Enterasys G3G170-24 - About Multicasting; Configuring IGMP at Layer 2; Purpose; Show Igmpsnooping

Configuring IGMP at Layer 2
10-2 IGMP Configuration
About Multicasting
Multicastingisusedtosupportreal‐timeapplicationssuchasvideoconferencesorstreaming
audio.Amulticastserverdoesnothavetoestablishaseparateconnectionwitheachclient.It
merelybroadcastsitsservicetothenetwork,andanyhoststhatwanttoreceivethemulticast
registerwiththeirlocalmulticast
switch/router.Althoughthisapproachreducesthenetwork
overheadrequiredbyamulticastserver,thebroadcasttrafficmustbecarefullyprunedatevery
multicastswitch/routeritpassesthroughtoensurethattrafficisonlypassedtothehoststhat
subscribedtothisservice.
TheG‐SeriesswitchdeviceusesIGMP(InternetGroup
ManagementProtocol)toqueryforany
attachedhostswhowanttoreceiveaspecificmulticastservice.ThedevicelooksuptheIP
MulticastGroupusedforthisserviceandaddsittotheegresslistoftheLevel3interface.Itthen
propagatestheservicerequestontoanyneighboring
multicastswitch/routertoensurethatitwill
continuetoreceivethemulticastservice.
Configuring IGMP at Layer 2
Purpose
ToconfigureIGMPsnoopingfromtheswitchCLI.
Commands
show igmpsnooping
UsethiscommandtodisplayIGMPsnoopinginformation.
Syntax
show igmpsnooping
Parameters
None.
For information about... Refer to page...
show igmpsnooping 10-2
set igmpsnooping adminmode 10-3
set igmpsnooping interfacemode 10-4
set igmpsnooping groupmembershipinterval 10-4
set igmpsnooping maxresponse 10-5
set igmpsnooping mcrtrexpiretime 10-6
set igmpsnooping add-static 10-6
set igmpsnooping remove-static 10-7
show igmpsnooping static 10-7
show igmpsnooping mfdb 10-8
clear igmpsnooping 10-9