Physical connectivity issues
The switch may not function properly due to connectivity issues arising due to physical faults such as damaged cables, loose connections.
The switch LEDs help diagnose the issue. They show boot fast failures, port-connectivity problems, and overall switch performance. You can also get statistics from Device Manager, the CLI, or an SNMP workstation.
A port LED that is lights up does not guarantee that the cable is functional. It might have encountered physical stress, causing it to function at a marginal level. If the port LED does not turn on:
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Check for loose connections. Sometimes a cable appears to be seated but is not. Disconnect the cable, and then reconnect it.
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Check for broken or missing pins on cable connectors..
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Ensure correct cable type is used.
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Ensure that both devices have power.
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Ensure that both ends of the cable are connected to the correct ports.
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Connect the cable from the switch to a known good device.