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 an...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.展开更多
随着互联网规模扩展和拓扑结构的变化,网络管理面临巨大挑战。分段路由(segment routing,SR)协议,特别是SRv6(segment routing over IPv6),因其高可编程性和可扩展性,成为研究热点。基于SRv6的路径优化控制机制,解决多需求、多场景下特...随着互联网规模扩展和拓扑结构的变化,网络管理面临巨大挑战。分段路由(segment routing,SR)协议,特别是SRv6(segment routing over IPv6),因其高可编程性和可扩展性,成为研究热点。基于SRv6的路径优化控制机制,解决多需求、多场景下特定节点规避与中转问题,以提高网络性能。提出了针对完全部署SRv6网络的路径转移方案,通过分叉路径优化减少路由开销。针对部分部署网络,定义关键路径并设计规避与中转路径转发方案,优化路径转发效率。实验结果表明,完全部署SRv6时,优化方案能有效减小段列表深度,减少路由开销;在部分部署网络中,仅少量SRv6节点即可实现接近全SRv6网络的性能,成功解决特定节点规避与中转问题。研究结果为SRv6在不同网络部署中的应用提供了有效支持。展开更多
基金partially supported by Chinese National Research Fund(NSFC)No.62172189 and 61772235Natural Science Foundation of Guangdong Province No.2020A1515010771Science and Technology Program of Guangzhou No.202002030372.
文摘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.
文摘随着互联网规模扩展和拓扑结构的变化,网络管理面临巨大挑战。分段路由(segment routing,SR)协议,特别是SRv6(segment routing over IPv6),因其高可编程性和可扩展性,成为研究热点。基于SRv6的路径优化控制机制,解决多需求、多场景下特定节点规避与中转问题,以提高网络性能。提出了针对完全部署SRv6网络的路径转移方案,通过分叉路径优化减少路由开销。针对部分部署网络,定义关键路径并设计规避与中转路径转发方案,优化路径转发效率。实验结果表明,完全部署SRv6时,优化方案能有效减小段列表深度,减少路由开销;在部分部署网络中,仅少量SRv6节点即可实现接近全SRv6网络的性能,成功解决特定节点规避与中转问题。研究结果为SRv6在不同网络部署中的应用提供了有效支持。
