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Configuring Static Shaping Parameters to Account for Overhead in Downstream Traffic Rates

The overhead accounting feature enables you to account for downstream traffic that has different encapsulations or downstream traffic from cell-based equipment, such as ATM switches.

You can configure the overhead accounting feature to shape downstream traffic based on frames or cell shaping mode.

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

To configure the shaping mode and byte adjustment value for static CoS configurations:

  1. Specify the shaping mode.

    Frame shaping mode is enabled by default.

    [edit dynamic-profiles profile-name class-of-service traffic-control-profiles profile-name]user@host#set overhead-accounting (frame-mode | cell-mode)
  2. (Optional) Specify a byte adjustment value.
    [edit dynamic-profiles profile-name class-of-service traffic-control-profiles profile-nameuser@host#set overhead-accounting bytes byte-value]

    Best Practice: We recommend that you specify a byte adjustment value that represents the difference between the customer premise equipment (CPE) protocol overhead and the 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.


Published: 2010-04-14

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