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Broadband Subscriber Services User Guide
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Configuring Dynamic Shaping Parameters to Account for Overhead in Downstream Traffic Rates

date_range 06-Dec-23

You can configure the overhead accounting feature to shape downstream traffic based on either frames or cells.

You can also account for the different byte sizes per encapsulation by configuring a byte adjustment value for the shaping mode.

This feature is supported on MPCs on MX Series routers.

To configure the overhead accounting feature in a dynamic profile:

  1. Do one of the following to configure the shaping mode:
    • Specify the shaping mode.

      Frame shaping mode is enabled by default.

      content_copy zoom_out_map
      [edit dynamic-profiles profile-name class-of-service traffic-control-profiles profile-name
      user@host#set overhead-accounting (frame-mode | cell-mode)
      
    • Configure a variable for the shaping mode.

      content_copy zoom_out_map
      [edit dynamic-profiles profile-name class-of-service traffic-control-profiles profile-name
      user@host#set overhead-accounting $junos-cos-shaping-mode
      
  2. (Optional) Do one of the following to configure the byte adjustment value:
    • Specify a byte adjustment value.

      content_copy zoom_out_map
      [edit dynamic-profiles profile-name class-of-service traffic-control-profiles profile-name
      user@host#set overhead-accounting bytes byte-value
      
    • Configure a variable for the byte adjustment.

      content_copy zoom_out_map
      [edit dynamic-profiles profile-name class-of-service traffic-control-profiles profile-name
      user@host#set overhead-accounting bytes $junos-cos-byte-adjust
      
      Best Practice:

      We recommend that you specify a byte adjustment value that represents the difference between the customer premise equipment (CPE) protocol overhead and B-RAS protocol overhead.

      The available range is –120 through 124 bytes. The system rounds up the byte adjustment value to the nearest multiple of 4. For example, a value of 6 is rounded to 8, and a value of -10 is rounded to -8.

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