Hey Bill,
They sure do support this. ISL is a great technology, however, I would consider takin' a look at 802.1Q VLANs. On the mean streets of Ethernet will call this: Dot1Q, then we flash a "q" hand sign to see who is down with the scene yo... Dot1Q (I'm chillin') is a smaller frame type (1518 vs 1578) interops with other vendors and emcompasses 802.1P for QoS. It's way most folks are seperating their broadcast domains now. So come on over to the "q" side...
