Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 427
Create Policy Maps
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Configure Policy-Based Rate Shaping To rate shape egress traffic, use the rate-shape command from QOS-POLICY-OUT mode. Allocate Bandwidth to the Queue To allocate bandwidth, use the bandwidth-percentage command in QOS-POLICY-OUT mode. FTOS recommends that you pre-calculate your bandwidth requirements before creating them. Make sure you apply the QoS policy to all the four queues and that the sum of the bandwidths allocated through them is exactly 100. When you apply the QoS policies through output policy map and if the sum of the bandwidth percentages configured is below or above 100, then the actual bandwidth is allocated proportionally. If the sum of allocated bandwidth is less than 100, the unused bandwidth is allotted to un-allocated queues. If the sums of allocated bandwidth exceed 100, then 1% of the bandwidth is derived for unassigned queues from assigned queues. Configure a Scheduler to Queue By default, the MXL Switch schedules packets for egress based on weighted round robin (WRR). Note that the bandwidth and scheduler cannot be configured at the same time. Policy-level scheduler assigned to queue is applied to both unicast and multicast traffic. Specify WRED Drop Precedence To specify a WRED profile to yellow and/or green traffic, use the wred command from QOS-POLICY-OUT mode. For more information, refer to Apply a WRED Profile to Traffic. 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. To create a Layer 3 input policy map, use the policy-map-input command from CONFIGURATION mode. 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: • 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 • Fall Back to trust diffserve or dot1p Quality of Service (QoS) | 425
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