Hi
I noticed that IBM is selling a s/w upgrade to their BNT 1/10G Ethernet switch that has a technology called VMready. It can track Virtual Machines as they migrate in the network and would allow configuring network settings for each Virtual Machine.
http://www-947.ibm.com/systems/support/supportsite.wss/docdisplay?brandind=5000008&lndocid=MIGR-5079...
I'm interested in this and wonder if others have tried it and if it could solve the concerns with network security when VMs migrate.