Improving QoS in SDN with lossless multi-domain reconfigurations

In this poster, we propose a novel approach of multidomain reconfigurations in SDN, termed as Lossless Reconfiguration (LR), to avoid packet loss and maintain the availability of services during the reconfiguration process. By leveraging the advantages of SDN, e.g., centralized control in one domain and feasible cooperation between the controllers of different domains, LR offers a better solution to the transient problem. First, we identify three categories of domains in the reconfiguration process. We then develop four steps to reconfigure the different categories of domains in order. By the synchronization of the involved controllers in each reconfiguration step, the transient problem can be resolved without any device modification requirement.