Junos OS Interfaces Command Reference - Juniper Networks

Junos OS 12.1 Interfaces Command Reference
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Management Ethernet and Internal Ethernet Interfaces Overview (M Series, MX
Series, T Series)
The M Series and T Series routers have both a management Ethernet interface and one
or two internal Ethernet interfaces.
The Junos OS automatically creates the router’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 OS also creates the internal Ethernet interface, fxp1, which connects the Routing
Engine (re0) to the Packet Forwarding Engine. If the router 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
...
TX Matrix Plus and T1600 Router (Routing Matrix) Management Ethernet
Interfaces
For TX Matrix Plus Routers and for T1600 Core Routers with RE-C1800 configured in a
routing matrix, the Junos OS automatically creates the router’s management Ethernet
interface, em0. To use em0 as a management port, you must configure its logical port,
em0.0, with a valid IP address.
When you enter the show interfaces command on a TX Matrix Plus router, the
management Ethernet interfaces (and logical interfaces) are displayed:
user@host> show interfaces ?
...
em0
em0.0
...
NOTE: The Routing Engines in the TX Matrix Plus router and in the T1600
routers with RE-C1800 configured in a routing matrix do not support the
management Ethernet interface fxp0, or the internal Ethernet interfaces fxp1
or fxp2.
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