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Source Packet Routing in Networking (SPRING) or Segment Routing

  • Avoid microloops in OSPFv2 segment routing networks (PTX10001-36MR, PTX10004, and PTX10008) —Starting in Junos OS Evolved Release 22.1R1, you can enable post-convergence path calculation on a device to avoid microloops if a link or metric changes in an OSPFv2 segment routing network. Note that microloop avoidance is not a replacement for local repair mechanisms such as topology-independent loop-free alternate (TI-LFA), which detects local failure very fast and activates a precomputed loop-free alternative path.

    To configure microloop avoidance in an OSPFv2 segment routing network, include the maximum-labels and delay milliseconds statements at the [edit protocols ospf spf-options microloop avoidance post-convergence-path] hierarchy level.

    [See How to Configure Microloop Avoidance for OSPFv2 SR Networks.]

  • Support for FEC 128 and FEC 129 VPLS with source packet routing (ACX7100-32C, ACX7100-48L, and ACX7509)—Starting in Junos OS Evolve Release 22.1R1, Junos OS supports forwarding equivalence class (FEC) 128 and FEC 129 VPLS with Source Packet Routing in Networking (SPRING) with IS-IS, OSPF, and non-colored segment routing–traffic-engineering (SR-TE). Source packet routing or segment routing is applied in an MPLS network. You can use FEC 128 and FEC 129 VPLS with SPRING over MPLS as an alternative to LDP VPLS over MPLS.

    [See Understanding Source Packet Routing in Networking (SPRING) ,Example: Configuring a Multihomed VPLS (FEC 128), and Example: Configuring VPLS Multihoming (FEC 129) .]