Cisco WS-C3750-24TS-E 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