ILP modelling and joint optimization of anycast and unicast traffic in survivable elastic optical networks

In this paper, an optimization problem in elastic optical networks (EONs) is considered. The problem concerns routing and spectrum allocation with joint optimization of anycast and unicast demands protected by dedicated optical paths. A new integer linear programming (ILP) problem formulation is presented, which aims at overcoming scalability problems of the ILP model considered so far. Therefore, the ILP formulations are discussed and compared according to the number of variables, constraints and processing time.