Cisco 3640 series router is used in this example.

Basic set up

set hostname

Router# configure terminal
Router(config)# hostname R1

Set telnet password

R1(config)# line vty 0 4
R1(config-line)# password $PASSWORD
R1(config-line)# login
R1(config-line)# exit

Set root password

R1(config)# line console 0
R1(config-line)# password $PASSWORD
R1(config-line)# login
R1(config-line)# exit

Delete root password

R1(config)# line console 0
R1(config-line)# no password
R1(config-line)# exit

Set config password

R1(config)# enable secret $PASSWORD

Basic typology

On router R1

R1#configure terminal
R1(config)#interface fastEthernet 0/0
R1(config-if)#ip address 192.168.12.1 255.255.255.0
R1(config-if)#no shutdown
R1(config-if)#exit
R1(config)#exit
R1#write

On router R2

R2#configure terminal
R2(config)#interface fastEthernet 0/0
R2(config-if)#ip address 192.168.12.2 255.255.255.0
R2(config-if)#no shutdown
R2(config-if)#exit
R2(config)#exit
R2#write

Ping test

On router R1

ping 192.168.12.2

On router R2

ping 192.168.12.1

Check startup-config

show startup-config

Check running-config

show running-config

Show routing table

show ip route

Show interface information

show ip interface brief

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