System Classes - Cisco AP775A - Nexus Converged Network Switch 5010 Configuration Manual

MQC
MQC
The Cisco Modular QoS CLI (MQC) provides a standard set of commands for configuring QoS.
You can use MQC to define additional traffic classes and to configure QoS policies for the whole system and
for individual interfaces. Configuring a QoS policy with MQC consists of the following steps:
1 Define traffic classes.
2 Associate policies and actions with each traffic class.
3 Attach policies to logical or physical interfaces as well as at the global system level.
MQC provides two command types to define traffic classes and policies:
• class-map—Defines a class map that represents a class of traffic based on packet-matching criteria.
• policy-map—Defines a policy map that represents a set of policies to be applied on a class-by-class
You define the following class-map and policy-map object types when you create them:
• network-qos—Defines MQC objects that you can use for system level related actions.
• qos—Defines MQC objects that you can use for classification.
• queuing—Defines MQC objects that you can use for queuing and scheduling.
The qos type is the default for the class-map and policy-map commands, but not for the service-policy
Note
which requires that you specify an explicit type.
You can attach policies to interfaces or EtherChannels as well as at the global system level by using the
service-policy command.
You can view all or individual values for MQC objects by using the show class-map and show policy-map
commands.
An MQC target is an entity (such as an Ethernet interface) that represents a flow of packets. A service policy
associates a policy map with an MQC target, and specifies whether to apply the policy on incoming or outgoing
packets. This mapping enables the configuration of QoS policies such as marking, bandwidth allocation,
buffer allocation, and so on.

System Classes

The system qos is a type of MQC target. You use a service-policy to associate a policy map with the system
qos target. A system qos policy applies to all interfaces on the switch unless a specific interface has an
overriding service-policy configuration. The system qos policies are used to define system classes, the classes
of traffic across the entire switch, and their attributes. To ensure QoS consistency (and for ease of configuration),
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Class maps are referenced in policy maps.
The class map classifies incoming packets based on matching criteria, such as the IEEE 802.1p CoS
value. Unicast and multicast packets are classified.
basis to class maps.
The policy map defines a set of actions to take on the associated traffic class, such as limiting the
bandwidth or dropping packets.
Information About QoS
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