The JUNOS software automatically creates the routing platform's management Ethernet interface, fe-0/0/0, which is an out-of-band management interface for connecting to the router. To use fe-0/0/0 as a management port, you must configure its logical interface, fe-0/0/0.0, with a valid IP address. When you enter the show interfaces command, the management Ethernet interface (and logical interface) is displayed:
user@host> show interfaces
... fe-0/0/0 fe-0/0/0.0 ...