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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 an IMA Group

Configuring an IMA Group

An IMA group binds one or multiple E1-IMA links or G.SHDSL links into a high-speed logical link. It provides high bandwidth and supports high-speed ATM cell stream.

Applicable Scenario

When you require high bandwidth that a single E1-IMA link or G.SHDSL link cannot provide, you can bind multiple E1-IMA links or G.SHDSL links to an IMA group to increase the bandwidth.

When using an IMA group to transmit the ATM cells, you need to configure attributes of the IMA group.

By default, these attributes of the IMA group interface have default values. To modify the attributes, perform the following steps.

Pre-configuration Tasks

Before configuring an IMA group, complete the following task:

Register the 4E1-IMA interface card with the device or power on the AR158E, AR168F, AR168F-4P, AR158EVW, and AR208E and ensure that their self-tests are successful.

Procedure

  1. Create an IMA group.

    1. Run system-view

      The system view is displayed.

    2. Run interface ima-group interface-number

      An IMA group is created.

    3. Run quit

      Return to the system view.

  2. Add an E1-IMA or G.SHDSL interface to the IMA group.

    To add more than one E1-IMA or G.SHDSL interfaces to the IMA group, repeat the following step.

    NOTE:
    • Only non-configured E1-IMA link or G.SHDSL link can join an IMA group. Bound G.SHDSL links cannot join an IMA group.

    • When the device is connected to the DSLAM through the IMA group, the device and the DSLAM's G.SHDSL links must use the same interface numbering sequence (ascending or descending) to join or quit the IMA group. Otherwise, the IMA group may fail to be activated. To activate the IMA group, you only need to run the shutdown and undo shutdown commands in the IMA group view.

    • When removing a link from the original IMA group to a new IMA group, you need to remove two interfaces of the link from the original IMA group, and then add the two interfaces of the link to the new IMA group.

    • If two devices on both ends of a link cannot communicate after the link is removed from an original IMA group to a new IMA group, run the shutdown and undo shutdown commands in the IMA group view on the two devices.

    1. Run interface atm interface-number

      The E1-IMA interface view is displayed. Alternatively, you can run the interface atm interface-number command to enter the G.SHDSL interface view in ATM transmission mode.

    2. Run ima ima-group interface-number

      The interface is added to an IMA group.

    3. Run quit

      Return to the system view.

  3. Configure an E1-IMA or G.SHDSL interface.

    For configurations, see Configuring an E1-IMA Interface or Setting Parameters for a G.SHDSL Interface.

    To configure more than one E1-IMA or G.SHDSL interfaces, repeat the preceding step.

    The same parameters must be configured for the E1-IMA or G.SHDSL interfaces that are added to the same IMA group.

  4. Configure attributes of the IMA group.

    1. Run interface ima-group interface-number

      The IMA group view is displayed.

    2. Run ima-clock { ctc [ link-number number ] | itc }

      The clock mode of the IMA group is configured.

      By default, the clock mode of the IMA group is the common transmit clock (ctc).

    3. Run frame-length { 32 | 64 | 128 | 256 }

      The number of cells contained in an IMA frame is configured.

      By default, an IMA frame contains 128 ATM cells.

    4. Run ima-standard { normal | standard-v10 | standard-v11 | alternate-v10 }

      The standard used by an IMA group is set.

      By default, the standard used by an IMA group is set to normal.
      NOTE:
      The normal parameter has different meanings for IMA groups with different member interfaces:
      • For an IMA group with G.SHDSL member interfaces, it indicates that the standard used by the IMA group is set to V1.1 (standard implementation).
      • For an IMA group with E1-IMA member interfaces, it indicates that the IMA group automatically uses the same standard as the peer IMA group.

      If the peer IMA group uses V1.0 (other implementation), the local IMA group cannot automatically use the same standard as the peer IMA group.

    5. Run min-active-links number

      The minimum number of available member links in the IMA group is set.

      By default, the minimum number of available member links in an IMA group is 1.

    6. Run differential-delay interval

      The maximum differential delay of member links in the IMA group is set.

      By default, the maximum differential delay of member links in an IMA group is 25 ms.

Verifying the Configuration

Run the display interface ima-group [ interface-number ] command to check information about interfaces in an IMA group.

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Updated: 2019-03-06

Document ID: EDOC1100069331

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