Routers running OSPF transition through several states before establishing an adjacency. These different states are the Down, Attempt, Init, 2-Way, Exstart, Exchange, Loading and Full states. The preferred state for an OSPF adjacency is the Full state. This state indicates that the neighbors have exchanged their entire databases and both have the same view of the network. While the Full state is the preferred adjacency state, it is possible that during the adjacency establishment process, the neighbors get 'stuck' in one of the other states. For this reason, it is important to understand what to look for in order . . .
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