隨著Intemet上多媒體尤其是網(wǎng)絡(luò)視頻、網(wǎng)絡(luò)會(huì)議以及遠(yuǎn)程直播等應(yīng)用的發(fā)展，組播技術(shù)已經(jīng)變得越來(lái)越重要，它可以幫助用戶節(jié)約寶貴的帶寬資源，有效地解決單點(diǎn)發(fā)送多點(diǎn)接收問(wèn)題。在介紹了組播路由基本原理的基礎(chǔ)上，對(duì)Vxworks下組播路由體系結(jié)構(gòu)進(jìn)行了研究，并以DVMRP和PIM 兩個(gè)協(xié)議為例，從總體設(shè)計(jì)、組播任務(wù)、IP協(xié)議棧內(nèi)核以及組播任務(wù)和內(nèi)核的交互等幾個(gè)方面給出了它的初步實(shí)現(xiàn)。

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．