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Routing EIGRP

Enhanced Interior Gateway Routing Protocol (EIGRP). Really just an enhanced version of IGRP A Cisco proprietary routing protocolCalled a hybrid protocol, but really just an advanced distance vector protocol.Fast convergenceVariable length subnet masksPartial updates - only when the metric for a route changesMultiple network layer support - IP, IPX, and AppleTalkA router running EIGRP stores all its neighbor's routing tables so that it can quickly adapt or alternate routes..

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Routing EIGRP

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    1. Routing & EIGRP CCNA 3.0

    3. EIGRP Concepts Every EIGRP router maintains a topology table for each configured network protocol. All learned routes to a destination are maintained in the topology table.

    5. IGRP & EIGRP They work together and routes are redistributed automatically RTB(config)# router igrp 2446 RTB(config-router)#network 192.168.1.0 RTB(config)#router eigrp 2446 RTB(config-router)# network 10.1.1.0 RTB(config-router)# network 172.16.1.0

    7. EIGRP Terminology

    8. Improvements from IGRP Neighbor discovery & recovery Use small “hello” packets to estab. adjacencies – sent every 5 seconds Dynamically learn routes that way Reliable Transport Protocol (RTP) A transport layer protocol that guarantees delivery order EIGRP is protocol independent, so has its own guarantee (compare to TCP)

    9. Improvements from IGRP Dual finite-state machine An algorithm that EIGRP uses to calculate routes Tracks all routes advertised by neighbors and uses a composite metric of each route to compare them Protocol-dependent modules Each module is responsible for all functions related to its specific routed protocol In other words, there is an IP PDM, an IPX PDM, an AppleTalk PDM, etc.

    10. Feasible Successors

    11. EIGRP Design Features

    12. EIGRP Technologies Neighbor discovery and recovery Reliable Transport Protocol DUAL finite-state machine algorithm Protocol-dependent modules By forming adjacencies, EIGRP routers: Dynamically learn of new routes that join their network Identify routers that become either unreachable or inoperable Rediscover routers that had previously been unreachable

    19. Select Routes If a link goes down, DUAL looks for an alternative route path, or feasible successor, in the topology table. If a feasible successor is not found, the route is flagged as Active, or unusable at present. Query packets are sent to neighboring routers requesting topology information. DUAL uses this information to recalculate successor and feasible successor routes to the destination.

    21. EIGRP Packet Types

    22. Data Structures

    24. EIGRP Routing Table

    27. Verifying EIGRP

    28. EIGRP debug Commands

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