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OSPF Neighbor States and Their Meanings


Neighbor State Meaning
Down A known neighbor is no longer reachable, often because of an underlying interface failure.
Init An interim state in which a Hello has been heard from the neighbor, but that Hello does not list the router's RID as having been seen yet.
Two-Way The neighbor has sent a Hello that lists the local router's RID in the list of seen routers, also implying that neighbor verification checks all passed.
Full Both routers know the exact same LSDB details and are fully adjacent.







References

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