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CLI-based Configuration Guide - Interface Management

AR100, AR120, AR160, AR1200, AR2200, AR3200, and AR3600 V300R003

This document provides the basic concepts, configuration procedures, and configuration examples of the interfaces supported by the device.
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Configuring C-DCC for Dial-up Connection

Configuring C-DCC for Dial-up Connection

To use LTE cellular interfaces to connect to an LTE network, you must configure circular dial control center (C-DCC) for dial-up connection.


Based on different triggering mode, the LTE link dial-up modes can be classified into the following types:

  • Automatic dial-up (permanently online)

    The DCC attempts to dial the PGW immediately after the device starts. The dialing process does not need to be triggered by data packets. If a connection cannot be established with the PGW, the DCC retries at an interval.

    This mode applies to the scenarios in which users are not charged based on traffic or time. For example, if a yearly-package service is used, users are not charged based on link traffic or time within the service duration.

  • Dial-on-demand (not permanently online; link establishment triggered by traffic)

    The device triggers link establishment only when data needs to be transferred. When the time during which no traffic is transmitted on the link exceeds the timeout duration, the device disconnects the link to reduce traffic volume.

    This mode applies to the scenarios in which users are charged based on traffic or time. For example, if a traffic-package service is used, users are allowed to use certain traffic within the service duration.

Based on different link-layer protocols used by an LTE link, the LTE link dial-up modes can be classified into the following types:
  • PPP dial-up: In this mode, PPP is used as the link-layer protocol and the LTE link obtains an IP address through PPP negotiation (configured using the ip address ppp-negotiate command).
  • WWAN dial-up: In this mode, WWAN is used as the link-layer protocol and the LTE link dynamically obtains an IP address (configured using the ip address negotiate command).

Pre-configuration Tasks

Before configuring C-DCC for dial-up connection, complete the following tasks:

  1. Setting connection parameters of LTE cellular interfaces
  2. Obtaining dialer numbers from the carrier


  1. Configure a dialer control list.


    Configures on-demand dialing.

    1. Run system-view

      The system view is displayed.

    2. Run dialer-rule

      The dialer rule view is displayed.

    3. Run dialer-rule dialer-rule-number { acl { acl-number | name acl-name } | ip { deny | permit } | ipv6 { deny | permit } }

      A dialer control list is specified for a dialer access group to define conditions for initiating calls.

    4. Run quit

      Return to the system view.

  2. Enable C-DCC.
    1. Run interface cellular interface-number

      An LTE cellular or LTE channel interface is created and the interface view is displayed.

      When the multi-APN function is configured, the LTE channel interface view is displayed; otherwise, the LTE cellular interface view is displayed.

    2. Run dialer enable-circular

      C-DCC is enabled, the dialer number and IP address assigns automatically.

      By default, the C-DCC function is disabled on an interface.

    3. Run dialer-group group-number

      The dialer access group is configured for the dialer interface.

      By default, no dialer group is configured.


      Make sure that the value of group-number in the dialer-group command is the same as that of dialer-rule-number in the dialer-rule command.

    4. (Optional) Run rssi-threshold rssi-threshold

      The received signal strength indicator (RSSI) threshold is set for successfully establishing LTE links.

      By default, an LTE data card does not establish an LTE link based on the RSSI threshold.

  3. Obtain IP addresses.

    • When two LTE data cards are used to connect to the Internet through dual uplinks, the LTE links use the PPP dial-up mode.

      1. Run ip address ppp-negotiate

        The local interfaces are configured to obtain IP addresses assigned by the peer through PPP negotiation.

    • For other scenarios, the WWAN dial-up mode is used.

      Run ip address negotiate

      The LTE cellular interfaces or LTE channel interfaces are configured to dynamically obtain IP addresses.

  4. Run dialer number dial-number [ autodial ]

    A dialer number is configured.

    Obtain the dialer number from the carrier.

    The autodial parameter indicates the automatic dial-up mode. By default, the automatic dial-up interval is 300 seconds. You can run the dialer timer autodial command to set the automatic dial-up interval. If the autodial parameter is not specified in the command, the dial-on-demand mode is used.

  5. Run quit

    Return to the system view.

  6. Run ip route-static 0 { nexthop-address | interface-type interface-number } [ preference preference ]

    A default route is configured.

Verifying the Configuration

  • Run the display cellular interface-number { all | hardware | security | network | profile | radio } command to check information about all call sessions on the LTE data card.
Updated: 2019-03-06

Document ID: EDOC1100069331

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