Dell SmartFabric OS10 User Guide Release 10.5.3

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.