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Eigrp&summary

Have 4 distribution routers, A, A1, B and B1. These are connected by gig links. Access routers has links to A or B. If failure, access-routers will be "moved" to A1 or B1. The rest of the core, distribution is connecting to both A, A1, B and B1. The address space for the access routers is planned for summarization. Is it good design to implement a common ip eigrp summary at the links towards the core/distribution (the same ip summary eigrp statements for A, A1, B and B1) - and no summary between A, A1, B and B1?

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Re: Eigrp&summary

Summarization in EIGRP is a very good practice, especially in a big EIGRP network due to it's effect on the EIGRP Query process. There are benifits and draw backs to summarization. I will list some of each for you.

Pros:

Smaller routing table

Limits Query Range

Cons:

Potential routing failure

Suboptimal routing

Hope this helps,

Don

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