Cisco Catalyst 2900 SERIES XL Hardware Installation Manual page 80

Diagnosing Problems
Table 3-2 Common Problems and Their Solutions
Symptom
Poor Performance or
Excessive Errors.
Catalyst 2900 Series XL Hardware Installation Guide
3-4
Possible Cause
Duplex autonegotiation mismatch.
Cabling distance exceeded.
• Port statistics show excessive frame
check sequence (FCS), late-collision,
or alignment errors.
For 100BASE-TX 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 100BASE-T cabling
guidelines.
For 10BASE-T connections: The
•
distance between the port and the
attached device exceeds 328 feet
(100 meters).
Bad adapter in attached device.
• Excessive errors found in port
statistics.
STP checking for possible loops.
•
Chapter 3 Troubleshooting
Resolution
Refer to the Catalyst 2900 Series
XL and Catalyst 3500 Series XL
Software Configuration Guide for
information on identifying
autonegotiation mismatches.
• Refer to the Catalyst 2900
Series XL and Catalyst 3500
Series XL Software
Configuration Guide for
information on displaying
port statistics.
Reduce the cable length to
•
within the recommended
distances.
Refer to your 100BASE-T
repeater documentation for
cabling guidelines.
• Reduce the cable length to
within the recommended
distances.
• Run adapter card diagnostic
utility.
Wait 30 seconds for LED to
•
turn green.
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