11.1 Description of basic OSPF functions

OSPF (Open Shortest Path First) is a routing protocol that uses Dijkstra's algorithm to calculate the shortest path to known destinations, based on a topology map constructed from information about the state of links between routers.

<Structure of this section>

• 11.1.1 OSPF Features

• 11.1.2 OSPF functions

• 11.1.3 Routing algorithm

• 11.1.4 LSA ads

• 11.1.5 Introduction of external AS routes

• 11.1.6 Route selection criteria

• 11.1.7 Equal-cost multipath

• 11.1.8 Notes