The Active Synchronization And Stability Analysis Of Software Defined Data Center Network

As the core framework of cloud computing,Data Center Network is apace development and it has attracted wide attention from industry and academia.The requirements for scalability and stability performance of Data Center Network is strictly.Software Defined Network(SDN)technology is increasingly applied to the Data Center Network management and construction to meet the scalability requirement.Due to the limited performance of the controller,Data Center Network controlled by single controller can not meet the requirement of the scalability with the rapid development of cloud computing network.To satisfy the scalability and stability requirements,the Multi-domain multi-controller Data Center Network increases the number of controllers to improve the control of the whole network.However,the consistent among controllers is required to avoid the collapse of the network,that is because the controller is responsible for the local domain.The existing synchronization algorithm is a time-based synchronization algorithm,which ignores the potential inconsistency among controllers.Packet losing and poor load balancing performance happen under this algorithm.An Active Synchronization algorithm based on load is proposed in this paper.Because the Active Synchronization algorithm is based on event but not time,so it eliminates the association between synchronization and time,and it avoids the presence of forwarding loops throughout the network Simulation results show that the Active Synchronization algorithm has better performance compared to existing PS-based schemes.On the other hand,the Active Synchronous algorithm uses less synchronizing overhead than PS-based schemes under similar load balancing performances.This paper establishes the Data Center Network as a five-element discrete event system whose link load is state and the variation of the load is event.It is found that the system can satisfy the conditional stability of Lyapunov,and Data Center Network is proved that it meets the Lyapunov asymptotically stability under the load balancing strategy in Data Center Network.