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CCNA Data Center DCICN 640-911 Official Cert Guide by Chad Hintz, Wendell Odom

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Troubleshooting EtherChannel

EtherChannels can prove particularly challenging to troubleshoot for a couple of reasons. First, you have to be careful to match the correct configuration, and there are many more incorrect configuration combinations than there are correct combinations. Second, many interface settings must match on the physical links, both on the local switch and on the neighboring switch, before a switch will add the physical link to the channel. This last topic in the chapter works through both sets of issues.

Incorrect Options on the channel-group Command

Earlier, the section titled “Configuring EtherChannel” listed the small set of working configuration options on the channel-group command. Those rules can be summarized as follows, ...

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