Flexible Algorithm with IS-IS

This feature introduces thin network topology slicing by defining flexible algorithms for IS-IS that compute paths using different parameters and link constraints based on the requirements. For example, you can define a flexible algorithm that computes a path to minimize the IGP metric and define another flexible algorithm to compute a path based on the traffic engineering metric to divide the network into separate planes. This feature allows networks without a controller to configure traffic engineering using segment routing without actually implementing a network controller. You can use the prefix SIDs to steer packets along the constraint-based paths. You can configure the prefix SIDs for the flexible algorithm through policy configurations.