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Routing Protocols

  • Support for configuring multiple independent IGP instances of IS-IS (ACX Series, MX Series, and PTX Series)—Starting in Junos OS Release 21.1R1, you can configure and run multiple independent IGP instances of IS-IS simultaneously on a router.

    Note:

    Junos OS does not support configuring the same logical interface in multiple IGP instances of IS-IS.

    [See How to Configure Multiple Independent IGP Instances of IS-IS.]

  • Support for flexible algorithms in IS-IS for segment routing–traffic engineering (SR-TE) (ACX Series)—Starting in Junos OS Release 21.1R1, 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 the IGP metric and another flexible algorithm to compute a path based on the traffic engineering metric to divide the network into separate planes. This feature enables networks without a controller to configure traffic engineering and utilize the 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 a device to participate 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.]