CHAPTER
3-1
Cisco ME 2400 Ethernet Access Switch Hardware Installation Guide
OL-7678-01
3
Troubleshooting
The System and port 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 “LEDs” section on page 1-5.
You can also get statistics from the browser interface, from the command-line interface (CLI), or from a
Simple Network Management Protocol (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 describes these topics for troubleshooting problems:
• Understanding POST Results, page 3-1
• Diagnosing Problems, page 3-1
Understanding POST Results
When the switch powers on, it automatically begins the POST, a series of tests that verifies that the
switch functions properly. When the switch begins POST, the system LED slowly blinks green. When
POST completes, the system LED blinks amber. If POST fails, the system LED remains amber. If POST
completes successfully, the system LED rapidly blinks green.
Note POST failures are usually fatal. Call Cisco Systems if your switch does not pass POST.
Diagnosing Problems
Common switch problems fall into these categories:
• Poor performance
• No connectivity
• Corrupted software
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