CLI Guide

Layer 3 Routing Commands 1890
vrrp preempt
Use the vrrp preempt command in Interface Configuration mode to set the
preemption mode value for the virtual router configured on a specified
interface. Use the no form of the command to disable preemption mode.
Syntax
vrrp group preempt [delay seconds]
no vrrp group preempt
• group—The virtual router identifier. (Range: 1-255)
• seconds—The number of seconds the VRRP router will wait before issuing
an advertisement claiming master ownership.
Default Configuration
Enabled is the default configuration. Delay defaults to 0 seconds.
Command Mode
Interface Configuration (VLAN) mode.
User Guidelines
As per the VRRP RFC, when preemption is enabled, the backup router
discards the advertisements until the masterdowntimer starts. This feature
requires immediate sending of advertisements when the preemption case
occurs and the delay is 0. This is a violation according to the RFC 3768.
Delay, if configured, will cause the VRRP router to wait the specified number
of seconds before issuing an advertisement claiming master ownership.
Example
The following example sets the preemption mode value for the virtual router
for VLAN 15.
console(config)#interface vlan 15
console(config-if-vlan15)#vrrp 5 preempt