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11-06-2013 02:18 AM
11-06-2013 02:18 AM
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?
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07-29-2014 11:04 AM
07-29-2014 11:04 AM
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.
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10-20-2015 01:16 PM
10-20-2015 01:16 PM
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...
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02-22-2016 09:42 AM
02-22-2016 09:42 AM
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.
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02-25-2016 10:30 PM
02-25-2016 10:30 PM
Re: POE problem on HP J9727A 2920-24G-PoE+ Switch
Having quite the same problem and subscribing to the thread.
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02-26-2016 04:51 AM
02-26-2016 04:51 AM
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
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06-10-2016 07:44 PM
06-10-2016 07:44 PM
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.
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08-24-2016 08:22 PM
08-24-2016 08:22 PM
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.
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02-20-2017 05:55 PM
02-20-2017 05:55 PM
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
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04-07-2017 05:40 AM
04-07-2017 05:40 AM
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
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