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Port Based Capacity Extensions (PBCEs): Improving SDNs Flow Table Scalability

机译:基于端口的容量扩展(PBCE):提高SDN流表的可伸缩性

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Software-defined networks (SDNs) come with great promises regarding flexible operation of networks. A key component within SDN-switches is the flow table which holds the rules that determine how data streams are handled. The flow table, however, is a scarce resource with a rather limited rule capacity. To soften this well-known hassle, we propose a novel delegation mechanism for OpenFlow-based SDNs called Port Based Capacity Extension (PBCE). PBCE provides the possibility to delegate flows from a switch with many flow table entries to another less loaded neighboring switch without breaking control plane transparency, i.e., without interfering with existing SDN applications. To do so, PBCE uses flow rule aggregation based on ingress ports and a small number of special rules for both switches. In this paper, we present the PBCE delegation middleware along with a prototypical implementation and first promising performance results that demonstrate the feasibility of the approach.
机译:软件定义网络(SDN)对于网络的灵活运行有着广阔的前景。 SDN交换机中的关键组件是流表,其中包含确定如何处理数据流的规则。但是,流表是一种稀缺资源,其规则容量非常有限。为了缓解这一众所周知的麻烦,我们为基于OpenFlow的SDN提出了一种新颖的委托机制,称为基于端口的容量扩展(PBCE)。 PBCE提供了将具有多个流表条目的交换机的流委派给另一个负载较小的相邻交换机的功能,而又不会破坏控制平面的透明性,即不会干扰现有的SDN应用程序。为此,PBCE使用基于入口端口的流规则聚合和两个交换机的少量特殊规则。在本文中,我们介绍了PBCE委派中间件,以及一个原型实现和首个有前途的性能结果,这些结果证明了该方法的可行性。

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