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随着互联网技术的发展,在Internet上产生了许多新的应用,其中不少是高带宽的多媒体应用,譬如网络视频会议、网络音频/视频广播、多媒体远程教育、远程会诊,但传统网络无法满足这些应用,于是人们提出各种方案:增加互连带宽、改变网络流量结构、IP组播技术等等,其中,IP组播技术有其独特的优越性:在组播网络中,即使用户数量成倍增长,主干带宽不需要随之增加。
With the development of Internet technology, many new applications have been developed on the Internet. Many of them are high bandwidth multimedia applications such as network video conferencing, network audio / video broadcasting, multimedia distance education and teleconsultation, but traditional networks can not satisfy These applications, so people put forward a variety of programs: increase interconnection bandwidth, change the network traffic structure, IP multicast technology, etc. Among them, IP multicast technology has its unique advantages: In the multicast network, even if the number of users into Double the growth, trunk bandwidth does not need to increase.