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Lab – Troubleshooting EtherChannel

Topology

Addressing Table

Device Interface IP Address Subnet Mask

S1 VLAN 99 192.168.1.11 255.255.255.0
S2 VLAN 99 192.168.1.12 255.255.255.0
S3 VLAN 99 192.168.1.13 255.255.255.0
PC-A NIC 192.168.0.2 255.255.255.0
PC-C NIC 192.168.0.3 255.255.255.0

VLAN Assignments

VLAN Name

10 User
99 Management

Objectives
Part 1: Build the Network and Load Device Configurations
Part 2: Troubleshoot EtherChannel

Background / Scenario
The switches at your company were configured by an inexperienced network administrator. Several errors in
the configuration have resulted in speed and connectivity issues. Your manager has asked you to

© 2013 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public. Page 1 of 7

Other switches and Cisco IOS versions can be used. All rights reserved. the network administrator decided to use Cisco’s PAgP on all port channels configured with EtherChannel. Load the following configurations into the appropriate switch. g0/1-2 shutdown exit enable secret class no ip domain lookup line vty 0 15 password cisco login line con 0 password cisco logging synchronous login exit © 2013 Cisco and/or its affiliates. the commands available and output produced might vary from what is shown in the labs. The password for console and vty access is cisco. Depending on the model and Cisco IOS version. or XP with a terminal emulation program. such as Tera Term)  Console cables to configure the Cisco IOS devices via the console ports  Ethernet cables as shown in the topology Part 1: Build the Network and Load Device Configurations In Part 1. and that all hosts are reachable. Step 2: Configure the PC hosts. Page 2 of 7 . This document is Cisco Public. find and correct the errors. configure basic settings on the PC hosts. and load configurations on the switches. Ensure that all of the EtherChannels use Port Aggregation Protocol (PAgP). Using your knowledge of EtherChannel and standard testing methods. As all switches are Cisco devices. If you are unsure. you will set up the network topology. Note: The switches used are Cisco Catalyst 2960s with Cisco IOS Release 15. Note: Make sure that the switches have been erased and have no startup configurations. Switch S2 is the root bridge for all VLANs in the topology. Required Resources  3 Switches (Cisco 2960 with Cisco IOS Release 15. Step 3: Erase the startup and VLAN configurations and reload the switches. Switch S1 Configuration: hostname S1 interface range f0/1-24. contact your instructor. The privileged EXEC password is class. Step 1: Cable the network as shown in the topology. Vista. All switches have the same passwords.0(2) lanbasek9 image or comparable)  2 PCs (Windows 7.Lab – Troubleshooting EtherChannel troubleshoot and correct the configuration errors and document your work.0(2) (lanbasek9 image). Step 4: Load switch configurations.

Page 3 of 7 .168.255.11 255. All rights reserved.Lab – Troubleshooting EtherChannel vlan 10 name User vlan 99 Name Management interface range f0/1-2 switchport mode trunk channel-group 1 mode active switchport trunk native vlan 99 no shutdown interface range f0/3-4 channel-group 2 mode desirable switchport trunk native vlan 99 no shutdown interface f0/6 switchport mode access switchport access vlan 10 no shutdown interface vlan 99 ip address 192.10. This document is Cisco Public. g0/1-2 shutdown exit enable secret class no ip domain lookup line vty 0 15 password cisco login line con 0 password cisco logging synchronous login exit vlan 10 name User vlan 99 name Management spanning-tree vlan 1.1.0 interface port-channel 1 switchport trunk native vlan 99 switchport mode trunk interface port-channel 2 switchport trunk native vlan 99 switchport mode access Switch S2 Configuration: hostname S2 interface range f0/1-24.255.99 root primary © 2013 Cisco and/or its affiliates.

g0/1-2 shutdown exit enable secret class no ip domain lookup line vty 0 15 password cisco login line con 0 password cisco logging synchronous login exit vlan 10 name User vlan 99 name Management interface range f0/1-2 interface range f0/3-4 switchport mode trunk channel-group 3 mode desirable switchport trunk native vlan 99 no shutdown interface f0/18 switchport mode access © 2013 Cisco and/or its affiliates.Lab – Troubleshooting EtherChannel interface range f0/1-2 switchport mode trunk channel-group 1 mode desirable switchport trunk native vlan 99 no shutdown interface range f0/3-4 switchport mode trunk channel-group 3 mode desirable switchport trunk native vlan 99 interface vlan 99 ip address 192.10.12 255. All rights reserved.255.99 interface port-channel 3 switchport trunk native vlan 99 switchport trunk allowed vlan 1.1. This document is Cisco Public.255.168.0 interface port-channel 1 switchport trunk native vlan 99 switchport trunk allowed vlan 1. Page 4 of 7 .99 switchport mode trunk Switch S3 Configuration: hostname S3 interface range f0/1-24.

255. you must examine the configurations on all switches. Based on the output. Step 1: Troubleshoot S1. Step 2: Troubleshoot S2. and the interfaces are in use. All rights reserved. c. Use the show interfaces trunk command to verify that the port channels are functioning as trunk ports. Use the show interfaces trunk command to verify trunk settings. Record the command used in the space provided below. and verify full functionality. e.13 255. This document is Cisco Public.Lab – Troubleshooting EtherChannel switchport access vlan 10 no shutdown interface vlan 99 ip address 192.0 interface port-channel 3 switchport trunk native vlan 99 switchport mode trunk Step 5: Save your configuration. make corrections if needed. Use the show etherchannel summary command to verify that interfaces are configured in the correct port channel. © 2013 Cisco and/or its affiliates. Issue the command to verify that the port channels are functioning as trunk ports. the proper protocol is configured. d.1. Do port channels 1 and 2 appear as trunked ports? b. Use the show etherchannel summary command to verify that the port channels are up and in use. Part 2: Troubleshoot EtherChannel In Part 2. Use the command show run | begin interface Port-channel command to view the running configuration beginning with the first port channel interface.168. f. a.255. record them in the space provided below. Record the commands used to correct the configurations. Resolve all problems found in the outputs from the previous show commands. a. Page 5 of 7 . are there any EtherChannel issues? If issues are found.

Based on the output. c. d. Issue the command to verify that the interfaces are configured in the correct port channel and that the proper protocol is configured. Based on the output. a. record them in the space provided below. Use the command show run | begin interface Port-channel command to view the running configuration beginning with the first port channel interface. b. record them in the space provided below. Resolve all problems found in the outputs from the previous show commands. Step 3: Troubleshoot S3. f. © 2013 Cisco and/or its affiliates. record them in the space provided below. Based on the output. are there any EtherChannel issues? If issues are found. Issue the command to verify that the port channels are functioning. b. Issue the command to verify that the port channels are functioning as trunk ports. c. Page 6 of 7 . are there any issues with the configurations? If issues are found.Lab – Troubleshooting EtherChannel Based on the output. record them in the space provided below. All rights reserved. are there any EtherChannel issues? If issues are found. Record the commands used to correct the configuration. Use the command show run | begin interface Port-channel to view the running configuration beginning with the first port-channel interface. Issue the command to verify trunk settings. are there any issues with the configurations? If issues are found. Remember that port channel issues can be caused by either end of the link. This document is Cisco Public. e. Issue the command to verify that interfaces are configured in the correct port channel and the proper protocol is configured.

Issue the command to verify that the port channels are functioning. All rights reserved.Lab – Troubleshooting EtherChannel d. Page 7 of 7 . Record the command used in the space provided below. Verify connectivity of the management VLAN. Issue the command to verify trunk settings. Note: It may be necessary to disable the PC firewall for pings between the PCs to succeed. This document is Cisco Public. or connectivity between hosts does not exist. Verify connectivity of PCs. Can PC-A ping PC-C? If EtherChannels are not fully functional. Step 4: Verify EtherChannel and Connectivity. Record the command used in the space provided below. b. a. Can S1 ping S2? Can S1 ping S3? Can S2 ping S3? c. e. Record the commands used to correct the configuration. Use the show interfaces etherchannel command to verify full functionality of the port channels. Resolve all problems found. © 2013 Cisco and/or its affiliates. f. Troubleshoot to resolve any remaining issues. connectivity between switches does not exist.