I've got a problem where random users are plugging their voice and data ports on their Avaya phones straight into the switches, instead of connecting the data port to a PC. This I believe creates a layer 2 loop.
My problem is how can I track this loop down? What commands do I have available on my 3560 switches and what should I be observing?
Do I need to use wireshark? If so how do I monitor my switch given that I could be having up to a max of a Gb of traffic passing the switch but I'm connected on a fastethernet port?
I have logging enabled but I couldn't see any messages that stated that. Although on this occassion when I had the problem I was lucky enough to physically trace the problem phone, but I'd like to get the switches to tell me.
Take a look at the commands used in the cisco-phone SmartPort macro "sh parser macro". If nothing else, you want bpduguard on those access ports to keep you from looping up. You can go back later on a port that's been disabled and "sh int status err-disabled" to see why a port was taken down.
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