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EIGRP Network Design Solutions by Ivan Pepelnjak

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Chapter 8. Default Routes

In this chapter, you see how IOS implements default IP routing and the options you have for transporting default routes in EIGRP. The chapter concludes with a case study illustrating how the extensive use of default routes can introduce query boundaries in a network with no hierarchical addressing scheme.

Chapter 6, "EIGRP Route Summarization," and Chapter 7, "Route Filters," gave you powerful EIGRP scalability tools that have a single common drawback; they can usually be applied only in networks with a good, carefully thought-out IP addressing scheme. In networks that historically have had no hierarchical IP address structure, a different approach to network layering can be used:

  • Central (core) routers know every possible ...

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