Cisco Systems 3550 manual Diagnosing Problems

Chapter 3 Troubleshooting

Diagnosing Problems

The switch LEDs begin blinking after about 2 seconds.

Note If the switch is not configured, the LEDs are all green. You can omit Step 2 and run Express Setup to configure the switch.

Step 2 Continue holding down the Mode button. The LEDs stop blinking after 8 additional seconds, and then the switch reboots.

The switch now behaves like an unconfigured switch. You can configure the switch by using Express Setup as described in the getting started guide. You can also configure the switch by using the command-line interface (CLI) setup procedure described in Appendix D, “Configuring the Switch with the CLI-Based Setup Program.”

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 1-6.

You can also get statistics from the browser interface, from the CLI, or from an SNMP workstation. See the software configuration guide and the switch command reference guide on Cisco.com or the documentation that came with your SNMP application for details.

You can access the Cisco Technical Support website for a list of known hardware problems and extensive troubleshooting documentation:

•Field notices

•Security advisories

•Troubleshooting resources

•Factory defaults

•Password recovery

•Recovery from corrupted or missing software

•Switch port problems

•Network interface cards

•Troubleshooting tools

Catalyst 3550 Switch Hardware Installation Guide

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