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Source Packet Routing in Networking (SPRING) or Segment Routing

  • SRv6 flexible algorithms in TED and BGP-LS (MX10008)—Starting in Junos OS Release 22.3R1, we support Segment Routing for IPv6 (SRv6) flexible algorithms in traffic engineering database (TED) and BGP Link State (LS). Flexible algorithms enable routing protocols such as IS-IS and OSPF to compute paths over a network based on user-defined parameters such as calculation type, metrics, and constraints. You cannot define flexible algorithms specifically for either SR-MPLS or SRv6. If a node is participating in a flexible algorithm it would apply to both SR-MPLS and SRv6 nodes.

    [See How to Configure Flexible Algorithms in IS-IS for Segment Routing Traffic Engineering and BGP Link-State Extensions for Source Packet Routing in Networking (SPRING).]

  • BGP service route resolution over SRv6 SIDs (MX10008)—Starting in Junos OS Release 22.3R1, we support the resolution of IPv6 routes over Segment Routing for IPv6 (SRv6) segment identifiers (SIDs) for the following prefixes:

    • Prefixes associated with the BGP extended community color attribute. You can configure the BGP transport class for resolution of IPv6 routes over the flexible algorithm locator. Note that BGP prefers the PNH or the SRv6 segment routing–traffic engineering (SR-TE) policy over the SRv6 flexible algorithm.

    • Prefixes that are not associated with the BGP extended community color attribute.

    [See BGP Classful Transport (BGP-CT) with Underlying Colored SR-TE Tunnels Overview.]