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bfd-liveness-detection (LAG)


Hierarchy Level


Configure Bidirectional Forwarding Detection (BFD) timers and authentication for aggregated Ethernet interfaces.

For an aggregated ethernet interface, you cannot configure all three configuration options, bfd-liveness-detection, minimum-links, and sync-reset at the same time.


holddown-interval milliseconds

Specify a time limit, in milliseconds, indicating the time that a BFD session remains up before a state change notification is sent. If the BFD session goes down and then comes back up during the hold-down interval, the timer is restarted.

  • Range: 0 through 255,000

  • Default: 0

local-address bfd-local-address

Specify the loopback address or the AE interface address of the source of the BFD session.


Beginning with Release 16.1R2, Junos OS checks and validates the configured micro BFD local-address against the interface or loopback IP address before the configuration commit. Junos OS performs this check on both IPv4 and IPv6 micro BFD address configurations, and if they do not match, the commit fails. The configured micro-BFD local-address should match with the micro-BFD neighbour-address configured on the peer router.

minimum-interval milliseconds

Specify a minimum time interval after which the local routing device transmits a BFD packet and then expects to receive a reply from the BFD neighbor. Optionally, instead of using this statement, you can configure the minimum transmit and receive intervals separately using the transmit-interval minimum-interval statement.

  • Range: 1 through 255,000

minimum-receive-interval milliseconds

Specify the minimum time interval after which the routing device expects to receive a reply from the BFD neighbor.

  • Range: 1 through 255,000

multiplier number

Specify the number of BFD packets that were not received by the BFD neighbor before the originating interface is declared down.

  • Range: 1 through 255

neighbor bfd-neighbor-address

Specify the loopback address or the AE interface address of a remote destination to send BFD packets.


Disable the BFD adaptation. Include this statement if you do not want the BFD sessions to adapt to changing network conditions. We recommend that you do not disable BFD adaptation unless it is preferable not to have BFD adaptation enabled in your network.


Configure the BFD version to detect (BFD version 1) or autodetect (the BFD version).


The version option is not supported on the QFX Series. Starting in Junos OS Release 17.2R1, a warning will appear if you attempt to use this command.

  • Default: automatic

The remaining statements are explained separately. See CLI Explorer.

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 13.3.