Implement OSPF in VRF’s

To add particular VRF to OSPF process just use the command:
router ospf 1 vrf vrfname

Example:

R1:
router ospf 1 vrf CustA
router-id 1.0.0.1
network 10.1.1.0 0.0.0.255 area 0
network 192.168.1.0 0.0.0.255 area 0
!
router ospf 2 vrf CustB
router-id 1.0.0.2
network 10.1.1.0 0.0.0.255 area 0
network 192.168.1.0 0.0.0.255 area 0
!
router ospf 3 vrf CustC
router-id 1.0.0.3
network 10.1.1.0 0.0.0.255 area 0
network 192.168.1.0 0.0.0.255 area 0
!

R2:
router ospf 1 vrf CustA
router-id 2.0.0.2
network 20.1.1.0 0.0.0.255 area 0
network 192.168.1.0 0.0.0.255 area 0
!
router ospf 2 vrf CustB
router-id 2.0.0.1
network 20.1.1.0 0.0.0.255 area 0
network 192.168.1.0 0.0.0.255 area 0
!
router ospf 3 vrf CustC
router-id 2.0.0.3
network 20.1.1.0 0.0.0.255 area 0
network 192.168.1.0 0.0.0.255 area 0
!