Chapter 5 Troubleshooting
Problem Solving to the System Component Level
Problem Solving to the System Component Level
The key to success when troubleshooting the system is to isolate the problem to a specific system component. Your first step is to compare what the system is doing to what it should be doing. Because a startup problem can usually be caused by a single component, it is more efficient to isolate the problem to a subsystem rather than troubleshoot each separate component in the system.
The switch consists of the following subsystems:
•Power supply—Includes the power supplies and power supply fans. If you suspect problems with the power supplies, see the “Troubleshooting the Power Supply” section on page 5-6.
•Fan assembly—The system fan assembly should be operating whenever system power is on. You should be able to hear the fan assembly when the system is operating. If you determine that the fan assembly is not operating, see the “Troubleshooting the Fan Assembly” section on page 5-8.
•Supervisor engine—The supervisor engine contains the operating system software, so check the supervisor engine if you have trouble with the system software. Status LEDs on the supervisor engine indicate whether the supervisor engine has initialized correctly. If there is a problem with the supervisor engine, try reseating the supervisor engine in the chassis and restarting the switch. For more information about LED meanings, refer to the “LEDs” section on page 1-27. If the supervisor engine does not boot correctly after reseating and restarting, contact Cisco TAC. See the “Contacting the Cisco Technical Assistance Center” section on page 5-16.
•Switching modules—The LEDs labeled STATUS on each switching module indicate whether the switching module has been initialized correctly. The supervisor engine must be operating properly before the switching module will initialize. If a switching module is improperly installed in the switch, it will not function, so if the supervisor engine is working but a switching module is not, try reseating the module. For more informations, see the “Troubleshooting Switching Modules” section on page 5-10. If you determine that the switching module is not operating, contact Cisco TAC as described in the “Contacting the Cisco Technical Assistance Center” section on page 5-16.
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