D-Link DGS-1520 User Manual - Page 377

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Web UI Reference Guide 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 7-27 WRED Queue Window The fields that can be configured are described below: Parameter Unit From Port - To Port CoS WRED State Profile Weight 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. Select to enable or disable the WRED feature state on the specified port(s) here. Enter the WRED profile ID here. The range is from 1 to 32. Enter the exponential weight value here. The range is from 0 to 15. This feature is used to configure the WRED exponential weight factor for the average queue size calculation for the queue. Click the Apply button to accept the changes made. 367