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Optimal Routing Design by Alvaro Retana, Don Slice, Russ White

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Appendix A. EIGRP for IP Basics of Operation

Enhanced Interior Gateway Routing Protocol (EIGRP) is an advanced distance vector protocol that offers many advantages:

Minimal use of network resources in normal operation—EIGRP only transmits small hello packets during normal operation to maintain neighbor relationships; it has no periodic routing updates (flooding of the routing table to neighbors).

Restricted use of network resources when reacting to network topology changes—EIGRP only transmits information about what has changed and restricts (paces) the rate at which it sends packets so that it will not overwhelm a link.

Rapid convergence—EIGRP converges quickly during topology changes, primarily because it computes all loop-free paths ...

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