Chapter 3 Troubleshooting
Diagnosing Problems
3-2
Catalyst 3550 Multilayer Switch Hardware Installation Guide
78-11358-03
When POST completes successfully, the port LEDs return to the status mode
display, showing that the switch is operational. If a test fails, the port LED
associated with the test turns amber, and the system LED turns amber.
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
describes how to detect and resolve these problems.
Table 3-1
POST Test Descriptions
Switch LED
Component Tested
LED 1
DRAM
LED 2
Flash memory
LED 3
CPU interface buffer
LED 4
CPU interface ASIC
LED 5
Switch core ASIC
LED 6
TCAM
LED 7
Ethernet controller ASIC
LED 8
Ethernet interfaces