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Software Configuration Guide for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers

OL-1957-03

Chapter 3 Configuring with the Command-Line Interface

Configuring T1 and E1 Interfaces

To configure an ISDN PRI interface or T1/E1 multiflex trunk interface, use the configuration software

provided with your router or network module, if any. Otherwise, for greatest power and flexibility use

configuration mode (manual configuration). In this mode, you enter Cisco IOS commands at the router

prompt.

Note Before you begin, disconnect all WAN cables from the router to keep it from trying to run the

AutoInstall process. The router tries to run AutoInstall whenever you power it on if there is a WAN

connection on both ends and the router does not have a valid configuration file stored in NVRAM

(for instance, when you add a new interface). It can take several minutes for the router to determine

that AutoInstall is not connected to a remote Transmission Control Protocol/Internet Protocol

(TCP/IP) host.

This section describes basic configuration, including enabling the interface and specifying IP routing.

Depending on your own requirements and the protocols you plan to route, you might also need to enter

other configuration commands.

Before you begin configuring the interfaces, make sure you:

• Connect a console to the router.

• Power on the router.

Configuring T1 Interfaces

Use the following procedure to configure a new T1, CT1/PRI or CT1/PRI-CSU interface or to change

the configuration of an existing interface.

Command Purpose

Step 1

Router> enable

Password: password

Router#

Enter enable mode. Enter the password.

You have entered enable mode when the prompt

changes to

Router#.

Step 2

Router# configure terminal

Enter configuration commands, one per line.

End with CNTL/Z.

Router(config)#

Enter global configuration mode. You have

entered global configuration mode when the

prompt changes to

Router(config)#.

Step 3

Router# ip routing

Router# appletalk routing

Router# ipx routing

Enable routing protocols as required for your

global configuration. This example uses IP

routing, AppleTalk routing, and Internetwork

Packet Exchange (IPX) routing.

Step 4

Router(config)# controller t1 1/0

Select the CT1/PRI interface to configure. This

example configures a T1 interface in slot 1 and

unit 0.

Step 5

Router(config-controller)# clock source

line

Specify which end of the circuit provides

clocking. The clock source should be set to use

internal clocking only for testing the network or if

the full T1 line is used as the channel group. Only

one end of the T1 line should be set to internal.

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