The Reseach And Implementation Of Load Balancing Technology On SDN

With the rapid development of the Internet, network traffic is increasing, the data center is facing increasing traffic pressure As the traditional network architecture can not control the overall network equipment, it is likely to cause node load uneven, resulting in decreased network service quality. Software Define Network (SDN) separates the forwarding layer and the control layer, and uses the control layer of the traditional network device, and use the control layer to realize the centralized management of the network.The SDN architecture provides a good idea for load balancing in the data center. Aiming at the problem of uneven load of network nodes in the data center, it is proposed to balance the traffic through the single link index evaluation path. In order to evaluate the path better, this paper comprehensively evaluates the multiple indexes of the path, and proposes a minimum cost load balancing algorithm (LCLB, Least Cost Load Balancing) based on link multi-index. This algorithm reduces the jitter rate of the load in the link and achieves the load balancing effect?In this paper, we design and implement the link discovery module,topology management module, topology calculation module, information statistics module, load balancing module and flow table module, and on this basis, we study and design the strategy LCLB algorithm based on SDN. Through the topology calculation module, all the paths between the hosts are obtained, and the link state is monitored in real time by the statistical module. In the load balancing module, the link index value in the whole path is taken into account and the minimum cost value is obtained according to the link state. Avoid congestion due to a single link.The experimental results show that the proposed algorithm can reduce the link load jitter rate and packet loss rate, and can effectively alleviate network congestion and have good load balancing effect.