Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 852

Allocating Bandwidth to Queue The switch schedules packets for egress based on Deficit Round Robin (DRR). This strategy offers a guaranteed data rate. Allocate bandwidth to queues only in terms of percentage in 4-queue and 8-queue systems. The following table shows the default bandwidth percentage for each queue. Table 72. Default Bandwidth Weights Queue Default Bandwidth Percentage for Default Bandwidth Percentage for 4-Queue System 8-Queue System 0 6.67% 1% 1 13.33% 2% 2 26.67% 3% 3 53.33% 4% 4 - 5% 5 - 10% 6 - 25% 7 - 50% When you assign a percentage to one queue, note that this change also affects the amount of bandwidth that is allocated to other queues. Therefore, whenever you are allocating bandwidth to one queue, Dell Networking recommends evaluating your bandwidth requirements for all other queues as well. • Allocate bandwidth to queues. bandwidth-percentage Assign each queue a bandwidth percentage ranging from 1 to 100%, in increments of 1%. Specifying WRED Drop Precedence You can configure the WRED drop precedence in an output QoS policy. • 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 852 Quality of Service (QoS)