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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.]