AP 2702 draws low Power from Ethernet

[stratmann83]

Hello,

we have just installed a new cisco wireless infrastructure. And actually it works fine. But our Prime (V2.2) is showing the following critical error for most of our Accesspoints, not for all:

Access point 'OV-B-BM1-AP-03' associated with controller
'OV-B-V05-WLC-1' draws low power from Ethernet. Failure reason: 'The
AP draws 15.4 watts from Ethernet'.

We have 2702 APs connected to a WLC 5508 (v8.0.120.0) and most of the switches are WS-C2960+24PC-L with 12.2(50)SE5, 12.2(55)SE7 and 15.0(2)SE6. Some of the APs are connected with Motorola Injectors but they have the same problem.

This is the example of one of the switches:

OV-B-V09-ASW-1#sh power inline
Available:370.0(w)  Used:323.4(w)  Remaining:46.6(w)

Interface Admin  Oper       Power   Device              Class Max
                            (Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Fa0/1     auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/2     auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/3     auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/4     auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/5     auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/6     auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/7     auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/8     auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/9     auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/10    auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/11    auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/12    auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/13    auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/14    auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/15    auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/16    auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/17    auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/18    auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/19    auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/20    auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/21    auto   on         15.4    AIR-CAP2702E-E-K9   4     15.4
Fa0/22    auto   off        0.0     n/a                 n/a   15.4
Fa0/23    auto   off        0.0     n/a                 n/a   15.4
Fa0/24    auto   off        0.0     n/a                 n/a   15.4

This is how the ports are configured, nothing special regarding the power.

!
interface FastEthernet0/1
 switchport access vlan 251
 switchport mode access
 spanning-tree portfast

As far as we know, POE+ is actually required, but it works without as well. The only thing is that the Prime Errors are kind of annoying.

Any suggestions? Thanks in advance

[Trent Hurt · Accepted solution]

They need Poe+ for full feature set.  See this blog post for details

http://www.my80211.com/home/2015/10/6/which-antenna-gets-deactivated-when-you-provide-less-than-fu.html

[George Stefanick]

I just have to endorse this .. don't know why ... I just do .. LOL

[stratmann83]

Hmmm yea, I don`t know why, but I guess I heard this before. ;-)

[stratmann83]

Thank you. Good to know where exactly the Prime is getting the message from. I checked that and it looks just like in the example. One Antenna is disabled. But like i said, that`s ok. We dont need full feature set. What I need is a Prime not confusing me with an error for every singe AP. Do you know how i get rid of the messages permamently?

[B.Smeets]

You cannot get rid of it, I think, but you may set the Severity for this Alarm on Informational and it will no longer show in the Alarm Summary.

[Stephen Rodriguez]

You could try to go into the AP config on the WLC and check the box for pre-standard power.

Or you coudl disable CDP on the switch ports, but I have never cared for that option.

HTH,

Steve