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Disabling Preempt
The preempt command is enabled by default. The command forces the system to change the MASTER
router if another router with a higher priority comes online.
Prevent the BACKUP router with the higher priority from becoming the MASTER router by disabling preempt.
NOTE:
You must configure all virtual routers in the VRRP group the same: you must configure all with
preempt enabled or configure all with preempt disabled.
Because preempt is enabled by default, disable the preempt function with the following command.
•
Prevent any BACKUP router with a higher priority from becoming the MASTER router.
INTERFACE-VRID mode
no preempt
Examples of Disabling Preempt
Re-enable preempt by entering the preempt command. When you enable preempt, it does not display in the
show commands, because it is a default setting.
The following example shows how to disable preempt using the no preempt command.
Dell(conf-if-te-1/1/1)#vrrp-group 111
Dell(conf-if-te-1/1/1-vrid-111)#no preempt
Dell(conf-if-te-1/1/1-vrid-111)#
The following example shows how to verify preempt is disabled using the show conf command.
Dell(conf-if-te-1/1/1-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
Changing the Advertisement Interval
By default, the MASTER router transmits a VRRP advertisement to all members of the VRRP group every one
second, indicating it is operational and is the MASTER router.
If the VRRP group misses three consecutive advertisements, the election process begins and the BACKUP
virtual router with the highest priority transitions to MASTER.
NOTE:
To avoid throttling VRRP advertisement packets, Dell Networking OS recommends increasing the
VRRP advertisement interval to a value higher than the default value of one second. If you do change the
time interval between VRRP advertisements on one router, change it on all participating routers.
If are using VRRP version 2, you must configure the timer values in multiple of whole seconds. For example a
timer value of 3 seconds or 300 centisecs are valid and equivalent. However, a time value of 50 centisecs is
invalid because it not a multiple of 1 second. If you are using VRRP version 3, you must configure the timer
values in multiples of 25 centisecs.
Virtual Router Redundancy Protocol (VRRP)
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Troubleshooting
