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Configuring a Dialer Interface for USB Modem Dial Backup

The dialer interface (dl) is a logical interface configured to establish USB modem connectivity. You can configure multiple dialer interfaces for different functions on the device.

After configuring the dialer interface, you must configure a backup method—either dialer backup, a dialer filter, or dialer watch.

For example, suppose you have a branch office router and a head office router each with a USB modem interface and a dialer interface. To establish a backup connection between the branch office and head office routers, you can configure them as described in Table 71.

Table 71: Configuring Branch Office and Head Office Routers for USB Modem Backup Connectivity

Router Location

Configuration Requirement

Instructions

Branch Office
  1. Configure the logical dialer interface on the branch office router for USB modem dial backup.
  2. Configure the dialer interface dl0 in one of the following ways on the branch office router:
    • Configure the dialer interface dl0 as the backup interface on the branch office router's primary T1 interface t1-1/0/0.
    • Configure a dialer filter on the branch office router's dialer interface.
    • Configure a dialer watch on the branch office router's dialer interface.

Head Office

Configure dial-in on the dialer interface dl0 on the head office router.

To configure dial-in on the head office router, see Configuring Dial-In for a USB Modem Connection.

To configure a logical dialer interface for USB modem dial backup:

  1. Navigate to the top of the interfaces configuration hierarchy in either the J-Web or CLI configuration editor.
  2. Perform the configuration tasks described in Table 72.
  3. To configure a backup method, go on to one of the following tasks:

Table 72: Adding a Dialer Interface for USB Modem Dial Backup

Task

J-Web Configuration Editor

CLI Configuration Editor

Navigate to the Interfaces level in the configuration hierarchy.

  1. In the J-Web interface, select Configuration>Edit Configuration>View and Edit.
  2. Next to Interfaces, click Configure or Edit.

From the [edit] hierarchy level, enter

edit interfaces

Create the new interface—for example, dl0.

Adding a description can differentiate between different dialer interfaces—for example, USB-modem-backup.
  1. Next to Interface, click Add new entry.
  2. In the Interface name box, type dl0.
  3. In the Description box, type USB-modem-backup.
  4. Click OK.

Create and name the interface:

  1. edit dl0
  2. set description USB-modem-backup

Configure Point-to-Point Protocol (PPP) encapsulation.

Note: You cannot configure Cisco High-Level Data Link Control (HDLC) or Multilink PPP (MLPPP) encapsulation on dialer interfaces used in USB modem connections.
  1. In the Encapsulation column, next to the new interface, click Edit.
  2. From the Encapsulation list, select ppp.

Enter

set encapsulation ppp

Create the logical unit 0.

Note: You can set the logical unit to 0 only.
  1. Next to Unit, click Add new entry.
  2. In the Interface unit number box, type 0.
  3. Next to Dialer options, select Yes, and then click Configure.

Enter

set unit 0

Configure dialer options.

  • Activation delay—Number of seconds to wait before activating the backup USB modem interface after the primary interface is down—for example, 30. The default value is 0 seconds, and the maximum value is 60 seconds. Use this option only for dialer backup and dialer watch.
  • Deactivation delay—Number of seconds to wait before deactivating the backup USB modem interface after the primary interface is up—for example, 30. The default value is 0 seconds, and the maximum value is 60 seconds. Use this option only for dialer backup and dialer watch.
  • Idle timeout—Number of seconds a connection is idle before disconnecting—for example, 30. The default value is 120 seconds, and the range is from 0 to 4294967295.
  • Initial route check—Number of seconds to wait before checking if the primary interface is up—for example, 30. The default value is 120 seconds, and the range is from 1 to 300 seconds.
  • Pool—Name of the dialer pool to use for USB modem connectivity—for example, usb-modem-dialer-pool.
  1. In the Activation delay box, type 60.
  2. In the Deactivation delay box, type 30.
  3. In the Idle timeout box, type 30.
  4. In the Initial route check box, type 30.
  5. In the Pool box, type usb-modem-dialer-pool.
  1. Enter

    edit unit 0 dialer-options

  2. Enter

    set activation-delay 60

  3. Enter

    set deactivation-delay 30

  4. Enter

    set idle-timeout 30 initial-route-check 30 pool usb-modem-dialer-pool

Configure the telephone number of the remote destination to call if the primary interface goes down—for example, 5551212.
  1. Next to Dial string, click Add new entry.
  2. In the Dial string box, type 5551212.
  3. Click OK until you return to the Unit page.

Enter

set dial-string 5551212

Configure source and destination IP addresses for the dialer interface—for example, 172.20.10.2 and 172.20.10.1.

Note: If you configure multiple dialer interfaces, ensure that the same IP subnet address is not configured on different dialer interfaces. Configuring the same IP subnet address on multiple dialer interfaces can result in inconsistency in the route and packet loss. Packets can be routed through any of the dialer interfaces with the IP subnet address, instead of being routed through the dialer interface to which the USB modem call is mapped.
  1. Select Inet under Family, and click Edit.
  2. Next to Address, click Add new entry.
  3. In the Source box, type 172.20.10.2.
  4. In the Destination box, type 172.20.10.1.
  5. Click OK.
  1. From the [edit] hierarchy level, enter

    edit interfaces dl0 unit 0

  2. Enter

    set family inet address 172.20.10.2 destination 172.20.10.1

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