Enable IPv4 VRRP Preempt Mode

You can configure VRRP to preempt the existing router. If a new VRRP router is added to the network with a higher priority than the existing routers, then the new router becomes the master. If preempt-mode is disabled, then the new router does not become a master, it transitions to master only when the current master is down, that is when it does not receive any advertisement packets from the current master. By default, preempt-mode is enabled.

Procedure

Enter Interface Configuration mode:

enable

configure terminal

interface GigabitEthernet {slot/port[/sub-port][-slot/port[/sub-port]][,...]} or interface vlan <1–4059>

Note

If the platform supports channelization and the port is channelized, you must also specify the sub-port in the format slot/port/sub-port.
Enter the following command:

ip vrrp <vrid> preempt-mode enable
Use the following command to set the preempt-mode to its default value:

default ip vrrp <vrid> preempt-mode
Use the following command to disable the preempt-mode:

no ip vrrp <vrid> preempt-mode enable

Example

Switch:1> enable
Switch:1# configure terminal
Switch:1(config)# interface gigabitethernet 1/2

Enabling preempt-mode on interface 1/2:

Switch:1(config-if)# ip vrrp 1 preempt-mode enable

Variable definitions

Use the data in the following table to use the ip vrrp <vrid> command.


Variable	Value
`preempt-mode enable`	Enables preempt-mode for VRRPv3 for IPv4.
`default ip vrrp <vrid> preempt-mode`	Sets the default preempt-mode value for VRRPv3 for IPv4.
`no ip vrrp <vrid> preempt-mode enable`	Disables preempt-mode for VRRPv3 for IPv4.