软件定义网络中协同存储数据面快速转发  

Data plane fast forwarding of collaborative caching for software defined networking

作　　者：朱晓东[1,2] 王劲林 王玲芳[1] ZHU Xiaodong1,2, WANG Jlnlin1, WANG Lingfang1(1. National Network New Media Engineering Research Center, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China; 2. School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, Chin)

机构地区：[1]中国科学院声学研究所国家网络新媒体工程技术研究中心,北京100190 [2]中国科学院大学电子电气与通信工程学院,北京100049

出　　处：《计算机应用》2018年第8期2343-2347,共5页journal of Computer Applications

基　　金：国家科技重大专项(2017ZX03001019)~~

摘　　要：针对利用具备存储能力的网内节点进行协同存储需依据周边缓存状态快速转发数据包的问题,提出了一种数据面快速转发方法。该方法采用在交换机内对每一端口维护两个布隆过滤器(BF)的方式,实现在数据面对于周边缓存状态的维护;同时扩展了协议无感知转发指令,该指令直接查询BF,依据所查询结果,采用优化的转发流程转发数据包,实现依据周边缓存状态的快速转发。实验结果表明:依据控制器所维护状态进行转发在输入速率为80Kb/s即达到性能瓶颈,而所提方法可在111 Mb/s时线速转发数据包,且转发效率略优于协议无感知转发原本的直接转发指令;所采用的BF维护的方式内存开销最多仅为流表项维护周边缓存状态方式内存开销的20%。在具备存储能力的软件定义网络(SDN)中,采用所提方法可在数据面维护周边缓存状态,提升协同存储依据周边缓存状态转发数据包的效率。When using the in-network nodes with cache ability for collaborative caching,the packets need to be forward quickly according to the surrounding caching status. A new data-plane-fast-forwarding method was proposed for this problem.Two bloom filters were kept for each port in the switch to maintain the surrounding caching status at the data plane.Meanwhile,the action of protocol oblivious forwarding was also extended. The extended action searched the bloom filters directly,and the optimized forwarding process was used to forward packets according to the searching results,then the packets were forwarded quickly based on the surrounding caching status. The evaluation results show that the caching status maintained by the controller reaches the forwarding performance bottleneck when the input rate is 80 Kb/s. The packets can be forwarded at line speed when the input rate is 111 Mb/s by using the data-plane-fast-forwarding method,which efficiency of forwarding is superior to the output action of protocol oblivious forwarding. The memory overhead of maintaining caching status by using the bloom filter is up to 20% of that by using the flow table. In Software Defined Networking（ SDN） with cache ability,the proposed method can maintain the surrounding caching status at the data plane and promote the efficiency of forwarding packets by the surrounding caching status for collaborative caching.

关 键 词：软件定义网络 协议无感知转发 协同存储 信息中心网络 数据面 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]