دانلود رایگان مقاله مدیریت کارآمد عدم تطابق بسته بافر برای شبکه های اوپن فلو

Abstract

OpenFlow-based networks simplify network management and improve network programmability by centralized network control. Existing OpenFlow networks employ packet-granularity mismatched packet buffer management to reduce the switch-controller communication overhead. However, the impact of packet buffer management granularity on network performance has not been well investigated yet. In this paper, we propose a novel design of flow-granularity mismatched packet buffer management model for OpenFlow networks, which outperforms the existing packet-granularity buffer management approaches with less communication overhead between switches and controllers. By designing the flow action pre-processing mechanism, we prevent per-flow packet disorder with less packet drop ratio. We evaluate the performance of the proposed flow-granularity mismatched packet buffer management scheme by building prototypes on both software and hardware switches. Experimental results reveal that our proposed method can effectively reduce the switches-controllers communication overhead, as well as preserve packet order for multi-flow OpenFlow networks.

7. Conclusions and future work

In this paper, we exploit the buffer resource in switches and propose FPB, a flow-granularity buffer for mismatched packet. FPB records the flow information of the first packet before sending Packet-in messages and buffers subsequent packets in flowgranularity. It guarantees the order of packets in the flow by releasing the buffer sequentially. As we expected, our experiment results show that switches with FPB dramatically reduce the number of switch-controller interactions, which mitigates the load of controller. FPB also decreases CPU utilization in the switch control plane. We believe that FPB can be regarded as a reference in the design of hardware or software OpenFlow switches to improve the scalable of OpenFlow networks. In the future work, we will estimate the impact of flow traffic and controller response time on the required total buffer size.