On "mc-cs2"
router vrrp vlan 822 name mc-rtlab ip address 10.15.79.1/24 ip helper-address 129.97.15.253 tagged trk1 forbid trk2,trk3 ip ospf area 4 ip ospf passive vrrp vrid 248 owner virtual-ip-address 10.15.79.1/24 enable exit exit
On "mc-cs1"
router vrrp vlan 822 name mc-rtlab ip address 10.15.79.2/24 ip helper-address 129.97.15.253 tagged trk1 forbid trk3 ip ospf area 4 ip ospf passive vrrp vrid 248 backup virtual-ip-address 10.15.79.1/24 enable exit exit