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Source Packet Routing in Networking (SPRING) or Segment Routing

  • Support for RFC 8814  (ACX Series and PTX Series)—Starting in Junos OS Evolved Release 23.4R1, we partially support RFC 8814, Signaling Maximum SID Depth (MSD) Using the Border Gateway Protocol-Link State. Currently, we support signaling the MSD using IS-IS for SRv6. For non-segment routing networks, the MSD value reflects the maximum label depth.

    A controller in a segment routing network learns the MSD of the participating router and computes the segment routing path. The controller ensures that the label stack is not greater than what the routers can support.

    [See Link-State Distribution Using BGP.]

  • SRv6 dynamic SID support for BGP and IS-IS protocols (ACX Series)—Starting in Junos OS Evolved Release 23.4R1, we support dynamic segment IDs for BGP and IS-IS.

    To enable dynamic end SID, include the dynamic-end-sid configuration statement at the [edit protocols isis source-packet-routing srv6 locator locator-name] hierarchy level.

    To enable dynamic end x SID, include the dynamic-end-x-sid configuration statement at the [edit protocols isis interfaceint-name level level-number srv6-adjacency-segment protected locator locator-name] hierarchy level.

    [See.level and srv6.]

  • Dynamic tunnel support for SRv6 tunnels (ACX7100-32C, ACX7100-48L, ACX7348, ACX7509, and ACX7024, and ACX7024X)—Starting in Junos OS Evolved Release 23.4R1, you can configure sgment routing for IPv6 (SRv6) Layer 3 VPN dynamic tunnel over a traditional Layer 3 VPN network.

    The following functionalities are supported:

    • DT4, DT6, DT46, uDT4, uDT6, uDT46 SIDs.

    • Signal SRv6 locator based dynamic tunnel from BGP.

    • Resolve BGP route over dynamic tunnel route.

    • Resolve BGP route over dynamic tunnel and create transport tunnel composite next hop (TCNH) with BGP/IGP/Static as underlay. Have single or multiple router next hops.

    • Forwarding policies under dynamic tunnels.

    • DSCP propagation for dynamic tunnel at ingress.

    • Display dynamic tunnel (dyn-tunnel) flag information for SRv6 tunnel as part of show route extensive command.