BSCI - OSPF - Adjacency requirements

For an OSPF adjacency to form the 2 neighbors must agree on several parameters within the Hello Packet before the adjacency can form. These are:

i) Each must have a unique Route-ID
ii) Each must be in the same Area
iii) Authentication setting must match
iv) Timers must match.

One other parameter that must be agreed upon is the router priority for DR/DBR elections.