Interfaces and Ports

Interfaces are named by type, slot number, module number (always 0), and port number. Port numbering starts with 0. For example:

The built-in Gigabit Ethernet LAN ports 0/0 through 0/3, which are in slot 0, are named ge-0/0/0, ge-0/0/1, ge-0/0/2, and ge-0/0/3.
The first port on a T1 PIM in slot 1 is named t1-1/0/0.