Choosing the Best OSPF Routes

ImageLesson 7: Shortest Path First Algorithm

All this effort to define LSA types, create areas, and fully flood the LSAs has one goal in mind: to allow all routers in that area to calculate the best, loop-free routes for all known subnets. Although the database exchange process might seem laborious, the process by which SPF calculates the best routes requires a little less thought, at least to the level required for the CCNP ROUTE exam. In fact, the choice of the best route for a given subnet, and calculated by a particular router, can be summarized as follows:

Analyze the LSDB to find all possible routes to reach the ...

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