Algorithms for Assigning Substrate Network Resources to Virtual Network Components

Authors:
  • YZY. Zhu
    Y. Zhu
  • MAM. Ammar
    M. Ammar
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Abstract
Recent proposals for network virtualization provide a promising way to overcome the Internet ossification. The key idea of network virtualization is to build a diversified Internet to support a variety of network services and architectures through a shared substrate. A major challenge in network virtualization is the assigning of substrate resources to virtual networks (VN) efficiently and on-demand. This paper focuses on two versions of the VN assignment problem: VN assignment without reconfigu- ration (VNA-I) and VN assignment with reconfiguration ( VNA- II). For the VNA-I problem, we develop a basic scheme as a building block for all other advanced algorithms. Subdividing heuristics and adaptive optimization strategies are then presented to further improve the performance. For the VNA-II problem, we develop a selective VN reconfiguration scheme that prioritizes the reconfiguration of the most critical VNs. Extensive simulation ex- periments demonstrate that the proposed algorithms can achieve good performance under a wide range of network conditions.