[c-nsp] Spare-pair power negotiation problem.. Cisco 3850 UPOE

Peter Kranz pkranz at unwiredltd.com
Mon Apr 25 18:47:17 EDT 2016

Anyone had any luck with UPOE actually working with the power inline
four-pair forced command?


WS-C3850-48U / Denali 16.2.1


interface GigabitEthernet1/0/10

 power inline four-pair forced




*Apr 25 08:37:59.062 PST: %ILPOWER-5-DET_TIMEOUT_SPARE_PAIR: Interface
Gi1/0/10: spare pair detect timeout

Of course its timing out, I'm using "power inline four-pair forced" because
the device does not support sending Cisco the four pair negotiation message.
This command is supposed to ignore this..




UnwiredSW-#show power inline g1/0/10  detail

Interface: Gi1/0/10

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: 60.0

Power available to the device: 60.0

 Actual consumption

Measured at the port: 32.5

Maximum Power drawn by the device since powered on: 33.6

 Absent Counter: 0

Over Current Counter: 0

Short Current Counter: 0

Invalid Signature Counter: 0

Power Denied Counter: 0


Power Negotiation Used: None

LLDP Power Negotiation --Sent to PD--      --Rcvd from PD--

   Power Type:          -                    -

   Power Source:        -                    -

   Power Priority:      -                    -

   Requested Power(W):  -                    -

   Allocated Power(W):  -                    -


Four-Pair PoE Supported: Yes

Spare Pair Power Enabled: No  <-- Should be enabled per the forced command

Four-Pair PD Architecture: Independent


And then when you try to use more than 30 watts:


*Apr 25 08:43:32.212 PST: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/10: PD

*Apr 25 08:43:32.215 PST: %ILPOWER-3-CONTROLLER_PORT_ERR: Controller port
error, Interface Gi1/0/10: Power Controller reports power Imax error

*Apr 25 08:43:32.742 PST: %LINEPROTO-5-UPDOWN: Line protocol on Interface
GigabitEthernet1/0/10, changed state to down


Peter Kranz
www.UnwiredLtd.com <http://www.unwiredltd.com/> 
Desk: 510-868-1614 x100
Mobile: 510-207-0000
pkranz at unwiredltd.com <mailto:pkranz at unwiredltd.com> 


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