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New Member

WCS error alarm

I am getting the following error

Access point 'AP' associated with controller 'WISM1-b' draws low power from Ethernet. Failure reason: 'The AP draws 15.4 watts from Ethernet'

So is this saying that the AP is supposed to draw 15.4 and is not getting enough juice?

7 REPLIES
New Member

Re: WCS error alarm

What kind of AP you got?

Do yopu use Power injector or switch with PoE?

1252 with two radios enabled need about 20 W

15.4 W it is maxium power that you can get from standard PoE device, To use maxium power for 1252 you have to use special power injector or 3560E switches.

Second thing, I ve got same error but after update frimware on controller error disappear,

Third thing, enable CDP on switch and then check, of course if you use switches.

New Member

Re: WCS error alarm

This is an 1140 AP, so it doesn't require anything over 15.4 watts.  This is over PoE on a 4500.  I am running 6.0.182 on my controllers.

Here is the CDP power output.

Duplex: full
Power drawn: 15.400 Watts
Power request id: 64001, Power management id: 2
Power request levels are:15400 14500 0 0 0
Management address(es):

The weird thing is that this is only happening on like 2 out of 100+ 1140's.  They all have the same code and they are drawing 15.4 watts as they should so I don't know why the alarm is being generated.  My WCS version is 6.0.170.0

New Member

Re: WCS error alarm

I get this alarm also. I have been told to run debug on the controller the ap is running on but I have not done that yet because we are testing other issues. We are running ver 6.0.132.0 on our wcs and ver 6.0.188.0 on our controllers. we are using Power inj. (inj3 & inj4) on the 1252, 1242, and 1142.

Cisco Employee

Re: WCS error alarm

I'm wondering if it is this bug:


CSCsz53825 WLC shows medium power for AP1250 even when switch provides 20W


It seems to be showing up in the 6.0.188.0 code but has been around awhile.

New Member

Re: WCS error alarm

If it is this bug, I am seeing it on 1140s as well.  Also, I wonder if 6.0.196 is the fix for it.

New Member

Re: WCS error alarm

Well , I've update one of my controller to .196 and now I've got Full mixed mode on almost every AP, on few I ve got Normal or 15,4 W

Normal is on this AP where I don't use both radios, Now I am trying to explain this 15,4 W. It is hard to say where is a problem

Some Cdp entries on switch look like this : ( no matter is this 15,4 W or full mixed)

Device ID: xxxx
Entry address(es):
  IP address: xxxx
Platform: cisco AIR-LAP1252AG-E-K9  ,  Capabilities: Trans-Bridge
Interface: GigabitEthernet0/2,  Port ID (outgoing port): GigabitEthernet0
Holdtime : 160 sec

Version :
Cisco IOS Software, C1250 Software (C1250-K9W8-M), Version 12.4(21a)JHA, RELEASE                                 SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Thu 11-Feb-10 12:41 by prod_rel_team

advertisement version: 2
Duplex: full
Power drawn: 15.400 Watts
Power request id: 21796, Power management id: 0
Power request levels are:20000 16800 15400 11000 0
Management address(es):

Some look like this (these all have Full mixed always)

Device ID: xxxx
Entry address(es):
  IP address: xxxx
Platform: cisco AIR-LAP1252AG-E-K9  ,  Capabilities: Trans-Bridge
Interface: GigabitEthernet0/2,  Port ID (outgoing port): GigabitEthernet0
Holdtime : 160 sec

Version :
Cisco IOS Software, C1250 Software (C1250-K9W8-M), Version 12.4(21a)JHA, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Thu 11-Feb-10 12:41 by prod_rel_team

advertisement version: 2
Duplex: full
Power drawn: 20.000 Watts
Power request id: 6727, Power management id: 1
Power request levels are:20000 16800 15400 11000 0
Management address(es):

Of course all ports are configure in: power inline port maximum 20000

All switches has the same software version and are connected to one controller

Now I am trying to figure out what make such diffrences, maybe power level of radios? Maybe even cable length

New Member

Re: WCS error alarm

Did anyone ever get this issue resolved?

I have a similar issue in that I get the same alarm on my WCS on some APs but not others!

I use all 3750 PoE switches and all 1140 APs so all I need is 15.4w of juice over the Ethernet

My WCS version is 7.0.164.0

My WLCs are 4400s and are part of the same Mobility Group and the APs in question are all hanging off the same WCS

S/W Version is 6.0.182.0 on both Controllers

Any help with this would be much appreciated.  I don't believe it is causing clients any issues but would like to get to the bottom of it

Thanks in advance,

David

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