This chapter covers the following subjects:
Virtual Links: This section examines how engineers can use virtual links to connect separate parts of an area through another area to maintain the requirement that OSPF areas be contiguous.
OSPF over Frame Relay: This section examines the issues related to multipoint Frame Relay designs and configurations, in particular issues related to neighbor discovery or definition, whether the routers use a DR, and issues related to Frame Relay mapping.
This chapter contains two topics that at first glance seem to have little in common. The first topic, OSPF virtual links, gives network designers a tool to overcome an area design issue that occurs from ...