Configure the Internal Ethernet Interface
The internal Ethernet interface,
fxp1, connects the Routing Engine with the System Control Board (SCB), System and Switch Board (SSB), Forwarding Engine Board (FEB), or Switching and Forwarding Module (SFM), depending on router model, in the Packet Forwarding Engine. The router software automatically configures this interface.
Do not modify or remove the configuration for the internal Ethernet interface that the JUNOS software automatically configures. If you do, the router will stop functioning.
user@host>show configuration...interfaces {...fxp1 {unit 0 {family tnp {address 1;}}}}