Cisco 1810W drawing 24.5W on Cisco 3650 PoE Switch

[jerrysafetynet]

Hello,

     I have a network with 350 Cisco 1810W access points that are connected to Cisco 3650 PoE switches.  I have noticed that the APs are drawing almost the full 30W per port.  I believe these APs should only be drawing 8 to 10W while in normal operation and I think they were when they were first installed. This is casing a problem now as the switches are hitting their limit on PoE budget.  These APs are being controlled by a WLC 5520 with 8.3.130 firmware.  I have tried to manually set the ports on the switch to only use 15.4W, but I get an error saying "power denied".  Any help with this would be great.   Thank you.

[Leo Laohoo]

Looks like CSCvj73077.

[jerrysafetynet]

Thank you for the info.  Unfortunately, when issuing that command and then doing a "show power inline" it's showing the operation state of the port as "power-deny".  The switches I'm using at 802.3at capable switches, not 802.3af.  Thanks again though for recommending. 

[Leo Laohoo]

Post the

---

@jerrysafetynet wrote:

doing a "show power inline" it's showing the operation state of the port as "power-deny".  

---

Post the complete output to the following commands: 

1.  sh power inline

2.  sh logs

[jerrysafetynet]

FLLCI-SW15-12#sh power inline

Module Available Used Remaining
(Watts) (Watts) (Watts)
------ --------- -------- ---------
1 775.0 759.8 15.2
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/1 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/2 auto off 0.0 n/a n/a 30.0
Gi1/0/3 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/4 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/5 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/6 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/7 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/8 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/9 auto power-deny 0.0 n/a n/a 30.0
Gi1/0/10 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/11 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/12 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/13 auto on 17.9 AIR-AP1832I-B-K9 4 30.0
Gi1/0/14 auto on 30.0 Ieee PD 4 30.0
Gi1/0/15 auto on 17.9 AIR-AP1832I-B-K9 4 30.0
Gi1/0/16 auto on 17.9 AIR-AP1832I-B-K9 4 30.0
Gi1/0/17 auto on 17.9 AIR-AP1832I-B-K9 4 30.0
Gi1/0/18 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/19 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/20 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/21 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/22 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/23 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/24 auto on 30.0 Ieee PD 4 30.0
Gi1/0/25 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/26 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/27 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/28 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/29 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/30 auto on 30.0 Ieee PD 4 30.0
Gi1/0/31 auto on 17.9 AIR-AP1832I-B-K9 4 30.0
Gi1/0/32 auto on 17.9 AIR-AP1832I-B-K9 4 30.0
Gi1/0/33 auto on 30.0 Ieee PD 4 30.0
Gi1/0/34 auto on 17.9 AIR-AP1832I-B-K9 4 30.0
Gi1/0/35 auto off 0.0 n/a n/a 30.0
Gi1/0/36 auto off 0.0 n/a n/a 30.0
Gi1/0/37 auto off 0.0 n/a n/a 30.0
Gi1/0/38 auto off 0.0 n/a n/a 30.0
Gi1/0/39 auto off 0.0 n/a n/a 30.0
Gi1/0/40 auto off 0.0 n/a n/a 30.0
Gi1/0/41 auto off 0.0 n/a n/a 30.0
Gi1/0/42 auto off 0.0 n/a n/a 30.0
Gi1/0/43 auto off 0.0 n/a n/a 30.0
Gi1/0/44 auto off 0.0 n/a n/a 30.0
Gi1/0/45 auto off 0.0 n/a n/a 30.0
Gi1/0/46 off off 0.0 n/a n/a 30.0
Gi1/0/47 off off 0.0 n/a n/a 30.0
Gi1/0/48 auto off 0.0 n/a n/a 30.0

Brief log -all entries are the same

May 18 11:11:20.105: %ILPOWER-5-DETECT: Interface Gi1/0/9: Power Device detected: IEEE PD
*May 18 11:11:20.108: %ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi1/0/9: inline power denied. Reason: insufficient power
*May 18 11:11:35.112: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/9: PD removed
*May 18 11:11:36.109: %ILPOWER-5-DETECT: Interface Gi1/0/9: Power Device detected: IEEE PD
*May 18 11:11:36.111: %ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi1/0/9: inline power denied. Reason: insufficient power
*May 18 11:11:51.122: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/9: PD removed
*May 18 11:11:52.114: %ILPOWER-5-DETECT: Interface Gi1/0/9: Power Device detected: IEEE PD
*May 18 11:11:52.117: %ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi1/0/9: inline power denied. Reason: insufficient power
*May 18 11:12:07.122: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/9: PD removed
*May 18 11:12:08.121: %ILPOWER-5-DETECT: Interface Gi1/0/9: Power Device detected: IEEE PD
*May 18 11:12:08.123: %ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi1/0/9: inline power denied. Reason: insufficient power
*May 18 11:12:23.128: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/9: PD removed
*May 18 11:12:24.134: %ILPOWER-5-DETECT: Interface Gi1/0/9: Power Device detected: IEEE PD
*May 18 11:12:24.137: %ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi1/0/9: inline power denied. Reason: insufficient power
*May 18 11:12:39.142: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/9: PD removed
*May 18 11:12:40.135: %ILPOWER-5-DETECT: Interface Gi1/0/9: Power Device detected: IEEE PD
*May 18 11:12:40.138: %ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi1/0/9: inline power denied. Reason: insufficient power

[jerrysafetynet]

Module Available Used Remaining
(Watts) (Watts) (Watts)
------ --------- -------- ---------
1 775.0 759.8 15.2
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/1 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/2 auto off 0.0 n/a n/a 30.0
Gi1/0/3 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/4 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/5 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/6 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/7 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/8 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/9 auto power-deny 0.0 n/a n/a 30.0
Gi1/0/10 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/11 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/12 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/13 auto on 17.9 AIR-AP1832I-B-K9 4 30.0
Gi1/0/14 auto on 30.0 Ieee PD 4 30.0
Gi1/0/15 auto on 17.9 AIR-AP1832I-B-K9 4 30.0
Gi1/0/16 auto on 17.9 AIR-AP1832I-B-K9 4 30.0
Gi1/0/17 auto on 17.9 AIR-AP1832I-B-K9 4 30.0
Gi1/0/18 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/19 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/20 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/21 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/22 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/23 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/24 auto on 30.0 Ieee PD 4 30.0
Gi1/0/25 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/26 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/27 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/28 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/29 auto on 24.5 AIR-AP1810W-B-K9 4 30.0
Gi1/0/30 auto on 30.0 Ieee PD 4 30.0
Gi1/0/31 auto on 17.9 AIR-AP1832I-B-K9 4 30.0
Gi1/0/32 auto on 17.9 AIR-AP1832I-B-K9 4 30.0
Gi1/0/33 auto on 30.0 Ieee PD 4 30.0
Gi1/0/34 auto on 17.9 AIR-AP1832I-B-K9 4 30.0
Gi1/0/35 auto off 0.0 n/a n/a 30.0
Gi1/0/36 auto off 0.0 n/a n/a 30.0
Gi1/0/37 auto off 0.0 n/a n/a 30.0
Gi1/0/38 auto off 0.0 n/a n/a 30.0
Gi1/0/39 auto off 0.0 n/a n/a 30.0
Gi1/0/40 auto off 0.0 n/a n/a 30.0
Gi1/0/41 auto off 0.0 n/a n/a 30.0
Gi1/0/42 auto off 0.0 n/a n/a 30.0
Gi1/0/43 auto off 0.0 n/a n/a 30.0
Gi1/0/44 auto off 0.0 n/a n/a 30.0
Gi1/0/45 auto off 0.0 n/a n/a 30.0
Gi1/0/46 off off 0.0 n/a n/a 30.0
Gi1/0/47 off off 0.0 n/a n/a 30.0
Gi1/0/48 auto off 0.0 n/a n/a 30.0

*May 18 10:15:00.832: %ILPOWER-5-DETECT: Interface Gi1/0/9: Power Device detected: IEEE PD
*May 18 10:15:00.834: %ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi1/0/9: inline power denied. Reason: insufficient power
*May 18 10:15:15.840: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/9: PD removed
*May 18 10:15:16.852: %ILPOWER-5-DETECT: Interface Gi1/0/9: Power Device detected: IEEE PD
*May 18 10:15:16.855: %ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi1/0/9: inline power denied. Reason: insufficient power
*May 18 10:15:31.862: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/9: PD removed
*May 18 10:15:33.136: %ILPOWER-5-DETECT: Interface Gi1/0/9: Power Device detected: IEEE PD
*May 18 10:15:33.139: %ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi1/0/9: inline power denied. Reason: insufficient power
*May 18 10:15:48.148: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/9: PD removed
*May 18 10:15:49.425: %ILPOWER-5-DETECT: Interface Gi1/0/9: Power Device detected: IEEE PD
*May 18 10:15:49.428: %ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi1/0/9: inline power denied. Reason: insufficient power
*May 18 10:16:04.433: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/9: PD removed
*May 18 10:16:05.157: %ILPOWER-5-DETECT: Interface Gi1/0/9: Power Device detected: IEEE PD
*May 18 10:16:05.159: %ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi1/0/9: inline power denied. Reason: insufficient power
*May 18 10:16:20.165: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/9: PD removed
*May 18 10:16:21.167: %ILPOWER-5-DETECT: Interface Gi1/0/9: Power Device detected: IEEE PD
*May 18 10:16:21.170: %ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi1/0/9: inline power denied. Reason: insufficient power
*May 18 10:16:36.176: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/9: PD removed
*May 18 10:16:37.163: %ILPOWER-5-DETECT: Interface Gi1/0/9: Power Device detected: IEEE PD
*May 18 10:16:37.165: %ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi1/0/9: inline power denied. Reason: insufficient power
*May 18 10:16:52.174: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/9: PD removed
*May 18 10:16:53.161: %ILPOWER-5-DETECT: Interface Gi1/0/9: Power Device detected: IEEE PD
*May 18 10:16:53.166: %ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi1/0/9: inline power denied. Reason: insufficient power
*May 18 10:17:08.174: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/9: PD removed
*May 18 10:17:09.163: %ILPOWER-5-DETECT: Interface Gi1/0/9: Power Device detected: IEEE PD
*May 18 10:17:09.165: %ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi1/0/9: inline power denied. Reason: insufficient power
*May 18 10:17:24.172: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/9: PD removed
*May 18 10:17:25.175: %ILPOWER-5-DETECT: Interface Gi1/0/9: Power Device detected: IEEE PD
*May 18 10:17:25.178: %ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi1/0/9: inline power denied. Reason: insufficient power
*May 18 10:17:40.186: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/9: PD removed
*May 18 10:17:41.171: %ILPOWER-5-DETECT: Interface Gi1/0/9: Power Device detected: IEEE PD
*May 18 10:17:41.174: %ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi1/0/9: inline power denied. Reason: insufficient power
*May 18 10:17:56.180: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/9: PD removed
*May 18 10:17:57.177: %ILPOWER-5-DETECT: Interface Gi1/0/9: Power Device detected: IEEE PD
*May 18 10:17:57.180: %ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi1/0/9: inline power denied. Reason: insufficient power
*May 18 10:18:12.186: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/9: PD removed

[Rich R]

3. also "show cdp neigh detail"

This is how one of mine looks:
Device ID: <APNAME>
Entry address(es):
IP address: a.b.c.d
IPv6 address: ............. (link-local)
Platform: cisco AIR-AP1810W-E-K9, Capabilities: Router Trans-Bridge
Interface: GigabitEthernet1/0/14, Port ID (outgoing port): GigabitEthernet0
Holdtime : 179 sec

Version :
Cisco AP Software, ap1g4-k9w8 Version: 8.5.171.0
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 2014-2015 by Cisco Systems, Inc.

advertisement version: 2
Duplex: full
Power drawn: 14.200 Watts
Power request id: 60312, Power management id: 4
Power request levels are:14200 0 0 0 0
Management address(es):
IP address: a.b.c.d

So that definitely looks like a bug.  You can try disabling USB ports for a start (not even sure if that is an option on 1810W) and make sure PoE on LAN ports is disabled.

Presume you realise 8.3.130.0 is very old.  If you're forced to run 8.3 for some reason (old APs?) then at least get onto the latest release 8.3.150.x Escalation: https://www.cisco.com/c/en/us/support/docs/wireless/wireless-lan-controller-software/200046-tac-recommended-aireos.html#anc14 and better still at least 8.5.171.0 (definitely works correctly as above) or 8.10.151.0.

[jerrysafetynet]

Mine is a little different.  The power draw and the requested level is 24.500 Watts.  I do realize that 8.3 is old but with no support on it for now, we are stuck with it as I can't get the latest code.

Device ID: FLLCI-AP197-12
Entry address(es):
IP address: x.x.x.x
Platform: cisco AIR-AP1810W-B-K9, Capabilities: Router Trans-Bridge
Interface: GigabitEthernet1/0/5, Port ID (outgoing port): GigabitEthernet0
Holdtime : 152 sec

Version :
Cisco AP Software, ap1g4-k9w8 Version: 8.3.130.0
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 2014-2015 by Cisco Systems, Inc.

advertisement version: 2
Duplex: full
Power drawn: 24.500 Watts
Power request id: 4710, Power management id: 2
Power request levels are:24500 15400 0 0 0
Management address(es):
IP address: x.x.x.x

[Rich R]

Did you check that you've disabled USB (if it's an option although I don't think it is) but definitely that you've disabled PoE on the LAN ports or better still disable the LAN ports if you aren't using them?

And that CDP output shows that it will operate on 15400 so have you tried "power inline static max 15400" on your switchports (we use that in some cases for other APs where we have constraints on power budget)?

[jerrysafetynet]

These APs do not have a USB port.  We have disabled the LAN ports on some of the APs and they are drawing the same power as the APs with the LAN ports enabled (24.5W).  We have tried the "power inline static mac 15400" command but that results in an error message saying "power denied", when doing a "show power inline"

thanks

[Rich R]

It sounds like you're hitting a bug and your only option is to get the software upgraded but using the static port config (max not mac btw) *should* work but trying to do it on one non-working port when all the power is already consumed is completely pointless - you're not freeing up any power.

If you're referring to "inline power denied. Reason: insufficient power" then that's TELLING you there isn't enough unallocated power to service the request.  You'd need to apply the config to all the ports then reload the APs (use interface range command to shut, then configure power then no shut all the ports at once) because the power negotiation is done at boot time.  Then there should be enough power to serve all the APs with 15.4W.

The 1832s will also work 100% on 15.4W - they automatically disable the USB port (at least on current release) otherwise you could manually disable the USB ports.  (we use the static power config for 1832s extensively).

[Leo Laohoo]

---

@jerrysafetynet wrote:

Module Available  Used    Remaining
        (Watts)  (Watts)   (Watts)
------ --------- -------- ---------
1       775.0     759.8     15.2

---

Look at the output to the "sh power inline".    Power "allowance" shows 15.2w left and the AP requires >15.2w. 
This is why it is "denied".

[Rich R]

Exactly Leo - I've tried to explain that above ...

[Leo Laohoo]

---

@Rich R wrote:

Exactly Leo - I've tried to explain that above ...

---

Some people look at "badges" to our names. 

[jerrysafetynet]

I did try disabling ports 1 thru 10 on the switch and that freed up plenty of power but when setting the port to 15400 or any other wattage I'm still getting the "Power Deny" error

Module Available Used Remaining
(Watts) (Watts) (Watts)
------ --------- -------- ---------
1 775.0 603.7 171.3
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/1 off off 0.0 n/a n/a 30.0
Gi1/0/2 off off 0.0 n/a n/a 30.0
Gi1/0/3 off off 0.0 n/a n/a 30.0
Gi1/0/4 off off 0.0 n/a n/a 30.0
Gi1/0/5 off off 0.0 n/a n/a 30.0
Gi1/0/6 off off 0.0 n/a n/a 30.0
Gi1/0/7 off off 0.0 n/a n/a 30.0
Gi1/0/8 off off 0.0 n/a n/a 30.0
Gi1/0/9 static power-deny 15.4 n/a n/a 15.4