Cross vCenter xVCvMotion design

Hi Communities

I have been unable to get the networking requirements confirmed for this to work .

All these years we have been saying use a little fake non routed network for local site vmotion VMK1 .

Taking clients forward to vSphere 6 now , with all these share nothing , and cross vCenter vMotion , how will this work ?

IF your current VLANs are carried over from lets say ESX5.5 with local subnets for vmotion , how will cross DC vMotion work ?

Will it use VMK 0 's routable network if the network pinned for vMotion HOT traffic cannot be reached ?

Example Site A

VMK0 ESXI Management - 10.10.10.X with a valid GW , routable to 10.10.20 .X

VMK1 vMotion - 192.168.10.X - local VLAN , cannot get to site B

Guest networks - 10.100.100.10  , stretched

Example ESXI Management Site B

VMK0 - 10.10.20 .X with a valid GW , , routable to 10.10.10 .X

VMK1 vMotion - 192.168.20.X - local VLAN , cannot get to site B

Guest networks - 10.100.100.10  , stretched

Also in vsphere 6.0 , what is the official stand point for VSS and VDS for cross vCenter ?

Any thoughts ? KBs I have missed ?