Solved: POE+ on WS-C2960S-24PS-L

bernhardrik · ‎01-15-2018

trying to activate poe+ at port level on our WS-C2960S-24PS-L switches. However 15.4W seems to be the admin max.

Module   Available     Used     Remaining
          (Watts)     (Watts)    (Watts)
------   ---------   --------   ---------
1           370.0      123.2       246.8
Interface Admin Oper       Power   Device              Class Max
                            (Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/1   auto   on         15.4    Ieee PD             3     30.0
Gi1/0/2   auto   on         15.4    Ieee PD             3     30.0
Gi1/0/3   auto   on         15.4    Ieee PD             3     30.0
Gi1/0/4   auto   on         15.4    Ieee PD             3     30.0
Gi1/0/5   auto   on         15.4    Ieee PD             4     30.0
Gi1/0/6   auto   on         15.4    Ieee PD             4     30.0
Gi1/0/7   auto   on         15.4    Ieee PD             4     30.0
Gi1/0/8   auto   on         15.4    Ieee PD             4     30.0

nterface Admin Oper       Power   Device              Class Max
                            (Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/6   auto   on         15.4    Ieee PD             4     30.0

Interface AdminPowerMax   AdminConsumption
             (Watts)           (Watts)
---------- --------------- --------------------

Gi1/0/6               30.0                 30.0

for int range gi1/0/5-8 we've included

power inline port 2x-mode (class becomes 4)

power inline consumption 30000 (not accepted/does not give any result)

on WS-C2960X-24PS-L no problem.

any suggestions in order to activate 802.3at ?

nixpengu1n · ‎01-15-2018

Hello,

There is no way to force a switch port to any specific standard - 802.3at or 802.3af, power allocation is done through negotiation process. So first you need to understand:

- Amount of PoE devices you want to connect to this switch

- What are their PoE requirements

Based on switch model you will be able to provide only 12 ports with 802.3at PoE standard maximum.

So in your case you need to apply following configuration (for ports 1 to 8)

conf t

default interface range gi1/0/1 - 8

interface range gi1/0/1 - 8

power inline auto

no shutdown

Then connect one device to port gi1/0/1 and see what power will be allocated. If device requires 30W, it should be 30W. Then you can continue with all other ports (maximum 12 ports).

More information could be found here:

https://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-ip-phone-7900-series/97869-poe-requirement-faq.html

https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-2960-series-switches/product_data_sheet0900aecd80322c0c.html

View solution in original post

Ben Walters · ‎01-15-2018

I would remove the power inline commands and just let the switch automatically determine the PoE+ requirements.

We have several 2960s with 3702 APs that require PoE+ and we don't configure anything specific for PoE on the ports. Just remove both of the power inline commands and bounce the port and see if it comes up with the proper PoE.

Mark Malone · ‎01-15-2018

Hi

what does the show run all for that port show you is there any hidden power commands in place ?

have you tried to use the debug while its powering up see whats happening in comparison to working switch port.... debug ilpower

bernhardrik · ‎01-15-2018

hidden commands

power inline consumption 30000
power inline auto max 30000
power inline police

should be ok or not ?

Mark Malone · ‎01-15-2018

Yes its already set then for POE+ by auto default , try put a device in that requires on 30watts see what happens

Scott Fella · ‎01-15-2018

You shouldn’t have to do anything. If you have cdp enabled for example, the AP’s would negotiate PoE with the switch. If this is an issue with your AP’s, check the cabling as IEEE PD is usually an issue with the patch, punch down or cable run.

-Scott
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nixpengu1n · ‎01-15-2018