The JUNOS software automatically creates the routing platform's management Ethernet interfaces, ge-0/0/0 through ge-0/0/3, which are out-of-band management interfaces for connecting to the router. To use any of these interfaces as a management port, you must configure a corresponding logical interface, such as ge-0/0/0.0, with a valid IP address. When you enter the show interfaces command, the management Ethernet interfaces (and logical interfaces) are displayed:
user@host> show interfaces
... ge-0/0/0 ge-0/0/0.0 ...