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disable-failover-protocol (L2TP)

Syntax

Hierarchy Level

Description

Configure the LAC or LNS to use only the silent failover method when resynchronizing with its peer in the event of a control plane failover. This statement prevents the default behavior, where the LAC first attempts to negotiate the failover protocol when it establishes control connections with the peer. If the remote peer does not support the failover protocol, then the LAC falls back on the silent failover method. Including this configuration is useful when the peers configured for silent failover or incorrectly negotiate use of the failover protocol even though they do not support it.

Best Practice:

We recommend that you include this statement on both the LAC and LNS to prevent the use of failover protocol. When failover protocol is used, the nonfailed peer (LAC or LNS) 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. This behavior keeps the tunnel up and the subscribers logged in while traffic is not flowing, preventing service level agreements from being met.

Starting in Junos OS Releases 15.1R6, 16.1R5, 16.2R2, 17.1R2, and 17.2R1, the disable-failover-protocol statement is deprecated and no longer needs to be used. The default failover resynchronization method is changed to silent failover, rather than the previous default method of failover-protocol-fall-back-to-silent-failover. The new default method conforms to our recommendation to use silent failover. Consequently, there is no need to disable the failover protocol. Configurations that include this statement are still supported when you upgrade to a release in which it is deprecated; The CLI informs you of the deprecation if the statement is included.

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 11.2.

Statement deprecated in Junos OS Release 15.1R6, 16.1R5, 16.2R2, 17.1R2, and 17.2R1.

Related Documentation

Change History Table

Feature support is determined by the platform and release you are using. Use Feature Explorer to determine if a feature is supported on your platform.

Release
Description
15.1R6
Starting in Junos OS Releases 15.1R6, 16.1R5, 16.2R2, 17.1R2, and 17.2R1, the disable-failover-protocol statement is deprecated and no longer needs to be used.