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MPLS-based reduction of flow table entries in SDN switches supporting multipath transmission

机译：支持多径传输的SDN交换机中的MPLS基于流表条目的减少

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摘要

In this paper, the problem of resource utilisation improvement in software-defined networking (SDN) is addressed. The need for resource optimisation is understood here be twofold. First, bandwidth in links should be saved when congestion appears. Second, the internal resources represented by table entries of SDN switches should be minimised to ensure fast processing and flexibility. Here, both types of resources are optimised with a new mechanism for flow aggregation. The mechanism is accompanied with a multipath transmission supporting reaction when network conditions change.The proposed mechanism uses classical MPLS labelling, which enables flow aggregation together with multipath transmission; therefore, neither involves any definition of new protocols nor requires the application of legacy signalling protocols. Only simple yet powerful modifications of the existing solutions assured by flexibility of the OpenFlow protocol are necessary. Furthermore, the proposed solution can be incrementally deployed in legacy networks.The aggregation results in a low number of flow entries in core switches in comparison to legacy OpenFlow operation. The simulations show that the number of flow entries in core switches can be reduced by as much as 93%, while the overall network traffic is increased by around 171%. This type of scalability improvement of flow processing is obtained as a result of the introduction of a centrally managed MPLS label distribution performed by an SDN controller. Moreover, the proposed method of multipath transmission improves network resource utilisation. Additionally, independently of the traffic pattern, the proposed approach significantly reduces the communication overhead between the controller and the switches.
机译：在本文中，解决了软件定义网络（SDN）的资源利用改进问题。这里可以理解对资源优化的需求是双重的。首先，在出现拥塞时，应保存链接中的带宽。其次，应最大限度地减少由SDN开关的表条目所示的内部资源，以确保快速处理和灵活性。这里，两种类型的资源都是用新的流聚合机制进行优化。当网络条件发生变化时，该机制伴随着多径传输支持反应。该提出的机制使用经典的MPLS标记，这使得流量聚集在一起与多径传输;因此，既不涉及新协议的任何定义，也不需要应用传统信令协议。仅需要通过开放流协议的灵活确保现有解决方案的简单而强大的修改是必要的。此外，所提出的解决方案可以逐步地部署在传统网络中。与遗留开放流操作相比，聚合导致核心开关中的少量流动条目。模拟表明，核心开关中的流动条目数可以减少多达93％，而整体网络流量增加约171％。由于引入由SDN控制器执行的集中管理的MPLS标签分布而获得了流处理的这种可扩展性改进。此外，所提出的多径传输方法提高了网络资源利用率。另外，独立于流量模式，所提出的方法显着降低了控制器和交换机之间的通信开销。

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