Neighbor States
There are 8 states for OSPF neighbors:
- Down – no Hello packets have been received from the neighbor.
- Attempt – neighbors should be manually configured for this one. It only applies to NBMA networks and shows no recent information received from the neighbor.
- Init – Hello packets received from other routers, but the local router hasn’t seen itself in the other routers’ Hello packets. A bi-directional connection hasn’t yet been established.
- 2Way – Hello packets with the router’s own Router ID in the Neighbor field is received. Bi-directional traffic communications have now been established.
- ExStart – Master/Slave relationship has been established to form an adjacency by exchanging DD (Database Description) packets. The router with the highest Router ID, becomes Master.