A device receives network data associated with a network that includes network devices interconnected by links at an Internet protocol (IP) layer and an optical layer of the network. The device receives constraints associated with determining a network plan for the network, where the constraints include a constraint indicating a particular time period associated with determining potential network plans for the network. The device identifies variables and values of the variables for the network plan based on the network data, and determines, within the particular time period, the potential network plans for the network based on the constraints and the values of the variables. The device identifies a potential network plan, of the potential network plans, that minimizes costs associated with operating the network, and causes the identified potential network plan to be implemented in the network by the network devices.