组播案例与分析

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1、组播案例与分析测试中心IP组播技术的出现及时解决了大量带宽资源的浪费。组播源仅发送一次信息，组播路市协议为组播数据包建立树型路由，被传递的信息在尽可能远的分叉路口才开始复制和分发，因此，信息能够被准确高效地传送到每个需要它的用户。一、网络拓扑交换机配置S3550：Systemsoftwareversion:2.41(2)BuiIdOct242005ReleaseBuildingconfiguration.・・Currentconfigumtion:512bytesversion1.0hostname3550vlcin1i■vlan10i■vlan20I■enablesecretlev

2、el15%Q+/7R:lu_;CY&-8L0〈DX'.tj9二Genablesecretlevel155%Qein，.t"fjo+/7YcgkE,luXdhl&-8Ui■interfaceFastEthornot0/1descriptioncormecttoserverswitchportaccessvlein10interfaceFastEthernet0/2switchportaccessvlein20interfaceVian10ipaddress192.168.10.1255.255.255.0ippim1interfaceVian20ipaddress192.168.20.

3、1255.255.255.0ippim■ipmulticast-routingendS2126G：Systemsoftwareversion:1.63(8)BuildJun242006TestBuildingconfiguration.・・Currentconfiguration:337bytesi■version1.0i■hostnameS2126Gvlan1i■enablesecretlevel15%Q,lu_;C"_-8U0Henablesecretlevel155%QH.Y*T7,IZ[V/YD+S(W&XG1X)sv*I■interfa

4、cevlan1noshutdownipaddress192.168.20.3255.255.255.0i■ipigmpsnoopingivglipigmpsnoopingvlan1mrouterinterfacefastEthernet0/1(注意：由于网络中存在组播路由器S3550,所以在S2126G需要配置路由连接口，以便转发IGMPreportsIGMPleave或IGMPquery报文)end三、IP组播报文转发过程1、组播源发送组播报文@(Uatitled)-EtherealFileEditViewGoCaptureAnalyzeStatisticsHelp①春盘⑥q钱脾怕

5、劭炭［idEilter:▼

6、Expression…

7、Qlear

8、^pplyINo..TimeSourceDestinationProtocol20.249995192.168.10.253224.1.1.4UDPInfoSouruEport:1212Destinationport:1212ArrivalTime:Jun27,200614:07:28.203238000Timedeltafrompreviouspacket:0.000000000secondsTimesincereferenceorfirstframe:0.000000000secondsFrameNumber:1Pa

9、cketLmngth:298bytesCaptureLength:298bytesProtocols"inframe:eth:ip:udp:data日EthernetII,Src:00:0f:ea:02:bc:la,Dst:01:00:5e:01:01:04Destination:01:00:5e:01:01:04(01:00:5e:01:01:04)Source:00:0f:ea:02:bc:la(Giga-Byt_02:bc:la)Type:IP(0x0800)SinternetProtocol,SrcAddr:192.168.10.253(192.168.10.253),Dst

10、Addr:224.1.1.4(224.1.1.4)version:4Headerlength:20bytes田Differerrt*iatEdservicesField:0x00(DSCP0x00:Default;ECN：0x00)TotalLength:284Identification:0xe21c(57884)田Flags:0x00Fragmentoffset:0Timetolive:8Protocol:UDP(0x11)Headerchecksum