Multicasting is used within local-area networks to make distributed applications more robust and more efficient. The growing need to distribute applications across multiple, interconnected networks, and the increasing availability of high-performance, high-capacity switching nodes and networks, lead us to consider providing LAN-style multicasting across an internetwork. In this paper, we propose extensions to two common internetwork routing algorithms---distance-vector routing and link-state routing---to support low-delay datagram multicasting. We also suggest modifications to the single-spanning-tree routing algorithm, commonly used by link-layer bridges, to reduce the costs of multicasting in large extended LANs. Finally, we show how different link-layer and network-layer multicast routing algorithms can be combined hierarchically to support multicasting across large, heterogeneous internetworks.
多播用于局域网中,以使分布式应用程序更健壮和更高效。在多个互连的网络上分发应用程序的需求不断增长,以及高性能,大容量的交换节点和网络的可用性不断提高,这促使我们考虑在整个互联网络上提供LAN样式的多播。在本文中,我们提出了对两种常见的互联路由算法的扩展,即距离矢量路由和链接状态路由,以支持低延迟数据报多播。我们还建议对链路层桥通常使用的单生成树路由算法进行修改,以减少大型扩展LAN中的多播成本。最后,我们展示了如何将不同的链路层和网络层多播路由算法进行分层组合,以支持跨大型异构Internet的多播。 P>
Stanford Univ., Stanford, CA;
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