Cisco Catalyst 6840 Series Operating instructions
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, on page 1
•Solving Problems at the System Component Level, on page 1
•Identifying Startup Problems, on page 2
•Troubleshooting the Power Supply, on page 2
•Troubleshooting the Fan Tray , on page 3
•Status LED Indicators, on page 4
•Contacting Cisco Customer Service, on page 4
•Finding the Serial Number, on page 5
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.
Troubleshooting
1
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.
Troubleshooting
2
Troubleshooting
Identifying Startup Problems
• 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, on page 4.
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, on page 4 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.
Troubleshooting
3
Troubleshooting
Troubleshooting the Fan Tray
Status LED Indicators
ActionComponentAlarm TypeStatus LED
Indication
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.
Chassis temperature sensor
exceeds major threshold.
MajorRed
Syslog message and SNMP trap
generated.
Monitor the condition.
Chassis temperature sensor
exceeds minor threshold.
MinorOrange
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.
Redundant supervisor engine
temperature sensor exceeds
major or minor threshold.
Major
Minor
Red
Orange
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
Troubleshooting
4
Troubleshooting
Status LED Indicators
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
Troubleshooting
5
Troubleshooting
Finding the Serial Number
Troubleshooting
6
Troubleshooting
Finding the Serial Number
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