LAP 1142N "Radio disabled due to PoE" after upgrade to 7.6.120

sascha.frey · ‎06-03-2014

Recently, we upgraded our 5508 wireless controllers from 7.4.110.0 to 7.6.120.0.

One AP (AIR-LAP1142N-E-K9) doesn't work now.

Both radios are stuck in state 'reset':

AP#sh int dot11Radio 0 | inc Dot11Radio0
Dot11Radio0 is reset, line protocol is down

It seems to be a PoE issue:

AP#sh controllers dot11Radio 0
Radio disabled due to PoE
[...]

This 1142N is connected to a HP switch (model 3800 with 802.3af/802.3at support). It did work on this switch several months before this upgrade and it works if connected to Cisco switch (Cat 6513).

We didn't upgrade the switch firmware or change its configuration.

The PoE status from the switch CLI:

PoE | Power Power Alloc Alloc Actual Config Detection Power Pre-std
Port | Enable Priority By Power Power Type Status Class Detect
------ + ------ -------- ----- ----- ------ -------- ----------- ----- ------

21 | Yes low lldp 33 W 7.8 W Delivering 3 off

Other APs (80 3602 connected to HP8212zl switches) do work without any problem.

Any idea how to solve this?

Leo Laohoo · ‎06-03-2014

According to the output, the AP is drawing only 7.8w instead of 15.4w PoE. Not an HP person but is there more-than-enough power left on the switch to provide 15.4w PoE?

sascha.frey · ‎06-03-2014

Yes, there is plenty of power available:

1000W available, but only 129W currently drawn

PS# Model State AC/DC + V Wattage Max
----- --------- --------------- ----------------- --------- ------
1 J9580A Powered AC 120V/240V 129 1000

The output on our other HP switches with 3602s connected is similar:

I21 | Yes low lldp 16 W 7.4 W Delivering 4 on

jmeachum · ‎06-03-2014

I you have access to the AP could you do a reset via the Mode button on the AP?

Mathieu Sturm · ‎07-14-2014

After updating to 7.6.120 we've noticed that some of our AP's wouldn't come up. After looking in the switch's logs I found this

chassis: Ports PoE usage has exceeded threshold of 80%.

The power drawn is 117w (show power-over-ethernet).

When I use the following command: show power-over-ethernet brief I get this:

PoE | Power Power Alloc Alloc Actual Configured Detection Power Pre-std
Port | Enable Priority By Power Power Type Status Class Detect
----- + ------ -------- ----- ----- ------ ----------- ----------- ----- ------
1 | Yes low lldp 17 W 7.0 W Delivering 3 off
2 | Yes low lldp 17 W 7.0 W Delivering 3 off
3 | Yes low lldp 17 W 6.8 W Delivering 3 off
4 | Yes low lldp 17 W 7.1 W Delivering 3 off
5 | Yes low lldp 17 W 7.0 W Delivering 3 off
6 | Yes low lldp 17 W 6.9 W Delivering 3 off
7 | Yes low lldp 17 W 6.8 W Delivering 3 off
8 | Yes low lldp 17 W 6.7 W Delivering 3 off
9 | Yes low lldp 17 W 6.9 W Delivering 3 off
10 | Yes low usage 17 W 0.0 W Disabled 3 off

Port 10 is where the missing AP is on.

How is it possible that after the update to 7.6.120 the AP won't work anymore?

bolsiusint1 · ‎07-24-2014

Anyone a solution? We see the same behavior

LAP 1142N on a HP 2620-24-PoE+ Switch J9625A,

SW01# show power-over-ethernet 22

Status and Counters - Port Power Status for port 22

Power Enable      : Yes
                                        LLDP Detect       : enabled
Priority          : critical          Configured Type   :
AllocateBy        : usage             Value             : 17 W
Detection Status : Delivering        Power Class       : 3

Over Current Cnt : 0 MPS Absent Cnt : 0
Power Denied Cnt : 0 Short Cnt : 0

Voltage : 55.4 V Current : 131 mA
Power : 7.2 W

When i fail back the AP to a controller with 7.4.121.0 it will work. If it's moved to 7.6.120.0 then the PoE warning.. Also Overide doesn't work.

I also saw it on AIR-CAP2602I-E-K9

Kamaljeet Singh · ‎08-20-2014

Hi,

Can you please provide POE debugs on HP switch.