摘要： 针对软件定义网络中数据平面三态内容寻址存储器（TCAM）性能受限导致的流表下发拥塞问题，提出一种基于流重定向的多协议标签交换算法。利用源节点交换机流重定向和路径交换机下放MPLS标签的方法，占用部分数据链路带宽来缓解TCAM更新流表速率过慢的情况，同时增大系统容量。实验结果表明，与传统OSPF算法相比，该算法可以减小60%的链路负载和近90%的流表项插入延时，并能够增加最多200%的系统容量。

关键词: 软件定义网络, 控制链路, 流量优化, 流重定向, 多协议标签交换

Abstract: To address the congestion of flow table distribution caused by limited performance of data plane Ternary Content Addressable Memory(TCAM) in Software-Defined Network(SDN),this paper proposes a Multi-Protocol Label Switching(MPLS) algorithm based on flow redirection.The algorithm utilizes the flow redirection method of the source node switch and the MPLS label decentralization method of the path switch,and occupies a part of the data link bandwidth to alleviate the problem that the flow table update rate of TCAM is too low.Also,the system capacity is increased.Experimental results show that compared with the traditional OSPF algorithm,the proposed algorithm reduces the link load by up to 60% and the insertion delay of flow table items by nearly 90%,while increasing the system capacity by up to 200%.

Key words: Software-Defined Network(SDN), control link, flow optimization, flow redirection, Multi-Protocol Label Switching(MPLS)

中图分类号: 

• TP311