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详细说明： 很好的文章，Software-defined networking has emerged as a powerful approach to improve the customizability and flexibility of networks. In this work, we focus on virtualization in the realm of software-defined network- ing, and study how to embed virtual networks in this environment. Virtual network embedding is an important problem because intelligent embedding can lead to better performance and a more efficient allocation of network resources compared to random mapping. In software-defined networking, the pres- ence of a central cont roller is a complicating factor, and customizable routing and differences in resource sharing present new opportunities and challenges. We identify two aspects of virtual network embedding in software-defined networks: virtual node and link mapping, and controller placement. We tackle these problems together, developing techniques to perform embedding with two goals: balancing the load on the substrate network and minimizing controller-to-switch delays. We evaluate our techniques with sim- ulation and Mininet emulation, and show that they are able to optimize for one of the above objectives while keeping the other within reasonable bounds ...展开收缩
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