H3c-technologies H3C S3100V2 Series Switches Uživatelský manuál stáhnout pdf (Strana 9)

Multicast overview

NOTE:

This document focuses on the IP multicast technolo

y and device operations. Unless otherwise stated, the

term

multicast

in this document refers to IP multicast.

Introduction to multicast

As a technique that coexists with unicast and broadcast, the multicast technique effectively addresses the

issue of point-to-multipoint data transmission. By enabling high-efficiency point-to-multipoint data

transmission over a network, multicast greatly saves network bandwidth and reduces network load.

The multicast technology enables a network operator to easily provide new value-added services, such

as live webcasting, web TV, distance learning, telemedicine, web radio, real-time video conferencing,

and other bandwidth-critical and time-critical information services.

Comparison of information transmission techniques

Unicast

In unicast transmission, the information source must send a separate copy of information to each host that

needs the information.

Figure 1 Unicast transmission

In Figure 1, assume that Host B, Host D and Host E need the information. A separate transmission channel

must be established from the information source to each of these hosts.

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H3c-technologies H3C S3100V2 Series Switches Uživatelský manuál Strana 9