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CHAPTER
3-1
Catalyst 3560 Switch Hardware Installation Guide
OL-6337-03
3
Troubleshooting
The 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 1-9.
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 power-on self test (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