Cisco Systems 4900M Identifying Startup Problems, Problem Solving to the System Component Level

Chapter 4 Troubleshooting the Installation

Problem Solving to the System Component Level

•System software boots successfully.

If all of these conditions are met and the hardware installation is complete, refer to the software configuration guide and the command reference publications to troubleshoot the software. However, if any of these conditions are not met, use the procedures in this chapter to isolate and, if possible, resolve the problem.

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. The first step is to compare what the system is doing to what it should be doing. Because a startup problem can usually be attributed to 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 supply and power supply cooling. (See the “Troubleshooting the Power Supply” section on page 4-5.)

•Fan assembly system—The chassis fan assembly should operate whenever system power is on. Usually, it continues to operate even when the environmental monitor shuts down the system because of an overtemperature or overvoltage condition. (It will shut down for a power supply shutdown.) You should be able to hear the fan assembly to determine whether or not it is operating. If the FAN LED is orange and you determine that the fan assembly is not operating, you should immediately contact a customer service representative. There are no installation adjustments that you can make if the fan assembly does not function properly at the initial startup.

Identifying Startup Problems

When you connect the power cords to the Catalyst 4900M switch, follow these steps:

Step 1 Flip the power switches to the on position (AC powered systems only).

Step 2 Verify that power is available to the power supplied from the site AC or DC source. Flip breakers and fuses if necessary.

	Cisco Catalyst 4900M Switch Installation Guide
4-2	78-18350-01