Chapter 5 Troubleshooting
Diagnosing Problems
Table
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| Common Problems and Solutions |
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Table |
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Symptom |
| Possible Cause | Resolution |
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Poor performance or | Duplex autonegotiation mismatch. | See the switch software |
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excessive errors. |
| configuration guide for |
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| information about identifying |
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| autonegotiation mismatches. |
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| Cabling distance exceeded. |
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| • Port statistics show excessive | • See the switch software |
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| frame check sequence (FCS), | configuration guide for |
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| information about |
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| errors. | displaying port statistics. |
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| • For |
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| and |
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| – The distance between the | • Reduce cable length to |
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| port and the attached device | within the recommended |
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| exceeds 328 feet | distances. |
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| (100 meters). |
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| • For 100 and 1000 speed |
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| connections: |
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| – Wrong cable type (not | • Replace wrong cable type |
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| Cat 5) attached to device | with Cat 5 cable. |
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| and switch |
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| – If the switch is attached to a | • See your repeater |
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| repeater, the total distance | documentation for cabling |
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| between the two end | guidelines. |
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| stations exceeds the cabling |
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| guidelines. |
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| Bad adapter in attached device. |
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| • Excessive errors found in port | • Run adapter card diagnostic |
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| statistics. | utility. |
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| Spanning Tree Protocol (STP) | Wait 30 seconds for port status |
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| checking for possible loops. | LED to turn green. |
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| Catalyst 2955 Hardware Installation Guide |
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