Cisco Catalyst 3550 Installation Manual page 95

Chapter 3 Troubleshooting
Table 3-2 Common Problems and Their Solutions
Symptom
Poor performance or excessive
errors
78-11358-03
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 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.
Bad adapter in attached device
• Excessive errors found in port
statistics.
• STP checking for possible
loops.
Catalyst 3550 Multilayer Switch Hardware Installation Guide
Diagnosing Problems
Resolution
Refer to the Catalyst 3550
Multilayer Switch Software
Configuration Guide for
information on identifying
autonegotiation mismatches.
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.
• Run adapter card diagnostic
utility.
• Wait 30 seconds for the port
LED to turn green.
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