I have a 3550-24-PWR Switch with a half dozen IP phones connected. This morning I had a report that several phones connected to this switch just keep rebooting. I connected to the switch and have found the following in the logs:
1w3d: %ILPOWER-3-CONTROLLER_PORT_ERR: Controller port error, Interface Fa0/21: Power given, but Power Controller does not report Power Good
A reboot of the switch brings all the phones back up. What exactly causes this error and does it indicate a hardware or software/bug issue?