Routing 2 Chapter 9

Routing 2 Chapter 9 - EIGRP CCNA Exploration Semester 2...

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11 May 2009 S Ward Abingdon and Witney College 1 EIGRP CCNA Exploration Semester 2 Chapter 9
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11 May 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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11 May 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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11 May 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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11 May 2009 S Ward Abingdon and Witney College 5 EIGRP atypical features Reliable Transport Protocol (RTP) Diffusing Update Algorithm (DUAL) Establishing Adjacencies Neighbour and Topology Tables
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11 May 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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11 May 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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11 May 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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11 May 2009 S Ward Abingdon and Witney College 9 Metrics Bandwidth is the lowest configured bandwidth on any interface on the route. It is not an actual measured value. You should always configure a bandwidth value on an interface when using EIGRP, otherwise a default is used.
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11 May 2009 S Ward Abingdon and Witney College 10 Metrics Delay is calculated as the sum of delays from source to destination in units of 10 microseconds.
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11 May 2009 S Ward Abingdon and Witney College 11 Network layer protocols EIGRP can support more than one network layer protocol, e.g. IP, IPX, Appletalk.
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Routing 2 Chapter 9 - EIGRP CCNA Exploration Semester 2...

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