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FTOS Configuration Guide for the C-Series - Force10 Networks

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Set a DSCP value <strong>for</strong> egress packets<br />

Set a DSCP value <strong>for</strong> egress packets based on ingress QoS classification, as shown in Figure 394. The 6<br />

bits that are used <strong>for</strong> DSCP are also used to identify <strong>the</strong> queue in which traffic is buffered. When you set a<br />

DSCP value, <strong>FTOS</strong> displays an in<strong>for</strong>mational message advising you of <strong>the</strong> queue to which you should<br />

apply <strong>the</strong> QoS policy (using <strong>the</strong> command service-queue from POLICY-MAP-IN mode). If you apply <strong>the</strong><br />

QoS policy to a queue o<strong>the</strong>r than <strong>the</strong> one specified in <strong>the</strong> in<strong>for</strong>mational message, <strong>FTOS</strong> replaces <strong>the</strong> first 3<br />

bits in <strong>the</strong> DSCP field with <strong>the</strong> queue ID you specified.<br />

Figure 404 Marking DSCP Values <strong>for</strong> Egress Packets<br />

<strong>Force10</strong>#config<br />

<strong>Force10</strong>(conf)#qos-policy-input my-input-qos-policy<br />

<strong>Force10</strong>(conf-qos-policy-in)#set ip-dscp 34<br />

% Info: To set <strong>the</strong> specified DSCP value 34 (100-010 b) <strong>the</strong> QoS policy must be mapped to queue<br />

4 (100 b).<br />

<strong>Force10</strong>(conf-qos-policy-in)#show config<br />

!<br />

qos-policy-input my-input-qos-policy<br />

set ip-dscp 34<br />

<strong>Force10</strong>(conf-qos-policy-in)#end<br />

<strong>Force10</strong>#<br />

Set a dot1p value <strong>for</strong> egress packets<br />

Set a dot1p value <strong>for</strong> egress packets is supported only on plat<strong>for</strong>m e<br />

Set a dot1p value <strong>for</strong> egress packets using <strong>the</strong> command set mac-dot1p from QOS-POLICY-IN mode.<br />

Create an output QoS policy<br />

To create an output QoS policy:<br />

1. Create an output QoS policy using <strong>the</strong> command qos-policy-output from CONFIGURATION mode.<br />

2. Once you configure an output QoS policy, do one or more of <strong>the</strong> following<br />

• Configure policy-based rate limiting<br />

• Configure policy-based rate shaping<br />

• Allocate bandwidth to queue<br />

• Specify WRED drop precedence<br />

Configure policy-based rate limiting<br />

Configure policy-based rate limiting is supported only on plat<strong>for</strong>m e<br />

Policy-based rate limiting is configured <strong>the</strong> same way as port-based rate limiting except that <strong>the</strong> command<br />

from QOS-POLICY-OUT mode is rate-limit ra<strong>the</strong>r than rate limit as it is in INTERFACE mode.<br />

<strong>FTOS</strong> <strong>Configuration</strong> <strong>Guide</strong>, version 7.7.1.0 569

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