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Cisco CCNA Routing and Switching ICND2 200-101 Official Cert Guide by Wendell Odom

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Step 2: Isolate Interface Problems

A Cisco switch interface must be in a working state before the switch can process frames received on the interface or send frames out the interface. So, a somewhat obvious troubleshooting step should be to examine the state of each interface, specifically those expected to be used when forwarding frames, and verify that the interfaces are up and working.

This section examines the possible interface states on a Cisco IOS–based switch, lists root causes for the nonoperational states, and covers a popular problem that occurs even when the interface appears to be in a working state. The specific tasks for this step can be summarized with the following troubleshooting steps:

Step 2. Check for interface problems as ...

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