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detection-time (BFD for BGP)

Syntax

detection-time {threshold milliseconds;}

Hierarchy Level

[edit logical-systems logical-system-name protocols bgp bfd-liveness-detection],[edit logical-systems logical-system-name protocols bgp group group-name bfd-liveness-detection],[edit logical-systems logical-system-name protocols bgp group group-name neighbor address bfd-liveness-detection],[edit logical-systems logical-system-name routing-instances routing-instance-name protocols bgp bfd-liveness-detection],[edit logical-systems logical-system-name routing-instances routing-instance-name protocols bgp group group-name bfd-liveness-detection],[edit logical-systems logical-system-name routing-instances routing-instance-name protocols bgp group group-name neighbor address bfd-liveness-detection],[edit protocols bgp bfd-liveness-detection],[edit protocols bgp group group-name bfd-liveness-detection],[edit protocols bgp group group-name neighbor address bgp bfd-liveness-detection],[edit routing-instances routing-instance-name protocols bgp bfd-liveness-detection],[edit routing-instances routing-instance-name protocols bgp group group-name bfd-liveness-detection],[edit routing-instances routing-instance-name protocols bgp group group-name neighbor address bfd-liveness-detection]

Release Information

Statement introduced in Junos OS Release 8.2.

Statement introduced in Junos OS Release 9.0 for EX Series switches.

Support for BFD authentication introduced in Junos OS Release 9.6.

Statement introduced in Junos OS Release 12.1 for the QFX Series.

Description

Enable BFD failure detection. 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. You can use the clear bfd adaptation command to return BFD interval timers to their configured values. The clear bfd adaptation command is hitless, meaning that the command does not affect traffic flow on the routing device.

The remaining statement is explained separately.

Required Privilege Level

routing—To view this statement in the configuration.

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

 

Related Documentation

 

Published: 2013-08-15

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