You are on page 1of 24

Cisco − Creating Ethernet VLANs on Catalyst Switches

Table of Contents
Creating Ethernet VLANs on Catalyst Switches.............................................................................................1 Document ID: 10023 ................................................................................................................................1 Introduction..........................................................................................................................................................1 Prerequisites.........................................................................................................................................................1 Requirements..........................................................................................................................................1 Components Used...................................................................................................................................2 Related Products.....................................................................................................................................2 Conventions............................................................................................................................................3 Configuring the VLAN on Catalyst Switches Running CatOS...........................................................................3 Create VLANs and Ports........................................................................................................................3 Remove Ports or VLANs........................................................................................................................6 Troubleshooting Tips..............................................................................................................................7 Configuring the VLAN on Catalyst 2900 XL, 3500 XL, 2950, 2970, and 2940 Series Switches......................8 Create VLANS and Ports........................................................................................................................8 Remove Ports or VLANS.....................................................................................................................12 Configuring Multi−VLAN Port on Catalyst 2900 XL/3500 XL.......................................................................14 Configuring the VLAN on Catalyst 3550, 3750, 4000/4500, and 6000/6500 Switches Running Integrated Cisco IOS Software (Native Mode)...................................................................................................................17 Create VLANs and Ports......................................................................................................................17 Remove VLANs ....................................................................................................................................22 Troubleshooting Tips............................................................................................................................22 NetPro Discussion Forums − Featured Conversations......................................................................................22 Related Information...........................................................................................................................................23

i

Creating Ethernet VLANs on Catalyst Switches
Document ID: 10023
Introduction Prerequisites Requirements Components Used Related Products Conventions Configuring the VLAN on Catalyst Switches Running CatOS Create VLANs and Ports Remove Ports or VLANs Troubleshooting Tips Configuring the VLAN on Catalyst 2900 XL, 3500 XL, 2950, 2970, and 2940 Series Switches Create VLANS and Ports Remove Ports or VLANS Configuring Multi−VLAN Port on Catalyst 2900 XL/3500 XL Configuring the VLAN on Catalyst 3550, 3750, 4000/4500, and 6000/6500 Switches Running Integrated Cisco IOS Software (Native Mode) Create VLANs and Ports Remove VLANs Troubleshooting Tips NetPro Discussion Forums − Featured Conversations Related Information

Introduction
This document provides basic information on how to create VLANs on Catalyst switches running Catalyst OS (CatOS) and Integrated Cisco IOS® Software (Native Mode). The sample commands for each section use one Catalyst switch from each configuration section.

Prerequisites
Requirements
Readers of this document should have knowledge of the information in this section. VLANs are a mechanism to allow network administrators to create logical broadcast domains that can span across a single switch or multiple switches, regardless of physical proximity. This is useful to reduce the size of broadcast domains or to allow groups or users to be logically grouped without the need to be physically located in the same place. To create VLANs, you must decide how to configure these items: • What VLAN Trunk Protocol (VTP) domain name and VTP mode will be used on this switch? • What ports on the switch will belong to which VLAN? • Will you need to have communication between VLANs, or will they be isolated? If you require communication between VLANs, you will need to use a Layer 3 (L3) routing device, such as an Cisco − Creating Ethernet VLANs on Catalyst Switches

Related Products The information in this document can also be used with the these switches: • Catalyst 4000/4500/2948G/2980G/4912G switches • Catalyst 5000/2926G family switches • Catalyst 6000/6500 family switches • Catalyst 2900 XL/3500 XL/2950/3550/3750 switches Cisco − Creating Ethernet VLANs on Catalyst Switches . For details on how to get basic connectivity to the switches. modules. and SUPIV For details on InterVLAN routing configuration on an MSFC. SUPIII.x)XU • Catalyst 4507 switch with SUPIV (WS−X4515) running Cisco IOS Software Release 12. refer to these documents: • Configuring InterVLAN Routing with Catalyst 3750/3560/3550 Series Switches • Configuring InterVLAN Routing on the MSFC • Configuring InterVLAN Routing on the RSM • Configuring InterVLAN Routing on the RSFC • Configuring InterVLAN Routing on an External Cisco Router • Configuring InterVLAN Routing Using an Internal Router (Layer 3 Card) on Catalyst 5500/5000 and 6500/6000 Switches That Run CatOS System Software • Configuring InterVLAN Routing and ISL/802.1Q Trunking on a Catalyst 2900 XL/3500 XL/2950 Switch Using An External Router Note: This document assumes that you have basic connectivity to the switch. All of the devices used in this document started with a cleared (default) configuration.1(13)EW1 The information in this document was created from the devices in a specific lab environment. RSFC. either through the console or through Telnet access.external Cisco router or an internal router module: ♦ WS−X4232−L3 card for Catalyst 4000 with Supervisor Engine I (SUPI) and SUPII ♦ Route Switch Module (RSM) or Route Switch Feature Card (RSFC) for Catalyst 5000 ♦ Multilayer Switch Module (MSM) or Multilayer Switch Feature Card (MSFC) for Catalyst 6000 Some of the switches have built−in support in software and hardware to do InterVLAN routing (no external device.5(x) software • Catalyst 3524XL switch running Cisco IOS Software Release 12.0(5. make sure that you understand the potential impact of any command. or external router. or daughter cards are required): ♦ Catalyst 3550/3750/6500 with SUP720 ♦ Catalyst 4000/4500 with SUPII+. If your network is live. refer to these documents: • Catalyst 6000 family switchesBasic Software Configuration • XL series switchesQuick Start Guide Components Used The information in this document is based on these hardware and software versions: • Catalyst 6009 switch running Catalyst OS 5. RSM.

Conventions For more information on document conventions. you must define a VTP domain name before you can add any VLANs. CatosSwitch> (enable) set vtp domain ? <name> Domain name CatosSwitch> (enable) set vtp domain cisco ? mode passwd pruning v2 Set Set Set Set VTP VTP VTP VTP mode password pruning version 2 CatosSwitch> (enable) set vtp domain cisco mode ? client server transparent VTP client mode VTP server mode VTP transparent mode CatosSwitch> (enable) set vtp domain cisco mode server VTP domain cisco modified Note: For details on VTP. Cisco − Creating Ethernet VLANs on Catalyst Switches . Configuring the VLAN on Catalyst Switches Running CatOS Create VLANs and Ports Follow these steps: 1. Before you can create a VLAN. This is the default VTP configuration on the switch: CatosSwitch> (enable) show vtp domain Domain Name Domain Index VTP Version Local Mode Password −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−−−−− −−−−−−−−−−− −−−−−−−−−−− −−−−−−−−−− 1 2 server − Vlan−count Max−vlan−storage Config Revision Notifications −−−−−−−−−− −−−−−−−−−−−−−−−− −−−−−−−−−−−−−−− −−−−−−−−−−−−− 5 1023 0 disabled Last Updater V2 Mode Pruning PruneEligible on Vlans −−−−−−−−−−−−−−− −−−−−−−− −−−−−−−− −−−−−−−−−−−−−−−−−−−−−−−−− 0. the switch must be in VTP server mode or VTP transparent mode.0. refer to the Cisco Technical Tips Conventions. to set the domain name and mode.0 disabled disabled 2−1000 Issue the set vtp command. regardless of the number of switches in the network (one or many) and regardless of whether you will use VTP to propagate VLANs to other switches in the network.0. refer to Understanding and Configuring VLAN Trunk Protocol (VTP). If the switch is a VTP server. This must be defined.

CatosSwitch> (enable) set vlan Cisco − Creating Ethernet VLANs on Catalyst Switches . CatosSwitch> (enable) show vtp domain Domain Name Domain Index VTP Version Local Mode Password −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−−−−− −−−−−−−−−−− −−−−−−−−−−− −−−−−−−−−− cisco 1 2 server − Vlan−count Max−vlan−storage Config Revision Notifications −−−−−−−−−− −−−−−−−−−−−−−−−− −−−−−−−−−−−−−−− −−−−−−−−−−−−− 5 1023 1 disabled Last Updater V2 Mode Pruning PruneEligible on Vlans −−−−−−−−−−−−−−− −−−−−−−− −−−−−−−− −−−−−−−−−−−−−−−−−−−−−−−−− 0. to display the parameters for all configured VLANs in the administrative domain. Once the VTP domain has been set and verified. Issue the show vlan command. 3. to create VLANs.2. to verify VTP configuration.0. Issue the show vtp domain command. you can use Output Interpreter ( registered customers only) to display potential issues and fixes. Vlans −−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−− −−−−−−− −−−−−−−−−−−−−−−−−−−−−−−− 1 default active 5 1/1−2 3/1−48 4/1−16 1002 fddi−default active 6 1003 token−ring−default active 9 1004 fddinet−default active 7 1005 trnet−default active 8 VLAN −−−− 1 1002 1003 1004 1005 VLAN −−−− 1 1002 1003 1004 1005 Type −−−−− enet fddi trcrf fdnet trbrf SAID −−−−−−−−−− 100001 101002 101003 101004 101005 MTU −−−−− 1500 1500 1500 1500 1500 Parent −−−−−− − − − − − RingNo −−−−−− − − − − − BrdgNo −−−−−− − − − − − Stp −−−− − − − − ibm BrdgMode −−−−−−−− − − − − − Trans1 −−−−−− 0 0 0 0 0 Trans2 −−−−−− 0 0 0 0 0 DynCreated −−−−−−−−−− static static static static static RSPAN −−−−−−−− disabled disabled disabled disabled disabled VLAN AREHops STEHops Backup CRF 1q VLAN −−−− −−−−−−− −−−−−−− −−−−−−−−−− −−−−−−− 1003 7 7 off a. there is only a single VLAN for all ports. VLAN 1 can not be renamed or deleted. and this VLAN is called default. you can begin to create VLANs on the switch. By default. CatosSwitch> (enable) show vlan VLAN Name Status IfIndex Mod/Ports.0 disabled disabled 2−1000 Note: If you have the output of a show vtp domain command from your Cisco device.0. Issue the set vlan command.

CatosSwitch> (enable) show vlan VLAN Name Status IfIndex Mod/Ports. trbrf) said = 1...4/1−12) set vlan <vlan_num> [name <name>] [type <type>] [state <state>] [pvlan−type <pvlan_type>] [said <said>] [mtu <mtu>] [ring <hex_ring_number>] [decring <decimal_ring_number>] [bridge <bridge_number>] [parent <vlan_num>] [mode <bridge_mode>] [stp <stp_type>] [translation <vlan_num>] [backupcrf <off|on>] [aremaxhop <hopcount>] [stemaxhop <hopcount>] [rspan] (name = 1. fddi.isolated.0xfff..32 characters.3/1−2. decimal_ring_number = 1. If you want to add ports to the VLAN.. issue the set vlan vlan_number mod/ports command..1005.. to verify the VLAN configuration. auto).18190 pvlan−type = (primary. state = (active..4095 bridge_number = 0x1. mode = (srt.. Issue the show vlan command. suspend) type = (ethernet. CatosSwitch> (enable) set vlan 2 3/1−12 VLAN 2 modified. VLAN 1 modified.community. trcrf.4294967294.none) hex_ring_number = 0x1. srb) stp = (ieee.2/1−12.0xf.13) Set vlan commands: −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− set vlan Set vlan information set vlan mapping Map an 802. translation = 1. c. VLAN Mod/Ports Cisco − Creating Ethernet VLANs on Catalyst Switches . Vlans −−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−− −−−−−−− −−−−−−−−−−−−−−−−−−−− 1 default active 5 1/1−2 3/1−48 4/1−16 2 cisco_vlan_2 active 75 1002 fddi−default active 6 1003 token−ring−default active 9 1004 fddinet−default active 7 1005 trnet−default active 8 VLAN −−−− 1 2 1002 1003 1004 1005 Type −−−−− enet enet fddi trcrf fdnet trbrf SAID −−−−−−−−−− 100001 100002 101002 101003 101004 101005 MTU −−−−− 1500 1500 1500 1500 1500 1500 Parent −−−−−− − − − − − − RingNo −−−−−− − − − − − − BrdgNo −−−−−− − − − − − − Stp −−−− − − − − − IBM BrdgMode −−−−−−−− − − − − − − Trans1 −−−−−− 0 0 0 0 0 0 Trans2 −−−−−− 0 0 0 0 0 0 !−−− Output suppressed. mtu = 576. IBM.1005 hopcount = 1.1q vlan to an Ethernet vlan CatosSwitch> (enable) set vlan 2 name cisco_vlan_2 Vlan 2 configuration successful b. fddinet.. parent = 2.Usage: set vlan <vlan> <mod/port> (An example of mod/port is 1/1.

CatosSwitch> (enable) clear vlan 3 This command will deactivate all ports on vlan 3 Cisco − Creating Ethernet VLANs on Catalyst Switches . The switch displays a warning and gives you the opportunity to cancel the current request. For example. This is essentially what happens when you assign a port to any VLAN. 1 modified. You can also create the VLAN and add the ports to that VLAN with all the information in a single command. issue this command: CatosSwitch> (enable) set vlan 3 3/13−15 Vlan VLAN VLAN VLAN −−−− 3 3 configuration successful 3 modified. Mod/Ports −−−−−−−−−−−−−−−−−−−−−−− 3/13−15 15/1 4. if you want to create the third VLAN and then assign ports 3/13 through 3/15 to that VLAN. Issue the show vlan command. issue the clear vlan command. issue the set vlan vlan_number mod/ports command and place the ports in a different VLAN. because they remain a part of that VLAN and it no longer exists. To delete a VLAN. Remove Ports or VLANs To remove ports from a VLAN. Vlans −−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−− −−−−−−− −−−−−−−−−−−−−−−−−−−−−−−− 1 default active 5 1/1−2 3/16−48 4/1−16 2 cisco_vlan_2 active 75 3/1−12 3 VLAN0003 active 76 3/13−15 1002 fddi−default active 6 1003 token−ring−default active 9 1004 fddinet−default active 7 1005 trnet−default active 8 VLAN −−−− 1 2 3 1002 1003 1004 1005 Type −−−−− enet enet enet fddi trcrf fdnet trbrf SAID −−−−−−−−−− 100001 100002 100003 101002 101003 101004 101005 MTU −−−−− 1500 1500 1500 1500 1500 1500 1500 Parent −−−−−− − − − − − − − RingNo −−−−−− − − − − − − − BrdgNo −−−−−− − − − − − − − Stp −−−− − − − − − − IBM BrdgMode −−−−−−−− − − − − − − − Trans1 −−−−−− 0 0 0 0 0 0 0 Trans2 −−−−−− 0 0 0 0 0 0 0 !−−− Output suppressed. because all ports initially belonged to VLAN 1. to verify the VLAN configuration.−−−− −−−−−−−−−−−−−−−−−−−−−−− 2 3/1−12 15/1 d. The ports are deactivated. CatosSwitch> (enable) show vlan VLAN Name Status IfIndex Mod/Ports.

To correct this. Do you want to continue(y/n) [n]? y Vlan 3 deleted CatosSwitch> (enable) show vlan VLAN Name Status IfIndex Mod/Ports. This means that the VLAN to which the ports originally belonged was deleted. you receive this error message: Cannot add/modify VLANs on a VTP server without a domain name. You can either recreate that VLAN or correct the VTP configuration so that the VLAN is re−established in the VTP domain. Vlans −−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−− −−−−−−− −−−−−−−−−−−−−−−−−−−−−−−− 1 default active 5 1/1−2 3/16−48 4/1−16 2 cisco_vlan_2 active 75 3/1−12 1002 fddi−default active 6 1003 token−ring−default active 9 1004 fddinet−default active 7 1005 trnet−default active 8 VLAN −−−− 1 2 1002 1003 1004 1005 Type −−−−− enet enet fddi trcrf fdnet trbrf SAID −−−−−−−−−− 100001 100002 101002 101003 101004 101005 MTU −−−−− 1500 1500 1500 1500 1500 1500 Parent −−−−−− − − − − − − RingNo −−−−−− − − − − − − BrdgNo −−−−−− − − − − − − Stp −−−− − − − − − IBM BrdgMode −−−−−−−− − − − − − − Trans1 −−−−−− 0 0 0 0 0 0 Trans2 −−−−−− 0 0 0 0 0 0 !−−− Output suppressed. usually because of VTP. For details on VTP. This is sample show port mod/port command output: CatosSwitch> (enable) show port 3/1 Port Name Status Vlan Duplex Speed Type −−−−− −−−−−−−−−−−−−−−−−− −−−−−−−−−− −−−−−−−−−− −−−−−− −−−−− −−−−−−−−−−−− Cisco − Creating Ethernet VLANs on Catalyst Switches . • Ports are in inactive state in show port mod/port command output. you receive this error message: Cannot add/modify VLANs on a VTP client. Troubleshooting Tips This section provides troubleshooting tips for common problems that you might encounter while you are creating VLANs on Catalyst switches running CatOS: • If you create a VLAN when there is no VTP domain name defined. as shown in the Create VLANs and Ports section. They will not be displayed until you add them back in another VLAN. Note: Ports 3/13 through 3/15 are not displayed in that show vlan command. refer to Understanding and Configuring VLAN Trunk Protocol (VTP). create a VTP domain name on the switch. as they are deactivated by the removal of VLAN 3. • If you create a VLAN on a switch that is in VTP client mode.in the entire management domain. Note: A switch is only allowed to create VLANs if it is in VTP server or VTP transparent modes.

3/1 Port inactive AuxiliaryVlan AuxVlan−Status 2 auto auto 10/100BaseTX PowerAllocated mWatt mA @42V −−−−− −−−−−−−− − − InlinePowered Admin Oper Detected −−−−− −−−−−−−−−−−−− −−−−−−−−−−−−−− −−−−− −−−−−− −−−−−−−− 3/1 none none − − − !−−− Output suppressed. 3500 XL. Vlans −−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−− −−−−−−− −−−−−−−−−−−−−−−−−−−−−−−− Unable to access VTP Vlan 2 information. VLAN DynCreated RSPAN −−−− −−−−−−−−−− −−−−−−−− Unable to access VTP Vlan 2 information. CatosSwitch> (enable) show vlan 2 VLAN Name Status IfIndex Mod/Ports. and 2940 Series Switches Create VLANS and Ports Note: Depending on your model of switch. If you have the output of a show−tech support command from your Cisco device. Follow these steps: 1. and you can automatically communicate those changes to all of the other switches in the network. The default VTP mode is the server mode. you can make configuration changes centrally on a single switch. 2950. VLAN Type SAID MTU Parent RingNo BrdgNo Stp BrdgMode Trans1 Trans2 −−−− −−−−− −−−−−−−−−− −−−−− −−−−−− −−−−−− −−−−−− −−−− −−−−−−−− −−−−−− −−−−−− Unable to access VTP Vlan 2 information. Before you create VLANs. you can use Output Interpreter ( registered customers only) to display potential issues and fixes. 2970. For details on VTP. you must decide whether to use VTP in your network. you may see output different from some of commands that are displayed in this section. on the switches mentioned in this section. VLAN AREHops STEHops Backup CRF 1q VLAN −−−− −−−−−−− −−−−−−− −−−−−−−−−− −−−−−−− Configuring the VLAN on Catalyst 2900 XL. 3524XL# show vtp status VTP Version : 2 Configuration Revision : 0 Maximum VLANs supported locally : 254 Cisco − Creating Ethernet VLANs on Catalyst Switches . With VTP. to check the VTP status on XL series switches. refer to Understanding and Configuring VLAN Trunk Protocol (VTP). Note: Issue the show vtp status command.

0 at 0−0−00 00:00:00 2. For details on VTP. Fa0/11. VLAN 1 can not be renamed or deleted.Number of existing VLANs VTP Operating Mode !−−− This is the default mode. Fa0/13. Fa0/7. Fa0/9. Issue the show vlan command. !−−− You may skip this command. to configure any VLAN. Fa0/15.0.0. to check the VLAN information. Fa0/20. By default. and this VLAN is called default. you can begin to create VLANs on the switch. Fa0/3. Gi0/1. Fa0/18. to create another VLAN: 3524XL# vlan database !−−− You must enter into VLAN database. Fa0/8. Fa0/5. Fa0/6. if the switch is already in server mode and you !−−− want the switch to be in server mode. Note: A switch is only allowed to create VLANs if it is in VTP server or VTP transparent modes. Fa0/16. : 5 : Server VTP Domain Name : VTP Pruning Mode : Disabled VTP V2 Mode : Disabled VTP Traps Generation : Disabled MD5 digest : 0xBF 0x86 0x94 0x45 0xFC 0xDF 0xB5 0x70 Configuration last modified by 0. there is only a single VLAN for all ports. Fa0/17. Fa0/24. Fa0/22. Fa0/23. Fa0/14. Fa0/2. refer to Understanding and Configuring VLAN Trunk Protocol (VTP). Fa0/4. Fa0/12. 3524XL# show vlan VLAN Name Status Ports −−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− 1 default active Fa0/1. 3524XL(vlan)# vtp server Device mode already VTP SERVER. Fa0/19. Once the VTP domain has been set and verified. Fa0/21. Gi0/2 1002 fddi−default active 1003 token−ring−default active 1004 fddinet−default active 1005 trnet−default active VLAN −−−− 1 1002 1003 1004 1005 Type −−−−− enet fddi tr fdnet trnet SAID −−−−−−−−−− 100001 101002 101003 101004 101005 MTU −−−−− 1500 1500 1500 1500 1500 Parent −−−−−− − − 1005 − − RingNo −−−−−− − − 0 − − BridgeNo −−−−−−−− − − − 1 1 Stp −−−− − − − IBM IBM BrdgMode −−−−−−−− − − srb − − Trans1 −−−−−− 1002 1 1 0 0 Trans2 −−−−−− 1003 1003 1002 0 0 Issue this set of commands in privileged mode. 524XL(vlan)# vlan ? Cisco − Creating Ethernet VLANs on Catalyst Switches . Fa0/10.

Fa0/9. Fa0/20. Fa0/6. Fa0/18. Fa0/11. Fa0/5. Fa0/12. Fa0/21.10 SAID Operational state of the VLAN Maximum number of Spanning Tree Explorer hops for this VLAN Spanning tree characteristics of the VLAN ID number of the first translational VLAN for this VLAN (or zero if none) ID number of the second translational VLAN for this VLAN (or zero if none) 3524XL(vlan)# vlan 2 name ? WORD The ASCII name for the VLAN 3524XL(vlan)# vlan 2 name cisco_vlan_2 VLAN 2 added: Name: cisco_vlan_2 3524XL(vlan)# exit !−−− You have to exit from the VLAN database. Fa0/19. Fa0/13. Issue the show vlan command.<1−1005> ISL VLAN index 3524XL(vlan)# vlan 2 ? are backupcrf bridge media mtu name parent ring said state ste stp tb−vlan1 tb−vlan2 Maximum number of All Route Explorer hops for this VLAN Backup CRF mode of the VLAN Bridging characteristics of the VLAN Media type of the VLAN VLAN Maximum Transmission Unit Ascii name of the VLAN ID number of the Parent VLAN of FDDI or Token Ring type VLANs Ring number of FDDI or Token Ring type VLANs IEEE 802. Fa0/22. for the changes to be committed. Fa0/4. Gi0/2 2 cisco_vlan_2 active 1002 fddi−default active 1003 token−ring−default active 1004 fddinet−default active 1005 trnet−default active VLAN −−−− 1 2 1002 1003 1004 1005 Type −−−−− enet enet fddi tr fdnet trnet SAID −−−−−−−−−− 100001 100002 101002 101003 101004 101005 MTU −−−−− 1500 1500 1500 1500 1500 1500 Parent −−−−−− − − − 1005 − − RingNo −−−−−− − − − 0 − − BridgeNo −−−−−−−− − − − − 1 1 Stp −−−− − − − − IBM BrdgMode −−−−−−−− − − − srb − Trans1 −−−−−− 1002 0 1 1 0 Trans2 −−−−−− 1003 0 1003 1002 0 Cisco − Creating Ethernet VLANs on Catalyst Switches . Fa0/17. 3524XL# show vlan VLAN Name Status Ports −−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− 1 default active Fa0/1. to ensure that the VLAN is created. Fa0/24. Fa0/23. Fa0/3.. Fa0/8. APPLY completed. Fa0/7. 3524XL# 3. Fa0/2. Fa0/16. Fa0/14. Exiting. Fa0/15. Fa0/10... Gi0/1.

Fa0/15. 3524XL(config−if)# end 3524XL# 00:55:26: %SYS−5−CONFIG_I: Configured from console by console 3524XL# write memory !−−− Saves the configuration. 5. Fa0/20. 3524XL(config−if)# exit 3524XL(config)# interface fastEthernet 0/3 3524XL(config−if)# switchport access vlan 2 !−−− Those two commands assign interface Fa0/3 to VLAN 2. Fa0/17. to verify the VLAN configuration. Gi0/2 2 cisco_vlan_2 active Fa0/2. Fa0/9. to add a particular interface in the VLAN: 3524XL# configure terminal Enter configuration commands. Building configuration. 3524XL(config)# interface fastEthernet 0/2 3524XL(config−if)# switchport access ? vlan Set VLAN when interface is in access mode End with CNTL/Z. but they support only one active VLAN interface at a time. Fa0/16. Fa0/3 1002 fddi−default active 1003 token−ring−default active 1004 fddinet−default active 1005 trnet−default active Cisco − Creating Ethernet VLANs on Catalyst Switches . Fa0/6. You have to go to interface configuration mode for each of the interfaces that you want to add into the new VLAN. Fa0/22. Issue the show vlan command. this interfaces VLAN is controlled by VMPS 3524XL(config−if)# switchport access vlan 2 !−−− Those two commands assign interface Fa0/2 to VLAN 2. Fa0/8. Fa0/13. Fa0/18. Issue this set of commands in privileged mode.4. Fa0/23. You may want to add ports (interfaces) in the newly created VLAN. Fa0/24. Fa0/11. Note: The ports of Layer 2 XL series switches can be assigned to multiple VLANs. Fa0/5. 3524XL(config−if)# switchport access vlan ? <1−1001> dynamic VLAN ID of the VLAN when this port is in access mode When in access mode.. Fa0/7. Fa0/19. Fa0/21. 3524XL# show vlan VLAN Name Status Ports −−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− 1 default active Fa0/1. Fa0/14. one per line. Fa0/12. Fa0/4. Fa0/10. Gi0/1..

Fa0/4. one per line. that port is automatically added back to the default VLAN. if you want to remove interface Fa0/2 from cisco_vlan_2 (VLAN 2). issue this set of commands in privileged mode: 3524XL# configure terminal Enter configuration commands. Fa0/7. Gi0/1. 3524XL(config)# interface fastEthernet 0/2 3524XL(config−if)# no switchport access vlan 2 !−−− Those two commands remove interface Fa0/2 from VLAN 2.VLAN −−−− 1 2 1002 1003 1004 1005 Type −−−−− enet enet fddi tr fdnet trnet SAID −−−−−−−−−− 100001 100002 101002 101003 101004 101005 MTU −−−−− 1500 1500 1500 1500 1500 1500 Parent −−−−−− − − − 1005 − − RingNo −−−−−− − − − 0 − − BridgeNo −−−−−−−− − − − − 1 1 Stp −−−− − − − − IBM IBM BrdgMode −−−−−−−− − − − srb − − Trans1 −−−−−− 1002 0 1 1 0 0 Trans2 −−−−−− 1003 0 1003 1002 0 0 Remove Ports or VLANS To remove ports from the VLAN. Fa0/5. Gi0/2 Fa0/3 End with CNTL/Z. Fa0/17. Fa0/16. Fa0/11. 2 1002 1003 1004 1005 VLAN −−−− 1 2 1002 1003 1004 1005 cisco_vlan_2 fddi−default token−ring−default fddinet−default trnet−default Type −−−−− enet enet fddi tr fdnet trnet SAID −−−−−−−−−− 100001 100002 101002 101003 101004 101005 MTU −−−−− 1500 1500 1500 1500 1500 1500 Parent −−−−−− − − − 1005 − − active active active active active RingNo −−−−−− − − − 0 − − BridgeNo −−−−−−−− − − − − 1 1 Stp −−−− − − − − IBM IBM BrdgMode −−−−−−−− − − − srb − − Trans1 −−−−−− 1002 0 1 1 0 0 Trans2 −−−−−− 1003 0 1003 1002 0 0 Cisco − Creating Ethernet VLANs on Catalyst Switches . Fa0/13. Fa0/18. Fa0/14. Fa0/20. Fa0/15. !−−− Note that Fa0/2 is added back to the default VLAN. Fa0/24. issue the no switchport access vlan vlan_number command in interface configuration mode. Fa0/19. For example. Fa0/12. Fa0/10. Fa0/21. Fa0/9. Fa0/22. Fa0/23. Fa0/8. Fa0/2. 3524XL(config−if)# end 3524XL# show vlan VLAN Name Status Ports −−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− 1 default active Fa0/1. Fa0/6. Once the port is removed from a VLAN that is not VLAN 1 (the default VLAN).

you can use Output Interpreter ( registered customers only) to display potential issues and fixes. you have to add interface Fa0/3 to the default VLAN (VLAN 1). Fa0/19. Fa0/20. 3524XL# show interfaces fastEthernet 0/3 FastEthernet0/3 is down.. Fa0/23. Fa0/11. Fa0/10. Exiting. Fa0/14. 3524XL(vlan)# exit APPLY completed. Gi0/1. as it is deactivated by the removal of VLAN 2. it will neither be displayed nor usable. Fa0/9. refer Cisco − Creating Ethernet VLANs on Catalyst Switches . Unless you add it back in another VLAN. Gi0/2 1002 fddi−default active 1003 token−ring−default active 1004 fddinet−default active 1005 trnet−default active !−−− Output suppressed. Fa0/4. Fa0/13. Fa0/12. Fa0/18. because they no longer belong to any VLAN. Notice that port Fa0/3 is not displayed in that show vlan command output. Interfaces that were in that VLAN will remain a part of that VLAN and be deactivated. Fa0/24. For example. 3524XL# show vlan VLAN Name Status Ports −−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− 1 default active Fa0/1. Fa0/7.To delete the VLAN.. In the previous case. Fa0/15. To make the interface usable. Fa0/17. If you have the output of a show−tech support command from your Cisco device. Fa0/2. issue this set of commands in privileged mode: 3524XL# vlan database !−−− Enters the VLAN database mode. Fa0/22. you can still use the interface without adding it to a VLAN. Deleting VLAN 2. you must ensure that it belongs to some VLAN. to make this interface usable.. if you want to delete cisco_vlan_2 from the switch... line protocol is down !−−− Output suppressed. Fa0/5. Fa0/21. For further details on L3 interfaces on Catalyst 3550 Switches. Note: In the case of Catalyst 3550 switches. Fa0/8. Fa0/16. 3524XL(vlan)# no vlan 2 !−−− Removes the VLAN from the database. issue the no vlan vlan_number command in VLAN database mode. Fa0/6. if you make that interface an L3 interface.

The switch automatically transitions to VTP transparent mode when the multi−VLAN port feature is enabled.2.3 Cisco − Creating Ethernet VLANs on Catalyst Switches . three VLANs are created on a Catalyst 3512 XL switch. Configuring Multi−VLAN Port on Catalyst 2900 XL/3500 XL The multi−VLAN port feature on Catalyst 2900 XL/3500 XL switches allows you to configure a single port in two or more VLANs. Fa0/4 Fa0/5 2 3 4 5 6 VLAN0002 VLAN0003 VLAN0004 VLAN0005 VLAN0006 active active active active active In that example. 2. Fa0/6. which makes the VTP disabled. port Fa0/1 is connected to an external router. 3500 XL. 6−3512xl(config−if)# switchport multi vlan 1. Fa0/7. No VTP configuration is required. 2970. VLAN traffic on the multi−VLAN port is not encapsulated as it is in trunking. and add assigned VLANs to the multi−VLAN port. Fa0/10. Fa0/8. This feature allows users from different VLANs to access a server or router without the implementation of InterVLAN routing capability. Fa0/3. and one port of the switch is connected to an external router. Fa0/9. 6−3512xl# configure terminal Enter configuration commands. and 2940 Series Switches section of this document. Configure the Fa0/1 port in multi−VLAN mode. You must connect the multi−VLAN port only to a router or server. Gi0/2 Fa0/2. • The multi−VLAN port feature is supported only on Catalyst 2900 XL/3500 XL series switches. 6−3512xl# show vlan VLAN Name Status −−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−− 1 default active Ports −−−−−−−−−−−−−−−−−−−−−−−−−−−−− Fa0/1. one per line. To show how the multi−VLAN port is configured. A multi−VLAN port performs normal switching functions in all of its assigned VLANs. 6−3512xl(config−if)# switchport multi vlan ? LINE add remove VLAN IDs of VLANs to be used in multi−VLAN mode add VLANs to the current list remove VLANs from the current list End with CNTL/Z. For more information about how to create VLANs and assign ports to VLANs. Fa0/12. refer to the Configuring the VLAN on Catalyst 2900 XL. The port connected to the router will be configured as a multi−VLAN port. 2950. 6−3512xl(config)# interface fa0/1 6−3512xl(config−if)# switchport mode multi !−−− Changes port Fa0/1 mode to multi. Fa0/11. Gi0/1. 1. This feature is not supported on Catalyst 4000/5000/6000 series or any other Cisco Catalyst switches.to the Configuring Layer 3 Interfaces section of Configuring Interface Characteristics. Note: These are the limitations to the implementation of multi−VLAN port features: • You can not configure a multi−VLAN port when a trunk is configured on the switch.

now it is assigned to !−−− multiple VLANs 1. 6−3512xl(config−if)# ^Z 6−3512xl# 3.255. Fa0/5 4. Issue the ping command from switch to router. to verify the multi−VLAN operation. Cisco − Creating Ethernet VLANs on Catalyst Switches . Fa0/9.168. Fa0/7. 3 4 5 VLAN0003 VLAN0004 VLAN0005 active active active Fa0/1.1. 6−3512xl(config−if)# ^Z End with CNTL/Z. Issue the show interface interface−id switchport and show vlan commands. 2. Fa0/6.!−−− Assigns VLANs 1. 6−3512xl# show interface fa0/1 switchport Name: Fa0/1 Operational Mode: multi !−−− The port is in multi−VLAN mode. or 3.255. Fa0/1 Fa0/12. Fa0/10.1 255. The ping command should get a reply from the router every time the management IP address is assigned to any of the VLANs 1. Administrative Trunking Encapsulation: isl Operational Trunking Encapsulation: isl Negotiation of Trunking: Disabled Access Mode VLAN: 0 ((Inactive)) Trunking Native Mode VLAN: 1 (default) Trunking VLANs Enabled: NONE Pruning VLANs Enabled: NONE Priority for untagged frames: 0 Override vlan tag priority: FALSE Voice VLAN: none Appliance trust: none 6−3512xl# show vlan brief VLAN Name Status −−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−− 1 default active Ports −−−−−−−−−−−−−−−−−−−−−−−−−−−− Fa0/1. 2. 2. 6−3512xl# configure terminal Enter configuration commands. Fa0/4 2 VLAN0002 active !−−− Note: Previously. Fa0/8. Gi0/1. Fa0/2. and 3 to multi−VLAN port Fa0/1.0 !−−− The management IP address is assigned to VLAN 1. 6−3512xl(config)# interface vlan 1 6−3512xl(config−if)# ip address 192. Gi0/2 Fa0/1. to verify the configuration. port Fa0/1 was only in VLAN 1. one per line. Fa0/3. and 3.

1 Type escape sequence to abort.1. timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5).1. round−trip min/avg/max = 1/202/1004 ms 6−3512xl# configure terminal Enter configuration commands. 6−3512xl(config)# interface vlan 1 6−3512xl(config−if)# no ip address !−−− The management IP address is removed from VLAN 1. Sending 5. 100−byte ICMP Echos to 192. timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5). 6−3512xl(config−if)# shutdown 6−3512xl(config−if)# exit 6−3512xl(config)# interface vlan 2 6−3512xl(config−subif)# ip address 192. timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5).255.168. 100−byte ICMP Echos to 192.255. Cisco − Creating Ethernet VLANs on Catalyst Switches . Sending 5.1.168. round−trip min/avg/max = 1/1/3 ms 6−3512xl# configure terminal Enter configuration commands. Sending 5.2. End with CNTL/Z.168. one per line. round−trip min/avg/max = 1/2/3 ms 6−3512xl# ping 192. 100−byte ICMP Echos to 192.2.168.1.1.1 255.1. one per line.0 6−3512xl(config−subif)# no shutdown !−−− The management IP address is assigned to VLAN 2.1.168.1 Type escape sequence to abort. 100−byte ICMP Echos to 192.1.2 !−−− You can ping the router from VLAN 1. round−trip min/avg/max = 1/1/3 ms 6−3512xl# ping 192.6−3512xl# 23:56:54: %SYS−5−CONFIG_I: Configured from console by console 6−3512xl# ping 192.1.168.1.168.2 !−−− You can ping the router from VLAN 2. End with CNTL/Z. 6−3512xl(config−subif)# exit 6−3512xl(config)# exit 6−3512xl# ping 192. timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5). Sending 5.168.168.1. Type escape sequence to abort. Type escape sequence to abort.

0 6−3512xl(config−subif)# no shut !−−− The management IP address is assigned to VLAN 3. refer to Understanding and Configuring VTP. timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5). 3750. VLANs can be created in either VLAN database or global configuration mode. VLANs numbered higher than Cisco − Creating Ethernet VLANs on Catalyst Switches .1.2 !−−− You can ping the router from VLAN 3. and 6000/6500 Switches Running Integrated Cisco IOS Software (Native Mode) Create VLANs and Ports This section uses the Catalyst 4500 for sample configuration commands.1. 4000/4500. but the configuration tasks also apply to other switches that run L3 (or Integrated Cisco Software IOS (Native Mode)). the switch must be in VTP server mode or VTP transparent mode. 6−3512xl(config−subif)# exit 6−3512xl(config)# exit 6−3512xl# ping 192. For more information on configuring VTP on Catalyst 4000/4500 Cisco IOS−based Supervisor modules. Before you can create a VLAN.1.255. you must define a VTP domain name before you add any VLANs. and 6500 series switches that run Integrated Cisco IOS Software (Native Mode). round−trip min/avg/max = 1/1/3 ms 6−3512xl# ping 192. This includes the Catalyst 3550.2. regardless of the number of switches in the network (one or many) and regardless of whether you will use VTP to propagate VLANs to other switches in the network.1.255. timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5). 3570.1 255. This must be defined. round−trip min/avg/max = 1/205/1004 ms Configuring the VLAN on Catalyst 3550.168. Sending 5.1 Type escape sequence to abort.168. refer to the Software Configuration Guide for the switch platform under consideration. 100−byte ICMP Echos to 192.168.168.168. If the switch is a VTP server. Type escape sequence to abort.6−3512xl(config)# interface vlan 2 6−3512xl(config−subif)# no ip address !−−− The management IP address is removed from VLAN 2. 100−byte ICMP Echos to 192. For VTP configuration information for other Catalyst switch platforms.1. Sending 5. 6−3512xl(config−subif)# shutdown 6−3512xl(config−subif)# exit 6−3512xl(config)# interface vlan 3 6−3512xl(config−subif)# ip address 192.1.

dat file in Catalyst 4000 switches with SUPIV is the cat4000_flash directory. Gi3/2 Gi3/3. Issue the show vlan command. Gi3/6 Gi3/7. Gi3/16. Gi3/12.10. VLANs numbered higher than 1005 will not be advertised by VTP. Gi3/18 !−−− Output suppressed.1 on interface Vl1 (lowest numbered VLAN interface) 1. Gi3/9. Gi3/14 Gi3/15. Switch# dir cat4000_flash: Directory of cat4000_flash:/ 1 −rw− 676 <no date> vlan. Gi3/17. Gi3/5. Furthermore.0.dat 524260 bytes total (523584 bytes free) Note: A Catalyst 6500 switch running Integrated Cisco IOS Software (Native Mode) allows you to create VLANs in server mode without a VTP domain name. to check the VLAN information. and the VTP mode needs to be set to transparent to create these VLANs.10. Gi3/13.dat file. The default location of the VLAN . Switch# show vtp status VTP Version : 2 Configuration Revision : 0 Maximum VLANs supported locally : 1005 Number of existing VLANs : 8 VTP Operating Mode : Server VTP Domain Name : cisco VTP Pruning Mode : Enabled VTP V2 Mode : Disabled VTP Traps Generation : Disabled MD5 digest : 0xA4 0x18 0x78 0x52 0x5A 0x1B 0x2E 0x14 Configuration last modified by 0. Gi3/10 Gi3/11. Gi3/4.0 at 5−28−01 05:17:02 Local updater ID is 10. VLANs numbered higher than 1005 are stored in the switch configuration file and not in the VLAN . VLAN −−−− 1002 1003 1004 1005 VLAN −−−− 1 1002 1003 1004 Name −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− fddi−default token−ring−default fddinet−default trnet−default Type −−−−− enet fddi tr fdnet SAID −−−−−−−−−− 100001 101002 101003 101004 MTU −−−−− 1500 1500 1500 1500 Parent −−−−−− − − − − Status Ports −−−−−−−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− act/unsup act/unsup act/unsup act/unsup BridgeNo −−−−−−−− − − − − Stp −−−− − − − ieee BrdgMode −−−−−−−− − − − − Trans1 −−−−−− 0 0 0 0 Trans2 −−−−−− 0 0 0 0 RingNo −−−−−− − − − − Cisco − Creating Ethernet VLANs on Catalyst Switches . Gi3/1.1005 have to be created in global configuration mode. The show vtp status command shows the VTP information in the switch. Gi3/8. Gi1/2. Switch# show vlan VLAN Name Status Ports −−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− 1 default active Gi1/1.0.

issue the vlan database command in privileged mode.) Issue the exit command to exit out of VLAN database mode. To enter VLAN database mode. Switch(vlan)# vlan 2 VLAN 2 added: Name: VLAN0002 Switch(vlan)# apply APPLY completed. Note: You can either issue the apply command or exit out of VLAN database mode.. Switch# show running−config Building configuration. VLANs in Integrated Cisco IOS Software (Native Mode) can be created in either VLAN database mode or global configuration mode. for the configuration to take effect. Switch# vlan database Switch(vlan)# 3.1 no service pad service timestamps debug uptime service timestamps log uptime no service password−encryption service compress−config ! hostname Switch ! ! ip subnet−zero ! spanning−tree extend system−id ! redundancy mode rpr main−cpu auto−sync standard ! Cisco − Creating Ethernet VLANs on Catalyst Switches . (The end keyword and Ctrl−Z exit methods do not work in VLAN database mode. Current configuration : 2975 bytes ! version 12. Issue the vlan vlan_number command. to configure a VLAN. Issue the show run command.. to view VLANs numbered higher than 1005 in the running configuration.1005 trnet 101005 1500 − − − ibm − 0 0 Primary Secondary Type Ports −−−−−−− −−−−−−−−− −−−−−−−−−−−−−−−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− 2. VLAN configuration in global configuration mode is done in this manner: Switch(config)# vlan 3 Switch(config−vlan)# exit Switch(config)# 4.

Note: If the interface is configured as a L3 interface (the no switchport command is configured). 3750. The command to assign an interface to a VLAN is switchport access vlan vlan_number . By default. this minimum configuration is required: Switch(config)# interface gigabitEthernet 3/1 Switch(config−if)# switchport !−−− This command is required if the interface is in L3 mode. it can not be assigned to a VLAN. to check the L2 interface status. Switch# show interface gigabitEthernet 3/1 switchport Name: Gi3/1 Switchport: Enabled Administrative Mode: dynamic auto Operational Mode: static access Administrative Trunking Encapsulation: negotiate Operational Trunking Encapsulation: native Negotiation of Trunking: On Access Mode VLAN: 2 (VLAN0002) Trunking Native Mode VLAN: 1 (default) Voice VLAN: none Administrative private−vlan host−association: none Administrative private−vlan mapping: none Administrative private−vlan trunk native VLAN: none Administrative private−vlan trunk encapsulation: dot1q Administrative private−vlan trunk normal VLANs: none Administrative private−vlan trunk private VLANs: none Operational private−vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2−1001 Cisco − Creating Ethernet VLANs on Catalyst Switches . Switch(config−if)# switchport access vlan 2 Switch(config−if)# no shutdown Issue the show interface gigabitEthernet module/interface switchport command. the port becomes active if it senses the presence of a physical link. Integrated Cisco IOS Software (Native Mode) interfaces are Layer 2 (L2) interfaces on Catalyst 3550. In Integrated Cisco IOS Software (Native Mode).! vlan 2000 ! interface GigabitEthernet1/1 ! interface GigabitEthernet1/2 ! !−−− Output suppressed. and they are L3 interfaces on Catalyst 6000/6500 series switches. and 4500 series switches. You can configure the interface as a L2 interface with the switchport command in interface configuration mode. In order to associate the ports to VLANs in Integrated Cisco IOS Software (Native Mode). interfaces are in the shutdown state by default. if the interface is in L3 mode. unlike in CatOS−based switches. In CatOS. This command must be entered prior to the assignment of a VLAN.

There is a way to change the Native VLAN on the interface that is trunking: the switchport trunk native vlan vlan_number command. and trunking VLAN information.1q trunking 1 Port Vlans allowed on trunk Gi3/1 1−4094 Port Vlans allowed and active in management domain Gi3/1 1−4. Be aware that an 802.2000. but the neighboring switch has Native VLAN 1. then the switchport trunk native vlan command is useful if the Native VLAN of the interface has been changed or needs to be changed from its defaults. Mismatch in Native VLANs can cause InterVLAN routing issues.3000 Port Vlans in spanning tree forwarding state and not pruned Gi3/1 none If you use the default configuration. Issue the show interfaces module/interface trunk command to see the Native VLAN. Switch# show interfaces gigabitEthernet 3/1 trunk Port Mode Encapsulation Status Native vlan Gi3/1 on 802. This message appears when the Native VLAN is mismatched on the two Cisco switches: %CDP−4−NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on GigabitEhernet1/1 (2).Capture Mode Disabled Capture VLANs Allowed: ALL Voice VLAN: none (Inactive) Appliance trust: none If the port is setup as a trunk (a port that can carry more than one VLAN). Native VLAN is set to 1. Ensure that the trunk ports on both of the connected devices have the same Native VLAN. among other things. Switch(config)# interface gigabitethernet 3/1 Switch(config−if)# switchport trunk native vlan 2 It can be verified with this command: Switch# show interfaces gigabitEthernet 3/1 trunk Port Mode Encapsulation Status Native vlan Gi3/1 on 802.2000. VLAN 1 becomes the Native VLAN by default. The Native VLAN is the one that is used if the interface will become a L2 interface. with D−R3550−9B GigabitEthernet0/1 (1) In that example message. the Native VLAN is 2 on one of the switches.1q trunking 2 Port Vlans allowed on trunk Gi3/1 1−4094 Port Vlans allowed and active in management domain Gi3/1 1−4.1Q header is not added when data is sent on the Native VLAN. encapsulation. If you do not explicitly define a Native VLAN.3000 Port Vlans in spanning tree forwarding state and not pruned Gi3/1 none Cisco − Creating Ethernet VLANs on Catalyst Switches .

suggestions. This same issue applies when you are copying configurations from a different switch or restoring configurations with VLANs that were created in VLAN database mode.. NetPro Discussion Forums − Featured Conversations Networking Professionals Connection is a forum for networking professionals to share questions. The featured links are some of the most recent conversations available in this technology.dat). However. in order for the SVI to be fully active (administratively up and line protocol up). Troubleshooting Tips This section provides troubleshooting tips for common problems that you might encounter while you are creating VLANs on Catalyst switches running Integrated Cisco IOS Software (Native Mode). and information about networking solutions. NetPro Discussion Forums − Featured Conversations for LAN Network Infrastructure: LAN Routing and Switching Network Infrastructure: Getting Started with LANs Cisco − Creating Ethernet VLANs on Catalyst Switches . Ensure that all previous VLANs that were created in VLAN database mode or global configuration mode still exist after the configuration is copied to the switch.) Switch# vlan database Switch(vlan)# no vlan 2 Deleting VLAN 2. SVI interfaces show as UP/DOWN in the show ip interface brief command. products. For an SVI to come up. you can issue the show vlan command to ensure that the VLAN has been deleted. When a Switch Virtual Interface (SVI) is created. At least one port should be a member of that VLAN and have an active device connected to it. and technologies. (This example uses the VLAN database mode to remove VLAN 2. On switches running Integrated Cisco IOS Software (Native Mode). or you must recreate the VLANs as shown in the previous procedure.Remove VLANs To remove a VLAN from the VLAN database. You must also replace the VLAN database file (vlan. Copying the configuration from another switch does not copy the VLAN database. the switch itself can be used for InterVLAN routing (instead of using an external router). when the configuration is applied to the switch. a VLAN has to be created in VLAN database mode or (in later Cisco IOS software releases) in global configuration mode. The global configuration mode does not log any message on the console that the VLAN has been deleted.. Switch(vlan)# apply APPLY completed. issue the no vlan vlan_number command in either VLAN database or global configuration mode. it does not automatically create a VLAN in the L2 database. If the L2 VLAN has not been created on the switch then.

5. Inc. Important Notices and Privacy Statement. 2005 Document ID: 10023 Cisco − Creating Ethernet VLANs on Catalyst Switches . All rights reserved.1Q Trunking on a Catalyst 2900XL/3500XL/2950 Switch Using an External Router • Cisco IOS Desktop Switching Command Reference • Index − Catalyst 6500 Series Command Reference.Related Information • Configuring InterVLAN Routing Using an Internal Router (Layer 3 Card) on Catalyst 5500/5000 and 6500/6000 Switches That Run CatOS System Software • Configuring InterVLAN Routing and ISL/802. Updated: Sep 02.5 • Understanding and Configuring VLAN Trunk Protocol (VTP) • LAN Product Support Pages • LAN Switching Support Page • Technical Support & Documentation − Cisco Systems All contents are Copyright © 1992−2005 Cisco Systems.