IP multicast offers a more efficient use of network resources, as compared to unicast and multicast technologies, for certain applications (for example, streaming video out to multiple receivers in a network). This chapter reviews the fundamentals of IP multicast technology, provides design guidance, and discusses security considerations.
Consider a video stream that needs to be sent to multiple recipients in a company. One approach is to unicast the traffic. The source server sends a copy of every packet to every receiver, as illustrated in Figure 10-1. Obviously, this approach has serious scalability limitations.
Figure 10-1 Unicast
An alternative approach is to broadcast ...