Research On Multi-Path Load Balancing Method Based On SDN

Load balancing is one of the key technology to ensure the quality of network services.By rationally scheduling network and computer resources,the purpose of avoiding network congestion and improving network performance is achieved.Traditional network architectures have problems such as lack of innovation,lack of programmability and cannot meet user needs.SDN(Software Defined Network)achieves separation of control and forwarding.How to use the centralized control and high flexibility of SDN to design a load balancing strategy suitable for a computer network based on SDN architecture is still a research hotspot.Aiming at the problem of load balancing scheme deployment under SDN architecture,the main contents are as follows:(1)Aiming at the deployment of LAN(Local Area Network)load balancing solution under SDN architecture,a SDN load balancing method based on K-Dijkstra algorithm is proposed.Firstly,the controller obtains the current network load condition and evaluates the current network load condition.Secondly,the K-Dijkstra algorithm is applied to select the most favorable links for the current network environment from the calculated K candidate links;Finally,the controller delivers the forwarding policy to migrate the current congestion traffic from the overloaded link to the link,that is most conducive to the current network environment and implements load balancing.(2)Aiming at the deployment of MAN(Metropolitan Area Network)load balancing solution under SDN architecture,a SDN load balancing method based on HRHP(Highest Response Highest Priority)algorithm is proposed.Firstly,the controller obtains the current network load condition and evaluates the current network load condition.Secondly,the HRHP algorithm is used to compare the time interval of the feedback message received by the controller and select the link that is most beneficial to the current network environment.Finally,the controller delivers the forwarding policy to the switch,thereby migrating the current congested traffic from the overloaded link to the link which is most beneficial to thecurrent network environment and achieving load balancing.(3)The simulation experiments are carried out on the two aspects of the work mentioned above.The experimental results show,the K-dijkstra algorithm and HRHP algorithm are used to load balanced deployment of LAN and MAN under SDN architecture,and the load rate,network delay and packet loss rate are obviously reduced and the network performance is improved effectively.