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Non-Fully Adjacent OSPF Routers


Some routers do not attempt to become fully adjacent. In particular, on interfaces in which a DR is elected, routers that are neither a DR or a BDR become neighbors, but they do not become fully adjacent. These non-fully adjacent routers do not directly exchange LSAs. Also, the "show ip ospf neighbor" command on such a router lists these neighbors in a "two-way" state as the normal stable neighbor state, and "full" as the normal stable state for the DR and BDR.







References

Odom, Wendell (2008) CCNA ICND2 Official Exam Certification Guide, Second Edition. Indianapolis: Cisco Press.