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Hierarchy Level


Configure the flex-algorithm definition (FAD) and specify the parameters of the definition. IS-IS calculates the path based on these specified parameters of the FAD. We recommend configuring flexible algorithm on only a couple of routers to provide redundancy and to avoid conflicts.



Normal SPF of type 0


Strict SPF


Specify the metric type that you would like to use in your network.

  • Values:

    • delay-metric— Specify this option to enable minimum unidirectional link delay metric (minimum latency).

    • igp-metric— Specify this option to use the IGP route metric instead of the traffic engineering metric.

    • te-metric— Specify this option to use the configured traffic engineering metric instead of the IGP metric if you have enabled traffic engineering on the device.


Specify a priority to the flexible algorithm advertisement. IS-IS prioritizes a particular FAD advertisement over another FAD based on your assigned priority.

  • Range: 0 through 255

The remaining statements are explained separately. See CLI Explorer.

Required Privilege Level


Release Information

Statement introduced in Junos OS Release 19.4R1.