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标签分发是指一个标签交换路由器（LSR）向另一个LSR通告其标签 ／ 转发等价类的绑定信息。标签分发的过程实际上就是标签交换路径建立的过程。标签分发协议是MPLS的信令协议，因而在MPLS的体系结构中占有非常重要的地位。本文介绍了标签分发协议中的一些基本概念，并结合举例阐述了标签分发协议涉及到的标签操作和相应的消息处理过程。
Label distribution refers to a label switching router (LSR) to another LSR advertising its label / forwarding equivalence class binding information. The process of label distribution is actually the process of establishing a label switching path. The label distribution protocol is the signaling protocol of MPLS, and thus occupies a very important position in the MPLS architecture. This article introduces some basic concepts in the label distribution protocol, and explains the label operation and the corresponding message processing involved in the label distribution protocol.