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Interfaces

  • Support for IS-IS BFD-enabled sub-TLV (MX2010, MX2020, PTX10000, PTX10008, and PTX10016)—Starting in Junos OS Release 22.3R1, the strict BFD feature allows IS-IS to converge only when BFD is up, and it sends the UP notification to IS-IS. We've introduced a new state in the IS-IS adjacency state machine (InitStrictBFD state) to indicate the agreement between routers to support strict BFD. We've also added a new BFD IS-IS Hello (IIH) PDU TLV in IS-IS hello packets.

    If BFD is unstable, to prevent the traffic from being compromised until the IS-IS adjacency timer expires, configure the hold-down interval (in milliseconds). This configuration delays sending the UP notification to the BFD client. After the BFD is up, the hold-down interval starts, and upon expiration, a BFD UP notification is sent to IS-IS so that IS-IS can start forming an adjacency.

    We've added the following statements for this feature:

    • strict-bfd at the [edit protocols isis interface name level level ] hierarchy level.

    • holddown-interval at the [edit protocols isis interface interface family inet bfd-liveness-detection] hierarchy level.

    [See Configuring BFD, interface (Protocols IS-IS), and bfd-liveness-detection (Protocols IS-IS).]