Routing Mechanisms
Routing Mechanisms
4) OSPF Neighbors, Adjacencies, and Areas
B) OSPF Nieghbor Information
OSPF Neighbor up (Adjacency Establish)
Trade information with Neighbor
(bi-directional OSPF communication)
Topology information packaged in "link state announcement"
Need not exchange routing information
Announcements sent once (or once every 45 minutes), only updated if changed
If change sequence is:
change occurs
broadcast change
Run SPF algorithm
Install output into Forwarding Table (FIB)