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Figure 2 Broadcast Transmission —In IP multicast, applications send one copy of a packet and address it to a group of receivers (at the multicast address) that want to receive it rather than to a single receiver (for example, at a unicast address).
Multicast depends on the network to forward the packets to only those networks and hosts that need to receive them, therefore controlling network traffic and reducing the amount of processing that hosts have to do.
The extra bandwidth required may be in excess of some of your communication links.
This means unicast does not easily scale to large numbers of recipients.
It is not recommended to try to connect these islands with any kind of a tunnel.
There is little or no cost in configuring IP multicast on a router if there is no application traffic to forward.
—In unicast, applications can send one copy of each packet to each member of the multicast group.
Figure 1 Unicast Transmission —Broadcast applications can send one copy of each packet and address it to a broadcast address.Design Implementation Guide Introduction Planning Traffic Characteristics Features of IP Multicast Benefits of IP Multicast Phasing Costs Time to Deploy IP Multicast Fundamentals Deploying IP Multicast IP Multicast Group Addressing Internet Group Management Protocol Distribution Trees IP Multicast Routing Protocols Interdomain Multicast Routing Reliable Multicast-—Pragmatic General Multicast Appendix A: References IETF Documents Cisco sites More Information Appendix B: Acronyms—Multicast Made Easy is a comprehensive workbook and step-by-step planning guide for deploying IP multicast.This guide will ease your deployment of IP multicast and assist you with purchasing decisions.Multicast applications are not limited by domain boundaries but can be used throughout the entire Internet.
Figure 3 Basic Multicast Service •One to many, as when a single host sends to two or more receivers.•Many-to-many, also called N-way multicast, consists of any number of hosts sending to the same multicast group address, as well as receiving from it.