Interlogix NS3550-2T-8S User Manual - Manual (Page 170)

IFS NS3552-8P-2S AND NS3550-2T-8S User Manual
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4.8 Multicast
4.8.1 IGMP Snooping
The Internet Group Management Protocol (IGMP) lets host and routers share information about multicast groups
memberships. IGMP snooping is a switch feature that monitors the exchange of IGMP messages and copies them to the CPU for
feature processing. The overall purpose of IGMP Snooping is to limit the forwarding of multicast frames to only ports that are a
member of the multicast group.
About the Internet Group Management Protocol (IGMP) Snooping
Computers and network devices that want to receive multicast transmissions need to inform nearby routers that they will become
members of a multicast group. The Internet Group Management Protocol (IGMP) is used to communicate this information.
IGMP is also used to periodically check the multicast group for members that are no longer active. In the case where there is
more than one multicast router on a sub network, one router is elected as the ‘queried’. This router then keeps track of the
membership of the multicast groups that have active members. The information received from IGMP is then used to determine if
multicast packets should be forwarded to a given sub network or not. The router can check, using IGMP, to see if there is at least
one member of a multicast group on a given subnet work. If there are no members on a sub network, packets will not be
forwarded to that sub network.
Figure 4-8-1: Multicast Service