MPLS Multicast Encapsulations
MPLS Multicast Encapsulations
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DOI：
10.17487/rfc5332
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发表时间：
2008-08
期刊：
影响因子：
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通讯作者：
Toerless Eckert;E. Rosen;R. Aggarwal;Y. Rekhter
中科院分区：
文献类型：
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作者：
Toerless Eckert;E. Rosen;R. Aggarwal;Y. Rekhter
RFC 3032为MPLS建立了两个数据链路层码点，用于区分数据链路层帧携带的是MPLS单播报文还是MPLS组播报文。然而，这种用法从未部署过。该规范通过重新定义这两个码点的含义来更新RFC 3032。这两个码点现在都可以用来承载组播分组。第二个代码点(以前的“多播代码点”)现在仅用于多路访问媒体，其意思是“后续标签堆栈的顶部标签是上游分配的标签”。RFC 3032没有指定要放置在承载MPLS多播分组的以太网帧的“MACDA”字段中的目的地地址。本文档提供了该规范。本文档更新了RFC 3032和RFC 4023。
RFC 3032 established two data link layer codepoints for MPLS, used to distinguish whether the data link layer frame is carrying an MPLS unicast or an MPLS multicast packet. However, this usage was never deployed. This specification updates RFC 3032 by redefining the meaning of these two codepoints. Both codepoints can now be used to carry multicast packets. The second codepoint (formerly the "multicast codepoint") is now to be used only on multiaccess media, and it is to mean "the top label of the following label stack is an upstream- assigned label". RFC 3032 does not specify the destination address to be placed in the "MAC DA" field of an ethernet frame which carries an MPLS multicast packet. This document provides that specification. This document updates RFC 3032 and RFC 4023.