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?