Abstract
Ternary Content Addressable Memory (TCAM) is widely used for caching flow entries in Software Defined Network (SDN). However, limited by the current technology level and hardware cost, the capacity of TCAM is difficult to meet the needs for caching flow entries of large scale SDN, which would seriously affect the scalability of SDN. Aimed at the problem, some researches improve the efficiency of TCAM capacity by setting different lifecycle for different flow entries. Such as Openflow protocol proposed the default flow entry lifecycle, AHTM scheme dynamicly adjusted flow entry lifecycle according to the number of interrupted flows. However, these schemes didn't consider the dynamic features of network traffic in SDN, and hardly conform to the actual network demands. In order to effectively utilize TCAM capacity and thus enhance the scalability of SDN, we propose TF-IdleTimeout scheme to dynamically set flow entry lifecycle according to real-time network traffic in SDN-based data center network. Two criterion, called Flow Entry Missing Number and Flow Dropping Number, are used to evaluate the effect. The results show that, compared with existing schemes, TF-IdleTimeout scheme can greatly improve the utilization efficiency of TCAM capacity in SDN.
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