Friday, 22 December 2017

[Workaround and Fix] - Power given, but Power Controller does not report Power Good - Cisco 2960X Stack


If you hit this page, I think you have encountered an issue similar to what I have faced in my production environment yesterday. But still let me give you a brief about what I had seen so that you can compare it with your problem and apply the fix if needed.

Problem:-

Couple of PCs which were connected to our access layer switch WS-C2960X-48LPS-L were continuously flapping. It was not the link flap, but a POE related flap. Look at the strange alerts on the interfaces,

%ILPOWER-3-CONTROLLER_PORT_ERR: Controller port error, Interface Gi1/0/32: Power given, but Power Controller does not report Power Good
%ILPOWER-7-DETECT: Interface Gi1/0/32: Power Device detected: IEEE PD
%ILPOWER-5-POWER_GRANTED: Interface Gi1/0/32: Power granted
%ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/32: PD removed
%ILPOWER-7-DETECT: Interface Gi1/0/32: Power Device detected: IEEE PD

Solution:-

This just kept happening again and again. Though the device doesn't need POE, it appeared to be related to POE negotiation. So as a workaround I just disabled POE on the interface using below command after which the alerts just disappeared.

Switch(config-if)int g1/0/32
Switch(config-if)#power inline never
And when we checked with Cisco for the solution, they said it is a hardware fault and raised RMA for the device. 

I hope this piece of information was useful for you.

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2 comments:

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  2. Thank you for sharing you're findings. We have also seen the same behavior on WS-C3650-48PS running 03.07.05.E (152-3.E5). We noticed the port shows faulty on "show power inline". Usually means RMA the switch for us. Just like you noted, disabling PoE on the switch port disables the alarm. We also verified the LAN drop was a laptop. It was not connected to the VOIP phones ethernet port using PoE, Just straight to the Krone block and on to the switch port. The tech verified he cleared the cabling.

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