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bfd-liveness-detection (LAG)



Hierarchy Level

Release Information

Statement introduced in Junos OS Release 13.3.


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


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.

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.
no-adaptation 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.
version Configure the BFD version to detect (BFD version 1) or autodetect (the BFD version).

The version option is not supported on the QFX Series.

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.