A read-create IP address, defaulting to 0.0.0.0, meaning no virtual link, specifying the loopback interface address of the remote network element that terminates an OSPF virtual link through this normal-type area. OSPF requires every area to logically attach to the backbone Area 0, so this lets an admin create a virtual link connecting a non-contiguous area back to Area 0 through this area, which must be configured symmetrically on both endpoint network elements and cannot be set up through stub, totallyStub, nssa, or nssaTotallyStub areas. An admin reconnecting a physically disconnected area back to the OSPF backbone would set this object to the loopback address of the remote NE, and configure the matching virtual link on that remote NE as well.