en
config t
host R1
int fa0/0
ip add 172.16.2.1 255.255.255.0
no shutdown

int fa0/1
ip add 2.2.2.5 255.255.255.252
no shut

int s0/0/0
clock rate 64000
band 43008
ip add 2.2.2.1 255.255.255.252
no shut

router ospf 100
passive-interface fa0/0
network 2.2.2.0 0.0.0.7 area 51
network 172.16.2.0 0.0.0.255 area 51

!
--------------------------------------------

en
config t
host R2
int fa0/0
ip add 172.16.1.1 255.255.255.0
no shutdown

int fa0/1
ip add 2.2.2.6 255.255.255.252
no shut


int s0/0/0
band 43008
ip add 2.2.2.2 255.255.
255.252
no shut

router ospf 100
passive-interface fa0/0
network 2.2.2.0 0.0.0.7 area 51
network 172.16.1.0 0.0.0.255 area 51
!