1-Port and 2-Port ISDN-PRI Network Module Configuration Note 17
Configuring the PRI Interfaces
Configuring the PRI Interfaces
Whenever you install a new interface, or if you want to change the configuration of an existing
interface, you must configure the interface. If you replace a module that was already configured, the
router recognizes it and brings up the interface in the existing configuration.
Before you configure an interface, have the following information available:
•
T1 or E1 information—for example, clock source, line code, and framing type
•
Channel-group information and time-slot mapping
•
Protocols you plan to route on the new interface
•
IP addresses, subnet masks, network numbers, zones, or other information related to the routing
protocol
Timesaver
Obtain this information from your system administrator or network plan before you
begin router configuration.
To configure a PRI interface, you must use configuration mode (manual configuration). In this mode,
you enter Cisco Internetwork Operating System (Cisco IOS) commands at the router prompt.
The following sections explain how to configure PRI interfaces. 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 nonvolatile random-access memory (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.
If you have questions or need help, refer to the section “Obtaining Service and Support” later in this
document for further information.
Configuring T1 Interfaces
The following procedure can be used to configure a new CT1/PRI or CT1/PRI-CSU module or to
change the configuration of an existing module.
To enter configuration mode, follow this procedure:
Step 1
Connect a console to the router. If you need instructions for connecting a console, refer
to the installation chapter of your router installation and configuration guide. Power up
the router.
Step 2
If the current configuration is no longer valid, after about a minute you see the following
prompt:
Would you like to enter the initial dialog? [yes]:
Answer no. You now enter the normal operating mode of the router.
Note
If the current configuration is valid, you enter the normal operating mode
automatically.
