10G Core Routing Switch User Manual
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Advantages of Multicast
I. Multicast
IP multicast technology solves those problems. It allows the multicast source to send the information once only, and
ensures that the information will not be duplicated or distributed unless it reaches a fork in the tree route established
by the multicast routing protocol. See Figure 13-3 Data transmission in multicast mode.
Figure
Data transmission in multicast mode
Suppose the Users B, D, and E need the information, they need to be organized into a receiver group to ensure that the
information can reach them smoothly. The routers on the network duplicate and forward the information according to
the distribution of these users in the group.
In multicast mode, the information sender is called the "multicast source", the receiver is called the "multicast group",
and the routers for multicast information transmission are called "multicast routers". Members of a multicast group
can scatter around the network; the multicast group therefore has no geographical limitation. It should be noted that a
multicast source does not necessarily belong to a multicast group. It sends data to multicast groups but is not
necessarily a receiver. Multiple sources can send packets to a multicast group simultaneously.
II. Advantages
The main advantages of multicast are:
Enhanced efficiency: It reduces network traffic and relieves server and CPU of loads.
Optimized performance: It eliminates traffic redundancy.
Distributed application: It enables multipoint application.
Application of Multicast
IP multicast technology effectively implements point to multi-point forwarding with high speed, as saves network
bandwidth a lot and can relieve network loads. It facilitates also the development of new value-added services in the
Internet information service area that include online live show, Web TV, tele-education, telemedicine, network radio
station and real-time audio/video conferencing. It takes a positive role in:
