Troubleshooting

Problems with the initial startup are often caused by a switching module that has become dislodged from the backplane or a power supply that has been disconnected from the power cord connector. Although temperature conditions above the maximum acceptable level rarely occur at initial startup, you might encounter these conditions during extended operation. Long-term monitoring functions also include independent reporting of DC-output voltage problems.

Getting Started

When the initial system startup is complete, verify the following:

  • Power supplies are supplying power to the system.

  • The fan tray assembly is operating.

  • System software boots successfully.

If one or more of the above conditions are not met, use the procedures described in this chapter to isolate and, if possible, resolve the problem. If all of the above conditions are met, and the hardware installation is complete, refer to your software release notes for hardware support information and software caveats.

Solving Problems at 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 these subsystems:

  • Power supplies

  • Fan tray assembly

    The chassis fan tray assembly should operate whenever system power is on. You should see the FAN LED turn green and hear the fan tray assembly operating. A amber FAN LED indicates that one or more fans in the fan tray assembly is not operating. You should immediately contact a Customer Service representative if the fan tray assembly is not functioning properly. There are no installation adjustments that you can make if the fan tray assembly does not function properly at initial startup.

Identifying Startup Problems

LEDs indicate all system states in the startup sequence. By checking the LEDs, you can determine when and where the system failed in the startup sequence.

Procedure

Step 1

Turn on the power supplies. You should immediately hear the system fan tray assembly begin to operate.

  • If you determine that the power supplies are functioning normally and that the fan tray assembly is faulty, contact a customer service representative.
Step 2

If the startup information and system banner do not display at startup, verify that the terminal is set correctly and that it is connected properly to the console port.

Troubleshooting the Power Supply

If the OK LED does not light after you turn on the power switch, follow these steps to isolate a power subsystem problem:

Procedure

Step 1

Verify that the OK LED on the power supply is green.

  • If the OK LED is green, the AC or DC source is good and the power supply is functional.

  • If the OK LED remains off, there might be a problem with the AC source, the DC source, or the power cable.

  • Turn off the power to the switch, connect the power cord to another power source if one is available, and turn on the power.

  • If the OK LED is green, the problem is the first power source.

  • If the OK LED fails to light after you connect the power supply to a new power source, replace the power cord, and turn on the switch.

  • If the OK LED then goes on, return the first power cord for replacement.

If this unit has more than one power cord, repeat Step 1 for each power supply.

If the OK LED still fails to light when the switch is connected to a different power source with a new power cord, the power supply is probably faulty.

If a second power supply is available, install it in the second power supply bay, and contact a customer service representative for further instructions.

Step 2

If you have a second power supply, repeat Step 1 for this power supply.

What to do next

If you are unable to resolve the problem or if you determine that either a power supply or backplane connector is faulty, see Contacting Cisco Customer Service.

Troubleshooting the Fan Tray

To isolate a fan tray problem, follow these steps:

Procedure

Step 1

Verify that the FAN LED on the fan tray is green.

If the FAN LED is not green, see Contacting Cisco Customer Service to determine whether or not the power subsystem is functioning properly.

Step 2

Check to determine if the FAN LED is amber. If the FAN LED is amber, the fan tray is not seated in the backplane or has malfunctioned.

Do the following:

  • To ensure that the fan tray is seated properly, loosen the captive installation screws, remove the fan tray, and reinstall it.

  • Tighten all captive installation screws, and then restart the system.

  • If the FAN LED is still amber, the system detects an individual fan failure. Contact a customer service representative for instructions.

Status LED Indicators

Status LED Indication Alarm Type Component Action

Red

Major

Chassis temperature sensor exceeds major threshold.

Syslog message and SNMP trap generated.

If redundancy is configured, the system switches to the redundant supervisor engine and the active supervisor engine shuts down.

If there is no redundancy and the overtemperature condition is not corrected, the system shuts down after 5 minutes.

Orange

Minor

Chassis temperature sensor exceeds minor threshold.

Syslog message and SNMP trap generated.

Monitor the condition.

Red

Orange

Major

Minor

Redundant supervisor engine temperature sensor exceeds major or minor threshold.

Syslog message and SNMP trap generated.

If major alarm and the overtemperature condition is not corrected, the system shuts down after 5 minutes.

If minor alarm, monitor the condition.

Contacting Cisco Customer Service

If you are unable to solve a startup problem after using the troubleshooting suggestions in this chapter, contact a Cisco customer service representative for assistance and additional instructions. Before you call, have the following information ready to help your service provider assist you as quickly as possible:

  • Date on which you received the switch

  • Chassis serial number

  • Type of software and release number

  • Maintenance agreement or warranty information

  • Brief description of the problem

  • Brief explanation of the steps you have already taken to isolate and resolve the problem

Finding the Serial Number

If you contact Cisco Technical Assistance, you need to know the switch serial number. The figure shows where the serial number is located. You can also use the show version privileged EXEC command to see the serial number.

Figure 1. Serial Number on the Chassis