A Diverse Virtual Optical Network Mapping Strategy Based on Security Awareness in Elastic Optical Networks
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摘要:
针对虚拟环境下底层网络中光纤的概率性故障，传统的100%保护至少需要配置一条保护路径，造成资源冗余度高和虚拟网络请求接受率低的问题，该文提出一种基于安全性感知的差异化虚拟光网络的映射(SA-DVNM)策略，在链路发生故障时为差异化虚拟网络请求提供安全保证。在SA-DVNM策略中，设计了一个综合考虑物理节点对之间跳数和相邻带宽大小的节点权重式避免链路映射过长，并提出路径频谱资源使用均衡的链路映射机制，最小化瓶颈链路的数量。当单路径传输失败时，SA-DVNM策略设计允许路径分割的资源分配机制，为保障时延敏感业务的安全性，SA-DVNM策略在路由选择中设计了基于时延差优化的多路径路由频谱分配方法。仿真结果表明该文所提策略在概率故障环境中能够降低带宽阻塞率，提高频谱资源利用率和虚拟光网络接受率。
Abstract:Due to the probabilistic failure of the optical fiber of the underlying network in the virtual environment, traditional full protection configures one protection path at least which leads to high resource redundancy and low acceptance rate of the virtual network. In this paper, a Security Awareness-based Diverse Virtual Network Mapping (SA-DVNM) strategy is proposed to provide security guarantee in the event of failures. In SA-DVNM, the physical node weight formula is designed by considering the hops between nodes and the bandwidth of adjacent links, besides, a path-balanced link mapping mechanism is proposed to minimize the overloaded link. For improving the acceptability of virtual network, SA-DVNM strategy designs a resource allocation mechanism that allows path cut when a single path is unavailable for low security. Considering the difference of time delay to ensure the security of delay-sensitive services, a multipath routing spectrum allocation method based on delay difference is designed to optimize the routing and spectrum allocation for SA-DVNM strategy. The simulation results show that the proposed SA-DVNM strategy can improve the spectrum utilization and virtual optical network acceptance rate in the probabilistic fault environment, and reduce the bandwidth blocking probability.
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表 1 路由选择和频隙消耗
路由选择 频隙数 消耗频隙总数 情形1 P1, P2 ${F_{\rm P1}}$=2 6 ${F_{\rm P2}}$=4 情形2 P1, P3 ${F_{\rm P1}}$=2 6 ${F_{\rm P3}}$=4 情形3 P2, P3 ${F_{\rm P2}}$=4 8 ${F_{\rm P3}}$=4 
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