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A comprehensive survey on segment routing Traffic Engineering

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数字通信与网络:英文版 2023年第4期9卷 990-1008页

作者： Duo Wu Lin Cui Department of Computer Science Jinan UniversityGuangzhou510632China

Traffic Engineering(TE)enables management of traffic in a manner that optimizes utilization of network resources in an efficient and balanced manner.However,existing TE solutions face issues relating to scalability and complexity.In recent years,segment routing(SR)has emerged as a promising source routing paradigm.As one of the most important applications of SR,segment routing Traffic Engineering(SR-TE),which enables a headend to steer traffic along specific paths represented as ordered lists of instructions called segment lists,has the capability to overcome the above challenges due to its flexibility and scalability.In this paper,we conduct a comprehensive survey on SR-TE.A thorough review of SR-TE architecture is provided in the first place,reviewing the core components and implementation of SR-TE such as SR Policy,Flexible Algorithm and SR-native algorithm.Strengths of SR-TE are also discussed,as well as its major challenges.Next,we dwell on the recent SR-TE researches on routing optimization with various intents,e.g.,optimization on link utilization,throughput,QoE(Quality of Experience)and energy consumption.Afterwards,node management for SR-TE are investigated,including SR node deployment and candidate node selection.Finally,we discuss the existing challenges of current research activities and propose several research directions worth of future exploration.

关键词： segment routing Traffic engineering SR Policy routing optimization segment list computation

Traffic Engineering in Dynamic Hybrid segment routing Networks

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Computers, Materials & Continua 2021年第7期68卷 655-670页

作者： Yingya Guo Kai Huang Cheng Hu Jiangyuan Yao Siyu Zhou College of Mathematics and Computer Science Fuzhou UniversityFuzhou350000China Fujian Key Laboratory of Network Computing and Intelligent Information Processing Fuzhou UniversityFuzhou350000China Key Laboratory of Spatial Data Mining&Information Sharing Ministry of EducationFuzhou350003China School of Information Science and Technology Guangdong University of Foreign StudiesGuangzhou510006China School of Computer Science and Cyberspace Security Hainan UniversityHaiKou570228China Tandon School of Engineering New York UniversityNew York10012USA Department of Computing Hong Kong Polytechnic UniversityHong Hom999077Hong Kong

The emergence of segment routing(SR)provides a novel routing paradigm that uses a routing technique called source packet routing.In SR architecture,the paths that the packets choose to route on are indicated at the ingress router.Compared with shortest-path-based routing in traditional distributed routing protocols,SR can realize a flexible routing by implementing an arbitrary flow splitting at the ingress router.Despite the advantages of SR,it may be difficult to update the existing IP network to a full SR deployed network,for economical and technical reasons.Updating partial of the traditional IP network to the SR network,thus forming a hybrid SR network,is a preferable choice.For the traffic is dynamically changing in a daily time,in this paper,we propose a Weight Adjustment algorithm WASAR to optimize routing in a dynamic hybrid SR network.WASAR algorithm can be divided into three steps:firstly,representative Traffic Matrices(TMs)and the expected TM are obtained from the historical TMs through ultrascalable spectral clustering algorithm.Secondly,given the network topology,the initial network weight setting and the expected TM,we can realize the link weight optimization and SR node deployment optimization through a Deep Reinforcement Learning(DRL)algorithm.Thirdly,we optimize the flow splitting ratios of SR nodes in a centralized online manner under dynamic traffic demands,in order to improve the network performance.In the evaluation,we exploit historical TMs to test the performance of the obtained routing configuration in WASAR.The extensive experimental results validate that our proposed WASAR algorithm has superior performance in reducing Maximum Link Utilization(MLU)under the dynamic traffic.

关键词： Traffic engineering routing optimization segment routing deep reinforcement learning ultra-scalable spectral clustering

基于SDN的segment routing网络的优化设计与实现

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基于SDN的Segment Routing网络的优化设计与实现

作者：毛健炜北京邮电大学

学位级别：硕士

近两年受业界广泛关注的segment routing(SR)技术被认为是继MPLS之后新一代的网络技术。它较好地将SDN集中式控制思想与分布式路由计算方法相结合。数据平面利用成熟的路由协议基于IP路由模型建立去往其他网元的最佳路径,控制平面基于... 详细信息

近两年受业界广泛关注的segment routing(SR)技术被认为是继MPLS之后新一代的网络技术。它较好地将SDN集中式控制思想与分布式路由计算方法相结合。数据平面利用成熟的路由协议基于IP路由模型建立去往其他网元的最佳路径,控制平面基于全局网络视图做出最优路由决策,负责指明流量需要经过的关键网元路径点。SR提供了稳定可靠又灵活可控的流量调度方式,在路由组网和故障保护方面做了很多努力。本文针对基于SDN的segment routing网络在路由与组网、故障处理、性能遥测方面进行了优化设计与实现。在路由与组网方面,主要扩展了SR网络的导流能力。基于P4可编程数据平面,设计了支持关键路径点与逐跳路径点两种隧道形式的源路由方案,既能够使网络具备细粒度规划端到端流量路径的能力,又具备明确指定路径以避开潜在故障点的能力,能够避免SR网络中各网元路由信息不一致的暂态对故障保护的有效性造成影响。在故障检测方面,设计了基于邻居保活与被动检测思想的检测方法,降低了带宽开销;将检测方法在设备数据平面实现,降低了检测的性能开销,同时增强了故障发现的灵敏度。为实现SR网络全网<50ms的故障检出和故障保护目标提供了新的方法和可能性。在故障保护方面,为了实现对流量的快速应急保护,设计了包含三种保护方法的故障点就近保护方案,以及保护过程的闭环反馈机制,使得多种保护方案互为备份。设计了基于约束式广播传递的故障通告机制,以及源点主备隧道倒换的保护方案,在流量入口确保流量在受保护时依然在全程最优的路径上转发。保护过程由设备数据平面自主启用和执行,提高了保护措施的响应速度和执行效率。在性能遥测方面,针对带内遥测在丢包率高的情况下难以及时获得足够数据的问题,设计了逐跳推送与末端推送两种方式相结合的遥测方案。逐跳推送提高了数据采集的可靠性,同时管理平面只对末端推送进行详细分析,能够维持较低的处理负载。此外,能够按需以不同推送周期对不同流量进行遥测,使遥测功能可适用于多种流量类型,同时提高遥测效率。

关键词： SDN segment routing 故障检测故障保护性能遥测

基于segment routing的金融跨数据中心网络设计与验证

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电脑知识与技术 2020年第18期16卷 22-26页

作者：何朔祖立军袁航孙祥安中国银联股份有限公司上海201201 上海宽带技术及应用工程研究中心上海200436

由于金融机构业务的自身特点,其网络建设也比较特殊,物理层多采用"单区专线专用"的方式进行数据隔离,在网络层和应用层多采用IP路由技术,然后逐跳配置策略路由来进行路径控制,存在资源复用能力及突发情况应对能力不足。下一代金融跨中... 详细信息

由于金融机构业务的自身特点,其网络建设也比较特殊,物理层多采用"单区专线专用"的方式进行数据隔离,在网络层和应用层多采用IP路由技术,然后逐跳配置策略路由来进行路径控制,存在资源复用能力及突发情况应对能力不足。下一代金融跨中心网络互联方案设计以segment routing技术为基础,引入逻辑隔离、虚拟传输隧道的理念对网络进行了重新设计,并对该方案进行实际组网测试。在功能、性能都达到预期之后,方案在中国银联跨数据中心互联网络中部署应用。

关键词： segment routing 金融跨数据中心网络流量调度

基于P4的segment routing 设计方案

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电脑知识与技术 2021年第10期17卷 223-225页

作者：陈梅苏晨赵静雅高震宇北京电子科技职业学院电信工程学院北京100176

本文结合segment routing业内常使用的SR-MPLS转发平面的规则,设计了基于P4的segment routing方案。P4程序部分包括了基本转发逻辑和segment routing标签处理逻辑,用于在P4交换机上编译运行实现数据平面功能。使用ONOS控制器做segment R... 详细信息

本文结合segment routing业内常使用的SR-MPLS转发平面的规则,设计了基于P4的segment routing方案。P4程序部分包括了基本转发逻辑和segment routing标签处理逻辑,用于在P4交换机上编译运行实现数据平面功能。使用ONOS控制器做segment routing的控制平面指导流表的下发,底层P4交换机从ONOS控制器的通告中得知对每个segment的处理方法。

关键词： segment routing P4 软件定义网络协议无关

A Solution Supporting Secure Transmission of Big Data

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Tsinghua Science and Technology 2023年第5期28卷 838-848页

作者： Haonan Ling Yan Gao Huibin Wang Ming Chen Institute of Computer Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106China China Electronic Systems Engineering Corporation Beijing 100840China College of Computer and Information Engineering Chuzhou UniversityChuzhou 239000

Traditional Internet protocol networks cannot provide the service of selecting a secure path to transmit various types of data with specific security constraints.First,to solve the“secure path transmission”problem,this paper first proposes a search-transmit model for secure network path transmission,i.e.,to find a multi-attribute optimized path that meets the specific security requirements in the search phase,and then transmit the packets along the optimized path in the transmission phase.Second,we propose a solution to the search-transmit model.The idea of the solution is to use the particle swarm optimization algorithm to search for a secure path that meets the multi-attribute requirements and then set the source route on the router to control the packet transmission.Finally,a prototype system based on network function virtualization is developed to evaluate the feasibility and performance of the proposed solution.Experimental results show that the proposed solution outperforms existing algorithms in terms of performance.

关键词： network secure path search-transmit model multi-attribute path optimization segment routing network function virtualization

Traffic Engineering Based on Deep Reinforcement Learning in Hybrid IP/SR Network

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China Communications 2021年第10期18卷 204-213页

作者： Bo Chen Penghao Sun Peng Zhang Julong Lan Youjun Bu Juan Shen Information Technology Institute Information Engineering UniversityZhengzhou 450002China War Research Insititute Academy of Military ScienceBeijing 100091China

segment routing(SR)is a new routing paradigm based on source routing and provide traffic engineering(TE)capabilities in IP network.By extending interior gateway protocol(IGP),SR can be easily applied to IP network.However,upgrading current IP network to a full SR one can be costly and difficult.Hybrid IP/SR network will last for some time.Aiming at the low flexibility problem of static TE policies in the current SR networks,this paper proposes a Deep Reinforcement Learning(DRL)based TE scheme.The proposed scheme employs multi-path transmission and use DRL to dynamically adjust the traffic splitting ratio among different paths based on the network traffic distribution.As a result,the network congestion can be mitigated and the performance of the network is improved.Simulation results show that our proposed scheme can improve the throughput of the network by up to 9%than existing schemes.

关键词： SDN deep reinforcement learning segment routing traffic engineering equal cost multiple paths

基于应用驱动的商业银行智能核心网流量模型设计与实践

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中国金融电脑 2022年第6期 77-80页

作者：郑倚志黄雯霆江洋兴业银行数据中心

数字化转型浪潮下,兴业银行针对“构建连接一切的能力,打造最佳生态赋能银行”的发展目标,提出了新一代核心网建设项目。实践中,兴业银行基于应用驱动的核心网SD-WAN流量工程解决方案,通过引入多种新兴广域网流量工程技术,并结合应用驱... 详细信息

数字化转型浪潮下,兴业银行针对“构建连接一切的能力,打造最佳生态赋能银行”的发展目标,提出了新一代核心网建设项目。实践中,兴业银行基于应用驱动的核心网SD-WAN流量工程解决方案,通过引入多种新兴广域网流量工程技术,并结合应用驱动流量模型,构建了行内所有分支机构之间端到端的流量调度能力,显著提升了核心网的流量管理水平。

关键词： SD-WAN segment routing 流量工程应用驱动

Fast network restoration with equivalent cooperative routing

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Journal of Communications and Information Networks 2017年第3期2卷 10-17页

作者： Fang Dong Jianyang Huang Penghao Sun Yuxiang Hu National Digital Switching System Engineering&Technological R&D Center Zhengzhou 450002China

Aiming at the problem of failure recovery in current networks,a fast failure recovery method based on equivalent cooperative routing is proposed.Firstly,the transmission path between the source and destination nodes is divided into several non-overlapping path segments.Next,backup paths are deployed for each link in the path segment through segmented routing technology,which ensures fast routing recovery after failure.Additionally,in order to avoid damaging the QoS of the data stream through the failure recovery process,the transmission is guaranteed by the intersegment QoS complement.The experimental results show that the proposed method has a low failure recovery delay under a relatively small flow table cost.

关键词： fast failure recovery backup path segment routing equivalent cooperative routing