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Dell EMC SmartFabric OS10 User Guide Release 10.5.0

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Configure quality of service

Network traffic processes based on classification and policies that apply to the traffic.

Configure quality of service
Configuring QoS is a three-step process:
  1. Create class-maps to classify the traffic flows. The following are the different types of class-maps:
    • qos (default)—Classifies ingress data traffic.
    • queuing —Classifies egress queues.
    • control-plane—Classifies control-plane traffic.
    • network-qos—Classifies traffic-class IDs for ingress buffer configurations.
    • application —Classifies application-type traffic. The reserved policy-map policy-iscsi defines the actions for class-iscsi traffic.
  2. Create policy-maps to define the policies for the classified traffic flows. The following are the different types of policy-maps:
    • qos (default)—Defines the following actions on the traffic classified based on qos class-map:
      • Policing
      • Marking with a traffic class ID
      • Modifying packet fields such as CoS and DSCP
    • queuing —Defines the following actions on the egress queues classified based on queuing class-map:
      • Shaping
      • Assigning bandwidth for queues
      • Assigning strict priority for queues
      • Buffering configuration for queues
      • Weighted random early detection (WRED)/Explicit congestion notification (ECN) configuration on queues
    • control-plane—Defines the policing of control queues for rate-limiting the control-plane traffic on CPU queues.
    • network-qos—Defines the Ingress buffer configuration for selected traffic-classes matched based on network-qos class-map.
    • application —Defines the following actions for the application classified traffic:
      • Modifying packet fields such as CoS and DSCP.
      • Marking traffic class IDs.
  3. Apply the policy-maps to the port interface, system for all interfaces, or control-plane traffic as follows:
    • Apply control-plane polices in Control-Plane mode.
    • Apply QoS and network-QoS policies in the input direction on physical interfaces or in System-QoS mode.
    • Apply queuing policies in the output direction on physical interfaces or in System-QoS mode.
    • Apply an application type policy-map in System-QoS mode.

    When you apply a policy at the system level (System-QoS mode), the policy is effective on all the ports in the system. However, the interface-level policy takes precedence over the system-level policy.

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