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Using LEDs to Identify Startup Problems
Using LEDs to Identify Startup Problems
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. All system 
states in the startup sequence are indicated by LEDs. By checking the LEDs, you can determine when 
and where the system...

  
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System Messages
St e p 5If the boot information and system banner are not displayed, verify that the terminal is set for 9600 baud, 
8 data bits, no parity, and 1 stop bit and connected properly to the console port. 
System Messages
System messages appear on the console if you have enabled console logging or appear in the syslog if 
you have enabled syslog. Many messages are for informational purposes...

  
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Troubleshooting the Power Supply
St e p 5If the LED labeled GOOD 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. See the “System Messages and Power 
Problems” section on page 5-5. You may need to replace the power supply.
St e p 6If the LED labeled FAN OK fails to light when the switch is connected to a good power...

  
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Troubleshooting the Fan Assembly
Useful CLI Commands
You may also use the show environment status powersupply, show module all, and show power 
commands to monitor PS status, load, and activity.
If the show module command output shows a message that states not enough power for module, check 
Appendix A, “Power Supply Specifications,” for the minimum power requirements for the power supply. 
There may be a...

  
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Troubleshooting Backplane Modules
St e p 8If the system is still detecting a fan assembly failure, check for details using the CLI and contact the 
Cisco TAC for assistance. 
System Messages and Fan Problems
Look for system messages reporting a temperature problem or problem with the fans. Individual 
messages may suggest different solutions. Connect a terminal to the console port, and look for any of...

  
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Troubleshooting Switching Modules
•The output-fail LED on the power supplies are red and no power is delivered to the chassis. The 
other LEDs on the power supply are green.
•The Status LEDs on the switching modules and the supervisor engine are flashing green. 
•CPU Utilization LEDs are flashing green or off.
If you observe these conditions, contact the Cisco TAC for assistance in ordering replacement...

  
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Troubleshooting Switching Modules
System Messages and Switching Modules 
Connect a terminal to the console port, and look for any of the following system messages:
C4K_CHASSIS-3-LINECARDMUXBUFFERTOSUPALIGNMENTWRONG
C4K_CHASSIS-3-LINECARDNOTVALIDINSLOT
C4K_CHASSIS-3-MODULENOTSUPPORTHALF
C4K_IOSINTF-5-STALEPHYPORT
C4K_IOSMODPORTMAN-4-INLINEPOWEROVERMAX
If you see any of these messages or other messages, go...

  
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Troubleshooting Supervisor Engines
Troubleshooting Supervisor Engines
This section only addresses problems with hardware. Problems with features or configuration are not 
covered here. Refer for your software configuration guide and release notes for information on 
configuring features or identifying known problems.
Ta b l e 5 - 2 describes the supervisor engine LEDs. Check the LEDs on your supervisor...

  
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Troubleshooting Supervisor Engines
System Messages and Supervisor Engines 
Connect a terminal to the console port, and look for any of the following system messages:
C4K_CHASSIS-3-LINECARDMUXBUFFERTOSUPALIGNMENTWRONG
C4K_SUPERVISOR-3-MUXBUFFERREADSUPERVISORSELECTIONFAILED
C4K_CHASSIS-3-TEMPERATURESENSORREADFAILED
C4K_HW-3-X2IDENTIFICATIONFAILURE
C4K_HW-3-X2OUIREGREADFAILURE...

  
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Chapter 5      Troubleshooting
Troubleshooting Supervisor Engines
Problems with redundant supervisor systems are often due to mismatched active and standby supervisor 
engines. Redundancy requires that both supervisor engines be the same model, have the same amount of 
SDRAM memory and running the same Cisco IOS release. If one supervisor has a NetFlow service card, 
the other must as well.
Some problems with supervisor engines are...