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Routing Protocols

  • Support for flexible algorithm in IS-IS for segment routing–traffic engineering (ACX Series)—Starting in Junos OS Release 21.2R1, you can thin slice a network by defining flexible algorithms that compute paths using different parameters and link constraints based on your requirements. For example, you can define a flexible algorithm that computes a path to minimize IGP metric and define another flexible algorithm to compute a path based on traffic-engineering metric to divide the network into separate planes. This feature allows networks without a controller to configure traffic engineering and utilize segment routing capability of a device.

    To define a flexible algorithm, include the flex-algorithm statement at the [edit routing-options] hierarchy level.

    To configure participation in a flexible algorithm include the flex-algorithm statement at the [edit protocols isis segment routing] hierarchy level.

    [See Understanding IS-IS Flexible Algorithm for Segment Routing.]

  • Flexible algorithm inter-level leaking support for SRv6 and SR-MPLS in ISIS (ACX Series, MX Series and PTX Series)—Starting in Junos OS Release 21.2R1, we support flexible algorithm inter-level leaking for SRv6 and SR-MPLS in IS-IS. Also, we partially support TE-App RFC 8919 in its basic form and extends 6PE support for flexible algorithm.