D-Link DGS-3130 Emulator - Page 926

DGS-3130 Layer 3 Stackable Managed Switch CLI Reference Guide 94. Weighted Random Early Detection (WRED) Commands 94-1 random-detect This command is used to enable the WRED function. Use the no form of this command to disable the WRED function. random-detect COS-VALUE [profile ID] no random-detect COS-VALUE Parameters COS-VALUE profile ID Specifies the CoS queues on which the WRED state will be set. The valid range is from 0 to 7. (Optional) Specifies the WRED profile that will be applied. If not specified, the default threshold setting is used. Default By default, this option is disabled. Command Mode Interface Configuration Mode. Command Default Level Level: 12. Usage Guideline When a packet arrives, the current average queue size is calculated by hardware. avg _ Qsize  current _ Qsize  old _ avg _ Qsize  current 2 weight _ Qsize If the current average queue size is less than the minimum threshold value of the queue, the arriving packet is queued. If the current queue length is between the minimum threshold value and the maximum threshold value of the queue, the packet is either dropped or queued depending on the packet drop probability. The drop probability is calculated by the following formula. DropPr obability  avg _ Qsize  MinThreshold * MaxDropRate MaxThreshold  MinThreshold If the average queue size is greater than the maximum threshold value of the queue, all packets will be dropped. If the specified profile does not exist, then default setting of the threshold will be associated. Example This example shows how to enable the WRED function on Ethernet 1/0/1 queue 5 and apply the WRED profile 10. Switch# configure terminal Switch(config)# interface ethernet 1/0/1 Switch(config-if)# random-detect 5 profile 10 Switch(config-if)# 922