Hi Shamy, connectivity would need to be via the physical network if the portgroups are on different VDS's as the traffic would be hitting the uplinks to leave the VDS and hitting the physical network.
John Hague
http://linkedin.com/in/john-hague | twitter @jhague10
VCIX-DCV | VCP-DCV 3/4/5/6 | VCP6-NV | VCP7-CMA | VCAP7-CMA Design