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标签分配协议是MPLS技术的控制协议 ,也是MPLS的核心。它相当于传统信令中的信令协议 ,负责转发等价类的分类、标签的分配、分配结果的传输及LSP的建立和维护等一系列操作。分6个部分描述与LDP有关的内容 ,其中包括 :与标签、标签分配协议等相关的概念 ;LDP规范中规定的LDPPDU、消息、TLV等的结构 ;LDP的功能和工作的 4个阶段 ;标签的分配和管理技术 ;LDP与BGP和LIB的关系 ;对LDP的扩展—CR LDP等内容。
Label distribution protocol is MPLS technology control protocol, but also the core of MPLS. It is equivalent to the signaling protocol in traditional signaling. It is responsible for the classification of forwarding equivalence classes, the assignment of labels, the transmission of allocation results, and the establishment and maintenance of LSPs. It describes the LDP related content in six sections, including: concepts related to labels and label distribution protocols; the structure of LDPPDUs, messages, TLVs and the like specified in the LDP specification; the four phases of the LDP’s functions and work; The distribution and management technology; LDP and BGP and LIB relations; extension of LDP-CR LDP and so on.