Multicast Using Bit Index Explicit Replication (BIER)
Multicast Using Bit Index Explicit Replication (BIER)
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DOI：
10.17487/rfc8279
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发表时间：
2017-11
期刊：
影响因子：
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通讯作者：
IJsbrand Wijnands;E. Rosen;A. Dolganow;T. Przygienda;S. Aldrin
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文献类型：
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作者：
IJsbrand Wijnands;E. Rosen;A. Dolganow;T. Przygienda;S. Aldrin
本文件规定了一种用于转发多播数据包的新架构。它通过“多播域”提供多播数据包的最佳转发。然而，它不需要显式构建多播分发树的协议，也不需要中间节点来维护任何每个流的状态。这种架构称为“位索引显式复制”(BIER)。当组播数据包进入域时，入口路由器确定该数据包需要发送到的一组出口路由器。然后，入口路由器将数据包封装在 BIER 标头中。 BIER 标头包含一个位串，其中每个位恰好代表域中的一个出口路由器；为了将数据包转发到给定的一组出口路由器，与这些路由器相对应的位在 BIER 标头中设置。本文档中指定了基于 BIER 标头转发数据包的过程。消除每个流状态和显式的树构建协议会导致相当大的简化。
This document specifies a new architecture for the forwarding of multicast data packets. It provides optimal forwarding of multicast packets through a "multicast domain". However, it does not require a protocol for explicitly building multicast distribution trees, nor does it require intermediate nodes to maintain any per-flow state. This architecture is known as "Bit Index Explicit Replication" (BIER). When a multicast data packet enters the domain, the ingress router determines the set of egress routers to which the packet needs to be sent. The ingress router then encapsulates the packet in a BIER header. The BIER header contains a bit string in which each bit represents exactly one egress router in the domain; to forward the packet to a given set of egress routers, the bits corresponding to those routers are set in the BIER header. The procedures for forwarding a packet based on its BIER header are specified in this document. Elimination of the per-flow state and the explicit tree- building protocols results in a considerable simplification.