A issue the command to verify that interfaces are

a. Issue the command to verify that interfaces are configured in the correct port channel and the proper
protocol is configured.
Based on the output, are there any EtherChannel issues? If issues are found, record them in the space
provided below.
b. Use the command show run | begin interface Port-channel to view the running configuration beginning
with the first port-channel interface.
c. Resolve all problems found in the outputs from the previous show commands. Record the commands
used to correct the configuration.
S2(config)# interface range f0/3-4
S2(config-if-range)# no shutdown
S2(config-if-range)# exit
S2(config)# interface port-channel 1
S2(config-if)# switchport trunk allowed vlan 1,10,99
d. Issue the command to verify trunk settings.
e. Issue the command to verify that the port channels are functioning. Remember that port channel issues
can be caused by either end of the link.
Step 3: Troubleshoot S3.
a. Issue the command to verify that the port channels are functioning as trunk ports.
Based on the output, are there any issues with the configurations? If issues are found, record them in the
space provided below.
Port Channel 2 is not present in the output.
b. 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, are there any EtherChannel issues? If issues are found, record them in the space
provided below.
c. Use the command show run | begin interface Port-channel command to view the running configuration
beginning with the first port channel interface.
d. Resolve all problems found. Record the commands used to correct the configuration.
S3(config)# interface range f0/3-4
S3(config-if-range)# channel-group 2 mode desirable
S3(config-if-range)# interface range f0/1-2
S3(config-if-range)# switchport mode trunk
© 2013 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public. Page 6 of 7

Lab – Troubleshooting EtherChannel
S3(config-if-range)# switchport trunk native vlan 99
S3(config-if-range)# channel-group 3 mode desirable
S3(config-if-range)# no shutdown
e. Issue the command to verify trunk settings. Record the command used in the space provided below.
f. Issue the command to verify that the port channels are functioning. Record the command used in the
space provided below.
Step 4: Verify EtherChannel and Connectivity.
a. Use the show interfaces etherchannel command to verify full functionality of the port channels.
b. Verify connectivity of the management VLAN.
Can S1 ping S2? Yes
Can S1 ping S3? Yes
Can S2 ping S3? Yes
c. Verify connectivity of PCs.
Can PC-A ping PC-C? Yes
If EtherChannels are not fully functional, connectivity between switches does not exist, or connectivity
between hosts does not exist. Troubleshoot to resolve any remaining issues.
Note : It may be necessary to disable the PC firewall for pings between the PCs to succeed.
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