Design of the Fast ReRoute QoS Protection Scheme for Bandwidth and Probability of Packet Loss in Software-Defined WAN

The paper is devoted to designing of the Fast ReRoute QoS protection scheme for bandwidth and probability of packet loss in Software-Defined WAN. The solution represented by a nonlinear flow-based model of fast rerouting with the protection of such two network performance indicators as bandwidth and probability of packet loss is proposed. This model at the level of the flow conservation conditions takes into account the buffer limitedness of queues on the routers interfaces, which allowed controlling the probable overload of the link resource. The numerical example confirmed the adequacy of the offered model and the efficiency of the decisions made in relation to the fast rerouting of data traffic with the realization of the protection scheme for bandwidth and probability of packet loss.