Management Ethernet and Internal Ethernet Interfaces

The M Series and T Series routers have both a management Ethernet interface and one or two internal Ethernet interfaces. The J Series router has a management Ethernet interface. These interfaces are described in the following sections:

• M Series, MX Series, and T Series Management Ethernet and Internal Ethernet Interfaces
• J Series Management Ethernet Interface

For more information, see show interfaces (J Series Router Management Ethernet) and show interfaces (M Series and T Series Router Management and Internal Ethernet).

M Series, MX Series, and T Series Management Ethernet and Internal Ethernet Interfaces

The JUNOS Software 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 Software 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:

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

TX Matrix Plus and T1600 Router (Routing Matrix) Management Ethernet Interfaces

For Juniper Networks TX Matrix Plus Routers and for T1600 Core Routers configured in a routing matrix, the JUNOS Software 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:

...
em0
em0.0
...

Note: The Routing Engines in the TX Matrix Plus router and in the T1600 routers configured in a routing matrix do not support the management Ethernet interface fxp0, or the internal Ethernet interfaces fxp1 or fxp2.

TX Matrix Plus Router Internal Ethernet Interfaces

On a TX Matrix Plus router, the Routing Engine (RE-TXP-SFC) and Control Board (TXP-CB) function as a unit, or host subsystem. For each host subsystem in the router, the JUNOS Software automatically creates two internal Ethernet interfaces, ixgbe0 and ixgbe1, for the two 10-Gigabit Ethernet ports on the Routing Engine.

When you enter the show interfaces command on a TX Matrix Plus router, the internal Ethernet interfaces (and logical interfaces) are displayed:

...
ixgbe0
ixgbe0.0
ixgbe1
ixgbe1.0
...

T1600 Routers (Routing Matrix) Internal Ethernet Interfaces

On a T1600 router configured in a routing matrix, the Routing Engine (RE-TXP-LCC) and Control Board (LCC-CB) function as a unit, or host subsystem. For each host subsystem in the router, the JUNOS Software automatically creates two internal Ethernet interfaces, bcm0 and em1, for the two Gigabit Ethernet ports on the Routing Engine.

For more information about the management Ethernet interface and internal Ethernet interfaces on a TX Matrix Plus router and T1600 routers configured in a routing matrix, see the JUNOS Network Interfaces Configuration Guide.

J Series Management Ethernet Interface

The JUNOS Software automatically creates the router’s management Ethernet interfaces, ge-0/0/0 through ge-0/0/3, which are out-of-band management interfaces for connecting to the router. To use any of these interfaces as a management port, you must configure a corresponding logical interface, such as ge-0/0/0.0, with a valid IP address. When you enter the show interfaces command, the management Ethernet interfaces (and logical interfaces) are displayed:

...
ge-0/0/0
ge-0/0/0.0
...