Cat 3850 PoE class 4 LLDP issue

Terry Tao · ‎05-02-2019

Hi All,

I met a problem on a Cat 3850 24X UPOE switch, I have a class 4 PoE PD device with LLDP enabled, it can acquire class 4 25.5W power through LLDP on a port (Te1/0/6), but the same PD device can only acquire class 3 15.4W on another port (Te1/0/2), here are detailed information:

On port Te1/0/6, class 4 PD with LLDP enabled can sucessfully acquire 25.5W:

cisco-3850#
*May 2 23:13:30.241: %ILPOWER-5-IEEE_DISCONNECT: Interface Te1/0/2: PD removed
*May 2 23:13:31.352: %LINK-3-UPDOWN: Interface TenGigabitEthernet1/0/2, changed state to down
*May 2 23:13:34.372: %ILPOWER-7-DETECT: Interface Te1/0/6: Power Device detected: IEEE PD
*May 2 23:13:35.290: %ILPOWER-5-POWER_GRANTED: Interface Te1/0/6: Power granted
*May 2 23:13:36.491: %LINK-3-UPDOWN: Interface TenGigabitEthernet1/0/6, changed state to up
*May 2 23:13:37.492: %LINEPROTO-5-UPDOWN: Line protocol on Interface TenGigabitEthernet1/0/6, changed state to upshow power inline

Module Available Used Remaining
(Watts) (Watts) (Watts)
------ --------- -------- ---------
1 550.0 60.0 490.0
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Te1/0/1 auto off 0.0 n/a n/a 60.0
Te1/0/2 auto off 0.0 n/a n/a 60.0
Te1/0/3 auto off 0.0 n/a n/a 60.0
Te1/0/4 auto off 0.0 n/a n/a 60.0
Te1/0/5 auto off 0.0 n/a n/a 60.0
Te1/0/6 auto on 30.0 Ieee PD 4 60.0
Te1/0/7 auto off 0.0 n/a n/a 60.0
Te1/0/8 auto off 0.0 n/a n/a 60.0
Te1/0/9 auto errdisable 0.0 n/a n/a 60.0
Te1/0/10 auto off 0.0 n/a n/a 60.0
Te1/0/11 auto off 0.0 n/a n/a 60.0
Te1/0/12 auto off 0.0 n/a n/a 60.0
Te1/0/13 auto off 0.0 n/a n/a 60.0
Te1/0/14 auto on 30.0 Ieee PD 4 60.0
Te1/0/15 auto off 0.0 n/a n/a 60.0

cisco-3850#show power inline Te1/0/6 detail
Interface: Te1/0/6
Inline Power Mode: auto
Operational status: on
Device Detected: yes
Device Type: Ieee PD
IEEE Class: 4
Discovery mechanism used/configured: Ieee and Cisco
Police: off

Power Allocated
Admin Value: 60.0
Power drawn from the source: 30.0
Power available to the device: 30.0

Actual consumption
Measured at the port: 9.3
Maximum Power drawn by the device since powered on: 10.1

Absent Counter: 0
Over Current Counter: 0
Short Current Counter: 0
Invalid Signature Counter: 0
Power Denied Counter: 0

cisco-3850#show lldp neighbors Te1/0/6 detail
------------------------------------------------
Local Intf: Te1/0/6
Chassis id: 00c0.17b6.0001
Port id: 00c0.17b6.0001
Port Description - not advertised
System Name - not advertised
System Description - not advertised

Time remaining: 30670 seconds
System Capabilities - not advertised
Enabled Capabilities - not advertised
Management Addresses - not advertised
Auto Negotiation - not supported
Physical media capabilities - not advertised
Media Attachment Unit type - not advertised
Vlan ID: - not advertised
PoE+ Power-via-MDI TLV:
Power Pair: Signal
Power Class: Class 4
Power Device Type: Type 2 PD
Power Source: PSE
Power Priority: critical
Power Requested: 25500 mW

On port Te1/0/2 it can only acquire 15.4W and LLDP negotiation failed:

*May 2 23:10:53.920: %ILPOWER-5-POWER_GRANTED: Interface Te1/0/2: Power granted
*May 2 23:10:53.990: %LINK-3-UPDOWN: Interface TenGigabitEthernet1/0/4, changed state to down
*May 2 23:10:58.281: %LINK-3-UPDOWN: Interface TenGigabitEthernet1/0/2, changed state to up
cisco-3850#show lldp neighbors Te1/0/2 detail

Total entries displayed: 0

cisco-3850#show power inline Te1/0/2 detail
Interface: Te1/0/2
Inline Power Mode: auto
Operational status: on
Device Detected: yes
Device Type: Ieee PD
IEEE Class: 4
Discovery mechanism used/configured: Ieee and Cisco
Police: off

Power Allocated
Admin Value: 60.0
Power drawn from the source: 15.4
Power available to the device: 15.4

Actual consumption
Measured at the port: 10.1
Maximum Power drawn by the device since powered on: 10.3

Absent Counter: 0
Over Current Counter: 0
Short Current Counter: 0
Invalid Signature Counter: 0
Power Denied Counter: 0

cisco-3850#show power inline

Module Available Used Remaining
(Watts) (Watts) (Watts)
------ --------- -------- ---------
1 550.0 45.4 504.6
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Te1/0/1 auto off 0.0 n/a n/a 60.0
Te1/0/2 auto on 15.4 Ieee PD 4 60.0
Te1/0/3 auto off 0.0 n/a n/a 60.0
Te1/0/4 auto off 0.0 n/a n/a 60.0
Te1/0/5 auto off 0.0 n/a n/a 60.0
Te1/0/6 auto off 0.0 n/a n/a 60.0
Te1/0/7 auto off 0.0 n/a n/a 60.0
Te1/0/8 auto off 0.0 n/a n/a 60.0
Te1/0/9 auto errdisable 0.0 n/a n/a 60.0
Te1/0/10 auto off 0.0 n/a n/a 60.0
Te1/0/11 auto off 0.0 n/a n/a 60.0
Te1/0/12 auto off 0.0 n/a n/a 60.0
Te1/0/13 auto off 0.0 n/a n/a 60.0
Te1/0/14 auto on 30.0 Ieee PD 4 60.0
Te1/0/15 auto off 0.0 n/a n/a 60.0

Mark Malone · ‎05-03-2019

Hi
so your not getting POE+ on 1 of the ports , that could be a hardware issue especially if same device is working at 25w on other port
these switches should be full POE , is it possible to statistically set it under the interface , power inline max milli-watts xxx , does that make a difference ? if not i would contact TAC as look like the switch is only providing 15.4 for that port

Power available to the device: 15.4

Full IEEE 802.3at (PoE+) with 30W power on all copper ports in 1 Rack Unit (RU) form factor

Terry Tao · ‎05-03-2019

Thanks for your reply, I tried "power inline static max 60000" but doesn't make a difference, the class 4 PD with LLDP enabled failed LLDP negotiation and acquired class3 15.4W.

Terry Tao · ‎05-03-2019

Thanks for your reply, I tried "power inline static max 60000" but doesn't make a difference, the class 4 PD with LLDP enabled failed LLDP negotiation and acquired class3 15.4W.

Mark Malone · ‎05-03-2019

what type of phone is it ?
are they non Cisco if using LLDP

Terry Tao · ‎05-05-2019

Thanks for reply, it's a non Cisco device, but able to acquire class 4 25.5W through LLDP on Cat 3850 ports #1, #3, #11, #12, #18, etc.