interactive configuration
enter configuration mode, using “configure term”
prompt gives a hint about where you are:
router#configure term
router(config)#ip classless
router(config)#ip subnet-zero
router(config)#int e3
router(config-if)#ip addr 169.222.31.33 255.255.255.224
router(config-if)#no shut
router(config-if)#^Z