Cisco Catalyst 2950 Hardware Installation Manual page 133

Chapter 4 Troubleshooting
Table 4-1 Common Problems and Solutions
Symptom
Poor performance or
excessive errors.
78-11157-05
Table 4-1 describes how to detect and solve these problems.
Possible Cause
Duplex autonegotiation mismatch.
Cabling distance exceeded.
Port statistics show excessive
•
1
FCS , late-collision, or
alignment errors.
For 10BASE-T, 100BASE-TX,
•
and 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 GBIC
•
connections: The distance
between the GBIC module port
and the attached device exceeds
the GBIC cabling guidelines.
For SFP
•
connections: The distance
between the SFP module port
and the attached device exceeds
the SFP cabling guidelines.
2
module port
3
module port
Catalyst 2950 Desktop Switch Hardware Installation Guide
Diagnosing Problems
Resolution
Refer to the switch software
configuration guide for
information about identifying
autonegotiation mismatches.
Refer to the switch software
•
configuration guide for
information about
displaying port statistics.
• Reduce cable length to
within the recommended
distances.
Refer to your repeater
•
documentation for cabling
guidelines.
Refer to your GBIC module
•
documentation for cabling
guidelines.
See Table 2-2 on page 2-16
•
for SFP cabling guidelines.
4-3