Chapter 1 Multicast Overview; Introduction To Multicast; Comparison Of Information Transmission Techniques - H3C S5500-EI Series Operation Manual

Operation Manual – Multicast
H3C S5500-EI Series Ethernet Switches

Chapter 1 Multicast Overview

Note:
This manual chiefly focuses on the IP multicast technology and device operations.
Unless otherwise stated, the term "multicast" in this document refers to IP multicast.

1.1 Introduction to Multicast

As a technique coexisting with unicast and broadcast, the multicast technique
effectively addresses the issue of point-to-multipoint data transmission. By allowing
high-efficiency point-to-multipoint data transmission over a network, multicast greatly
saves network bandwidth and reduces network load.
With the multicast technology, a network operator can easily provide new value-added
services, such as live Webcasting, Web TV, distance learning, telemedicine, Web radio,
real-time videoconferencing, and other bandwidth- and time-critical information
services.

1.1.1 Comparison of Information Transmission Techniques

I. Unicast
In unicast, the information source sends a separate copy of information to each host
that needs the information, as shown in Figure 1-1.
1-1
Chapter 1 Multicast Overview