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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 an Simple Network Management Protocol (SNMP) workstation. See the Cisco IOS Desktop Switching Software Configuration Guide, the Cisco IOS Desktop Switching Command Reference (online only), or the documentation that came with your SNMP application for details.
This chapter describes the following topics for troubleshooting problems:
Table 3-1 lists the eight POST tests and their associated LEDs.
POST tests run automatically each time the switch is powered on. When the switch begins POST, the port LEDs turn amber for 2 seconds, and then they turn green. The System LED flashes green, and the RPS LED turns off. As each test runs, the port LEDs, starting with number 1, turn off. The port LEDs for ports 2 to 8 each turn off in turn as the system completes a test.
When POST completes successfully, the port LEDs return to the status mode display, indicating that the switch is operational. If a test fails, the port LED associated with the test turns amber, and the system LED turns amber.
Note POST failures are usually fatal. Call Cisco Systems if your switch does not pass POST. |
Switch LED | Component Tested |
LED 1 | DRAM |
LED 2 | Flash memory |
LED 3 | Switch CPU |
LED 4 | System board |
LED 5 | CPU interface ASIC |
LED 6 | Switch core ASIC |
LED 7 | Ethernet controller ASIC |
LED 8 | Ethernet interfaces |
Common switch problems fall into the following categories:
Table 3-2 describes how to detect and resolve these problems.
Symptom | Possible Cause | Resolution |
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Poor performance or excessive errors. | Duplex autonegotiation mismatch. | See the Cisco IOS Desktop Switching Software Configuration Guide for information on identifying autonegotiation mismatches. |
Cabling distance exceeded.
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Bad adapter in attached device.
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No connectivity. | Incorrect or bad cable.
The following are indicated by no link at both ends:
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Unreadable characters on the management console. | Incorrect baud rate. | Reset the emulation software to 9600 baud. |
System LED is amber on the Catalyst 3508, 3512, or 3524 XL switch. | Nonfatal or fatal POST error detected. | Use the show POST command to see which POST test failed. |
System LED is amber on the Catalyst 3524-PWR XL. |
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Cisco IP Phone fails to power on when connected to a Catalyst 3524-PWR XL switch. | Improper cabling. | Make sure the switch is connected to the LAN-to-phone jack on the Cisco IP Phone. |
Posted: Thu May 18 16:19:30 PDT 2000
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