As versões mantidas com suporte 1.2.20 e acima suportam as configurações de configuração referentes ao ARP gratuito, vrrp_garp_master_refresh é o que eu preciso.
# delay for second set of gratuitous ARPs after transition to MASTER
vrrp_garp_master_delay 10 # seconds, default 5, 0 for no second set
# number of gratuitous ARP messages to send at a time after transition to MASTER
vrrp_garp_master_repeat 1 # default 5
# delay for second set of gratuitous ARPs after lower priority advert received when MASTER
vrrp_garp_lower_prio_delay 10
# number of gratuitous ARP messages to send at a time after lower priority advert received when MASTER
vrrp_garp_lower_prio_repeat 1
# minimum time interval for refreshing gratuitous ARPs while MASTER
vrrp_garp_master_refresh 60 # secs, default 0 (no refreshing)
# number of gratuitous ARP messages to send at a time while MASTER
vrrp_garp_master_refresh_repeat 2 # default 1
# Delay in ms between gratuitous ARP messages sent on an interface
vrrp_garp_interval 0.001 # decimal, seconds (resolution usecs). Default 0.
# Delay in ms between unsolicited NA messages sent on an interface
vrrp_gna_interval 0.000001 # decimal, seconds (resolution usecs). Default 0.