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Source Packet Routing in Networking (SPRING) or Segment Routing

  • Avoid microloops in IS-IS segment routing MPLS networks (PTX Series) —Starting in Junos OS Evolved Release 21.3R1, you can enable post-convergence path calculation on a device to avoid microloops between network devices. Microloops form when a network change such as a link or metric change occurs in a segment routing MPLS network. A network change might trigger a loop between upstream and downstream routers for a brief time period because the routers do not update their forwarding state simultaneously.

    To configure microloop avoidance in a segment routing MPLS network, include the maximum-labels and the maximum-srv6-sids statements at the [edit protocols isis spf-options microlooop-avoidance post-convergence-path]hierarchy level.

    {See Understanding Microloop Avoidance}