I configured a router interface E0 with command"ip address x.x.x.x y.y.y.y" only, but when I "show run", i found there's an extra command under E0(see below) which is "no ip directed-broadcast". I can't remove this line, not sure what this line is doing.
description : connect to O6LXC29OOBC01(switch)
ip address x.x.x.x y.y.y.y
no ip directed-broadcast