# Layer 2 Services over MPLS Platform Considerations

To configure layer 2 services over MPLS, you must first configure the underlying layer 2 service (ATM, bridged Ethernet, Fast Ethernet, Gigabit Ethernet, 10-Gigabit Ethernet, Frame Relay, or HDLC) and MPLS.

## Module Requirements

For information about the modules that support the underlying layer 2 service and MPLS on ERX14xx models, ERX7xx models, and the ERX310 Broadband Services Router:

- See ERX Module Guide, Table 1, Module Combinations for detailed module specifications.
- See ERX Module Guide, Appendix A, Module Protocol Support for information about the modules that support the underlying layer 2 service and MPLS.

For information about the modules that support the underlying layer 2 service and MPLS on the E120 or E320 Broadband Services Router:

- See E120 and E320 Module Guide, Table 1, Modules and IOAs for detailed module specifications.
- See E120 and E320 Module Guide, Appendix A, IOA Protocol Support for information about the modules that support the underlying layer 2 service and MPLS.

  | Note: In the current release, the E120 and E320 routers supports all layer 2 services over MPLS shown in the bulleted list in Layer 2 Services over MPLS Overview except ATM with AAL5 encapsulation, ATM with VCC cell relay encapsulation, Frame Relay, and HDLC.

## Interface Specifiers

Many of the configuration task examples in this chapter use the slot/port[.subinterface ] format to specify the physical interface for the underlying layer 2 service. However, the interface specifier format that you use depends on the router that you are using.

For ERX7xx models, ERX14xx models, and ERX310 routers, use the slot/port[.subinterface ] format. For example, the following command specifies ATM 1483 subinterface 10 on slot 0, port 1 of an ERX7xx model, ERX14xx model, or ERX310 router.

host1(config)#interface atm 0/1.10

For the E120 router and the E320 router, use the slot/adapter/port[.subinterface ] format, which includes an identifier for the bay in which the I/O adapter (IOA) resides. 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). For example, the following command specifies ATM 1483 subinterface 20 on slot 5, adapter 0, port 0 of an E320 router.

host1(config)#interface atm 5/0/0.20

#### Related Topics

- For more information about supported interface types and specifiers on E Series routers, seeInterface Types and Specifiers in the JunosE Command Reference Guide