Abstract
Enhanced Interior Gateway Routing Protocol (EIGRP) is a Cisco-proprietary, advanced distance-vector routing protocol that incorporates features from both distance-vector and link-state routing. EIGRP synchronizes routing tables on startup, and then only sends incremental updates when network changes occur, making it possible for EIGRP to use minimal network resources. EIGRP's capability of carrying subnet mask information in its update packets makes it possible for EIGRP to support classless addressing, variable-length subnet masks, and route summarization. EIGRP is highly scalable, and supports very large, and discontiguous networks. Large networks can be broken up into multiple autonomous systems (ASes) for more efficient routing and easier management. Routers configured with the same AS number will exchange information with each other. EIGRP is configured from two modes that include router configuration mode and interface mode. Global EIGRP parameters are configured in router configuration mode, and options such as summaries and metrics are configured per interface in interface mode. EIGRP does automatic route summarization to the classful boundaries. Manual route summarization can also be configured to shorten route tables and make them more efficient. Summary route addresses and masks are calculated by finding the common bits in the networks or network segments being summarized.
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