电子政务云属于大规模私有云，其整体架构可采用软件定义数据中心（SDDC）架构。围绕软件定义网络的问 题，本文介绍了电子政务云的主要特征以及对于网络提出的挑战，提出基于VxLAN和SDN的网络解决思路；针对电子政务云 的特点，提出了网络Overlay 的具体组网方案，并对其优点进行了总结；最后，本文提出了SDN控制器与异构云管理平台的对 接方案，并以Openstack为例，描述了SDN控制器与云管理平台的配置流程。

E-government cloud is a kind of big scale private cloud data center. It takes the SDDC as the architecture. For the software defined network, this paper firstly introduces the main characters of the e-government cloud and the challenges of the network, and then offers a solution based on VxLAN and SDN. It also gives a network overlay solution for the e-government cloud, and summarizes its advantages. It provides a scheme to connect the SDN controller to the heterogeneous cloud management platform. At last, taking Openstack as an example, the configuration process of SDN controller and cloud management platform are described.