Interlogix NS3550-2T-8S User Manual - Manual (Page 173)

IFS NS3552-8P-2S AND NS3550-2T-8S User Manual
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Figure 4-8-4: IGMP State Transitions
 IGMP Querier –
A router, or multicast-enabled switch, can periodically ask their hosts if they want to receive multicast traffic. If there is more
than one router/switch on the LAN performing IP multicasting, one of these devices is elected “querier” and assumes the
role of querying the LAN for group members. It then propagates the service requests on to any upstream multicast
switch/router to ensure that it will continue to receive the multicast service.
Multicast routers use this information, along with a multicast routing protocol such as DVMRP
or PIM, to support IP multicasting across the Internet.