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    Configuring ATM IMA on ACX Series

    The following sections explain how to create an ATM IMA group and to configure it according to your requirements:

    Creating an IMA Group (ATM Interfaces)

    To create an IMA group, perform the following steps:

    1. In configuration mode, go to the [edit chassis] hierarchy level:
      [edit]
      user@host# edit chassis
    2. Configure the Flexible Port Concentrator (FPC) slot and the Physical Interface Card (PIC) slot as needed.
      [edit chassis]
      user@host# set fpc fpc-slot pic pic-slot
    3. Configure the device count. The device count can be set starting from 1 through 42 in the aggregated device options for inverse multiplexing for ATM at the [edit chassis fpc fpc-slot pic pic-slot] hierarchy level.
      [edit chassis fpc fpc-slot pic pic-slot]
      user@host# set aggregated-devices ima device-count count

    This results in the creation of interfaces from at-x/y/g through at-x/y/g+count–1, where the variable count is the number of interfaces and the variable g is picked from 16 onwards.

    The PIC is automatically rebooted when a configuration that changes the IMA group count is committed.

    Configuring Group ID for an IMA Link on a T1 Interface or an E1 Interface

    A group ID is assigned to all links in an IMA group.

    To assign a group ID to a T1 or an E1 interface:

    1. In configuration mode, go to the [edit interfaces interface-name] hierarchy level, where the interface name is t1-fpc/pic/port:m:n, e1-fpc/pic/port:n, or t1|e1-fpc/pic/port.
      [edit]
      user@host# edit interface interface-name
    2. Configure the encapsulation as ima.
      [edit interface interface-name]
      user@host# set encapsulation ima
    3. Configure the IMA group ID from 16 through 57. Note that this group ID is the same for all T1/E1 interfaces for a particular ATM IMA interface.
      [edit interface interface-name]
      user@host# set ima-link-options group-id number

    Implement the aforementioned procedure to apply a group ID for all applicable T1 or E1 interfaces.

    Configuring ATM Encapsulation Options

    To configure the logical link-layer encapsulation for an ATM interface to support IMA:

    1. In configuration mode, go to the [edit interfaces interface-name] hierarchy level, where the interface name is at-fpc/pic/port.
      [edit]
      user@host# edit interface interface-name
    2. Configure the logical interface (unit) as 0 and set the encapsulation for this logical interface as either ATM cell relay for CCC or ATM VC for CCC.
      [edit interface interface-name]
      user@host# set unit 0 encapsulation (atm-ccc-cell-relay | atm-ccc-vc-mux)

    Configuring IMA Group Options

    To configure the various options for an IMA group on an ATM interface:

    1. In configuration mode, go to the [edit interfaces interface-name ima-group-options] hierarchy level, where the interface name is at-fpc/pic/port.
      [edit]
      user@host# edit interface interface-name ima-group-options
    2. Configure the maximum differential delay between the links in the IMA group. You can configure the maximum differential delay from 1 millisecond through 56 milliseconds. By default, 25 milliseconds is set.
      [edit interface interface-name ima-atm-options]
      user@host# set differential-delay delay
    3. Configure the frame length of the ICP cell as 32, 64, 128, or 256. By default, 128 is set.
      [edit interface interface-name ima-atm-options]
      user@host# set frame-length length
    4. Configure the IMA group frame synchronization state parameters alpha, beta, and gamma.
      [edit interface interface-name ima-atm-options]
      user@host# set alpha number beta number gamma number

      For the default values and parameter range for alpha, beta, and gamma, see Understanding ATM IMA Configuration on ACX Series Router.

    5. Configure IMA group minimum active links. You can configure between 1 to 16 links. 1 is set by default.
      [edit interface interface-name ima-atm-options]
      user@host# set minimum-links links
    6. Configure the symmetry of the IMA group as either symmetrical configuration and operation or symmetrical configuration and asymmetrical operation.
      [edit interface interface-name ima-atm-options]
      user@host# set symmetry (symmetrical-config-and-operation | symmetrical-config-asymmetrical-operation)

      For information about symmetry, see Understanding ATM IMA Configuration on ACX Series Router.

    7. Configure a test procedure to start and end the test pattern procedure.
      [edit interface interface-name ima-atm-options]
      user@host# set ima-test-start
      user@host# ima-test-stop
      user@host# interface interface-name
      user@host# pattern number
      user@host# period number

      For information about test procedure, see Understanding ATM IMA Configuration on ACX Series Router.

    8. Configure a transmit clock to reflect the primary reference source (PRS) of the clock for each link in a group either in common timing mode or independent timing mode. By default, common timing mode is selected.
      [edit interface interface-name ima-atm-options]
      user@host# set transmit-clock (common | independent)
    9. Configure the IMA specification version as either version 1.0 or version 1.1. By default, IMA version 1.1 is selected.
      [edit interface interface-name ima-atm-options]
      user@host# set version (1.0|1.1)

    Modified: 2017-09-13