poe inline power flapping

Unanswered Question
Nov 9th, 2009

What could cause the following to happen? This is occuring on 3 separate switches connecting non-cisco ip phones.

WS-C2960-24PC-L Version 12.2(44)SE3

Oct 29 13:04:39: %ILPOWER-7-DETECT: Interface Fa0/17: Power Device detected: IEEE PD

Oct 29 13:04:40: %ILPOWER-5-POWER_GRANTED: Interface Fa0/17: Power granted

Oct 29 13:04:43: %LINK-3-UPDOWN: Interface FastEthernet0/17, changed state to up

Oct 29 13:04:45: %ILPOWER-5-IEEE_DISCONNECT: Interface Fa0/17: PD removed

Oct 29 13:04:46: %LINK-3-UPDOWN: Interface FastEthernet0/17, changed state to down)

Oct 30 10:11:35: %ILPOWER-7-DETECT: Interface Fa0/17: Power Device detected: IEEE PD

Oct 30 10:11:36: %ILPOWER-5-POWER_GRANTED: Interface Fa0/17: Power granted

Oct 30 10:11:38: %ILPOWER-5-IEEE_DISCONNECT: Interface Fa0/17: PD removed

Oct 30 10:11:40: %ILPOWER-7-DETECT: Interface Fa0/17: Power Device detected: IEEE PD

Oct 30 10:11:41: %ILPOWER-5-POWER_GRANTED: Interface Fa0/17: Power granted

Oct 30 10:11:44: %LINK-3-UPDOWN: Interface FastEthernet0/17, changed state to up

Available:370.0(w) Used:128.8(w) Remaining:241.2(w)

Interface Admin Oper Power Device Class Max

(Watts)

--------- ------ ---------- ------- ------------------- ----- ----

Fa0/1 auto on 7.0 Ieee PD 2 15.4

Fa0/2 auto on 7.0 Ieee PD 2 15.4

Fa0/3 auto on 7.0 Ieee PD 2 15.4

Fa0/4 auto on 7.0 Ieee PD 2 15.4

Fa0/5 auto off 0.0 n/a n/a 15.4

Fa0/6 auto on 7.0 Ieee PD 2 15.4

Fa0/7 auto on 7.0 Ieee PD 2 15.4

Fa0/8 auto on 7.0 Ieee PD 2 15.4

Fa0/9 auto on 7.0 Ieee PD 2 15.4

Fa0/10 auto on 7.0 Ieee PD 2 15.4

Fa0/11 auto on 7.0 Ieee PD 2 15.4

Fa0/12 auto on 7.0 Ieee PD 2 15.4

Fa0/13 auto off 0.0 n/a n/a 15.4

Fa0/14 auto off 0.0 n/a n/a 15.4

Fa0/15 auto off 0.0 n/a n/a 15.4

Fa0/16 auto on 15.4 Ieee PD 3 15.4

Fa0/17 auto on 15.4 Ieee PD 3 15.4

Fa0/18 auto off 0.0 n/a n/a 15.4

Fa0/19 auto off 0.0 n/a n/a 15.4

Interface Admin Oper Power Device Class Max

(Watts)

--------- ------ ---------- ------- ------------------- ----- ----

Fa0/20 auto on 7.0 Ieee PD 2 15.4

Fa0/21 auto off 0.0 n/a n/a 15.4

Fa0/22 auto on 7.0 Ieee PD 2 15.4

Fa0/23 auto off 0.0 n/a n/a 15.4

Fa0/24 auto on 7.0 Ieee PD 2 15.4

I have this problem too.
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Leo Laohoo Mon, 11/09/2009 - 13:30

Sounds like the phones do not like CDP. Is CDP enabled on both the switch and the phones? Have you tried to set the power level required of the phone?

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