User’s Manual of GS-5220 LCD Series
252
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no longer active.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.
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