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BGP Next Hop Attribute12.125.133.90AS 6431AT&T ResearchAS 7018AT&T12.127.0.121AS 12654RIPE NCCRIS project135.207.0.0/16Next Hop = 12.125.133.90135.207.0.0/16Next Hop = 12.127.0.121Every time a route announcement crosses an ASboundary, the Next Hop attribute is changed to the IPaddress of the border router that announced the route
Two Types of BGP NeighborRelationshipsAS1eBGP External Neighbor (eBGP) in adifferent AutonomousSystems Internal Neighbor (iBGP) inthe same Autonomous SystemiBGP is routed (using IGP!)iBGPAS2
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OUTLINEInternet- intra-domain: RIP,
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Shared BackplaneCPURouteTableBuffer
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Switched BackplaneLineCardCPUCardLi
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1. MooreMoore 2. Moore
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DRAM10001980 1983 1986 1989 1992 19
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OUTLINEInternet- intra-domain: RIP,
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Routing and ForwardingDefault toups
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Virtual circuits“source-to-dest p
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Datagram networks:the Internet mode
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Internet- intra-domain: RIP, OSPF-
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Before We Go AnyFurther …Usually,
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Routing AlgorithmClassificationGlob
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A Link-State RoutingAlgorithmDijkst
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Dijsktra’s Algorithm1 Initializat
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Spanning tree gives routing tableSt
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Distance Vector Routing Algorithmit
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Distance table gives routingtableED
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Distance Vector Algorithm:At all no
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Distance Vector Algorithm:exampleX2
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Distance Vector: link costchangesLi
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Comparison of LS and DValgorithmsMe
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Internet- intra-domain: RIP, OSPF-
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Requirements for Intra-ASRoutingSho
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Requirements for Inter-ASRoutingSho
Page 53 and 54: Internet AS HierarchyIntra-AS borde
Page 55 and 56: Internet- intra-domain: RIP, OSPF-
Page 57 and 58: RIP: Examplezw x yADBDestination Ne
Page 59 and 60: RIP: Link Failure andRecoveryIf no
Page 63 and 64: Hierarchical OSPFBackboneArea1 Area
Page 65 and 66: OSPFUse IP as transport, IP protoco
Page 67 and 68: OSPF Motivation (Cont.)Suffered fro
Page 69 and 70: Functional Requirements ofOSPF (Con
Page 71 and 72: OSPF BasicsDistributed, replicated
Page 73 and 74: OSPF Basics (Cont.)OSPF has 3 sub-p
Page 75 and 76: Neighbor Discovery andMaintenanceOS
Page 77 and 78: Choosing RoutesDijkstra - Shortest
Page 81 and 82: Intra-AS and Inter-AS routingaHosth
Page 83 and 84: Autonomous Routing DomainA collecti
Page 85 and 86: AS Numbers (ASNs)ASNs are 16 bit va
Page 87 and 88: Nontransit vs. Transit ASesISP 1ISP
Page 89 and 90: Customers and Providersproviderprov
Page 91 and 92: The Peering Relationshippeerprovide
Page 93 and 94: ISP6- “”- “”- “”CERNET
Page 95 and 96: BGP-4 BGP = Border Gateway Protocol
Page 97 and 98: BGP Operations (Simplified)Establis
Page 99 and 100: BGP AttributesValue Code Reference-
Page 101 and 102: Route Selection SummaryHighest Loca
Page 103: AS PATH Attribute135.207.0.0/16AS P
Page 107 and 108: Join EGP with IGP ForConnectivity13
Page 109 and 110: Attention• BGP is not guaranteed
Page 111 and 112: BGP SummaryBGP is a fairly simple p
Page 113: END
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