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High Availability

  • Support for VRRP (PTX1000, PTX10002, PTX10008, and PTX10016)—Starting in Junos OS Release 21.1R1, PTX1000, PTX10002, PTX10008, and PTX10016 routers support VRRP. However, these routers do not support the following VRRP features:

    • VRRP on IRB
    • Dual tagging
    • GRES
    • VRRP on logical tunnel (LT) interfaces
    • Layer 2 VRRP

    [See Understanding VRRP.]

  • Support for VRRP on EX9200-SF3 and EX9200-15C (EX9200)—Starting in Junos OS Release 21.1R1, the EX9200-SF3 Switch Fabric module and the EX9200-15C line card support VRRP. All VRRP features are supported.

    [See Understanding VRRP.]

  • Distributed mode support for fast BFD failure detection (SRX1500, SRX4100, SRX4200, and SRX4600)—Starting in Junos OS Release 21.1R1, we support distributed mode for BFD. This mode provides a faster BFD failure detection time of 3 x 300 ms. You enable distributed mode by configuring the BFD failure detection time to a value less than 500 ms. We support this feature for a standalone SRX Series device. It is not supported for chassis clusters.


    SRX1500 devices run in dedicated mode if you've configured set chassis dedicated-ukern-cpu, regardless of the BFD failure detection time. You can enable distributed mode on SRX1500 devices only when dedicated mode is not enabled.

    [See detection-time (BFD Liveness Detection) and Understanding Distributed BFD.]