R1

interface FastEthernet0/0

ip address 192.168.0.1 255.255.255.0
duplex full

! interface FastEthernet1/0

ip address 172.16.1.1 255.255.255.0
duplex auto
speed auto

! interface FastEthernet1/1

ip address 172.16.3.1 255.255.255.0
duplex auto
speed auto

R2

interface FastEthernet0/0

ip address 192.168.1.1 255.255.255.0
duplex full

! interface FastEthernet1/0

ip address 172.16.1.2 255.255.255.0
duplex auto
speed auto

! interface FastEthernet1/1

ip address 172.16.2.1 255.255.255.0
duplex auto
speed auto

interface FastEthernet1/0

ip address 172.16.2.2 255.255.255.0
duplex auto
speed auto

!

interface FastEthernet1/1

ip address 172.16.3.2 255.255.255.0
duplex auto
speed auto

! router ospf 1

log-adjacency-changes
network 172.16.2.0 0.0.0.255 area 50
network 172.16.3.0 0.0.0.255 area 50

!