http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800949f7.shtml#trouble_init_state
the init state indicates that router-2 sees hello packets from the neighbor, but two-way communication has not been established. A Cisco router includes the Router IDs of all neighbors in the init (or a higher) state in the neighbor field of its hello packets. For two-way communication to be established with a neighbor, a router also must see its own Router ID in the neighbor field of the neighbor's hello packets. In other words, a router with a neighbor in the init state has received hello packets from the neighbor but has not seen its own Router ID in the neighbor's hellos. In this case, if the router does not receive four consecutive hellos, it tears down the session and the OSPF adjacency goes down.
the init state indicates that router-2 sees hello packets from the neighbor, but two-way communication has not been established. A Cisco router includes the Router IDs of all neighbors in the init (or a higher) state in the neighbor field of its hello packets. For two-way communication to be established with a neighbor, a router also must see its own Router ID in the neighbor field of the neighbor's hello packets. In other words, a router with a neighbor in the init state has received hello packets from the neighbor but has not seen its own Router ID in the neighbor's hellos. In this case, if the router does not receive four consecutive hellos, it tears down the session and the OSPF adjacency goes down.
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