Generally, x/y/z represents the Z port of Y slot in X frame. Generally, a large switch can insert many interface boards, which is called a frame, and X represents the frame number, because a large switch can also cascade multiple sub-frames. . The position of each plate in the frame can also be called a slot, denoted by Y,

There are many ports on the board, and the position is indicated by Z.

This is a very short switch for a small switch. You can think of it as a single board, so the port position is represented by 0/z (0 means being the 0th single board).