How can I locate a hub on my Catalyst 5000 Switch?
I am trying to locate illegal network devices, hubs, on my network. I know I can use the "show cam dynamic" and sift through all the MAC addresses associated with the ports, but are there any other ways to make this easier?
Re: How can I locate a hub on my Catalyst 5000 Switch?
Look for ports or interfaces that have multiple MAC addresses, indicating that there is either a hub or switch downstream. (Be careful not to confuse multicast MAC addresses with workstation network adapter MAC addresses.)
Here's an interesting tool that might come in handy, and make this task a little easier. The Switch Port Mapper, included in SolarWinds's Engineer's Edition toolset, makes the following claim:
"The Switch Port Mapper is unique in the industry in that it is even capable of discovering downstream unmanageable (dumb) hubs and discover the devices connected to them. With the Switch Port Mapper by SolarWinds you may never need to trace a cable again."
Follow the link, and run the on-line demo, very informative.
This document gives several answers on frequently asked questions for PFRv3 channel state behavior.
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