摘要： 分析了MPLS转发中的3个主要逻辑结构：ILM、NHLFE和FTN，同时给出了每个逻辑结构内的主要处理细节。详细分析了3个逻辑结构在Linux系统中的具体实现，并分析了比较有代表性的MPLS隧道实现。最后，针对实现中关于FEC定义上的不足，在FEC定义中增加了第4层信息，并给出了实现的方法。

关键词: 多协议标记交换, 入标记映射, 下一跳标记转发项, 转发等价类, MPLS隧道

Abstract: This peper analyzes the three main logical components of Linux forwarding architecture: ILM, NHLFE and FTN. It also gives the main process in each component . Then it particularly analyzes the implementation of the three components under Linux. It also analyzes the implementation of the MPLS tunnel. Aims at that in the implementation, the FECs definition does not include the layer 4 information.It provides an improved FEC definition and subsequently gives the implementation method.

中图分类号: 

• TP393