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Hybrid routing by Joint Optimization of Per-Flow routing and tag-based routing in Software-Defined Networks

Tsinghua Science and Technology 2018年第4期23卷 440-452页

作者： Gongming Zhao Liusheng Huang Ziqiang Li Hongli Xu School of Computer Science and Technology University of Science and Technology of China Hefei 230027 China Institute for Advanced Study University of Science and Technology of China Suzhou 215123 China

In recent years, Software-Defined Networks （SDNs） have become a promising technology to improve network utilization. However, limited flow table size and long deployment delays may result in low network performance in large-scale networks and a poor user experience. While a typical solution to this issue is routing aggregation （i.e., wildcard routing）, the aggregation feasibility problem and reduced network performance may be encountered. To address this dilemma, we first design a novel wildcard routing scheme, called the tag-based Rule Placement Scheme （TRPS）. We then formulate a Hybrid routing by Joint optimization of Per-flow routing and tag- based routing （HR-JPT） problem, and prove its NP-hardness. An algorithm with a bounded approximation factor is designed for this problem, and the proposed methods are implemented on a Mininet platform. Extensive simulation results show that our methods are efficient for wildcard/hybrid routing. For example, our proposed tag-based wildcard rule placement scheme can reduce the number of required rules by about 65% on average compared with previous wildcard routing methods. Our proposed hybrid routing algorithm can increase network throughput by about 43% compared with existing hybrid routing solutions.

关键词： Software Defined Networks (SDNs) load balancing per-flow routing tag-based routing flow table sizeconstraint deployment delay constraint

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