Chapter 3 Troubleshooting; Diagnosing Problems; Switch Post Results; Switch Leds - Cisco Catalyst 2975 Hardware Installation Manual

Cisco systems switch user manual

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Troubleshooting

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The LEDs on the front panel provide troubleshooting information about the switch. They show POST

failures, port-connectivity problems, and overall switch performance. You can also get statistics from the

device manager, from the CLI, or from an SNMP workstation. See the software configuration guide, the

switch command reference guide on Cisco.com, or the documentation that came with your SNMP

application for details.

As the switch powers on, it begins the power-on self-test (POST), a series of tests that runs automatically

to ensure that the switch functions properly. It might take several minutes for the switch to complete

POST.

When the switch begins POST, the switch status LEDs turn green. The System LED blinks green, and

the other LEDs remain solid green.

When POST completes successfully, the System LED stays green. The RPS LED stays green for some

time and then returns to its operating status. The other LEDs turn off and return to their operating status.

If the switch fails POST, the System LED is amber.

POST failures are usually fatal. Contact your Cisco technical support representative if your switch does

Note

not pass POST.

If you have physical access to the switch, look at the port LEDs for troubleshooting information about

the switch. See the

OL-17784-01

Diagnosing Problems, page 3-1

Clearing the Switch IP Address and Configuration, page 3-4

Finding the Switch Serial Number, page 3-5

Replacing a Failed Stack Member, page 3-6

"LEDs" section on page 1-3

C H A P T E R

for a description of the LED colors and their meanings.

Catalyst 2975 Switch Hardware Installation Guide

3-1

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