The purpose to form adjacency is so that each router in that area is aware of the networks the other router is connected to. The conecpts are quite difficult to get you head around once you first see it but i went off and read some extra stuff to try and understand it more and cam across the link below if i remember debug ip ospf adjacency . 2. Routers in the 2-Way state are neighbours routers in ExStart, Exchange, Loading, and Full are adjacent. I did clear the processes on both R1 and R4 like Ramon mentioned, but adjacency is still not forming on the segment. The Adjacency table is a seperate entitity to the FIB table. Here my inputs regarding your comment. . Neighbourships will send hello messages and process received hello messages. When packets need to be forwarded to a specific host, the adjacency database is gleaned for the specific prefix.

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