Cisco Nexus 3548

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Cisco Nexus 3548 Switch NX-OS Unicast Routing Command Reference
OL-27852-01
Chapter Unicast Routing Commands
preempt (VRRP)
preempt (VRRP)
To enable a high-priority backup virtual router to preempt the low-priority master virtual router, use the
preempt command. To disable a high-priority backup virtual router from preempting the low-priority
master virtual router, use the no form of this command.
preempt
no preempt
Syntax Description This command has no arguments or keywords.
Command Default Enabled
Command Modes VRRP configuration mode
Command History
Usage Guidelines VRRP enables you to preempt a virtual router backup that has taken over for a failing virtual router
master with a high-priority virtual router backup that has become available.
By default, a preemptive scheme is enabled. A backup high-priority virtual router that becomes available
takes over for the backup virtual router that was elected to become the virtual router master. If you
disable preemption, the backup virtual router that is elected to become the virtual router master remains
the master until the original virtual router master recovers and becomes the master again.
Note This preemption does not apply to the primary IP address.
If the virtual IP address is also the IP address for the interface, then preemption is applied.
This command requires the LAN Base Services license.
Examples This example shows how to enable the backup high-priority virtual router to preempt the low-priority
master virtual router:
switch# configure terminal
switch(config)# interface ethernet 2/1
switch(config-if)# no switchport
switch(config-if)# vrrp 250
switch(config-if-vrrp)# preempt
switch(config-if-vrrp)#
Release Modification
5.0(3)A1(1) This command was introduced.