quote of the day... odom

wendell, you have the floor:

Neighbors—Two routers that share a common data link, that exchange Hello messages, and the Hellos must match for certain parameters.


Adjacent (fully adjacent)—Two neighbors that have completed the process of fully exchanging DD and LSU packets directly between each other.

and further (this is the big one)

if a DR is elected, the election occurs after the routers have become
neighbors, but before they send DD packets and reach the ExStart neighbor state. When an OSPF router reaches the 2-way state with the first neighbor on an interface, it has already received at least one Hello from that neighbor.

translation:

after neighbors but before adjacency:

hellos begin at init...

two-way is established upon hello reception NEIGHBORS

exstart determines master/slave

exchange (exchange dd)

loading compare dd... bring lsa's up to speed with lsr's... ACKNOWLEDGE

full = synchronization