# Ethernet Interface Platform Considerations

You can configure Ethernet interfaces on the following E Series Broadband Services Routers:

- E120 Broadband Services Router
- E320 Broadband Services Router
- ERX1440 router
- ERX1410 router
- ERX710 router
- ERX705 router
- ERX310 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 ERX14xx models, ERX7xx models, and the ERX310 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 and E320 Broadband Services routers:

- 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.

### ERX7xx Models, ERX14xx Models, and the ERX310 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 ERX7xx models, line module slots are numbered 2-6; slots 0 and 1 are reserved for SRP modules. In ERX14xx models, line module slots are numbered 0–5 and 8–13; slots 6 and 7 are reserved for SRP modules. In an ERX310 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 and E320 Routers

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 ERX7xx models, ERX14xx models, and the ERX310 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.