OSPF routers transition through several phases before they establish a neighbor adjacency. The routers exchange different types of packets during these phases. This exchange of messages allows all routers that establish an adjacency to have a consistent view of the network. Additional changes to the current network are simply sent out as incremental updates. Routers running OSPF transition through several states before establishing and adjacency. These different states are the Down, Attempt, Init, 2-Way, Exstart, Exchange, Loading and Full states.
- The Down stateis the starting state for all OSPF routers. However, the local router may also show . . .
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