CHAPTE R
3-1
Cisco IE 3000 Switch Hardware Installation Guide
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3
Troubleshooting
This chapter provides these topics for troubleshooting proble ms:
• Diagnosing Problems, page 3-1
• How to Clear the Switch IP Address and Configuration, page 3-5
• How to Recover Passwords, page 3-5
• Finding the Switch Serial Number, page 3-6

Diagnosing Problems

The LEDs on the front panel provide troubleshooting information about the sw itch. They show power-on
self-test (POST) failures, port-connectivity problems, and overall switch performance. You can also get
statistics from the browser interface, the command-line interface (CLI), the Cisco Intelligence
Engine 2100 (IE2100) Series Configuration Registrar, or a Simple Network Management Protocol
(SNMP) workstation. See the switch software configuration guide, the switc h command reference, or the
documentation that came with your IE2100 or SNMP application for details.

Verify Switch POST Results

As the switch powers on, it begins the 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.
POST starts with LED tests that cycles once through the System, Alarm, Setup, Pwr A, and Pwr B LEDs.
While POST proceeds, the System LED blinks green, and all the other LEDs remain off. If POST
completes successfully, the System LED changes to solid green, and the other LEDs display their normal
operating status. If the switch fails POST, the System LED turns red.
Note POST failures are usually fatal. Contact your Cisco technical support representative if your switch does
not pass POST.
If you have a terminal connected to the console port, you can also view POST status and test results on
the terminal. If the terminal displays garbled characters, you might need to reset the terminal-emulation
software to 9600 bits per second. For more information about viewing results on a terminal, see the
“Verify POST Results” section on page 2-22.