getting help
can “explore” a command to figure out the syntax:
router(config-if)#ip addr ?
A.B.C.D IP address
router(config-if)#ip addr 169.222.64.1 ?
A.B.C.D IP subnet mask
router(config-if)#ip addr 169.222.64.1 255.255.255.0 ?
secondary Make this IP address a secondary address
<cr>
router(config-if)#ip addr 169.222.64.1 255.255.255.0
router(config-if)#