D-Link DGS-3630 User Manual 1 - Page 459

DGS-3630 Series Layer 3 Stackable Managed Switch Web UI Reference Guide 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 7-27 WRED Profile Window The fields that can be configured are described below: Parameter Profile Packet Type Description Enter the WRED profile ID here. The range is from 1 to 128. Select the packet type here. Options to choose from are TCP and Non-TCP. • TCP - Specifies the WRED drop parameters for the TCP packets to be set. • Non-TCP - Specifies the WRED drop parameters for non-TCP packets to be set. Packet Colour Select the packet color here. Options to choose from are Green, Yellow, and Red. • Green - Specifies the WRED drop parameters for green packets to be set. • Yellow - Specifies the WRED drop parameters for yellow packets to be set. • Red - Specifies the WRED drop parameters for red packets to be set. 447