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High Availability

  • 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.]