There are two basic tools used to summarize routes in EIGRP: summary-address statements and distribute-list statements. These two methods provide significantly different approaches to limiting the routing updates to a summary of the information and each is uniquely useful. The best solution to a summarization problem is often a mixture of both approaches. One or both of these basic tools will be applied in all three layers—core, distribution, and access—in order to provide the maximum in summarization and, thus, the maximum in stability and scalability. Next, you can look at each tool in order to understand the pros and cons of each.
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