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多播（ｍｕｌｔｉｃａｓｔ）是未来Ｉｎｔｅｒｎｅｔ中的一项重要业务。多播路由技术建立在点到点路由技术的基础上，但在寻路机制和路由结构上有很大区别。本文介绍了ＩＰ多播机制、路由树的类型，以及目前已经应用的典型协议。
Multicast is an important business in the future Internet. Multicast routing technology is based on point-to-point routing technology, but there is a big difference between routing mechanism and routing structure. This article describes the IP multicasting mechanism, the type of routing tree, and the typical protocols that are currently in use.