For R1 example:
enable
conf t
hostname XXXX-R1
enable secret XXXX
line con 0
login
password xxxx
line aux 0
login
password xxxx
line vty 0 4
login
password xxxx
exit
int f0/0
no shutdown
int s0/0
clock rate 1000000
no shutdown
int s0/1
no shutdown
int s0/2
clock rate 1000000
no shutdown
exit
exit
copy run start
show start
show ip int brief
For R2 example:
enable
conf t
hostname XXXX-R2
int f0/0
no shutdown
int f0/1
no shutdown
int s0/1
no shutdown
exit
exit
copy run start
show start
show ip int brief
For R3 example:
enable
conf t
hostname XXXX-R3
int f0/0
no shutdown
int s0/0
clock rate 1000000
no shutdown
int f0/1
no shutdown
int s0/2
no shutdown
exit
exit
copy run start
show start
show ip int brief
For R4 example:
enable
conf t
hostname XXXX-R4
int f0/0
no shutdown
int s0/0
clock rate 1000000
no shutdown
int s0/1
no shutdown
exit
exit
copy run start
show start
show ip int brief