Reference Guide

1052 | Virtual Router Redundancy Protocol (VRRP)
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Prevent the BACKUP router with the higher priority from becoming the MASTER router by disabling
preempt.
Since preempt is enabled by default, disable the preempt function with the following command in the
VRRP mode. Re-enable preempt by entering the preempt command. When preempt is enabled, it does not
display in the show commands, because it is a default setting.,
Figure 54-11. Command Example: no preempt
Figure 54-12. Command Example Display: show config in VRID mode
Change the Advertisement interval
By default, the MASTER router transmits a VRRP advertisement to all members of the VRRP group every
1 second, indicating it is operational and is the MASTER router. If the VRRP group misses 3 consecutive
advertisements, then the election process begins and the BACKUP virtual router with the highest priority
transitions to MASTER.
Note: All virtual routers in the VRRP group must be configured the same: all configured with preempt
enabled or configured with preempt disabled.
Task Command Syntax Command Mode
Prevent any BACKUP router with a higher priority
from becoming the MASTER router.
no preempt
INTERFACE-VRID
Note: Dell Force10 recommends you to increase the VRRP advertisement interval to a value
higher than the default value of 1 second to avoid throttling VRRP advertisement packets. If you do
change the time interval between VRRP advertisements on one router, you must change it on all
participating routers.
FTOS(conf-if-gi-1/1)#vrrp-group 111
FTOS(conf-if-gi-1/1-vrid-111)#no preempt
FTOS(conf-if-gi-1/1-vrid-111)#show conf
FTOS(conf-if-gi-1/1-vrid-111)#show conf
!
vrrp-group 111
authentication-type simple 7 387a7f2df5969da4
no preempt
priority 255
virtual-address 10.10.10.1
virtual-address 10.10.10.2
virtual-address 10.10.10.3
virtual-address 10.10.10.10
FTOS(conf-if-gi-1/1-vrid-111)#