Dell PowerSwitch S4820T 9.50.1 Configuration Guide for the S4820T System - Page 746

Allocating Bandwidth to Queue Schedule packets for egress based on Deficit Round Robin (DRR). These strategies both offer a guaranteed data rate. The following table lists the default bandwidth weights for each queue, and their equivalent percentage which is derived by dividing the bandwidth weight by the sum of all queue weights. Table 56. Default Bandwidth Weights Queue Default Weight Equivalent Percentage 0 1 6.67% 1 2 13.33% 2 4 26.67% 3 8 53.33% • Allocate bandwidth to queues. bandwidth-percentage Specifying WRED Drop Precedence Specifying WRED drop precedence is supported on the S4820T platform. • Specify a WRED profile to yellow and/or green traffic. QOS-POLICY-OUT mode wred For more information, refer to Applying a WRED Profile to Traffic. Create Policy Maps There are two types of policy maps: input and output. Creating Input Policy Maps There are two types of input policy-maps: Layer 3 and Layer 2. 1. Create a Layer 3 input policy map. CONFIGURATION mode policy-map-input Create a Layer 2 input policy map by specifying the keyword layer2 with the policy-map-input command. 2. After you create an input policy map, do one or more of the following: Applying a Class-Map or Input QoS Policy to a Queue Applying an Input QoS Policy to an Input Policy Map Honoring DSCP Values on Ingress Packets Honoring dot1p Values on Ingress Packets 3. Apply the input policy map to an interface. 746 Quality of Service (QoS)