Understanding OSPF Virtual Link Concepts
An OSPF virtual link allows two ABRs that connect to the same nonbackbone area to form a neighbor relationship through that nonbackbone area, even when separated by many other routers and subnets. This virtual link acts like a virtual point-to-point connection between the two routers, with that link inside area 0. The routers form a neighbor relationship, inside area 0, and flood LSAs over that link.
For example, consider the topology in Figure 7-10, which shows an example of the third of the three cases described in the beginning of this section. In this case, two companies merged. Both companies had a small office in the same city, so for expediency’s sake, they connected the two former enterprise internetworks ...
Get CCNP Routing and Switching ROUTE 300-101 Official Cert Guide now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
