Cisco Systems OL-7469-04 General Problem Solving, Troubleshooting the Power and Cooling Systems

Appendix B Troubleshooting

General Problem Solving

General Problem Solving

As you start your problem solving, you first look at the way your Catalyst 6500 switch or Cisco 7600 router is responding during power up. The key to problem solving is to isolate the problem to a specific subsystem by comparing what your switch or router is doing to what it should be doing.

The LEDs on the front panel of the switch or router enable you to determine the switch or router performance and operation. For a description of these LEDs, refer to the following books:

•Catalyst 6500 Series Switch Installation Guide—Appendix E

•Cisco 7600 Series Router Installation Guide—Chapter 4 When problem solving, consider the following:

•Power and cooling systems—Power LEDs, external power source, power cable, power supply and circuit breaker, and blower and fan. Also consider inadequate ventilation or air circulation.

•Modules—LEDs on the modules help identify a failure (see the “Front-Panel Features” section on page 1-3for details about the MWAM STATUS LED).

•Cables—External cables that connect the router to the network.

Troubleshooting the Power and Cooling Systems

In your Catalyst 6500 switch or Cisco 7600 router, both the power LED and the fans can help you troubleshoot a power problem. The following items will help you isolate the problem (refer to the “Troubleshooting the Power Supply” section in Appendix E, “Troubleshooting” of the Catalyst 6500 Series Switch Installation Guide or the “Troubleshooting the Power Supply” section in Chapter 4, “Troubleshooting” of the Cisco 7600 Series Router Installation Guide for details):

Check the following items to help isolate problems with the power supply installation:

•With the Catalyst 6500 switch or Cisco 7600 router connected to the power source, is the power LED on the front panel on?

–If not, check the DC input, DC source, and the power supply wiring.

–Check the power supply connection to the motherboard.

–If the power LED is still off, the problem might be a power supply failure.

•Does the Catalyst 6500 switch or Cisco 7600 router shut down after being on a short time?

–Check the fans. If the fans are not working, the switch or router will overheat and shut itself down.

–If the fans are not working, check the power supply connections to the fans.

–Ensure that the chassis intake and exhaust vents are clear.

Check the environmental site requirements in the:

–Catalyst 6500 Series Switch Installation Guide—Chapter 2

–Cisco 7600 Series Router Installation Guide—Chapter 2

•Does the switch or router partially boot, but the LEDs do not go on?

–Check for a power supply failure by inspecting the power LED on the front panel of the switch or router. If the power LED is on, the power supply is functional.

–If the power LED is not on, refer to the Cisco Information Packet for warranty information or contact customer service.

Multiprocessor WAN Application Module User Guide

B-2 OL-7469-04