Having worked at both of these enterprise networking companies, I can honestly say that their resellers and channels don't overlap.

Re: 3Com on the block?

Sure, products do, but big deal. I have written on the need for consolidation among the 'Others' and this would certainly fit. However, networking (LAN switching & routing) is not growing much in North America. It's about China, and that's why Nortel needs to own it. Check out my blog at http://www.brockmann.com.