When an OSPF router is initially connected to a network, it attempts to:
- Create adjacencies with neighbors
- Exchange routing information
- Calculate the best routes
- Reach convergence
OSPF progresses through several states while attempting to reach convergence:
- Down state
- Init state
- Two-Way state
- ExStart state
- Exchange state
- Loading state
- Full state
Click the blue boxes in the figure for more information.