Configuring a Cellular Interface on Cisco IOS (CDMA)

Jaydien Networks Solutions has recently had the opportunity to get our hands on a Cisco 881 router with a 3G card. Our customer has a Verizon account and we were successfully able to configure it accordingly.
Here are the steps we took:

Activating with Over-the-Air Service Provisioning (Verizon)

To provision and activate your modem using Over-the-Air Service Provisioning (OTASP), use the following command, beginning in EXEC mode: cellular 0 cdma activate otasp phone_number

Configuring a Cellular Interface

To configure the cellular interface, enter the following commands, beginning in privileged EXEC mode.

DETAILED STEPS

Step 1
Router# configure terminal

Enters global configuration mode from the terminal.

Step 2
Router(config)# interface cellular 0

Specifies the cellular interface.
 

Step 3
Router(config-if)# encapsulation ppp

Specifies PPP encapsulation for an interface configured for dedicated asynchronous mode or dial-on-demand routing (DDR).

Step 4
Router(config-if)# ppp chap hostname <hostname>

Defines an interface-specific Challenge Handshake Authentication Protocol (CHAP) hostname. This must match the username given by the carrier. Applies to GSM only.

Step 5
Router(config-if)# ppp chap password 0 <password>

Defines an interface-specific CHAP password. This must match the password given by the carrier.

Step 6
Router(config-if)# asynchronous mode interactive

Returns a line from dedicated asynchronous network mode to interactive mode, enabling the slip and ppp commands in privileged EXEC mode.

Step 7
Router(config-if)# ip address negotiated

Spcifies that the IP address for a particular interface is obtained via PPP and IPCP address negotiation.

Note When the cellular interface requires a static IP address, the address may be configured as ip address negotiated. Through IP Control Protocol (IPCP), the network ensures that the correct static IP address is allocated to the device. If a tunnel interface is configured with ip address unnumbered <cellular interface>, the actual static IP address must be configured under the cellular interface, in place of ip address negotiated. For a sample cellular interface configuration, see the 'Basic Cellular Interface Configuration' section.

Configuring DDR

To configure dial-on-demand routing (DDR) for the cellular interface, follow these steps.

1. configure terminal
2. interface cellular 0
3. dialer in-band
4. dialer idle-timeout >
5. dialer string <string>
6. dialer group <number>
7. exit
8. dialer-list protocol {permit | deny | list | access-group}>
9. ip access-list > permit >
10. line 3
11. script dialer <regexp>
12. exit
13. chat-script <script name> '' 'ATDT*99*<profile number>#' TIMEOUT <timeout value> CONNECT
14. interface cellular 0
15. dialer string <string>

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