On R2 and R3, change the serial 1/2 interface to frame-relay.  
OSPF should see the link as point-to-point and there shouldn’t be any DR on this link.  
Also, do not support broadcast on this link.

***********************************************************************



*Mar sh run | b 1/2
interface Serial1/2
 ip address 180.40.7.2 255.255.255.224
 encapsulation frame-relay
 ip ospf network point-to-multipoint non-broadcast
 clock rate 64000
 frame-relay map ip 180.40.7.3 23
!
router ospf 1
 router-id 2.2.2.2
 log-adjacency-changes
 auto-cost reference-bandwidth 1000
 area 0 authentication message-digest
 area 51 nssa no-redistribution no-summary
 area 51 default-cost 0
 area 200 virtual-link 3.3.3.3 message-digest-key 1 md5 notcisco
 redistribute connected subnets tag 2
 network 180.40.7.2 0.0.0.0 area 200
 network 180.40.7.65 0.0.0.0 area 0
 network 202.2.2.2 0.0.0.0 area 51
 network 208.28.1.3 0.0.0.0 area 200
 network 208.28.1.129 0.0.0.0 area 51
 neighbor 180.40.7.3 cost 100
!

R3#sh run | b 1/2
interface Serial1/2
 ip address 180.40.7.3 255.255.255.224
 encapsulation frame-relay
 ip ospf network point-to-multipoint non-broadcast
 frame-relay map ip 180.40.7.2 23
 frame-relay intf-type dce
!
router ospf 1
 router-id 3.3.3.3
 log-adjacency-changes
 auto-cost reference-bandwidth 1000
 area 0 authentication message-digest
 area 200 virtual-link 11.11.11.11 message-digest-key 1 md5 nocisco
 area 200 virtual-link 2.2.2.2 message-digest-key 1 md5 nocisco
 redistribute connected subnets tag 3
 network 17.80.1.1 0.0.0.0 area 51
 network 180.40.7.3 0.0.0.0 area 200
 network 208.28.1.2 0.0.0.0 area 200
 neighbor 180.40.7.2 cost 100
!