OS10 Enterprise Edition User Guide Release 10.4.1.0

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Configure quality of service

Network traffic is processed based on classification and policies that are created and applied to the traffic.

QoS configuration
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 the ingress data traffic.
    • queuing —Classifies the egress queues.
    • control-plane—Classifies the control-plane traffic.
    • network-qos—Classifies the set of traffic-class IDs for ingress buffer configurations.
    • application —Classifies the application type traffic. The reserved policy-map policy-iscsi defines the actions to be performed 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
      • Enabling trust based classification
    • queuing —Defines the following actions on the egress queues classified based on queuing class-map.
      • Shaping
      • Bandwidth assignment for queues
      • Strict priority assignment for queues
      • Buffer configuration for queues
      • WRED 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.
      • Modify packet fields like CoS and DSCP.
      • Mark with a traffic class ID.
  3. Apply the policy-maps to interface (port), system (all interfaces), or control-plane traffic as follows:
    • Control-plane polices must be applied on control-plane mode.
    • The qos and network-qos policies must be applied in the input direction on physical interfaces or on system-qos mode.
    • Queuing policies must be applied in the output direction on physical interfaces or on system-qos mode.
    • Application type policy-map must be applied on system-qos mode.

    When a policy is applied on system, the policy is effective on all the ports in the system. However, interface level policy gets precedence over system level policy.


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