Installation guide

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Catalyst 3550 Multilayer Switch Hardware Installation Guide

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Chapter 4 Troubleshooting

Diagnosing Problems

The LEDs on the front panel provide troubleshooting information about the

switch. They show POST failures, port-connectivity problems, and overall switch

performance. For a full description of the switch LEDs, see the “LEDs” section

on page 2-9.

You can also get statistics from the browser interface, from the CLI, or from an

SNMP workstation. Refer to the software configuration guide and the switch

command reference guide on Cisco.com or the documentation that came with

your SNMP application for details.

You can access the Cisco Technical Support website for a list of known hardware

problems and extensive troubleshooting documentation:

• Field notices

• Security advisories

• Troubleshooting resources

• Factory defaults

• Password recovery

• Recovery from corrupted or missing software

• Switch port problems

• Network interface cards

• Troubleshooting tools