3-5
Catalyst 3550 Multilayer Switch Hardware Installation Guide
78-11358-01
Chapter 3 Troubleshooting
Diagnosing Problems
No connectivity. Incorrect or bad cable.
The following are results of no link
at both ends:
• A crossover cable was used
when a straight-through was
required, or vice-versa.
• The cable is wired incorrectly.
• STP checking for possible
loops.
• For the correct pinouts and
the proper application of
crossover vs.
straight-through cables, see
the “Crossover and
Straight-Through Cable
Pinouts” section on
page B-4.
• Replace with a tested good
cable.
• Wait 30 seconds for the port
LED to turn green.
Switch not recognizing a GBIC
module.
Refer to the your GBIC
documentation for more
information.
Unreadable characters on the
management console.
Incorrect baud rate. Reset the emulation software to
9600 baud.
System LED is amber on the
switch.
Nonfatal or fatal POST error
detected.
Use the CLI show POST
command to see which POST
test failed.
Table 3-2 Common Problems and Their Solutions (continued)
Symptom Possible Cause Resolution
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