Routers running OSPF transition through several states before establishing an adjacency. The routers exchange different types of packets during these states. 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. The different states are the Down, Attempt, Init, 2-Way, Exstart, Exchange, Loading, and Full states, as described below:
- The Down state is the starting state for all OSPF routers. However, the local router may also show a neighbour in this state when no Hello . . .
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