Reference Guide

Conguring QoS is a three-step process:
1 Create class-maps to classify the trac ows. The following are the dierent types of class-maps:
• qos (default)—Classies the ingress data trac.
• queuing —Classies the egress queues.
• control-plane—Classies the control-plane trac.
• network-qos—Classies the set of trac-class IDs for ingress buer congurations.
• application —Classies the application type trac. The reserved policy-map policy-iscsi denes the actions to be performed for
class-iscsi trac.
2 Create policy-maps to dene the policies for the classied trac ows. The following are the dierent types of policy-maps:
• qos (default)—Denes the following actions on the trac classied based on qos class-map.
– Policing
– Marking with a trac class ID
– Modifying packet elds such as CoS and DSCP
– Enabling trust based classication
• queuing —Denes the following actions on the egress queues classied based on queuing class-map.
– Shaping
– Bandwidth assignment for queues
– Strict priority assignment for queues
– Buer conguration for queues
– WRED conguration on queues
• control-plane—Denes the policing of control queues for rate-limiting the control-plane trac on CPU queues.
• network-qos—Denes the Ingress buer conguration for selected trac-classes matched based on network-qos class-map.
• application —Denes the following actions for the application classied trac.
– Modify packet elds like CoS and DSCP.
– Mark with a trac class ID.
3 Apply the policy-maps to interface (port), system (all interfaces), or control-plane trac 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.
Quality of service
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