Interlogix NS3500-28T-4S User Manual - Manual (Page 169)

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Figure 4-7-6 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.
4.7.2.1 IGMP Setting
This page provides IGMP Snooping related configuration.
Most of the settings are global, whereas the Router Port configuration is related to the current unit, as reflected by the
page header. The IGMP Snooping Setting and Information screens in Figure 4-7-7 , Figure 4-7-8 & Figure 4-7-9
appear.