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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:
•
•
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
Step 1
Router> enable
Password: password
Router#
Step 2
Router# configure terminal
Enter configuration commands, one per line.
End with CNTL/Z.
Router(config)#
Step 3
Router# ip routing
Router# appletalk routing
Router# ipx routing
Step 4
Router(config)# controller t1 1/0
Step 5
Router(config-controller)# clock source
line
OL-1957-03
Connect a console to the router.
Power on the router.
Software Configuration Guide for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers
Configuring T1 and E1 Interfaces
Purpose
Enter enable mode. Enter the password.
You have entered enable mode when the prompt
changes to
.
Router#
Enter global configuration mode. You have
entered global configuration mode when the
prompt changes to
Router(config)#.
Enable routing protocols as required for your
global configuration. This example uses IP
routing, AppleTalk routing, and Internetwork
Packet Exchange (IPX) routing.
Select the CT1/PRI interface to configure. This
example configures a T1 interface in slot 1 and
unit 0.
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.
3-15
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