1-Port and 2-Port ISDN-PRI Network Module Configuration Note 21
Configuring the PRI Interfaces
Step 5
If you have not configured the router before, or want to change the configuration,
configure global parameters, passwords, network management, and routing protocols. In
this example, IP routing, AppleTalk routing, and IPX routing are all enabled:
Router(config)# ip routing
Router(config)# appletalk routing
Router(config)# ipx routing
For complete information about global configuration commands, refer to the Cisco IOS
configuration guides and command references.
Step 6
Enter the controller e1 command to select the CE1/PRI interface to configure. For
example, to configure an E1 interface in slot 1 and unit 0, enter the following command:
Router(config)# cont e1 1/0
Step 7
Specify the framing type:
Router(config-controller)# framing crc4
Step 8
Specify the channel group and time slots to be mapped. The command shown sets the
channel group to 0 and selects time slots 1, 3 through 5, and 7 for mapping:
Router(config-controller)# channel-group 0 timeslots 1,3-5,7
Router(config-controller)#
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1:0, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1:0, changed state to up
Router(config-controller)#
Router(config-controller)#
Step 9
After you define E1 channel groups, you can configure each channel group as a virtual
serial interface. Specify the CE1/PRI interface, unit number, and channel group to
modify, as in the following example:
Router(config-controller)# int serial 1/0:0
Step 10
Assign an IP address and subnet mask to the interface using the ip address command,
substituting the appropriate IP address and subnet mask for your site:
Router(config-if)# ip address 1.1.15.1 255.255.255.0
Router(config-if)#
Step 11
Add any configuration commands needed to enable routing protocols or adjust the
interface characteristics. Refer to the Cisco IOS configuration guides and command
references for more information.
Step 12
If your router has more than one CE1/PRI interface, enter the exit command to return to
the Router(config)# prompt. Repeat Step 6 through Step 11 of this procedure to configure
the next CE1/PRI interface.
Step 13
By default, the router allocates 25 percent of dynamic random-access memory (DRAM)
to shared memory (used for data transmitted or received by network modules and WAN
interface cards). If your router includes multiple ISDN PRI interfaces, you must increase
the amount of shared memory by entering the memory-size iomem command. The
following example increases shared memory from 25 percent to 40 percent:
Router(config)# memory-size iomem 40
