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  • Nonstop active routing (NSR) support for controller-initiated RSVP label-switched paths (LSPs) (MX Series, PTX Series, and QFX Series)—Starting in Junos OS Release 21.1R1, we support NSR for controller-initiated RSVP-based point-to-point (P2P) and point-to-multipoint (P2MP) LSPs. The primary Routing Engine synchronizes all RSVP LSPs initiated by Path Computation Elements (PCEs), including multicast flow specifications for any PCE-initiated P2MP LSPs, with the backup Routing Engine. This ensures zero traffic loss for the traffic carried over PCE-initiated RSVP LSPs during Routing Engine switchovers. This feature is enabled when NSR is configured.

    [See PCEP Configuration.]

  • BGP Classful Transport planes (BGP-CT) to facilitate service mapping over colored tunnels (ACX Series, PTX Series, MX Series)—Starting in Junos OS Release 21.1R1, you can classify colored transport tunnels (RSVP, IS-IS flexible algorithm) in your network into transport classes and map service routes over an intended transport class. You can also extend the transport tunnels to span across multiple domains (ASs or IGP areas) by using the new BGP transport address family called BGP Classful Transport (BGP CT).

    This feature lays the foundation for network slicing and allows the different domains to interoperate irrespective of the transport signaling protocols used in each domain.

    [See BGP Classful Transport Planes Overview.]

  • Install prefixes for RSVP-TE LSPs using PCEP (MX Series, PTX Series, QFX Series)–Starting in Junos OS Release 21.1R1, you can configure different prefixes for Path Computation Element (PCE)-initiated and PCE-delegated RSVP-TE LSPs using the Path Computation Element Protocol (PCEP). Prior to this feature, for PCE-initiated LSPs, you could install prefixes as routes through templates and map the templates to the LSPs. For Path Computation Client (PCC)-configured LSPs, although you could install prefixes on the device, this information was not reported to the PCE.

    With this feature, you can install prefixes for external RSVP-TE LSPs through PCEP communication, and enable the PCC to report installed prefixes for all local RSVP-TE LSPs to the PCE . This support provides you better traffic engineering capabilities and allows Junos OS to interoperate with other vendor's PCC or PCE.

    [See PCEP Overview.]