OSPF

• Dynamic Routing Protocol for IP Networks
• Link State Protocol
• Group of Interior Gateway Protocol
• Operates withing a single Autonomous System
• Conifgured with Wildcard Mask
• Process ID - Uses Dijkstra’s algorithm
• Network Types – point to point, and routers that are directly connected

OSPF Tables

Neighbours Table - shows all neighbours adjacent to router.

Topology Table - shows all route entries learned by the router.

Routing Table – shows the best route to get to other points on the network.

DR Selection Process

OSPF chooses the designated router (DR) on a LAN as the device that has the highest IP address. If routers are added or removed from the LAN, or if a router gains an interface with a higher address than that of the existing DR, the DR likely will change if the DR or backup designated router (BDR) fails.