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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

Note: The switches used are Cisco Catalyst 2960s with Cisco IOS Release 15. Depending on the model and Cisco IOS version. the commands available and output produced might vary from what is shown in the labs. Ensure that all of the EtherChannels use Port Aggregation Protocol (PAgP). Load the following configurations into the appropriate switch. This document is Cisco Public. Step 4: Load switch configurations. and load configurations on the switches.Lab – Troubleshooting EtherChannel troubleshoot and correct the configuration errors and document your work. Page 2 of 7 . Using your knowledge of EtherChannel and standard testing methods. find and correct the errors. Required Resources  3 Switches (Cisco 2960 with Cisco IOS Release 15. Vista. If you are unsure. the network administrator decided to use Cisco’s PAgP on all port channels configured with EtherChannel. you will set up the network topology. Note: Make sure that the switches have been erased and have no startup configurations. Step 2: Configure the PC hosts. 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 1.0(2) (lanbasek9 image). All rights reserved. contact your instructor. As all switches are Cisco devices. Step 3: Erase the startup and VLAN configurations and reload the switches. Other switches and Cisco IOS versions can be used. configure basic settings on the PC hosts. All switches have the same passwords. The password for console and vty access is cisco. Step 1: Cable the network as shown in the topology. or XP with a terminal emulation program. 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. Switch S1 Configuration: hostname S1 interface range f0/1-24. The privileged EXEC password is class. and that all hosts are reachable. Switch S2 is the root bridge for all VLANs in the topology.0(2) lanbasek9 image or comparable)  2 PCs (Windows 7.

10.11 255.255.255.0 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 f0/1-24.1. Page 3 of 7 . All rights reserved. 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. This document is Cisco Public.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 192.168.99 root primary © 2013 Cisco and/or its affiliates.

255.99 switchport mode trunk Switch S3 Configuration: hostname S3 interface range f0/1-24.0 interface port-channel 1 switchport trunk native vlan 99 switchport trunk allowed vlan 1.10.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 192.1.255. 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.168. This document is Cisco Public.99 interface port-channel 3 switchport trunk native vlan 99 switchport trunk allowed vlan 1.12 255. Page 4 of 7 . All rights reserved.

Record the commands used to correct the configurations. d. Use the command show run | begin interface Port-channel command to view the running configuration beginning with the first port channel interface. make corrections if needed.13 255. Use the show interfaces trunk command to verify trunk settings. This document is Cisco Public. Use the show etherchannel summary command to verify that interfaces are configured in the correct port channel. f. Use the show etherchannel summary command to verify that the port channels are up and in use. the proper protocol is configured. Resolve all problems found in the outputs from the previous show commands. and the interfaces are in use. Issue the command to verify that the port channels are functioning as trunk ports. are there any EtherChannel issues? If issues are found. Do port channels 1 and 2 appear as trunked ports? b. Part 2: Troubleshoot EtherChannel In Part 2. Use the show interfaces trunk command to verify that the port channels are functioning as trunk ports. record them in the space provided below.255. e. Step 2: Troubleshoot S2. a. All rights reserved.1. you must examine the configurations on all switches. c. Record the command used in the space provided below. and verify full functionality.Lab – Troubleshooting EtherChannel switchport access vlan 10 no shutdown interface vlan 99 ip address 192. Based on the output. Step 1: Troubleshoot S1.255. Page 5 of 7 .168. © 2013 Cisco and/or its affiliates. a.0 interface port-channel 3 switchport trunk native vlan 99 switchport mode trunk Step 5: Save your configuration.

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

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