Analyzing the Network Core for Summarization
The network core in EIGRP has similar requirements to those presented by OSPF and IS-IS. Adequate redundancy and bandwidth must be provided in the core in order to provide rapid, reliable delivery of packets presented to it from the distribution layer and destined to common resources or other distribution layer routers. The core should present as little impediment to the delivery of packets as the geographic distances and budgets will allow. Network designs are much more scalable if it doesn't matter where a packet enters the core from the distribution layer. The core should appear to be a fast cloud that the distribution layer uses to reach common resources and other distribution layer routers.
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