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Hierarchy Level


For routing platforms with two Routing Engines, a primary Routing Engine is configured to switch over gracefully to a backup Routing Engine. This allows the routing protocol information to be preserved even after failover. Support of precision-timers in the kernel is a feature where the kernel takes over autogeneration of BGP keepalives right after the switchover from backup to primary event occurs. The kernel in the Routing Engine continues this autogeneration until RPD is able to take over the session or until a maximum period has elapsed since the switchover event occurred.


This maximum period configuration applies only when at least one client protocol such as BGP registers for the automatic keepalive generation service provided by the kernel, and the kernel timer generates control plane session keepalives on behalf of that protocol after a switchover event.


precision-timers-max-period precision-timers-max-period

The maximum period for which the kernel auto generates keepalives on behalf of BGP after a switchover event from backup to primary.


You can verify the precision-timers-max-period using show nonstop-routing command.

  • Default: 600 seconds

  • Range: 60 seconds to 1800 seconds

Required Privilege Level

routing—To view this statement in the configuration.

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

Release Information

Statement introduced in Junos OS Release 15.2.