Cisco Air-AP1852I-B-K9 v02 not getting poe power from 3850 UPOE switch

[irfan-jamil]

Hi Guys,

Any thoughts that my Cisco Air-AP1852I-B-K9 v02 not getting poe power from 3850 UPOE switch?

I am using 1852i as ME and have tried (8.3 and 8.4,8.5) images with no luck. 3850 uPOE XE version is 3.6

[Scott Fella]

The ap should be able to power up with that switch unless there is an issue with the ap or that switch. If you have enough power available on the switch, then I would say it’s an issue with the ap.

[irfan-jamil]

HI Scott,

thanks for reply, enough power is there. just with single AP 1852i does not working on POE. with Power Adaptor it does work.

Tried with 3560 and 3650 poe as well no luck.

[Scott Fella]

I don’t know then. You have CDP enabled and the port able to power up another AP?

[irfan-jamil]

Hi Scott,

yes cdp is enable. port come up with same cable or different Ethernet cable to any other ap but only this AP 1852i brand new poe does not pick up

[Scott Fella]

Seems like the AP is bad. Open a TAC case and get an RMA.

[Leo Laohoo]

Do the following on the switch:
1. Command: test cable tdr interface <PORT>;
2. Wait for about 5 to 7 seconds for the process to complete;
3. Command: show cable tdr interface <PORT>;
4. Post the complete output to #3.

[irfan-jamil]

here you go Leo

show cable-diagnostics tdr interface gigabitEthernet 1/0/1
TDR test last run on: November 24 03:51:41

Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/1 1000M Pair A 8 +/- 10 meters Pair A Normal
Pair B 8 +/- 10 meters Pair B Normal
Pair C 8 +/- 10 meters Pair C Normal
Pair D 8 +/- 10 meters Pair D Normal

show power inline

Module Available Used Remaining
(Watts) (Watts) (Watts)
------ --------- -------- ---------
1 790.0 30.8 759.2
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/1 auto off 0.0 n/a n/a 60.0
Gi1/0/2 auto off 0.0 n/a n/a 60.0
Gi1/0/3 auto on 15.4 AIR-SAP3502I-N-K9 3 60.0
Gi1/0/4 auto off 0.0 n/a n/a 60.0
Gi1/0/5 auto on 15.4 AIR-CAP1602I-A-K9 3 60.0
Gi1/0/6 auto off 0.0 n/a n/a 60.0
Gi1/0/7 auto off 0.0 n/a n/a 60.0

here is output of 3700 series AP cabling output which taking power from same swhich

#show cable-diagnostics tdr interface gigabitEthernet 1/0/3
TDR test last run on: November 24 03:53:21

Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/3 1000M Pair A 8 +/- 10 meters Pair A Normal
Pair B 8 +/- 10 meters Pair B Normal
Pair C 8 +/- 10 meters Pair C Normal
Pair D 8 +/- 10 meters Pair D Normal

[irfan-jamil]

further more debug

*Nov 24 04:21:57.868: ILP:: Gi1/0/1: State=NGWC_ILP_DETECTING_S-2, Event=NGWC_ILP_IEEE_DET_SHORT_EV-29
*Nov 24 04:21:57.869: detected short from IEEE. still waiting to hear from phy Gi1/0/1

[Leo Laohoo]

I know what this is ...
Either Raise a TAC Case or upgrade the firmware of the switch. This could be CSCuz08086 or CSCvd46008.

[irfan-jamil]

HI Leo,

tried that with no luck. Looks like AP not responding at all to POE 

sh version
Cisco IOS Software, IOS-XE Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version 03.06.05.E RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2016 by Cisco Systems, Inc.
Compiled Thu 02-Jun-16 09:03 by prod_rel_team

show power inline

Module Available Used Remaining
(Watts) (Watts) (Watts)
------ --------- -------- ---------
1 790.0 30.8 759.2
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/1 auto off 0.0 n/a n/a 60.0
Gi1/0/2 auto off 0.0 n/a n/a 60.0
Gi1/0/3 auto on 15.4 AIR-SAP3502I-N-K9 3 60.0

[Leo Laohoo]

MOSFET PoE Bug is fixed in the latest (2019 releases) 3.6.X and 3.7.X firmware.
If not, as what Scott says, RMA the AP.