interfaces <interface> vrrp vrrp-group <group-id> preempt <preempt>
Enables or disables preemption for a VRRP group on an interface.
Preemption is enabled.
- interface
- The interface type and identifier. For detailed keywords and arguments that can be specified as interfaces, refer to Supported Dataplane Interfaces.
- group-id
- The VRRP group to which the interface belongs. The identifier ranges from 1 through 255.
- preempt
- Allows a higher-priority VRRP backup router to assert itself as master over a lower-priority router. Supported values are as follows:
- true: Allow the master router to be preempted by a backup router with higher priority.
- false: Do not allow the master router to be preempted by a backup router with higher priority.
Configuration mode
interfaces interface {
vrrp {
vrrp-group group-id {
preempt preempt
}
}
}Use this command to enable or disable preemption for a VRRP group on an interface.
If preemption is enabled, a backup router with a higher priority than the current master “preempts” the master and becomes the master itself.
A backup router preempts the master by beginning to send its own VRRP advertisements. The master router examines these advertisements and discovers that the backup router has a higher priority than itself. The master then stops sending advertisements, while the backup continues to send, thus, making itself the new master.
Preemption is useful when a lower-performance backup router becomes the master because a higher-performance router fails. In this case, a new higher-performance router can be brought online, and it automatically preempts the lower-performance backup.
Use the set form of the command to enable or disable preemption delay for a VRRP group on an interface.
Use the delete form of the command to restore preemption for a VRRP group on an interface.
Use the show form of the command to view VRRP preemption configuration on an interface.