| SDN is a programmable network structure which achieves separation of control and forwarding via a centralized controller. Existing cloud data cen-ter network introduces SDN architecture, and enhances data center scalability via advantages of programmable thinking and centralized control. OpenStack is a free and open-source software platform for cloud computing, which pro-vides computing, storage and network management services for cloud comput-ing resources. However, with rapid development of various types of services,the current SDN data center based on OpenStack can't satisfy multiple users'service requirements. Cloud data center network with single control node can-not achieve tenants' customization of their own network. At the same time,OpenStack cloud platform can't achieve centralized control for SDN network between physical servers.Based on this, a SDN-based cloud platform multi-tenant virtual network customization mechanism is presented in this paper. Firstly, achieve centralized control for SDN network between physical servers. Through the coordination of communication with OpenStack, the unified management between cloud data center network and compute resources in OpenStack are realized. On this basis,by giving each tenant access to a virtualized network topology and a full net-work header space, realize the tenant cloud data center network virtualization.The virtual SDN network is controlled by tenant's own controller. Tenants can use their own controller for customized operation.On the basis of the virtual SDN network, a controller image is provided for tenant in this paper. This paper develops north applications for this controller,and realizes the measurement of link bandwidth and delay. According to the current link load, tenant can choose the data transmission link through sending the customized flow table. So as to speed up the data transmission efficiency and improve the bandwidth utilization.Experiments show that tenants can achieve the customized operation in data center network, in the premise of not reducing the performance of the cur-rent cloud platform. Realize the centralized control of their own data center network. |
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