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Hierarchy Level


Configure the method used by the LAC or the LNS to resynchronize with its peer in the event of a control plane failover. Failure can be the result of a Routing Engine switchover, a daemon restart, or some other cause. During tunnel setup, the L2TP endpoints negotiate the resynchronization method; silent failover is the default.

With the silent failover method, only the failed endpoint is involved in recovering the tunnels and sessions; the nonfailed endpoint remains unaware of the failure.

With the failover protocol method, the nonfailed endpoint keeps the tunnel open with the failed peer, in case the failed peer is able to recover from the failure and resynchronize with the nonfailed peer. The detection of tunnel keepalive failures is delayed. This behavior keeps the tunnel up and the subscribers logged in while traffic is not flowing, preventing service level agreements from being met.

Best Practice:

Use the default method, silent failover.

This statement supersedes the deprecated statement, disable-failover-protocol.



Specify the L2TP failover protocol as the resynchronization method, but fall back to silent failover if the other endpoint does not support it.


Specify silent failover as the resynchronization method.

  • Default: silent-failover

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 17.2R1.