The LEDs on the front panel provide troubleshooting information about the switch. They show failures in the power-on self-test (POST), port-connectivity problems, and overall switch performance. For a full description of the switch LEDs, see the "LEDs" section.
You can also get statistics from the browser interface, from the command-line interface (CLI), or from a Simple Network Management Protocol (SNMP) workstation. Refer to thesoftware configuration guide, the switch command reference guide on Cisco.com, or the documentation that came with your SNMP application for details.
This chapter describes these topics for troubleshooting problems:
As the switch powers on, it begins POST, a series of tests that runs automatically to ensure that the switch functions properly. When the switch begins POST, the System, RPS, Status, Duplex, and Speed LEDs turn green. The System LED blinks green, and the other LEDs are solid green.
When the POST completes successfully, the System LED remains green. The RPS LED remains green for some time and then reflects the RPS operating status. The other LEDs turn off and then reflect the switch operating status.
If a switch fails POST, the System LED turns solid amber. The RPS LED is either solid or blinking amber. The other LEDs are off.
Note POST failures are usually
fatal. Call Cisco Systems if your switch does not pass
POST.
Clearing the Switch IP Address and Configuration
If you have configured a new switch with a wrong IP address, or if all the switch LEDs start blinking when you are trying to enter Express Setup mode, you can clear the IP address that is configured on the switch.
Note This procedure clears the IP address and all configuration information stored on
the switch. Do not follow this procedure unless you want to completely
reconfigure the switch.
To clear the IP address and the switch configuration information, follow these steps:
Step 1 Press and hold the Mode button, as shown in Figure 1-4.
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.
Note These steps only work on a previously-configured switch.
The switch now behaves like an unconfigured switch. You can configure the switch by using Express Setup as described in these sections.
For 1000BASE-T connections, be sure to use a twisted four-pair, Category 5 cable.
Wait 30 seconds for the port LED to turn green.
Unreadable characters on the management console
Incorrect baud rate.
Reset the emulation software to 9600 baud.
Amber system LED
Fatal POST error detected.
Contact Cisco Systems.
The switch port is placed in error-disabled state after SFP is inserted
Bad or non-Cisco-approved SFP.
Remove the SFP module from the switch, and replace it with a Cisco-approved module. Use the errdisable recovery cause gbic-invalid global configuration command to verify the port status, and enter a time interval to recover from the error-disable state.
Refer to the switch command reference guide for information on the errdisable recovery command.
Switch does not recognize the SFP module
The SFP module might be installed upside down.
The SFP module does not snap into the slot.
Verify that the SFP module is not installed upside down.
Remove the SFP module. Inspect for physical damage to the connector, the module, and the module slot.
Replace the SFP module with a known good SFP module.
