conf t
hostname R1
interface loopback 1
description Engineering Department
ip address 10.1.1.1 255.255.255.0
interface loopback 30
ip address 172.30.30.1 255.255.255.252
interface serial 0/0/0
ip address 10.1.12.1 255.255.255.0
clockrate 64000
no shutdown

router ospf 1
network 10.1.12.0 0.0.0.255 area 0
network 10.1.1.0 0.0.0.255 area 0
exit
interface loopback 1
ip ospf network point-to-point

router ospf 1
default-information originate always

tclsh
foreach address {
10.1.1.1
10.1.2.1
10.1.3.1
10.1.12.1
10.1.12.2
10.1.23.2
10.1.23.3
172.30.30.1
192.168.100.1
192.168.101.1
192.168.102.1
192.168.103.1
} {
ping $address }