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Diagnosing Problems
Table 4-1
Common Problems and Solutions
Symptom
Poor performance or excessive
errors
Catalyst 3750 Switch Hardware Installation Guide
4-4
Possible Cause
Duplex autonegotiation mismatch.
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 328 feet (100
meters).
If the switch is attached to a
–
repeater, the total distance
between the two end
stations exceeds the cabling
guidelines.
For SFP port connections:
•
The distance between the
–
SFP port and the attached
device exceeds the SFP
cabling guidelines.
Bad adapter in attached device
Excessive errors found in port
•
statistics.
STP checking for possible
•
loops.
Chapter 4
Troubleshooting
Resolution
Refer to the switch software
configuration guide for
information on identifying
autonegotiation mismatches.
Refer to the 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 SFP
•
documentation for cabling
guidelines.
Run adapter card diagnostic
•
utility.
Wait 30 seconds for the port
•
LED to turn green.
78-15136-02
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