RouterA#sh run
Building configuration...

Current configuration:
!
version 11.2
no service password-encryption
no service udp-small-servers
no service tcp-small-servers
!
hostname RouterA
!
!
!
interface Ethernet0
ip address 172.16.10.1 255.255.255.0
!
interface Serial0
ip address 172.16.20.1 255.255.255.0
no fair-queue
!
interface Serial1
no ip address
shutdown
!

!
router igrp 10
network 172.16.0.0
!
no ip classless
!
!
line con 0
line aux 0
line vty 0 4
login
!
end