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近年来,计算机网络的发展有目共睹,随着网络技术的发展,许多单一媒体相继成为网络传输中的数据, 各种媒体的融合使得网络多媒体运用层出不穷,其中不少是高带宽的多媒体应用。在网络上实现的视频点播(VOD) 、可视电话、视频会议等音视频业务和一般业务相比,有着数据量大、时延敏感性强、持续时间长等特点。因此采用最少时间、最小空间来传输和解决音视频业务所要求的网络利用率高、传输速度快、实时性强的问题,就要采用不同于传统单播、广播机制的转发技术及QoS服务保证机制来实现,而IP组播技术是解决这些问题的关键技术。
In recent years, the development of computer network is obvious to all. With the development of network technology, many single media have become the data in network transmission one after another. The integration of various media makes the use of network multimedia endlessly, many of them are high bandwidth multimedia applications. VOD, videophone, video conferencing and other audio and video services implemented on the network have the characteristics of large amount of data, strong delay sensitivity and long duration as compared with the general business. Therefore, using the minimum time and minimum space to transmit and solve the problems of high network utilization, fast transmission and high real-time performance required by audio and video services, it is necessary to adopt a different forwarding technology and QoS service guarantee than traditional unicast and broadcast mechanisms Mechanism to achieve, and IP multicast technology is the key technology to solve these problems.