Using Aggregation as a Tool
Summarization has already been introduced as a function that routers running RIP and IGRP perform when sending routing advertisements over interfaces whose IP addresses are in different major nets than the routes being advertised.
In the following scenario, aggregation will be manually configured to avoid sending unnecessary routing advertisements to certain routers. This can be done by using access lists to block the advertisement of certain subnets (see Figure 3-16).
Figure 3-16. Summarization reduces the content fo routing advertisements
Figure 3-16 also introduces a classic hierarchical design for building ...
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