Cisco Systems Cisco ME 3400E Troubleshooting

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Cisco ME 3400E Ethernet Access Switch Hardware Installation Guide
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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.