Choosing the Best Summary Routes
Manual route summarization works best when the subnetting plan considered summarization in the first place. For example, the earlier examples with Figures 21-1 and 21-2 used a well-thought-out plan, with the engineers only using subnets beginning with 10.2 for subnets off R2 and subnets that begin with 10.3 for subnets off R3.
When creating a summary route, some network engineer types a subnet and mask in a configuration command. Many combinations of subnet/mask can work for a given need; however, not all those options are the best option. The word best, when applied to choosing what summary route to configure, means that the summary should include all the subordinate subnets, but with as few other addresses ...
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