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Transient Interfaces

The M-series and T-series routing platforms contain slots for installing FPC boards, and each FPC can accommodate up to four PICs. The PICs provide the actual physical interfaces to the network. The MX-series routing platforms contain slots for installing DPC boards, and the DPC provides the physical interfaces to the network. These physical interfaces are transient interfaces of the routing platform. They are referred to as transient because you can hot-swap a DPC or FPC and its PICs at any time.

You can insert any FPC or DPC into any slot of the appropriate routing platform. You can generally place any combination of PICs in any location on an FPC. (You are limited by the total FPC bandwidth, and by the fact that some PICs physically require two or four of the PIC locations on the FPC.)

You must configure each of the transient interfaces based on the slot in which the FPC is installed, the location in which the PIC is installed, and for some PICs, the port to which you are connecting.

You can configure the interfaces on PICs that are already installed in the routing platform as well as interfaces on PICs that you plan to install later. The JUNOS software detects which interfaces are actually present, so when the software activates its configuration, it activates only present interfaces and retains the configuration information for the interfaces that are not present. When the JUNOS software detects that an FPC containing PICs has been inserted into the routing platform, the software activates the configuration for those interfaces.

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