EIGRP - EIGRP CCNA Exploration Semester 2 Chapter 9 4 Oct...

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4 Oct 2009 S Ward Abingdon and Witney College 1 EIGRP CCNA Exploration Semester 2 Chapter 9
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4 Oct 2009 S Ward Abingdon and Witney College 2 Topics Background and history of EIGRP Features and operation of EIGRP Basic EIGRP configuration EIGRP’s composite metric Concepts and operation of DUAL More EIGRP configuration commands
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4 Oct 2009 S Ward Abingdon and Witney College 3 RIP v1 RIP v2 IGRP EIGRP Routing protocols Interior Exterior Distance vector Link state OSPF IS-IS EGP BGP
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4 Oct 2009 S Ward Abingdon and Witney College 4 EIGRP Cisco proprietary – only on Cisco routers Developed from the older IGRP (classful) EIGRP is classless, supports VLSM, CIDR Distance vector But has some features more typical of link state Has a composite metric
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4 Oct 2009 S Ward Abingdon and Witney College 5 EIGRP atypical features Reliable Transport Protocol (RTP) Bounded Updates Diffusing Update Algorithm (DUAL) Establishing Adjacencies Neighbor and Topology Tables
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4 Oct 2009 S Ward Abingdon and Witney College 6 RIP, IGRP, EIGRP RIP is a typical distance vector routing protocol using hop count as metric, max 15. IGRP was introduced to have a better metric and not be restricted to 15 hops. It is a typical distance vector routing protocol, and classful. EIGRP was introduced to be classless and with other enhancements for better performance.
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4 Oct 2009 S Ward Abingdon and Witney College 7 IGRP EIGRP Bellman-Ford algorithm Ages out routing entries Sends periodic updates Keeps best routes only Slow convergence with holddown timers Diffusing Update Algorithm (DUAL) Does not age out entries No periodic updates Keeps backup routes Faster convergence, no holddown timers
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4 Oct 2009 S Ward Abingdon and Witney College 8 Faster convergence Holddown timers slow down convergence but are needed to avoid routing loops. Loops can occur using the Bellman-Ford algorithm EIGRP uses DUAL which is unlikely to produce routing loops. Therefore it does not need to rely on holddown timers and can converge more quickly.
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4 Oct 2009 S Ward Abingdon and Witney College 9 Encapsulation Frame header IP packet header EIGRP packet header Type/ length/ value data EIGRP Parameters, IP Internal Routes, IP External Routes. Opcode AS number Protocol field 88 destination address multicast 224.0.0.10. If Ethernet, destination MAC address multicast 01-00-5E-00-00-0A.
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4 Oct 2009 S Ward Abingdon and Witney College 10 EIGRP packet header Opcode specifies packet type: Update, Query, Reply, Hello Autonomous system (AS) number specifies the EIGRP process. Several can run at the same time. Other fields allow for reliability if needed. EIGRP packet header
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4 Oct 2009 S Ward Abingdon and Witney College 11 EIGRP TLV field Values needed for calculating metric K2 value, default 0, weighting for K4 value, default 0, weighting for K5 value, default 0, weighting for Type/ length/ value data
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4 Oct 2009 S Ward Abingdon and Witney College 12 EIGRP TLV field
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This note was uploaded on 01/12/2012 for the course NETWORKING 2083 taught by Professor Cathymarak during the Winter '12 term at NorthWest Arkansas Community College.

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EIGRP - EIGRP CCNA Exploration Semester 2 Chapter 9 4 Oct...

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