Configuring the Enhanced Interior Gateway Routing Protocol

Dec 25, 2006

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Building Scalable Cisco Internetworks (BSCI) (Authorized Self-Study Guide), 3rd Edition

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Summary

In this chapter, you learned about Cisco's own EIGRP, an advanced distance vector routing protocol. The chapter presented the following topics:

Features of EIGRP, including fast convergence, VLSM support, use of partial updates, multiple network layer support, seamless connectivity across all data link layer protocols and topologies, sophisticated metric, and use of multicast and unicast.
EIGRP's underlying processes and technologies—neighbor discovery/recovery mechanism, RTP, DUAL finite state machine, and protocol-dependent modules.
EIGRP terminology, including EIGRP's tables—neighbor table, topology table, and routing table; the advertised distance and the feasible distance; and the successor and feasible successor.
The five EIGRP packet types: hello, update, query, reply, and acknowledgment.
Passive and active routes.
The EIGRP metric calculation, which defaults to bandwidth + delay.
Basic EIGRP configuration commands.
EIGRP summarization, EIGRP equal-cost and unequal-cost load balancing, and EIGRP operation in WAN environments.
Configuring, verifying, and troubleshooting EIGRP MD5 authentication.
EIGRP scalability factors and EIGRP use in an enterprise network.
Verifying and troubleshooting EIGRP.

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