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High Availability

  • Hardware-assisted inline BFD (QFX5120-32C and QFX5120-48Y)—Starting in Junos OS Release 21.2R1, we support a hardware implementation of the inline BFD protocol in firmware form. The ASIC firmware handles most of the BFD protocol processing. The firmware uses existing paths to forward any BFD events that must be processed by protocol processes. The ASIC firmware processes the packets more quickly than the software, so hardware-assisted inline BFD sessions can have keepalive intervals of less than a second. These platforms support this feature for single-hop and multihop IPv4 and IPv6 BFD sessions.

    Limitations:

    • If the Packet Forwarding Engine process restarts or the system reboots, the BFD sessions will go down.

    • When using hardware-assisted BFD with ECMP, if hardware recovery takes more time than the BFD timer, it can cause flapping in the BFD session.

    Hardware-assisted inline BFD:

    • Does not support micro BFD.
    • Is only supported on standalone devices.
    • Does not support BFD authentication.
    • Does not support IPv6 link local BFD sessions.
    • Cannot be used with VXLAN encapsulation of BFD packets.
    • Cannot be used with LAG.
    • Cannot be used with ECMP on QFX5120 Series devices.

    [See ppm and Bidirectional Forwarding Detection (BFD).]