Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 739
Create a QoS Policy, Creating an Input QoS Policy
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The following example shows correct traffic classifications. DellEMC#show cam layer3-qos interface tengigabitethernet 2/4 Cam Port Dscp Proto Tcp Src Dst SrcIp DstIp DSCP Queue Index Flag Port Port Marking 20416 1 18 IP 0x0 0 0 23.64.0.5/32 0.0.0.0/0 20 2 20417 1 0 IP 0x0 0 0 23.64.0.2/32 0.0.0.0/0 10 1 20418 1 0 IP 0x0 0 0 23.64.0.3/32 0.0.0.0/0 12 1 20419 1 10 0 0x0 0 0 0.0.0.0/0 0.0.0.0/0 14 1 24511 1 0 0 0x0 0 0 0.0.0.0/0 0.0.0.0/0 - 0 Create a QoS Policy There are two types of QoS policies - input and output. Input QoS policies regulate Layer 3 and Layer 2 ingress traffic. The regulation mechanisms for input QoS policies are rate policing and setting priority values. • Layer 3 - QoS input policies allow you to rate police and set a DSCP or dot1p value. In addition, you can configure a drop precedence for incoming packets based on their DSCP value by using a DSCP color map. For more information, see DSCP Color Maps. • Layer 2 - QoS input policies allow you to rate police and set a dot1p value. Output QoS policies regulate egress traffic. The regulation mechanisms for output QoS policies are bandwidth percentage, scheduler strict, rate shaping and WRED. NOTE: When changing a "service-queue" configuration in a QoS policy map, all QoS rules are deleted and re-added automatically to ensure that the order of the rules is maintained. As a result, the Matched Packets value shown in the show qos statistics command is reset. NOTE: To avoid issues misconfiguration causes, Dell EMC Networking recommends configuring either DCBX or Egress QoS features, but not both simultaneously. If you enable both DCBX and Egress QoS at the same time, the DCBX configuration is applied and unexpected behavior occurs on the Egress QoS. Creating an Input QoS Policy To create an input QoS policy, use the following steps. 1 Create a Layer 3 input QoS policy. CONFIGURATION mode qos-policy-input Create a Layer 2 input QoS policy by specifying the keyword layer2 after the qos-policy-input command. 2 After you create an input QoS policy, do one or more of the following: Configuring Policy-Based Rate Policing Setting a dot1p Value for Egress Packets Configuring Policy-Based Rate Policing To configure policy-based rate policing, use the following command. • Configure rate police ingress traffic. QOS-POLICY-IN mode rate-police Quality of Service (QoS) 739
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