book

EIGRP Network Design Solutions

Name: EIGRP Network Design Solutions
Author: Ivan Pepelnjak
ISBN: 9781578701650

by Ivan Pepelnjak

October 1999

Intermediate to advanced

384 pages

8h 22m

English

Cisco Press

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Copyright
Dedications
About the Author
About the Technical Reviewers
Acknowledgments
Introduction
ObjectivesIntended AudienceOrganizationAdditional Background and Reference InformationApplicability of EIGRP
I. EIGRP Technology
1. EIGRP Concepts and Technology
EIGRP Concepts—Metrics and DistancesInitial IP EIGRP ConfigurationEIGRP Concepts—Metrics and DistancesComputing a Composite MetricComputing Vector MetricDUAL—The Heart of EIGRPDUAL TerminologyUpstream and Downstream RoutersReported Distance and Feasibility DistanceSimple DUAL Operation—Adding New RoutesDUAL Behavior on Route LossLocal ComputationDiffusing ComputationStarting a Diffusing ComputationReceiving a Query Packet and Responding to ItFinishing a Diffusing ComputationA Diffused Computation ExampleMonitoring Diffusing ComputationStuck-in-Active RoutesSummary
2. Advanced EIGRP Concepts, Data Structures, and Protocols
EIGRP Transport Mechanisms and ProtocolsEIGRP Encapsulation Methods and Packet FormatHello ProtocolMonitoring EIGRP Hello ProtocolReliable Transport ProtocolSequence Numbers and AcknowledgmentsRetransmissions and Retransmission TimersMixed Multicast/Unicast OperationEIGRP NeighborsDiscovering New NeighborsInitial Topology Table ExchangeAdjacency Resets—Causes and ConsequencesMonitoring EIGRP NeighborsEIGRP Topology TableEIGRP Topology Table ContentsInternal EIGRP RoutesExternal Routes and Additional Route AttributesMonitoring Network Convergence through the EIGRP Topology TableAnomalies in EIGRP Topology TablesBuilding Routing Tables from EIGRP Topology TablesAdministrative Distance of EIGRP RoutesEIGRP Variance and Its Influence on Traffic Load SharingValid and Invalid Examples of Using VarianceSummary
3. IPX EIGRP
IPX EIGRP Configuration and Route RedistributionIntegration of IPX RIP Metrics into IPX EIGRP and IPX Route SelectionIPX RIP RefresherRedistribution between IPX RIP and IPX EIGRPSample Redistribution ScenariosIPX SAP IntegrationBackward Compatibility of IPX EIGRP and IPX SAPSummary
4. AppleTalk EIGRP
AppleTalk EIGRP Configuration and Route RedistributionIntegration of RTMP and AppleTalk EIGRP and AppleTalk Route SelectionRTMP RefresherRedistribution between RTMP and AppleTalk EIGRPSample Redistribution ScenariosScenario 1—Concurrent RTMP and AppleTalk OperationScenario 2—RTMP Running on LAN Interfaces OnlyScenario 3—Running RTMP on Some WAN LinksScenario 4—Discontinuous AppleTalk EIGRP DomainSummary
II. Designing Enterprise EIGRP Networks

5. Scalability Issues in Large Enterprise Networks
Case Study 1—Large Enterprise Network Experiencing Meltdown SituationsWhy Did DUAL-Mart Fail?Case Study SummaryQuery Boundaries—What They Are and Why They Are UsefulMonitoring the Stability of Your EIGRP NetworkCase Study 2—Diffused Computation in Hierarchical NetworksRemote Office PVC FailureShadow PVC FailurePrimary PVC Failure with Traffic ReroutingSummary
6. EIGRP Route Summarization
Case Study—Connectivity Loss Following Private IP Address DeploymentAutosummarizationQuery Boundaries with AutosummarizationConclusionBenefits and Drawbacks of AutosummarizationManual Per-Interface SummarizationWhy Do We Need a Summary Route to Null 0?EIGRP Query Boundary with Per-Interface SummarizationCase Study—EIGRP Behavior in DUAL-Mart Network after Regional SummarizationRemote Office PVC FailurePrimary PVC FailureCase Study Analysis and Comparison with OSPFCase Study—EIGRP Behavior in DUAL-Mart Network after Two-Step SummarizationPrimary PVC FailureSummary
7. Route Filters
Case Study—Partial Connectivity over ISDN BackupEIGRP Route FiltersQuery Boundaries Established by EIGRP Route FiltersCase Study—DUAL-Mart ISDN Dial-Backup Network RedesignPrefix Lists—Improved Route FiltersCase Study—Network Meltdown after Frame Relay FailureSummary
8. Default Routes
IP Default Routing and IOS SpecificsClassful and Truly Classless Routing in IOSDefault Candidates and Gateways of Last ResortMonitoring Default CandidatesDefault Routes and Default Candidates in EIGRPEIGRP Default Routes—Design ExamplesEnterprise Network with a Single Connection to the InternetEnterprise Network with Multiple Connections to the InternetCase Study—GreatCoals NetworkSummary
9. Integrating EIGRP with Other Enterprise Routing Protocols
Case Study 1—Large Network with No Addressing StructureCase Study 2—Large Network with No LayeringCase Study 3—Network Migrating from Another Vendor to CiscoCase Study 4—Service Provider with a Large Number of RoutesRedistribution between Routing ProcessesVarious Redistribution Designs and Potential CaveatsOne-Point, One-Way RedistributionMultipoint One-Way RedistributionMultipoint Two-Way RedistributionRedistribute Only Internal RoutesRedistribute Routes Using Route TagsRedistribution Control with Route FiltersCase Study SolutionsCase Study 1 Solution—Integrating RIP with EIGRPCase Study 2 Solution—Multiple EIGRP ProcessesQuery Boundaries in Multiple EIGRP ProcessesCase Study 3 Solution—RIPv2 and EIGRP Integration with FiltersCase Study 4 Solution—BGP and EIGRP IntegrationSummary
10. Designing Scalable IPX EIGRP Networks
IPX Route FiltersIPX Default RoutesControlling Route Redistribution between IPX Routing ProtocolsCase Study—GreatCoalsCase Study—Reducing IPX EIGRP Diameter in GreatCoals NetworkCase Study—Combining IPX RIP and IPX EIGRP in an Access NetworkSummary
11. Designing Scalable AppleTalk EIGRP Networks
AppleTalk EIGRP Route FiltersOther AppleTalk EIGRP Scalability OptionsCase Study—Frisco Systems, Inc.Case Study SolutionSummary
III. Running EIGRP over Switched WAN and Dial-Up Networks
12. Switched WAN Networks and Their Impact on EIGRP
Case Study 1—A Large Number of EIGRP Neighbors over a Frame Relay LinkBroadcast Emulation on Switched WAN (Pseudobroadcasting)Layer 2 to Layer 3 Mapping in WAN EnvironmentTroubleshooting Neighbor Map ProblemsScenario 1—Missing Broadcast Keyword on a Neighbor MapScenario 2—Wrong IP Address in the Neighbor MapScenario 3—Wrong DLCI Number in the Neighbor MapSubinterfacesPoint-to-Point and Multipoint SubinterfacesCreating, Configuring, and Removing SubinterfacesUsing Subinterfaces to Reduce Interface Output Load Due to EIGRP Hello PacketsSummary
13. Running EIGRP over WAN Networks
Case Study—Improving Neighbor Loss DetectionOverhead Placed on the WAN Links by the EIGRP Hello PacketsCase Study—WAN Link Overload Due to EIGRP TrafficLoad Control on WAN Links—EIGRP PacingEIGRP Pacing DesignEIGRP Pacing Design ExamplesCase Study—Partial Connectivity over Frame RelayEIGRP Split HorizonRunning EIGRP over Various Switched WAN TechnologiesRunning EIGRP over X.25Running EIGRP over Frame RelayRunning EIGRP over ATMSummary
14. EIGRP and Dial-Up Networks
Case Study—A Simple Dial-Up NetworkEIGRP Bandwidth Issues in Dial-Up NetworksEIGRP Query Boundaries in a Dial-Up EnvironmentCase Study—Route Flaps in a Dial-Up EnvironmentCase Study—Dial-Out RequirementsEIGRP Use in Dial-Out RequirementsCase Study—EIGRP Use in a Dial-Backup ScenarioEIGRP Neighbor Loss Detection IssuesSummary
15. Secure EIGRP Operation
Case Study—Collecting Usernames and Passwords through a Fake ServerCase Study—Denial-of-Service Attack on a Core NetworkEIGRP MD5 AuthenticationConfiguring EIGRP MD5 AuthenticationShortcomings of EIGRP MD5 AuthenticationDesign Issues and GuidelinesParameter 1—Scope of an Individual KeyParameter 2—Key ChangesParameter 3—Key DistributionKey Rollover Design and Integration with NTPTroubleshooting EIGRP MD5 AuthenticationSummary

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Copyright

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All rights reserved. No part of this book may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, without written permission from the publisher, except for the inclusion of brief quotations in a review.

Printed in the United States of America 1 2 3 4 5 6 7 8 9 0

Library of Congress Cataloging-in-Publication Number: 99-61718

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