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BGP-41989 : BGP-1 [RFC 1105]Replacement for EGP (1984, RFC904)1990 : BGP-2 [RFC 1163]1991 : BGP-3 [RFC 1267]1995 : BGP-4 [RFC 1771]Support for ClasslessInterdomain Routing (CIDR)
BGP Operations (Simplified)Establish session onTCP port 179AS1Exchange allactive routesExchange incrementalupdatesBGP sessionAS2While connectionis ALIVE exchangeroute UPDATE messages
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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
Page 45 and 46: Comparison of LS and DValgorithmsMe
Page 47 and 48: Internet- intra-domain: RIP, OSPF-
Page 49 and 50: Requirements for Intra-ASRoutingSho
Page 51 and 52: Requirements for Inter-ASRoutingSho
Page 53 and 54: Internet AS HierarchyIntra-AS borde
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: BGP-4 BGP = Border Gateway Protocol
Page 99 and 100: BGP AttributesValue Code Reference-
Page 101 and 102: Route Selection SummaryHighest Loca
Page 103 and 104: AS PATH Attribute135.207.0.0/16AS P
Page 105 and 106: Two Types of BGP NeighborRelationsh
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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