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failover (Chassis)


Hierarchy Level


Specify conditions on the primary Routing Engine that cause the backup router to take primary role.

On Junos OS devices this statement enables automatic Routine Engine switchover. By default this statement is disabled on Junos OS Evolved, but it may be enabled if you are upgrading an existing configuration from Junos OS to Junos OS Evolved. To disable automatic failover on Junos OS Evolved devices, delete this statement by entering the delete chassis redundancy failover command.

The remaining statements are explained separately. See CLI Explorer.


on-disk-failure—Instruct the backup router to take primary role if it detects hard disk errors on the primary Routing Engine.

on-loss-of-keepalives—Instruct the backup router to take primary role if it detects a loss of keepalive signal from the primary Routing Engine.

on-re-to-fpc-stale—Instruct the backup router to take mastership if the em0 interface fails on the master Routing Engine.

Required Privilege Level

interface—To view this statement in the configuration.

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

Release Information

Statement introduced before Junos OS Release 7.4.

on-re-to-fpc-stale option introduced in Junos OS Release 15.2 on the MX240, MX480, MX960, MX2010, and MX2020.

on-re-to-fpc-stale option added in Junos OS Release 22.2R1 on the MX10008, MX10016, PTX10008, PTX10016, QFX10008, and QFX10016.