01-08-2008 05:54 AM - edited 03-05-2019 08:20 PM
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
this:
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.
01-09-2008 07:19 PM
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.
HTH,
__
Edison.
01-10-2008 12:10 AM
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.
01-10-2008 05:54 AM
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 ?
__
Edison.
01-10-2008 07:36 AM
>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.
01-10-2008 07:40 AM
Just to be clear, I'm referring to electrical grounding: http://en.wikipedia.org/wiki/Electrical_grounding
HTH,
__
Edison.
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