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Multicasting allows a host to send data packets across
the Internet to a set of hosts that can be on different,
geographically dispersed subnets. The source host sends
data to a pseudo destination called a multicast group,
and does so efficiently, using less bandwidth than unicast
or broadcast traffic. Unlike unicast transmission, which
would copy a packet to send it to multiple destinations,
multicast sources send a packet only once.
Multicast-aware routers on the Internet use multicast
routing protocols like PIM to deliver packets across
the Internet to subnets that have hosts in the multicast
group. These routers build and maintain distribution
trees to forward multicast traffic.
Current applications of multicasting include email
distribution lists, routing information flooding, and
web-based training seminars and voice/video conferences.
This application note describes how to send a S,G Join
message to a System Under Test (SUT) to see how fast
it can create a source-specific distribution tree and
start forwarding multicast traffic from the source to
a multicast group member.
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Network Services 
