Cisco 2950 Hardware Installation Guide - Page 89

System LED is amber, and, all port LEDs are off. - fan replacement

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Chapter 3 Troubleshooting Diagnosing Problems Table 3-1 Common Problems and Solutions (continued) Symptom No connectivity. Unreadable characters on the management console. System LED is amber, and all port LEDs are off. System LED is amber. Possible Cause Incorrect or bad cable. No link at both ends. • A crossover cable was used when a straight-through was required, or the reverse. • The cable is wired incorrectly. • STP checking for possible loops. Switch not recognizing a GBIC module. Switch not recognizing an SFP module. Incorrect baud rate. Corrupted software. • Internal fan fault detected. • Nonfatal or fatal POST error detected. Resolution • For the correct pinouts and the proper application of crossover vs. straight-through cables, see the "Cable and Adapter Specifications" section on page B-6. • Replace it with a tested good cable. • Wait 30 seconds for port status LED to turn green. Refer to your GBIC module documentation for more information. Refer to your SFP module documentation for more information. Reset the terminal-emulation software to 9600 baud. Attach a monitor to the serial port to display the switch boot loader. For more information, see the switch software configuration guide. • Check if the fan has failed by using the show env fan privileged EXEC command. If the fan has failed, call Cisco Systems. • Use the show post privileged EXEC command to see which POST test failed. OL-6156-01 Catalyst 2950 Switch Hardware Installation Guide 3-3

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3-3
Catalyst 2950 Switch Hardware Installation Guide
OL-6156-01
Chapter 3
Troubleshooting
Diagnosing Problems
No connectivity.
Incorrect or bad cable.
No link at both ends.
•
A crossover cable was used
when a straight-through was
required, or the reverse.
•
For the correct pinouts and
the proper application of
crossover vs.
straight-through cables, see
the
“
Cable and Adapter
Specifications
”
section on
page B-6
.
•
The cable is wired incorrectly.
•
Replace it with a tested
good cable.
•
STP checking for possible
loops.
•
Wait 30 seconds for port
status LED to turn green.
Switch not recognizing a GBIC
module.
Refer to your GBIC module
documentation for more
information.
Switch not recognizing an
SFP module.
Refer to your SFP module
documentation for more
information.
Unreadable characters on
the management console.
Incorrect baud rate.
Reset the terminal-emulation
software to 9600 baud.
System LED is amber, and
all port LEDs are off.
Corrupted software.
Attach a monitor to the serial
port to display the switch boot
loader. For more information,
see the
switch software
configuration guide.
System LED is amber.
•
Internal fan fault detected.
•
Check if the fan has failed
by using the
show
env fan
privileged EXEC command.
If the fan has failed, call
Cisco Systems.
•
Nonfatal or fatal POST error
detected.
•
Use the
show post
privileged EXEC command
to see which POST test
failed.
Table 3-1
Common Problems and Solutions (continued)
Symptom
Possible Cause
Resolution