On "dc-cs2"
router vrrp vlan 821 name dc-rtlab ip address 10.15.64.1/24 tagged trk1 vrrp vrid 249 owner virtual-ip-address 10.15.64.1/24 enable vlan 821 ip ospf area 4 exit exit
On "dc-cs1"
router vrrp vlan 821 name dc-rtlab ip address 10.15.64.2/24 tagged trk1 vrrp vrid 249 backup virtual-ip-address 10.15.64.1/24 enable vlan 821 ip ospf area 4 exit exit