OSPF Neighbor States

Down

Either the link to the neighbor is down, or this router is currently not receiving hello packets from the neighbor.

Init

The connection with this neighbor has been reset, and this router has received no answering hello packet from the neighbor to indicate that the neighbor has received a hello packet from this router.

2Way

This router received a hello packet from the neighbor that indicates the neighbor has received a hello packet from this router.

Exstart

The router is beginning to form an adjacency with this neighbor. This state occurs only between an designated router (DR) or backup designated router (BDR) and the other routers on the network segment they service. Neighbors that are neither designated routers nor backup designated routers never advance beyond the 2Way state with each other.

Exchange

The router is exchanging current LSA information with the neighbor.

Loading

The Router and the neighbor have finished exchanging information and are updating each other with the LSAs they need to share.

Full

One of the following three states indicating that the router and the neighbor are now up-to-date with each other, sharing fully identical LSA information.

Full This neighbor is not a designated router or backup designated router.

Full/DR This neighbor is the designated router.

Full/BDR This neighbor is the backup designated router.