基于可靠性的服务功能链构建算法
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摘要
随着网络规模及内容数量不断扩大,网络运营商经常面临数据传输的中断问题,如何提高数据传输的可靠性成为研究热点。从NFV环境相比传统TCP/IP架构所具有的巨大优势入手,基于网络节点具备安全服务能力的背景,提出了一种构建服务功能链的可靠性算法。首先,介绍了网络拓扑的结构,将其抽象为有向图进行建模分析。其次,量化指标,设计了相应算法对失效概率的上下界进行界定并采用启发式算法对模型求解。实验结果表明,所提选路算法对服务链的可靠性提升幅度较高其耗时更少。
With the continuous expansion of network size and content quantity,network operators often face the problem of data transmission interruption,thus how to improve the reliability of data transmission has become a research hotspot.Started with the huge advantages of NFV environment over traditional TCP/IP architecture based on the background that every network node has the capability of security service,a reliability algorithm for constructing functional service chains was proposed.First,the network topology was introduced and abstracted it into a digraph for a better analyzation.Then,several quantitative indices were used to define the upper and lower bounds of failure probability and resolved the model through a heuristic algorithm.The experimental results show that the proposed algorithm increases the reliability of service chain selection and spends less time.
With the continuous expansion of network size and content quantity,network operators often face the problem of data transmission interruption,thus how to improve the reliability of data transmission has become a research hotspot.Started with the huge advantages of NFV environment over traditional TCP/IP architecture based on the background that every network node has the capability of security service,a reliability algorithm for constructing functional service chains was proposed.First,the network topology was introduced and abstracted it into a digraph for a better analyzation.Then,several quantitative indices were used to define the upper and lower bounds of failure probability and resolved the model through a heuristic algorithm.The experimental results show that the proposed algorithm increases the reliability of service chain selection and spends less time.
引文
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[2]李雪.异构网络环境下TCP性能分析及其重传定时机制研究[D].重庆:重庆邮电大学,2008.LI X.TCP performance analysis and retransmission timing mechanism in heterogeneous network environment[D].Chongqing:Chongqing University of Post and Telecommunications,2008.
[3]ANJA F.Internet clean-slate design:what and why?[J].ACM SIG-COMM Computer Communication Review,2007,37(3):59-64.
[4]DAVE T.OpenFlow:enabling innovation in campus networks[J].SIGCOMM Computer Communication Review,2008,38(2):69-74.
[5]CHIOSI M,CLARKE D,WILLIS P,et al.Network functions virtualization-introductory white paper[C]//SDN and OpenFlow World Congress.2012.
[6]CARAPINHA J.Network virtualization:a view from the bottom[C]//ACM SIGCOMM Workshop on Virtualized Infrastructure Systems and Architectures.2009:73-80.
[7]BHAMARE D,JAIN R,SAMAKA M,et al.A survey on service function chaining[J].Journal of Network and Computer Applications,2016,75:138-155.
[8]HWANG J,RAMAKRISHNAN K K,WOOD T.Net VM:high performance and flexible networking using virtualization on commodity platforms[J].IEEE Transactions on Network&Service Management,2015,12(1):34-47.
[9]周桥,伊鹏,门浩崧.基于资源效用最大化的虚拟网络功能备份方法[J].计算机应用,2017(4):40-45.ZHOU Q,YI P,MEN H S.Virtual network function backup method based on resource utility maximization[J].Journal of Computer Application,2017(4):40-45.
[10]LEE W,CHOI Y H,KIM N.Study on virtual service chain for secure software-defined networking[C]//The International Conference on Control and Automation.2013:177-180.
[11]熊钢,胡宇翔,段通,等.一种软件定义网络的安全服务链动态组合机制[J].电子与信息学报,2016,38(5):1234-1241.XIONG G,HU Y X,DUAN T,et al.A dynamic composition mechanism for the security service chain oriented software defined networking[J].Journal of Electronics&Information Technology,2016,38(5):1234-1241.
[12]GUSHCHIN A,WALID A,TANG A.Scalable routing in SDN-enabled networks with consolidated middle boxes[C]//ACM SIG-COMM Workshop on Hot Topics in Middle boxes and Network Function Virtualization.2015:55-60.
[13]LONG Q,ASSI C,SHABAN K,et al.A reliability-aware network service chain provisioning with delay guarantees in NFV-enabled enterprise datacenter networks[J].IEEE Transactions on Network&Service Management,2017(99):1.
[14]VALIANT L G.The complexity of enumeration and reliability problems[J].Siam Journal on Computing,1979,8(3):410-421.
[15]ZHANG J,MODIANO E.Robust routing in Interdependent Networks[C]//IEEE INFOCOM 2017-IEEE Conference on Computer Communication.2017:1-9.
[16]孔繁甲,王光兴.基于容斥原理与不交和公式的一个计算网络可靠性方法[J].电子学报,1998,26(11):117-119.KONG F J,WANG G X.A method for computing reliability of networks based on inclusion-exclusion principle and the disjoint sum formula[J].Acta Electrica Sinica,1998,26(11):117-119.
[17]GATTERBAUER W,SUCIU D.Oblivious bounds on the probability of boolean functions[J].ACM Transactions on Database Systems,2014,39(1):5.
[18]YUAN S,VARMA S,JUE J P.Minimum-color path problems for reliability in mesh networks[C]//Joint Conference of the IEEE Computer and Communications Societies.IEEE,2005:2658-2669.