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Source Packet Routing in Networking (SPRING) or Segment Routing

  • Multi-instance OSPF with SR (MX204, MX240, MX304, MX480, MX960, MX10003, MX10004, MX10008, MX10016, MX2008, MX2010, and MX2020)—Configure and run multiple independent interior gateway protocol (IGP) instances of OSPFv2 with segment routing (SR) on a router. You can create two or more OSPF instances and apply SR-MPLS on each instance. Multiple instances of OSPF can advertise different prefix-segment identifiers (prefix-SIDs). Other instances can use these SIDs for making routing decisions.

    Multi-instance OSPF combined with SR enhances network flexibility, scalability, and control over traffic engineering, especially in large and complex networks.

    Note:

    Junos OS does not support the configuration of the same logical interface in multiple IGP instances of OSPFv2.

    [See Multiple Independent IGP Instances of OSPFv2 Overview and Example: Configure Multiple Independent Instances of OSPFv2 with Segment Routing.]

  • NSR support for SRv6 IS-IS and SRv6 BGP (MX204, MX240, MX304, MX480, MX960, MX10003, MX10004, MX10008, MX10016, MX2008, MX2010, and MX2020)—We support IS-IS nonstop active routing (NSR) for dynamic micro adjacency segment identifiers (SIDs) and dynamic classic adjacency End-x SIDs. Junos OS allocates the same dynamic SID on both the active and backup Routing Engines after switch-over to ensure dynamically allocated SIDs on the primary RE are not repurposed. You can also use BGP NSR for dynamic DT SIDs. Note that Junos OS currently does not support NSR for classic dynamic End SIDs.

    [See How to Enable SRv6 Network Programming in IS-IS Networks.]