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1、 BGPAS- Autonomous SystemBGP- Border Gateway ProtocolDefined in RFC 1771CIDR- Classless Interdomain RoutingEGP- Exterior Gateway ProtocolDefined in RFC 904IGP- Internal Gateway ProtocolASEGP- External Gateway ProtocolASIGPBGPOSPFRIPBGPEGP(Edge Gateway Protocol)OSPFRIPIGP(Interior Gateway Protocol)BG
2、PEGPEGPNFSNETEGPBGP(AS)INTERNETBGPCIDR(Classless Interdomain Routing)BGPBGP(Socket)IBGP(Internal BGP)BGPEBGP(External BGP)BGPIBGPEBGPBGP1BGPBGPOSPFRIPTELNETSNMPSOCKETTCPUDPIPIPXPPPX.25BGPSocket1792BGPBGP4OPENUPDATEKEEPALIVENOTIFYOPEN Version (1) BGPMy Autonomous System (2) ASHold Time (2) BGP Identi
3、fier (4) OptParmLen (1) Optional Parameters () KEEPALIVEKEEPALIVENOTIFY0 1 2 3 40 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7ErrorcodeErrsubcodeDataErrorcode (1) 12OPEN3UPDATE456Errsubcode (1) Data () UPDATEUnfeasible Routes Len (2) Withdrawn Routes () Path Attribute Len (2) Path A
4、ttributes () ()Network Layer Reachability Information () () lengthprefix143BGPUPDATEBGPBGPBGP(1)ORIGINIGPBGPnetworkASIGPEGPBGPEGPEGPINCOMPLETEBGPIGPINCOMPLETEOSPFASEBGPIGPEGPINCOMPLETEIGPEGPINCOMPLETE(2)ASASASBGPASASEGPASBGPASBGPASASBGPEBGPASASASASASASAS3AS2ASASAS_SEQUENCEASASASASASAS_SEQUENCEAS_SETASAS(3)NEXTHOPEBGPBGPRTCRTAEBGP170.10.0.0170.10.20.2RTARTC150.10.0.0170.10.20.1IBGPBGPEBGPIBGPUPDATERTAIBGPRTB
