6.8 Virtual Links  
  6.8.2 Configuring virtual links  
To configure a virtual link, perform the following steps:
  1. Configure OSPF, as described previously in the "Using and Configuring OSPF Multiarea Components" section.
  2. On each router that will use the virtual link, create the ’virtual link’ configuration. The routers that make the links are the ABR that connects the remote area to the transit area and the ABR that connects the transit area to the backbone area.

Router(config-router)#area area-id virtual-link router-id

If the router ID of the neighbor is not known, telnet to it and type the show ip ospf command.