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no-adaptation (BFD Liveness Detection)

 

Syntax

Hierarchy Level

Release Information

Statement introduced in Junos OS Release 9.0

Support for BFD authentication introduced in Junos OS Release 9.6.

Description

Configure BFD sessions not to adapt to changing network conditions. We recommend that you do not disable BFD adaptation unless it is preferable to have BFD adaptation disabled in your network.

The BFD failure detection timers are adaptive and can be adjusted to be faster or slower. The lower the BFD failure detection timer value, the faster the failure detection and vice versa. For example, the timers can adapt to a higher value if the adjacency fails (that is, the timer detects failures more slowly). Or a neighbor can negotiate a higher value for a timer than the configured value. The timers adapt to a higher value when a BFD session flap occurs more than three times in a span of 15 seconds. A back-off algorithm increases the receive (Rx) interval by two if the local BFD instance is the reason for the session flap. The transmission (Tx) interval is increased by two if the remote BFD instance is the reason for the session flap. However, include the no-adaptation statement in the configuration if you do not want BFD sessions to adapt to changing network conditions.

You can use the clear bfd adaptation command to return BFD interval timers to their configured values. The clear bfd adaptation command does not affect traffic flow on the routing device.

Required Privilege Level

routing—To view this statement in the configuration.

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