We have users buying their own 8-port D-link/Linksys/Netgear mini hub to connect multiple network devices. Is there an easy way to find switch ports that have multiple MACs associated with them, excluding uplink ports? Keep in mind that we have 1000 switches spread across 350 offices. We have CiscoWorks RME 4.0 to use. Any free tool that can perform such task?