IGMP Configuration Summary show igmp enable
9-2 IGMP Configuration
However,notethatIGMPneitheraltersnorroutesanyIPmulticastpackets.SinceIGMPisnot
concernedwiththedeliveryofIPmulticastpacketsacrosssubnetworks,anexternalIPmulticast
switchdeviceisneededifIPmulticastpacketshavetoberoutedacrossdifferentsubnetworks.
IGMP Configuration Summary
Multicastingisusedtosupportreal‐timeapplicationssuchasvideoconferencesorstreaming
audio.Amulticastserverdoesnothavetoestablishaseparateconnectionwitheachclient.It
merelybroadcastsitsservicetothenetwork,andanyhoststhatwanttoreceivethemulticast
registerwiththeirlocalmulticast
switch/router.Althoughthisapproachreducesthenetwork
overheadrequiredbyamulticastserver,thebroadcasttrafficmustbecarefullyprunedatevery
multicastswitch/routeritpassesthroughtoensurethattrafficisonlypassedtothehoststhat
subscribedtothisservice.
TheEnterasysMatrixSeriesswitchdeviceusesIGMP(Internet
GroupManagementProtocol)to
queryforanyattachedhostswhowanttoreceiveaspecificmulticastservice.Thedevicelooksup
theIPMulticastGroupusedforthisserviceandaddsanyportthatreceivedasimilarrequestto
thatgroup.Itthenpropagatestheservi cerequestontoany
neighboringmulticastswitch/routerto
ensurethatitwillcontinuetoreceivethemulticastservice.
Enabling / Disabling IGMP
Purpose
TodisplayIGMPinformationandtoenableordisableIGMPsnoopingonthedevice.
Commands
show igmp enable
UsethiscommandtodisplaythestatusofIGMPononeormoreVLAN(s).
Syntax
show igmp enable vlan-list
Parameters
Defaults
None.
For information about... Refer to page...
show igmp enable 9-2
set igmp enable 9-3
set igmp disable 9-3
vlan‐list SpecifiestheVLAN(s)forwhichtodisplayIGMPstatus.
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