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BGP Routing Tablesshow ip bgpBGP table version is 111849680, local router ID is 203.62.248.4Status codes: s suppressed, d damped, h history, * valid, > best, i - internalOrigin codes: i - IGP, e - EGP, ? - incompleteNetwork Next Hop LocPrfPath. . .*>i192.35.25.0 134.159.0.1 50 16779 1 701 703 i*>i192.35.29.0 166.49.251.25 50 5727 7018 14541 i*>i192.35.35.0 134.159.0.1 50 16779 1 701 1744 i*>i192.35.37.0 134.159.0.1 50 16779 1 3561 i*>i192.35.39.0 134.159.0.3 50 16779 1 701 80 i*>i192.35.44.0 166.49.251.25 50 5727 7018 1785 i*>i192.35.48.0 203.62.248.34 55 16779 209 7843 225 225 225 225 225 i*>i192.35.49.0 203.62.248.34 55 16779 209 7843 225 225 225 225 225 i*>i192.35.50.0 203.62.248.34 55 16779 3549 714 714 714 i*>i192.35.51.0/25 203.62.248.34 55 16779 3549 14744 14744 14744 14744 1474414744 14744 14744 i. . . Thanks to Geoff Huston. http://www.telstra.net/ops on July 6, 2001
BGP SummaryBGP is a fairly simple protocol …… but it is not easy to configureBGP is running on more than 100Krouters, making it one of world’slargest and most visibledistributed systemsGlobal dynamics and scalingprinciples are still not wellunderstood
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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
Page 19 and 20:
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
Page 33 and 34:
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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Requirements for Intra-ASRoutingSho
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Requirements for Inter-ASRoutingSho
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Internet AS HierarchyIntra-AS borde
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RIP: Examplezw x yADBDestination Ne
Page 59 and 60: RIP: Link Failure andRecoveryIf no
Page 61 and 62: Internet- intra-domain: RIP, OSPF-
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 79 and 80: Internet- intra-domain: RIP, OSPF-
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 and 106: Two Types of BGP NeighborRelationsh
Page 107 and 108: Join EGP with IGP ForConnectivity13
Page 109: Attention• BGP is not guaranteed
Page 113: END
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