Use the show ipv6 ospf neighbor command to verify that the router has formed an adjacency with its neighboring routers. If the router ID of the neighboring router is not displayed, or if it does not show as being in a state of FULL, the two routers have not formed an OSPF adjacency.

If two routers do not establish a neighbor adjacency, link-state information is not exchanged. Incomplete LSDBs can cause inaccurate SPF trees and routing tables. Routes to destination networks may not exist or may not be the most optimum path.

Figure 1 displays the neighbor adjacency of R1. For each neighbor, this command displays the following output:

Use the Syntax Checker in Figure 2 to verify the R2 and R3 neighbors using the show ipv6 ospf neighbor command.