Cisco WS-C3750X-24T-L Hardware Installation Guide - Page 114

Symptom, Possible Cause, Resolution, Table 4-1, Common Problems and Solutions

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Diagnosing Problems Chapter 4 Troubleshooting Table 4-1 Common Problems and Solutions Symptom Poor performance or excessive errors Possible Cause Duplex autonegotiation mismatch. Cabling distance exceeded • Port statistics show excessive frame check sequence (FCS), late-collision, or alignment errors. Resolution Refer to the switch software configuration guide for information on identifying autonegotiation mismatches. • Refer to the switch software configuration guide for information on displaying port statistics. • For 10/100 and 10/100/1000BASE-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 SFP port connections: - The distance between the SFP port and the attached device exceeds the SFP cabling guidelines. Bad adapter in attached device • Excessive errors found in port statistics. • STP checking for possible loops. • Reduce the cable length to within the recommended distances. • Refer to your repeater documentation for cabling guidelines. • Refer to your SFP documentation for cabling guidelines. • Run adapter card diagnostic utility. • Wait 30 seconds for the port LED to turn green. Catalyst 3750 Switch Hardware Installation Guide 4-4 78-15136-02

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Chapter 4
Troubleshooting
Diagnosing Problems
4-4
Catalyst 3750 Switch Hardware Installation Guide
78-15136-02
Table 4-1
Common Problems and Solutions
Symptom
Possible Cause
Resolution
Poor performance or excessive
errors
Duplex autonegotiation mismatch.
Refer to the switch 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 10/100 and
10/100/1000BASE-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 SFP port connections:
–
The distance between the
SFP port and the attached
device exceeds the SFP
cabling guidelines.
•
Refer to the switch software
configuration guide for
information on displaying
port statistics.
•
Reduce the cable length to
within the recommended
distances.
•
Refer to your repeater
documentation for cabling
guidelines.
•
Refer to your SFP
documentation for cabling
guidelines.
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 the port
LED to turn green.