Interlogix NS3502-8P-2S User Manual - Manual (Page 163)

IFS NS3502-8P-2S User Manual
163
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multicast group for members that are no longer active.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.