Dell Force10 S25N-S50N FTOS Configuration Guide FTOS 8.4.2.7 E-Series TeraScal - Page 864

www.dell.com | support.dell.com Table 41-4 shows an example of choosing bandwidth weights for all four queues to achieve a target bandwidth allocation. Table 41-4. Assigning Bandwidth Weights for the C-Series and S-Series Queue 0 1 2 3 Weight 1 64 128 32 Equivalent Percentage 0.44% 28.44% 56.89% 14.22% Target Allocation 1% 25% 60% 14% Specify WRED drop precedence e Specify WRED drop precedence is supported only on platform Specify a WRED profile to yellow and/or green traffic using the command wred from QOS-POLICY-OUT mode. See Apply a WRED profile to traffic on page 871. Create Policy Maps There are two types of policy maps: input and output. Create Input Policy Maps There are two types of input policy-maps: Layer 3 and Layer 2. 1. Create a Layer 3 input policy map using the command policy-map-input from CONFIGURATION mode. Create a Layer 2 input policy map by specifying the keyword layer2 with the policy-map-input command. 2. Once you create an input policy map, do one or more of the following: • Apply a class-map or input QoS policy to a queue • Apply an input QoS policy to an input policy map • Honor DSCP values on ingress packets • Honoring dot1p values on ingress packets 3. Apply the input policy map to an interface. See page 868. FTOS Behavior: On ExaScale, FTOS cannot classify protocol traffic on a Layer 2 interface using Layer 3 policy map. The packets always take the default queue, Queue 0, and cannot be rate-policed. Apply a class-map or input QoS policy to a queue Assign an input QoS policy to a queue using the command service-queue from POLICY-MAP-IN mode. 864 | Quality of Service