RP/0/RP0/CPU0:R2#configure terminal
Sun Sep  6 23:21:12.360 UTC
RP/0/RP0/CPU0:R2(config)#router ospf 1
RP/0/RP0/CPU0:R2(config-ospf)#area 0
RP/0/RP0/CPU0:R2(config-ospf-ar)#stub
RP/0/RP0/CPU0:R2(config-ospf-ar)#commit
Sun Sep  6 23:21:13.708 UTC

% Failed to commit one or more configuration items during a pseudo-atomic operation. All changes made have been reverted. Please issue 'show configuration failed [inheritance]' from this session to view the errors
RP/0/RP0/CPU0:R2(config-ospf-ar)#show configuration failed
Sun Sep  6 23:21:19.713 UTC
!! SEMANTIC ERRORS: This configuration was rejected by 
!! the system due to semantic errors. The individual 
!! errors with each failed configuration command can be 
!! found below.


router ospf 1
 area 0
  stub
!!% 'OSPF' detected the 'warning' condition 'Error: Backbone area cannot be configured as a stub or NSSA'
 !
!
end

RP/0/RP0/CPU0:R2(config-ospf-ar)#abort
RP/0/RP0/CPU0:R2#show running-config router ospf 1
Sun Sep  6 23:21:25.533 UTC
router ospf 1
 router-id 2.2.2.2
 area 0
  interface Loopback0
   passive enable
  !
  interface GigabitEthernet0/0/0/1
   network point-to-point
  !
  interface GigabitEthernet0/0/0/2
   network point-to-point
  !
 !
 area 1
  interface GigabitEthernet0/0/0/0
   network point-to-point
  !
 !
!

RP/0/RP0/CPU0:R2#show ospf neighbor
Sun Sep  6 23:21:26.275 UTC

* Indicates MADJ interface
# Indicates Neighbor awaiting BFD session up

Neighbors for OSPF 1

Neighbor ID     Pri   State           Dead Time   Address         Interface
3.3.3.3         1     FULL/  -        00:00:32    10.0.23.3       GigabitEthernet0/0/0/1
    Neighbor is up for 01:12:42
4.4.4.4         1     FULL/  -        00:00:38    10.0.24.4       GigabitEthernet0/0/0/2
    Neighbor is up for 01:12:33
1.1.1.1         1     FULL/  -        00:00:31    10.0.12.1       GigabitEthernet0/0/0/0
    Neighbor is up for 01:12:06

Total neighbor count: 3