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Implementing Cisco IP Routing (ROUTE) Foundation Learning Guide: (CCNP ROUTE 300-101) by Rick Graziani, Bob Vachon, Diane Teare

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Optimizing OSPF Behavior

Scalability, improved CPU and memory utilization, and the ability to mix small routers with large routers are all the benefits of using proper route summarization techniques. A key feature of the OSPF protocol is the ability to summarize routes at area and autonomous system boundaries.

Route summarization is important because it reduces the amount of the OSPF LSA flooding and the sizes of LSDBs and routing tables, which also reduces the memory and the CPU utilization on the routers. An OSPF network can scale to very large sizes, partially because of the route summarization.

The OSPF protocol defines several special-case area types, including stub areas, totally stubby areas, and NSSAs. The purpose of all three types ...

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