3com 4500 / finding other switches

Hello all

I have a few 3Com 4500G/V5.01.03s56 that don't appear connected on the "netmap" (NAV 3.5.6), although we know they're connected to other switches that do appear on netmap

Is there any way I can make those 3com appear connected on netmap?

Another question: is there any way to detect switch candidates analysing NAV's database? I'm trying to configure all switches into NAV, but there are many and the lists I have may be incomplete. Another reason to do this analysis regularly might be to detect "rogue" switches connected onto the network

best regards, thanks, João Pagaime