Cisco Catalyst 2960 Software Configuration Manual page 918

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Troubleshooting Tables

Power Over Ethernet Troubleshooting Scenarios

Symptom or problem

No PoE on only one port.

Trouble is on only one switch port. PoE

and non-PoE devices do not work on this

port, but do on other ports.

Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE

Possible cause and solution

Verify that the powered device works on another PoE port.

Use the show run, show interface status, or show power inline detail user

EXEC commands to verify that the port is not shut down or error disabled.

Most switches turn off port power when the port is shut down, even

though the IEEE specifications make this optional.

Verify that the Ethernet cable from the powered device to the switch port is good:

Connect a known good non-PoE Ethernet device to the Ethernet cable, and make

sure that the powered device establishes a link and exchanges traffic with another

Verify that the total cable length from the switch front panel to the powered

device is not more than 100 meters.

Disconnect the Ethernet cable from the switch port. Use a short Ethernet cable to

connect a known good Ethernet device directly to this port on the switch front

panel (not on a patch panel). Verify that it can establish an Ethernet link and

exchange traffic with another host, or ping the port VLAN SVI. Next, connect a

powered device to this port, and verify that it powers on.

If a powered device does not power on when connected with a patch cord to the

switch port, compare the total number of connected powered devices to the switch

power budget (available PoE). Use the show inline power and show inline

power detail commands to verify the amount of available power.

Troubleshooting

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