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> Routing Protocols
> Neighbor States
> 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.
Odom, Wendell (2008) CCNA ICND2 Official Exam Certification Guide, Second Edition. Indianapolis: Cisco Press.