router1# configure terminal
router1(config)# interface eth0
router1(config-if)# ip address 10.0.0.170/16
router1(config-if)# exit
router1(config)# router ospf
router1(config-router)# ospf router-id 10.0.0.170
router1(config-router)# network 10.0.0.0/16 area 0
router1(config-router)# network 10.123.0.0/16 area 10.123.0.0
router1(config-router)# exit
router1(config)# exit
router1# write memory
router1# show running-config