Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 860

WRED uses a profile to specify minimum and maximum threshold values. The minimum threshold is the allotted buffer space for specified traffic, for example, 1000KB on egress. If the 1000KB is consumed, packets are dropped randomly at an exponential rate until the maximum threshold is reached (as shown in the following illustration); this procedure is the "early detection" part of WRED. If the maximum threshold, for example, 2000KB, is reached, all incoming packets are dropped until the buffer space consumes less than 2000KB of the specified traffic. Figure 113. Packet Drop Rate for WRED You can create a custom WRED profile or use one of the five pre-defined profiles. Table 75. Pre-Defined WRED Profiles Wred-profile-name wred_drop min-threshold 0 wred_teng_y 594 wred_teng_g 594 wred_fortyg_y 594 wred_fortyg_g 594 wred_oneg_y_pe 154 wred_oneg_g_pe 154 wred_teng_y_pe 154 wred_teng_g_pe 154 max-threshold 0 5941 5941 5941 5941 1538 1538 1538 1538 max-drop-rate 100 100 50 50 25 100 50 50 25 860 Quality of Service (QoS)