Dell PowerSwitch S4820T 9.50.1 Configuration Guide for the S4820T System - Page 744
Create a QoS Policy, Creating an Input QoS Policy
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20416 1 18 IP 0x0 0 0 23.64.0.5/32 0.0.0.0/0 20 2 20417 1 18 IP 0x0 0 0 0.0.0.0/0 0.0.0.0/0 - 0 20418 1 0 IP 0x0 0 0 23.64.0.2/32 0.0.0.0/0 10 1 20419 1 0 IP 0x0 0 0 0.0.0.0/0 0.0.0.0/0 - 0 20420 1 0 IP 0x0 0 0 23.64.0.3/32 0.0.0.0/0 12 1 20421 1 0 IP 0x0 0 0 0.0.0.0/0 0.0.0.0/0 - 0 20422 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 In the previous example, the ClassAF1 does not classify traffic as intended. Traffic matching the first match criteria is classified to Queue 1, but all other traffic is classified to Queue 0 as a result of CAM entry 20419. When you remove the explicit "deny any" rule from all three ACLs, the CAM reflects exactly the desired classification. The following example shows correct traffic classifications. Dell#show cam layer3-qos interface tengigabitethernet 2/49 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 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. 744 Quality of Service (QoS)
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