Cisco 2975 - Manual (Page 39)

C H A P T E R
3-1
Catalyst 2975 Switch Hardware Installation Guide
OL-17784-01
3
Troubleshooting
• 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
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. 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.
Switch POST Results
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.
Note POST failures are usually fatal. Contact your Cisco technical support representative if your switch does
not pass POST.
Switch LEDs
If you have physical access to the switch, look at the port LEDs for troubleshooting information about
the switch. See the
“LEDs” section on page 1-3 for a description of the LED colors and their meanings.