CHAPTER 3
Troubleshooting
This chapter contains these topics:
•
Diagnosing Problems, page 35
•
Finding the Switch Serial Number, page 39
Diagnosing Problems
The LEDs on the front panel provide troubleshooting information about the switch. They show POST failures,
port-connectivity problems, and overall switch performance. You can also get statistics from Device Manager,
from the CLI, or from an SNMP workstation.
Switch POST Results
POST failures are usually fatal. Contact your Cisco technical support representative if your switch does
not pass POST.
Note
Switch LEDs
If you have physical access to the switch, look at the port LEDs for troubleshooting information about the
switch. See the LED section for a description of the LED colors and their meanings.
Switch Connections
Bad or Damaged Cable
Always examine the cable for marginal damage or failure. A cable might be just good enough to connect at
the physical layer, but it could corrupt packets as a result of subtle damage to the wiring or connectors. You
Cisco Catalyst 2960-L Series 24-Port and 48-Port Switch Hardware Installation Guide
35
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