enable
configure terminal
hostname R3
!
interface loopback 1
 ip address 10.10.20.1 255.255.255.0
exit
!
interface loopback 2
 ip address 10.10.30.1 255.255.255.0
exit
!
router eigrp 1
 network 172.16.10.0
 network 10.10.20.0
 network 10.10.30.0
 no auto-summary
exit
!
end
show ip route