Lantronix SISPM1040-3166-L Web User Guide Rev G PDF 14.13 MB - Page 172

Transition Networks SISPM1040-3xxx-L Web User Guide DPL : The Drop Precedence Level for which the configuration below applies. Enable : Controls whether RED is enabled for this entry. Min : Controls the lower RED fill level threshold. If the queue filling level is below this threshold, the drop probability is zero. This value is restricted to 0-100%. Max : Controls the upper RED drop probability or fill level threshold for frames marked with Drop Precedence Level > 0 (yellow frames). This value is restricted to 1-100%. Max Unit : Selects the unit for Max. Possible values are: Drop Probability: Max controls the drop probability just below the 100% fill level. Fill Level: Max controls the fill level where drop probability reaches 100%. RED Drop Probability Function The figure below shows the drop probability versus fill level function with associated parameters. Min is the fill level where the queue randomly start dropping frames marked with Drop Precedence Level > 0 (yellow frames). If Max Unit is 'Drop Probability' (the green line), Max controls the drop probability when the fill level is just below 100%. If Max Unit is 'Fill Level' (the red line), Max controls the fill level where drop probability reaches 100%. This configuration makes it possible to reserve a portion of the queue exclusively for frames marked with Drop Precedence Level 0 (green frames). The reserved portion is calculated as (100 - Max) %. Frames marked with Drop Precedence Level 0 (green frames) are never dropped. The drop probability for frames increases linearly from zero (at Min average queue filling level) to Max Drop Probability or Fill Level. 33763 Rev. G https://www.transition.com Page 172 of 496