3560 PoE destroy other port

Unanswered Question
Jan 8th, 2008

We have a strange problem with a 3560-8PC router

(c3560-advipservicesk9-mz.122-37.SE1). Which kills three times the

uplink Port from a 2960. It looks like a power over ethernet problem

which accour if you power off the 2960. The port is configured like


interface FastEthernet0/1

power inline never

spanning-tree portfast

service-policy input CLASSIFY

Is anyone else expect the same problem ? As far as I know there was a

known bug befor 12.2.37 and it should be fixed in this release.

I have this problem too.
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Edison Ortiz Wed, 01/09/2008 - 19:19

Do not enable spanning-tree portfast on switchports connected to another switch. Your switchport may be going to err-disabled when it receives the BPDU from the 2960.




ehsolnet Thu, 01/10/2008 - 00:10

I never see that happen, but thank you for the hint. The problem is that the other port isn't err-disabled .. the port is destroyed and you have to exchange the 2960.

Edison Ortiz Thu, 01/10/2008 - 05:54

When you said destroyed you meant the port will be completely dead hardware-wise?

I'm sorry I didn't take your original post literally. It seems there is a problem with the cabling there. I can only think of electrical pulses causing this kind of damage. Are you grounding all devices ?



ehsolnet Thu, 01/10/2008 - 07:36

>When you said destroyed you meant the port will be completely dead hardware-wise?

Yes, we had to replace the 2960er Switch, the port was completely dead.

We also replaced the 3560er just to be shure. I will ask the customer if the grounding is on the same level on all devices.


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