See the solution below in Explanation:
Solution:
R30
Config t
router ospf 100
router-id 10.0.1.30
int ran lo0 , e0/0-1
ip ospf 100 a 0
exit
int et0/2
ip ospf 100 a 50
router ospf 30
area 50 range 10.10.0.0 255.255.192.0
area 50 range 10.50.0.0 255.255.192.0
end
wr
R3
Config#int et0/1
config-if#ip ospf priority 255
R20
clear ip ospf process
yes
R10
int et0/0
ip ospf priority 0
R2
Int e0/1
Ip ospf priority 255
End
Copy run start
Ip ospf network point-to-point
Int e0/0
router ospf 10
ip ospf 10 a 0
ip ospf 10 a 50
area 50 range 10.10.0.0 255.255.128.0
area 50 range 10.50.0.0 255.255.128.0