we are moving like 12 of these from one datacenter to another and basically sending them via v motion. something interesting. originating network is 172.16.21.xxx and new network is 172.17.31.xxx when we move them and change the ip address it does not ask for a new plds key or 30 day grace period. it basically allows the ip address change and new vlan without bouncing anything. same similar subnet thing? I don't know. anyway just sharing in the event you guys are ever moving Datacenters and need to migrate slowly