Chapter 21. Route Summarization

Route summarization tools allow engineers to advertise one route that replaces several smaller routes, with the new route matching the same range of addresses. Doing so alleviates some of the waste: wasted effort, bandwidth, RAM, and CPU.

This chapter first examines manual route summarization concepts. The concepts rely on math that uses the same principles as subnetting math, and it relies on a good subnetting plan that assigns subnets in anticipation of future attempts to do route summarization. This first section of the chapter shows the math and the concepts. The second half of the chapter then shows a systematic way to find out the summary route that is the best summary route to create when configuring summary ...

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