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FTOS Configuration Guide for the C-Series - Force10 Networks

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Specify WRED drop precedence<br />

Specify WRED drop precedence is supported only on plat<strong>for</strong>m e<br />

Specify a WRED profile to yellow and/or green traffic using <strong>the</strong> command wred from QOS-POLICY-OUT<br />

mode. See Apply a WRED profile to traffic on page 575.<br />

Create Policy Maps<br />

There are two types of policy maps: input and output.<br />

Create Input Policy Maps<br />

Layer 3 input policy maps are supported on plat<strong>for</strong>ms: c e s<br />

Layer 2 input policy maps are supported only on plat<strong>for</strong>m e<br />

There are two types of input policy-maps: Layer 3 and Layer 2.<br />

1. Create a Layer 3 input policy map using <strong>the</strong> command policy-map-input from CONFIGURATION<br />

mode. Create a Layer 2 input policy map by specifying <strong>the</strong> keyword layer2 with <strong>the</strong> policy-map-input<br />

command.<br />

2. Once you create an input policy map, do one or more of <strong>the</strong> following:<br />

• Apply a class-map or input QoS policy to a queue<br />

• Apply an input QoS policy to an input policy map<br />

• Honor DSCP values on ingress packets<br />

• Honoring dot1p values on ingress packets<br />

3. Apply <strong>the</strong> input policy map to an interface. See page 572.<br />

Apply a class-map or input QoS policy to a queue<br />

Assign an input QoS policy to a queue using <strong>the</strong> command service-queue from POLICY-MAP-IN mode.<br />

Apply an input QoS policy to an input policy map<br />

Apply an input QoS policy to an input policy map using <strong>the</strong> command policy-aggregate from<br />

POLICY-MAP-IN mode.<br />

Honor DSCP values on ingress packets<br />

<strong>FTOS</strong> provides <strong>the</strong> ability to honor DSCP values on ingress packets using Trust DSCP feature. Enable this<br />

feature using <strong>the</strong> command trust diffserv from POLICY-MAP-IN mode. Table 55 lists <strong>the</strong> standard DSCP<br />

definitions, and indicates to which queues <strong>FTOS</strong> maps DSCP values. When Trust DSCP is configured <strong>the</strong><br />

matched packets and matched bytes counters are not incremented in show qos statistics.<br />

<strong>FTOS</strong> <strong>Configuration</strong> <strong>Guide</strong>, version 7.7.1.0 571

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