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EIGRP Network Design Solutions by Ivan Pepelnjak

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Chapter 7. Route Filters

EIGRP route summarization, introduced in Chapter 6, "EIGRP Route Summarization," gives you a versatile hierarchical tool that can make an EIGRP network extremely scalable. Whenever the addressing scheme or the network design deviates from the hierarchical design, summarization can give suboptimal results or even lead to partial connectivity in the network, as you'll see in the first case study. This chapter introduces additional scalability tools—EIGRP route filters and prefix lists —that can provide scalability even in some networks where the summarization cannot be properly deployed due to deviations from a hierarchical design.

Case Study—Partial Connectivity over ISDN Backup

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