基于BIER的SDN组播交换机BIFT快速构建  

Fast construction of the Bit Index Forwarding Table of switches for BIER-based multicasting in SDNs

作　　者：刘艳萍[1] 杨喜敏[1] 冯伟 唐菀[1] LIU Yanping;YANG Ximin;FENG Wei;TANG Wan(College of Computer Science, South-Central University for Nationalities, Wuhan 430074, China;Hylera Communication Limited Company, Shenzhen 518000,China)

机构地区：[1]中南民族大学计算机科学学院,武汉430074 [2]海能达通信股份有限公司,深圳518000

出　　处：《中南民族大学学报（自然科学版）》2021年第3期292-297,共6页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：国家自然科学基金资助项目(61902437);湖北省自然科学基金资助项目(2020CFB629)。

摘　　要：位索引显式复制(BIER)组播网络中交换机的位索引转发表(BIFT)是组播报文转发的核心所在.基于提出的考虑组播报文接收者的组播路由子树分类模式,设计的BIFT生成算法C3-BIFT通过在一次组播路由树回溯过程中进行子树合并和分类,为所有软件定义网络(SDN)交换机构建位索引转发表.在组播组成员发生变化时,能快速重构组播网络中各交换机的BIFT,强化BIER的适应性.实验结果表明:相对于常规基于SDN架构的组播网络,组播接收者引入BIER的组播网络的延迟更稳定,C3-BIFT算法对流表的更新时间和组播加入延迟影响很小.The Bit Index Forwarding Table(BIFT)of a switch in the multicast based on Bit Index Explicit Replication(BIER)is the core of multicast packet forwarding.A multicast routing subtree classification mode according to multicast message receivers is proposed.The BIFT constructor based on classifying and combining algorithm named C3-BIFT is designed to build bit index forwarding tables for all multicast switching institutions in the Software-Defined Networking(SDN)by merging and classifying the subtrees in the process of multicast tree backtracking.When the group members of the multicast change,the BIFT contained in each switch in the multicast network can be quickly reconstructed to strengthen the adaptability of BIER.The experimental results show that the delay of the receiver joining the multicast introducing BIER is more stable than the conventional multicast in the SDN,and the proposed C3-BIFT algorithm has little impact on the update time of flow table and the delay of multicast joining.

关 键 词：软件定义网络 组播 位索引显式复制 位索引转发表 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]