![]() Use the show log privileged EXEC command to review alarms reported earlier by system messages. Step 2 Use the show env all, show interface status, and show power inline privileged EXEC commands to review power status if no powered device on any port can power on. Step 1 Use the show interface status privileged EXEC command to verify that the ports are not shut down and not error disabled. Confirm that nonpowered Ethernet devices can establish an Ethernet link on any port and that PoE devices do not power on. Verify that switch power budget can power the device.įollow these steps when there is no power on any port or a consecutive group of ports. Step 8 Use the show power inline and show power inline detail privileged EXEC commands to compare the number of connected powered devices against the switch power budget (available PoE). Next, connect a powered device to this port, and verify that it powers on. Verify that the device establishes an Ethernet link and exchanges traffic with another host, or ping the port VLAN SVI. Use a short Ethernet cable to connect a known good Ethernet device to this switch port (not at a patch panel). Step 7 Disconnect the Ethernet cable from the switch port. ![]() For more information, see the cable diagnostics section in the switch software configuration guide. Step 6 Verify that the total cable length from the switch front panel to the connected device (powered device) is not more than 100 meters. Connect a known good non-PoE Ethernet device to the Ethernet cable, and make sure that it establishes a link and exchanges traffic with another host. Step 5 Verify that the Ethernet cable from the phone to the switch port is good. Step 4 Use the show run and show power inline interface-id privileged EXEC command to verify that the power inline never interface configuration command is not configured on the port. Step 3 Use the show interface status privileged EXEC command to verify that the switch port is not error disabled. (Most Cisco switches turn off port power when the port shuts down.) Step 2 Use the show run and show interface status privileged EXEC commands to verify that the port is not shut down. ![]() Step 1 Verify that the powered device works on other ports and that the problem is only on one port. Confirm that PoE and Non-PoE devices do not work on this port but work on other ports. Follow these steps when the trouble is on only one switch port.
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