LSAs and the OSPF Link-State Database
Lesson 1: Overview of OSPF LSA Types
Every router that connects to a given OSPF area should learn the exact same topology data. Each router stores the data, composed of individual link-state advertisements (LSA), in its own copy of the link-state database (LSDB). Then, the router applies the Shortest Path First (SPF) algorithm to the LSDB to determine the best (lowest-cost) route for each reachable subnet (prefix/length).
When a router uses SPF to analyze the LSDB, the SPF process has some similarities to how humans put a jigsaw puzzle together—but without a picture of what the puzzle looks like. Humans faced ...
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