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heartbeat-timeout (MX Series Virtual Chassis)


Hierarchy Level


Configure the maximum time period within which a Virtual Chassis member router must respond to a heartbeat packet sent by the other member router. When an adjacency disruption or split is detected in the Virtual Chassis configuration, each member router sends a single heartbeat packet to the other member router to determine whether that router is still operating and able to respond. If the other member router responds to the heartbeat packet within the configured or default timeout period, the heartbeat connection helps prevent the member routers from changing primary role roles, which can cause undesirable results.


Both member routers forming the heartbeat connection must be assigned the routing-engine role in the preprovisioned Virtual Chassis configuration. The routing-engine role makes the router eligible to function as either the primary router or backup router of the Virtual Chassis.


seconds—Number of seconds within which a Virtual Chassis member router must respond to a heartbeat packet.

  • Range: 1 through 60 seconds

  • Default: 2 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 14.1.