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M-series, MX-series, and T-series Management Ethernet and Internal Ethernet Interfaces

The JUNOS software automatically creates the routing platform's management Ethernet interface, fxp0, which is an out-of-band management interface for connecting to the router. To use fxp0 as a management port, you must configure its logical interface, fxp0.0, with a valid IP address.

The JUNOS software also creates the internal Ethernet interface, fxp1, which connects the Routing Engine (re0) to the Packet Forwarding Engine. If the routing platform has redundant Routing Engines, another internal Ethernet interface, fxp2, is created on each Routing Engine (re0 and re1) in order to support fault tolerance. Two physical links between re0 and re1 connect the independent control planes. If one of the links fails, both Routing Engines can use the other link for IP communication.

When you enter the show interfaces command, the management Ethernet and internal Ethernet interfaces (and logical interfaces) are displayed:

user@host> show interfaces ?

...
fxp0
fxp0.0
fxp1
fxp1.0
fxp2
fxp2.0
...

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