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Troubleshooting
The front-panel LEDs provide troubleshooting information about the switch. They show power-on
self-test (POST) failures, port-connectivity problems, and overall switch performance. For a full
description of the LEDs, see the
You can also get statistics from the device manager, the Network Assistant application, the CLI, the
Cisco Intelligence Engine 2100 (IE2100) Series Configuration Registrar, or a SNMP workstation. See
the switch software configuration guide, the switch command reference, or the documentation that came
with your IE2100 or SNMP application for details.
This chapter provides these topics for troubleshooting problems:
•
•
Understanding POST Results
When the switch powers on, it automatically begins POST, a series of tests that verifies that the switch
functions properly. When the switch begins POST, the system LED is off. POST has completed
successfully when the SYST and STAT LEDs are green.
POST failures are usually fatal. Call Cisco Systems if your switch does not pass POST.
Note
Diagnosing Problems
Common switch problems fall into these categories:
•
•
•
Table 3-1
OL-6156-01
Understanding POST Results, page 3-1
Diagnosing Problems, page 3-1
Poor performance
No connectivity
Corrupted software
describes how to detect and solve these problems.
"LEDs" section on page
1-13.
Catalyst 2950 Switch Hardware Installation Guide
C H A P T E R
3
3-1
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