LSA Type 3: Summary LSA
Lesson 4: Type 3 LSA: Summary
OSPF areas exist in part so that engineers can reduce the consumption of memory and compute resources in routers. Instead of having all routers, regardless of area, know all Type 1 and Type 2 LSAs inside an OSPF domain, ABRs do not forward Type 1 and Type 2 LSAs from one area into another area, and vice versa. This convention results in smaller per-area LSDBs, saving memory and reducing complexity for each run of the SPF algorithm, which saves CPU resources and improves convergence time.
However, even though ABRs do not flood Type 1 and Type 2 LSAs into other areas, routers still need to learn ...
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