Cisco Systems OL-16447-01 manual Troubleshooting, Diagnosing Problems, Switch POST Results

C H A P T E R 4

Troubleshooting

•Diagnosing Problems, page 4-1

•Clearing the Switch IP Address and Configuration, page 4-4

•Finding the Switch Serial Number, page 4-5

Diagnosing Problems

The LEDs on the front panel provide troubleshooting information about the switch. They show power-on self-test (POST) failures, port-connectivity problems, and overall switch performance. You can also get statistics from the CLI or from an SNMP workstation. See the software configuration guide and the switch command reference on Cisco.com or the documentation that came with your SNMP application for more information.

Switch POST Results

As the switch powers on, it begins the POST, a series of tests that runs automatically to ensure that the switch functions properly. It might take several minutes for the switch to complete POST.

When the switch begins POST, the System LED blinks green, and the other LEDs remain solid green. When POST succeeds, the System LED becomes solid green. The other LEDs turn off and return to their operating status. If the switch fails POST, the System LED is solid amber.

You can use the show diagnostics post user EXEC command to display the POST results.

Note POST failures are usually serious. Contact your Cisco technical support representative if your switch does not pass POST.

Cisco ME 3400E Ethernet Access Switch Hardware Installation Guide

OL-16447-01 4-1