Chapter 4 Troubleshooting
Diagnosing Problems
4-4
Catalyst 3750 Switch Hardware Installation Guide
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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. For a full description of the switch LEDs, see the “LEDs” section
on page 2-13.
You can also get statistics from the browser interface, from the CLI, or from an
SNMP workstation. Refer to the software configuration guide, the switch
command reference guide on Cisco.com, or the documentation that came with
your SNMP application for details.
You can access the Technical Support Website
(http://www.cisco.com/techsupport) for a list of known hardware problems and
extensive troubleshooting documentation including:
• Field notices
• Security advisories
• Troubleshooting resources
• Factory defaults
• Password recovery
• Recovery from corrupted or missing software
• Switch port problems
• Network interface cards
• Troubleshooting tools
Common switch problems fall into these categories:
• Poor performance
• No connectivity
• Corrupted software
Table 4-1 describes how to detect and resolve these problems.
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