|
The LEDs on the front panel of the Catalyst 2900 series XL switch 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 SNMP workstation. See the Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide, the Catalyst 2900 Series XL and Catalyst 3500 Series XL Command Reference, or the documentation that came with your SNMP application for details.
This chapter describes the following topics for troubleshooting problems:
Each time the switch is powered on, eight POSTs run automatically to check the most important system components before the switch begins forwarding packets. When the switch begins its POST, the port status LEDs turn amber for 2 seconds, and then they turn green. As each test runs, the port status LEDs turn off, starting with number 1x. The port status LEDs for ports 2x to 8x each turn off in turn as the system completes a test.
When the POST completes successfully, the port status LEDs go off, indicating that the switch is operational. If a test fails, the port status LED associated with the test turns amber, and the system LED turns amber. Table 3-1 lists the eight POST tests and their associated LEDs.
Note POST failures are usually fatal. Call Cisco Systems if your switch does not pass POST. |
Switch LED | Component Tested |
1 | DRAM |
2 | Flash memory |
3 | Switch CPU |
4 | System board |
5 | CPU interface ASIC |
6 | Switch core ASIC |
7 | Ethernet controller ASIC |
8 | Ethernet interfaces |
If you install modules WS-X2914-XL or WS-X2922-XL in a Catalyst 2924M XL or Catalyst 2912MF XL switch, the module fails POST. This failure occurs because the expansion modules support 2048 MAC addresses and the switch supports 8192 MAC addresses. To correct the failure, restart the switch with the module installed. After the restart, the address capacity of the switch is reduced to 2048 MAC addresses.
Common switch problems fall into the following categories:
Table 3-2 describes how to detect and resolve these problems.
Symptom | Possible Cause | Resolution |
---|---|---|
Poor Performance or Excessive Errors. | Duplex autonegotiation mismatch. | Refer to the Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide for information on identifying autonegotiation mismatches. |
Cabling distance exceeded.
|
| |
Bad adapter in attached device.
|
| |
No Connectivity. | Incorrect or bad cable. The following are indicated by no link at both ends:
|
|
Amber System LED. | Corrupted software. | Use the EXEC show POST command to see which POST test failed. |
Amber Expansion Slot LED. | Module not seated in expansion slot. | Tighten the thumb screws on the module front panel. |
Unreadable Characters on the Management Console. | Incorrect baud rate. | Reset the emulation software to 9600 baud. |
LRE LED not turned on. | Telephone cable loose or not connected properly. | Reseat phone cable into phone wall jack and Cisco 575 LRE. |
Telephone cable defective. | Replace telephone cable. | |
Cable trunking defective. | Repair cable trunking or select an alternative pair. | |
Cisco 575 LRECPE not communicating with or might be attempting to exceed bandwidth selected by the Catalyst 2900 LRE XL switch. | Verify switch and upstream network status.
| |
LRE status LED not turned on. | RJ-21 cable loose or not connected properly. | Reseat RJ-21 connector and fasten with screw or cable tie. |
Trunk cable defective. | Verify trunk cable, repair or use alternate pair. | |
CPE device absent, not powered, or defective. | Check CPE device, and refer to installation guide. | |
CPE device out of maximum range. | Consider modification to topology to shorten reach or improve wiring quality. | |
LRE status LED stays amber. | Trunk quality too poor to support desired profile. |
|
Excessive interference from other services in bundle. |
| |
Local nonstandard noise source. | Consult Cisco sales representative for installation optimization. | |
LRE link goes down when phone is taken off-hook, placed on-hook, rings, or dials. | Unfiltered phone tap on LRE line. |
|
Posted: Wed Feb 6 09:09:20 PST 2002
All contents are Copyright © 1992--2002 Cisco Systems, Inc. All rights reserved.
Important Notices and Privacy Statement.