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Troubleshooting POE not working with non-Cisco POE device

olivier.martin
Level 1
Level 1

Friends,
I'm trying to get a POE device up (supposed to support 802.3at) on a stack of 3750X. I'm having the following outputs when I connect this device.

Jan 20 04:27:31.192: %ILPOWER-7-DETECT: Interface Gi1/0/33: Power Device detected: IEEE PD
Jan 20 04:27:31.192: Ilpower PD device 3 class 3 from interface (Gi1/0/33)
Jan 20 04:27:31.192: ilpower new power from pd discovery Gi1/0/33, power_status ok
Jan 20 04:27:31.192: Ilpower interface (Gi1/0/33) power status change, allocated power 15400
Jan 20 04:27:31.654: ilpower_notify_lldp_tlv: lldp power class tlv:
Jan 20 04:27:31.654: (curr/prev) pwr value 15400/0
Jan 20 04:27:31.696: ilpower_powerman_power_available_tlv: about sending patlv on Gi2/0/4
Jan 20 04:27:31.696: req id 0, man id 1, pwr avail 0, pwr man -1
Jan 20 04:27:31.696: ilpower_notify_lldp_power_via_mdi_tlv Gi1/0/33 pwr alloc 15400
Jan 20 04:27:31.704: Gi1/0/33 STATIC PORT PWR Alloc 130
NEWCOR(config-if)#
Jan 20 04:27:31.721: Gi1/0/33: LLDP NOTIFY TLV:
(curr/prev) PSE Allocation: 13000/0
(curr/prev) PD Request : 13000/0
(curr/prev) PD Class : Class 0/
(curr/prev) PD Priority : high/unknown
(curr/prev) Power Type : Type 2 PSE/Type 2 PSE
(curr/prev) mdi_pwr_support: 7/0
(curr/prev Power Pair) : Signal/
(curr/prev) PSE Pwr Source : Primary/Unknown
NEWCOR(config-if)#
Jan 20 04:27:32.333: %ILPOWER-5-POWER_GRANTED: Interface Gi1/0/33: Power granted
NEWCOR(config-if)#
Jan 20 04:27:34.237: ilpower_powerman_power_available_tlv: about sending patlv on Gi1/0/37
Jan 20 04:27:34.237: req id 0, man id 1, pwr avail 0, pwr man -1
Jan 20 04:27:35.378: ilpower delete power from pd linkdown Gi1/0/33
Jan 20 04:27:35.378: Ilpower interface (Gi1/0/33), delete allocated power 15400
Jan 20 04:27:35.378: ilpower_notify_lldp_power_via_mdi_tlv Gi1/0/33 pwr alloc 15400
Jan 20 04:27:35.378: Gi1/0/33 STATIC PORT PWR Alloc 130
Jan 20 04:27:35.378: Gi1/0/33: LLDP NOTIFY TLV:
(curr/prev) PSE Allocation: 13000/0
(curr/prev) PD Request : 13000/0
(curr/prev) PD Class : Class 0/
(curr/prev) PD Priority : high/unknown
(curr/prev) Power Type : Type 2 PSE/Type 2 PSE
(curr/prev) mdi_pwr_support: 7/0
(curr/prev Power Pair) : Signal/
(curr/prev) PSE Pwr Source : Primary/Unknown
Jan 20 04:27:35.395: ilpower_notify_lldp_tlv: lldp power class tlv:
Jan 20 04:27:35.395: (curr/prev) pwr value 15400/0
Jan 20 04:27:35.403: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/33: PD removed
Jan 20 04:27:36.368: %ILPOWER-7-DETECT: Interface Gi1/0/33: Power Device detected: IEEE PDI ha...

And it restarts in a loop. The configuration for port Gi1/0/33 is the following:

interface GigabitEthernet1/0/33
switchport access vlan 32
switchport mode access
load-interval 30
power inline consumption 15400
power inline static max 15400
speed 100
duplex full
mls qos trust dscp
spanning-tree portfast
service-policy input qos-map
end

I've tried a few things (the device is 100Mbps and full duplex - it's not a recent thing). So is my switches stack.

Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 54 WS-C3750X-48P 15.2(2)E4 C3750E-UNIVERSALK9-M
2 54 WS-C3750X-48P 15.2(2)E4 C3750E-UNIVERSALK9-M

So it's not new but it works very well with a number of other devices. On the same port, I can put a Cisco POE device (I tried an extra AP I have) and it worked as expected. Budget is not even close to exhaustion.

 

NEWCOR#sh power inline

Module Available Used Remaining
(Watts) (Watts) (Watts)
------ --------- -------- ---------
1 840.0 47.6 792.4
2 870.0 33.6 836.4
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/1 auto off 0.0 n/a n/a 30.0
Gi1/0/2 auto off 0.0 n/a n/a 30.0
Gi1/0/3 auto off 0.0 n/a n/a 30.0
...

Gi1/0/24 auto off 0.0 n/a n/a 30.0
Gi1/0/25 auto off 0.0 n/a n/a 30.0
Gi1/0/26 auto on 16.8 AIR-CAP2702I-A-K9 4 30.0
Gi1/0/27 auto off 0.0 n/a n/a 30.0
Gi1/0/28 auto off 0.0 n/a n/a 30.0
..

Gi1/0/32 auto off 0.0 n/a n/a 30.0
Gi1/0/33 static on 15.4 Ieee PD 0 15.4
Gi1/0/34 auto off 0.0 n/a n/a 30.0
Gi1/0/35 auto off 0.0 n/a n/a 30.0

...

I've run a troubleshooting with debug ilpower powerman without any obvious indicator but I might be overlooking something. Is there a way to just supply power and ignore the LLDP conversation going on? Maybe this is a dumb idea, I don't know the LLDP protocol at all. 

thanks for any idea!

4 Replies 4

Leo Laohoo
Hall of Fame
Hall of Fame

@olivier.martin wrote:
power inline consumption 15400
power inline static max 15400

Why put these two commands when, by default, the port will always provide 15.4wac power during the start of the PoE negotiation?

What is the PED that is trying to power up?  Is it a Ubiquiti AP?

thanks! I put this as I was troubleshooting. Even if I remove these two commands, I see the same outcome. The device is a home automation device, an Elan TP7 touchscreen, which is supposed to support 802.3at as per its specs...

Remove the duplex and speed settings and then do the following: 

1.  Command:  test cable tdr interface Gi1/0/33
2.  Wait for about 7 seconds; 
3.  Command:  show cable tdr interface Gi1/0/33
4.  Post the entire output to #3.

 

Here's the output of the (with the cable disconnected from the device). I will say that it works perfectly well with another, Cisco device I hooked on the same port and patch cable. Thank you!!

NEWCOR#show cable tdr int gi1/0/33
TDR test last run on: January 20 11:51:15

Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/33 auto Pair A 30 +/- 10 meters N/A Open
Pair B 28 +/- 10 meters N/A Open
Pair C 28 +/- 10 meters N/A Open
Pair D 30 +/- 10 meters N/A Open

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