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Routing Protocols

  • IS-IS link delay measurement and advertising (MX Series)—Starting in Junos OS Release 21.1R1, you can measure and advertise various performance metrics in IP networks with scalability, by using several IS-IS probe messages. These metrics can then be used to make path-selection decisions based on network performance.

    [See How to Enable Link Delay Measurement and Advertising in IS-IS, delay-measurement, and delay-metric.]

  • Support for configuring multiple independent IGP instances of IS-IS (ACX Series, MX Series, and PTX Series)—Starting in Junos OS Release 21.1R1, you can configure and run multiple independent IGP instances of IS-IS simultaneously on a router.


    Junos OS does not support configuring the same logical interface in multiple IGP instances of IS-IS.

    [See How to Configure Multiple Independent IGP Instances of IS-IS.]

  • Support for BGP Auto-discovered Neighbor (MX Series, PTX1000, PTX10008, QFX5120-32C, QFX5200, QFX5210, and QFX10008)—Starting in Junos OS Release 21.1R1, we support BGP auto-discovered neighbors using IPv6 Neighbor Discovery Protocol (ND). With this feature, you can enable BGP to create peer neighbor sessions using link-local IPv6 addresses of directly connected neighbor devices. You need not specify remote or local neighbor IP addresses.

    To enable peering for a given interface or set of interfaces without specifying the local or remote neighbor addresses, configure the peer-auto-discovery statement at the [edit fabric protocols bgp group <name> dynamic-neighbor <name>] hierarchy level.

    [ See BGP Auto-Discovered Neighbors, and peer-auto-discovery.]