Dell N3200-ON EMC Networking N-Series Switches CLI Reference Guide version 6.7 - Page 787

Queue ID WRED Minimum Threshold 0 40/30/20/100 1 40/30/20/100 2 40/30/20/100 3 40/30/20/100 4 40/30/20/100 5 40/30/20/100 6 40/30/20/100 WRED Maximum Threshold 100/ 90/ 80/100 100/ 90/ 80/100 100/ 90/ 80/100 100/ 90/ 80/100 100/ 90/ 80/100 100/ 90/ 80/100 100/ 90/ 80/100 WRED Drop ECN Enabled Probability Scale 10/ 10/ 10/ 10 No 10/ 10/ 10/ 10 No 10/ 10/ 10/ 10 No 10/ 10/ 10/ 10 No 10/ 10/ 10/ 10 No 10/ 10/ 10/ 10 No 10/ 10/ 10/ 10 No Command Mode Global Configuration mode, Interface Configuration mode (Ethernet and port-channel), Interface Range mode User Guidelines Interface configuration overrides the global configuration. WRED Processing WRED is intended to provide feedback to protocols (e.g. TCP) that depend on packet loss to adjust their transmission rate. WRED drop behavior only occurs when an interface is congested within the ranges specified. If congestion exceeds the upper limit, queued packets will be dropped at the rate of traffic ingressing the system, e.g. 100%. If the congestion is less than the lower limit, no packets will be dropped. Traffic ingressing the switch can be assigned to one of four drop precedences based on a set of matching criteria. There are 3 drop precedences for TCP traffic (green, yellow, and red) and one drop precedence for non-TCP traffic (all colors). Users may configure the congestion thresholds at which packets experiencing congestion are dropped randomly for each drop precedence and may also configure the probability of a packet being dropped. Packets are dropped at 100% when the egress queue size exceeds the maximum value and at 0% when the queue size is below the minimum value. Layer 2 Switching Commands 787