Chapter10
IGMPSnooping
Configuration
TableofContents
IGMPSnoopingOverview....................................................87
ConguringIGMPSnooping.................................................89
IGMPSnoopingCongurationExample.................................92
IGMPSnoopingMaintenanceandDiagnosis...........................93
IGMPSnoopingOverview
IGMPsnoopingisoneoflayer2functionsoftheswitch,whichcan
limittheforwardingofIPmulticasttrafc.
AsshowninFigure23,IGMPrunsbetweenhostandmulticast
router .IGMPcommunicationsbetweenhostandroutersothat
theswitchcanlearnwhichportsaremulticastmembersandget
multicastforwardtablebeforeforwardingmulticastpackets.Mul-
ticastpacketissenttotheportinthemulticastforwardtableonly.
IGMPsnoopingavoidunnecessarynetworkbandwidthwasteand
improvetheswitchutilization.
CondentialandProprietaryInformationofZTECORPORATION87