CHAPTER
3-1
Catalyst 3550 Multilayer Switch Hardware Installation Guide
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3
Troubleshooting
The LEDs on the front panel provide troubleshooting information about the
switch. They show failures in the power-on self-test (POST), port-connectivity
problems, and overall switch performance. For a full description of the switch
LEDs, see the “LEDs” section on page 1-5.
You can also get statistics from the browser interface, from the command-line
interface (CLI), or from a Simple Network Management Protocol (SNMP)
workstation. Refer to the Catalyst 3550 Multilayer Switch Software Configuration
Guide, the Catalyst 3550 Multilayer Switch Command Reference, or the
documentation that came with your SNMP application for details.
This chapter describes these topics for troubleshooting problems:
• Understanding POST Results, page 3-2
• Diagnosing Problems, page 3-3
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