Use the MQC to enable packet classification and marking based on the QoS group value. The MQC is a CLI that allows you to
create traffic classes and policies, enable a QoS feature (such as packet classification), and attach these policies to interfaces.
In the MQC, the
class-map command is used to define a traffic class that is used to classify traffic (which is then associated with a traffic policy).
The MQC consists of the following three processes:
-
Defining a traffic class using the
class-map command.
-
Creating a traffic policy by associating the traffic class with one or more QoS features (using the
policy-map command).
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Attaching the traffic policy to the interface using the
service-policy command.
A traffic class contains three major elements: a name, one or more
match commands, and, if more than one
match command exists in the traffic class, an instruction on how to evaluate these
match commands. The traffic class is named in the
class-map command line; for example, if you enter the
class-mapcisco command while configuring the traffic class in the CLI, the traffic class would be named “cisco.”
The
match commands are used to specify various criteria for classifying packets. Packets are checked to determine whether they match
the criteria specified in the
match commands. If a packet matches the specified criteria, that packet is considered a member of the class and is forwarded according
to the QoS specifications set in the traffic policy. Packets that fail to meet any of the matching criteria are classified
as members of the default traffic class.
A policy map also contains three major elements: a name, a traffic class to associate with one or more QoS features, and
any individual
set commands you want to use to mark the network traffic.
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