Power Inline from PoE blade (4548, 4648)

Unanswered Question

Hi,

I have a LAP-1142 connected to one of our PoE blade in our 4506 switch, it used to work fine with the following power consumption:

Interface Admin  Oper            Power(Watts)     Device              Class
                            From PS    To Device                   
--------- ------ ---------- ---------- ---------- ------------------- -----

Gi4/3     auto   on         21.5       20.0       AIR-AP1252AG-A-K9   3

However, we had power issue on Apr 28, so it failed and we saw from the log below:

Apr 28 13:57:38.990: %C4K_ETHPORTMAN-3-INLINEPOWEROVERDRAWN: Inline powered device connected on port Gi4/3 exceeded its hardware protection threshold.
Apr 28 13:57:39.694: %PM-4-ERR_DISABLE: inline-power error detected on Gi4/3, putting Gi4/3 in err-disable state

After the power restored later, the other LAP connecting with the same blade restored without any problem, except this one:

Interface Admin  Oper            Power(Watts)     Device              Class
                            From PS    To Device                   
--------- ------ ---------- ---------- ---------- ------------------- -----

Gi4/3     auto   on         16.6       15.4       Ieee PD             3

We have tried to shutdown & restart the port but it doesn't help.

What may be the cause for this? LAP failed or port failed?

Thanks in advance for any helpful advise.

Regards,

Sunny

I have this problem too.
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The first step is to run the command "show power inline" to identify where things are at right now.

What you want to identify is where the inbalance is.

It may be that another PoE, or a combination of other PoEs, are using more power than is set for max or is available.  it could also be that this particular connection is using so much that it exceeds the limit.

Depending on your problem the solution will vary.

Here is a link to help you out.

http://www.ciscosystems.com/en/US/docs/switches/lan/catalyst3750/software/troubleshooting/power_over_ethernet.html#wp1018018

I know it isn't for your exact model, but the commands will be the same to set limits and whatnot.

(edit)

I missed your previous show power inline entry.

Your over the wattage max for that port.  You can just increase the limit with "power inline port maximum 17000".  The 15.4 is the standard default, from memory, and that should resolve your issue.  BTW that command is an configure interface  command.

Hi Ryan,

Thank you for your reply. However it still doesn't correct the picture.

Here I show you more info:

4506#sh pow capabilities
Power Summary                      Maximum
(in Watts)              Used     Available
----------------------   ----     ---------
System Power (12V)        614        1299
Inline Power (-50V)       761        1446
Backplane Power (3.3V)      0          40
----------------------   ----     ---------
Total                    1375 (not to exceed Total Maximum Available = 2100)


4506#sh pow inl mo 4 | i on
Gi4/1     auto   on         21.5       20.0       AIR-AP1252AG-A-K9   3   
Gi4/3     auto   on         16.6       15.4       Ieee PD             3   
Gi4/4     auto   on         21.5       20.0       AIR-AP1252AG-A-K9   3   
Gi4/5     auto   on         21.5       20.0       AIR-AP1252AG-A-K9   3   
Gi4/6     auto   on         21.5       20.0       AIR-AP1252AG-A-K9   3   
Gi4/7     auto   on         21.5       20.0       AIR-AP1252AG-A-K9   3   
Gi4/8     auto   on         21.5       20.0       AIR-AP1252AG-A-K9   3   
Gi4/9     auto   on         21.5       20.0       AIR-AP1252AG-A-K9   3   
Gi4/10    auto   on         21.5       20.0       AIR-AP1252AG-A-K9   3   
Gi4/11    auto   on         21.5       20.0       AIR-AP1252AG-A-K9   3   
Gi4/12    auto   on         21.5       20.0       AIR-AP1252AG-A-K9   3   
Gi4/13    auto   on         21.5       20.0       AIR-AP1252AG-A-K9   3   
Gi4/15    auto   on         21.5       20.0       AIR-AP1252AG-A-K9   3   
Gi4/16    auto   on         21.5       20.0       AIR-AP1252AG-A-K9   3   
Gi4/17    auto   on         21.5       20.0       AIR-AP1252AG-A-K9   3   
Gi4/18    auto   on         21.5       20.0       AIR-AP1252AG-A-K9   3   
Gi4/26    auto   on         16.6       15.4       Ieee PD             3   
Gi4/42    auto   on         21.5       20.0       AIR-AP1252AG-A-K9   3   
Totals:          18   on    377.2      350.8   

4506#sh pow in g4/3
Available:1446(w)  Used:761(w)  Remaining:685(w)

Interface Admin  Oper            Power(Watts)     Device              Class
                            From PS    To Device                   
--------- ------ ---------- ---------- ---------- ------------------- -----

Gi4/3     auto   on         16.6       15.4       Ieee PD             3  

Interface  AdminPowerMax   AdminConsumption   
             (Watts)           (Watts)          
---------- --------------- --------------------

Gi4/3                 30.0                 15.4

4506#sh pow in g4/4
Available:1446(w)  Used:761(w)  Remaining:685(w)

Interface Admin  Oper            Power(Watts)     Device              Class
                            From PS    To Device                   
--------- ------ ---------- ---------- ---------- ------------------- -----

Gi4/4     auto   on         21.5       20.0       AIR-AP1252AG-A-K9   3  

Interface  AdminPowerMax   AdminConsumption   
             (Watts)           (Watts)          
---------- --------------- --------------------

Gi4/4                 30.0                 15.4

And i cannot increase the max. power allowed on the port, the only available comment is:

4506(config-if)#pow inline consu ?
  <4000-15400>  milli-watts

4506(config-if)#exit            
4506(config)#pow inl con ?
  default  Inline device power consumption

4506(config)#pow inl con defaul ?
  <4000-15400>  milli-watts

The switch is 4506E with IOS 12.2(50)SG3,  I think it should not be related but just listed here also.

I don't know why only these 2 APs are not restored after power resumed but OK for the rest. It doesn't look like there is over-powered as I still have remaining power available shown. Any further idea you may have?

Thanks again.

Rgds,

Sunny

Leo Laohoo Tue, 05/04/2010 - 14:55

The 1140 is designed to receive a maximum power of 20.0 w but is capable of operating 15.4w.  You should be fine.

Hi Leolaohoo,

Thanks for your reply. But the problem is the AP is not UP and the interface showing DISCONNECT even though it's having 15.4W power from the PoE blade.

4506#sh pow inl g4/3
Available:1446(w)  Used:761(w)  Remaining:685(w)

Interface Admin  Oper            Power(Watts)     Device              Class
                            From PS    To Device                   
--------- ------ ---------- ---------- ---------- ------------------- -----

Gi4/3     auto   on         16.6       15.4       Ieee PD             3   

Interface  AdminPowerMax   AdminConsumption   
             (Watts)           (Watts)          
---------- --------------- --------------------

Gi4/3                 30.0                 15.4
4506#sh int g4/3
GigabitEthernet4/3 is down, line protocol is down (notconnect)
  Hardware is Gigabit Ethernet Port, address is 0025.4539.1282 (bia 0025.4539.1282)
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Auto-duplex, Auto-speed, link type is auto, media type is 10/100/1000-TX
  input flow-control is off, output flow-control is off
  Auto-MDIX on (operational: on)
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 3d23h, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     16524962 packets input, 2582543800 bytes, 0 no buffer
     Received 470083 broadcasts (230194 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     45279045 packets output, 9618699729 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out

Do you think that it's the power issue or AP malfunction?

Thanks.

Regards,

Sunny

Leo Laohoo Fri, 05/07/2010 - 23:14

This is a very wierd case.  I had a look at your first post and I saw the line "putting Gi4/3 in err-disable state".  Have you tried to enable/disable state?  What is the result when you do a "sh int statu err"?  Can you run a "test cable tdr int Gi4/3"?  Wait for a few seconds and replace "test" with "show" and post the result.

I tried to "sh int status err"; "test cable tdr int g4/3"; and then "sh cable tdr int g4/3", none of them have anything being shown.

The strange thing is that I cannot see any power being drawn on "int g4/3", that i used to see

"Gi4/3    auto   on         16.6       15.4       Ieee PD             3"

Now it's "Gi4/3     auto   off        0.0        0.0        n/a                 n/a  "

I dont think the AP1252 havve been unplugged, but I have to check.

Thanks.

djb127 Mon, 09/06/2010 - 23:33

During the power incident, CDP probably became disabled on this AP.

sjg Tue, 11/22/2011 - 07:06

I found what I beleive is a work around for this issue; try " power inline static "  command for the interface that is having the issue.

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