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虚拟网络是一种依赖Internet基础设施所提供的传输能力,但又具有独立拓扑结构和信息传递规则的应用层网络行为逻辑网络.提出了耦合虚拟网络行为与物理节点的抽象模型,对一类典型的虚拟网络逻辑拓扑给互联网整体特性带来的影响进行了分析.研究表明在虚拟网络作用下,节点数据包排队长度存在相变特性,但相变临界点比对规则网络发生了明显左移,网络性能相对恶化.当数据包注入速率小于相变临界速率时,节点数据包排队长度不相关或短程相关;在接近临界速率处,节点数据包排队长度长程相关,幂指数H增大,网络获得更强的长程相关性.同时,在注入速率大于或等于临界速率时,虚拟网络行为使网络呈现出一致的长程相关特性.
Virtual network is an application layer network behavior logic network that relies on the transport capabilities provided by the Internet infrastructure but has independent topology and information delivery rules.An abstract model for coupling virtual network behavior and physical nodes is proposed, The influence of the virtual network logical topology on the overall Internet characteristics is analyzed.The research shows that the queue length of the node data packets has the phase transition characteristics under the action of the virtual network but the transition point has a significant shift to the regular network, When the packet injection rate is less than the critical phase transition rate, the queue length of the node data packets is not correlated or short-range dependent. At the critical speed, the node packet queuing length is long-range dependent, the power index H is increased, and the network gain Stronger long-range correlation.At the same time, when the injection rate is greater than or equal to the critical rate, the virtual network behavior makes the network show a consistent long-range related characteristics.