《ip组播介绍》ppt课件

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1、1©2000,CiscoSystems,Inc.22141197_05_2000_c2IntroductiontoIPMulticastSession2214OtherRelatedPresentationsMulticastSessionsSession#Title2214IntroductiontoIPMulticast2215PIMMulticastRouting2216DeployingIPMulticast2217AdvancedIPMulticastRoutingMBGPRelatedSe

2、ssionsSession#Title2209DeployingBGPAgendaWhyMulticast?MulticastAddressingHost-RouterSignaling:IGMPMulticastDistributionTreesMulticastForwardingMulticastRoutingProtocolsGeekometerServerRouterUnicastServerRouterMulticastUnicastvs.MulticastExample:AudioStre

3、amingAllclientslisteningtothesame8KbpsaudioEnhancedEfficiency:ControlsnetworktrafficandreducesserverandCPUloadsOptimizedPerformance:EliminatestrafficredundancyDistributedApplications:Makesmultipointapplicationspossible00.20.40.60.8TrafficMbps120406080100

4、#ClientsMulticastUnicastMulticastAdvantagesMulticastDisadvantagesBestEffortDelivery:Dropsaretobeexpected.Multicastapplicationsshouldnotexpectreliabledeliveryofdataandshouldbedesignedaccordingly.ReliableMulticastisstillanareaformuchresearch.Expecttoseemor

5、edevelopmentsinthisarea.NoCongestionAvoidance:LackofTCPwindowingand“slow-start”mechanismscanresultinnetworkcongestion.Ifpossible,Multicastapplicationsshouldattempttodetectandavoidcongestionconditions.Duplicates:Somemulticastprotocolmechanisms(e.g.Asserts

6、,RegistersandSPTTransitions)resultintheoccasionalgenerationofduplicatepackets.Multicastapplicationsshouldbedesignedtoexpectoccasionalduplicatepackets.OutofOrderDelivery:Someprotocolmechanismsmayalsoresultinoutoforderdeliveryofpackets.MulticastIsUDPBased!

7、!!AppsthatBenefitfromIPMulticastMultimediaStreamingmediaTraining,corporatecommunicationsConferencing—video/audioDatawarehousingFinancialapplicationsAnyone-to-manydatapushapplicationsAgendaWhyMulticast?MulticastAddressingHost-RouterSignaling:IGMPMulticast

8、DistributionTreesMulticastForwardingMulticastRoutingProtocolsIPMulticastGroupAddresses224.0.0.0–239.255.255.255Class“D”AddressSpaceHighorderbitsof1stOctet=“1110”ReservedLink-localAddresses224.0.0.0–224.0.0.255Transmittedwi