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CCNP Practical Studies: Troubleshooting by Donna L. Harrington

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Shooting Trouble with Switches

Shooting trouble with switches requires that you understand Physical and Data Link Layer targets and well as normal switch operations. A physical and logical map is not just something nice to have but a necessity in real-world operations. It is not easy to create if you don't understand how things work, in particular STP for Layer 2 devices. You must continue to follow a consistent methodology such as those suggested in the first part of the book to assist you in isolating fault domains.

It is probably not a bad idea to go back and review the Ethernet and switch beginning checklists and ending sections on shooting trouble. All of them allude to the fact that interfaces (ports) are the main Data Link Layer target. ...

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