R2#sh run | b ip dhcp
ip dhcp pool Prob14
   host 20.10.1.2 255.255.255.0
   hardware-address 0013.80e2.0000
   default-router 20.20.1.1
!
interface FastEthernet0/1
 ip address 20.10.1.1 255.255.255.0
 ip helper-address 208.28.1.99
 duplex auto
 speed auto
!
R7#sh run int s1/0.2
Building configuration...

Current configuration : 261 bytes
!
interface Serial1/0.2 point-to-point
 ip address 180.40.7.161 255.255.255.224
 ip helper-address 208.28.1.99
 ip ospf network point-to-multipoint
 frame-relay priority-dlci-group 1 702 702 702 702
 frame-relay interface-dlci 702 protocol ip 180.40.7.162
end