WS-4748 ports not granting POE power

[kperry]

4510 switch with 4 WS-4748-UPOE cards and now 2 of those cards are not granting POE to Cisco 8851 phones. Plenty of power and these cards were granting power and have some phones on them. The issues just seems to be on cards 1 & 4. Cards 2 & 3 will grant power.

sw1#sho power det
Power Fan Inline
Supply Model No Type Status Sensor Status
------ ---------------- --------- ----------- ------- -------
PS1 PWR-C45-4200ACV AC 4200W good good good
PS1-1 220V good
PS1-2 220V good
PS2 PWR-C45-4200ACV AC 4200W good good good
PS2-1 220V good
PS2-2 220V good

Power supplies needed by system : 1
Power supplies currently available : 2

Power Summary Maximum
(in Watts) Used Available
---------------------- ---- ---------
System Power (12V) 786 1360
Inline Power (-50V) 942 3374
Backplane Power (3.3V) 40 40
---------------------- ---- ---------
Total 1768 (not to exceed Total Maximum Available = 4200)

Power Measurement Inline Power (-50V)
(in Watts) (+/- 50Watts)
------------------ -------------------
PS1 150
PS2 200
------------------ -------------------
Total 350

Power fail interrupts received on slot 1: 8
Power fail interrupts received on slot 2: 0

Debounce value for power fail status: 0 microseconds

Watts Used of System Power(12V)
Mod Model budgeted instantaneous peak out of reset in reset
---- ------------------- -------- ------------- ------ ------------ --------
1 WS-X4748-UPOE+E 55 31 31 55 35
2 WS-X4748-UPOE+E 55 31 32 55 35
3 WS-X4748-UPOE+E 55 31 31 55 35
4 WS-X4748-UPOE+E 55 30 31 55 35
5 WS-X45-SUP8-E 311 174 181 311 205
-- Fan Tray 255 -- -- -- --
------------------------- -------- ------------- ------ ------------ --------
Total 786 297 306 531 345

Watts used of Chassis Inline Power (-50V)
Inline Power Admin Inline Power Oper
Mod Model PS Device PS Device Efficiency
---- ------------------- ---------------- ---------------- ----------
1 WS-X4748-UPOE+E 186 176 59 56 95
2 WS-X4748-UPOE+E 311 295 90 85 95
3 WS-X4748-UPOE+E 221 210 66 63 95
4 WS-X4748-UPOE+E 225 214 61 58 95
5 WS-X45-SUP8-E - - - - -
------------------------- ---------------- ---------------- ----------
Total 943 895 276 262

sw1#sho power
Power Fan Inline
Supply Model No Type Status Sensor Status
------ ---------------- --------- ----------- ------- -------
PS1 PWR-C45-4200ACV AC 4200W good good good
PS1-1 220V good
PS1-2 220V good
PS2 PWR-C45-4200ACV AC 4200W good good good
PS2-1 220V good
PS2-2 220V good

Power supplies needed by system : 1
Power supplies currently available : 2

Power Summary Maximum
(in Watts) Used Available
---------------------- ---- ---------
System Power (12V) 786 1360
Inline Power (-50V) 942 3374
Backplane Power (3.3V) 40 40
---------------------- ---- ---------
Total 1768 (not to exceed Total Maximum Available = 4200)

Power Measurement Inline Power (-50V)
(in Watts) (+/- 50Watts)
------------------ -------------------
PS1 150
PS2 200
------------------ -------------------
Total 350

[Reza Sharifi]

Possibly a software bug that is causing this.  Take a look at the release notes for the version of the IOS you are running. You should also contact TAC for this.

HTH

[Leo Laohoo]

I'm agree with Reza: What IOS version is the chassis running on? I too suspect an IOS bug.
So the port won't power 8851? Only an 8851? How about other model of phones?

[Austin Sabio]

Typical PoE issues mostly are resolved with a reload unless the asic is bad then the switch needs to be replaced. Check the logs for poe messages to identify related bugs. 

I hope this helps and good luck!

- Austin 

[kperry]

I rebooted the switch after hours last night and the problem showed up again. But this time these two error messages immediately showed up in the log. I did not see these before as they may have occurred weeks or months past as the switch had been up over a year and only the past several days did we move phones around.
*Oct 11 03:34:56.193: %C4K_ETHPOE-4-SUPPLYFAULT: Module 1 POE controller has been shutdown because of excessive power usage.
*Oct 11 03:35:01.086: %C4K_ETHPOE-4-SUPPLYFAULT: Module 4 POE controller has been shutdown because of excessive power usage.
This morning I did a "hw-module slot 1 reset" on each card and that seems to have fixed the issue. Ports that were not providing POE are now working.
So it appears that if a POE device is connected when the above error occurs they continue to work but if you move a device or connect a new device they will not till a hw-module slot x reset is done.

[Austin Sabio · Accepted solution]

Indeed a quick fix is to reload the module or the whole switch. Issue symptoms are observed as you said new PoE won't be granted neither PoE changes will take effect. btw you are hitting CSCuz38242/CSCum48844. 

I hope this was helpful. Please don't forget to mark the correct/helpful answer to benefit others. 

-Austin