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3-3
Catalyst 3550 Multilayer Switch Hardware Installation Guide
78-11358-03
Chapter 3 Troubleshooting
Diagnosing Problems
Table 3-2
Common Problems and Their Solutions
Symptom
Possible Cause
Resolution
Poor performance or excessive
errors
Duplex autonegotiation mismatch.
Refer to the Catalyst 3550
Multilayer Switch Software
Configuration Guide for
information on identifying
autonegotiation mismatches.
Cabling distance exceeded
•
Port statistics show excessive
frame check sequence (FCS),
late-collision, or alignment
errors.
•
For 10/100 and
10/100/1000BASE-T
connections:
–
The distance between the
port and the attached device
exceeds 100 meters.
–
If the switch is attached to a
repeater, the total distance
between the two end
stations exceeds the cabling
guidelines.
•
For GBIC port connections:
–
The distance between the
GBIC port and the attached
device exceeds the GBIC
cabling guidelines.
•
Refer to the Catalyst 3550
Multilayer Switch Software
Configuration Guide for
information on displaying
port statistics.
•
Reduce the cable length to
within the recommended
distances.
•
Refer to your repeater
documentation for cabling
guidelines.
•
Refer to your GBIC
documentation for cabling
guidelines.
Bad adapter in attached device
•
Excessive errors found in port
statistics.
•
STP checking for possible
loops.
•
Run adapter card diagnostic
utility.
•
Wait 30 seconds for the port
LED to turn green.