PoE module problem 3560

Unanswered Question
Apr 10th, 2012

Hi,

We are experiencing two of our layer 3 switches (3560 PoE and 3750 PoE) switches giving us problems with giving power to IP phones. These switches have an embedded PoE module and would previously give power to all IP phones on all its ports. Now all of a sudden over the past few months 6 of these ports have stopped powering phones. The phones are the same ie. 7911 and they take less than 15.4 W. We believe that the PoE module has started malfunctioning and has stopped giving power to all the ports. The port 'grants' power and then removes it. Below is a link showing all the messaged we receive on the terminal session. Please suggest what may be the problem and whether it is or is NOT a hardware fault with the PoE:

04:59:35: %ILPOWER-7-DETECT: Interface Gi0/25: Power Device detected: IEEE PD

04:59:36: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/25: PD removed

04:59:39: %ILPOWER-7-DETECT: Interface Gi0/25: Power Device detected: IEEE PD

04:59:40: %ILPOWER-5-POWER_GRANTED: Interface Gi0/25: Power granted

04:59:48: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/25: PD removed

04:59:54: %ILPOWER-5-POWER_GRANTED: Interface Gi0/25: Power granted

04:59:55: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/25: PD removed

05:00:01: %ILPOWER-5-POWER_GRANTED: Interface Gi0/25: Power granted

05:00:02: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/25: PD removed

05:00:08: %ILPOWER-5-POWER_GRANTED: Interface Gi0/25: Power granted

05:00:09: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/25: PD removed

05:00:15: %ILPOWER-5-POWER_GRANTED: Interface Gi0/25: Power granted

05:00:18: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/25: PD removed

05:00:24: %ILPOWER-5-POWER_GRANTED: Interface Gi0/25: Power granted

05:00:25: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/25: PD removed

05:01:01: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/29, changed state to down

05:01:02: %LINK-3-UPDOWN: Interface GigabitEthernet0/29, changed state to down

05:01:11: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/29: PD removed

05:01:17: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/29: PD removed

05:01:23: %ILPOWER-5-POWER_GRANTED: Interface Gi0/29: Power granted

05:01:23: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/29: PD removed

05:01:29: %ILPOWER-5-POWER_GRANTED: Interface Gi0/29: Power granted

05:01:30: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/29: PD removed

05:01:36: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/29: PD removed

05:01:42: %ILPOWER-5-POWER_GRANTED: Interface Gi0/29: Power granted

05:01:43: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/29: PD removed

05:01:49: %ILPOWER-5-POWER_GRANTED: Interface Gi0/29: Power granted

05:01:50: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/29: PD removed

05:01:57: %ILPOWER-5-POWER_GRANTED: Interface Gi0/29: Power granted

05:01:58: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/29: PD removed

05:02:04: %LINK-3-UPDOWN: Interface GigabitEthernet0/29, changed state to up

05:02:05: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/29, changed state to up

05:03:19: %ILPOWER-7-DETECT: Interface Gi0/30: Power Device detected: IEEE PD

05:03:20: %ILPOWER-5-POWER_GRANTED: Interface Gi0/30: Power granted

05:03:23: %LINK-3-UPDOWN: Interface GigabitEthernet0/30, changed state to up

05:03:24: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/30, changed state to up

05:03:41: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/30, changed state to down

05:03:41: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/30: PD removed

05:03:42: %LINK-3-UPDOWN: Interface GigabitEthernet0/30, changed state to down

Please suggest:

Thanks,

Vick.

I have this problem too.
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Leo Laohoo Tue, 04/10/2012 - 15:44

Good news is you've got a "G" so we could try running a TDR test.

1.  Command:  test cable tdr Interface GigabitEthernet0/30;

2.  Wait for approximately 5 to 7 seconds;

3.  Command:  show cable tdr Interface GigabitEthernet0/30; and

4.  Please post the output.

Reza Sharifi Tue, 04/10/2012 - 15:51

Hi,

This is very strange to see 3560s and 3750s going bad at the same time.  In addition to what Leo recommended, can you also check your power sources to make sure there is no power fluctuations?

Any recent changes in your power system?

Any configuration changes you have made recently?

HTH

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