CCNP Enterprise Advanced Routing ENARSI 300-410 Official Cert Guide (2023)

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CCNP Enterprise Advanced Routing ENARSI 300-410Official Cert GuideCompanion Website and Pearson Test Prep Access CodeAccess interactive study tools on this book’s companion website, including practice testsoftware, review exercises, video training, Key Term flash card application, a studyplanner, and more!To access the companion website, simply follow these steps:1.Go tociscopress.com/register.2.Enter theprint book ISBN:9780138217525.3.Answer the security question to validate your purchase.4.Go to your account page.5.Click on theRegistered Productstab.6.Under the book listing, click on theAccess Bonus Contentlink.When you register your book, your Pearson Test Prep practice test access code willautomatically be populated with the book listing under the Registered Products tab. Youwill need this code to access the practice test that comes with this book. You can redeemthe code atPearsonTestPrep.com. Simply choose Pearson IT Certification as yourproduct group and log into the site with the same credentials you used to register yourbook. Click theActivate New Productbutton and enter the access code. More detailedinstructions on how to redeem your access code for both the online and desktop versionscan be found on the companion website.If you have any issues accessing the companion website or obtaining your PearsonTest Prep practice test access code, you can contact our support team by going topearsonitp.echelp.org.

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Cisco PressCCNPEnterpriseAdvancedRoutingOfficialCert Guide,Second EditionRAYMOND LACOSTEBRAD EDGEWORTH, CCIE No. 31574ENARSI300-410

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ivCCNPEnterpriseAdvancedRoutingENARSI300-410OfficialCertGuideCCNP Enterprise Advanced RoutingENARSI 300-410 Official Cert Guide,Second EditionRaymond Lacoste, Brad EdgeworthCopyright© 2024 Cisco Systems, Inc.Published by:Cisco PressAll rights reserved. This publication is protected by copyright, and permission must be obtained from thepublisher prior to any prohibited reproduction, storage in a retrieval system, or transmission in any formor by any means, electronic, mechanical, photocopying, recording, or likewise. For information regardingpermissions, request forms, and the appropriate contacts within the Pearson Education Global Rights &Permissions Department, please visit www.pearson.com/permissions.No patent liability is assumed with respect to the use of the information contained herein. Althoughevery precaution has been taken in the preparation of this book, the publisher and author assume noresponsibility for errors or omissions. Nor is any liability assumed for damages resulting from the use ofthe information contained herein.$PrintCodeLibrary of Congress Control Number: 2023911481ISBN-13: 978-0-13-821752-5ISBN-10: 0-13-821752-1Warning and DisclaimerThis book is designed to provide information about Implementing Cisco Enterprise Advanced Routingand Services (ENARSI 300-410). Every effort has been made to make this book as complete and as accu-rate as possible, but no warranty or fitness is implied.The information is provided on an “as is” basis. The authors, Cisco Press, and Cisco Systems, Inc. shallhave neither liability nor responsibility to any person or entity with respect to any loss or damages arisingfrom the information contained in this book or from the use of the discs or programs that may accom-pany it.The opinions expressed in this book belong to the author and are not necessarily those ofCisco Systems, Inc.Trademark AcknowledgmentsAll terms mentioned in this book that are known to be trademarks or service marks have been appropri-ately capitalized. Cisco Press or Cisco Systems, Inc., cannot attest to the accuracy of this information.Use of a term in this book should not be regarded as affecting the validity of any trademark or servicemark.Figure credit: Figure 7-1 Wireshark

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vSpecial SalesFor information about buying this title in bulk quantities, or for special sales opportunities (which mayinclude electronic versions; custom cover designs; and content particular to your business, traininggoals, marketing focus, or branding interests), please contact our corporate sales department atcorpsales@pearsoned.com or (800) 382-3419.For government sales inquiries, please contact governmentsales@pearsoned.com.For questions about sales outside the U.S., please contact international@pearsoned.com.Feedback InformationAt Cisco Press, our goal is to create in-depth technical books of the highest quality and value. Each bookis crafted with care and precision, undergoing rigorous development that involves the unique expertise ofmembers from the professional technical community.Readers’ feedback is a natural continuation of this process. If you have any comments regarding how wecould improve the quality of this book, or otherwise alter it to better suit your needs, you can contact usthrough email at feedback@ciscopress.com. Please make sure to include the book title and ISBN in yourmessage.We greatly appreciate your assistance.Vice President, IT Professional:Mark TaubTechnical Editor:Hector Mendoza, JrAlliances Manager, Cisco Press:Jaci Featherly; James RislerEditorial Assistant:Cindy TeetersDirector, ITP Product Management:Brett BartowDesigner:Chuti PrasertsithManaging Editor:Sandra SchroederComposition:CodemantraDevelopment Editor:Ellie C. BruIndexer:Erika MillenSenior Project Editor:Mandie FrankProofreader:Barbara MackCopy Editor:Kitty WilsonAmericas HeadquartersCisco Systems, Inc.San Jose, CAAsia Pacific HeadquartersCisco Systems (USA) Pte. Ltd.SingaporeEurope HeadquartersCisco Systems International BV Amsterdam,The NetherlandsCisco has more than 200 offices worldwide. Addresses, phone numbers, and fax numbers are listed on the Cisco Website atwww.cisco.com/go/offices.Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, goto this URL: www.cisco.com/go/trademarks. Third party trademarks mentioned are the property of their respective owners. The use of the word partner does not implya partnership relationship between Cisco and any other company. (1110R)Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks,go to this URL: www.cisco.com/go/trademarks. Third party trademarks mentioned are the property of their respective owners. The use of the word partner doesnot imply a partnership relationship between Cisco and any other company. (1110R)Americas HeadquartersCisco Systems, Inc.San Jose, CAAsia Pacific HeadquartersCisco Systems (USA) Pte. Ltd.SingaporeEurope HeadquartersCisco Systems International BV Amsterdam,The NetherlandsCisco has more than 200 offices worldwide. Addresses, phone numbers, and fax numbers are listed on the Cisco Website atwww.cisco.com/go/offices.

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Pearson’s Commitment to Diversity, Equity,and InclusionPearson is dedicated to creating bias-free content that reflects the diversity of all learners.We embrace the many dimensions of diversity, including but not limited to race, ethnic-ity, gender, socioeconomic status, ability, age, sexual orientation, and religious or politicalbeliefs.Education is a powerful force for equity and change in our world. It has the potential todeliver opportunities that improve lives and enable economic mobility. As we work withauthors to create content for every product and service, we acknowledge our responsibil-ity to demonstrate inclusivity and incorporate diverse scholarship so that everyone canachieve their potential through learning. As the world’s leading learning company, we havea duty to help drive change and live up to our purpose to help more people create abetter life for themselves and to create a better world.Our ambition is to purposefully contribute to a world where■Everyone has an equitable and lifelong opportunity to succeed through learning■Our educational products and services are inclusive and represent the rich diversityof learners■Our educational content accurately reflects the histories and experiences of thelearners we serve■Our educational content prompts deeper discussions with learners and motivatesthem to expand their own learning (and worldview)While we work hard to present unbiased content, we want to hear from you about anyconcerns or needs with this Pearson product so that we can investigate and address them.Please contact us with concerns about any potential bias at https://www.pearson.com/report-bias.html.

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viiAbout the AuthorsRaymond Lacostehas dedicated his career to developing the skills of those interestedin IT. In 2001, he began to mentor hundreds of IT professionals pursuing their Ciscocertification dreams. This role led to teaching Cisco courses full time. Raymond iscurrently a master instructor for Cisco Enterprise Routing and Switching, AWS, ITIL,and CyberSecurity at StormWind Studios. Raymond treats all technologies as anescape room, working to uncover every mystery in the protocols he works with. Alongthis journey, Raymond has passed more than 120 exams, and his office wall includescertificates from Microsoft, Cisco, ISC2, ITIL, AWS, and CompTIA. If you werevisualizing Raymond’s office, you’d probably expect the usual network equipment,certifications, and awards. Those certainly take up space, but they aren’t his pride and joy.Most impressive, at least to Raymond, is his gemstone and mineral collection; once hestarts talking about it, he just can’t stop. Who doesn’t get excited by a wondrous baritespecimen in a pyrite matrix? Raymond presently resides with his wife and two childrenin eastern Canada, where they experience many adventures together.Brad Edgeworth, CCIE No. 31574 (R&S and SP), is an SD-WAN technical solutionsarchitect at Cisco Systems. Brad is a distinguished speaker at Cisco Live, where he haspresented on various topics. Before joining Cisco, Brad worked as a network architect andconsultant for various Fortune 500 companies. Brad’s expertise is based on enterprise andservice provider environments, with an emphasis on architectural and operationalsimplicity. Brad holds a bachelor of arts degree in computer systems management fromSt. Edward’s University in Austin, Texas. Brad can be found on Twitter as@BradEdgeworth.

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viiiCCNPEnterpriseAdvancedRoutingENARSI300-410OfficialCertGuideAbout the Technical ReviewerHector Mendoza, Jr., CCIE No. 10687 (R&S, SP, and Security), has spent the past14 years at Cisco Systems and is currently a solutions integration architect supportinglarge SP customers. Prior to this proactive role in CX, he spent nearly a decade providingreactive support in High Touch Technical Services in the Security Group, where heprovided escalation support for some of the largest customers for Cisco. A four-timeCisco Live speaker and an Alpha reviewer of Cisco Security courseware, Hector is a hugeadvocate of continuing education and knowledge sharing. Hector has a passion fortechnology, enjoys solving complex problems, and loves working with customers.In hisspare time, he tech reviews his esteemed colleagues’ Cisco Press books.

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ixDedicationsRaymond Lacoste:This book (just like the first edition) is dedicated to my wife, Melanie, who has dedicatedher life to making me a better person, which is the hardest job in the world. Thank you,Melanie, for being the most amazing wife and mother in the world.Brad Edgeworth:This book is dedicated to my daughter, Teagan. Hopefully you’ll want to learn what iswritten inside of this text. Until then, enjoy your youth.

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xCCNPEnterpriseAdvancedRoutingENARSI300-410OfficialCertGuideAcknowledgmentsRaymond Lacoste:As with the first edition of this book, a huge thank you goes out to Brad for joining meon this writing adventure. Putting our knowledge together to create this work of art wasthe best decision. Thank you so much for sharing this with me.Thank you to my wife and children, for allowing me to avoid many family adventureswhile this book was being developed and supporting me though the entire process. Loveyou guys!Finally, thank you to the entire team at Cisco Press, as well as their families and friends,who work extremely hard to produce high-quality training material.Brad Edgeworth:To Raymond and Brett, thanks for letting me write this book. I am privileged to be ableto share my knowledge with others, and I’m grateful. To the rest of the Cisco Press team,thanks for taking my block of stone and turning it into a work of art.To the technical editor: Hector, thank you for the time and expertise.Many people within Cisco have shared their knowledge with me and taken a chance onme with various projects over the years. For that I’m forever indebted.

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xiContents at a GlanceIntroductionxxxvChapter 1IPv4/IPv6 Addressing and RoutingReview2Chapter 2EIGRP72Chapter 3Advanced EIGRP106Chapter 4Troubleshooting EIGRP for IPv4138Chapter 5EIGRPv6188Chapter 6OSPF222Chapter 7Advanced OSPF260Chapter 8Troubleshooting OSPFv2314Chapter 9OSPFv3370Chapter 10Troubleshooting OSPFv3392Chapter 11BGP426Chapter 12Advanced BGP480Chapter 13BGP Path Selection524Chapter 14Troubleshooting BGP556Chapter 15Route Maps and Conditional Forwarding620Chapter 16Route Redistribution648Chapter 17Troubleshooting Redistribution674Chapter 18VRF, MPLS, and MPLS Layer 3 VPNs724Chapter 19DMVPN Tunnels766Chapter 20Securing DMVPN Tunnels820Chapter 21Troubleshooting ACLs and Prefix Lists842Chapter 22Infrastructure Security866Chapter 23Device Management and Management Tools Troubleshooting890Chapter 24Final Preparation944

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xiiCCNPEnterpriseAdvancedRoutingENARSI300-410OfficialCertGuideChapter 25ENARSI 300-410Exam Updates954Appendix AAnswers to the “Do I Know This Already?” Quiz Questions958Glossary972Index990Online ElementsAppendix BCommand Reference ExercisesAppendix CCommand Reference Exercises Answer KeyAppendix DStudy Planner

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xiiiContentsIntroductionxxxvChapter 1IPv4/IPv6 Addressing and RoutingReview2“Do I Know This Already?” Quiz3Foundation Topics7IPv4 Addressing7IPv4 Addressing Issues7Determining IP Addresses Within a Subnet10DHCP for IPv411Reviewing DHCP Operations11Potential DHCP Troubleshooting Issues16DHCP Troubleshooting Commands17IPv6 Addressing19IPv6 Addressing Review19EUI-6420IPv6 SLAAC, Stateful DHCPv6, and Stateless DHCPv622SLAAC22Stateful DHCPv627Stateless DHCPv628DHCPv6 Operation29DHCPv6 Relay Agents30Packet-Forwarding Process31Reviewing the Layer 3 Packet-Forwarding Process31Troubleshooting the Packet-Forwarding Process35Administrative Distance38Data Structures and the Routing Table39Sources of Routing Information39Static Routes41IPv4 Static Routes42IPv6 Static Routes46Trouble Tickets48IPv4 Addressing and Addressing Technologies Trouble Tickets48Trouble Ticket 1-148Trouble Ticket 1-250

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xivCCNPEnterpriseAdvancedRoutingENARSI300-410OfficialCertGuideIPv6 Addressing Trouble Tickets53Trouble Ticket 1-354Trouble Ticket 1-457Static Routing Trouble Tickets61Trouble Ticket 1-561Trouble Ticket 1-664Exam Preparation Tasks66Review All Key Topics66Define Key Terms68Use the Command Reference to Check Your Memory68Chapter 2EIGRP72“Do I Know This Already?” Quiz72Foundation Topics74EIGRP Fundamentals74Autonomous Systems75EIGRP Terminology75Topology Table76EIGRP Neighbors77Inter-RouterCommunication78Forming EIGRP Neighbors79EIGRP Configuration Modes80Classic Configuration Mode80EIGRP Named Mode80EIGRP Network Statement81Sample Topology and Configuration83Confirming Interfaces84Verifying EIGRP Neighbor Adjacencies85Displaying Installed EIGRP Routes86Router ID87Passive Interfaces88Authentication91KeychainConfiguration92EnablingAuthenticationontheInterface92Path Metric Calculation94Wide Metrics96Metric Backward Compatibility98

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Contents xvInterface Delay Settings99Custom K Values100Load Balancing100References in This Chapter 102Exam Preparation Tasks102Review All Key Topics103Define Key Terms103Use the Command Reference to Check Your Memory103Chapter 3Advanced EIGRP106“Do I Know This Already?” Quiz106Foundation Topics108Failure Detection and Timers108Convergence109Stuck in Active112Route Summarization114Interface-Specific Summarization114Summary Discard Routes116Summarization Metrics117Automatic Summarization118WAN Considerations119EIGRP Stub Router119Stub Site Functions121IP Bandwidth Percentage125Split Horizon126Route Manipulation129Route Filtering129Traffic Steering with EIGRP Offset Lists132References in This Chapter 135Exam Preparation Tasks135Review All Key Topics135Define Key Terms136Use the Command Reference to Check Your Memory136Chapter 4Troubleshooting EIGRP for IPv4138“Do I Know This Already?” Quiz138Foundation Topics141Troubleshooting EIGRP for IPv4 Neighbor Adjacencies141

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xviCCNPEnterpriseAdvancedRoutingENARSI300-410OfficialCertGuideInterface Is Down142Mismatched Autonomous System Numbers142Incorrect Network Statement144Mismatched K Values145Passive Interface146Different Subnets148Authentication148ACLs150Timers151Troubleshooting EIGRP for IPv4 Routes151Bad or Missing network Command152Better Source of Information154Route Filtering157Stub Configuration158Interface Is Shut Down160Split Horizon161Troubleshooting Miscellaneous EIGRP for IPv4 Issues162Feasible Successors162Discontiguous Networks and Autosummarization165Route Summarization167Load Balancing168EIGRP for IPv4 Trouble Tickets169Trouble Ticket 4-1169Trouble Ticket 4-2177Trouble Ticket 4-3180Exam Preparation Tasks184Review All Key Topics184Define Key Terms185Use the Command Reference to Check Your Memory185Chapter 5EIGRPv6188“Do I Know This Already?” Quiz188Foundation Topics191EIGRPv6 Fundamentals191EIGRPv6 Inter-Router Communication191EIGRPv6 Configuration191EIGRPv6ClassicModeConfiguration191

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ContentsxviiEIGRPv6NamedModeConfiguration192EIGRPv6Verification193IPv6 Route Summarization195Default Route Advertising196Route Filtering197Troubleshooting EIGRPv6 Neighbor Issues197Interface Is Down198Mismatched Autonomous System Numbers198Mismatched K Values198Passive Interfaces198Mismatched Authentication199Timers200Interface Not Participating in Routing Process200ACLs201Troubleshooting EIGRPv6 Routes201Interface Not Participating in the Routing Process201Better Source of Information201Route Filtering201Stub Configuration202Split Horizon203Troubleshooting Named EIGRP204EIGRPv6 and Named EIGRP Trouble Tickets209Trouble Ticket 5-1209Trouble Ticket 5-2213Exam Preparation Tasks218Review All Key Topics218Define Key Terms219Use the Command Reference to Check Your Memory219Chapter 6OSPF222“Do I Know This Already?” Quiz222Foundation Topics225OSPF Fundamentals225Areas226Inter-Router Communication228Router ID229OSPF Hello Packets229

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xviiiCCNPEnterpriseAdvancedRoutingENARSI300-410OfficialCertGuideNeighbors230Requirements for Neighbor Adjacency230OSPF Configuration232OSPF Network Statement232Interface-Specific Configuration233Passive Interfaces233Sample Topology and Configuration233Confirmation of Interfaces235Verification of OSPF Neighbor Adjacencies237Viewing OSPF Installed Routes238External OSPF Routes240Default Route Advertisement241The Designated Router and Backup Designated Router242Designated Router Elections244DR and BDR Placement245OSPF Network Types246Broadcast247Nonbroadcast247Point-to-Point Networks248Point-to-Multipoint Networks249Loopback Networks253Failure Detection254Hello Timer255Dead Interval Timer255Verifying OSPF Timers255Authentication255References in This Chapter 257Exam Preparation Tasks258Review All Key Topics258Define Key Terms258Use the Command Reference to Check Your Memory258Chapter 7Advanced OSPF260“Do I Know This Already?” Quiz260Foundation Topics262Link-State Advertisements262LSA Sequences264

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ContentsxixLSA Age and Flooding264LSA Types264LSAType1:RouterLink264LSAType2:NetworkLink269LSAType3:SummaryLink271LSAType5:ExternalRoutes277LSAType4:ASBRSummary279LSAType7:NSSAExternalSummary281LSATypeSummary283OSPF Stubby Areas284Stub Areas284Totally Stubby Areas287Not-So-Stubby Areas289Totally NSSAs292OSPF Path Selection294Link Costs295Intra-area Routes295Inter-area Routes296External Route Selection297E1 and N1 External Routes297E2 and N2 External Routes297Equal-Cost Multipathing298Summarization of Routes298Summarization Fundamentals299Inter-area Summarization301Configuration of Inter-area Summarization301External Summarization303Discontiguous Network305Virtual Links307References in This Chapter 310Exam Preparation Tasks310Review All Key Topics310Define Key Terms311Use the Command Reference to Check Your Memory311Chapter 8Troubleshooting OSPFv2314“Do I Know This Already?” Quiz314Foundation Topics317

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xxCCNPEnterpriseAdvancedRoutingENARSI300-410OfficialCertGuideTroubleshooting OSPFv2 Neighbor Adjacencies317Interface Is Down319Interface Not Running the OSPF Process319Mismatched Timers321Mismatched Area Numbers322Mismatched Area Type323Different Subnets324Passive Interface325Mismatched Authentication Information326ACLs327MTU Mismatch328Duplicate Router IDs330Mismatched Network Types330Troubleshooting OSPFv2 Routes332Interface Not Running the OSPF Process333Better Source of Information334Route Filtering337Stub Area Configuration339Interface Is Shut Down341Wrong Designated Router Elected341Duplicate Router IDs344Troubleshooting Miscellaneous OSPFv2 Issues346Tracking OSPF Advertisements Through a Network346Route Summarization348Discontiguous Areas350Load Balancing352Default Route353OSPFv2 Trouble Tickets353Trouble Ticket 8-1353Trouble Ticket 8-2361Trouble Ticket 8-3364Exam Preparation Tasks366Review All Key Topics366Define Key Terms367Use the Command Reference to Check Your Memory367

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ContentsxxiChapter 9OSPFv3370“Do I Know This Already?” Quiz370Foundation Topics371OSPFv3 Fundamentals371OSPFv3 Link-State Advertisement372OSPFv3 Communication373OSPFv3 Configuration374OSPFv3 Verification377The Passive Interface378IPv6 Route Summarization379Network Type380OSPFv3 Authentication381OSPFv3 Link-Local Forwarding383OSPFv3 LSA Flooding Scope384References in This Chapter390Exam Preparation Tasks390Review All Key Topics390Define Key Terms391Use the Command Reference to Check Your Memory391Chapter 10Troubleshooting OSPFv3392“Do I Know This Already?” Quiz392Foundation Topics394Troubleshooting OSPFv3 for IPv6394OSPFv3 Troubleshooting Commands395OSPFv3 Trouble Tickets401Trouble Ticket 10-1401Trouble Ticket 10-2404Troubleshooting OSPFv3 Address Families408OSPFv3 AF Trouble Ticket418Trouble Ticket 10-3419Exam Preparation Tasks423Review All Key Topics423Define Key Terms424Use the Command Reference to Check Your Memory424Chapter 11BGP426“Do I Know This Already?” Quiz426Foundation Topics428

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xxiiCCNPEnterpriseAdvancedRoutingENARSI300-410OfficialCertGuideBGP Fundamentals428Autonomous System Numbers (ASNs)428BGP Sessions429Path Attributes429Loop Prevention430Address Families430Inter-Router Communication430BGPMessages431BGPNeighborStates432Basic BGP Configuration435Verification of BGP Sessions437Route Advertisement440Receiving and Viewing Routes443Understanding BGP Session Types and Behaviors448iBGP448iBGPFullMeshRequirement450PeeringUsingLoopbackAddresses451eBGP453eBGP and iBGP Topologies454Next-Hop Manipulation456iBGP Scalability Enhancements457RouteReflectors457Confederations462Multiprotocol BGP for IPv6465IPv6 Configuration466IPv6 over IPv4471References in This Chapter 475Exam Preparation Tasks476Review All Key Topics476Define Key Terms477Use the Command Reference to Check Your Memory477Chapter 12Advanced BGP480“Do I Know This Already?” Quiz480Foundation Topics482Route Summarization482Aggregate Addresses482The Atomic Aggregate Attribute488

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ContentsxxiiiRoute Aggregation with AS_SET489IPv6 Summarization492BGP Route Filtering and Manipulation493Distribute List Filtering495Prefix List Filtering496AS_Path Filtering497RegularExpressions(Regex)497AS_PathACLs503Route Maps505Clearing BGP Connections507BGP Communities507Enabling BGP Community Support508Well-Known Communities508TheNo_AdvertiseBGPCommunity509TheNo_ExportBGPCommunity510TheLocalAS(No_Export_SubConfed)BGPCommunity511Conditionally Matching BGP Communities512Setting Private BGP Communities514Maximum Prefix516Configuration Scalability517IOS XE Peer Groups517IOS XE Peer Templates518References in This Chapter 519Exam Preparation Tasks520Review All Key Topics520Define Key Terms520Use the Command Reference to Check Your Memory521Chapter 13BGP Path Selection524“Do I Know This Already?” Quiz524Foundation Topics526Understanding BGP Path Selection526BGP Best Path527Weight528Local Preference532PhaseI:InitialBGPEdgeRouteProcessing535PhaseII:BGPEdgeEvaluationofMultiplePaths536PhaseIII:FinalBGPProcessingState538

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xxivCCNPEnterpriseAdvancedRoutingENARSI300-410OfficialCertGuideLocally Originated in the Network or Aggregate Advertisement538Accumulated Interior Gateway Protocol (AIGP)539Shortest AS_Path540Origin Type542Multi-Exit Discriminator545MissingMEDBehavior548AlwaysCompareMED549BGPDeterministicMED549eBGP over iBGP550Lowest IGP Metric551Prefer the Oldest EBGP Session551Router ID551Minimum Cluster List Length552Lowest Neighbor Address552BGP Multipath553Exam Preparation Tasks554Review All Key Topics554Define Key Terms554Use the Command Reference to Check Your Memory554Chapter 14Troubleshooting BGP556“Do I Know This Already?” Quiz557Foundation Topics559Troubleshooting BGP Neighbor Adjacencies559Interface Is Down561Layer 3 Connectivity Is Broken561Path to the Neighbor Is Through the Default Route562Neighbor Does Not Have a Route to the Local Router563Incorrect neighbor Statement564BGP Packets Sourced from the Wrong IP Address564ACLs566The TTL of the BGP Packet Expires568Mismatched Authentication570Misconfigured Peer Groups570Timers572Troubleshooting BGP Routes573

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Contents xxvMissing or Bad network mask Command575Next-Hop Router Not Reachable577BGP Split-Horizon Rule579Better Source of Information580Route Filtering582Troubleshooting BGP Path Selection588Understanding the Best-Path Decision-Making Process588Private Autonomous System Numbers591Using debug Commands592Troubleshooting BGP for IPv6593BGP Trouble Tickets598Trouble Ticket 14-1598Trouble Ticket 14-2604Trouble Ticket 14-3610MP-BGP Trouble Ticket614Trouble Ticket 14-4615Exam Preparation Tasks617Review All Key Topics617Define Key Terms618Use the Command Reference to Check Your Memory618Chapter 15Route Maps and Conditional Forwarding620“Do I Know This Already?” Quiz620Foundation Topics622Conditional Matching622Access Control Lists (ACLs)622StandardACLs622ExtendedACLs623PrefixMatching624PrefixLists626IPv6PrefixLists627Route Maps627Conditional Matching629Complex Matching630Optional Actions631Continue631Conditional Forwarding of Packets632

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xxviCCNPEnterpriseAdvancedRoutingENARSI300-410OfficialCertGuidePBR Configuration633Local PBR635Trouble Tickets637Trouble Ticket 15-1638Trouble Ticket 15-2641Trouble Ticket 15-3643Exam Preparation Tasks645Review All Key Topics646Define Key Terms646Use the Command Reference to Check Your Memory646Chapter 16Route Redistribution648“Do I Know This Already?” Quiz648Foundation Topics650Redistribution Overview650Redistribution Is Not Transitive651Sequential Protocol Redistribution653Routes Must Exist in the RIB653Seed Metrics655Protocol-Specific Configuration656Source-Specific Behaviors657ConnectedNetworks657BGP657Destination-Specific Behaviors658EIGRP658EIGRP-to-EIGRPRedistribution661OSPF663OSPF-to-OSPFRedistribution666OSPFForwardingAddress667BGP670Reference in This Chapter672Exam Preparation Tasks672Review All Key Topics672Define Key Terms673Use the Command Reference to Check Your Memory673

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ContentsxxviiChapter 17Troubleshooting Redistribution674“Do I Know This Already?” Quiz674Foundation Topics677Troubleshooting Advanced Redistribution Issues677Troubleshooting Suboptimal Routing Caused by Redistribution678Troubleshooting Routing Loops Caused by Redistribution679Troubleshooting IPv4 and IPv6 Redistribution687Route Redistribution Review687Troubleshooting Redistribution into EIGRP689Troubleshooting Redistribution into OSPF694Troubleshooting Redistribution into BGP699Troubleshooting Redistribution with Route Maps702Redistribution Trouble Tickets702Trouble Ticket 17-1703Trouble Ticket 17-2708Trouble Ticket 17-3711Trouble Ticket 17-4717Exam Preparation Tasks721Review All Key Topics722Define Key Terms722Command Reference to Check Your Memory723Chapter 18VRF, MPLS, and MPLS Layer 3 VPNs724“Do I Know This Already?” Quiz724Foundation Topics727Implementing and Verifying VRF-Lite727VRF-Lite Overview728Creating and Verifying VRF Instances728An Introduction to MPLS Operations747MPLS LIB and LFIB748Label Switching Routers748Forwarding Equivalence Class (FEC)749Label-Switched Path749Labels750Label Distribution Protocol751Label Switching752

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xxviiiCCNPEnterpriseAdvancedRoutingENARSI300-410OfficialCertGuidePenultimate-Hop Popping753MPLS LDP Features754MPLS Traffic Engineering755An Introduction to MPLS Layer 3 VPNs755MPLS Layer 3 VPNs756MPLS Layer 3 VPNv4 Addresses, RDs, and RTs757MPLS Layer 3 VPN Label Stack759Reference in This Chapter762Exam Preparation Tasks762Review All Key Topics762Define Key Terms763Use the Command Reference to Check Your Memory763Chapter 19DMVPN Tunnels766“Do I Know This Already?” Quiz766Foundation Topics769Generic Routing Encapsulation (GRE) Tunnels769GRE Tunnel Configuration769GRE Sample Configuration771Next Hop Resolution Protocol (NHRP)774Dynamic Multipoint VPN (DMVPN)776Phase 1: Spoke-to-Hub777Phase 2: Spoke-to-Spoke777Phase 3: Hierarchical Tree Spoke-to-Spoke777DMVPN Phase Comparison777DMVPN Configuration779DMVPN Hub Configuration780DMVPN Spoke Configuration for DMVPN Phase 1 (Point-to-Point)782Viewing DMVPN Tunnel Status784Viewing the NHRP Cache787DMVPN Configuration for Phase 3 DMVPN (Multipoint)792IP NHRP Authentication794Unique IP NHRP Registration794Spoke-to-Spoke Communication795Forming Spoke-to-Spoke Tunnels796NHRP Routing Table Manipulation800NHRP Routing Table Manipulation with Summarization802

CCNP Enterprise Advanced Routing ENARSI 300-410 Official Cert Guide (2023) - Page 31 preview image

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ContentsxxixProblems with Overlay Networks806Recursive Routing Problems806Outbound Interface Selection808Front Door Virtual Routing and Forwarding (FVRF)808ConfiguringFrontDoorVRF(FVRF)809FVRFStaticRoutes810DMVPN Failure Detection and High Availability810DMVPN Hub Redundancy811IPv6 DMVPN Configuration811IPv6-over-IPv6 Sample Configuration813IPv6 DMVPN Verification816References in This Chapter 817Exam Preparation Tasks817Review All Key Topics817Define Key Terms818Use the Command Reference to Check Your Memory818Chapter 20Securing DMVPN Tunnels820“Do I Know This Already?” Quiz820Foundation Topics821Elements of Secure Transport821IPsec Fundamentals823Security Protocols824AuthenticationHeader824EncapsulatingSecurityPayload(ESP)824Key Management825Security Associations825ESP Modes825DMVPNWithoutIPsec826DMVPNwithIPsecinTransportMode826DMVPNwithIPsecinTunnelMode827IPsec Tunnel Protection827Pre-Shared Key Authentication827IKEv2Keyring828IKEv2Profile829IPsecTransformSet831IPsecProfile832EncryptingtheTunnelInterface833

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