Hi. We are in a cross-vCenter deployment so we plan on moving from V to T but simply running a new T infrastructure in parallel. We plan on actually just building brand new VCSA linked modes with v7 and new NSX-T on there, and we have powershell scripts that will powerOFF on current VCSA infrastructure VM, unregister, and re-register new VCSA, etc etc. We have done this before it works well for us as we do major upgrades in new sites.
We are trying to figure out how though bridge the V and T so that we can run the same logical subnets on both as we migrate. Unfortuneately our V is running OSPF, so L2 bridging will not work it seems.
I am not really the network expert on our install, but I am just trying to gather some resources for everyone to give us some ideas.