Segment Routing in Software Defined Networks: A Survey
Segment Routing in Software Defined Networks: A Survey
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DOI：
10.1109/comst.2018.2869754
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发表时间：
2019
影响因子：
35.6
通讯作者：
Zahra'a Abdullah;Imtiaz Ahmad;I. Hussain
中科院分区：
文献类型：
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作者：
Zahra'a Abdullah;Imtiaz Ahmad;I. Hussain
分段路由(SR)是一种很有前途的源路由方法，用来克服现有路由方案中的挑战。由于它的灵活性、可扩展性和适用性，特别是在软件定义的网络中，它在工业界和学术界都受到了显著的关注。新兴的云服务需要严格的服务级别协议，如丢包、延迟和抖动。研究表明，传统的网络体系结构缺乏必要的灵活性和可扩展性来提供这些服务。为了应对这一问题，更灵活和敏捷的SR路由范例使源节点能够沿着性能工程路径引导传入的分组，该路径表示为称为段列表的有序指令列表。这被编码为分组报头中的多协议标签交换标签堆栈或IPv6地址列表。本文通过描述其体系结构、操作和迄今的关键应用，对新的SR技术进行了全面的综述。SR范式可以有效地应用于流量工程、网络弹性、网络监控、服务功能链接等广泛的网络应用，实现高效的网络解决方案。此外，本文还确定了一组有趣的未来研究方向和有待解决的问题，有助于实现新兴SR范式的全部潜力。
Segment routing (SR) has emerged as a promising source-routing methodology to overcome the challenges in the current routing schemes. It has received noticeable attention both in industry and academia, due to its flexibility, scalability, and applicability, especially in software defined networks. The emerging cloud services require strict service level agreements such as packet loss, delay, and jitter. Studies have shown that traditional network architectures lack the essential flexibility and scalability to offer these services. To combat this, a more flexible and agile routing paradigm of SR enables a source node to steer an incoming packet along a performance engineered path represented as an ordered list of instructions called segment list. This is encoded as a multiprotocol label switching label stack or an IPv6 address list in the packet header. This paper provides a comprehensive review of the novel SR technology by describing its architecture, operations, and key applications to date. SR paradigm can be effectively applied to a wide range of network applications, such as traffic engineering, network resiliency, network monitoring, and service function chaining, to achieve efficient network solutions. Furthermore, this paper identifies an interesting set of future research directions and open issues that can help realize the full potential of the emergent SR paradigm.