D-Link DGS-3630 User Manual 1 - Page 460

DGS-3630 Series Layer 3 Stackable Managed Switch Web UI Reference Guide Parameter Min Threshold Max Threshold Max Drop Rate Description Enter the minimum threshold value here that will be used to start WRED dropping. The range is from 0 to 100. Enter the maximum threshold value here over which WRED will drop all packets destined for this queue. The range is from 0 to 100. Enter the maximum drop-rate value here. The range is from 0 to 14. This feature specifies the drop probability when the average queue size reaches the maximum threshold. When this value is zero, then the packet will not be dropped or remarked for ECN. Click the Apply button to accept the changes made. Click the Find button to locate a specific entry based on the information entered. Click the Reset Configuration button to reset the configuration on the specified entry. WRED Queue This window is used to display and configure the WRED queue settings. WRED drops packets, based on the average queue size exceeding a specific threshold, to indicate congestion. Explicit Congestion Notification (ECN) is an extension to WRED in that ECN marks packets instead of dropping them when the average queue size exceeds a specific threshold value. When configuring the WRED ECN feature, routers and end hosts would use this marking as a signal that the network is congested and slow down sending packets. To view the following window, click QoS > WRED > WRED Queue, as shown below: Figure 7-28 WRED Queue Window The fields that can be configured are described below: Parameter Unit From Port - To Port CoS Description Select the Switch unit ID that will be used here. Select the Switch port range that will be used here. Select the CoS value here. The range is from 0 to 7. 448