In the interface et-3/2/0, what does the number 3 represent?

In the context of Juniper Networks interfaces, the number three in the interface notation et-3/2/0 represents the Flexible PIC Concentrator (FPC) number. Each interface name includes these hierarchical identifiers that specify the location of the interface on the device.

The FPC is a hardware component in the chassis that holds the Physical Interface Cards (PICs). The first number indicates which FPC the interface belongs to, while the second number represents the PIC, and the last number represents the port number on that PIC. Understanding this notation is crucial for correctly identifying where interfaces are located within a Juniper device, aiding in troubleshooting and configuration tasks. Therefore, recognizing that the number three signifies the FPC allows for better comprehension of the interface structure and organization within the overall device architecture.