Cisco 2950 Hardware Installation Guide - Page 88

Symptom, Possible Cause, Resolution, Poor performance or, excessive errors.

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Page 88 highlights

Diagnosing Problems Chapter 3 Troubleshooting Table 3-1 Common Problems and Solutions Symptom Poor performance or excessive errors. Poor performance or excessive errors (continued). Possible Cause Resolution Duplex autonegotiation mismatch. See the switch software configuration guide for information about identifying autonegotiation mismatches. Cabling distance exceeded. • Port statistics show excessive FCS,1 late-collision, or alignment errors. • See the switch software configuration guide for information about displaying port statistics. • For 10BASE-T, 100BASE-TX, and 1000BASE-T connections: - The distance between the port and the attached device exceeds 328 feet (100 meters). • Reduce cable length to within the recommended distances. - If the switch is attached to a repeater, the total distance between the two end stations exceeds the cabling guidelines. • Refer to your repeater documentation for cabling guidelines. • For GBIC module port connections: The distance between the GBIC module port and the attached device exceeds the GBIC cabling guidelines. • Refer to your GBIC module documentation for cabling guidelines. • For SFP module port connections: The distance between the SFP module port and the attached device exceeds the SFP cabling guidelines. • See Table 1-2 on page 1-12 for SFP cabling guidelines. Bad adapter in attached device. • Excessive errors found in port statistics. STP2 checking for possible loops. • Run adapter card diagnostic utility. Wait 30 seconds for port status LED to turn green. Catalyst 2950 Switch Hardware Installation Guide 3-2 OL-6156-01

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3-2
Catalyst 2950 Switch Hardware Installation Guide
OL-6156-01
Chapter 3
Troubleshooting
Diagnosing Problems
Table 3-1
Common Problems and Solutions
Symptom
Possible Cause
Resolution
Poor performance or
excessive errors.
Duplex autonegotiation mismatch.
See the switch software
configuration guide for
information about identifying
autonegotiation mismatches.
Cabling distance exceeded.
•
Port statistics show excessive
FCS,
1
late-collision, or
alignment errors.
•
See the switch software
configuration guide for
information about
displaying port statistics.
•
For 10BASE-T, 100BASE-TX,
and 1000BASE-T connections:
–
The distance between the
port and the attached device
exceeds 328 feet
(100 meters).
•
Reduce cable length to
within the recommended
distances.
–
If the switch is attached to a
repeater, the total distance
between the two end
stations exceeds the cabling
guidelines.
•
Refer to your repeater
documentation for cabling
guidelines.
•
For GBIC module port
connections: The distance
between the GBIC module port
and the attached device exceeds
the GBIC cabling guidelines.
•
Refer to your GBIC module
documentation for cabling
guidelines.
•
For SFP module port
connections: The distance
between the SFP module port
and the attached device exceeds
the SFP cabling guidelines.
•
See
Table 1-2 on page 1-12
for SFP cabling guidelines.
Poor performance or
excessive errors
(continued).
Bad adapter in attached device.
•
Excessive errors found in port
statistics.
•
Run adapter card diagnostic
utility.
STP
2
checking for possible loops.
Wait 30 seconds for port status
LED to turn green.