Problems With Classic RED
According to Van Jacobson, "there are not one, but two bugs in classic RED." Improvements to the algorithm were developed, and a draft paper was prepared, but the paper was never published, and the improvements were not widely disseminated or implemented. There has been some work in trying to finish off the research and fix the bugs.
Pure RED does not accommodate quality of service (QoS) differentiation. Weighted RED (WRED) and RED with In and Out (RIO) provide early detection with QoS considerations.
Read more about this topic: Random Early Detection
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