Cisco 2431 - IAD Router Hardware Installation Manual page 54

Diagnosing Problems
Table 3-1
Table 3-1
Symptom
Poor performance or excessive
errors
Cisco ME 2400 Ethernet Access Switch Hardware Installation Guide
3-2
describes how to detect and resolve these problems.
Common Problems and Their Solutions
Possible Cause
Duplex autonegotiation mismatch.
Cabling distance exceeded
•
•
•
Port statistics show excessive
frame check sequence (FCS),
late-collision, or alignment
errors.
For 10/100BASE-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 cabling
guidelines.
For SFP module port
connections:
The distance between the
–
SFP module port and the
attached device exceeds the
SFP module cabling
guidelines.
Chapter 3 Troubleshooting
Resolution
See the switch software
configuration guide for
information on identifying
autonegotiation mismatches.
See the switch software
•
configuration guide for
information on displaying
port statistics.
Reduce the cable length to
•
within the recommended
distances.
See your repeater
•
documentation for cabling
guidelines.
• See your SFP module
documentation for cabling
guidelines.
OL-7678-01