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Refer to the exhibit. The routers in the topology are running OSPF over the Ethernet network. Router "R2" hasn't established a FULL state adjacency with router with Neighbor ID 192.168.120.4. What is the cause for this behavior?
The Hello packets that include their own Router ID in the neighbor field have not yet been received.
The routers are forwarding Link State Advertisements "LSA" between each other. Once it is finished the state will turn to FULL.
The router R2 and the Neighbor ID 192.168.120.4 are exchanging Database information.
Non-DR and Non-BDR Routers don't need to establish a FULL state adjacency. This is normal behavior.
Router R4 is a DR (Designated Router) therefore it will form FULL state relationship with all its neighbors. The state between non-Designated Routers and non-Backup Designated Routers or sometimes called DROTHER (Designated Router Other) will remain in 2WAY state. Whenever a router sees itself in a neighbor hello packet, it will confirm bidirectional communication and transition the neighbor state to 2-way. From this point the routers will elect DR and BDR. All other routers that are not DR and BDR will only form FULL adjacency with DR and/or BDR.
http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13683-11.html
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