D-Link DXS-3610 User Manual - Page 452

DXS-3610 Series Layer 3 Stackable 10GbE Managed Switch Web UI Reference Guide WRED Weighted Random Early Detection (WRED) is another implementation for QoS that will help the overall throughput for your QoS queues. Based on the egress queue of the QoS function set on the Switch, this method will analyze these packets and their QoS queue to determine if there will be an overflow of packets entering the QoS queues and consequentially, minimize the packet flow into these queues by dropping random packets. WRED employs two methods of avoiding congestion within the QoS queue.  Every QoS queue has a minimum and a maximum level for acceptance of packets. Once the maximum threshold has been reached for this queue, the Switch will begin discarding all ingress packets, this minimizing the allotted bandwidth for QoS. When below the minimum threshold, the Switch will accept all ingress packets.  When the ingress packets are somewhere between the maximum and minimum queue, the Switch will use a slope probability function to determine a random method of dropping packets based on the maximum drop rate which specifies the drop probability when the queues reach maximum threshold. If queues are closer to the maximum threshold, the Switch will increase the discarding of random packets to even out the flow to the queues and avoid overflows to higher priority queues. WRED Profile This window is used to display and configure the Weighted Random Early Detection (WRED) profile settings. To view the following window, click QoS > WRED > WRED Profile, as shown below: Figure 7-26 WRED Profile Window The fields that can be configured are described below: Parameter Profile Description Enter the WRED profile ID here. The range is from 1 to 128. 441