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POE problem on HP J9727A 2920-24G-PoE+ Switch

vvk123
Occasional Visitor

POE problem on HP J9727A 2920-24G-PoE+ Switch

I have a stack consistent of two switches:

sw11# show stacking 

Stack ID         : 01002c59-e512c640                                                     
MAC Address      : 2c59e5-12c663
Stack Topology   : Ring                                    
Stack Status     : Active                                  
Uptime           : 2d 23h 35m  
Software Version : WB.15.12.0010

 Mbr                                                                         
 ID  Mac Address   Model                                  Pri Status         
 --- ------------- -------------------------------------- --- ---------------
 1   2c59e5-12c640 HP J9727A 2920-24G-PoE+ Switch         128 Standby        
 2   d4c9ef-aaa040 HP J9728A 2920-48G Switch              128 Commander      
sw11# 

 The problem is that the half of the ports doesn't delivering power via POE (detection status: disabled):

 

sw11# show power-over-ethernet brief 

 Status and Counters - Port Power Status

  Member 1 Power
  Available: 370 W  Used: 0 W  Remaining: 370 W

  PoE   | Power  Power    Alloc Alloc Actual Configured  Detection   Power Pre-std
  Port  | Enable Priority By    Power Power  Type        Status      Class Detect
  ----- + ------ -------- ----- ----- ------ ----------- ----------- ----- ------
  1/1   | Yes    high     value 12 W  0.0 W              Disabled    0     off   
  1/2   | Yes    critical value 12 W  0.0 W              Disabled    0     off   
  1/3   | Yes    high     value 12 W  0.0 W              Disabled    0     off   
  1/4   | Yes    high     value 12 W  0.0 W              Disabled    0     off   
  1/5   | Yes    high     value 12 W  0.0 W              Disabled    0     off   
  1/6   | Yes    high     value 12 W  0.0 W              Disabled    0     off   
  1/7   | Yes    high     value 12 W  0.0 W              Disabled    0     off   
  1/8   | Yes    high     value 12 W  0.0 W              Disabled    0     off   
  1/9   | Yes    high     value 12 W  0.0 W              Disabled    0     off   
  1/10  | Yes    high     value 12 W  0.0 W              Disabled    0     off   
  1/11  | Yes    high     value 12 W  0.0 W              Disabled    0     off   
  1/12  | Yes    high     value 12 W  0.0 W              Disabled    0     off   
  1/13  | Yes    low      value 12 W  0.0 W              Searching   0     off   
  1/14  | Yes    low      value 12 W  0.0 W              Searching   0     off   
  1/15  | Yes    low      value 12 W  0.0 W              Searching   0     off   
  1/16  | Yes    low      value 12 W  0.0 W              Searching   0     off   
  1/17  | Yes    low      value 12 W  0.0 W              Searching   0     off   
  1/18  | Yes    low      value 12 W  0.0 W              Searching   0     off   
  1/19  | Yes    low      value 12 W  0.0 W              Searching   0     off   
  1/20  | Yes    low      value 12 W  0.0 W              Searching   0     off   
  1/21  | Yes    low      value 12 W  0.0 W              Searching   0     off   
  1/22  | Yes    low      value 12 W  0.0 W              Searching   0     off   
  1/23  | Yes    low      value 12 W  0.0 W              Searching   0     off   
  1/24  | Yes    low      value 12 W  0.0 W              Searching   0     off   
 

I can manually put disabled ports to "searching" by executing 

 

 

sw11(config)# interface 1/1-1/24 power-over-ethernet
sw11(config)# reload

 

After that, PoE works fine on ports 1-12, but only for some time. On the next day ports 1-12 again "disabled". The question is: how to permanently turn on searching for poe devices on all ports?

9 REPLIES
nlandas
Frequent Visitor

Re: POE problem on HP J9727A 2920-24G-PoE+ Switch

Are you saving the configuration after you changes?

 

So turn on POE on all ports.

 

interface (Iface list) power-over-ethernet

wri mem

reload

 

See if that retains the changes.

T-Rock
Occasional Advisor

Re: POE problem on HP J9727A 2920-24G-PoE+ Switch

I sure wish that people would actually reply back to let others know if suggestions to their problems worked...

Brian-OD
Occasional Visitor

Re: POE problem on HP J9727A 2920-24G-PoE+ Switch

Recieving same issue, expect PoE ports 2/1-2/12 will not enable. They stay in an Disabled State. Rebooting switch causes a temporary solution, then reverts. Running WB.15.17.0010 on an 3 2920 stack.    

besc
Advisor

Re: POE problem on HP J9727A 2920-24G-PoE+ Switch

Having quite the same problem and subscribing to the thread.

Richard Litchfield
Respected Contributor

Re: POE problem on HP J9727A 2920-24G-PoE+ Switch

You will need to log a call if there is an actual fault.

You may be able to see somethng useful with commands like this:

show logging -r -w

- w shows the Warning arlarms (do a ? to see other options). Example below has warnings as power cables were disconnected/reconnected.

W 02/20/16 19:42:06 00576 chassis: 50V Power Supply 1 is Faulted. Failures: 2
W 02/20/16 19:42:05 00071 chassis: Power Supply failure:  Supply: 1, Failures: 2
W 02/20/16 19:35:17 00071 chassis: Power Supply OK:  Supply: 1, Failures: 1
W 02/20/16 19:35:17 00576 chassis: 50V Power Supply 1 is OK. Failures: 1
W 02/20/16 19:35:11 00576 chassis: 50V Power Supply 1 is Faulted. Failures: 1
W 02/20/16 19:35:11 00071 chassis: Power Supply failure:  Supply: 1, Failures: 1

Also

show power-over-ethernet brief
show power-over-ethernet
show run int 1/12
besc
Advisor

Re: POE problem on HP J9727A 2920-24G-PoE+ Switch

I was able to figure out that it wasn't the PoE issue that's causing the problem.

Nas_IT
Occasional Visitor

Re: POE problem on HP J9727A 2920-24G-PoE+ Switch

Can you please tell us what was the issue. Even we are facing the same issue. Power-over-ethernet goes to disabled mode frequently. Have to enable PoE by running command "power-over-ethernet" on the disable ports. But this is a temporary solution.

TechVik
Occasional Visitor

Re: POE problem on HP J9727A 2920-24G-PoE+ Switch

I found a possible solution to this problem that I'd like to share. 

The following command allows the switch to calculate power draw on actual power usage instead of the reported LLDP value:  no lldp config 1-24 dot3TlvEnable poe_config

This link is a very good writeup explaining the problem.

https://www.sourceonetechnology.com/insufficient-power-allocation-error-message-on-hp-switches/

I hope this helps

G_Tech
Occasional Visitor

Re: POE problem on HP J9727A 2920-24G-PoE+ Switch

"The following command allows the switch to calculate power draw on actual power usage instead of the reported LLDP value:  no lldp config 1-24 dot3TlvEnable poe_config"This fixed a similiar issue that I started having on an 8212zl