Installation guide

Chapter3 Troubleshooting
Diagnosing Problems
3-4
Catalyst 3500 Series XL Hardware Installation Guide
78-6456-03
Table 3-2 Common Problems and Their Solutions
Symptom Possible Cause Resolution
Poor performance or excessive
errors.
Duplex autonegotiation mismatch. See the Cisco IOS Desktop
Switching 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 100BaseTX 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
100BaseT cabling
guidelines.
• For 10BaseT connections: The
distance between the port and
the attached device exceeds 100
meters.
• See the Cisco IOS Desktop
Switching Software
Configuration Guide for
information on displaying
port statistics.
• Reduce the cable length to
within the recommended
distances.
Seeyour 100BaseTrepeater
documentation for cabling
guidelines.
• Reduce the cable length to
within the recommended
distances.
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 LED to
turn green.