Thanks to the kind folks here, I've got PRTG running on 2008R2 (along with wonky radius server, but that's a separate issue), via a plain etherswitch (haven't tried the Swouter yet). It's capturing all syslogs, SNMP traps, and monitors all my devices, even the Virtualbox guests. The only thing I don't know how to get working (and monitored) is the "HOST" that simulated 9 PCs.
Can I connect to an switch 7 times, then use the last connection to trunk it to the other etherswitch? How do I know if they're running? I'm not seeing much traffic coming to or from that switch.
Oh, and for those keeping track, I've gotten Linux Mint 17 (with TFTP server), Haiku, Plan 9, MS-DOS 6.22, NT3 SP6a, Win98SE, and 2008R2 enterprise (with PRTG and radius) running on Vbox guests, and all communicating. If anybody wants me to do a HOWTO, I'll be down for that, as long as I can get and editor/punch up writer.
I *might* throw in the huawei eNSP sim, and Amiga Forever, but by big thing right now is getting my 3745 IPvoice router working, and installed with CME 7, as well as trying to get those "skinny" softphones integrated into the topology. I could use advice on how to get that to work. I'm trying the IPBLUE MultiLab at the moment.