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The work proposes developing a bilinear Quality of Service routing model over disjoint paths with bandwidth guarantees in the Software-Defined Network data plane. The advantage of the solution is formulating the routing problem as optimization under bilinear conditions aimed at bandwidth guarantee over the set of disjoint paths (multipath). Solving the routing problem allows obtaining disjoint routes by Boolean variables calculation responsible for the link belonging to the collection of network paths. Also, the model introduces conditions of the disjoint routes connectivity and the intersection absence. The model's novelty is the bilinear conditions for a given Quality of Service level guarantee. Fulfilling such bilinear requirements provides that the total bandwidth of the disjoint routing multipath will not be lower than the demanded level. Also, the optimality criterion is defined by the Quality of Service requirements. A …