User’s Manual of LRP-822CS/LRP-1622CS
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4.7.2 IGMP Snooping
The
Interne
tocol (IGMP)
lets host and routers share information about multicast groups
emberships. 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 IGMP is also used to periodically check the multicast group for members that are no longer active.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 multic
‘queried’. This router then keeps
ack of the membership of the multicast groups that have active members. The information received from IGMP is then used to
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 no
arded to that sub network.
t Group Management Pro
m
ast router on a sub network, one router is elected as the
tr
determine if multicast packets should be
t be forw
Figure 4-7-3
Multicast Service