Step 2 Step 3 Step 4 Enter the set security acl ip command to create a VACL and add ACEs.. For routed traffic. Capture ports do not transmit out all captured traffic. packets are transmitted out of a port only if the output VLAN of the Layer 3 switched flow is the same as the capture port VLAN. the packet cannot be captured.3 and 6. Configuration Examples This example shows how to create an ACE for my_cap and specify that the allowed traffic be captured: Console> (enable) set security acl ip my_cap permit ip host 60. Enter the commit command to commit the VACL and its associated ACEs to NVRAM.1. This traffic gets transmitted out of the capture port only if it belongs to VLAN 20 or if the port is a trunk carrying VLAN 20. include the capture option. Configure as many ACEs per ACL as necessary to capture the desired traffic. the capture port should be a trunk carrying the required VLANs. the capture port has to be a trunk carrying all output VLANs.4 78-13315-02 16-39 . They transmit only traffic belonging to the capture port VLAN.Chapter 16 Configuring Access Control Configuring VACLs • • • You can specify any number of switch ports as capture ports. you can configure IPX and non-IP version 4/non-IPX VACLs using the same basic steps.98 capture my_cap editbuffer modified.1 host 60. To capture traffic flows.1. ACL my_cap successfully committed. it does not transmit any traffic. capture ports transmit packets only after they are Layer 3 switched.. For example. Enter the set security acl capture-ports mod/ports. assume you have flows from VLAN 10 to VLAN 20 and you add a VACL (on one of the VLANs) permitting these flows and you specify a capture port. Use ’commit’ command to apply changes. you can configure one ACL and map it to a group of VLANs or you can configure a number of ACLs and map each to one VLAN. Whether a capture port transmits the traffic or not is independent of the VLAN on which you placed the VACL. perform these steps: Note An IP VACL is used in this description. because all the traffic remains in the same VLAN. Only permit traffic is captured. • To capture traffic. Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.1. Capture ports are added to a capture port list and the configuration is saved in NVRAM.

VLAN 10 successfully mapped to ACL my_cap. Console> (enable) This example shows how to specify capture ports: Console> (enable) set security acl capture-ports 1/1-2. and subsequent packets are collected over 5-minute intervals before they are displayed or logged.2/2 Console> (enable) Configuring VACL Logging Note This feature is only available with Supervisor Engine 2 with Layer 3 Switching Engine II (PFC2). see Chapter 27. You can log messages about denied packets for the standard IP access list by entering the log keyword for deny VACLs.2/1-2 Console> (enable) This example shows how to clear capture ports: Console> (enable) clear security acl capture-ports 1/1.3 and 6. That is.4 16-40 78-13315-02 . For information on configuring system message logging.2/1 Console> (enable) This example shows that ports 1/1 and 2/1 were cleared: Console> (enable) show security acl capture-ports ACL Capture Ports:1/2. The old mapping with ACL captest was replaced with the new one. system logging messages are sent to the console.2/1 Successfully cleared the following ports: 1/1.2/1-2 Console> (enable) This example shows how to display ports that have been specified as capture ports: Console> (enable) show security acl capture-ports ACL Capture Ports: 1/1-2. The level of messages logged to the console is controlled by the set logging level acl severity command. The first packet that triggers the access list causes a logging message right away.Chapter 16 Configuring VACLs Configuring Access Control This example shows how to map my_cap to VLAN 10: Console> (enable) set security acl map my_cap 10 Mapping in progress. You can configure the switch to send system logging messages to a syslog server.” Configuration Guidelines Follow these guidelines when configuring VACL logging: • • Log only deny traffic from IP VACLs. “Configuring System Message Logging. By default. The logging message includes the flow pattern and number of packets received in the prior 5-minute interval.2/1-2 Successfully set the following ports to capture ACL traffic: 1/1-2. You must set the logging level to 6 (information) or 7 (debugging). any packet that matches the access list will cause an informational logging message about the packet to be sent to the console. Catalyst 6000 Family Software Configuration Guide—Releases 6.

perform these steps: Step 1 Step 2 Enter the set logging level acl severity command to set the logging level to 6 (information) or 7 (debugging). If successful. the new buffer replaces the old one and all flows in the old table are cleared. Messages are not logged for these packets. the command is dropped and the range is displayed on the console. Valid values are from 500 to 5000. the command is discarded and the range is displayed on the console. Step 4 Step 5 Step 6 Enter the set security acl ip acl_name deny log command to create an IP VACL and enable logging.3 and 6. Configuration Examples This example shows how to set the logging level: Console> (enable) set logging level acl 6 System logging facility <acl> for this session set to severity 6(information) This example shows how to allocate a new log table based on the maximum flow: Console> (enable) set security acl log maxflow 512 Set VACL Log table to 512 flow patterns. If the configuration is over the range. Enter the set security acl map acl_name vlan command to map the VACL to a VLAN. the default value is 2500. Messages are not logged for these packets.4 78-13315-02 16-41 . Enter the commit security acl acl_name command to commit the VACL to NVRAM. the default value is 500.Chapter 16 Configuring Access Control Configuring VACLs To enable VACL logging. This example shows how to display the VACL log configuration: Console> (enable) show security acl log config VACL LOG Configration ------------------------------------------------------------Max Flow Pattern : 512 Redirect Rate (pps) : 1000 Catalyst 6000 Family Software Configuration Guide—Releases 6. Step 3 (Optional) Enter the set security acl log ratelimit pps to set the redirect rate in pps (packet per second). an error message is displayed and the command is dropped. (Optional) Enter the set security acl log maxflow max_number to allocate a new log table based on the maximum flow pattern number to store logged packet information. This example shows how to set the redirect rate: Console> (enable) set security acl log ratelimit 1000 Set Redirect Rate to 1000 pps. an error message is displayed and the command is dropped. If either memory is not enough or the maximum number is over the limit. Note If the redirect rate is over the pps range. Valid values are from 256 to 2048. Note If the maximum flow pattern is over the max_num limit.

0.255(3000).0.0. Catalyst 6000 Family Software Configuration Guide—Releases 6.255. the 512-KB NVRAM is sufficient for storing VACLs and QoS ACLs. Prior to this feature. 1 packets This example shows how to display the flow information in the log table: Console> (enable) show security acl log flow ip any any Total matched entry number = 1 Entry No. Console> (enable) This example shows how to map the VACL to a VLAN: Console> (enable) set security acl map my_cap 1 Mapping in progress.0. all ACL configurations are stored in NVRAM by default.0. IP Packet ---------------------------------------Vlan Number : 1 Mod/Port Number : 2/1 Source IP address : 21. 7 packets 2000 Jul 19 01:25:06 %ACL-6-VACLLOG:VLAN 1(Port 2/2) denied ip tcp 21.0.255.1 Destination IP address : 255. : : 2000 Jul 19 01:14:06 %ACL-6-VACLLOG:VLAN 1(Port 2/1) denied ip tcp 21.0.255.1(2000) -> 255. In addition to limiting ACL configuration. therefore.1(2000) -> 255. Console> (enable) Configuring and Storing VACLs and QoS ACLs in Flash Memory This section describes how to configure and store VACLs and QoS ACLs in Flash memory instead of NVRAM. Console> (enable) This example shows how to commit the my_cap ACL to NVRAM: Console> (enable) commit security acl my_cap ACL commit in progress. Note In most cases. NVRAM could become full. With the addition of QoS and security ACLs (VACLs).255. #1.0. filling up NVRAM can cause problems when you attempt to upgrade from one software version to another. 1 packet 2000 Jul 19 01:19:06 %ACL-6-VACLLOG:VLAN 1(Port 2/1) denied ip tcp 21. ACL my_cap successfully committed.255 TCP Source port : 2000 TCP Destination port : 3000 Received Packet Number : 10 This example shows how to clear the log table: Console> (enable) clear security acl log flow Log table is cleared. ACL my_cap successfully mapped to VLAN 1.1 log my_cap editbuffer modified.255.255.1(2000) -> 255. Use ’commit’ command to apply changes.255.Chapter 16 Configuring and Storing VACLs and QoS ACLs in Flash Memory Configuring Access Control This example shows how to create an ACE for my_cap and specify that denied traffic be logged: Console> (enable) set security acl ip my_cap deny ip host 21.255(3000).255(3000).3 and 6. all configuration information was stored in NVRAM.255.0.0.4 16-42 78-13315-02 .

page 16-xlvi Moving the VACL and QoS ACL Configuration Back to NVRAM. If you receive these error messages. you might try to delete unneeded VACLs and QoS ACLs and save the ACL configuration to NVRAM using the set config acl nvram command. When this occurs.Chapter 16 Configuring Access Control Configuring and Storing VACLs and QoS ACLs in Flash Memory This section describes the following tasks: • • • • • • Automatically Moving the VACL and QoS ACL Configuration to Flash Memory. Catalyst 6000 Family Software Configuration Guide—Releases 6. the VACL and QoS ACL configuration is stored in DRAM only. page 16-xlvi Redundancy Synchronization Support. page 16-xliv Manually Moving the VACL and QoS ACL Configuration to Flash Memory. The VACL and QoS ACL configuration has now been successfully moved to Flash memory. page 16-xlvi Interacting with High Availability. the system also does the following: • • Sets the CONFIG_FILE variable to bootflash:switchapp. these syslog messages display: 1999 Sep 01 17:00:00 %SYS-1-CFG_FLASH:ACL configuration moved to bootflash:switchapp. “Modifying the Switch Boot Configuration. page 16-xliv Running with the VACL and QoS ACL Configuration in Flash Memory. append. Qos/Security ACL configuration deleted from NVRAM.cfg Enables the set boot config-register auto-config command recurring. page 16-xlvii Note See Chapter 23.3 and 6.cfg 1999 Sep 01 17:00:00 %SYS-1-CFG_ACL_DEALLOC:NVRAM full. Qos/Security ACL configuration deleted from NVRAM. If there is not enough NVRAM to perform a software upgrade. Alternatively. and sync options If an error occurs during the upgrade. During this process.” for additional information on using the commands described in this section.4 78-13315-02 16-43 . the QoS ACL and VACL configuration is deleted from NVRAM and the ACL configuration is automatically moved to Flash memory.cfg 1999 Sep 01 17:00:00 %SYS-1-CFG_ACL_DEALLOC:NVRAM full. these syslog messages display: 1999 Sep 01 17:00:00 %SYS-1-CFG_FLASH_ERR:Failed to write ACL configuration to bootflash:switchapp. Automatically Moving the VACL and QoS ACL Configuration to Flash Memory Moving the VACL and QoS ACL configuration to Flash memory is done automatically only during system software upgrades and then only if there is not sufficient NVRAM for the upgrade. You need to make more space available in Flash memory and then save the configuration to Flash memory (as described in the “Moving the VACL and QoS ACL Configuration Back to NVRAM” section on page 16-xlvi).

Catalyst 6000 Family Software Configuration Guide—Releases 6. append. sync enabled console baud: 9600 boot: image specified by the boot system commands Console> (enable) Step 5 Save committed VACL and QoS ACL configuration changes to the auto-config file. you can manually move the VACL and QoS ACL configuration to Flash memory as follows: Step 1 Specify the VACL and QoS ACL auto-config file to use to configure the switch at startup.3 and 6.cfg Console> (enable) Step 2 Specify if the switch should retain (recurring keyword) or clear (non-recurring keyword) the contents of the CONFIG_FILE environment variable after a reset or power cycle.4 16-44 78-13315-02 .Chapter 16 Configuring and Storing VACLs and QoS ACLs in Flash Memory Configuring Access Control Manually Moving the VACL and QoS ACL Configuration to Flash Memory If your VACL and QoS ACL configuration requirements require more memory than the 512-KB NVRAM.cfg Upload ACL configuration to bootflash:switchapp. Console> (enable) set boot config-register auto-config recurring Configuration register is 0x12F ignore-config: disabled auto-config: recurring. proceed (y/n) [n]? y ACL configuration has been copied successfully. With synchronization enabled. Console> (enable) Step 6 Delete the VACL and QoS ACL configuration from NVRAM. append. sync disabled console baud: 9600 boot: image specified by the boot system commands Console> (enable) Step 3 Specify if the auto-config file should be used to overwrite the NVRAM configuration or be appended to what is currently in NVRAM. Console> (enable) set boot auto-config bootflash:switchapp. Console> (enable) set boot config-register auto-config append Configuration register is 0x12F ignore-config: disabled auto-config: recurring. sync disabled console baud: 9600 boot: image specified by the boot system commands Console> (enable) Step 4 Specify if synchronization should be enabled or disabled. Warning: Use the copy commands to save the ACL configuration to a file and the ’set boot config-register auto-config’ commands to configure the auto-config feature.cfg CONFIG_FILE variable = bootflash:switchapp. the auto-config file(s) synchronize automatically to the standby supervisor engine. Console> (enable) copy acl-config bootflash:switchapp.cfg 2843644 bytes available on device bootflash. Console> (enable) set boot config-register auto-config sync enable Configuration register is 0x12F ignore-config: disabled auto-config: recurring. overwrite. Console> (enable) clear config acl nvram ACL configuration has been deleted from NVRAM.

Any changes made in NVRAM are lost. If you cannot write the VACL and QoS ACL configuration to Flash memory. the configuration from the auto-config file is appended to the NVRAM configuration.cfg and will be appended to the NVRAM configuration at system startup. the following syslog message displays: 1999 Sep 01 17:00:00 %SYS-0-CFG_FLASH_ERR:ACL configuration set to flash but no ACL configuration file found. You then only have to copy the VACL and QoS ACL configuration to this file after commit operations. and then try to write the VACL and QoS ACL configuration to Flash memory. You have to copy the configuration to the Flash file manually as follows: • If you use the set boot config-register auto-config append option. If the VACL and QoS ACL configuration is in Flash memory and you use the mapping commands.cfg command to save the configuration to the auto-config file. You should always copy your entire configuration (not just the VACL and QoS ACL configuration) to the auto-config file when you want to save it. After making any additional changes to the VACL and QoS ACL configuration and committing those changes. the VACL and QoS ACL configuration is no longer in NVRAM. you need to enter the copy command to save the configuration to Flash memory. the VACL and QoS ACL configuration exists in DRAM only.3 and 6. it is saved in the auto-config file bootflash:switchapp. Note If you cannot write the configuration to Flash memory. At system startup. At this point. The auto-config file is synchronized automatically to the standby supervisor engine because synchronization was enabled. If you do not use the set boot config-register auto-config append option. Running with the VACL and QoS ACL Configuration in Flash Memory After you move the VACL and QoS ACL configuration to Flash memory.Chapter 16 Configuring Access Control Configuring and Storing VACLs and QoS ACLs in Flash Memory Note VACL and QoS ACL mapping commands (set qos acl map and set security acl map) are also stored in the auto-config file. At this point. if the VACL and QoS ACL configuration location is set to Flash memory but either the CONFIG_FILE variable is not set or none of the files specified exist. • Catalyst 6000 Family Software Configuration Guide—Releases 6. make additional room available in Flash memory. you must enter the copy acl-config bootflash:switchapp. A system reset for any reason can cause the VACL and QoS ACL configuration to revert to the default. it is removed from NVRAM. QoS ACLs and VACL commit operations are no longer written to NVRAM. you must copy the configuration to a file.4 78-13315-02 16-45 . the auto-config feature clears the configuration before executing the auto-config file at system startup.

Interacting with High Availability After a supervisor engine switchover. Similarly. if the VACL and QoS ACL configuration resides in Flash memory. it is not applicable to Layer 2 traffic. the auto-config file on the active supervisor engine is automatically synchronized to the standby supervisor engine whenever a change is made. just as in the case where the VACL and QoS ACL configuration is saved in NVRAM. Note PBF does not support Internetwork Packet Exchange (IPX) and multicast traffic. Configuring Policy-Based Forwarding The policy-based forwarding (PBF) feature is an extension of VACL redirection supported by the Policy Feature Card 2 (PFC2). the active supervisor engine automatically synchronizes the auto-config file. all 802.4 16-46 78-13315-02 . The only difference is that the data is stored in DRAM.Chapter 16 Configuring Policy-Based Forwarding Configuring Access Control Moving the VACL and QoS ACL Configuration Back to NVRAM This example shows how to move the VACL and QoS ACL configuration back to NVRAM: Console> (enable) set config acl nvram ACL configuration copied to NVRAM. or where firewall load balancing is performed. It can prove to be particularly beneficial in any flat Layer 2 network used for transparent bridging where a limited amount of inter-VLAN communication is required. At the intermediate (PBF) switch. Console> (enable) Console> (enable) clear boot auto-config CONFIG_FILE variable = Console> (enable) Redundancy Synchronization Support The set boot commands contain an option to synchronize the auto-config file automatically. the VACL and QoS ACL configuration on the standby supervisor engine is consistent with what was on the active supervisor engine. Note PBF does not work with 802. deleting the auto-config file on the active supervisor engine causes the file to be deleted on the standby supervisor engine.3 and 6. Catalyst 6000 Family Software Configuration Guide—Releases 6. Note PBF may require some configuration on attached hosts. for example. but the functional behavior of a switchover does not change. PBF is supported on Layer 3 IP unicast traffic.1Q tunnel traffic appears as Layer 2 traffic. When you enable the auto-config option. if you insert a new standby supervisor engine. ARP table entries have to be statically added on each host participating in PBF. When a router is not present in the network. This feature can also be used in server farms or DMZs where bridging devices like server load balancing appliances are involved.1Q tunnel traffic.

it hits the PBF VACL. a rewritten packet could hit a deny statement in the outgoing VACL and be dropped. page 16-xlviii Configuring Policy-Based Forwarding. the system responds with a message indicating the feature is not supported with an MSFC2. If you try to configure PBF with an MSFC2 present and booted. the PFC2 treats the packets as Layer 2 packets. you can configure PBF. The PFC2 must think the packet is a Layer 3 packet or no rewrite operation occurs. When the packet from the source VLAN comes into the PFC2. The MAC address can be a default or user-specified MAC address.Chapter 16 Configuring Access Control Understanding How Policy-Based Forwarding Works PBF is described in these sections: • • • • Understanding How Policy-Based Forwarding Works. page 16-xlvii Hardware and Software Requirements. When a router is not present in the network.3(1) or later releases. If the VACLs are not specific. Based on the information provided in the adjacency table. You must set VACLs on both VLANs that participate in PBF. • PBF requires supervisor engine software release 6.4 78-13315-02 16-47 . PBF is not supported with an operating (booted) Multilayer Switch Feature Card 2 (MSFC2) in the Catalyst 6000 family switch that is being used for PBF. Catalyst 6000 Family Software Configuration Guide—Releases 6. Packets have to be sent with the destination MAC address equal to the PFC2 MAC address. you need to specify static ARP entries on participating hosts. The packets are forwarded between VLANs only if they hit the VACL entries that are associated with the adjacency information. If an MSFC2 is present but has not booted. page 16-lvi Understanding How Policy-Based Forwarding Works PBF configuration involves these steps: • • • Enabling PBF and specifying a MAC address for the PFC2 Configuring VACLs for PBF Configuring attached hosts for PBF You enable PBF by specifying a MAC address for the PFC2. The PBF VACL contains an adjacency table entry for the PFC2 and a redirect ACE. page 16-xlviii Policy-Based Forwarding Configuration Example. The PBF VACL is created using the security ACL (VACL) commands (set security acl commands). Hardware and Software Requirements PBF hardware and software requirements are as follows: • • PBF requires Supervisor Engine 2 with the Policy Feature Card 2 (PFC2) (WS-X6K-S2-PFC2). Note Because VACLs are applied to incoming and outgoing traffic. the packet header is rewritten (destination VLAN and source and destination MAC addresses) and the packet is forwarded to the destination VLAN. If packets are not sent with the PFC2 MAC address. you must configure all VACLs carefully when using PBF.3 and 6.

Chapter 16 Configuring Policy-Based Forwarding Configuring Access Control Configuring Policy-Based Forwarding This section provides guidelines and configuration examples for PBF. page 16-lii Clearing Entries in PBF VACLs. The configuration examples use the example configuration shown in Figure 8.1 MAC 00:00:00:00:00:0B Interface: Ethernet0 78-13315-02 . page 16-liii Rolling Back Adjacency Table Entries in the Edit Buffer. packets might get dropped. When you specify your own MAC address using the set pbf mac command.4 16-48 58995 Host A IP 10.1 MAC 00:00:00:00:00:0A Interface: Ethernet1 Host B IP 11. and redirects traffic from Host B to Host A. This section contains the following example procedures: • • • • • • Enabling PBF and Specifying a MAC Address for the PFC2. page 16-xlix Configuring VACLs for PBF.0.0. ensure that the MAC address is unique and not already being used on any interfaces. When specifying a MAC address using the set pbf mac command. Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6. The Catalyst 6000 family switch redirects all the traffic coming from Host A on VLAN 10 to Host B on VLAN 11. We recommend that you use the default MAC address provided by the MAC address PROM.0. page 16-l Displaying PBF Information. page 16-liv Configuring Hosts for PBF. page 16-liv Figure 16-8 Policy-Based Forwarding Catalyst 6500 series switches PFC2 MAC address: 00-11-11-11-11-11 VLAN 10 VLAN 11 Enabling PBF and Specifying a MAC Address for the PFC2 Note The MAC address can be a default or user-specified MAC address.0. if the MAC address is a duplicate of a MAC address already in use. The default MAC address is taken from a MAC address PROM on the Catalyst 6000 family switch chassis.

Command show pbf To enable PBF. Command set pbf set pbf [mac mac address] This example shows how to check PBF status and MAC address. Console> (enable) Console> (enable) show pbf Pbf status Mac address ---------------------------ok 00-01-64-61-39-c2 Console> (enable) This example shows how to enable PBF with a specific MAC address: Console> (enable) set pbf mac 00-11-11-11-11-11 PBF committed successfully. Operation successful. perform this task in privileged mode: Task Display PBF status and MAC address. Enable PBF with a specific MAC address.4 78-13315-02 16-49 . Operation successful. and verify the change: Console> (enable) show pbf Pbf status Mac address ---------------------------not set 00-00-00-00-00-00 Console> (enable) Console> (enable) set pbf PBF committed successfully. enable PBF with a default MAC address.Chapter 16 Configuring Access Control Configuring Policy-Based Forwarding To display PBF status and MAC address. perform this task in privileged mode: Task Disable PBF and clear the PBF MAC address. Console> (enable) Console> (enable) show pbf Pbf status Mac address ---------------------------ok 00-11-11-11-11-11 Console> (enable) To disable PBF and clear the PBF MAC address.3 and 6. Command clear pbf Catalyst 6000 Family Software Configuration Guide—Releases 6. perform one of these tasks in privileged mode: Task Enable PBF with a default MAC address.

Note To enable jumbo frame forwarding using PBF. Note You can combine steps 3 and 4 by entering the commit security acl all command. Commit the PBF VACL. Specify the redirect ACE in the PBF VACL that is using the adjacency table entry. Specify the adjacency table entry. the system defaults to the PBF MAC address. 2. Console> (enable) Console> (enable) show pbf Pbf status Mac address ---------------------------not set 00-00-00-00-00-00 Console> (enable) Configuring VACLs for PBF Note Enter the set security acl adjacency command to specify the rewrite information in the adjacency table that causes the packet header to be rewritten (destination VLAN and source and destination MAC addresses) and forwarded to the destination VLAN. Catalyst 6000 Family Software Configuration Guide—Releases 6.Chapter 16 Configuring Policy-Based Forwarding Configuring Access Control This example shows how to clear the PBF MAC address: Console> (enable) clear pbf PBF cleared. Commit the adjacency table entry. Note that the source MAC address is optional. 3.3 and 6. enter the mtu keyword in the set security acl adjacency command. The adjacency table entry has to be defined in the VACL before the redirect ACE because the redirect ACE uses it to redirect traffic. Note You can configure a maximum of 256 adjacency table entries for a VLAN. 5. Note The same adjacency table entry can be used by more than one redirect ACE. If you do not specify the source MAC address. 4. The maximum number of adjacency table entries is 1023. The order of entries in a PBF VACL is important. Map the PBF VACL to a single VLAN or multiple VLANs.4 16-50 78-13315-02 . You should create entries for PBF VACLs in the following order: 1.

Console> (enable) set security acl map IPACL2 11 Mapping in progress.1 IPACL2 editbuffer modified. Use 'commit' command to apply changes. Use 'commit' command to apply changes.3 and 6.1 host 11. Console> (enable) commit security acl adjacency Commit operation in progress. Console> (enable) set security acl ip IPACL1 redirect ADJ1 ip host 10. Console> (enable) This example shows how to create the PBF VACL for VLAN 11 (see Figure 8): Console> (enable) set security acl adjacency ADJ2 10 00-00-00-00-00-0A ADJ2 editbuffer modified. Console> (enable) This example shows how to create the PBF VACL for VLAN 10 (shown in Figure 8): Console> (enable) set security acl adjacency ADJ1 11 00-00-00-00-00-0B ADJ1 editbuffer modified. Adjacency successfully committed. Use 'commit' command to apply changes.0. Adjacency successfully committed. Use 'commit' command to apply changes. Console> (enable) set security acl ip IPACL2 redirect ADJ2 ip host 11. Command set security acl adjacency adjacency_name dest_vlan dest_mac [[source_mac] | [source_mac mtu mtu_size] | [ mtu mtu_size]] This example shows how to specify the adjacency table entry: Console> (enable) set security acl adjacency ADJ1 11 00-00-00-00-00-0B ADJ1 editbuffer modified. ACL 'IPACL2' successfully committed.0.Chapter 16 Configuring Access Control Configuring Policy-Based Forwarding To specify an adjacency table entry for the PFC2.0.4 78-13315-02 16-51 . Console> (enable) commit security acl IPACL1 ACL commit in progress. Console> (enable) set security acl map IPACL1 10 Mapping in progress. Console> (enable) set security acl ip IPACL1 permit any IPACL1 editbuffer modified. perform this task in privileged mode: Task Specify an adjacency table entry for the PFC2. ACL IPACL1 successfully mapped to VLAN 10.1 IPACL1 editbuffer modified.0. Console> (enable) commit security acl IPACL2 ACL commit in progress.0.0. Use 'commit' command to apply changes.0. Console> (enable) commit security acl adjacency Commit operation in progress. Console> (enable) set security acl ip IPACL2 permit any IPACL2 editbuffer modified. Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. Use 'commit' command to apply changes.1 host 10. ACL IPACL2 successfully mapped to VLAN 11. ACL 'IPACL1' successfully committed.0. Use 'commit' command to apply changes.

To display adjacency table entries. Clear the redirect ACE.-------------------ADJ1 IPACL1 ADJ2 Console> (enable) IPACL2 Clearing Entries in PBF VACLs The adjacency table entry cannot be cleared before the redirect ACE.4 16-52 78-13315-02 .Chapter 16 Configuring Policy-Based Forwarding Configuring Access Control Displaying PBF Information This section describes how to display PBF-related information. Display PBF adjacency information for all adjacency table entries or a specific adjacency table entry. 10 00-00-00-00-00-0a Console> show pbf adjacency Index DstVlan DstMac SrcMac Name -----------------------------------------------------------------1 11 00-00-00-00-00-0a 00-00-00-00-00-0b ADJ1 2 10 00-00-00-00-00-0a 00-00-00-00-00-0b ADJ2 Console> show pbf statistics Index DstVlan DstMac SrcMac HitCount(hex) Name ------------------------------------------------------------------------1 11 00-00-00-00-00-0a 00-00-00-00-00-0b 0x00000000 ADJ1 2 10 00-00-00-00-00-0a 00-00-00-00-00-0b 0x00000000 ADJ2 Console> show pbf map Adjacency ACL -----------------. Catalyst 6000 Family Software Configuration Guide—Releases 6. Commit the PBF VACL. Command show security acl info [acl_name | adjacency | all] [editbuffer [editbuffer_index]] show pbf adjacency [adj name] show pbf statistics [adj name] Display the adjacency-to-VACL mappings for all show pbf map [adj name] adjacency table entries or a specific adjacency table entry. 2. 11 00-00-00-00-00-0b set security acl adjacency ADJ2 --------------------------------------------------1. Display PBF statistics for all adjacency table entries or a specific adjacency table entry. perform these tasks in normal mode: Task Display adjacency table entries. You should clear the redirect ACE and the adjacency table entry in PBF VACLs in the following order: 1. Console> show security acl info adjacency set security acl adjacency ADJ1 --------------------------------------------------1.3 and 6.

page 16-lv MS-Windows/NT/2000 Hosts. Command rollback security acl {acl_name | all | adjacency} This example shows how to roll back adjacency table entries in the edit buffer: Console> (enable) rollback security acl adjacency Editbuffer for adjacency info rolled back to last commit state. page 16-lv Catalyst 6000 Family Software Configuration Guide—Releases 6. Console> (enable) clear security acl adjacency ADJ1 ADJ1 editbuffer modified. Command clear security acl adjacency adj name This example shows how to clear a PBF adjacency table entry: Console> (enable) clear security acl adjacency ADJ1 Adj is in use by a VACL. Use 'commit' command to apply changes. perform this task in privileged mode: Task Roll back adjacency table entries in the edit buffer. Console> (enable) clear security acl IPACL1 IPACL1 editbuffer modified. Clear the adjacency table entry. To roll back the adjacency table entries in the edit buffer. page 16-liv Sun Workstation. 4. Commit the adjacency table entry. Console> (enable) Configuring Hosts for PBF This section provides host configuration procedures for the following platforms and operating systems: • • • Linux.4 78-13315-02 16-53 . clear the VACL first then clear adj. To clear a PBF adjacency table entry.Chapter 16 Configuring Access Control Configuring Policy-Based Forwarding 3. Console> (enable) commit security acl adjacency Console> (enable) Adjacency committed successfully Commit operation in progress. Console> (enable) commit security acl IPACL1 ACL commit in progress. Use 'commit' command to save changes. The adjacency table entries are rolled back to their state at the last commit.3 and 6. ACL 'IPACL1' successfully deleted. Console> (enable) Rolling Back Adjacency Table Entries in the Edit Buffer You can clear adjacency table entries in the edit buffer that were made prior to the last commit by using the rollback command. perform this task in privileged mode: Task Clear a PBF adjacency table entry.

0.1 is the IP address of the destination host.0.0.0. note that there are limitations you must take into account when configuring the hosts. The host’s ARP table maps the IP address of the host device to the MAC address of the PFC2. and if required.0. The IP address of the gateway is one of the host addresses within that network as follows: (A)Kubera# arp -s 10. Note The IP addresses in the following examples are the IP addresses used in Figure 8.2 00:11:11:11:11:11 (B)Kubera# route add host 11.4 16-54 78-13315-02 .1 00:11:11:11:11:11 -i eth1 route add 10.0. Each static ARP entry must point to the PBF MAC address that is mapped to the destination host. you must set a static ARP entry on each Sun Workstation that participates in PBF. You must also configure the Sun Workstation to have a gateway. For example.2 Catalyst 6000 Family Software Configuration Guide—Releases 6. the static ARP entry would be as follows: arp -s 11.0.1 eth0 This example shows how to configure Host B: arp -s 10. This is a limitation of ARP in all Sun Workstations.1 10.0. and 11.0.3 and 6.0. you need to specify static ARP entries on participating hosts.0. make sure that the IP addresses you use in your network configuration are unique.0. and set a static ARP entry pointing to the PBF MAC address mapped to the destination host. Sun Workstation Limitations Sun Workstations do not allow you to set a static ARP entry if the destination is part of a different network (11.0. Linux These examples show how to configure the ARP table for hosts running the Linux operating system.0.1 on VLAN 50. PBF Limitations PBF does not support ARP. These IP addresses were randomly selected.1 eth1 Sun Workstation When using PBF to enable forwarding between two VLANs with Sun Workstation end hosts. Using the example above. you must define the host routes for all networks that go through PBF.1 00:11:11:11:11:11 -i eth0 route add 11. To overcome this problem.x. you need to first define a dummy static ARP entry for the gateway.0.1 00:11:11:11:11:11 where 00-11-11-11-11-11 is the PBF MAC address. if host 10.0.0.Chapter 16 Configuring Policy-Based Forwarding Configuring Access Control Note When a router is not present in the network.0.0. you need to define a dummy gateway.x in this example). and assuming the PBF MAC address is 00-11-11-11-11-11. This example shows how to configure Host A: arp -s 11.0.0.1 on VLAN 40 needs to communicate with host 11.x. If the Sun Workstation needs to communicate to a different network. which is a host route. you must define a default gateway.0.

You can create the file in a directory that has full permissions for the root/superuser.d directory itself.0. Setting up this file prevents you from having to key in all the host route entries after the Workstation is reset or rebooted.d which has host route entries for each of the destination hosts.4 78-13315-02 16-55 . For Windows-based PCs. set a soft link pointing to that file in /etc/rc2.3 and 6.0.0.1 is the IP address of the destination host. If you need to configure more hosts.Chapter 16 Configuring Access Control Configuring Policy-Based Forwarding You need to set only one dummy ARP entry for PBF-related traffic and the host routes for each destination host. or create the file in the /etc/rc2. Policy-Based Forwarding Configuration Example This section provides example configurations to enable PBF between hosts on VLAN 1 and hosts on VLAN 2 (see Figure 9). you do not need to set up any dummy gateways for switching between VLANs with PBF. you need to set the host route entries for each destination host.0. Entries in the file should use this form: Route add host <destination Host IP Address> <dummy gateway IP Address> The file that contains the host route entries needs to be started as one of the startup scripts. If the number of hosts increase.d. Catalyst 6000 Family Software Configuration Guide—Releases 6. MS-Windows/NT/2000 Hosts Similar to Sun Workstations setup. you must also set static ARP entries on Windows-based PCs. This example shows how to configure static ARP entries in Windows-based platforms: C:\> arp -s 11. 00-11-11-11-11-11 is the PBF MAC address and 11.1 00-11-11-11-11-11 In this example. you can create a batch file with ARP entries to each destination host and specify that Windows use this file at startup. You can set up a startup file in /etc/rc2.

4 set security acl ip ip2 permit ip any any #pbf set set pbf mac 00-11-22-33-44-55 # commit security acl all set security acl map ip1 1 set security acl map ip2 2 host host host host 43.44.0.0.17 MAC:00-20-20-20-20-20 00:20:20:20:20:2f Interface: Port 4/1 VLAN 2 Hosts IP: 43.0.0.2 set security acl ip ip1 redirect a_3 ip host 44.4 set security acl ip ip1 permit ip any any #ip2 set security acl ip ip2 permit arp set security acl ip ip2 redirect b_1 ip host 43.3 and 6.0.1 set security acl ip ip1 redirect a_2 ip host 44.0.0.4 16-56 58974 78-13315-02 .0.0.2 set security acl ip ip2 redirect b_3 ip host 43.1 through 43.Chapter 16 Configuring Policy-Based Forwarding Configuring Access Control Figure 16-9 Policy-Based Forwarding Configuration Example Catalyst 6500 series switches PFC2 MAC address: 00-11-22-33-44-55 6/17 6/9 VLAN 1 VLAN 2 VLAN 1 Hosts IP: 44.0.0.1 44.1 43.0.0.2 43.0.0. #security ACLs clear security acl all #adj set set security acl adjacency a_1 2 00-0a-0a-0a-0a-0a set security acl adjacency a_2 2 00-0a-0a-0a-0a-0b set security acl adjacency a_3 2 00-0a-0a-0a-0a-0c set security acl adjacency a_4 2 00-0a-0a-0a-0a-0d set security acl adjacency b_1 1 00-20-20-20-20-20 set security acl adjacency b_2 1 00-20-20-20-20-21 set security acl adjacency b_3 1 00-20-20-20-20-22 set security acl adjacency b_4 1 00-20-20-20-20-23 #ip1 set security acl ip ip1 permit arp set security acl ip ip1 redirect a_1 ip host 44.0.0.0.1 .4 Catalyst 6000 Family Software Configuration Guide—Releases 6.0.1 set security acl ip ip2 redirect b_2 ip host 43.3 set security acl ip ip2 redirect b_4 ip host 43.4).0.0.0.0.1 .2 44.0.0.0.0.0.0. Only the first four hosts from each VLAN are shown in the example (44.0.0.17 MAC:00-0a-0a-0a-0a-0a 00:0a:0a:0a:0a:19 Interface: Port 4/2 This example shows the switch configuration file that was created to enable PBF between the hosts on VLAN 1 and VLAN 2.0.43.0.0.3 44.4 host host host host 44.0.0.0.0.0.0.0.0.0.4 and 43.3 set security acl ip ip1 redirect a_4 ip host 44.0.1 through 44.0.0.0.3 43.0.

------------------------------------------00-0a-0a-0a-0a-0e 6/9 [ALL] 00-0a-0a-0a-0a-0f 6/9 [ALL] 00-0a-0a-0a-0a-0c 6/9 [ALL] 00-0a-0a-0a-0a-0d 6/9 [ALL] 00-0a-0a-0a-0a-0a 6/9 [ALL] 00-0a-0a-0a-0a-0b 6/9 [ALL] 00-0a-0a-0a-0a-19 6/9 [ALL] 00-0a-0a-0a-0a-18 6/9 [ALL] 00-0a-0a-0a-0a-17 6/9 [ALL] 00-0a-0a-0a-0a-16 6/9 [ALL] 00-0a-0a-0a-0a-15 6/9 [ALL] 00-0a-0a-0a-0a-14 6/9 [ALL] 00-0a-0a-0a-0a-13 6/9 [ALL] 00-0a-0a-0a-0a-12 6/9 [ALL] 00-0a-0a-0a-0a-11 6/9 [ALL] 00-0a-0a-0a-0a-10 6/9 [ALL] Matching CAM Entries Displayed for 6/9 = 16 Catalyst 6000 Family Software Configuration Guide—Releases 6.------------------------------------------00-20-20-20-20-23 6/17 [ALL] 00-20-20-20-20-22 6/17 [ALL] 00-20-20-20-20-21 6/17 [ALL] 00-20-20-20-20-20 6/17 [ALL] 00-20-20-20-20-27 6/17 [ALL] 00-20-20-20-20-26 6/17 [ALL] 00-20-20-20-20-25 6/17 [ALL] 00-20-20-20-20-24 6/17 [ALL] 00-20-20-20-20-2b 6/17 [ALL] 00-20-20-20-20-2a 6/17 [ALL] 00-20-20-20-20-29 6/17 [ALL] 00-20-20-20-20-28 6/17 [ALL] 00-20-20-20-20-2f 6/17 [ALL] 00-20-20-20-20-2e 6/17 [ALL] 00-20-20-20-20-2d 6/17 [ALL] 00-20-20-20-20-2c 6/17 [ALL] Matching CAM Entries Displayed for 6/17 = 16 for port 6/9. X = Port Security Entry $ = Dot1x Security Entry VLAN ---1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Total Dest MAC/Route Des [CoS] Destination Ports or VCs / [Protocol Type] ---------------------. R = Router Entry. X = Port Security Entry $ = Dot1x Security Entry VLAN ---2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 Total Dest MAC/Route Des [CoS] Destination Ports or VCs / [Protocol Type] ---------------------. # = System Entry. + = Permanent Entry. vlan 2 This example shows how to display MAC addresses learned by the switch for port 6/9 on VLAN 2: Console> (enable) show cam dynamic 6/9 * = Static Entry.Chapter 16 Configuring Access Control Configuring Policy-Based Forwarding This example shows how to display MAC addresses learned by the switch for port 6/17 on VLAN 1: Console> (enable) show cam dynamic 6/17 * = Static Entry.3 and 6.4 78-13315-02 16-57 . + = Permanent Entry. # = System Entry. R = Router Entry.

Chapter 16 Configuring Policy-Based Forwarding Configuring Access Control This example shows how to display the PBF status and the PFC2 MAC address: Console> (enable) show pbf Pbf status Mac address ---------------------------ok 00-11-22-33-44-55 This example shows how to display the PBF statistics: Console> (enable) show pbf statistics Index DstVlan DstMac SrcMac HitCount(hex) Name ------------------------------------------------------------------------1 2 00-0a-0a-0a-0a-0a 00-11-22-33-44-55 0x00026d7c a_1 2 2 00-0a-0a-0a-0a-0b 00-11-22-33-44-55 0x00026d83 a_2 3 2 00-0a-0a-0a-0a-0c 00-11-22-33-44-55 0x00026d89 a_3 4 2 00-0a-0a-0a-0a-0d 00-11-22-33-44-55 0x00026d90 a_4 5 1 00-20-20-20-20-20 00-11-22-33-44-55 0x000260e3 b_1 6 1 00-20-20-20-20-21 00-11-22-33-44-55 0x000260ea b_2 7 1 00-20-20-20-20-22 00-11-22-33-44-55 0x000260f1 b_3 8 1 00-20-20-20-20-23 00-11-22-33-44-55 0x000260f8 b_4 Catalyst 6000 Family Software Configuration Guide—Releases 6.4 16-58 78-13315-02 .3 and 6.

page 17-ii Configuring GVRP. With GVRP. Catalyst 6000 Family Software Configuration Guide—Releases 6. the switch can exchange VLAN configuration information with other GVRP switches.1Q-compliant VLAN pruning and dynamic VLAN creation on 802.C H A P T E R 17 Configuring GVRP This chapter describes how to configure the Generic Attribute Registration Protocol (GARP) VLAN Registration Protocol (GVRP) on the Catalyst 6000 family switches.1p. refer to the Catalyst 6000 Family Command Reference publication. page 17-i Default GVRP Configuration. page 17-ii Note GVRP requires supervisor engine software release 5. Note GARP and GVRP are industry-standard protocols described in IEEE 802. prune unnecessary broadcast and unknown unicast traffic.1Q trunk ports.2 or later releases.1Q trunk ports. Note For complete syntax and usage information for the commands used in this chapter. and dynamically create and manage VLANs on switches connected through 802. Understanding How GVRP Works GVRP is a GARP application that provides IEEE 802. This chapter consists of these sections: • • • • Understanding How GVRP Works. page 17-ii GVRP Configuration Guidelines.4 78-13315-02 17-1 .3 and 6.

page 17-ix Catalyst 6000 Family Software Configuration Guide—Releases 6. You must enable GVRP on both ends of an 802.1Q Trunk Ports. page 17-vi Setting the GARP Timers. page 17-viii Disabling GVRP Globally.1Q-capable ports. Configuring GVRP These sections describe how to configure GVRP: • • • • • • • • • • Enabling GVRP Globally. for all ports normal (ports do not declare VLANs when in the STP1 blocking state) • • • Join time: 200 ms Leave time: 600 ms Leaveall time: 10.000 ms 1. page 17-v Configuring GVRP VLAN Declarations from Blocking Ports. with VLAN 1 set to fixed.1Q trunk link.Chapter 17 Default GVRP Configuration Configuring GVRP Default GVRP Configuration Table 1 shows the default GVRP configuration.1Q trunks on which GVRP is enabled. STP = Spanning Tree Protocol GVRP Configuration Guidelines Follow these guidelines when configuring GVRP: • • • • You can configure the per-port GVRP state only on 802. The GVRP registration mode for VLAN 1 is always fixed and is not configurable. page 17-iii Enabling GVRP on Individual 802.3 and 6.4 17-2 78-13315-02 . When VTP pruning is enabled. it runs on all GVRP-disabled 802.1Q trunk ports.1Q Trunk Ports. page 17-viii Disabling GVRP on Individual 802. page 17-iii Enabling GVRP Dynamic VLAN Creation. VLAN 1 is always carried by 802. Table 17-1 GVRP Default Configuration Feature GVRP global enable state GVRP per-trunk enable state GVRP dynamic creation of VLANs GVRP registration mode GVRP applicant state GARP timers Default Value Disabled Disabled on all ports Disabled normal. page 17-viii Clearing GVRP Statistics. page 17-iv Configuring GVRP Registration. page 17-vii Displaying GVRP Statistics.

7/1-24. However.1Q Trunk Ports” section on page 17-iii. Enabling GVRP globally enables GVRP to perform VLAN pruning on 802. Verify the configuration.Chapter 17 Configuring GVRP Configuring GVRP Enabling GVRP Globally You must enable GVRP globally before any GVRP processing occurs on the switch.8/1-24 Enabled Normal GVRP Participants running on 3/7-8. regardless of the global GVRP enable state or whether the port is an 802. in order for the port to become an active GVRP participant.4 78-13315-02 17-3 . either through CLI configuration or Dynamic Trunking Protocol (DTP) negotiation. you must enable GVRP globally and the port must be an 802. GVRP will not function on any ports until you enable it globally. GVRP dynamic VLAN creation is disabled.3 and 6.1Q Trunk Ports Note You can change the per-trunk GVRP configuration regardless of whether GVRP is enabled globally. To enable dynamic VLAN creation. For information on enabling dynamic VLAN creation.-----------2/1-2. However.3/1-8.1Q trunk links. see the “Enabling GVRP Globally” section on page 17-iii. For information on configuring GVRP globally on the switch.1Q-capable switch ports.----------. Console> Enabling GVRP on Individual 802. see the “Enabling GVRP on Individual 802.1Q trunk port. This example shows how to enable GVRP and verify the configuration: Console> (enable) set gvrp enable GVRP enabled Console> (enable) show gvrp configuration Global GVRP Configuration: GVRP Feature is currently enabled on the switch. For information on setting the per-trunk port GVRP enable state. There are two per-port GVRP states: • • The static GVRP state configured in the command-line interface (CLI) and stored in NVRAM The actual GVRP state of the ports (active GVRP participants) You can configure the static GVRP port-state on any 802. perform this task in privileged mode: Task Step 1 Step 2 Command set gvrp enable show gvrp configuration Enable GVRP on the switch. Catalyst 6000 Family Software Configuration Guide—Releases 6. GVRP Timers(milliseconds) Join = 200 Leave = 600 LeaveAll = 10000 Port based GVRP Configuration: Port GVRP Status Registration ------------------------------------------------------. you must explicitly enable dynamic VLAN creation globally on the switch as well. To enable GVRP globally on the switch. Pruning occurs only on GVRP-enabled trunks. see the “Enabling GVRP Dynamic VLAN Creation” section on page 17-iv.1Q trunk.

Note Dynamic VLAN creation supports all VLAN types. these configuration restrictions are imposed: • • You cannot change the switch to VTP server or client mode You cannot disable GVRP on a trunk port running GVRP If any port on the switch becomes an Inter-Switch Link (ISL) trunk (either by CLI configuration or negotiated using DTP) while dynamic VLAN creation is enabled.Chapter 17 Configuring GVRP Configuring GVRP To enable GVRP on individual 802. This example shows how to enable GVRP on 802. Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. Console> (enable) Enabling GVRP Dynamic VLAN Creation You can enable GVRP dynamic VLAN creation only if these conditions are met: • • • The switch is in VTP transparent mode All trunk ports on the switch are 802.1Q trunks in the normal registration mode. dynamic VLAN creation is disabled automatically until the conditions for enabling dynamic VLAN creation are restored.3 and 6.1Q-capable port 1/1: Console> (enable) set port gvrp 1/1 enable GVRP enabled on 1/1. Verify the configuration.1Q-capable ports.4 17-4 78-13315-02 . Verify the configuration.1Q-capable port. perform this task in privileged mode: Task Step 1 Step 2 Command set port gvrp mod/port enable show gvrp configuration Enable GVRP on an individual 802. perform this task in privileged mode: Task Command set gvrp dynamic-vlan-creation enable show gvrp configuration Step 1 Step 2 Enable dynamic VLAN creation on the switch. This example shows how to enable dynamic VLAN creation on the switch: Console> (enable) set gvrp dynamic-vlan-creation enable Dynamic VLAN creation enabled.1Q trunks (the trunk connection to an MSFC is exempt from this restriction) GVRP is enabled on all trunk ports If you enable dynamic VLAN creation. Note VLANs can only be created dynamically on 802. To enable GVRP dynamic VLAN creation on the switch.

1Q trunk port in normal registration mode allows dynamic creation (if dynamic VLAN creation is enabled). prevents VLAN deregistration. perform this task in privileged mode: Task Step 1 Step 2 Command Configure normal registration on an 802. To configure GVRP normal registration on an 802. Normal mode is the default. Verify the configuration. and registers all VLANs known on other ports on the trunk port. This example shows how to configure fixed registration on an 802. page 17-v Configuring GVRP Fixed Registration.1Q trunk port.1Q trunk port: Console> (enable) set gvrp registration fixed 1/1 Registrar Administrative Control set to fixed on port 1/1.1Q trunk port. perform this task in privileged mode: Task Step 1 Step 2 Command set gvrp registration fixed mod/port show gvrp configuration Configure fixed registration on an 802. registration.1Q trunk port: Console> (enable) set gvrp registration normal 1/1 Registrar Administrative Control set to normal on port 1/1.1Q trunk port in fixed registration mode allows manual creation and registration of VLANs.3 and 6. and deregistration of VLANs on the trunk port. show gvrp configuration This example shows how to configure normal registration on an 802. page 17-v Configuring GVRP Forbidden Registration. Console> (enable) Configuring GVRP Fixed Registration Configuring an 802.4 78-13315-02 17-5 . Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.Chapter 17 Configuring GVRP Configuring GVRP Configuring GVRP Registration These sections describe how to configure GVRP registration modes on switch ports: • • • Configuring GVRP Normal Registration.1Q trunk port. To configure GVRP fixed registration on an 802. page 17-vi Configuring GVRP Normal Registration Configuring an 802.1Q trunk set gvrp registration normal mod/port port. Verify the configuration.

Note Configuring fixed registration on the other device’s port also prevents undesirable STP topology reconfiguration.3 and 6.4/12-24. Verify the configuration.4/12-24 Applicant was set to active on port(s) 4/2-3.Chapter 17 Configuring GVRP Configuring GVRP Configuring GVRP Forbidden Registration Configuring an 802. perform this task in privileged mode: Task Configure an 802. Console> (enable) Use the normal keyword to return to the default state (active mode disabled).1Q trunk port in forbidden registration mode deregisters all VLANs (except VLAN 1) and prevents any further VLAN creation or registration on the trunk port.1Q trunk port to send VLAN declarations when in the blocking state.4 17-6 78-13315-02 . This example shows how to configure forbidden registration on an 802. Ports in the GVRP active applicant state send GVRP VLAN declarations when they are in the STP blocking state. configure the GVRP active applicant state on the port. Catalyst 6000 Family Software Configuration Guide—Releases 6. Command set gvrp applicant state {normal | active} mod/port This example shows how to configure a group of 802. Console> (enable) Configuring GVRP VLAN Declarations from Blocking Ports To prevent undesirable Spanning Tree Protocol (STP) topology reconfiguration on a port connected to a device that does not support Per-VLAN STP+ (PVST+).1Q trunk ports to send VLAN declarations when in the blocking state: Console> (enable) set gvrp applicant state active 4/2-3.4/9-10. perform this task in privileged mode: Task Step 1 Step 2 Command set gvrp registration forbidden mod/port show gvrp configuration Configure forbidden registration on an 802. To configure an 802. To configure GVRP forbidden registration on an 802.1Q trunk port.1Q trunk port to send VLAN declarations when in the blocking state.4/9-10.1Q trunk port. which prevents the STP bridge protocol data units (BPDUs) from being pruned from the other port.1Q trunk port: Console> (enable) set gvrp registration forbidden 1/1 Registrar Administrative Control set to forbidden on port 1/1.

) You can modify the default GARP timer values on the switch. Console> (enable) set garp timer join 200 GMRP/GARP join timer value is set to 200 milliseconds. To set the GARP timer values.3 and 6. GMRP and GVRP) do not operate successfully. the value for leave must be greater than three times the join value (leave >= join * 3). Set the leave timer to at least 1050 ms and then set the join timer to 350 ms. GMRP uses the same timers. This example shows how to set the GARP timers and verify the configuration: Console> (enable) set garp timer leaveall 10000 GMRP/GARP leaveAll timer value is set to 10000 milliseconds.-------------------------Join 200 Leave 600 LeaveAll 10000 Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. The aliases may be used if desired. Console> (enable) show garp timer Timer Timer Value (milliseconds) -------. For example. Note Modifying the GARP timer values affects the behavior of all GARP applications running on the switch. If you attempt to set a timer value that does not adhere to these rules. The value for leaveall must be greater than the value for leave (leaveall > leave). perform this task in privileged mode: Task Command set garp timer {join | leave | leaveall} timer_value show garp timer Step 1 Step 2 Set the GARP timer values. if you set the leave timer to 600 ms and you attempt to configure the join timer to 350 ms. not just GVRP.Chapter 17 Configuring GVRP Configuring GVRP Setting the GARP Timers Note The commands set gvrp timer and show gvrp timer are aliases for set garp timer and show garp timer. Verify the configuration. an error is returned. If the GARP timers are set differently on Layer 2-connected devices. GARP applications (for example. When setting the timer values. Caution Set the same GARP timer values on all Layer 2-connected devices. (For example. an error is returned.4 78-13315-02 17-7 . Console> (enable) set garp timer leave 600 GMRP/GARP leave timer value is set to 600 milliseconds.

3 and 6. Command show gvrp statistics [mod/port] This example shows how to display GVRP statistics for port 1/1: Console> (enable) show gvrp statistics 1/1 Join Empty Received: 0 Join In Received: 0 Empty Received: 0 LeaveIn Received: 0 Leave Empty Received: 0 Leave All Received: 40 Join Empty Transmitted: 156 Join In Transmitted: 0 Empty Transmitted: 0 Leave In Transmitted: 0 Leave Empty Transmitted: 0 Leave All Transmitted: 41 VTP Message Received: 0 Console> (enable) Clearing GVRP Statistics To clear all GVRP statistics on the switch. Verify the configuration. Command clear gvrp statistics {mod/port | all} This example shows how to clear all GVRP statistics on the switch: Console> (enable) clear gvrp statistics all GVRP Statistics cleared for all ports.Chapter 17 Configuring GVRP Configuring GVRP Displaying GVRP Statistics To display GVRP statistics on the switch.1Q Trunk Ports To disable GVRP on individual 802. Console> (enable) Disabling GVRP on Individual 802.1Q trunk port.4 17-8 78-13315-02 .1Q trunk ports. Catalyst 6000 Family Software Configuration Guide—Releases 6. perform this task: Task Display GVRP statistics. perform this task in privileged mode: Task Clear GVRP statistics. perform this task in privileged mode: Task Step 1 Step 2 Command set port gvrp disable mod/port show gvrp configuration Disable GVRP on an individual 802.

1Q trunk port 1/1: Console> (enable) set gvrp disable 1/1 GVRP disabled on 1/1. Console> (enable) Disabling GVRP Globally To disable GVRP globally on the switch. Command set gvrp disable This example shows how to disable GVRP globally on the switch: Console> (enable) set gvrp disable GVRP disabled Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. perform this task in privileged mode: Task Disable GVRP on the switch.3 and 6.4 78-13315-02 17-9 .Chapter 17 Configuring GVRP Configuring GVRP This example shows how to disable GVRP on 802.

Chapter 17 Configuring GVRP Configuring GVRP Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4 17-10 78-13315-02 .

the VMPS database downloads from the TFTP server automatically and VMPS is reenabled. page 18-xii Understanding How VMPS Works With VMPS. the switch assigns the new port to the proper VLAN for that host dynamically. When the VMPS server receives a valid request from a client. If you reset or power cycle the switch. When you move a host from a port on one switch in the network to a port on another switch in the network. page 18-ii Dynamic Port VLAN Membership and VMPS Configuration Guidelines. This chapter consists of these sections: • • • • • • • Understanding How VMPS Works. a MAC address-to-VLAN mapping database downloads from a Trivial File Transfer Protocol (TFTP) server and VMPS begins to accept client requests. page 18-iii Troubleshooting VMPS and Dynamic Port VLAN Membership. page 18-i Default VMPS and Dynamic Port Configuration. refer to the Catalyst 6000 Family Command Reference publication.3 and 6. Note For complete syntax and usage information for the commands used in this chapter. you can assign switch ports to VLANs dynamically.4 78-13315-02 18-1 .C H A P T E R 18 Configuring Dynamic Port VLAN Membership with VMPS This chapter describes how to configure dynamic port VLAN membership using the VLAN Management Policy Server (VMPS). it searches its database for a MAC address-to-VLAN mapping. page 18-ix Dynamic Port VLAN Membership with Auxiliary VLANs. page 18-iii Configuring VMPS and Dynamic Port VLAN Membership. Catalyst 6000 Family Software Configuration Guide—Releases 6. When you enable VMPS. page 18-viii Dynamic Port VLAN Membership with VMPS Configuration Examples. based on the source Media Access Control (MAC) address of the device connected to the port. VMPS opens a User Datagram Protocol (UDP) socket to communicate and listen to client requests.

2(1). VMPS sends the fallback VLAN name to the client. which attempts to match the MAC address to a VLAN in the VMPS database. Default VMPS and Dynamic Port Configuration Table 1 shows the default VMPS and dynamic port configuration. In this case. If there is a match.keyword for the VLAN name. If the VLAN is not allowed on the port and VMPS is not in secure mode. a dynamic port is isolated from its static VLAN. If a VLAN in the database does not match the current VLAN on the port and active hosts are on the port. When the link comes up.1 Null Open Allow VMPS enable state VMPS management domain VMPS TFTP server VMPS database configuration filename VMPS fallback VLAN VMPS secure mode VMPS no domain requests Catalyst 6000 Family Software Configuration Guide—Releases 6. If you connect a device with a MAC address that is not in the database.4 18-2 78-13315-02 .3 and 6. If the link goes down on a dynamic port. Table 18-1 Default VMPS and Dynamic Port Configuration Feature VMPS server Default Configuration Disabled Null None vmps-config-database. You can configure a fallback VLAN name. Any hosts that come online through the port are checked again with VMPS before the port is assigned to a VLAN. The source MAC address from the first packet of a new host on the dynamic port is sent to VMPS. If VMPS is in secure mode. it sends a port shutdown response. If the VLAN is allowed on the port.2(1)—with software release 6. VMPS verifies the requesting port against this group.Chapter 18 Default VMPS and Dynamic Port Configuration Configuring Dynamic Port VLAN Membership with VMPS If the assigned VLAN is restricted to a group of ports. VMPS provides the VLAN number to assign to the port. the host receives an “access denied” response. If there is no match. a port can belong to a native VLAN and an auxiliary VLAN. VMPS sends an access denied or a port shutdown response based on the VMPS secure mode. the port returns to an isolated state. VMPS sends an access denied response. If VMPS is in secure mode. VMPS either denies the request or shuts down the port (depending on the VMPS secure mode setting). the VLAN name is returned to the client. See the “Dynamic Port VLAN Membership with Auxiliary VLANs” section on page 18-xii for complete details. VMPS sends an access denied or port shutdown response. Multiple hosts (MAC addresses) can be active on a dynamic port if they are all in the same VLAN. You can also make an explicit entry in the configuration table to deny access to specific MAC addresses for security reasons by specifying a --NONE-. If you do not configure a fallback VLAN and the MAC address does not exist in the database. the port is shut down. A dynamic port can belong to only one native VLAN in software releases prior to release 6.

For more information. VMPS checks the legality of the specific host on the dynamic port after a certain period. If you reconfigure a port from a static port to a dynamic port on the same VLAN.” Configuring VMPS and Dynamic Port VLAN Membership These sections describe how to configure VMPS and define dynamic ports on clients: • • • • • Creating the VMPS Database. Static ports that are trunking cannot become dynamic ports. “Configuring VLANs.Chapter 18 Configuring Dynamic Port VLAN Membership with VMPS Dynamic Port VLAN Membership and VMPS Configuration Guidelines Table 18-1 Default VMPS and Dynamic Port Configuration (continued) Feature VMPS Client Default Configuration None 60 minutes 3 No dynamic ports configured VMPS domain server VMPS reconfirm interval VMPS server retry count Dynamic ports Dynamic Port VLAN Membership and VMPS Configuration Guidelines These guidelines and restrictions apply to dynamic port VLAN membership: • • You must configure VMPS before you configure ports as dynamic. You must turn off trunking on the trunk port before changing it from static to dynamic.3 and 6. However. You can disable spanning tree PortFast mode on a dynamic port. When you configure a port as dynamic. You must turn off security on the static secure port before it can become dynamic. spanning tree PortFast is enabled automatically for that port. the port connects immediately to that VLAN. “Configuring VTP. page 18-v Administering and Monitoring VMPS.” and Chapter 11. page 18-v Configuring Dynamic Ports on VMPS Clients. page 18-vi Configuring Static VLAN Port Membership. Automatic enabling of spanning tree PortFast prevents applications on the host from timing out and entering loops caused by incorrect configurations.4 78-13315-02 18-3 . see Chapter 10. page 18-vii Catalyst 6000 Family Software Configuration Guide—Releases 6. page 18-iv Configuring VMPS. Static secure ports cannot become dynamic ports. • • • Note The VTP management domain and the management VLAN of VMPS clients and the VMPS server must be the same.

Move the ASCII text file to a TFTP server so it can be downloaded to the switch. These logical groups define the VLAN port policies. Create an ASCII text file on your workstation or PC that contains the MAC address-to-VLAN mappings. perform this task: Task Step 1 Step 2 Command show cam — Determine the MAC addresses of the hosts you want to be assigned to VLANs dynamically. You can configure a restricted VLAN by defining the set of dynamic ports on which it can exist. Note For an example ASCII text VMPS database configuration file. Define VLAN groups—A VLAN group defines a logical group of VLANs. Define the MAC address-to-VLAN name mappings—Enter the MAC address of each host and the VLAN to which each should belong.3 and 6. Define VLAN port policies—VLAN port policies define the ports associated with a restricted VLAN. Ranges are not allowed for the port numbers. A port is identified by the IP address of the switch and the module/port number of the port in the form mod/port. Step 3 — Catalyst 6000 Family Software Configuration Guide—Releases 6. Define port groups—A port group is a logical group of ports. The VMPS parser is line based. The keyword all-ports specifies all the ports in the specified switch. Define the VMPS domain—The VMPS domain should correspond to the VTP domain name configured on the switch. Follow these guidelines for creating the VMPS database file: • • • • • Begin the configuration file with the word “VMPS.Chapter 18 Configuring VMPS and Dynamic Port VLAN Membership Configuring Dynamic Port VLAN Membership with VMPS Creating the VMPS Database To use VMPS. • • • To create a VMPS database. you first must create a VMPS database and store it on a TFTP server. You can apply VMPS policies to individual ports or to port groups.” to prevent other types of configuration files from incorrectly being read by the VMPS server.keyword as the VLAN name to deny the specified host network connectivity. see the “VMPS Database Configuration File Example” section on page 18-ix. Define the security mode—VMPS can operate in open or secure mode. Use the --NONE-. (Optional) Define a fallback VLAN—The fallback VLAN is assigned if the MAC addresses of the connected host is not defined in the database. Start each entry in the file on a new line.4 18-4 78-13315-02 .

Chapter 18 Configuring Dynamic Port VLAN Membership with VMPS Configuring VMPS and Dynamic Port VLAN Membership Configuring VMPS When you enable VMPS. Console> (enable) Configuring Dynamic Ports on VMPS Clients To configure dynamic ports on VMPS client switches. Console> (enable) To disable VMPS. Verify the VMPS server specification. Configure dynamic port VLAN membership assignment to a port. To configure VMPS. Verify the dynamic port assignments. perform this task in privileged mode: Task Step 1 Step 2 Command set vmps downloadmethod rcp | tftp [username] Specify the download method. This example shows how to disable VMPS on the switch: Console> (enable) set vmps state disable All the VMPS configuration information will be lost and the resources released on disable. Catalyst 6000 Family Software Configuration Guide—Releases 6. Verify the VMPS configuration. perform this task in privileged mode: Task Step 1 Step 2 Command set vmps state disable show vmps Disable VMPS. Verify that VMPS is disabled. perform this task in privileged mode: Task Step 1 Step 2 Step 3 Step 4 Command set vmps server ip_addr [primary] show vmps server set port membership mod/port dynamic show port [mod[/port]] Specify the IP address of the VMPS server (the switch with VMPS enabled). Configure the IP address of the TFTP or rcp server set vmps downloadserver ip_addr [filename] on which the ASCII text VMPS database configuration file resides. Enable VMPS. set vmps state enable show vmps Step 3 Step 4 This example shows how to enable VMPS on the switch: Console> (enable) set vmps state enable Vlan Membership Policy Server enable is in progress. the switch downloads the VMPS database from the TFTP or rcp server and begins accepting VMPS requests.3 and 6.4 78-13315-02 18-5 . Do you want to continue (y/n[n]): y Vlan Membership Policy Server disabled.

Chapter 18 Configuring VMPS and Dynamic Port VLAN Membership

Configuring Dynamic Port VLAN Membership with VMPS

This example shows how to specify the VMPS server, verify the VMPS server specification, assign dynamic ports, and verify the configuration:
Console> (enable) show vmps server VMPS domain server VMPS Status --------------------------------------192.0.0.6 192.0.0.1 primary 192.0.0.9 Console> (enable) set port membership 3/1-3 dynamic Ports 3/1-3 vlan assignment set to dynamic. Spantree port fast start option enabled for ports 3/1-3. Console> (enable) set port membership 1/2 dynamic Trunking port 1/2 vlan assignment cannot be set to dynamic. Console> (enable) set port membership 2/1 dynamic ATM LANE port 2/1 vlan assignment can not be set to dynamic. Console> show port Port Name Status Vlan Level Duplex Speed 1/1 connect dyn-3 normal full 100 1/2 connect trunk normal half 100 2/1 connect trunk normal full 155 3/1 connect dyn-5 normal half 10 3/2 connect dyn-5 normal half 10 3/3 connect dyn-5 normal half 10 Console> (enable)

Type 100 BASE-TX 100 BASE-TX OC3 MMF ATM 10 BASE-T 10 BASE-T 10 BASE-T

Note

The show port command displays dyn- under the Vlan column of the display when it has not yet been assigned a VLAN for a port.

Administering and Monitoring VMPS
To show information about MAC address-to-VLAN mappings, perform one of these tasks in privileged mode: Task Show the VLAN to which a MAC address is mapped in the database. Show the MAC addresses that are mapped to a VLAN in the database. Show ports belonging to a restricted VLAN. Command show vmps mac [mac_address] show vmps vlan [vlan_name] show vmps vlanports [vlan_name]

To show VMPS statistics, perform this task in privileged mode: Task Show VMPS statistics. Command show vmps statistics

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Configuring Dynamic Port VLAN Membership with VMPS Configuring VMPS and Dynamic Port VLAN Membership

To clear VMPS statistics, perform this task in privileged mode: Task Clear VMPS statistics. Command clear vmps statistics

To clear a VMPS server entry, perform this task in privileged mode: Task Clear a VMPS server entry. Command clear vmps server ip_addr

To reconfirm the dynamic port VLAN membership assignments, perform this task in privileged mode: Task
Step 1 Step 2

Command reconfirm vmps

Reconfirm dynamic port VLAN membership.

Verify the dynamic VLAN reconfirmation status. show dvlan statistics This example shows how to reconfirm dynamic port VLAN membership assignments:
Console> (enable) reconfirm vmps reconfirm process started Use 'show dvlan statistics' to see reconfirm status Console> (enable)

To download the VMPS database manually (to download a changed database configuration file or retry after a failed download attempt), perform this task in privileged mode: Task
Step 1

Command download vmps

Download the VMPS database from the TFTP server, or specify a different VMPS database configuration file. Verify the VMPS database configuration file.

Step 2

show vmps

Configuring Static VLAN Port Membership
To return a port to static VLAN port membership, perform this task in privileged mode: Task
Step 1 Step 2

Command set port membership mod/port static show port [mod[/port]]

Configure static port VLAN membership assignment to a port. Verify the static port assignments.

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Chapter 18 Troubleshooting VMPS and Dynamic Port VLAN Membership

Configuring Dynamic Port VLAN Membership with VMPS

This example shows how to return a port to static VLAN port membership:
Console> (enable) set port membership 3/1 static Port 3/1 vlan assignment set to static. Console> (enable)

Troubleshooting VMPS and Dynamic Port VLAN Membership
These sections describe how to troubleshoot VMPS and dynamic port VLAN membership:
• •

Troubleshooting VMPS, page 18-viii Troubleshooting Dynamic Port VLAN Membership, page 18-viii

Troubleshooting VMPS
Table 2 shows VMPS error messages you might see when you enter the set vmps state enable or the download vmps command.
Table 18-2 VMPS Error Messages

VMPS Error Message
TFTP server IP address is not configured. Unable to contact the TFTP server 172.16.254.222. File “vmps_configuration.db” not found on the TFTP server 172.16.254.222. Enable failed due to insufficient resources.

Recommended Action Specify the TFTP server address using the set vmps tftpserver ip_addr [filename] command. Enter a static route (using the set ip route command) to the TFTP server. Check the filename of the VMPS database configuration file on the TFTP server. Make sure the permissions are set correctly. The switch does not have sufficient resources to run the database. You can fix this problem by increasing the dynamic random-access memory (DRAM).

After VMPS successfully downloads the VMPS database configuration file, it parses the file and builds a database. When the parsing is complete, VMPS outputs statistics about the total number of lines parsed and the number of parsing errors. To obtain more information on VMPS parsing errors, set the syslog level for VMPS to 3 using the set logging level vmps 3 command.

Troubleshooting Dynamic Port VLAN Membership
A dynamic port might shut down under these circumstances:
• •

VMPS is in secure mode and it is illegal for the host to connect to the port. The port shuts down to prevent the host from connecting to the network. More than 50 active hosts reside on a dynamic port.

To reenable a shut-down dynamic port, enter the set port enable mod/port command.

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Configuring Dynamic Port VLAN Membership with VMPS Dynamic Port VLAN Membership with VMPS Configuration Examples

Dynamic Port VLAN Membership with VMPS Configuration Examples
These sections show examples of how to configure VMPS and dynamic ports:
• •

VMPS Database Configuration File Example, page 18-ix Dynamic Port VLAN Membership Configuration Example, page 18-x

VMPS Database Configuration File Example
This example shows a sample VMPS database configuration file. A VMPS database configuration file is an ASCII text file that is stored on a TFTP server accessible to the switch configured as the VMPS server. A summary of the configuration example follows:
• • • • • •

The security mode is open. The default is used for the fallback VLAN. MAC address-to-VLAN name mappings—The MAC address of each host and the VLAN to which each host belongs is defined. Port groups are defined. VLAN groups are defined. VLAN port policies are defined for the ports associated with restricted VLANs.

!VMPS File Format, version 1.1 ! Always begin the configuration file with ! the word “VMPS” ! !vmps domain <domain-name> ! The VMPS domain must be defined. !vmps mode {open | secure} ! The default mode is open. !vmps fallback <vlan-name> !vmps no-domain-req { allow | deny } ! ! The default value is allow. vmps domain WBU vmps mode open vmps fallback default vmps no-domain-req deny ! ! !MAC Addresses ! vmps-mac-addrs ! ! address <addr> vlan-name <vlan_name> ! address 0012.2233.4455 vlan-name hardware address 0000.6509.a080 vlan-name hardware address aabb.ccdd.eeff vlan-name Green address 1223.5678.9abc vlan-name ExecStaff address fedc.ba98.7654 vlan-name --NONE-address fedc.ba23.1245 vlan-name Purple !

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Configuring Dynamic Port VLAN Membership with VMPS

!Port Groups ! !vmps-port-group <group-name> ! device <device-id> { port <port-name> | all-ports } ! vmps-port-group WiringCloset1 device 198.92.30.32 port 3/2 device 172.20.26.141 port 2/8 vmps-port-group “Executive Row” device 198.4.254.222 port 1/2 device 198.4.254.222 port 1/3 device 198.4.254.223 all-ports ! ! !VLAN groups ! !vmps-vlan-group <group-name> ! vlan-name <vlan-name> ! vmps-vlan-group Engineering vlan-name hardware vlan-name software ! ! !VLAN port Policies ! !vmps-port-policies {vlan-name <vlan_name> | vlan-group <group-name> } ! { port-group <group-name> | device <device-id> port <port-name> } ! vmps-port-policies vlan-group Engineering port-group WiringCloset1 vmps-port-policies vlan-name Green device 198.92.30.32 port 4/8 vmps-port-policies vlan-name Purple device 198.4.254.22 port 1/2 port-group “Executive Row”

Dynamic Port VLAN Membership Configuration Example
Figure 1 shows a network with a VMPS server switch and VMPS client switches with dynamic ports. In this example, these assumptions apply:
• • • •

The VMPS server and the VMPS client are separate switches. Switch 1 is the primary VMPS server. Switch 3 and Switch 10 are secondary VMPS servers. End stations are connected to these clients:
– Switch 2 – Switch 9

The database configuration file is called Bldg-G.db and is stored on a TFTP server with IP address 172.20.22.7.

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Configuring Dynamic Port VLAN Membership with VMPS Dynamic Port VLAN Membership with VMPS Configuration Examples

Figure 18-1 Dynamic Port VLAN Membership Configuration

Catalyst 6500 series switches Primary VMPS Server 1 Switch 1 172.20.26.150 3/1
Switch 2

TFTP server

172.20.22.7 Client

End station 1

172.20.26.151

Catalyst 6000

Secondary VMPS Server 2 Switch 3 172.20.26.152

Switch 4

Ethernet segment

172.20.26.153
Switch 5

172.20.26.154
Switch 6

172.20.26.155

Switch 7

172.20.26.156

Switch 8

172.20.26.157 Client
Switch 9

End station 2 172.20.26.158 Catalyst 6500 series switches Secondary VMPS Server 3 Switch 10 172.20.26.159
55908

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Configuring Dynamic Port VLAN Membership with VMPS

Use this procedure to configure VMPS and dynamic ports:
Step 1

Configure Switch 1 as the primary VMPS server.
a.

Configure the IP address of the TFTP server on which the ASCII file resides:
Console> (enable) set vmps tftpserver 172.20.22.7 Bldg-G.db

b.

Enable VMPS:
Console> (enable) set vmps state enable

After entering these commands, the file Bldg-G.db is downloaded to Switch 1. Switch 1 becomes the VMPS server.
Step 2

Configure the VMPS server addresses on each VMPS client.
a.

Configure the primary VMPS server IP address:
Console> (enable) set vmps server 172.20.26.150 primary

b.

Configure the secondary VMPS server IP addresses:
Console> (enable) set vmps server 172.20.26.152 Console> (enable) set vmps server 172.20.26.159

c.

Verify the VMPS server addresses:
Console> (enable) show vmps server

Step 3

Configure port 3/1 on Switch 2 as dynamic.
Console> (enable) set port membership 3/1 dynamic

Step 4

Connect End Station 2 on port 3/1. When End Station 2 sends a packet, Switch 2 sends a query to the primary VMPS server, Switch 1. Switch 1 responds with the VLAN to assign to port 3/1. Because spanning tree PortFast mode is enabled by default on dynamic ports, port 3/1 connects immediately and enters forwarding mode. Repeat Steps 2 and 3 to configure the VMPS server addresses and assign dynamic ports on each VMPS client switch.

Step 5

Dynamic Port VLAN Membership with Auxiliary VLANs
Note

This feature requires software release 6.2(1) or later releases. This section describes how to configure a dynamic port to belong to two VLANs—a native VLAN and an auxiliary VLAN. This section uses the following terminology:
• • • •

Auxiliary VLAN—Separate VLAN for IP phones Native VLAN—Traditional VLAN for data Auxiliary VLAN ID—VLAN ID of an auxiliary VLAN Native VLAN ID—VLAN ID of a native VLAN

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Configuring Dynamic Port VLAN Membership with VMPS Dynamic Port VLAN Membership with Auxiliary VLANs

Prior to software release 6.2(1), dynamic ports could only belong to one VLAN. You could not enable the dynamic port VLAN feature on ports that carried a native VLAN and an auxiliary VLAN. With software release 6.2(1) and later releases, the dynamic ports can belong to two VLANs. The switch port configured for connecting an IP phone can have separate VLANs configured for carrying:
• •

Voice traffic to and from the IP phone (auxiliary VLAN) Data traffic to and from the PC connected to the switch through the access port of the IP phone (native VLAN)

These sections include configuration guidelines and examples:
• •

Configuration Guidelines, page 18-xiii Configuring Dynamic Port VLAN Membership with Auxiliary VLANs, page 18-xiii

Note

For detailed information on auxiliary VLANs and Cisco voice-over-IP networks, see Chapter 44, “Configuring a VoIP Network.”

Configuration Guidelines
These guidelines and restrictions apply to configuring dynamic port VLAN membership for auxiliary VLANs:

Configuration of the native VLAN ID is dynamic for the PC connected to the access port of the IP phone. Configuration of the auxiliary VLAN ID is not dynamic; you need to configure it manually. As the auxiliary VLAN ID is manually configured, the VMPS server is queried for packets coming from the PC, not for packets coming from the IP phone. All packets except Cisco Discovery Protocol (CDP) packets from the IP phone are tagged with the auxiliary VLAN ID. All packets tagged with the auxiliary VLAN ID are considered to be packets from the phone and all other packets are considered to be packets from the PC. When configuring the auxiliary VLAN ID with 802.1p or untagged frames, you need to configure the VMPS server with the IP phone’s MAC address (see the “Dynamic Port VLAN Membership with VMPS Configuration Examples” section on page 18-ix for information on configuring VMPS). For dynamic ports, the auxiliary VLAN ID cannot be the same as the native VLAN ID assigned by VMPS for the dynamic port. See the “Dynamic Port VLAN Membership and VMPS Configuration Guidelines” section on page 18-iii prior to configuring any port.

• •

Configuring Dynamic Port VLAN Membership with Auxiliary VLANs
This example shows how to add voice ports to auxiliary VLANs and specify an encapsulation type:
Console> (enable) set port auxiliaryvlan 5/9 222 Auxiliaryvlan 222 configuration successful. AuxiliaryVlan AuxVlanStatus Mod/Ports ------------- ------------- ------------------------222 active 5/9 Console> (enable)

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Configuring Dynamic Port VLAN Membership with VMPS

Console> (enable) set port auxiliaryvlan 5/9 dot1p Port 5/9 allows the connected device send and receive packets with 802.1p priority. Console> (enable)

This example shows how to specify port 5/9 as a dynamic port:
Console> Warning: phones. Port 5/9 Spantree Console> (enable) set port membership 5/9 dynamic Auxiliary Vlan set to dot1p|untagged on dynamic port. VMPS will be queried for IP vlan assignment set to dynamic. port fast start option enabled for ports 5/9. (enable)

This example shows that the auxiliary VLAN ID specified cannot be the same as the native VLAN ID:
Console> (enable) set port auxiliaryvlan 5/10 223 Auxiliary vlan cannot be set to 223 as PVID=223. Console> (enable)

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C H A P T E R

19

Checking Port Status and Connectivity
This chapter describes how to check switch port status and connectivity on the Catalyst 6000 family switches.

Note

For complete syntax and usage information for the commands used in this chapter, refer to the Catalyst 6000 Family Command Reference publication. This chapter consists of these sections:
• • • • • • • • •

Checking Module Status, page 19-i Checking Port Status, page 19-ii Checking Port Capabilities, page 19-iv Using Telnet, page 19-iv Using Secure Shell Encryption for Telnet Sessions, page 19-v Monitoring User Sessions, page 19-vi Using Ping, page 19-vii Using Layer 2 Traceroute, page 19-ix Using IP Traceroute, page 19-x

Checking Module Status
Catalyst 6000 family switches are multimodule systems. You can see what modules are installed, as well as the MAC address ranges and version numbers for each module, using the show module [mod] command. Specify a particular module number to see detailed information on that module. This example shows how to check module status. The output shows that there is one supervisor engine and four additional modules installed in the chassis.

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Console> Mod Slot --- ---1 1 2 2 3 3 4 4 5 5

(enable) show module Ports Module-Type ----- ------------------------2 1000BaseX Supervisor 24 100BaseFX MM Ethernet 8 1000BaseX Ethernet 48 10/100BaseTX (Telco) 48 10/100BaseTX (RJ-45) Serial-Num ----------SAD03040546 SAD03110020 SAD03070194 SAD03140787 SAD03181291

Model ------------------WS-X6K-SUP1-2GE WS-X6224-100FX-MT WS-X6408-GBIC WS-X6248-TEL WS-X6248-RJ-45

Status -------ok ok ok ok ok

Mod Module-Name --- ------------------1 2 3 4 5

Mod MAC-Address(es) --- -------------------------------------1 00-50-f0-a8-26-b2 to 00-50-f0-a8-26-b3 00-50-f0-a8-26-b0 to 00-50-f0-a8-26-b1 00-50-3e-8d-64-00 to 00-50-3e-8d-67-ff 2 00-50-54-6c-e9-a8 to 00-50-54-6c-e9-bf 3 00-50-54-6c-93-6c to 00-50-54-6c-93-73 4 00-50-54-bf-59-64 to 00-50-54-bf-59-93 5 00-50-f0-ac-30-54 to 00-50-f0-ac-30-83

Hw Fw Sw ------ ---------- ----------------1.4 5.1(1) 5.2(1)CSX

1.3 1.4 0.103 1.0

4.2(0.24)V 4.2(0.24)V 4.2(0.24)V 4.2(0.24)V

5.2(1)CSX 5.2(1)CSX 5.2(1)CSX 5.2(1)CSX

Mod Sub-Type Sub-Model Sub-Serial Sub-Hw --- ----------------------- ------------------- ----------- -----1 L2 Switching Engine I WS-F6020 SAD03040312 1.0 Console> (enable)

This example shows how to check module status on a specific module:
Console> Mod Slot --- ---4 4 (enable) show module 4 Ports Module-Type Model Status ----- ------------------------- ------------------- -------48 10/100BaseTX (Telco) WS-X6248-TEL ok

Mod Module-Name Serial-Num --- ------------------- ----------4 SAD03140787 Mod MAC-Address(es) Hw Fw Sw --- -------------------------------------- ------ ---------- ----------------4 00-50-54-bf-59-64 to 00-50-54-bf-59-93 0.103 4.2(0.24)V 5.2(1)CSX Console> (enable)

Checking Port Status
You can see summary or detailed information on the switch ports using the show port [mod[/port]] command. To see summary information on all of the ports on the switch, enter the show port command with no arguments. Specify a particular module number to see information on the ports on that module only. Enter both the module number and the port number to see detailed information about the specified port. To apply configuration commands to a particular port, you must specify the appropriate logical module. For more information, see the “Checking Module Status” section on page 19-i.

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Checking Port Status and Connectivity Checking Port Status

This example shows how to see information on the ports on a specific module only:
Console> (enable) show port 1 Port Name Status ----- ------------------ ---------1/1 connected 1/2 notconnect Port ----1/1 1/2 Vlan Duplex Speed Type ---------- ------ ----- -----------1 full 1000 1000BaseSX 1 full 1000 1000BaseSX Shutdown -------No No Trap -------disabled disabled IfIndex ------3 4

Security Secure-Src-Addr Last-Src-Addr -------- ----------------- ----------------disabled disabled

Port Broadcast-Limit Broadcast-Drop -------- --------------- -------------------1/1 0 1/2 0 Port ----1/1 1/2 Port Send FlowControl admin oper -------- -------desired off desired off Status Receive FlowControl admin oper -------- -------off off off off Admin Group ----65 65 RxPause TxPause

---------- ---------0 0 0 0

Channel Mode ----- ---------- --------1/1 connected auto 1/2 notconnect auto

Ch Neighbor Neighbor Id Device Port ----- ----------------------------------- ----0 0

Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize ----- ---------- ---------- ---------- ---------- --------1/1 0 0 0 0 0 1/2 0 0 0 0 0 Port Single-Col Multi-Coll Late-Coll Excess-Col Carri-Sen Runts Giants ----- ---------- ---------- ---------- ---------- --------- --------- --------1/1 0 0 0 0 0 0 0 1/2 0 0 0 0 0 0 0 Last-Time-Cleared -------------------------Tue Jun 8 1999, 10:01:35 Console> (enable)

This example shows how to see information on an individual port:
Console> (enable) show port 1/1 Port Name Status Vlan Duplex Speed Type ----- ------------------ ---------- ---------- ------ ----- -----------1/1 connected 1 full 1000 1000BaseSX Port Security Secure-Src-Addr Last-Src-Addr Shutdown Trap IfIndex ----- -------- ----------------- ----------------- -------- -------- ------1/1 disabled No disabled 3 Port Broadcast-Limit Broadcast-Drop -------- --------------- -------------------1/1 0 Port Send FlowControl Receive FlowControl admin oper admin oper ----- -------- --------------- -------1/1 desired off off off

RxPause

TxPause

---------- ---------0 0

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Port

Channel Mode ----- ---------- --------1/1 connected auto

Status

Admin Group ----65

Ch Neighbor Neighbor Id Device Port ----- ----------------------------------- ----0

Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize ----- ---------- ---------- ---------- ---------- --------1/1 0 0 0 0 0 Port Single-Col Multi-Coll Late-Coll Excess-Col Carri-Sen Runts Giants ----- ---------- ---------- ---------- ---------- --------- --------- --------1/1 0 0 0 0 0 0 0 Last-Time-Cleared -------------------------Tue Jun 8 1999, 10:01:35 Console> (enable)

Checking Port Capabilities
You can display the capabilities of any port in a switch using the show port capabilities [[mod][/port]] command. This example shows you how to display the port capabilities for switch ports:
Console> (enable) show port capabilities 1/1 Model WS-X6K-SUP1A-2GE Port 1/1 Type No Connector Speed 1000 Duplex full Trunk encap type 802.1Q,ISL Trunk mode on,off,desirable,auto,nonegotiate Channel yes Broadcast suppression percentage(0-100) Flow control receive-(off,on,desired),send-(off,on,desired) Security yes Membership static,dynamic Fast start yes QOS scheduling rx-(1p1q4t),tx-(1p2q2t) CoS rewrite yes ToS rewrite DSCP UDLD yes Inline power no AuxiliaryVlan no SPAN source,destination COPS port group 1/1-2 Console> (enable)

Using Telnet
You can access the switch command-line interface (CLI) using Telnet. In addition, you can use Telnet from the switch to access other devices in the network. Up to eight simultaneous Telnet sessions are possible.

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Checking Port Status and Connectivity Using Secure Shell Encryption for Telnet Sessions

To Telnet to another device on the network from the switch, perform this task in privileged mode: Task Open a Telnet session with a remote host. Command telnet host [port]

This example shows how to Telnet from the switch to a remote host:
Console> (enable) telnet labsparc Trying 172.16.10.3... Connected to labsparc. Escape character is '^]'. UNIX(r) System V Release 4.0 (labsparc) login:

Using Secure Shell Encryption for Telnet Sessions
Note

To use the Secure Shell encryption feature commands, you must be running an encryption image. The set crypto key rsa, clear crypto key rsa, and show crypto key commands are used for encryption. See Chapter 25, “Working with System Software Images” for the software image naming conventions used for the encryption images. The Secure Shell encryption feature provides security for Telnet sessions to the switch. Secure Shell encryption is supported for remote logins to the switch only. Telnet sessions initiated from the switch cannot be encrypted. To use this feature, you must install the application on the client accessing the switch, and you must configure Secure Shell encryption on the switch. The current implementation of Secure Shell encryption supports SSH version 1, the DES and 3DES encryption methods, and can be used with RADIUS and TACACS+ authentication. To configure authentication with Secure Shell encryption, use the telnet keyword in the set authentication commands.

Note

If you are using Kerberos to authenticate to the switch, you will not be able to use the Secure Shell encryption feature. To enable Secure Shell encryption on the switch, perform this task in privileged mode: Task Create the RSA host key. Command set crypto key rsa nbits [force]

This example shows how to create the RSA host key:
Console> (enable) set crypto key rsa 1024 Generating RSA keys.... [OK] Console> (enable)

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The nbits value specifies the RSA key size. The valid key size range is 512 to 2048 bits. A key size with a larger number provides higher security but takes longer to generate. You can enter the optional force keyword to regenerate the keys and suppress the warning prompt of overwriting existing keys.

Monitoring User Sessions
You can display the currently active user sessions on the switch using the show users command. The command output displays all active console port and Telnet sessions on the switch. To display the active user sessions on the switch, perform this task in privileged mode: Task Display the currently active user sessions on the switch. Command show users [noalias]

This example shows the output of the show users command when local authentication is enabled for console and Telnet sessions (the asterisk [*] indicates the current session):
Console> (enable) show users Session User Location -------- ---------------- ------------------------console telnet sam-pc.bigcorp.com * telnet jake-mac.bigcorp.com Console> (enable)

This example shows the output of the show users command when TACACS+ authentication is enabled for console and Telnet sessions:
Console> (enable) show users Session User Location -------- ---------------- ------------------------console sam telnet jake jake-mac.bigcorp.com telnet tim tim-nt.bigcorp.com * telnet suzy suzy-pc.bigcorp.com Console> (enable)

This example shows how to display information about user sessions using the noalias keyword to display the IP addresses of connected hosts:
Console> (enable) show users noalias Session User Location -------- ---------------- ------------------------console telnet 10.10.10.12 * telnet 10.10.20.46 Console> (enable)

To disconnect an active user session, perform this task in privileged mode: Task Disconnect an active user session on the switch. Command disconnect {console | ip_addr}

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Checking Port Status and Connectivity Using Ping

This example shows how to disconnect an active console port session and an active Telnet session:
Console> (enable) show users Session User Location -------- ---------------- ------------------------console sam telnet jake jake-mac.bigcorp.com telnet tim tim-nt.bigcorp.com * telnet suzy suzy-pc.bigcorp.com Console> (enable) disconnect console Console session disconnected. Console> (enable) disconnect tim-nt.bigcorp.com Telnet session from tim-nt.bigcorp.com disconnected. (1) Console> (enable) show users Session User Location -------- ---------------- ------------------------telnet jake jake-mac.bigcorp.com * telnet suzy suzy-pc.bigcorp.com Console> (enable)

Using Ping
These sections describe how to use IP ping:
• •

Understanding How Ping Works, page 19-vii Executing Ping, page 19-viii

Understanding How Ping Works
You can use IP ping to test connectivity to remote hosts. If you attempt to ping a host in a different IP subnetwork, you must define a static route to the network or configure a router to route between those subnets. The ping command is configurable from normal executive and privileged executive mode. In normal executive mode, the ping command supports the -s parameter, which allows you to specify the packet size and packet count. In privileged executive mode, the ping command lets you specify the packet size, packet count, and the wait time. Table 19-1 shows the default values that apply to the ping-s command.
Table 19-1 Ping Default Values

Description Number of Packets Packet Size Wait Time Source Address

Ping 5 56 2 Host IP Address

Ping-s 0=continuous ping 56 2 N/A

To stop a ping in progress, press Ctrl-C.

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Ping returns one of the following responses:
• • • • •

Normal response—The normal response (hostname is alive) occurs in 1 to 10 seconds, depending on network traffic. Destination does not respond—If the host does not respond, a no answer message is returned. Unknown host—If the host does not exist, an unknown host message is returned. Destination unreachable—If the default gateway cannot reach the specified network, a destination unreachable message is returned. Network or host unreachable—If there is no entry in the route table for the host or network, a network or host unreachable message is returned.

Executing Ping
To ping another device on the network from the switch, perform one of these tasks in normal or privileged mode: Task Ping a remote host. Ping a remote host using ping options. Command ping host ping -s host [packet_size] [packet_count]

This example shows how to ping a remote host from normal executive mode:
Console> ping labsparc labsparc is alive Console> ping 72.16.10.3 12.16.10.3 is alive Console>

This example shows how to ping a remote host using the ping -s option:
Console> ping -s 12.20.5.3 800 10 PING 12.20.2.3: 800 data bytes 808 bytes from 12.20.2.3: icmp_seq=0. 808 bytes from 12.20.2.3: icmp_seq=1. 808 bytes from 12.20.2.3: icmp_seq=2. 808 bytes from 12.20.2.3: icmp_seq=3. 808 bytes from 12.20.2.3: icmp_seq=4. 808 bytes from 12.20.2.3: icmp_seq=5. 808 bytes from 12.20.2.3: icmp_seq=6. 808 bytes from 12.20.2.3: icmp_seq=7. 808 bytes from 12.20.2.3: icmp_seq=8. 808 bytes from 12.20.2.3: icmp_seq=9.

time=2 time=3 time=2 time=2 time=2 time=2 time=2 time=2 time=2 time=3

ms ms ms ms ms ms ms ms ms ms

----17.20.2.3 PING Statistics---10 packets transmitted, 10 packets received, 0% packet loss round-trip (ms) min/avg/max = 2/2/3 Console>

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) If any devices in the path are transparent to CDP. Information is displayed about all Catalyst 6000 family switches that are in the path from the source to the destination.20.20.Chapter 19 Checking Port Status and Connectivity Using Layer 2 Traceroute This example shows how to enter a ping command in privileged mode specifying the number of packets. (See Chapter 29. The Layer 2 Traceroute utility does not work with Token Ring VLANs. The maximum number of hops an l2trace query will try is 10.18]: 12. These sections describe how to use Layer 2 Traceroute: • • Layer 2 Traceroute Usage Guidelines. If the source and destination belong to multiple VLANs and you specify MAC addresses. 10 packets received.2. page 19-x Layer 2 Traceroute Usage Guidelines Follow these guidelines for using the Layer 2 Traceroute utility: • • The Layer 2 Traceroute utility works for unicast traffic only. You can use this utility from a switch that is not in the Layer 2 path between the source and the destination. l2trace will not be able to trace the Layer 2 path through those devices. this includes hops involved in source tracing. The source and destination switches must belong in the same VLAN.5. including the source and destination. you can also specify a VLAN.4 78-13315-02 19-9 .18 !!!!!!!!!! ----12. the packet size. or when multiple neighbors are on a port. however. The Layer 2 Traceroute utility determines the path by looking at the forwarding engine tables of the switches in the path.19 PING Statistics---10 packets transmitted.20. all of the switches in the path.2. You can trace a Layer 2 path by specifying the source and destination IP addresses (or IP aliases) or the MAC addresses.20. must be reachable from the switch. • • • • • • Catalyst 6000 Family Software Configuration Guide—Releases 6. or when multiple devices are attached to one port through hubs. “Configuring CDP” for information about enabling CDP.2. All switches in the path must be reachable from each other.19 Number of Packets [5]: 10 Datagram Size [56]: 100 Timeout in seconds [2]: 10 Source IP Address [12. page 19-ix Identifying a Layer 2 Path. 0% packet loss round-trip (ms) min/avg/max = 1/1/1 Console> (enable) Using Layer 2 Traceroute The Layer 2 Traceroute utility allows you to identify the physical path that a packet will take when going from a source to a destination. You must enable CDP on all of the Catalyst 5000 and 6000 family switches in the network. and the timeout period: Console> (enable) ping Target IP Address []: 12.3 and 6.

To identify the next hop. Catalyst 6000 Family Software Configuration Guide—Releases 6. it drops the datagram and sends back an Internet Control Message Protocol (ICMP) time-exceeded message to the sender.242. The second router sees a TTL value of 1. device name.3 and 6.Chapter 19 Using IP Traceroute Checking Port Status and Connectivity Identifying a Layer 2 Path To identify a Layer 2 path.168. page 19-xi Understanding How IP Traceroute Works The traceroute command uses the Time To Live (TTL) field in the IP header to cause routers and servers to generate specific return messages. in port name. such as routers. and returns the time-exceeded message to the source. The command output displays all network layer (Layer 3) devices.242. If a router finds a TTL value of 1 or 0. Console> (enable) l2trace 00-01-22-33-44-55 10-22-33-44-55-66 detail l2trace vlan number is 10. The traceroute facility determines the address of the first hop by examining the source address field of the ICMP time-exceeded message. 00-01-22-33-44-55 found in C5500 named wiring-1 on port 4/1 10Mb half duplex C5500:wiring-1:192. that the traffic passes through on the way to the destination. perform one of these tasks in privileged mode: Task Command (Optional) Trace a Layer 2 path using MAC l2trace {src-mac-addr} {dest-mac-addr} [vlan] [detail] addresses.10:4/1 10Mb half duplex -> 5/2 100MB full duplex C5000:backup-wiring-1:192.168.20:1/1 100Mb full duplex -> 3/1 100MB full duplex C5000:backup-core-1:192.30:4/1 100 MB full duplex -> 1/1 100MB full duplex C6000:core-1:192. and out port duplex mode. in port speed. with no VLAN specified. discards the datagram. Traceroute starts by sending a User Datagram Protocol (UDP) datagram to the destination host with the TTL field set to 1. 10-22-33-44-55-66 found in C6000 named core-1 on port 2/1 10MB half duplex. l2trace {src-ip-addr} {dest-ip-addr} [detail] This example shows the source and destination MAC addresses specified. page 19-x Executing IP Traceroute.168.168. device IP address. The first router decrements the TTL field by 1 and sends the datagram to the next router. Using IP Traceroute The IP Traceroute utility allows you to identify the path that packets take through the network at Layer 3 on a hop-by-hop basis. out port speed. out port name. (Optional) Trace a Layer 2 path using IP addresses or IP aliases.242. traceroute sends a UDP packet with a TTL value of 2. and the detail option specified. in port duplex mode. the output shows the device type. These sections describe how to use IP Traceroute: • • Understanding How IP Traceroute Works.4 19-10 78-13315-02 . This process continues until the TTL is incremented to a value large enough for the datagram to reach the destination host (or until the maximum TTL is reached). For each Catalyst 5000 and 6000 family switch found in the path.40:1/1 100MB full duplex -> 2/1 10MB half duplex.242.

1. This message indicates to the traceroute facility that it has reached the destination.1.3 and 6.1. traceroute sets the UDP destination port in the datagram to a very large value which the destination host is unlikely to be using.Chapter 19 Checking Port Status and Connectivity Using IP Traceroute To determine when a datagram reaches its destination. Switches can participate as the source or destination of the traceroute command but will not appear as a hop in the traceroute command output. 1440 byte packets 1 10.1.1.1) 1 ms 2 ms 1 ms 2 10.100) 2 ms 4 ms 3 ms 3 ms 3 ms 3 ms Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.100).1. 30 hops max.1.1) 2 ms 2 ms 2 ms 1 ms 2 ms 2 ms 2 10.1.100 (10.1. 40 byte packets 1 10.1.1. Executing IP Traceroute To trace the path that packets take through the network. Command traceroute [-n] [-w wait_time] [-i initial_ttl] [-m max_ttl] [-p dest_port] [-q nqueries] [-t tos] host [data_size] This example shows how to use the traceroute command: Console> (enable) traceroute 10.1.1. When a host receives a datagram with an unrecognized port number.1.1.100 (10.1.1. it sends an ICMP port unreachable error to the source. 30 hops max.1.100 (10.100 1400 traceroute to 10.100).1.100 (10.1.1.1.1.1.1. perform this task in privileged mode: Task Execute IP traceroute to trace the Layer 3 path that packets take through the network.1.4 78-13315-02 19-11 .1.100 traceroute to 10.1 (10.100) 2 ms 2 ms 2 ms Console> (enable) This example shows how to perform a traceroute with six queries to each hop with packets of 1400 bytes each: Console> (enable) traceroute -q 6 10.1.1 (10.

4 19-12 78-13315-02 .Chapter 19 Using IP Traceroute Checking Port Status and Connectivity Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.

refer to the Catalyst 6000 Family Command Reference publication. the system name is obtained through the Domain Name System (DNS) if you configure the switch as follows: • • • Assign the sc0 interface an IP address that is mapped to the switch name on the DNS server Enable DNS on the switch Specify at least one valid DNS server on the switch Catalyst 6000 Family Software Configuration Guide—Releases 6. This chapter consists of these sections: • • • • • • • • • • • • Setting the System Name and System Prompt. page 20-xvii Setting the System Name and System Prompt The system name on the switch is a user-configurable string used to identify the device. page 20-iv Creating a Login Banner.3 and 6. If you do not manually configure a system name.4 78-13315-02 20-1 . Note For complete syntax and usage information for the commands used in this chapter. The default configuration has no system name configured. page 20-i Setting the System Contact and Location. page 20-xi Environmental Monitoring. page 20-xvi Displaying System Status Information for Technical Support. page 20-iv Defining Command Aliases. page 20-iii Setting the System Clock. page 20-ix Power Management.C H A P T E R 20 Administering the Switch This chapter describes how to perform various administrative tasks on the Catalyst 6000 family switches. page 20-vii Configuring Permanent and Static ARP Entries. page 20-v Defining IP Aliases. page 20-vi Configuring Static Routes. page 20-viii Scheduling a System Reset.

Setting the Static System Name and Prompt These sections describe how to set the static system name and prompt: • • • Setting the Static System Name. The switch performs a DNS lookup for the system name whenever one of the following occurs: • • • • • The switch is initialized (power on or reset) You configure the IP address on the sc0 interface using the command-line interface (CLI) or Simple Network Management Protocol (SNMP) You configure a route using the set ip route command You clear the system name using the set system name command You enable DNS or specify DNS servers If the system name is user configured.3 and 6. no DNS lookup is performed. page 20-ii Setting the Static System Prompt. page 20-iii Clearing the System Name. Command set system name name_string Note When you set the system name. If you have not configured a system prompt. unless you manually configure the prompt using the set prompt command. Catalyst 6000> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. perform this task in privileged mode: Task Set the static system name. The prompt is updated whenever the system name changes. the first 20 characters of the system name are used as the system prompt (a greater-than symbol [>] is appended). the DNS host name of the switch is configured as the system name of the switch and is saved in NVRAM (the domain name is removed). page 20-iii Setting the Static System Name To set a static system name. This example shows how to configure the system name on the switch: Console> (enable) set system name Catalyst 6000 System name set. You can override the prompt string with the set prompt command. the system name is used as the system prompt.4 20-2 78-13315-02 .Chapter 20 Setting the System Name and System Prompt Administering the Switch If the DNS lookup is successful.

---------.04:04:07 20 min Catalyst 6000 Family Software Configuration Guide—Releases 6. perform this task in privileged mode: Task Set the static system prompt.---------. Console> (enable) Command set system name Setting the System Contact and Location You can set the system contact and location to help you with resource management tasks. Catalyst 6000> (enable) set system location Sunnyvale CA System location set.3 and 6. perform this task in privileged mode: Task Step 1 Step 2 Step 3 Command set system contact [contact_string] set system location [location_string] show system Set the system contact. Catalyst 6000> (enable) show system PS1-Status PS2-Status Fan-Status Temp-Alarm Sys-Status Uptime d.h:m:s Logout ---------.com System contact set. This example shows how to set the system contact and location and verify the configuration: Catalyst 6000> (enable) set system contact sysadmin@corp.---------.-------------. Set the system location.---------.--------ok none ok off ok 0.Chapter 20 Administering the Switch Setting the System Contact and Location Setting the Static System Prompt To set the static system prompt. To set the system contact and location. perform this task in privileged mode: Task Clear the system name. Verify the global system information.4 78-13315-02 20-3 . Command set prompt prompt_string This example shows how to set the static system prompt on the switch: Console> (enable) set prompt Catalyst6509> Catalyst6509> (enable) Clearing the System Name To clear the system name. This example shows how to clear the system name: Console> (enable) set system name System name cleared.

------------------------other none disable 9600 0% 0% Tue Jun 23 1998.---------. “Configuring NTP. Characters following the ending delimiter are discarded. see Chapter 31.----. 16:51:36 System Name System Location System Contact -----------------------.---.” To set the system clock.------.Chapter 20 Setting the System Clock Administering the Switch PS1-Type PS2-Type Modem Baud Traffic Peak Peak-Time ---------.com Catalyst 6000> (enable) Setting the System Clock Note You can configure the switch to obtain the time and date using the Network Time Protocol (NTP).-----------------------Catalyst 6000 Sunnyvale CA sysadmin@corp. page 20-v Catalyst 6000 Family Software Configuration Guide—Releases 6. The first character following the motd keyword is used to delimit the beginning and end of the banner text. perform this task in privileged mode: Task Command set time [day_of_week] [mm/dd/yy] [hh:mm:ss] show time Step 1 Step 2 Set the system clock. page 20-v Clearing the Login Banner. These sections describe how to configure and clear a login banner: • • Configuring a Login Banner.-----------------------. After entering the ending delimiter. For information on configuring NTP.------.3 and 6. press Return. 12:30:00 Console> (enable) show time Mon Jun 15 1998. 12:30:02 Console> (enable) Creating a Login Banner You can create a single or multiline message banner that appears on the screen when someone logs in to the switch. The banner must be fewer than 3070 characters. Display the current date and time. This example shows how to set the system clock and display the current date and time: Console> (enable) set time Mon 06/15/98 12:30:00 Mon Jun 15 1998.4 20-4 78-13315-02 .

perform this task in privileged mode: Task Clear the message of the day. Contact sysadmin@corp. The command and parameter arguments define the command to enter when the command alias is entered at the command line. Verify the currently defined command aliases. # MOTD banner set Console> (enable) Clearing the Login Banner To clear the login banner. This example shows how to configure the login banner on the switch using the # symbol as the beginning and ending delimiter: Console> (enable) set banner motd # Welcome to the Catalyst 6000 Switch! Unauthorized access prohibited.3 and 6.Chapter 20 Administering the Switch Defining Command Aliases Configuring a Login Banner To configure a login banner. Catalyst 6000 Family Software Configuration Guide—Releases 6. This example shows how to clear the login banner: Console> (enable) set banner motd ## MOTD banner cleared Console> (enable) Command set banner motd cc Defining Command Aliases You can use the set alias command to define command aliases (shorthand versions of commands) for frequently used or long and complex commands.4 78-13315-02 20-5 . Display the login banner by logging out and logging back into the switch.com for access. To define a command alias on the switch. perform this task in privileged mode: Task Step 1 Step 2 Command set banner motd c message_of_the_day c Enter the message of the day. Command aliases can save you time and can help prevent typing errors when you are configuring or monitoring the switch. The name argument defines the command alias. perform this task in privileged mode: Task Step 1 Step 2 Command set alias name command [parameter] [parameter] show alias [name] Define a command alias on the switch.

---------8 00-60-2f-45-26-2f 2. Console> (enable) show alias sm8 show module 8 sp8 show port 8 Console> (enable) sm8 Mod Module-Name Ports Module-Type Model Serial-Num Status --.--------. The ip_addr argument defines the IP address to which the name refers. To define an IP alias on the switch. and sp8 issues the show port 8 command.-----------------.----.-------------------------------------. sm8 and sp8.--------------------.0 1.---------. sm8 issues the show module 8 command. This example also shows how to verify the currently defined command aliases and what happens when you enter the command aliases at the command line: Console> (enable) set alias sm8 show module 8 Command alias added.------------------.-----8/1 notconnect trunk normal full 8/2 notconnect trunk normal full Port ----8/1 8/2 ifIndex ------285 286 Sw ----------------51.4 20-6 78-13315-02 .Chapter 20 Defining IP Aliases Administering the Switch This example shows how to define two command aliases.1(103) ----. Catalyst 6000 Family Software Configuration Guide—Releases 6.---------.3 and 6. Last-Time-Cleared -------------------------Thu Sep 10 1998.-----.3 Console> (enable) sp8 Port Name Status Vlan Level Duplex Speed Type ----. Verify the currently defined IP aliases. The name argument defines the IP alias.-----------45 DS3 ATM 45 DS3 ATM Use 'session' command to see ATM counters. Console> (enable) set alias sp8 show port 8 Command alias added. and other commands. telnet. IP aliases can make it easier to refer to other network devices when using ping.------8 2 DS3 Dual PHY ATM WS-X5166 007243262 ok Mod MAC-Address(es) Hw Fw --. even when DNS is not enabled.-----.--------. 16:56:08 Console> (enable) Defining IP Aliases You can use the set ip alias command to define textual aliases for IP addresses. perform this task in privileged mode: Task Step 1 Step 2 Command set ip alias name ip_addr show ip alias [name] Define an IP alias on the switch.

52. TFTP.0. Telnet. To configure a static route.52.20. The destination IP network address can be variably subnetted to support Classless Interdomain Routing (CIDR). The switch does not use the IP routing table to forward traffic from connected devices.0.16.127 Route added.3 cat6509 172. Console> (enable) set ip alias cat6509 172.52.52.71 Console> (enable) ping sparc sparc is alive Console> (enable) ping cat6509 cat6509 is alive Console> (enable) Configuring Static Routes Note For information on configuring a default gateway (default route). This example also shows how to verify the currently defined IP aliases and what happens when you use the IP aliases with the ping command: Console> (enable) set ip alias sparc 172. and the metric (hop count) for the route.4 78-13315-02 20-7 . Static route entries consist of the destination IP network address. only IP traffic generated by the switch itself (for example. You can specify the subnet mask (netmask) for a destination network using the number of subnet bits or using the subnet mask in dotted decimal format.20. If no subnet mask is specified.3 and 6. perform this task in privileged mode: Task Command set ip route destination[/netmask] gateway [metric] Step 1 Step 2 Configure a static route to the remote network. you might need to add a static routing table entry for one or more destination networks.71 IP alias added. This example shows how to configure a static route on the switch and how to verify that the route is configured properly in the routing table: Console> (enable) set ip route 172. see the “Configuring Default Gateways” section on page 3-6. The switch forwards IP traffic generated by the switch using the longest address match in the IP routing table. Console> (enable) show ip alias default 0. sparc refers to IP address 172.20. sparc and cat6509.0/20 172.71.Chapter 20 Administering the Switch Configuring Static Routes This example shows how to define two IP aliases. the IP address of the next hop router.20.3 IP alias added.0 sparc 172. and ping). and cat6509 refers to IP address 172. Console> (enable) show ip route Fragmentation Redirect Unreachable -----------------------------enabled enabled enabled Catalyst 6000 Family Software Configuration Guide—Releases 6.3. the default (classful) mask is used.52.52.16.20.20. Verify that the static route appears correctly in the show ip route IP routing table. In some situations.20.52.

120 172. you can configure a static or permanent ARP entry that maps the IP addresses of those devices to their MAC addresses.52.1. the ARP entry is retained even after a system reset.4 20-8 78-13315-02 .124 0xfffffff8 default default 0xff000000 Console> (enable) Flags ----UG UG U UH Use -------0 0 1 0 Interface --------sc0 sc0 sc0 sl0 Configuring Permanent and Static ARP Entries To enable your Catalyst LAN switch to communicate with devices that do not respond to Address Resolution Protocol (ARP) requests. (Optional) Specify the ARP aging time. When you configure a permanent ARP by using the set arp permanent command.1 00-80-1c-93-80-60 Permanent ARP entry added as 10. the entry is removed from the ARP cache after a system reset.1 00-80-1c-93-80-40 Static ARP entry added as 20. This example shows how to define a static ARP entry: Console> (enable) set arp static 20.121 Destination Gateway RouteMask --------------.---------172.20.20.1.--------------.1.1.16. you can configure an ARP entry to be statically or permanently entered into the ARP cache so that those devices can still be reached.1 at 00-80-1c-93-80-40 on vlan 1 Console> (enable) This example shows how to define a permanent ARP entry: Console> (enable) set arp permanent 10. perform this task in privileged mode: Task Step 1 Step 2 Step 3 Command set arp [dynamic | permanent | static] {ip_addr hw_addr} set arp agingtime seconds show arp Configure a static or permanent ARP entry.0 172.1 at 00-80-1c-93-80-60 on vlan 1 Console> (enable) This example shows how to set the ARP aging time: Console> (enable) set arp agingtime 300 ARP aging time set to 300 seconds.52.20.16.3 and 6. When you configure a static ARP entry using the set arp static command.121 0x0 172. Because most hosts support dynamic resolution.Chapter 20 Configuring Permanent and Static ARP Entries Administering the Switch The primary gateway: 172. Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. you usually do not need to specify static or permanent ARP cache entries.1.1.52. When a device does not respond to ARP requests. Verify the ARP configuration.1.1.127 0xfffff000 default 172.52. You can configure an ARP entry so that it does not age out by configuring it as either static or permanent.20.20.52. To configure a static or permanent ARP entry.

20. or permanent ARP entry. You can also use the schedule reset feature when trying out new features on a switch.52. you can set up the startup configuration feature and schedule a reset to occur in 30 minutes. and if connectivity is lost. clear arp [dynamic | permanent | static] {ip_addr hw_addr} Verify the ARP configuration.1 at 00-80-1c-93-80-60 on vlan 1 172. page 20-x Scheduling a Reset Within a Specified Amount of Time.1 at 00-60-5c-86-5b-28 port 8/1 on vlan 1 * 20. perform this task in privileged mode: Task Step 1 Step 2 Command Clear a dynamic.Permanent Arp Entries * . the system will reset in 30 minutes and return to the previous configuration.4 78-13315-02 20-9 . This feature allows you to upgrade software during business hours and schedule the system upgrade after business hours to avoid a major impact on users. page 20-x You can use the schedule reset command to schedule a system to reset at a future time.3 and 6. To avoid misconfiguration or the possibility of losing network connectivity to the device.Permanent Arp Entries * .Chapter 20 Administering the Switch Scheduling a System Reset This example shows how to display the ARP cache: Console> (enable) show arp ARP Aging time = 300 sec + .1. show arp This example shows how to clear all permanent ARP entries and verify the configuration: Console> (enable) clear arp permanent Permanent ARP entries cleared.1.1.1.Static Arp Entries + 10. Console> (enable) Console> (enable) show arp ARP Aging time = 300 sec + .20.1.1 at 00-80-1c-93-80-40 port 8/1 on vlan 1 Console> (enable) To clear ARP entries. You can then change the configuration.52. Catalyst 6000 Family Software Configuration Guide—Releases 6.Static Arp Entries 172.1 at 00-60-5c-86-5b-28 port 8/1 on vlan 1 * 20.1 at 00-80-1c-93-80-40 port 8/1 on vlan 1 Console> (enable) Scheduling a System Reset These sections describe how to schedule a system reset: • • Scheduling a Reset at a Specific Time.1. static.

Wed Aug 18 1999. Wed Aug 18 1999 (in 0 day 5 hours 40 minutes).3(1).4 20-10 78-13315-02 . Reset reason: Software upgrade to 5. Proceed with scheduled reset? (y/n) [n]? y Reset scheduled for 20:00:00.3(1). Wed Aug 18 1999 (in 0 day 8 hours 39 minutes). Entering the month and day argument with this command is optional. This example shows how to schedule a reset at a specific time: Console> (enable) reset at 20:00 Reset scheduled at 20:00:00.m.3(1). To schedule a reset at a specific time.m. Note The maximum scheduled reset time is 24 days. If you do not specify the month and day. if the current system time is 9:00 a.. Proceed with scheduled reset? (y/n) [n]? y Reset mindown scheduled for 23:00:00. Console> (enable) Scheduling a Reset Within a Specified Amount of Time You can schedule a reset within a specified time with the reset in command. Reset reason: Software upgrade to 5. Verify the scheduled reset. Console> (enable) This example shows how to schedule a reset with a minimum downtime: Console> (enable) reset mindown at 23:00 8/18 Software upgrade to 5. the reset will take place on the following day. For instance. the reset will take place on the current day if the time specified is later than the current time.Chapter 20 Scheduling a System Reset Administering the Switch Scheduling a Reset at a Specific Time You can specify an absolute time and date at which the reset should take place with the reset at command. If the time scheduled for reset is earlier than the current time.3 and 6. If the clock is advanced ahead of the scheduled reset time. If you or NTP advances the system clock to 10:00 a.3(1). Note The minimum downtime argument is valid only if the system has a standby supervisor engine. perform this task in privileged mode: Task Command reset [mindown] at {hh:mm} [mm/dd] [reason] show reset Step 1 Step 2 Schedule the reset time at a specific time. Proceed with scheduled reset? (y/n) [n]? y Reset scheduled for 23:00:00. and reset is scheduled in one hour. Reset scheduled at 23:00:00. the reset will take place 5 minutes after the current time.m.m. Console> (enable) This example shows how to schedule a reset at a specific time and include a reason for the reset: Console> (enable) reset at 23:00 8/18 Software upgrade to 5. the scheduled reset will take place at 10:00 a. Wed Aug 18 1999. Catalyst 6000 Family Software Configuration Guide—Releases 6. Reset scheduled at 23:00:00. Wed Aug 18 1999. Wed Aug 18 1999 (in 0 day 8 hours 39 minutes). the reset will take place at 11:00 a.

both power supplies must be of the same wattage. perform this task in privileged mode: Task Step 1 Step 2 Command reset [mindown] in [hh] {mm} [reason] show reset Schedule the reset time within a specific amount of time. Note The minimum downtime argument is valid only if the system has a standby supervisor engine. Verify the scheduled reset. refer to the Catalyst 6000 Family Installation Guide. certain switch configurations might require more power than a single power supply can provide. For detailed information on supported power supply configurations for each chassis. Catalyst 6000 family modules have different power requirements and. If one supply malfunctions. page 20-xi Using the CLI to Power Modules Up or Down. redundancy is not supported in this configuration.4 78-13315-02 20-11 . Reset reason: Configuration update Console> (enable) Power Management This section describes power management in the Catalyst 6000 family switches and includes the following information: • • • Enabling or Disabling Power Redundancy. Reset reason: Configuration update Proceed with scheduled reset? (y/n) [n]? y Reset scheduled for 19:56:01.3 and 6. page 20-xiii Determining System Power Requirements. the other supply can take over the entire system load. Although the power management feature allows you to power all installed modules with two power supplies. Enabling or Disabling Power Redundancy Enter the set power redundancy enable | disable command to enable or disable redundancy (redundancy is enabled by default). This example shows how to schedule a reset in a specified time: Console> (enable) reset in 5:20 Configuration update Reset scheduled in 5 hours 20 minutes. When you install and Catalyst 6000 Family Software Configuration Guide—Releases 6. The Catalyst 6000 family switches allow you to mix AC-input and DC-input power supplies in the same chassis. Redundant and nonredundant power configurations are discussed in the following sections. page 20-xiv Note In systems with redundant power supplies. Wed Aug 18 1999 (in 5 hours 20 minutes).Chapter 20 Administering the Switch Power Management To schedule a reset within a specified time. depending upon the wattage of the power supply. the total power drawn from both supplies is at no time greater than the capability of one supply. With redundancy enabled and two power supplies of equal wattage installed.

some modules are powered down and marked as power-deny in the show module Status field. Table 20-1 Effects of Power Supply Configuration Changes Configuration Change Redundant to nonredundant Effect • • • System log and syslog messages are generated. However. The system disables the lower wattage power supply. System power equals the power capability of one supply. You can change the configuration of the power supplies to redundant or nonredundant at any time. the lower wattage power supply that was disabled comes online and.4 20-12 78-13315-02 . System power is the power capability of the larger wattage supply. the power available to the system is the combined power capability of both power supplies. If there is not enough power for all previously powered-up modules. no software configuration is required. both power supplies are initially enabled. the system powers down some modules. The system powers up as many modules as the combined capacity allows. System power is increased to the combined power capability of both supplies. if one supply should fail and there is not enough power for all previously powered up modules. Table 1 describes how the system responds to changes in the power supply configuration. the higher wattage supply powers the system. In a nonredundant configuration. System power is the combined power capability of both supplies. With redundancy enabled. and if they are of the same wattage. both power supplies are enabled (even a power supply that was disabled because it was of a lower wattage than the other power supply). The modules marked as power-deny in the show module Status field are brought up if there is sufficient power. The modules marked as power-deny in the show module Status field are brought up if there is sufficient power. remain enabled. a syslog message displays and the lower wattage supply is disabled. If the active power supply fails.3 and 6. Load sharing and redundancy are enabled automatically. System log and syslog messages are generated.Chapter 20 Power Management Administering the Switch turn on two power supplies of equal wattage. No change in the module status because the power capability is unchanged. If you switch from a redundant to a nonredundant configuration. System log and syslog messages are generated. If you change from a nonredundant to a redundant configuration. if necessary. each concurrently provides approximately half of the required power to the system. modules are powered down to accommodate the lower wattage power supply. These modules are marked as power-deny in the show module Status field. both power supplies come online but a syslog message displays that the lower wattage power supply will be disabled. System log and syslog messages are generated. System log and syslog messages are generated. if you power up the system with two power supplies of unequal wattage. Nonredundant to redundant • • • Equal wattage power supply is inserted with redundancy enabled • • • Equal wattage power supply is inserted with redundancy disabled • • • Higher wattage power supply is inserted with redundancy enabled • • Catalyst 6000 Family Software Configuration Guide—Releases 6. If they are of different wattage.

some modules are powered down and marked as power-deny in the show module Status field. If the power supplies are of unequal wattage and the lower wattage supply is removed. System is booted with power supplies of different wattage installed and redundancy enabled System is booted with power supplies of equal or different wattage installed and redundancy disabled • • • • • System log and syslog messages are generated. the higher wattage supply powers the system. System log and syslog messages are generated. The module is marked as power-down in the show module Status field. the module status changes from power-down to power-deny. Using the CLI to Power Modules Up or Down You can power down a properly working module from the command-line interface (CLI) by entering the set module power down mod command. Catalyst 6000 Family Software Configuration Guide—Releases 6. If there is not enough power for all previously powered-up modules. System power is decreased to the power capability of one supply. The system disables the lower wattage power supply. Power supply is removed with redundancy enabled • • Power supply is removed with redundancy disabled • • • System log and syslog messages are generated. System log and syslog messages are generated. The modules marked as power-deny in the show module Status field are brought up if there is sufficient power. System log and syslog messages are generated. The system powers up as many modules as the combined capacity allows. System power equals the combined power capability of both supplies. and if there is not enough power for all previously powered-up modules.Chapter 20 Administering the Switch Power Management Table 20-1 Effects of Power Supply Configuration Changes (continued) Configuration Change Lower wattage power supply is inserted with redundancy enabled Higher or lower wattage power supply is inserted with redundancy disabled Effect • • • • • System log and syslog messages are generated. System power is increased to the combined power capability of both supplies. Enter the set module power up mod command to check if adequate power is available in the system to turn the power on for a module that was previously powered down. The lower wattage supply is disabled. there is no change in the module status because the power capability is unchanged. some modules are powered down and marked as power-deny in the show module Status field. If not enough power is available.3 and 6. If the power supplies are of equal wattage. If the power supplies are of unequal wattage and the higher wattage supply is removed.4 78-13315-02 20-13 . there is no change in the module status.

and 13-slot chassis.52A 1.46A 0.09A 1.4 20-14 78-13315-02 .52A Catalyst 6000 Family Software Configuration Guide—Releases 6.90A 3.40A 5. Table 20-2 Module Power Requirements Module Supervisor Engine 1: WS-X6K-SUP1A-2GE WS-X6K-SUP1-2GE Supervisor Engine 1 with PFC: WS-X6K-SUP1A-PFC Supervisor Engine 1 with PFC and MSFC: WS-X6K-SUP1A-MSFC Supervisor Engine 1 with PFC and MSFC2: WS-X6K-S1A-MSFC2 Supervisor Engine 2 with PFC2: WS-X6K-S2-PFC2 Supervisor Engine 2 with PFC2 and MSFC2: WS-X6K-S2-MSFC2 MSFC2 (spare): WS-F6K-MSFC2= Multilayer Switching Module: WS-X6302-MSM 24-Port 10BASE-FL: WS-X6024-10FL-MT Switch Fabric Modules: WS-C6500-SFM WS-X6500-SFM2 24-Port 100FX: WS-X6224-100FX-MT WS-X6324-100FX-SM WS-X6324-100FX-MM Power Requirement 1. See Table 2 to determine the exact power requirements for your configuration.79A 3. Note Enter the show environment power command to display current system power usage.20A 1.52A 2.30A 2.3 and 6.90A 1.70A 1.06A 3.Chapter 20 Power Management Administering the Switch Determining System Power Requirements This section describes how to determine the system power requirements for 6-. 9-.50A 3.70A 2.

4 78-13315-02 20-15 .59 3.00A 2.45A 2.69A 2. -SL OSM-16OC3-POS-MM. 1.167A (default) and WS-X6648-PWR modules) 0.54A Cisco IP Phone 7960 (when plugged into the WS-X6348-RJ-45 0. Catalyst 6000 Family Software Configuration Guide—Releases 6. -SI.98A 1.00A 1.50A.38A1 3. Based on the base FlexWAN module power draw plus a worst-case 15W per port adapter. initialization) The total power available with the 4000W power supply is 95. -SI. The total power available with the 1300W power supply is 27. -SI.39A 2.50A 5.00A 2. -SI.15A 3.09A 4.39A 2.81A 2.120A (after bootup.70A. -SL OSM-4OC12-POS-MM.46A..36A 4.78A 3. -SL OSM-10C48-POS-SS.69A 2.40A.Chapter 20 Administering the Switch Power Management Table 20-2 Module Power Requirements (continued) Module 48-Port 10/100TX: WS-X6248-RJ-45 WS-X6248-TEL WS-X6248A-TEL WS-X6348-RJ-45 WS-X6548-RJ-45 WS-X6648-PWR 8-Port Gigabit Ethernet: WS-X6408-GBIC WS-X6408A-GBIC 16-Port Gigabit Ethernet: WS-X6416-GBIC WS-X6416-GE-MT WS-X6316-GE-TX WS-X6516-GE-TX 1-Port OC-12 ATM: WS-X6101-OC12-MMF WS-X6101-OC12-SMF WAN module: WS-X6182-2PA (FlexWAN) Optical Services Modules: OSM-2OC12-POS-MM.90A 2. -SL OSM-8OC3-POS-MM.10A 2. -SI.3 and 6. -SL OSM-4GE-WAN (GBIC) Server load balancing: WS-X6066-SLB-APG 8-Port T1/E1 PSTN Interface: WS-X6608-T1 WS-X6608-E1 24-Port FXS Analog Interface: WS-X6624-FXS Power Requirement 2.25A 3.10A 2.69A 2.98A 1. The total power available with the 1000W power supply is 21. The total power available with the 2500W power supply is 55. plus margin.57A 5.

Catalyst 6000 Family Software Configuration Guide—Releases 6. This section describes how to monitor these critical system components. page 20-xvi Environmental Monitoring Using CLI Commands Enter the show test [mod] command to display the errors reported from the diagnostic tests. major and minor. LED Indications There are two alarm types. The following sections describe the environmental monitors: • • Environmental Monitoring Using CLI Commands. PASS is displayed in the Line Card Status field. When the system has an alarm (major or minor). refer to the Catalyst 6000 Family Module Installation Guide. Minor alarms are for informational purposes only.3 and 6. Note For additional information on LED indications. and temperature information) and information about the power available to the system. If the temperature falls 5°C (41°F) below the alarm threshold during this period. Enter the show environment [temperature | all | power] command to display system status information. power—(Optional) Displays environmental power information. power supply.4 20-16 78-13315-02 . the alarm is canceled. Keyword descriptions follow: • • • temperature—(Optional) Displays temperature information. If there are no errors. giving you notice of a problem that could turn critical if corrective action is not taken. test statistics are given for the general system and for the module in slot 1. Major alarms indicate a critical problem that could lead to the system being shut down. the alarm is not canceled or any action taken (such as a module reset or shutdown) for 5 minutes. Table 3 lists the environmental indicators for the supervisor engine and switching modules. indicating an overtemperature condition.Chapter 20 Environmental Monitoring Administering the Switch Environmental Monitoring Environmental monitoring of chassis components provides early warning indications of possible component failure to ensure safe and reliable system operation and avoid network interruptions. page 20-xvi LED Indications. enabling you to identify and rapidly correct hardware-related problems in your system. all—(Optional) Displays environmental status (for example. fan status. If you do not specify a module number.

If major alarm and the overtemperature condition is not corrected. the SYSTEM LED is red also. If there is no redundancy and the overtemperature condition is not corrected. the system shuts down after 5 minutes. Monitor the condition.3 and 6. See the “Power Management” section on page 20-xi for instructions. Temperature sensors monitor key supervisor engine components including daughter cards. Displaying System Status Information for Technical Support These sections describe how to display system status information for technical support: • • Generating a System Status Report. page 20-xviii Catalyst 6000 Family Software Configuration Guide—Releases 6.4 78-13315-02 20-17 . 2. 4. Power down the module4. The STATUS LED is red on the failed supervisor engine. system switches to redundant supervisor engine and the active supervisor engine shuts down. If there is no redundant supervisor. syslog message and SNMP trap generated. Supervisor engine temperature sensor exceeds minor threshold Minor STATUS LED orange STATUS LED red syslog message and SNMP trap generated. Redundant supervisor engine Major temperature sensor exceeds major or minor threshold Minor Switching module temperature sensor exceeds major threshold Switching module temperature sensor exceeds minor threshold Major STATUS LED orange STATUS LED red If minor alarm. the system shuts down after 5 minutes. page 20-xviii Using System Dump Files. Monitor the condition.Chapter 20 Administering the Switch Displaying System Status Information for Technical Support Table 20-3 Environmental Monitoring for Supervisor Engine and Switching Modules Component Supervisor engine temperature sensor exceeds major threshold1 Alarm Type Major LED Indication STATUS LED red 2 3 Action syslog message and SNMP trap generated. monitor the condition. If redundancy. syslog message and SNMP trap generated. A STATUS LED is located on the supervisor engine front panel and all module front panels. Minor STATUS LED orange 1. 3. syslog message and SNMP trap generated.

20. perform this task in privileged mode: Task Enable or disable the core dump feature.10 (y/n) [n]? y / Finished network upload. The previously active supervisor engine resets itself after the core dump is complete. If the switch has a redundant supervisor engine. VLANs.10 to a filename you supply. Command write tech-support {host} {filename} [module mod] [port mod/port] [vlan vlan] [memory] [config] This example shows a report sent to host 172. To enable or disable the core dump feature. Send images captured by the core dump or the stack dump to the Cisco TAC for analysis. and so forth. perform this task in privileged mode: Task Generate a system status report that you can send to TAC.10 tech. Enabling and Disabling the Core Dump A core dump produces a comprehensive report of images when your system fails due to a software error. If you do not specify any keywords. The information generated is useful when reporting a problem to Cisco Technical Assistance Center (TAC). This command is a combination of several show system status commands. By examining the core dump file.3 and 6. code. and stack segments.20.32. Enter the set system core-dump command to enable or disable the core dump feature.4 20-18 78-13315-02 . Console> (enable) write tech-support 172.Chapter 20 Displaying System Status Information for Technical Support Administering the Switch Generating a System Status Report Using a single command. where you can send it to TAC. (67784 bytes) Console> (enable) Using System Dump Files The core dump and the stack dump features generate reports that contain status information about your switch. This report contains system memory content. You can upload the output of the command to a TFTP server. To generate a report and upload the report to a TFTP server. a report for the entire system is generated. such as specific modules.txt on 172. you can generate a report that contains status information about your switch. Command set system core-dump {enable | disable} Catalyst 6000 Family Software Configuration Guide—Releases 6.20. so the complete status of the switch will be included in the report.32. No keywords are specified. including text.32. The core image is produced in Cisco core file format and is stored in the file system. the standby supervisor engine takes over automatically before the core dump occurs. ports. You can use keywords to limit the output to certain areas. TAC can analyze the error condition of a terminated process.txt Upload tech-report to tech.

perform this task in privileged mode: Task Specify the core image filename. (3) Selected core file is slot0:crash.4 78-13315-02 20-19 . Specifying the Core Image Filename Enter the set system core-file command to specify the core image filename.3 and 6. perform this task in normal mode: Task Display the stack dump. To specify the core image filename.hz (4) Please make sure the above device has been installed.hz System core-file set. An error process will generate a core image that is proportional to the size of the system DRAM. This image stack is displayed on the console and is also saved in the log area.” This command automatically checks the validity of the device name that you input. (2) Core file generation may take up to 20 minutes. The stack dump is automatic and becomes available when you enter the show log command after you reboot your system. Command set system core-file {device:filename} This example shows how to specify the core image filename: Console> (enable) set system core-file slot0:core. Command show log Catalyst 6000 Family Software Configuration Guide—Releases 6. To display log information. and ready to use Core-dump enabled Console> (enable) This example shows how to disable the core dump feature: Console> (enable) set system core-dump disable Core-dump disabled Console> (enable) The size of the file system depends on the size of your memory card.Chapter 20 Administering the Switch Displaying System Status Information for Technical Support This example shows how to enable the core dump feature: Console> (enable) set system core-dump enable (1) In the event of a system crash. Console> (enable) Displaying the Stack Dump A stack dump provides only the images related to a particular process that has caused the system to fail. this feature will cause a core file to be written out.hz. Make sure that you have enough memory available to store the core dump file. The default filename is “slot0:crash.

Catalyst 6000 Family Software Configuration Guide—Releases 6. Name = Console EPC: 807523F4 Stack content: sp+00: 00000000 80A75698 00000005 00000005 sp+10: BE000A00 00000000 83F84150 801194B8 sp+20: 80A75698 80A74BC8 80C8DBDC 000006E8 sp+30: 8006AF30 8006AE98 82040664 00000630 sp+40: 801AC744 801AC734 80A32488 80A32484 sp+50: 80A3249C 00000000 00000002 000009E4 sp+60: 8204067B 82040670 8011812C 81CAFC98 sp+70: 8011814C 82040670 8011812C 81CAFC98 sp+80: 00000002 000009E4 80110160 80110088 sp+90: 82040670 80A71EB4 81F1E9F8 00000004 sp+A0: 00000000 81F25EAC 81FF5750 00000000 sp+B0: 00000000 00000000 81F1E314 800840BC sp+C0: 0000000B 80084EB0 00000001 8073A358 sp+D0: 00000003 0000000D 00000000 0000000A sp+E0: 00000020 00000000 800831B4 0000001A sp+F0: 00000000 00000000 00000000 000D84F0 Register content: Status: 3401FC23 Cause: 00000024 AT: 81640000 V0: 00000007 V1: 00000007 A0: 00000000 A1: 80A756A6 A2: 00000011 A3: BE000BD0 T0: BFFFFFFE T1: 80000000 T2: 00000000 T3: 00000001 T4: 00000000 T5: 00000007 T6: 00000000 T7: 00000000 S0: 00000001 S1: 00000032 S2: 81F1E9F8 S3: 80A74BC8 S4: 80C8DBDC S5: 000006E8 S6: 00000000 S7: 00000000 T8: F0D09E3A T9: 82940828 K0: 3041C001 K1: 80C73038 GP: 811F39C0 SP: 83F84010 S8: 83F84010 RA: 807523F4 HIGH: 00000001 LOW: D5555559 BADVADDR: 7DFF7FFF ERR EPC: 58982466 GDB: Breakpoint Exception GDB: The system has trapped into the debugger.83) Process ID #52.2(0.3 and 6.Chapter 20 Displaying System Status Information for Technical Support Administering the Switch The following is an example of an image stack that may display after you enter the show log command: Breakpoint Exception occurred. GDB: It will hang until examined with gdb.4 20-20 78-13315-02 . Software version = 6.

page 21-iv Understanding How 802. This chapter consists of these sections: • • • • • • • • • Understanding How Authentication Works.1x Authentication Works. page 21-ii Understanding How Login Authentication Works. and accounting (AAA) to monitor and control access to the command-line interface (CLI) on the Catalyst 6000 family switches. page 21-xlviii Understanding How Authorization Works.4 78-13315-02 21-1 . authorization. page 21-ii Understanding How TACACS+ Authentication Works. page 21-lvii Configuring Accounting. page 21-i Configuring Authentication.3 and 6. page 21-l Configuring Authorization. page 21-iv Understanding How Kerberos Authentication Works. page 21-ix Authentication Example. page 21-lii Authorization Example. page 21-vii Catalyst 6000 Family Software Configuration Guide—Releases 6. page 21-iii Understanding How RADIUS Authentication Works.C H A P T E R 21 Configuring Switch Access Using AAA This chapter describes how to configure authentication. page 21-lvi Understanding How Accounting Works. Note For complete syntax and usage information for the commands used in this chapter. page 21-lix Accounting Example. page 21-ii Understanding How Local Authentication Works. page 21-lxiii Understanding How Authentication Works These sections describe how the different authentication methods work: • • • • • • • Authentication Overview. refer to the Catalyst 6000 Family Command Reference publication.

1x authentication Note Kerberos authentication does not work if TACACS+ is used as the authentication method. local authentication is always attempted last. you can specify different authentication methods for console and Telnet connections. However. if you disable all other authentication methods. Understanding How Login Authentication Works Login authentication increases the security of the system by keeping unauthorized users from guessing the password. Setting the login authentication to zero (0) disables the login limit checking. However.3 and 6. SNMP traps and syslog messages are generated and the lockout restriction occurs. the system disables execution of the enable command for the lockout period. When you enable local authentication with one or more other authentication methods. The switch attempts local authentication only if the other authentication methods fail. The configurable range is 30 to 600 seconds. when local authentication is disabled. You can enable login authentication access attempts within a range of three (the default) to ten tries. Catalyst 6000 Family Software Configuration Guide—Releases 6. The login and enable passwords are local to each switch and are not mapped to individual user names. By default. For example. You can enable local authentication and one or more of the other authentication methods at the same time. The user is limited to a specific number of attempts to successfully log in to the switch. you might use local authentication for console connections and RADIUS authentication for Telnet connections. If the user fails to authorize the password. the system delays accesses and captures the user ID and the IP address of the station in the syslog and in the SNMP trap. local authentication is enabled. If a user attempts to log in to privileged mode and fails. Understanding How Local Authentication Works Local authentication uses locally configured login and enable passwords to authenticate login attempts. When a user reaches the set limit without successfully logging in. If a user is locked out with a Telnet session. local authentication is reenabled automatically. You can disable local authentication only after enabling one or more of the other authentication methods. The lockout time is configurable from the CLI and SNMP. the console does not allow the user to log in during that lockout time. the connection closes when the limit is reached. and any subsequent accesses from that station are closed immediately (with proper notice) by the switch during the lockout time.Chapter 21 Understanding How Authentication Works Configuring Switch Access Using AAA Authentication Overview You can configure any combination of these authentication methods to control access to the switch: • • • • • • Login authentication Local authentication RADIUS authentication TACACS+ authentication Kerberos authentication 802. If a user is locked out at the console.4 21-2 78-13315-02 .

and the total packet length. TACACS+ authentication usually occurs in these instances: • • When you first log on to a machine When you send a service request that requires privileged access When you request privileged or restricted services. When local authentication is disabled. local authentication is reenabled automatically. TACACS+ uses TCP to ensure reliable delivery and encrypt all traffic between the TACACS+ server and the TACACS+ daemon on a network device. and challenge-response authentication. TACACS+ is an enhanced version of TACACS. The TACACS+ protocol then forwards the packet to the TACACS+ server. authorization. When the TACACS+ server receives the packet. the packet sequence number. You can configure the following TACACS+ parameters on the switch: • • • • • • • Enable or disable TACACS+ authentication to determine if a user has permission to access the switch Enable or disable TACACS+ authentication to determine if a user has permission to enter privileged mode Specify a key used to encrypt the protocol packets Specify the server on which the TACACS+ server daemon resides Set the number of login attempts allowed Set the timeout interval for server daemon response Enable or disable the directed-request option TACACS+ authentication is disabled by default. If you do not configure a TACACS+ key. This challenge-response process can continue through multiple iterations until authentication either passes or fails. a User Datagram Protocol (UDP)-based access-control protocol specified by RFC 1492. The TACACS+ clients and servers use the key to encrypt all TACACS+ packets transmitted.3 and 6. Notifies the client that authentication will continue and that the client must provide additional information. including fixed password. while all part of TACACS+. one-time password. TACACS+ works with many authentication types. This header information identifies the packet type being sent (for example. are independent of one another. A TACACS+ server can provide authentication. packets are not encrypted. If you configure a key on the switch. the encryption type used. and accounting functions. These services. TACACS+ encrypts your user password information using the MD5 encryption algorithm and adds a TACACS+ packet header.Chapter 21 Configuring Switch Access Using AAA Understanding How Authentication Works Understanding How TACACS+ Authentication Works TACACS+ controls access to network devices by exchanging Network Access Server (NAS) information between a network device and a centralized database to determine the identity of a user or an entity. if you disable all other authentication methods. it must be the same as the one configured on the TACACS+ servers.4 78-13315-02 21-3 . You can configure a TACACS+ key on the client and server. so a given TACACS+ configuration can use any or all of the three services. an authentication packet). Catalyst 6000 Family Software Configuration Guide—Releases 6. You can enable TACACS+ authentication and local authentication at the same time. it does the following: • • Authenticates the user information and notifies the client that authentication has either passed or failed.

3 and 6. other than the Kerberos server. refer to RFC 2138. You can enable RADIUS authentication and other authentication methods at the same time. this trusted server is called the key distribution center (KDC). You can specify which method to use first using the primary keyword. You can configure a RADIUS key on the client and server.4 21-4 78-13315-02 . for more than a few seconds. Note For more information about how the RADIUS protocol operates. If you do not configure a RADIUS key. If the standard user password method is used. passwords are not stored on any machine. local authentication is reenabled automatically. it must be the same as the one configured on the RADIUS servers. A ticket is a temporary set of electronic credentials that verifies the identity of a client for a particular service. Catalyst 6000 Family Software Configuration Guide—Releases 6. “Remote Authentication Dial In User Service (RADIUS). Kerberos encrypts user passwords into the tickets. In Kerberos. If you configure a key on the client. passing user information to one or more RADIUS servers. RADIUS uses UDP for transport between the RADIUS client and server.” You can configure the following RADIUS parameters on the switch: • • • • • • • Enable or disable RADIUS authentication to control login access Enable or disable RADIUS authentication to control enable access Specify the IP addresses and UDP ports of the RADIUS servers Specify the RADIUS key used to encrypt RADIUS packets Specify the RADIUS server timeout interval Specify the RADIUS retransmit count Specify the RADIUS server deadtime interval RADIUS authentication is disabled by default. packets are not encrypted.Chapter 21 Understanding How Authentication Works Configuring Switch Access Using AAA Understanding How RADIUS Authentication Works RADIUS is a client-server authentication and authorization access protocol used by the NAS to authenticate users attempting to connect to a network device. ensuring that passwords are not sent on the network in clear text. Understanding How Kerberos Authentication Works Kerberos is a client-server based secret-key network authentication method that uses a trusted Kerberos server to verify secure access to both services and users. if you disable all other authentication methods. These tickets have a limited life span and can be used in place of the standard user password pair authentication mechanism if a service trusts the Kerberos server that issued the ticket. Kerberos also guards against intruders who might pick up the encrypted tickets from the network. When local authentication is disabled. When you use Kerberos. The key itself is never transmitted over the network. The NAS permits or denies network access to a user based on the response it receives from one or more RADIUS servers. The KDC issues tickets to validate users and services. The RADIUS clients and servers use the key to encrypt all RADIUS packets transmitted. The NAS functions as a client.

A password that a network service shares with the KDC. and network services that are registered to a Kerberos server.) The Kerberos principal is who you are or what a service is according to the Kerberos server. The Kerberos server is trusted to verify the identity of a user or network service to another user or network service. (See Kerberos principal. Credentials have a default life span of eight hours.) A domain consisting of users. The network service authenticates an encrypted service credential by using the SRVTAB (also known as a KEYTAB) to decrypt it. Users and network services register their identity with the Kerberos server. Table 21-1 Kerberos Terminology Term Kerberized Kerberos credential Definition Applications and services that have been modified to support the Kerberos credential infrastructure.Chapter 21 Configuring Switch Access Using AAA Understanding How Authentication Works Table 1 defines the terms used in Kerberos. A credential for a network service. Kerberos credentials verify the ticket of a user or service. Kerberos realms must always be in uppercase characters. General term referring to authentication tickets. this credential is encrypted with the password shared by the network service and the KDC and with the user’s TGT. Note Kerberos authentication does not work if TACACS+ is used as the authentication mechanism. When users receive a TGT. such as ticket granting tickets (TGTs) and service credentials. A credential that the KDC issues to authenticated users. Telnet clients and servers through both the console and in-band management port can be Kerberized. Kerberos identity Kerberos principal Kerberos realm Kerberos server Key distribution center (KDC) Service credential SRVTAB Ticket granting ticket (TGT) In the Catalyst 6000 family switches. If a network service decides to trust the Kerberos server that issued the ticket. Network services query the Kerberos server to authenticate to other network services. they can authenticate to network services within the Kerberos realm represented by the KDC. A daemon running on a network host. A Kerberos server and database program running on a network host that allocates the Kerberos credentials to different users or network services. (Also known as a Kerberos identity. you cannot use a Kerberized login procedure. When issued from the KDC. Catalyst 6000 Family Software Configuration Guide—Releases 6. Note If you are logged in to the console through a modem or a terminal server. hosts.4 78-13315-02 21-5 .3 and 6. the Kerberos credential can be used in place of retyping in a username and password.

The Telnet client asks the user for the username and issues a request for a TGT to the KDC on the Kerberos server. If the Telnet client has been instructed to do so. The client then builds a service credential request and sends this to the KDC. the KDC’s identity. you will follow this process when attempting to Telnet to the switch: 1. 2. The KDC then encrypts the credential with the password that it shares with the switch’s Telnet server and encrypts the resulting packet with the Telnet client’s TGT and sends this packet to the client. and the TGT’s expiration time. Figure 21-1 Kerberized Telnet Connection Host (Telnet client) 1 2 3 4 5 6 6000 Kerberos server (contains KDC) Catalyst 6500 series switches Catalyst 6000 Family Software Configuration Guide—Releases 6. This request contains the user’s identity and a message saying that it wants to Telnet to the switch. If encryption is successful. This step ensures that the user does not need to get another TGT in order to use another network service from the switch.3 and 6. When the Telnet client and services have been Kerberized. The KDC creates the TGT. the user is successfully authenticated to the KDC.4 21-6 30794 78-13315-02 . the packet is still encrypted with the password that the switch’s Telnet server and the KDC share. When the KDC successfully decrypts the service credential request with the TGT that it issued to the client. The service credential has the client’s identity and the identity of the desired Telnet server.Chapter 21 Understanding How Authentication Works Configuring Switch Access Using AAA Using Kerberized Login Procedure You can use a Kerberized Telnet session if you are logging in through the in-band management port. 3. 5. The KDC then encrypts the TGT with the user’s password and sends the TGT to the client. At this point. 4. it builds a service to the switch. the client then sends the resulting packet to the switch’s Telnet server. If the Telnet client can decrypt the TGT with the entered password. When the Telnet client receives the encrypted TGT. which contains the user’s identity. it forwards the TGT to the switch. it prompts the user for the password. This request is encrypted using the TGT. Figure 1 shows the Kerberos Telnet connection process. The Telnet client decrypts the packet first with its TGT. 6.

KDC’s identity. If you want to access other network services. the KDC must be contacted directly for authentication. Catalyst 6000 Family Software Configuration Guide—Releases 6. Figure 2 shows the non-Kerberized login process. 4. Telnet does not support non-Kerberized login. the user password is now transferred in clear text from the login client to the switch. 3.4 78-13315-02 55510 21-7 . 5. 802. the following process takes place: 1. However. After authentication is successful. The KDC sends an encrypted TGT to the switch. you are authenticated to the switch. the switch takes care of authentication to the KDC on behalf of the login client. Until the device is authenticated. The switch prompts you for a username and password. 2. 802.1x is a client-server-based access control and authentication protocol that restricts unauthorized devices from connecting to a LAN through publicly accessible ports. normal traffic can pass through the port. To obtain the TGT.Chapter 21 Configuring Switch Access Using AAA Understanding How Authentication Works Using a Non-Kerberized Login Procedure If you use a non-Kerberized login procedure to log in to the switch. The switch requests a TGT from the KDC so that you can be authenticated to the switch. If the decryption is successful. The switch tries to decrypt the TGT with the password that you entered.1x access control allows only Extensible Authentication Protocol over LAN (EAPOL) traffic through the port to which the device is connected.1x Authentication Works IEEE 802. you can run the program “kinit. If you launch a non-Kerberized login. and TGT’s expiration time. which contains your identity.3 and 6.1x authenticates each user device connected to a switch port before making available any services offered by the switch or the LAN.” the client software provided with the Kerberos package. Note A non-Kerberized login can be performed through a modem or terminal server through the in-band management port. Figure 21-2 Non-Kerberized Telnet Connection Host (Telnet client) Kerberos server (contains KDC) 1 2 3 Catalyst switch Understanding How 802.

Bidirectional flow control. Flow control only on incoming frames in an unauthorized switch port. Single point of attachment to the LAN infrastructure (for example. PAE=port access entity Catalyst 6000 Family Software Configuration Guide—Releases 6. Status of the port before the supplicant PAE is authorized. All traffic through the single port is available to both access points. One access point is an uncontrolled port. It checks the credentials of the supplicant PAE and then notifies its client. Table 2 defines the terms used in 802. The controlled port is open only when the device connected to the port has been authorized by 802. the other is a controlled port. EAPOL=Extensible Authorization Protocol over LAN 2. the controlled port opens. The authenticator is independent of the actual authentication method and functions only as a pass-through for the authentication exchange. which is always open.3 and 6.4 21-8 78-13315-02 . allowing normal traffic to pass.1x. After this authorization takes place. submits the information from the supplicant to the authentication server. Protocol object associated with a specific system port. It communicates with the supplicant. Protocol data unit. Extensible Authentication Protocol. Unsecured access point that allows the uncontrolled exchange of PDUs. incoming and outgoing. whether the supplicant PAE is authorized to access the LAN/switch services.1x Terminology Term Authenticator PAE Definition (Referred to as the “authenticator”) entity at one end of a point-to-point LAN segment that enforces supplicant authentication. and authorizes the supplicant when instructed to do so by the authentication server.1x controls network access by creating two distinct virtual access points at each port. 1 Authentication server Authorized state Both Controlled port EAP EAPOL In Port PAE2 PDU RADIUS Supplicant PAE Encapsulated EAP messages that can be handled directly by a LAN MAC service.Chapter 21 Understanding How Authentication Works Configuring Switch Access Using AAA 802. Only EAPOL traffic is allowed to pass through the uncontrolled port. (Referred to as the “supplicant”) entity that requests access to the LAN/switch services and responds to information requests from the authenticator. Secured access point. MAC bridge ports). the authenticator PAE. Remote Access Dial-In User Service. Status of the port after the supplicant PAE is authorized. Table 21-2 802.1x. Entity that provides the authentication service for the authenticator PAE. Unauthorized state Uncontrolled port 1. at an unauthorized switch port.

You can use other protocols.1x Authentication. page 21-xvii Configuring RADIUS Authentication. page 21-xxxi Configuring 802. but we recommend RADIUS for authentication.1x standard.1x parameters on the switch: • • • • • • • • • • Force-Authorized. page 21-xi Configuring Login Authentication. particularly when the authentication server is located remotely. or Automatic 802. page 21-xii Configuring Local Authentication. because RADIUS has extensions that support encapsulation of EAP frames built into it. Force-Unauthorized.4 78-13315-02 21-9 .Chapter 21 Configuring Switch Access Using AAA Configuring Authentication Traffic Control You can restrict traffic in both directions or just incoming traffic.3 and 6.1x port control Enable or disable multiple hosts on a specific port Enable or disable system authentication control Specify quiet time interval Specify the authenticator to supplicant retransmission time interval Specify the back-end authenticator to supplicant retransmission time interval Specify the back-end authenticator to authentication server retransmission time interval Specify the number of frames retransmitted from the back-end authenticator to supplicant Specify the automatic supplicant reauthentication time interval Enable or disable automatic supplicant reauthentication Configuring Authentication These sections describe how to configure the different authentication methods: • • • • • • • • • Authentication Default Configuration. page 21-xl Authentication Example. page 21-xxiii Configuring Kerberos Authentication. Authentication Server The frames exchanged between the authenticator and the authentication server are dependent on the authentication mechanism. page 21-x Authentication Configuration Guidelines. page 21-xiii Configuring TACACS+ Authentication. so they are not defined by the 802. 802.1x Parameters Configurable on the Switch You can configure these 802. page 21-xlviii Catalyst 6000 Family Software Configuration Guide—Releases 6.

1x back-end authenticator to supplicant retransmission time Default Value Enabled Enabled Disabled Disabled None specified 3 5 seconds Disabled Disabled Disabled None specified Port 1812 None specified 5 seconds 0 (servers not marked dead) 2 times Disabled Disabled None specified None specified Port 750 NULL string Disabled Not mandatory Disabled Force-Authorized Disabled Enable 60 seconds 30 seconds 30 seconds Catalyst 6000 Family Software Configuration Guide—Releases 6.1x port control 802.3 and 6.1x authenticator to supplicant retransmission time 802.1x system authentication control 802.4 21-10 78-13315-02 . Table 21-3 Authentication Default Configuration Feature Login authentication (console and Telnet) Local authentication (console and Telnet) TACACS+ login authentication (console and Telnet) TACACS+ enable authentication (console and Telnet) TACACS+ key TACACS+ login attempts TACACS+ server timeout TACACS+ directed request RADIUS login authentication (console and Telnet) RADIUS enable authentication (console and Telnet) RADIUS server IP address RADIUS server UDP auth-port RADIUS key RADIUS server timeout RADIUS server deadtime RADIUS retransmit attempts Kerberos login authentication (console and Telnet) Kerberos enable authentication (console and Telnet) Kerberos server IP address Kerberos DES key Kerberos server auth-port Kerberos local-realm name Kerberos credentials forwarding Kerberos clients mandatory Kerberos preauthentication 802.1x multiple hosts 802.Chapter 21 Configuring Authentication Configuring Switch Access Using AAA Authentication Default Configuration Table 3 shows the default authentication configuration.1x quiet period time 802.

You cannot enable 802.1x number of frames retransmitted from back-end authenticator to supplicant 802.1x on a trunk port until you turn off the trunking feature on that port. You cannot enable DVLAN on an 802. However.1x on a dynamic port until you turn off the DVLAN feature on that port.1x port. You can specify a server as primary by using the primary keyword. but we recommend RADIUS.1x on a switched port analyzer (SPAN) destination port. the first server configured is the primary server and authentication requests are sent to this server first. particularly with a remotely located authentication server.1x port as a SPAN source port.1x back-end authenticator to authentication server retransmission time 802.1x will work with other protocols. You cannot enable channeling on an 802.1x port. You cannot enable an auxiliary VLAN ID on an 802. Kerberos authentication does not work if TACACS+ is also used as an authentication mechanism. You must specify a RADIUS or TACACS+ server before enabling RADIUS or TACACS+ on the switch. You cannot enable 802. You cannot enable 802.4 78-13315-02 21-11 .1x is only supported on Ethernet ports.1x on a secure port until you turn off the security feature on that port. If you configure multiple RADIUS or TACACS+ servers. • • • • • • • • • • • • • Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.1x port. RADIUS and TACACS+ support one privileged mode only (level 1). make sure you configure an identical key on the RADIUS or TACACS+ server. you can configure an 802. You cannot enable 802.1x port.1x port.1x on a channeling port until you turn off the channeling feature on that port.1x automatic supplicant reauthentication time 802. 802.1x automatic authenticator reauthentication of supplicant Default Value 30 seconds 2 3600 seconds Disabled Authentication Configuration Guidelines Follow these guidelines when configuring authentication on the switch: • Authentication configuration applies both to console and Telnet connection attempts unless you use the console and telnet keywords to specify the authentication methods to use for each connection type individually. You cannot enable 802. You cannot configure SPAN destination on an 802. You cannot enable trunking on an 802.Chapter 21 Configuring Switch Access Using AAA Configuring Authentication Table 21-3 Authentication Default Configuration (continued) Feature 802. You cannot enable 802. 802.1x port.1x on a Multiple VLAN Access Port (MVAP) with an auxiliary VLAN ID until you turn off the auxiliary VLAN ID feature on that port. If you configure a RADIUS or TACACS+ key on the switch. You cannot enable security on an 802.

page 21-xiii Setting Authentication Login Attempts on the Switch To set up login authentication on the switch. Enter the console or telnet keyword if you want to enable local authentication only for the console port or for Telnet connection attempts. Verify the local authentication configuration. Console> (enable) set authentication login lockout 50 Login lockout time for console and telnet logins set to 50. set the lockout time for both console and Telnet connections to 50 seconds.4 21-12 78-13315-02 . Enter set authentication login lockout {time} [console | telnet] the console or telnet keyword if you want to enable local authentication only for the console port or for Telnet connection attempts. page 21-xii Setting Authentication Login Attempts for the Privileged Mode. Console> (enable) show authentication Login Authentication: --------------------tacacs radius kerberos local attempt limit lockout timeout (sec) Enable Authentication: ---------------------tacacs radius kerberos local attempt limit lockout timeout (sec) Console> (enable) Console Session ---------------disabled disabled disabled enabled(primary) 5 50 Console Session ----------------disabled disabled disabled enabled(primary) 3 disabled Telnet Session ---------------disabled disabled disabled enabled(primary) 5 50 Telnet Session ---------------disabled disabled disabled enabled(primary) 3 disabled Http Session ---------------disabled disabled disabled enabled(primary) Http Session ---------------disabled disabled disabled enabled(primary) - Catalyst 6000 Family Software Configuration Guide—Releases 6. Step 2 Enable the login lockout time on the switch. show authentication Step 3 This example shows how to limit login attempts to five.Chapter 21 Configuring Authentication Configuring Switch Access Using AAA Configuring Login Authentication These sections describe how to configure login authentication on the switch: • • Setting Authentication Login Attempts on the Switch. and verify the configuration: Console> (enable) set authentication login attempt 5 Login authentication attempts for console and telnet logins set to 5.3 and 6. perform this task in privileged mode: Task Step 1 Command set authentication login attempt {count} [console | telnet] Enable login attempt limits on the switch.

3 and 6. Enter the console or telnet keyword if you [console | telnet] want to enable local authentication only for the console port or for Telnet connection attempts. set authentication enable lockout {time} Enable the login lockout time for privileged mode. Enter the console or telnet keyword if you [console | telnet] want to enable local authentication only for the console port or for Telnet connection attempts. show authentication Step 2 Step 3 This example shows how to limit enable mode login attempts to five. Console> (enable) set authentication enable lockout 50 Enable mode lockout time for console and telnet logins set to 50. page 21-xvi Catalyst 6000 Family Software Configuration Guide—Releases 6. page 21-xv Recovering a Lost Password.4 78-13315-02 21-13 . page 21-xv Disabling Local Authentication. and verify the configuration: Console> (enable) set authentication enable attempt 5 Enable mode authentication attempts for console and telnet logins set to 5. Console> (enable) show authentication Login Authentication: --------------------tacacs radius kerberos local attempt limit lockout timeout (sec) Enable Authentication: ---------------------tacacs radius kerberos local attempt limit lockout timeout (sec) Console> (enable) Console Session ---------------disabled disabled disabled enabled(primary) 5 50 Console Session ----------------disabled disabled disabled enabled(primary) 5 50 Telnet Session ---------------disabled disabled disabled enabled(primary) 5 50 Telnet Session ---------------disabled disabled disabled enabled(primary) 5 50 Http Session ---------------disabled disabled disabled enabled(primary) Http Session ---------------disabled disabled disabled enabled(primary) - Configuring Local Authentication These sections describe how to configure local authentication on the switch: • • • • • Enabling Local Authentication. Verify the local authentication configuration. set the enable mode lockout time for both console and Telnet connections to 50 seconds. page 21-xiv Setting the Enable Password. perform this task in privileged mode: Task Step 1 Command set authentication enable attempt {count} Enable the login attempt limits for privileged mode. page 21-xiv Setting the Login Password.Chapter 21 Configuring Switch Access Using AAA Configuring Authentication Setting Authentication Login Attempts for the Privileged Mode To set up login authentication for privileged mode.

perform this task in privileged mode: Task Command Step 1 Enable local login authentication on the switch.4 to activate case sensitivity.3 and 6. and use any printable character.4 remain non-case sensitive. and how to verify the configuration: Console> (enable) set authentication login local enable local login authentication set to enable for console and telnet session.4 21-14 78-13315-02 . set authentication login local enable [all | Enter the console or telnet keyword if you want to console | http | telnet] enable local authentication only for console port or Telnet connection attempts. Console> (enable) show authentication Login Authentication: --------------------tacacs radius kerberos local Enable Authentication: ---------------------tacacs radius kerberos local Console> (enable) Console Session ---------------disabled disabled disabled enabled(primary) Console Session ----------------disabled disabled disabled enabled(primary) Telnet Session ---------------disabled disabled disabled enabled(primary) Telnet Session ---------------disabled disabled disabled enabled(primary) Setting the Login Password The login password controls access to the user mode CLI. Console> (enable) set authentication enable local enable local enable authentication set to enable for console and telnet session. Catalyst 6000 Family Software Configuration Guide—Releases 6. Note Passwords set in releases prior to software release 5. set authentication enable local enable [all | Enter the console or telnet keyword if you want to console | http | telnet] enable local authentication only for console port or Telnet connection attempts. show authentication Step 2 Step 3 This example shows how to enable local login. contain up to 30 characters. To enable local authentication on the switch.Chapter 21 Configuring Authentication Configuring Switch Access Using AAA Enabling Local Authentication Note Local login and enable authentication are enabled for both console and Telnet connections by default. Enable local enable authentication on the switch. Passwords are case sensitive. You do not need to perform this task unless you want to modify the default configuration or you have disabled local authentication. Verify the local authentication configuration. how to enable authentication for both console and Telnet connections. You must reset the password after installing software release 5. including a space.

enter your new password. Passwords are case sensitive. Enter your set enablepass old password (press Return on a switch with no password configured). and use any printable character.3 and 6. or if the RADIUS or TACACS+ server is not online. Enter your old set password password (press Return on a switch with no password configured). Catalyst 6000 Family Software Configuration Guide—Releases 6. you may be unable to log in to the switch.4 remain non-case sensitive. perform this task in privileged mode: Task Command Set the login password for access. enter your new password.Chapter 21 Configuring Switch Access Using AAA Configuring Authentication To set the login password for local authentication. contain up to 30 characters.4 to activate case sensitivity. If you disable local authentication and RADIUS or TACACS+ is not configured correctly. You must reset the password after installing software release 5.4 78-13315-02 21-15 . Note Passwords set in releases prior to software release 5. This example shows how to set the login password on the switch: Console> (enable) set password Enter old password: <old_password> Enter new password: <new_password> Retype new password: <new_password> Password changed. and reenter your new password. To set the enable password for local authentication. perform this task in privileged mode: Task Command Set the password for privileged mode. including a space. This example shows how to set the enable password on the switch: Console> (enable) set enablepass Enter old password: <old_password> Enter new password: <new_password> Retype new password: <new_password> Password changed. Console> (enable) Disabling Local Authentication Caution Make sure that RADIUS or TACACS+ authentication is configured and operating correctly before disabling local login or enable authentication. Console> (enable) Setting the Enable Password The login password controls access to the user mode CLI. and reenter your new password.

Console> (enable) show authentication Login Authentication: --------------------tacacs radius kerberos local Enable Authentication: ---------------------tacacs radius kerberos local Console> (enable) Console Session ---------------disabled enabled(primary) disabled disabled Console Session ----------------disabled enabled(primary) disabled disabled Telnet Session ---------------disabled enabled(primary) disabled disabled Telnet Session ---------------disabled enabled(primary) disabled disabled Recovering a Lost Password Use the following procedure to recover a lost local authentication password. You cannot recover the password if you are connected through a Telnet connection. This example shows how to disable local login authentication. Enter the reset system command to reboot the switch.3 and 6. show authentication Step 2 Step 3 Note You must have either RADIUS or TACACS+ authentication enabled before you disable local authentication. repeat the process for each password. how to enable authentication for both console and Telnet connections. Console> (enable) set authentication enable local disable local enable authentication set to disable for console and telnet session. set authentication login local disable [all | Enter the console or telnet keyword if you want to console | http | telnet] disable local authentication only for console port or Telnet connection attempts. Catalyst 6000 Family Software Configuration Guide—Releases 6.4 21-16 78-13315-02 . perform the following task in privileged mode: Step 1 Step 2 Connect to the switch through the supervisor engine console port. set authentication enable local disable [all | Enter the console or telnet keyword if you want to console | http | telnet] disable local authentication only for console port or Telnet connection attempts. You must complete Steps 3 through 7 within 30 seconds of a power cycle or the recovery will fail. To recover a lost password. If you lost both the login and enable passwords. perform this task in privileged mode: Task Step 1 Command Disable local login authentication on the switch. Disable local enable authentication on the switch. Verify the local authentication configuration.Chapter 21 Configuring Authentication Configuring Switch Access Using AAA To disable local authentication on the switch. and how to verify the configuration: Console> (enable) set authentication login local disable local login authentication set to disable for console and telnet session.

3 and 6.20.52. Enter and confirm your new password.52.52. press Return. Configuring TACACS+ Authentication These sections describe how to configure TACACS+ authentication on the switch: • • • • • • • • • • Specifying TACACS+ Servers. To specify one or more TACACS+ servers. The first server you specify is the primary server. Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. At the “Enter Password” prompt.4 78-13315-02 21-17 . show tacacs This example shows how to specify TACACS+ servers and verify the configuration: Console> (enable) set tacacs server 172. page 21-xviii Specifying the TACACS+ Key. (The enable password is null for 30 seconds when you are connected to the console port. Console> (enable) set tacacs server 172.10 172.20. page 21-xxi Clearing TACACS+ Servers.Chapter 21 Configuring Switch Access Using AAA Configuring Authentication Step 3 Step 4 Step 5 Step 6 Step 7 Step 8 At the “Enter Password” prompt.3 added to TACACS server table as primary server.20. page 21-xxii Clearing the TACACS+ Key. page 21-xix Specifying the TACACS+ Timeout Interval. page 21-xix Specifying the TACACS+ Login Attempts. Enter privileged mode using the enable command.2 primary 172.20. When prompted for your old password. perform this task in privileged mode: Task Step 1 Step 2 Command Specify the IP address of one or more TACACS+ set tacacs server ip_addr [primary] servers.52. press Return.2 added to TACACS server table as primary server. page 21-xxiii Specifying TACACS+ Servers Specify one or more TACACS+ servers before you enable TACACS+ authentication on the switch. page 21-xxi Disabling TACACS+ Directed Request. Console> (enable) set tacacs server 172. page 21-xvii Enabling TACACS+ Authentication. Verify the TACACS+ configuration.52. press Return.) Enter the set password or set enablepass command.20.52. The login password is null for 30 seconds when you are connected to the console port. as appropriate.10 added to TACACS server table as backup server. page 21-xxii Disabling TACACS+ Authentication.3 172. unless you explicitly make one server the primary using the primary keyword. page 21-xx Enabling TACACS+ Directed Request.20.

set authentication enable tacacs enable [all | Enable TACACS+ authentication for enable mode.20. you can use the primary keyword to force the switch to try TACACS+ authentication first. To enable TACACS+ authentication. You can enable TACACS+ authentication for login and enable access to the switch. Catalyst 6000 Family Software Configuration Guide—Releases 6.52. show authentication Step 2 Step 3 This example shows how to enable TACACS+ authentication for console and Telnet connections and how to verify the configuration: Console> (enable) set authentication login tacacs enable tacacs login authentication set to enable for console and telnet session.10 Console> (enable) Status ------primary Enabling TACACS+ Authentication Note Specify at least one TACACS+ server before enabling TACACS+ authentication on the switch.----------------tacacs disabled radius disabled local enabled(primary) Tacacs key: Tacacs login attempts: 3 Tacacs timeout: 5 seconds Tacacs direct request: disabled Tacacs-Server ---------------------------------------172. If you are using both RADIUS and TACACS+.Chapter 21 Configuring Authentication Configuring Switch Access Using AAA Console> (enable) show tacacs Login Authentication: --------------------tacacs radius local Console Session ---------------disabled disabled enabled(primary) Telnet Session ---------------disabled disabled enabled(primary) Telnet Session ---------------disabled disabled enabled(primary) Enable Authentication: Console Session ---------------------. Enter the console or telnet keyword if you console | http | telnet] [primary] want to enable TACACS+ only for console port or Telnet connection attempts. perform this task in privileged mode: Task Command Step 1 Enable TACACS+ authentication for normal login set authentication login tacacs enable [all | mode.3 172.4 21-18 78-13315-02 .52.2 172. For information on specifying a TACACS+ server. If desired.20. see the “Specifying TACACS+ Servers” section on page 21-xvii. you can use the console and telnet keywords to specify that TACACS+ authentication be used only on console or Telnet connections. Enter the console or telnet keyword if you console | http | telnet] [primary] want to enable TACACS+ only for console port or Telnet connection attempts. Verify the TACACS+ configuration.20.52.3 and 6.

To specify the TACACS+ key.20.3 and 6.52.3 172. Catalyst 6000 Family Software Configuration Guide—Releases 6. perform this task in privileged mode: Task Command set tacacs key key show tacacs Step 1 Step 2 Specify the key used to encrypt packets. The default timeout is 5 seconds.20.52. Verify the TACACS+ configuration.20. make sure you configure an identical key on the TACACS+ server. Console> (enable) show tacacs Tacacs key: Secret_TACACS_key Tacacs login attempts: 3 Tacacs timeout: 5 seconds Tacacs direct request: disabled Tacacs-Server ---------------------------------------172.Chapter 21 Configuring Switch Access Using AAA Configuring Authentication Console> (enable) set authentication enable tacacs enable tacacs enable authentication set to enable for console and telnet session. This example shows how to specify the TACACS+ key and verify the configuration: Console> (enable) set tacacs key Secret_TACACS_key The tacacs key has been set to Secret_TACACS_key.52.2 172. Console> (enable) show authentication Login Authentication: --------------------tacacs radius local Enable Authentication: ---------------------tacacs radius local Console> (enable) Console Session ---------------enabled(primary) disabled enabled Console Session ----------------enabled(primary) disabled enabled Telnet Session ---------------enabled(primary) disabled enabled Telnet Session ---------------enabled(primary) disabled enabled Specifying the TACACS+ Key Note If you configure a TACACS+ key on the client.4 78-13315-02 21-19 .10 Console> (enable) Status ------primary Specifying the TACACS+ Timeout Interval You can specify the timeout interval between retransmissions to the TACACS+ server.

To specify the number of login attempts allowed.20.Chapter 21 Configuring Authentication Configuring Switch Access Using AAA To specify the TACACS+ timeout interval.2 172.10 Console> (enable) Status ------primary Specifying the TACACS+ Login Attempts You can specify the number of failed login attempts allowed.3 172.20.3 172.4 21-20 78-13315-02 .10 Console> (enable) Status ------primary Catalyst 6000 Family Software Configuration Guide—Releases 6. This example shows how to specify the number of login attempts and verify the configuration: Console> (enable) set tacacs attempts 5 Tacacs number of attempts set to 5.52.20. perform this task in privileged mode: Task Step 1 Step 2 Command set tacacs timeout seconds show tacacs Specify the TACACS+ timeout interval.52.52.52.20.52. Verify the TACACS+ configuration. Console> (enable) show tacacs Tacacs key: Secret_TACACS_key Tacacs login attempts: 5 Tacacs timeout: 30 seconds Tacacs direct request: disabled Tacacs-Server ---------------------------------------172.2 172.20. This example shows how to specify the server timeout interval and verify the configuration: Console> (enable) set tacacs timeout 30 Tacacs timeout set to 30 seconds.20.3 and 6. Verify the TACACS+ configuration. Console> (enable) show tacacs Tacacs key: Secret_TACACS_key Tacacs login attempts: 3 Tacacs timeout: 30 seconds Tacacs direct request: disabled Tacacs-Server ---------------------------------------172. perform this task in privileged mode: Task Step 1 Step 2 Command set tacacs attempts number show tacacs Specify the number of allowed login attempts.52.

4 78-13315-02 21-21 . you can optionally specify the host name of a configured TACACS+ server to direct the TACACS+ authentication request to that particular TACACS+ server.2 172. This example shows how to enable TACACS+ directed request and verify the configuration: Console> (enable) set tacacs directedrequest enable Tacacs direct request has been enabled.3 172. Authentication will fail if the server that the switch contacts does not have an account for the user that is attempting to log in.52. Console> (enable) show tacacs Tacacs key: Secret_TACACS_key Tacacs login attempts: 5 Tacacs timeout: 30 seconds Tacacs direct request: enabled Tacacs-Server ---------------------------------------172.10 Console> (enable) Status ------primary Disabling TACACS+ Directed Request To disable TACACS+ directed request. Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. To enable TACACS+ directed request.3 and 6. This example shows how to disable TACACS+ directed request: Console> (enable) set tacacs directedrequest disable Tacacs direct request has been disabled. set tacacs directedrequest disable Verify the TACACS+ configuration.20.52.20.52.Chapter 21 Configuring Switch Access Using AAA Configuring Authentication Enabling TACACS+ Directed Request When you enable TACACS+ directed request. perform this task in privileged mode: Task Step 1 Step 2 Command show tacacs Disable TACACS+ directed request on the switch. perform this task in privileged mode: Task Step 1 Step 2 Command show tacacs Enable TACACS+ directed request on the switch. set tacacs directedrequest enable Verify the TACACS+ configuration.20.

perform this task in privileged mode: Task Step 1 Step 2 Command clear tacacs key show tacacs Clear the TACACS+ key. Verify the TACACS+ configuration.52.3 cleared from TACACS table Console> (enable) This example shows how to clear all TACACS+ servers from the configuration: Console> (enable) clear tacacs server all All TACACS servers cleared Console> (enable) Clearing the TACACS+ Key To clear the TACACS+ key.3 172. Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. This example shows how to clear the TACACS+ key: Console> (enable) clear tacacs key TACACS server key cleared. show tacacs Step 2 This example shows how to clear a specific TACACS+ server from the configuration: Console> (enable) clear tacacs server 172. Enter the all keyword to clear all of the servers from the configuration.20. Verify the TACACS+ server configuration.20.Chapter 21 Configuring Authentication Configuring Switch Access Using AAA Clearing TACACS+ Servers To clear one or more TACACS+ servers. perform this task in privileged mode: Task Step 1 Command Specify the IP address of the TACACS+ server to clear tacacs server [ip_addr | all] clear from the configuration.4 21-22 78-13315-02 .52.3 and 6.

Enter the console or telnet keyword if you console | http | telnet] want to disable TACACS+ only for console port or Telnet connection attempts. page 21-xxiv Specifying the RADIUS Key. page 21-xxvii Specifying the RADIUS Deadtime. Enter the console or telnet keyword console | http | telnet] if you want to disable TACACS+ only for console port or Telnet connection attempts.3 and 6.Chapter 21 Configuring Switch Access Using AAA Configuring Authentication Disabling TACACS+ Authentication When local authentication is disabled and only TACACS+ authentication is enabled.4 78-13315-02 21-23 . page 21-xxviii Clearing RADIUS Servers. local authentication is reenabled automatically. Console> (enable) show authentication Login Authentication: --------------------tacacs radius local Enable Authentication: ---------------------tacacs radius local Console> (enable) Console Session ---------------disabled disabled enabled(primary) Console Session ----------------disabled disabled enabled(primary) Telnet Session ---------------disabled disabled enabled(primary) Telnet Session ---------------disabled disabled enabled(primary) Configuring RADIUS Authentication These sections describe how to configure RADIUS authentication on the switch: • • • • • • • Specifying RADIUS Servers. page 21-xxiv Enabling RADIUS Authentication. Console> (enable) set authentication enable tacacs disable tacacs enable authentication set to disable for console and telnet session. if you disable TACACS+ authentication. perform this task in privileged mode: Task Step 1 Command set authentication login tacacs disable [all | Disable TACACS+ authentication for normal login mode. page 21-xxix Catalyst 6000 Family Software Configuration Guide—Releases 6. page 21-xxv Specifying the RADIUS Timeout Interval. Verify the TACACS+ configuration. set authentication enable tacacs disable [all | Disable TACACS+ authentication for enable mode. page 21-xxvii Specifying the RADIUS Retransmit Count. show authentication Step 2 Step 3 This example shows how to disable TACACS+ authentication for console and Telnet connections and how to verify the configuration: Console> (enable) set authentication login tacacs disable tacacs login authentication set to disable for console and telnet session. To disable TACACS+ authentication.

52. page 21-xxix Disabling RADIUS Authentication. make sure you specify an identical key on the RADIUS server. The RADIUS key is used to encrypt and authenticate all communication between the RADIUS client and server.52. perform this task in privileged mode: Task Step 1 Command set radius server ip_addr [auth-port port] [primary] Specify the IP address of up to three RADIUS servers. The length of the key is limited to 65 characters. Catalyst 6000 Family Software Configuration Guide—Releases 6. page 21-xxx Specifying RADIUS Servers To specify one or more RADIUS servers.3 172. It can include any printable ASCII characters except tabs. Specify the primary server using the primary keyword. You must configure the same key on the client and the RADIUS server. Console> (enable) show radius Login Authentication: --------------------tacacs radius local Enable Authentication: ---------------------tacacs radius local Radius Radius Radius Radius Deadtime: Key: Retransmit: Timeout: Console Session ---------------disabled disabled enabled(primary) Console Session ----------------disabled disabled enabled(primary) 0 minutes 2 5 seconds Auth-port -----------1812 Telnet Session ---------------disabled disabled enabled(primary) Telnet Session ---------------disabled disabled enabled(primary) Radius-Server Status ----------------------------.3 primary Console> (enable) Specifying the RADIUS Key Note If you specify a RADIUS key on the client.Chapter 21 Configuring Authentication Configuring Switch Access Using AAA • • Clearing the RADIUS Key.20. Verify the RADIUS server configuration. specify the destination UDP port to use on the server. Step 2 show radius This example shows how to specify a RADIUS server and verify the configuration: Console> (enable) set radius server 172.------172.3 and 6.20.52. Optionally.4 21-24 78-13315-02 .3 with auth-port 1812 added to radius server table as primary server.20.

---------------tacacs disabled disabled radius enabled(primary) enabled(primary) local enabled enabled Enable Authentication: ---------------------tacacs radius local Radius Radius Radius Radius Deadtime: Key: Retransmit: Timeout: Console Session ----------------disabled enabled(primary) enabled Telnet Session ---------------disabled enabled(primary) enabled 0 minutes Secret_RADIUS_key 2 5 seconds Auth-port -----------1812 Radius-Server Status ----------------------------.3 primary Console> (enable) Enabling RADIUS Authentication Note Specify at least one RADIUS server before enabling RADIUS authentication on the switch.20. the RADIUS key value is hidden): Console> (enable) set radius key Secret_RADIUS_key Radius key set to Secret_RADIUS_key Console> (enable) show radius Login Authentication: Console Session Telnet Session --------------------. For information on specifying a RADIUS server. perform this task in privileged mode: Task Step 1 Step 2 Command Specify the RADIUS key used to encrypt packets set radius key key sent to the RADIUS server.4 78-13315-02 21-25 . If desired. Verify the RADIUS configuration. see the “Specifying RADIUS Servers” section on page 21-xxiv. You can enable RADIUS authentication for login and enable access to the switch.---------------.Chapter 21 Configuring Switch Access Using AAA Configuring Authentication To specify the RADIUS key. you can use the primary keyword to force the switch to try RADIUS authentication first. If you are using both RADIUS and TACACS+.52. show radius This example shows how to specify the RADIUS key and verify the configuration (in normal mode.------172. you can enter the console or telnet keyword to specify that RADIUS authentication be used only on console or Telnet connections.3 and 6. Catalyst 6000 Family Software Configuration Guide—Releases 6.

Console> (enable) set authentication enable radius enable radius enable authentication set to enable for console and telnet session. you can set the service-type attribute (attribute 6) to Administrative (value 6) for a RADUIS user to directly launch the user into enable mode without asking for a separate enable password. and assign a password to that user. you will need to create a user $enab15$ on the RADIUS server. Enter the console or telnet keyword if you console | http | telnet] [primary] want to enable RADIUS only for console port or Telnet connection attempts. and assign a password to that user.3 and 6. Console> (enable) show authentication Login Authentication: --------------------tacacs radius local Enable Authentication: ---------------------tacacs radius local Console> (enable) Console Session ---------------disabled enabled(primary) enabled Console Session ----------------disabled enabled(primary) enabled Telnet Session ---------------disabled enabled(primary) enabled Telnet Session ---------------disabled enabled(primary) enabled Catalyst 6000 Family Software Configuration Guide—Releases 6.) After you log in to the Catalyst 6000 family switch with your assigned username and password (john/hello). This example shows how to enable RADIUS authentication and verify the configuration: Console> (enable) set authentication login radius enable radius login authentication set to enable for console and telnet session. If your RADIUS server does not support the $enab15$ username. Enable RADIUS authentication for enable mode. set authentication enable radius enable [all | Enter the console or telnet keyword if you want to console | http | telnet] [primary] enable RADIUS only for console port or Telnet connection attempts. password hello. show authentication Step 2 Step 3 Step 4 Note To use RADIUS authentication for enable mode.Chapter 21 Configuring Authentication Configuring Switch Access Using AAA To set up the RADIUS username and enable RADIUS authentication. Verify the RADIUS configuration. perform this task in privileged mode: Step 1 Enable RADIUS authentication for normal login set authentication login radius enable [all | mode. Create a user $enab15$ on the RADIUS server. This user needs to be created in addition to your assigned username and password on the RADIUS server (example: username john. See the Note below for additional information.4 21-26 78-13315-02 . you can enter enable mode using the password assigned to the $enab15$ user.

each RADIUS server will be tried two times. This example shows how to specify the RADIUS timeout interval and verify the configuration: Console> (enable) set radius timeout 10 Radius timeout set to 10 seconds. This example shows how to specify the RADIUS retransmit count and verify the configuration: Console> (enable) set radius retransmit 4 Radius retransmit count set to 4.4 78-13315-02 21-27 . Console> (enable) show radius Login Authentication: --------------------tacacs radius local Enable Authentication: ---------------------tacacs radius local Radius Radius Radius Radius Deadtime: Key: Retransmit: Timeout: Console Session ---------------disabled enabled(primary) enabled Console Session ----------------disabled enabled(primary) enabled Telnet Session ---------------disabled enabled(primary) enabled Telnet Session ---------------disabled enabled(primary) enabled 0 minutes Secret_RADIUS_key 2 10 seconds Auth-port -----------1812 Radius-Server Status ----------------------------. To specify the RADIUS timeout interval. The default timeout is 5 seconds. perform this task in privileged mode: Task Step 1 Step 2 Command set radius timeout seconds show radius Specify the RADIUS timeout interval.3 and 6. Console> (enable) show radius Catalyst 6000 Family Software Configuration Guide—Releases 6. To specify the RADIUS retransmit count.20.52.Chapter 21 Configuring Switch Access Using AAA Configuring Authentication Specifying the RADIUS Timeout Interval You can specify the timeout interval between retransmissions to the RADIUS server.3 primary Console> (enable) Specifying the RADIUS Retransmit Count You can specify the number of times the switch will attempt to contact a RADIUS server before the next configured server is tried. perform this task in privileged mode: Task Step 1 Step 2 Command set radius retransmit count show radius Specify the RADIUS server retransmit count. By default.------172. Verify the RADIUS configuration. Verify the RADIUS configuration.

This example shows how to specify the RADIUS deadtime interval and verify the configuration: Console> (enable) set radius deadtime 5 Radius deadtime set to 5 minute(s) Console> (enable) show radius Login Authentication: --------------------tacacs radius local Enable Authentication: ---------------------tacacs radius local Console Session ---------------disabled enabled(primary) enabled Console Session ----------------disabled enabled(primary) enabled Telnet Session ---------------disabled enabled(primary) enabled Telnet Session ---------------disabled enabled(primary) enabled Catalyst 6000 Family Software Configuration Guide—Releases 6. Any authentication requests received during the deadtime interval (such as other users attempting to log in to the switch) are not sent to a RADIUS server marked dead. To set the RADIUS deadtime. Configuring a deadtime speeds up the authentication process by eliminating timeouts and retransmissions to the dead RADIUS server. the deadtime is ignored because there are no alternate servers available. or if all of the configured servers are marked dead. Verify the RADIUS configuration.Chapter 21 Configuring Authentication Configuring Switch Access Using AAA Login Authentication: --------------------tacacs radius local Enable Authentication: ---------------------tacacs radius local Radius Radius Radius Radius Deadtime: Key: Retransmit: Timeout: Console Session ---------------disabled enabled(primary) enabled Console Session ----------------disabled enabled(primary) enabled Telnet Session ---------------disabled enabled(primary) enabled Telnet Session ---------------disabled enabled(primary) enabled 0 minutes Secret_RADIUS_key 4 10 seconds Auth-port -----------1812 Radius-Server Status ----------------------------.4 21-28 78-13315-02 .20. the switch marks that server as dead for the length of time specified by the deadtime.3 and 6. when a RADIUS server does not respond to an authentication request.------172.3 primary Console> (enable) Specifying the RADIUS Deadtime You can configure the switch so that. If you configure only one RADIUS server. perform this task in privileged mode: Task Step 1 Step 2 Command set radius deadtime minutes show radius Specify the RADIUS server deadtime interval.52.

2 Console> (enable) Clearing RADIUS Servers To clear one or more RADIUS servers.52.20.20.4 78-13315-02 21-29 .20. perform this task in privileged mode: Task Step 1 Command clear radius server [ip_addr | all] Specify the IP address of the RADIUS server to clear from the configuration.3 and 6.52.52. perform this task in privileged mode: Task Step 1 Step 2 Command clear radius key show radius Clear the RADIUS key.20. Verify the RADIUS server configuration.3 cleared from radius server table. This example shows how to clear the RADIUS key and verify the configuration: Console> (enable) clear radius key Radius key cleared.------172.3 primary 172. Verify the RADIUS configuration. Console> (enable) show radius Login Authentication: --------------------tacacs radius local Console Session ---------------disabled disabled enabled(primary) Telnet Session ---------------disabled disabled enabled(primary) Catalyst 6000 Family Software Configuration Guide—Releases 6.3 172. Console> (enable) This example shows how to clear all RADIUS servers from the configuration: Console> (enable) clear radius server all All radius servers cleared from radius server table.52. Console> (enable) Clearing the RADIUS Key To clear the RADIUS key. Step 2 show radius This example shows how to clear a single RADIUS server from the configuration: Console> (enable) clear radius server 172. Enter the all keyword to clear all of the servers from the configuration.Chapter 21 Configuring Switch Access Using AAA Configuring Authentication Radius Radius Radius Radius Deadtime: Key: Retransmit: Timeout: 5 minutes Secret_RADIUS_key 4 10 seconds Auth-port -----------1812 1812 Radius-Server Status ----------------------------.

52.20. local authentication is reenabled automatically. show authentication This example shows how to disable RADIUS authentication: Console> (enable) set authentication login radius disable radius login authentication set to disable for console and telnet session. To disable RADIUS authentication.3 primary Console> (enable) Auth-port -----------1812 Disabling RADIUS Authentication When local authentication is disabled and only RADIUS authentication is enabled.3 and 6.Chapter 21 Configuring Authentication Configuring Switch Access Using AAA Enable Authentication: ---------------------tacacs radius local Radius Radius Radius Radius Deadtime: Key: Retransmit: Timeout: Console Session ----------------disabled disabled enabled(primary) 0 minutes 2 5 seconds Telnet Session ---------------disabled disabled enabled(primary) Radius-Server Status ----------------------------. if you disable RADIUS authentication. perform this task in privileged mode: Task Step 1 Step 2 Step 3 Command set authentication login radius disable [all | console | http | telnet] Disable RADIUS authentication for login mode. set authentication enable radius disable [all | console | http | telnet] Verify the RADIUS configuration. Console> (enable) set authentication enable radius disable radius enable authentication set to disable for console and telnet session.4 21-30 78-13315-02 . Console> (enable) show authentication Login Authentication: --------------------tacacs radius local Enable Authentication: ---------------------tacacs radius local Console> (enable) Console Session ---------------disabled disabled enabled(primary) Console Session ----------------disabled disabled enabled(primary) Telnet Session ---------------disabled disabled enabled(primary) Telnet Session ---------------disabled disabled enabled(primary) Catalyst 6000 Family Software Configuration Guide—Releases 6.------172. Disable RADIUS authentication for enable mode.

page 21-xxxix Configuring a Kerberos Server Before you can use Kerberos as an authentication method on the switch.cisco.3 and 6. you need to configure the Kerberos server. You will need to create a database for the KDC and add the switch to the database. page 21-xxxvii Defining and Clearing a Private DES Key. Catalyst 6000 Family Software Configuration Guide—Releases 6. page 21-xxxiii Specifying a Kerberos Server. page 21-xxxv Enabling Credentials Forwarding. perform this procedure: Step 1 Before you can enter the switch in the Kerberos server’s key table.EDU Step 6 Move the keytab file to a place where the switch can reach it.EDU Step 4 Add the administrative principals as follows: ank user1/admin@CISCO.EDU database: ank host/Cat6509.EDU is created: /usr/local/sbin/kdb5_util create -r CISCO. The following example adds a switch called Cat6509 to the CISCO.edu@CISCO.local ktadd command. Note Kerberos authentication requires that NTP is enabled. page 21-xxxi Enabling Kerberos. page 21-xxxviii Displaying and Clearing Kerberos Configurations. page 21-xxxviii Encrypting a Telnet Session.edu@CISCO. • • • • • • • • • • • • Configuring a Kerberos Server.EDU -s Step 2 Add the switch to the database.EDU Step 5 Using the admin. page 21-xxxvi Disabling Credentials Forwarding. page 21-xxxiv Copying SRVTAB Files. we recommend that you enable DNS. create the database entry for the switch as follows: ktadd host/Cat6509. you must create the database the KDC will use.cisco. page 21-xxxiv Deleting an SRVTAB Entry.4 78-13315-02 21-31 . In the following example.Chapter 21 Configuring Switch Access Using AAA Configuring Authentication Configuring Kerberos Authentication These sections describe how to configure Kerberos authentication on the switch. Additionally.EDU Step 3 Add the username as follows: ank user1@CISCO. page 21-xxxiii Mapping a Kerberos Realm to a Host Name or DNS Domain. a database called CISCO. page 21-xxxii Defining the Kerberos Local Realm. To configure the Kerberos server.

This example shows how to enable Kerberos as the login authentication method for Telnet and verify the configuration: kerberos> (enable) set authentication login kerberos enable telnet kerberos login authentication set to enable for telnet session.----------------.---------------.---------------tacacs disabled disabled radius disabled disabled kerberos disabled enabled(primary) local enabled(primary) enabled kerberos> (enable) This example shows how to enable Kerberos as the login authentication method for the console and verify the configuration: kerberos> (enable) set authentication login kerberos enable console kerberos login authentication set to enable for console session. kerberos> (enable) show authentication Login Authentication: Console Session Telnet Session --------------------.---------------tacacs disabled disabled radius disabled disabled kerberos enabled(primary) enabled(primary) local enabled enabled kerberos> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.---------------tacacs disabled disabled radius disabled disabled kerberos disabled enabled(primary) local enabled(primary) enabled Enable Authentication:Console Session Telnet Session ---------------------.Chapter 21 Configuring Authentication Configuring Switch Access Using AAA Step 7 Start the KDC server as follows: /usr/local/sbin/krb5kdc /usr/local/sbin/kadmind Enabling Kerberos To enable Kerberos authentication.---------------. perform this task in privileged mode: Task Step 1 Step 2 Command set authentication login kerberos enable [all | console | http | telnet] [primary] show authentication Specify Kerberos as the authentication method. Verify the configuration.3 and 6.---------------tacacs disabled disabled radius disabled disabled kerberos enabled(primary) enabled(primary) local enabled enabled Enable Authentication:Console Session Telnet Session ---------------------.4 21-32 78-13315-02 . kerberos> (enable) show authentication Login Authentication: Console Session Telnet Session --------------------.----------------.

cisco. To specify the Kerberos server. (The default port number is 750.2.0=0=0 kerberos> (enable) Specifying a Kerberos Server You can specify to the switch which KDC to use in a specific Kerberos realm.) Clear the Kerberos server entry. Server:187. perform this task in privileged mode: Task Define the default realm for the switch.COM Kerberos server entries: Realm:CISCO. The Kerberos server information you enter is maintained in a table with one entry for each Kerberos realm. Optionally.8>00>50. Command set kerberos local-realm kerberos_realm Note Make sure the realm is entered in uppercase letters.Chapter 21 Configuring Switch Access Using AAA Configuring Authentication Defining the Kerberos Local Realm The Kerberos realm is a domain consisting of users.COM. Optionally.com@CISCO.COM.. perform this task in privileged mode: Task Step 1 Command Specify which KDC to use in a given Kerberos set kerberos server kerberos_realm {hostname | realm. and network services that are registered to a Kerberos server. Kerberos will not authenticate users if the realm is entered in lowercase letters.COM Kerberos local realm for this switch set to CISCO.COM Kerberos Clients NOT Mandatory Kerberos Credentials Forwarding Enabled Kerberos Pre Authentication Method set to None Kerberos config key: Kerberos SRVTAB Entries Srvtab Entry 1:host/niners. hosts.com. clear kerberos server kerberos_realm {hostname | ip_address} [port] Step 2 Catalyst 6000 Family Software Configuration Guide—Releases 6. Realm:CISCO.COM 0 932423923 1 1 8 01.4 78-13315-02 21-33 . This example shows how to define a local realm and how to verify the configuration: kerberos> (enable) set kerberos local-realm CISCO. the switch must know the host name or IP address of the host running the KDC and the name of the Kerberos realm. enter the port number the KDC ip_address} [port] is monitoring. Port:750 Kerberos Domain<->Realm entries: Domain:cisco.3 and 6. To authenticate a user defined in the Kerberos database. To configure the switch to authenticate to the KDC in a specified Kerberos realm.0.1. kerberos> (enable) show kerberos Kerberos Local Realm:CISCO. The maximum number of entries in the table is 100. you can also specify the port number which the KDC is monitoring.

1 750 Kerberos Realm-Server-Port entry set to:CISCO.1-750 deleted Console> (enable) Mapping a Kerberos Realm to a Host Name or DNS Domain Optionally.COM-187.1 .COM Kerberos DnsDomain-Realm entry set to CISCO . If you enter the SRVTAB directly into the switch. The most secure method to copy SRVTAB files to the hosts in your Kerberos realm is to copy them onto physical media and go to each host in turn and manually copy the files onto the system.COM Console> (enable) Console> (enable) clear kerberos realm CISCO CISCO.2.750 kerberos> (enable) Console> (enable) clear kerberos server CISCO.COM 187.CISCO. the switch must share a key with the KDC.0.COM Kerberos DnsDomain-Realm entry CISCO .1 750 Kerberos Realm-Server-Port entry CISCO.4 21-34 78-13315-02 .0. you must transfer them through the network by using the Trivial File Transfer Protocol (TFTP).2.Chapter 21 Configuring Authentication Configuring Switch Access Using AAA This example shows how to specify which Kerberos server will serve as the KDC for the specified Kerberos realm and how to clear the entry: kerberos> (enable) set kerberos server CISCO.3 and 6. To allow this configuration. you can map a host name or domain name system (DNS) domain to a Kerberos realm.COM 187. When you copy the SRVTAB file from the switch to the KDC. These files are called SRVTAB files on the switch and KEYTAB files on the servers.187. you must give the switch a copy of the file stored in the KDC that contains the key. To copy SRVTAB files to a switch that does not have a physical media drive.2. Catalyst 6000 Family Software Configuration Guide—Releases 6.COM .COM deleted Console> (enable) Copying SRVTAB Files To make it possible for remote users to authenticate to the switch using Kerberos credentials. The maximum size of the table is 20 entries. The entries are maintained in the SRVTAB table.2.0. kerberos_realm This example shows how to map a Kerberos realm to a DNS domain and how to clear the entry: Console> (enable) set kerberos realm CISCO CISCO. kerberos_realm Clear the Kerberos realm domain or host mapping clear kerberos realm {dns_domain | host} entry. perform this task in privileged mode: Task Step 1 Step 2 Command (Optional) Map a host name or DNS domain to a set kerberos realm {dns_domain | host} Kerberos realm.CISCO. the switch parses the information in this file and stores it in the running configuration in the Kerberos SRVTAB entry format. To map a Kerberos realm to either a host name or DNS domain.0. create an entry for each Kerberos principal (service) on the switch.

0=0=0 Srvtab Entry 2:host/niners. Command clear kerberos srvtab entry kerberos_principal principal_type Catalyst 6000 Family Software Configuration Guide—Releases 6. set kerberos srvtab entry kerberos_principal principal_type timestamp key_version number key_type key_length encrypted_keytab This example shows how to retrieve an SRVTAB file from the KDC. Server:187.cisco. Port:750 Kerberos Domain<->Realm entries: Domain:cisco..cisco. enter an SRVTAB directly into the switch.5>00>50.4 78-13315-02 21-35 .com@CISCO.com@CISCO.20.com@CISCO.10 /users/jdoe/krb5/ninerskeytab kerberos> (enable) kerberos> (enable) set kerberos srvtab entry host/niners.20. Port:750 Realm:CISCO.2.5>00>50.3 and 6. and verify the configuration: kerberos> (enable) set kerberos srvtab remote 187.COM. perform this task in privileged mode: Task Step 1 Step 2 Command Retrieve a specified SRVTAB file from the KDC.COM 0 932423923 1 1 8 03.com.COM.COM 0 932423923 1 1 8 03.COM Principal Type:0 Timestamp:932423923 Key version number:1 Key type:1 Key length:8 Encrypted key tab:03. Realm:CISCO.0.2. set kerberos srvtab remote {hostname | ip_address} filename (Optional) Enter the SRVTAB directly into the switch.1.cisco..0=0=0 kerberos> (enable) show kerberos Kerberos Local Realm:CISCO.COM Kerberos server entries: Realm:CISCO..1.edu@CISCO.32.cisco.5>00>50. Server:187.9 Console> (enable) Deleting an SRVTAB Entry To delete an SRVTAB entry.COM Kerberos Clients NOT Mandatory Kerberos Credentials Forwarding Enabled Kerberos Pre Authentication Method set to None Kerberos config key: Kerberos SRVTAB Entries Srvtab Entry 1:host/niners.0=0=0 Kerberos SRVTAB entry set to Principal:host/niners.Chapter 21 Configuring Switch Access Using AAA Configuring Authentication To remotely copy SRVTAB files to the switch from the KDC.EDU 0 933974942 1 1 8 00?58:127:223=:. perform this task in privileged mode: Task Delete the SRVTAB entry for a particular Kerberos principal.

To enable credentials forwarding.9 kerberos> (enable) This example shows how to configure the switch so that Kerberos clients are mandatory for users to authenticate to other network services: Console> (enable) set kerberos clients mandatory Kerberos clients set to mandatory Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6. (Optional) Configure Telnet to fail if clients cannot authenticate to the remote server. if forwarding is not enabled and a user tries to list credentials after authenticating to a host.4 21-36 78-13315-02 .cisco.2.COM Kerberos Clients NOT Mandatory Kerberos Credentials Forwarding Enabled Kerberos Pre Authentication Method set to None Kerberos config key: Kerberos SRVTAB Entries Srvtab Entry 1:host/aspen-niners.Chapter 21 Configuring Authentication Configuring Switch Access Using AAA This example shows how to delete an SRVTAB entry: kerberos> (enable) clear kerberos srvtab entry host/niners.1.EDU 0 933974942 1 1 8 00?91:107:423=:.COM 0 kerberos> (enable) Enabling Credentials Forwarding A user authenticated to a Kerberized switch has a TGT and can use it to authenticate to a host on the network. Server:187.0.COM.20.com@CISCO.com.edu@CISCO. To configure clients to forward user credentials as they connect to other hosts in the Kerberos realm. However. the application attempts to authenticate users using the default method of authentication for that network service. Port:750 Kerberos Domain<->Realm entries: Domain:cisco. configure the switch to forward user TGTs when they authenticate from the switch to Kerberized remote hosts on the network using Kerberized Telnet. Port:750 Realm:CISCO. Server:187.COM Kerberos server entries: Realm:CISCO. If you do not make Kerberos authentication mandatory and Kerberos authentication fails. For example.1. Realm:CISCO. the output will show no Kerberos credentials present. these users can authenticate only to other services on the network with Kerberized clients. As an additional layer of security. perform this task in privileged mode: Task Step 1 Step 2 Command set kerberos credentials forward set kerberos clients mandatory Set all clients to forward user credentials upon successful Kerberos authentication. you can configure the switch so that after users authenticate to it. Telnet prompts for a password.2.cisco. This example shows how to configure clients to forward user credentials and verify the configuration: kerberos> (enable) set kerberos credentials forward Kerberos credentials forwarding enabled kerberos> (enable) show kerberos Kerberos Local Realm:CISCO.COM.3 and 6.

perform this task in privileged mode: Task Clear the Kerberos clients mandatory configuration.3 and 6.4 78-13315-02 21-37 . perform this task in privileged mode: Task Clear the credentials forwarding configuration. Command clear kerberos clients mandatory This example shows how to clear the clients mandatory configuration and verify the change: Console> Kerberos Console> Kerberos Kerberos (enable) clear kerberos clients mandatory clients mandatory cleared (enable) show kerberos Local Realm not configured server entries: Kerberos Domain<->Realm entries: Kerberos Kerberos Kerberos Kerberos Kerberos Console> Kerberos Clients NOT Mandatory Credentials Forwarding Disabled Pre Authentication Method set to None config key: SRVTAB Entries (enable) server entries: Kerberos Domain<->Realm entries: Kerberos Kerberos Kerberos Kerberos Kerberos Console> Clients Mandatory Credentials Forwarding Disabled Pre Authentication Method set to Encrypted Unix Time Stamp config key: SRVTAB Entries (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.Chapter 21 Configuring Switch Access Using AAA Configuring Authentication Disabling Credentials Forwarding To clear the credentials forwarding configuration. Command clear kerberos credentials forward This example shows how to clear the credentials forwarding configuration and verify the change: Console> Kerberos Console> Kerberos Kerberos (enable) clear kerberos credentials forward credentials forwarding disabled (enable) show kerberos Local Realm not configured server entries: Kerberos Domain<->Realm entries: Kerberos Kerberos Kerberos Kerberos Kerberos Console> Clients NOT Mandatory Credentials Forwarding Disabled Pre Authentication Method set to None config key: SRVTAB Entries (enable) To clear the Kerberos clients mandatory configuration.

edu@CISCO.COM. select the encrypt kerberos option in the telnet command. Realm:CISCO. If the Telnet server uses Kerberos for authentication.com. Catalyst 6000 Family Software Configuration Guide—Releases 6.2.EDU 0 933974942 1 1 8 12151><88?=>>3>11 kerberos> (enable) To clear the DES key.20. you can choose to have all the application data packets encrypted for the duration of the Telnet session. perform this task in privileged mode: Task Define a DES key for the switch.cisco. The private DES key can be used to encrypt the secret key that the switch shares with the KDC so that when the show kerberos command is executed. the secret key is not displayed in clear text.20.Chapter 21 Configuring Authentication Configuring Switch Access Using AAA Defining and Clearing a Private DES Key You can define a private DES key for the switch. whether or not this will be a Kerberized Telnet depends on the authentication method that the Telnet server uses. Server:170. To encrypt the Telnet session.2.1.3 and 6.COM Kerberos Clients Mandatory Kerberos Credentials Forwarding Disabled Kerberos Pre Authentication Method set to Encrypted Unix Time Stamp Kerberos config key:abcd Kerberos SRVTAB Entries Srvtab Entry 1:host/aspen-niners. This example shows how to clear the DES key: Console> (enable) clear key config-key Kerberos config key cleared Console> (enable) Command clear key config-key string Encrypting a Telnet Session After a user authenticates to the switch using Kerberos and wants to Telnet to another switch or host. Port:750 Kerberos Domain<->Realm entries: Domain:cisco. To define a DES key.COM.COM Kerberos server entries: Realm:CISCO. The key length should be eight characters or less.4 21-38 78-13315-02 . Port:750 Realm:CISCO. perform this task in privileged mode: Task Clear a DES key from the switch. Server:172.1. Command set key config-key string This example shows how to define a DES key and verify the configuration: kerberos> (enable) set key config-key abcd Kerberos config key set to abcd kerberos> (enable) show kerberos Kerberos Local Realm:CISCO.

cisco.9 kerberos> (enable) To display the Kerberos credentials. Command show kerberos This example shows how to display the Kerberos configuration: kerberos> (enable) show kerberos Kerberos Local Realm:CISCO.2.2. Command telnet encrypt kerberos host This example shows how to configure a Telnet session for Kerberos authentication and encryption: Console> (enable) telnet encrypt kerberos Displaying and Clearing Kerberos Configurations These commands can be used to display and clear Kerberos configurations on the switch: • • • show kerberos show kerberos creds clear kerberos creds To display the Kerberos configuration.0.3 and 6.COM.COM. perform this task: Task Encrypt a Telnet session.edu@CISCO.20.1..Chapter 21 Configuring Switch Access Using AAA Configuring Authentication To encrypt a Telnet session.EDU 0 933974942 1 1 8 00?58:127:223=:. Command show kerberos creds This example shows how to display the Kerberos credentials: Console> (enable) show kerberos creds No Kerberos credentials. Server:187. Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.COM Kerberos server entries: Realm:CISCO. Server:187.com.4 78-13315-02 21-39 . Realm:CISCO.cisco.COM 0 932423923 1 1 8 03.COM Kerberos Clients NOT Mandatory Kerberos Credentials Forwarding Enabled Kerberos Pre Authentication Method set to None Kerberos config key: Kerberos SRVTAB Entries Srvtab Entry 1:host/niners. Port:750 Realm:CISCO.1. Port:750 Kerberos Domain<->Realm entries: Domain:cisco. perform this task in privileged mode: Task Display the Kerberos credentials.com@CISCO.5>00>50.0=0=0 Srvtab Entry 2:host/niners. perform this task in privileged mode: Task Display the Kerberos configuration.

page 21-xlii Manually Reauthenticating the Supplicant.1x Authentication for Individual Ports” section on page 21-xli. page 21-xliii Enabling Multiple Hosts. page 21-xliv Setting theBack-End Authenticator-to-Authentication-Server Retransmission Time for Transport Layer Packets.1x authentication on the switch: • • • • • • • • • • • • • • • Enabling 802.Chapter 21 Configuring Authentication Configuring Switch Access Using AAA To clear all Kerberos credentials.1x Globally You must enable 802.4 21-40 78-13315-02 .1x Authentication These sections describe how to configure 802.1x Configuration Parameters to the Default Values.1x authentication for the entire system before configuring it for individual ports.1x Globally. To enable 802. page 21-xliii Setting the Quiet Period. page 21-xlvi Setting the Trace Severity.1x Globally. After you globally enable 802. page 21-xl Disabling 802. page 21-xli Enabling and Initializing 802. page 21-xlvi Using the show Commands. page 21-xlv Resetting the 802. Catalyst 6000 Family Software Configuration Guide—Releases 6. page 21-xli Setting and Enabling Automatic Reauthentication of the Supplicant.3 and 6. page 21-xlv Setting the Back-End Authenticator-to-Supplicant Frame-Retransmission Number. see the “Enabling and Initializing 802.1x authentication if they meet the specific requirements required by 802. page 21-xlvii Enabling 802. page 21-xliv Setting the Back-End Authenticator-to-Supplicant Retransmission Time for EAP-Request Frames.1x. you can configure individual ports for 802.1x authentication for individual ports. perform this task in privileged mode: Task Clear all credentials. page 21-xliii Disabling Multiple Hosts. Command clear kerberos creds This example shows how to clear all Kerberos credentials from the switch: Console> (enable) clear kerberos creds Console> (enable) Configuring 802. page 21-xliv Setting the Authenticator-to-Supplicant Retransmission Time for EAP-Request/Identity Frames.1x Authentication for Individual Ports.1x authentication.

1x Authentication for Individual Ports After 802.1x authentication is globally enabled. When 802. see the “Enabling 802.Chapter 21 Configuring Switch Access Using AAA Configuring Authentication To globally enable 802. To enable and initialize 802. even ports that were previously configured for it.1x on the same port.1x control on a specific port. To globally disable 802.1x authentication is enabled for the entire system. Disabling 802.1x authentication is disabled globally. it is no longer available at any port. see the “Specifying RADIUS Servers” section on page 21-xxiv. you must enable and initialize 802.4 78-13315-02 21-41 .1x configuration.1x. Catalyst 6000 Family Software Configuration Guide—Releases 6.1x authentication on the switch.1x authentication. Initialize 802. Note You must specify at least one RADIUS server before you can enable 802. Verify the 802.1x authentication: Console> (enable) set dot1x system-auth-control disable dot1x system-auth-control disabled. perform this task in privileged mode: Task Globally enable 802.1x Globally” section on page 21-xl.3 and 6.1x authentication from the console for individual ports. Command set dot1x system-auth-control enable This example shows how to globally enable 802. Command set dot1x system-auth-control disable This example shows how to globally disable 802.1x authentication.1x authentication.1x.1x authentication: Console> (enable) set dot1x system-auth-control enable dot1x system-auth-control enabled. perform this task in privileged mode: Task Globally disable 802. For information on specifying a RADIUS server. Enabling and Initializing 802.1x Globally When 802. perform this task in privileged mode: Task Command set port dot1x mod/port port-control auto set port dot1x mod/port initialize show port dot1x mod/port Step 1 Step 2 Step 3 Enable 802.1x authentication for access to the switch. To globally enable 802. you can disable it globally.

1x supplicant reauthentication can be enabled for supplicants connected to a specific port.------------..3 and 6. If you do not specify a time period before you enable supplicant reauthentication.1x reauthentication. To manually reauthenticate the supplicant connected to a specific port.4 21-42 78-13315-02 .------------. Spantree port fast start option enabled for port 4/1.----------------4/1 disabled disabled Setting and Enabling Automatic Reauthentication of the Supplicant You can specify how often 802. Enable reauthentication.1x configuration..535 seconds).Chapter 21 Configuring Authentication Configuring Switch Access Using AAA This example shows how to enable 802. Verify the 802.600 seconds (valid values are from 1 to 65. Automatic 802. see the “Manually Reauthenticating the Supplicant” section on page 21-xliii.------------------.1x reauthentication. Trunking disabled for port 4/1 due to Dot1x feature.------------4/1 connecting finished auto unauthorized Port Multiple-Host Re-authentication ----.---------.1x authentication reauthenticates the supplicant and enable automatic 802.---------.1x authentication on port 1 in module 4.------------------.------------4/1 connecting finished auto unauthorized Port Multiple-Host Re-authentication ----. Port 4/1 dot1x initialization complete. Console> (enable) show port dot1x 4/1 Port Auth-State BEnd-State Port-Control Port-Status ----.1x authentication on the same port.1x supplicant reauthentication. perform this task in privileged mode: Task Step 1 Step 2 Step 3 Command set dot1x re-authperiod seconds set port dot1x re-authentication enable show port dot1x mod/port Set the time constant for reauthenticating the supplicant.1x defaults to 3.------------------.------------------.----------------4/1 disabled enabled Catalyst 6000 Family Software Configuration Guide—Releases 6. and verify the configuration: Console> (enable) set dot1x re-authperiod 7200 dot1x re-authperiod set to 7200 seconds Console> (enable) set port dot1x re-authentication enable Port 4/1 re-authentication enabled. Console> (enable) show port dot1x 4/1 Port Auth-State BEnd-State Port-Control Port-Status ----.1x authentication reauthenticates the supplicant if you do so before you enable automatic 802. initialize 802. and verify the configuration: Console> (enable) set port dot1x 4/1 port-control auto Port 4/1 dot1x port-control is set to auto. enable 802. Console> (enable) set port dot1x 4/1 initialize Port 4/1 initializing. 802. This example shows how to set automatic reauthentication to 7200 seconds. To set how often 802.

If you then connect multiple supplicants to that port through a hub.. To enable multiple-user access on a specific port. To manually reauthenticate a supplicant connected to a specific port. To disable multiple-user access on a specific port. and a supplicant connected to that port is authorized successfully.. dot1x re-authentication successful. When a port is enabled for multiple users. perform this task in privileged mode: Task Command Manually reauthenticate the supplicant connected set port dot1x mod/port re-authenticate to a specific port. When you want to configure automatic 802. Disabling Multiple Hosts You can disable multiple-user access on any port where it is enabled. Command set port dot1x mod/port multiple-host enable This example shows how to enable access for multiple hosts on port 1 on module 4: Console> (enable) set port dot1x 4/1 multiple-host enable Port 4/1 multiple hosts allowed. Catalyst 6000 Family Software Configuration Guide—Releases 6. Enabling Multiple Hosts You can enable a specific port to allow multiple-user access. dot1x port 4/1 authorized. This example shows how to manually reauthenticate the supplicant connected to port 1 on module 4: Console> (enable) set port dot1x 4/1 re-authenticate Port 4/1 re-authenticating..Chapter 21 Configuring Switch Access Using AAA Configuring Authentication Manually Reauthenticating the Supplicant You can manually reauthenticate the supplicant connected to a specific port at any time.4 78-13315-02 21-43 . perform this task in privileged mode: Task Disable multiple hosts on a specific port. Command set port dot1x mod/port multiple-host disable This example shows how to disable access for multiple hosts on port 1 on module 4: Console> (enable) set port dot1x 4/1 multiple-host disable Port 4/1 multiple hosts not allowed. see the “Setting and Enabling Automatic Reauthentication of the Supplicant” section on page 21-xlii. you can reduce the security level on that port..1x supplicant reauthentication. perform this task in privileged mode: Task Enable multiple hosts on a specific port.3 and 6. any host (with any MAC address) is allowed to send and receive traffic on that port.

and then tries again. Catalyst 6000 Family Software Configuration Guide—Releases 6. When the back-end authenticator does not receive this notification. To set the value for the quiet period.4 21-44 78-13315-02 . (The default is 30 seconds. Command set dot1x quiet-period seconds This example shows how to set the quiet period to 45 seconds: Console> (enable) set dot1x quiet-period 45 dot1x quiet-period set to 45 seconds. You may set the amount of time that the back-end authenticator waits for notification from 1 to 65535 seconds. the back-end authenticator waits a set period of time. perform this task in privileged mode: Task Set the authenticator-to-supplicant retransmission time for EAP-request/identity frames. Setting the Back-End Authenticator-to-Supplicant Retransmission Time for EAP-Request Frames The supplicant notifies the back-end authenticator that it received the EAP-request frame. and then retransmits the frame.) You may set the value from 0 to 65535 seconds. Setting the Authenticator-to-Supplicant Retransmission Time for EAP-Request/Identity Frames The supplicant notifies the authenticator that it received the EAP-request/identity frame. The idle time is determined by the quiet-period value. it remains idle for set a period of time. When the authenticator does not receive this notification.Chapter 21 Configuring Authentication Configuring Switch Access Using AAA Setting the Quiet Period When the authenticator cannot authenticate the supplicant.3 and 6. Command set dot1x tx-period seconds This example shows how to set the authenticator-to-supplicant retransmission time for the EAP-request/identity frame to 15 seconds: Console> (enable) set dot1x tx-period 15 dot1x tx-period set to 15 seconds.) To set the back-end authenticator-to-supplicant retransmission time for the EAP-request frames. (The default is 60 seconds. the authenticator waits a set period of time. perform this task in privileged mode: Task Command Set the back-end authenticator-to-supplicant set dot1x supp-timeout seconds retransmission time for the EAP-request frame.) To set the authenticator-to-supplicant retransmission time for the EAP-request/identity frames. (The default is 30 seconds. perform this task in privileged mode: Task Set the quiet-period value. You may set the amount of time that the authenticator waits for notification from 1 to 65535 seconds. and then retransmits the frame.

3 and 6. perform this task in privileged mode: Task Set the back-end authenticator-to-supplicant frame retransmission number. To set the number of frames retransmitted from the back-end authenticator to the supplicant. perform this task in privileged mode: Task Set the back-end authenticator-to-authentication-server retransmission time for transport layer packets. the back-end authenticator waits a set period of time. and then retransmits the packet.4 78-13315-02 21-45 . and then retransmits the frames. When the back-end authenticator does not receive this notification after sending the frames.) To set the value for the retransmission of transport layer packets from the back-end authenticator to the authentication server. Setting theBack-End Authenticator-to-Authentication-Server Retransmission Time for Transport Layer Packets The authentication server notifies the back-end authenticator each time it receives a transport layer packet. When the back-end authenticator does not receive a notification after sending a packet. Command set dot1x max-req count This example shows how to set the number of retransmitted frames sent from the back-end authenticator to the supplicant to 4: Console> (enable) set dot1x max-req 4 dot1x max-req set to 4. You may set the number of frames that the back-end authenticator retransmits from 1 to 10 (the default is 2).Chapter 21 Configuring Switch Access Using AAA Configuring Authentication This example shows how to set the back-end authenticator-to-supplicant retransmission time for the EAP-request frame to 15 seconds: Console> (enable) set dot1x supp-timeout 15 dot1x supp-timeout set to 15 seconds. the back-end authenticator waits a set period of time. (The default is 30 seconds. You may set the amount of time that the back-end authenticator waits for notification from 1 to 65535 seconds. Command set dot1x server-timeout seconds This example shows how to set the value for the retransmission time for transport layer packets sent from the back-end authenticator to the authentication server to 15 seconds: Console> (enable) set dot1x server-timeout 15 dot1x server-timeout set to 15 seconds. Setting the Back-End Authenticator-to-Supplicant Frame-Retransmission Number The authentication server notifies the back-end authenticator each time it receives a specific number of frames. Catalyst 6000 Family Software Configuration Guide—Releases 6.

1x configuration parameters to the default values and verify the configuration: Console> (enable) clear dot1x config This command will disable dot1x on all ports and take dot1x parameter values back to factory defaults. This example shows how to reset the 802.1x.Chapter 21 Configuring Authentication Configuring Switch Access Using AAA Resetting the 802. Do you want to continue (y/n) [n]? Console> (enable) show dot1x PAE Capability Authenticator Only Protocol Version 1 system-auth-control enabled max-req 2 quiet-period 60 seconds re-authperiod 3600 seconds server-timeout 30 seconds supp-timeout 30 seconds tx-period 30 seconds Setting the Trace Severity You can alter the trace severity for 802. The number setting affects the number of trace messages displayed. which also globally disables 802.3 and 6.1x configuration parameters to the default values.1x.1x authentication to 5: Console> (enable) set trace dot1x 5 DOT1X tracing set to 5 Warning!! Turning on trace may affect the operation of the system.1x configuration. set trace dot1x trace-level This example shows how to set the trace severity for 802. perform this task in privileged mode: Task Command Set the trace severity for 802.1x.1x authentication.4 21-46 78-13315-02 .1x authentication with this command.1x configuration parameters to the default values and globally disable 802.1x Configuration Parameters to the Default Values You can reset the 802. To reset the 802. high numbers result in more messages. Low numbers result in fewer messages. perform this task in privileged mode: Task Step 1 Step 2 Command clear dot1x config show dot1x Reset the 802. Verify the 802. To set the trace severity for 802. Use with caution.1x configuration parameters to the default values with a single command. Catalyst 6000 Family Software Configuration Guide—Releases 6.

------------4/1 connecting finished auto unauthorized Port Multiple-Host Re-authentication ----. Command show port dot1x help This example shows how to display the usage options for the show port dot1x command: Console> (enable) show port dot1x help Usage: show port dot1x [<mod[/port]>] show port dot1x statistics [<mod[/port]>] To display the values for all the parameters associated with the authenticator PAE and back-end authenticator on a specific port on a specific module.------------------.3 and 6. Command show port dot1x statistics mod/port Catalyst 6000 Family Software Configuration Guide—Releases 6.------------.----------------4/1 disabled enabled To display the statistics for the different types of EAP frames transmitted and received by the authenticator on a specific port on a specific module.4 78-13315-02 21-47 .1x authentication and its configuration: • • • • show port dot1x help show port dot1x show port dot1x statistics show dot1x To display the usage options for the show port dot1x command. perform this task in normal mode: Task Display the statistics for the different types of EAP frames transmitted and received by the authenticator on a specific port on a specific module. This example shows how to display the values for all the parameters associated with the authenticator PAE and back-end authenticator on port 1 on module 4: Console> (enable) show port dot1x 4/1 Port Auth-State BEnd-State Port-Control Port-Status ----. perform this task in normal mode: Task Command Display the values for all configurable and current show port dot1x mod/port state parameters associated with the authenticator PAE and back-end authenticator on a specific port on a specific module. perform this task in normal mode: Task Display the usage options for the show port dot1x command.Chapter 21 Configuring Switch Access Using AAA Configuring Authentication Using the show Commands You can use these show commands to access information about 802.------------------.---------.

---------. TACACS+ authentication is enabled and local authentication is disabled for both login and enable access to the switch for all Telnet connections.-------. Any user with access to the directly connected terminal can access the switch using the login and enable passwords.--------.---------.1x parameters. only local authentication is enabled for both login and enable access on the console port. Command show dot1x This example shows how to display the global 802. perform this task in normal mode: Task Display the PAE capabilities.-------. In this example.3 and 6.1x parameters: Console> (enable) show dot1x PAE Capability Authenticator Only Protocol Version 1 system-auth-control enabled max-req 2 quiet-period 60 seconds re-authperiod 3600 seconds server-timeout 30 seconds supp-timeout 30 seconds tx-period 30 seconds Authentication Example Figure 3 shows a simple network topology using TACACS+.4 21-48 78-13315-02 . When Workstation A attempts to connect to the switch. Catalyst 6000 Family Software Configuration Guide—Releases 6. protocol version.------------------4/1 0 0 0 0 00-00-00-00-00-00 To display the global 802.---------. system-auth-control. and other global dot1x parameters.------4/1 97 0 97 0 0 0 0 Port Rx_Invalid Rx_Len_Err Rx_Total Last_Rx_Frm_Ver Last_Rx_Frm_Src_Mac ----.Chapter 21 Authentication Example Configuring Switch Access Using AAA This example shows how to display the statistics for the different types of EAP frames transmitted and received by the authenticator on port 1 on module 4: Console> (enable) show port dot1x statistics 4/1 Port Tx_Req/Id Tx_Req Tx_Total Rx_Start Rx_Logoff Rx_Resp/Id Rx_Resp ----.--------.-------.-----. the user is challenged for a TACACS+ username and password.--------------. However.

20. Console> (enable) set authentication login tacacs enable telnet tacacs login authentication set to enable for telnet session.10 172.Chapter 21 Configuring Switch Access Using AAA Authentication Example Figure 21-3 TACACS+ Example Network Topology TACACS+ server 172. local authentication is enabled for console connections. Console> (enable) set authentication enable local disable telnet local enable authentication set to disable for telnet session.4 78-13315-02 18927 Terminal 21-49 .52.20. Console> (enable) show tacacs Tacacs key: tintin_et_milou Tacacs login attempts: 3 Tacacs timeout: 5 seconds Tacacs direct request: disabled Tacacs-Server ---------------------------------------172.3 and 6. and a TACACS+ encryption key is specified: Console> (enable) show tacacs Tacacs key: Tacacs login attempts: 3 Tacacs timeout: 5 seconds Tacacs direct request: disabled Tacacs-Server Status ---------------------------------------------Console> (enable) set tacacs server 172.10 Console> (enable) Status ------primary Catalyst 6000 Family Software Configuration Guide—Releases 6.52.10 added to TACACS server table as primary server. Console> (enable) set authentication login local disable telnet local login authentication set to disable for telnet session. Console> (enable) set authentication enable tacacs enable telnet tacacs enable authentication set to enable for telnet session.20. Console> (enable) set tacacs key tintin_et_milou The tacacs key has been set to tintin_et_milou.20.52.10 Switch Console port connection Workstation A This example shows how to configure the switch so that TACACS+ authentication is enabled for Telnet connections.52.

the authorization server receives the command and user information and compares it against an access list. then authorization will succeed immediately. Available options and fallback options include the following: • • • • tacacs+—If you have been authenticated. and there is no response from the TACACS+ server. otherwise. Authorization will fail if the TACACS+ server fails to respond. the user must supply a valid username and password pair to execute certain commands. The access list resides on the host running the TACACS+ or RADIUS server. page 21-li Authorization Overview Catalyst 6000 family switches support TACACS+ and RADIUS authorization. page 21-l TACACS+ Command Authorization. You can require authorization for all commands or for configuration (enable mode) commands only. page 21-l Authorization Events.4 21-50 78-13315-02 . and there is no response from the TACACS+ server. When a user issues a command. deny—Deny is strictly a fallback option. the user must supply a valid username and password pair to gain access to EXEC mode.3 and 6. then authorization will succeed immediately. This is the default behavior. page 21-li RADIUS Authorization. EXEC mode (normal login)—When the authorization feature is enabled for EXEC mode. Enable mode (privileged login)—When the authorization feature is enabled for enable mode. • • TACACS+ Primary Options and Fallback Options You can specify the primary option and fallback option used in the authorization process. Catalyst 6000 Family Software Configuration Guide—Releases 6. page 21-l TACACS+ Primary Options and Fallback Options. Authorization Events You can enable authorization for the following: • Commands—When you enable the authorization feature for commands. the user must supply a valid username and password pair to gain access to enable mode. none—Authorization will succeed if the TACACS+ server does not respond. Authorization is required only if you have enabled the authorization feature for enable mode.Chapter 21 Understanding How Authorization Works Configuring Switch Access Using AAA Understanding How Authorization Works These sections describe how authorization works: • • • • • Authorization Overview. Authorization limits access to specified users using a dynamically applied access list (or user profile) based on the username and password pair. If the user is authorized to issue that command. the command is executed. the command is not executed. if-authenticated—If you have been authenticated. The server responds to the user password information with an access list number that causes the specific list to be applied. Authorization is required only if you have enabled the authorization feature.

If there is a match. and then logs you in to the EXEC mode.3 and 6. the switch will verify that the argument string matches one of the commands listed above. the switch completes the command. Service-Type.Chapter 21 Configuring Switch Access Using AAA Understanding How Authorization Works TACACS+ Command Authorization You can require authorization for all commands or for configuration (enable mode) commands only. If you have Administrative/Shell (6) Service-Type access. the NAS authenticates you.4 78-13315-02 21-51 . This attribute is part of the user-profile. the switch forwards the command to the NAS for authorization. If you have enabled authorization for configuration commands only. Configuration commands include the following: • • • • • • • • • • • • • • copy clear commit configure delete download format reload rollback session set squeeze switch undelete The following TACACS+ authorization process occurs for every command that you enter: • • If you have disabled the command authorization feature. in the authentication protocol that provides authorization information. • RADIUS Authorization RADUIS has limited authorization. the TACACS+ server will allow you to execute any command on the switch. There is one attribute. Catalyst 6000 Family Software Configuration Guide—Releases 6. the switch forwards the command to the NAS for authorization. and then logs you in to the privileged mode. If you have enabled authorization for all commands. When you log in using RADIUS authentication and you do not have Administrative/Shell (6) Service-Type access. the network access server (NAS) authenticates you. If there is no match.

page 21-lii TACACS+ Authorization Configuration Guidelines. fallback option. You must specify the mode. Telnet connections. or both types of connections. Table 21-4 Default Authorization Configuration Feature TACACS+ login authorization (console and Telnet) TACACS+ EXEC authorization (console and Telnet) TACACS+ enable authorization (console and Telnet) TACACS+ commands authorization (console and Telnet) Default Value Disabled Disabled Disabled Disabled TACACS+ Authorization Configuration Guidelines Follow these guidelines when configuring TACACS+ authorization on the switch: • • • • TACACS+ authorization is disabled by default. See the “Specifying TACACS+ Servers” section on page 21-xvii or the “Specifying RADIUS Servers” section on page 21-xxiv for more information on server setup. See the “Specifying the TACACS+ Key” section on page 21-xix or the “Specifying the RADIUS Key” section on page 21-xxiv for more information on the key setup. page 21-lv TACACS+ Authorization Default Configuration Table 4 shows the TACACS+ default authorization configuration. • Configuring TACACS+ Authorization These sections describe how to configure TACACS+ authorization on the switch.3 and 6. and connection type when enabling authorization. option.4 21-52 78-13315-02 . Authorization configuration applies to console connections. page 21-lii Configuring RADIUS Authorization. • • Enabling TACACS+ Authorization. Configure RADIUS and TACACS+ servers before enabling authorization. page 21-lii Configuring TACACS+ Authorization. page 21-liv Catalyst 6000 Family Software Configuration Guide—Releases 6. page 21-liii Disabling TACACS+ Authorization. Configure RADIUS and TACACS+ keys to encrypt protocol packets before enabling authorization.Chapter 21 Configuring Authorization Configuring Switch Access Using AAA Configuring Authorization These sections describe how to configure authorization: • • • • TACACS+ Authorization Default Configuration.

Authorization is configured with the tacacs+ option. Console> This example shows how to enable TACACS+ command authorization for both console and Telnet connections. Enter the both keyword to enable authorization for both console port and Telnet connection attempts. The fallback option is deny: Console> (enable) set authorization commands enable config tacacs+ deny both Successfully enabled commands authorization. Enable authorization for enable mode. show authorization This example shows how to enable TACACS+ EXEC mode authorization for both console and Telnet connections. Authorization is configured with the tacacs+ option. Console> Step 4 This example shows how to enable TACACS+ enable mode authorization for console and Telnet connections. The fallback option is deny: Console> (enable) set authorization exec enable tacacs+ deny both Successfully enabled enable authorization. Enter the both keyword to enable authorization for both console port and Telnet connection attempts. Enter the console or telnet keyword if you want to enable authorization only for console port or Telnet connection attempts. Verify the TACACS+ authorization configuration. Enter the console or telnet keyword if you want to enable authorization only for console port or Telnet connection attempts. perform this task in privileged mode: Task Step 1 Command set authorization exec enable {option}{fallbackoption} [console | telnet | both] Enable authorization for normal mode.Chapter 21 Configuring Switch Access Using AAA Configuring Authorization Enabling TACACS+ Authorization To enable TACACS+ authorization on the switch. set authorization commands enable {config | Enter the console or telnet keyword if you want to all} {option}{fallbackoption} [console | telnet | both] enable authorization only for console port or Telnet connection attempts.3 and 6. Authorization is configured with the tacacs+ option. Step 2 set authorization enable enable {option} {fallbackoption} [console | telnet | both] Step 3 Enable authorization of configuration commands. The fallback option is deny: Console> (enable) set authorization enable enable tacacs+ deny both Successfully enabled enable authorization.4 78-13315-02 21-53 . Console> (enable) This example shows how to verify the configuration: Console> (enable) show authorization Telnet: ------Primary Fallback -------------exec: tacacs+ deny enable: tacacs+ deny commands: Catalyst 6000 Family Software Configuration Guide—Releases 6. Enter the both keyword to enable authorization for both console port and Telnet connection attempts.

3 and 6. Console> (enable) Catalyst 6000 Family Software Configuration Guide—Releases 6.4 21-54 78-13315-02 .Chapter 21 Configuring Authorization Configuring Switch Access Using AAA config: all: Console: -------- tacacs+ - deny - exec: enable: commands: config: tacacs+ all: Console> (enable) Primary ------tacacs+ tacacs+ Fallback -------deny deny deny - Disabling TACACS+ Authorization To disable TACACS+ authorization on the switch. Enter the console or telnet keyword if you want to disable authorization only for console port or Telnet connection attempts. Disable authorization for enable mode. Enter the both keyword to disable authorization for both console port and Telnet connection attempts. show authorization This example shows how to disable TACACS+ EXEC mode authorization for both console and Telnet connections and how to verify the configuration: Console> (enable) set authorization exec disable both Successfully disabled enable authorization. Enter the both keyword to disable authorization for both console port and Telnet connection attempts. set authorization enable disable [console | telnet | both] Step 2 Step 3 set authorization commands disable [console | Disable authorization of configuration commands. Console> (enable) Step 4 This example shows how to disable TACACS+ enable mode authorization for both console and Telnet connections and how to verify the configuration: Console> (enable) set authorization enable disable both Successfully disabled enable authorization. Enter the both keyword to disable authorization for both console port and Telnet connection attempts. Enter the console or telnet keyword if telnet | both] you want to disable authorization only for console port or Telnet connection attempts. perform this task in privileged mode: Task Step 1 Command Disable authorization for normal mode. Verify the TACACS+ authorization configuration. Enter the set authorization exec disable [console | telnet | console or telnet keyword if you want to disable both] authorization only for console port or Telnet connection attempts.

or 2-framed).3 and 6. Disabling RADIUS Authorization Enter the set authentication login radius disable command in privileged mode to disable RADIUS authorization. a value of 6) in the RADIUS server to launch the user into enable mode in the RADIUS server. Set the Service-Type (RADIUS attribute 6) for the user to Admistrative (that is. 1-login. Console> (enable) This example shows how to verify the configuration: Console> (enable) show authorization Telnet: ------Primary ------tacacs+ tacacs+ tacacs+ Fallback -------deny deny deny - exec: enable: commands: config: all: Console: -------- exec: enable: commands: