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iBGP Peers Must be FullyMeshedeBGP updateiBGP updatesA consistent view ofthe routes exteriorto the AS can beprovided by havingall BGP speakerswithin the ASmaintain direct BGPconnections witheach other
Join EGP with IGP ForConnectivity135.207.0.0/16Next Hop = 192.0.2.1135.207.0.0/1610.10.10.10Forwarding Tabledestination next hop192.0.2.0/30 10.10.10.10destination+EGPnext hop135.207.0.0/16 192.0.2.1AS 1 AS 2192.0.2.1192.0.2.0/30Forwarding Tabledestination next hop135.207.0.0/16 10.10.10.10192.0.2.0/30 10.10.10.10
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OUTLINEInternet- intra-domain: RIP,
Page 5 and 6:
Shared BackplaneCPURouteTableBuffer
Page 7 and 8:
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
Page 19 and 20:
Virtual circuits“source-to-dest p
Page 21 and 22:
Datagram networks:the Internet mode
Page 23 and 24:
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
Page 33 and 34:
Spanning tree gives routing tableSt
Page 35 and 36:
Distance Vector Routing Algorithmit
Page 37 and 38:
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 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 and 104: AS PATH Attribute135.207.0.0/16AS P
Page 105: Two Types of BGP NeighborRelationsh
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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