EIGRP
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What is EIGRP?
Enhanced Interior Gateway Routing Protocol (EIGRP) is a network protocol that enables routers to exchange information more efficiently than earlier network protocols, such as Interior Gateway Routing Protocol (IGRP) or Border Gateway Protocol (BGP).
To pass messages and facilitate session management, EIGRP uses five package types:
- HELLO packets : Sent out at regular intervals to facilitate the neighbor discovery process.
- QUERY packets : Used by a router to advertise that a route is in an active state and to request alternate path information from neighbors.
- REPLY packets : Sent after an entire QUERY packet has been received to acknowledge that packet’s receipt.
- REQUEST packets : Used to request specific information from one or more neighbors, similar to QUERY packets but sent unreliably – no notification if delivery fails.
- UPDATE packets : Convey information about destinations and their reachability.
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