网络虚拟化是通过抽象、分配、隔离机制,在一个公共物理网络上独立运营多个虚拟网络,从而能够有选择性地进行资源分配与调度,提高物理网络资源利用率与服务质量,并降低网络运营和维护成本。本文对云计算环境下数字图书馆网络虚拟化的应用现状、趋势等问题进行探讨,然后研究了如何提升虚拟化网络的服务质量、安全性、可管理性。 Network virtualization is through the abstraction, allocation and isolation mechanisms to operate multiple virtual networks independently on a common physical network, thereby enabling selective resource allocation and scheduling, improving utilization of physical network resources and service quality, and reducing network overhead Operating and maintenance costs. In this paper, we discuss the application status and trends of digital library network virtualization in cloud computing environment, and then study how to improve the service quality, security and manageability of virtualized network.