Operation Manual – MulticastH3C S7500 Series Ethernet Switches Chapter 3 IGMP Snooping Configuration3-2Multicast packet transmissionwithout IGMP SnoopingSourceMulticast routerHost AReceiverHost BHost CReceiverMulticast packetsLayer 2 switchMulticast packwhen IGMPSourceet transmissionSnooping runsMulticast routerHost AReceiverHost BHost CReceiverLayer 2 switchFigure 3-1 Multicast packet transmission with or without IGMP Snooping beingenabled3.1.2 IGMP Snooping ImplementationI. IGMPs:z witch port connected to a multicast group member (az lticast group identified by a MAC multicast address andely associated with IGMP snooping.Table 3-2 IGMP Snooping timersSnooping terminologiesBefore going on, we first describe the following IGMP Snooping related termz Router port: the switch port directly connected to the multicast router.Multicast member port: a shost in a multicast group).MAC multicast group: a mumaintained by the switch.The following three timers are closPacket normally Timeout actionTimer Setting rece reived befotimeout on the switchRouter port agingtimerof therouter portprobe messageterport any more.Aging timeIGMP generalquerymessage/PIMmessage/DVMRPConsider that thisport is not a rouMulticast groupmember port agingtimer member portsIGMP message e tomember port.Aging time of themulticast groupSend an IGMPgroup-specificquery messagthe multicast
