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# Ethernet Interface Platform Considerations

You can configure Ethernet interfaces on the following E-series routers:

- E120 router
- E320 router
- ERX-1440 router
- ERX-1410 router
- ERX-710 router
- ERX-705 router
- ERX-310 router

This section describes the line modules and I/O modules that support Ethernet interfaces.

For detailed information about the modules that support Fast Ethernet and Gigabit Ethernet interfaces on the ERX-14xx models, ERX-7xx models, and the ERX-310 router:

- See ERX Module Guide, Table 1, Module Combinations for detailed specifications of these modules.
- See ERX Module Guide, Appendix A, Module Protocol Support for information about the protocols and applications that Ethernet modules support.

For detailed information about the modules that support Gigabit Ethernet and 10-Gigabit Ethernet interfaces on the E120 router and the E320 router:

- See E120 and E320 Module Guide, Table 1, Modules and IOAs for detailed specifications of these modules.
- See E120 and E320 Module Guide, Appendix A, IOA Protocol Support for information about the protocols and applications that Ethernet modules support.

## Numbering Scheme

When configuring or managing an interface, you must know the numbering scheme for identifying an interface. The numbering scheme depends on the type of E-series router that you have.

### ERX-7xx Models, ERX-14xx Models, and the ERX-310 Router

Use the slot/port [.subinterface] format to identify Ethernet interfaces and subinterfaces.

- slot—Number of the slot in which the line module resides in the chassis.

  In ERX-7xx models, line module slots are numbered 2-6; slots 0 and 1 are reserved for SRP modules. In ERX-14xx models, line module slots are numbered 0–5 and 8–13; slots 6 and 7 are reserved for SRP modules. In an ERX-310 router, line module slots are numbered 1–2; slot 0 is reserved for the SRP module.

- port—Number of the port on the I/O module.

  On the OC3-2 GE APS I/O module, you can configure only a Gigabit Ethernet interface in port 2; ports 0 and 1 are reserved for OC3/STM1 ATM interfaces.

- subinterface—Subinterface number of the protocol or VLAN subinterface.

For information about installing line modules and I/O modules in ERX routers, see ERX Hardware Guide, Chapter 4, Installing Modules.

### E120 Router and E320 Router

Use the slot/adapter/port [.subinterface] format to identify Ethernet interfaces and subinterfaces.

- slot—Number of the slot in which the line module resides in the chassis.

  In the E120 router, line module slots are numbered 0–5. In the E320 router, line module slots are numbered 0–5 and 11–16. For both routers, slots 6 and 7 are reserved for SRP modules; slots 8–10 are reserved for switch fabric modules (SFMs).

- adapter—Number of the bay in which the I/O adapter (IOA) resides.

  This identifier applies to the E120 and E320 routers only. In the software, adapter 0 identifies the right IOA bay (E120 router) and the upper IOA bay (E320 router); adapter 1 identifies the left IOA bay (E120 router) and the lower IOA bay (E320 router).

- port—Number of the port on the IOA
- subinterface—Subinterface number of the protocol or VLAN subinterface

For information about installing line modules and IOAs in the E120 and E320 routers, see E120 and E320 Hardware Guide, Chapter 4, Installing Modules.

## Interface Specifier

The configuration task examples in this chapter use the format for ERX-7xx models, ERX-14xx models, and the ERX-310 router to specify an Ethernet interface. (The format is described in Numbering Scheme .)

For example, the following command specifies a Fast Ethernet interface on port 0 of an I/O module in slot 4.

`

host1(config)#interface fastEthernet 4/0

`

When you configure a Gigabit Ethernet interface or a 10-Gigabit Ethernet interface on E120 or E320 routers, you must include the adapter identifier as part of the interface specifier. For example, the following command specifies a Gigabit Ethernet interface on port 0 of the IOA installed in the upper adapter bay of slot 3.

`

host1(config)#interface gigabitEthernet 3/0/0

`

For more information about interface types and specifiers on E-series models, see Interface Types and Specifiers in JUNOSe Command Reference Guide.

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