C H A P T E R
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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
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, and the Catalyst 3550 Multilayer Switch Command Reference on
Cisco.com, or the documentation that came with your SNMP application for
details.
This chapter describes these topics for troubleshooting problems:
•
Understanding POST Results, page 3-1
•
Understanding POST Results
lists the eight POST tests and their associated LEDs.
POST tests run automatically each time the switch is powered on. When the
switch begins POST, the port LEDs turn green. The System LED flashes green,
and the RPS LED turns off. As each test runs, the port LEDs, starting with
number 1, turn off. The remaining port LEDs each turn off in sequence as the
system completes a test.
