A comprehensive survey on Segment Routing Traffic Engineering
A comprehensive survey on Segment Routing Traffic Engineering
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DOI：
10.1016/j.dcan.2022.02.006
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发表时间：
2022-02
期刊：
影响因子：
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通讯作者：
Duo Wu;Lin Cui
中科院分区：
文献类型：
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作者：
Duo Wu;Lin Cui
流量工程 (TE) 能够以高效、平衡的方式优化网络资源的利用来管理流量。然而，现有的 TE 解决方案面临着可扩展性和复杂性方面的问题。近年来，分段路由（SR）已成为一种有前途的源路由范例。作为 SR 最重要的应用之一，分段路由流量工程 (SR-TE) 使前端能够沿着特定路径引导流量，这些路径表示为称为分段列表的有序指令列表，由于其灵活性和可扩展性，有能力克服上述挑战。在本文中，我们对SR-TE进行了全面的调查。首先对 SR-TE 架构进行了全面回顾，回顾了 SR-TE 的核心组件和实现，例如 SR 策略、灵活算法和 SR 原生算法。还讨论了 SR-TE 的优势及其主要挑战。接下来，我们详细介绍最近 SR-TE 对路由优化的研究，其目的包括链路利用率、吞吐量、QoE（体验质量）和能耗的优化。随后研究了SR-TE的节点管理，包括SR节点部署和候选节点选择。最后，我们讨论了当前研究活动面临的挑战，并提出了未来值得探索的几个研究方向。
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 aheadendto steer traffic along specific paths represented as ordered lists of instructions calledsegment 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.