Enterasys SecureStack C2 C2G170-24

Configuring IGMP at Layer 2
13-2 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SecureStackC2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
For information about... Refer to page...
show igmpsnooping 13-2
set igmpsnooping adminmode 13-3
set igmpsnooping interfacemode 13-4
set igmpsnooping groupmembershipinterval 13-4
set igmpsnooping maxresponse 13-5
set igmpsnooping mcrtrexpiretime 13-6
set igmpsnooping add-static 13-6
set igmpsnooping remove-static 13-7
show igmpsnooping static 13-8
show igmpsnooping mfdb 13-8
clear igmpsnooping 13-9