# Before You Configure Transparent Bridging

Before you configure transparent bridging on an E Series router, verify that:

- You have correctly installed a line module that supports transparent bridging. For a list of the line modules that support transparent bridging, see ERX Module Guide, Appendix A, Module Protocol Support or E120 and E320 Module Guide, Appendix A, IOA Protocol Support for information about the modules that support transparent bridging.
- Each configured line can transmit data to and receive data from your switch connections.

Table 28 lists the prerequisite tasks for configuring transparent bridging and the resources that you can consult to learn how to perform these tasks.

Table 28: Prerequisite Tasks for Configuring Transparent Bridging

To Learn About | See
--- | ---
Preconfiguration and hardware diagnostic procedures | ERX Hardware Guide E120 and E320 Hardware Guide
Configuring T3 ATM line modules | Configuring T3 and E3 Interfaces in JunosE Physical Layer Configuration Guide
Configuring OCx/STMx ATM line modules | Configuring Unchannelized OCx/STMx Interfaces in JunosE Physical Layer Configuration Guide
Configuring Ethernet line modules | Configuring Ethernet Interfaces in JunosE Physical Layer Configuration Guide

Also have the following information available:

- A diagram of your network topology indicating the names of the bridge groups and bridge group interfaces that you need to create
- On ERX7xx models, ERX14xx models, and ERX310 router, the slot and port numbers of the line modules over which you want to configure transparent bridging
- On E120 and E320 routers, slot, adapter, and port numbers of the IOAs over which you want to configure transparent bridging
- Types and specifiers for the interfaces and subinterfaces over which you want to create bridge group interfaces