The SNC Nominal Route is the default or preferred route that is assigned to an LSP when it is created. The SNC Nominal Route is determined by the constraints that are specified by the user during the LSP creation process, such as cost, SRLG, color, bandwidth, protection, and regeneration. The user can modify the SNC Nominal Route in NFM-T by using the Constraint Wizard, which is a tool that allows the user to change the constraints for an existing LSP.The Constraint Wizard will then compute a new SNC Nominal Route based on the modified constraints and update the LSP accordingly34.Reference:

3: Nokia GMPLS-controlled Optical Networks Course | Nokia

4: Nokia Network Functions Manager for Transport User Guide | Nokia