Layer 3 Routing Commands 1813vrrp preemptUse the vrrp preempt command in Interface Configuration mode to set thepreemption mode value for the virtual router configured on a specifiedinterface. Use the no form of the command to disable preemption mode.Syntaxvrrp 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 issuingan advertisement claiming master ownership.Default ConfigurationEnabled is the default configuration. Delay defaults to 0 seconds.Command ModeInterface Configuration (VLAN) mode.User GuidelinesAs per the VRRP RFC, when preemption is enabled, the backup routerdiscards the advertisements until the masterdowntimer starts. This featurerequires immediate sending of advertisements when the preemption caseoccurs 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 numberof seconds before issuing an advertisement claiming master ownership.ExampleThe following example sets the preemption mode value for the virtual routerfor VLAN 15.console(config)#interface vlan 15console(config-if-vlan15)#vrrp 5 preempt
