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The front-panel LEDs provide troubleshooting information about the switch. They show power-on self-test (POST) failures, port-connectivity problems, and overall switch performance. For a full description of the LEDs, see the "LEDs" section.
You can also get statistics from the Cluster Management Suite (CMS), the command-line interface (CLI), or a Simple Network Management Protocol (SNMP) workstation. Refer to the Catalyst 2950 Desktop Switch Software Configuration Guide, the Catalyst 2950 Desktop Switch Command Reference, or the documentation that came with your SNMP application for details.
This chapter provides these topics for troubleshooting problems:
While the switch powers on, it automatically begins POST, a series of tests that verifies that the switch functions properly. When the switch begins POST, the system LED is off. If POST completes successfully, the LED turns green. If POST fails, the LED turns amber.
Note POST failures are usually fatal. Call Cisco Systems if your switch does not pass POST. |
Common switch problems fall into these categories:
Table 3-1 describes how to detect and solve these problems.
Symptom | Possible Cause | Resolution |
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Refer to the Catalyst 2950 Desktop Switch Software Configuration Guide for information about identifying autonegotiation mismatches. | ||
Cabling distance exceeded.
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Bad adapter in attached device.
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Spanning Tree Protocol (STP) checking for possible loops. | Wait 30 seconds for port status LED to turn green. | |
Incorrect or bad cable. |
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No link at both ends. |
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Switch not recognizing a GBIC module. | Refer to your GBIC documentation for more information. | |
Unreadable characters on the management console. | Incorrect baud rate. | Reset the terminal-emulation software to 9600 baud. |
System LED is amber, and all port LEDs are off. | Corrupted software. | Attach a monitor to the serial port to display the switch boot loader. For more information, refer to the Catalyst 2950 Desktop Switch Software Configuration Guide. |
System LED is amber |
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Posted: Mon Dec 17 18:34:58 PST 2001
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