隨著Intemet上多媒體尤其是網絡視頻、網絡會議以及遠程直播等應用的發展，組播技術已經變得越來越重要，它可以幫助用戶節約寶貴的帶寬資源，有效地解決單點發送多點接收問題。在介紹了組播路由基本原理的基礎上，對Vxworks下組播路由體系結構進行了研究，并以DVMRP和PIM 兩個協議為例，從總體設計、組播任務、IP協議棧內核以及組播任務和內核的交互等幾個方面給出了它的初步實現。

With the development ofmultimedia especially some applications such as network video， netw ork meeting and remote living broadcast on Intemet， multicast technology has become more an d more important． It can save precious ban dwidth resource an d solve the problem that one point sends information but man y points receive． The basic principle ofmulticast routing is in~oduced an d the multicast routing architecture under Vxworks is analyzed，using DVMRP and PIM as exampl e，which principle is implemented from several aspects，such as total design，multicast routing task,IP protocol stack kernel an d the interaction betw een multicast routing task an d kerne1．