Dynamic Load Balancing Strategy Based on Link Preference in SDN

In order to solve the problems of link congestion and data packet loss caused by link load imbalance in Software-Defined Network (SDN), a dynamic load balancing strategy based on link preference (LBBLP) is proposed. The SDN controller dynamically detects the link status of the data plane to get the bandwidth utilization of each link, and then maps the link bandwidth utilization to the link preference. The traffic is scheduled based on link preference to realize the even distribution of the traffic among the link. To achieve dynamic routing control, the mapping relationship between link bandwidth utilization and link preference changes dynamically with network traffic and link bandwidth utilization. Experiments show that LBBLP can effectively improve the network load balancing effect and reduce the packet loss rate.