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High Availability

  • Support for VRRP on IRB interfaces (PTX10003)—Starting in Junos OS Evolved Release 21.2R1, PTX10003 devices support VRRP on IRB interfaces. The PTX10003 does not support ISSU, proxy ARP, and MC-LAG with VRRP in this release.

    [See Understanding VRRP.]

  • NSR support for controller-initiated RSVP LSPs (PTX10003, PTX10004, PTX10008, and QFX5220)—Starting in Junos OS Evolved Release 21.2R1, 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 Computational Elements (PCEs) with the backup Routing Engine. It also synchronizes 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. You enable this feature when you configure NSR.

    [See PCEP Configuration.]

  • Segment routing–traffic engineering (SR-TE) NSR support (PTX10001-36MR, PTX10003, PTX10008)—Starting in Junos OS Evolved Release 21.2R1, we support NSR for SR-TE, enabling hitless traffic flow during Routing Engine switchover. Routes using next hops from SR-TE policies that don't support NSR may experience traffic loss on switchover. The SR-TE policies that don't support NSR are DCSPF and Path Computation Element (PCE).

    [See Segment Routing for Traffic Engineering.]

  • Warm standby mode for routing protocols process (rpd) on backup Routing Engine (PTX10003, PTX10004, PTX10008)—Starting in Junos OS Evolved Release 21.2R1, you can set the rpd mode to warm-standby by using the set routing-options warm-standby command. Warm standby mode enables the backup Routing Engine to remain synchronized with the primary Routing Engine, allowing for faster Routing Engine switchover during GRES.

    [See warm-standby.]

  • Per PFE-Restart (PTX10008)—Starting in Junos OS Evolved release 21.2R1 you can restart each PFE instance on the device.

    [See fpc.]

  • Non-Stop Routing (NSR) (PTX10004, PTX10008, PTX10001-36MR)—Starting in Junos OS Evolved release 21.2R1 support is added for NSR using the LDP and BGP protocols.

    [See Nonstop Active Routing Concepts.]

  • Routing Engine Switchover (PTX10004, PTX10008)—Starting in Junos OS Evolved release 21.2R1 you can configure Routing Engine switchover for failure scenario such as Disk Read Threshold Failover, Component Failover, and Disk Failure.

    [See Understanding Routing Engine Redundancy on Juniper Networks Routers.]