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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
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Chapter 33 Configuring QoS Understanding QoS
Modular QoS CLI
Modular QoS CLI (MQC) allows users to create traffic policies and attach these policies to interfaces.
A traffic policy contains a traffic class and one or more QoS features. You use a traffic class to classify
traffic, and the QoS features in the traffic policy determine how to treat the classified traffic.
Modular QoS CLI configuration includes these steps:
Step 1 Define a traffic class.
Use the class-map [match-all | match-any] class-map-name global configuration command to define a
traffic class and to enter class-map configuration mode. A traffic class contains three elements: a name,
an instruction on how to evaluate the configured match commands (if more than one match command is
configured in the class map), and a series of match commands
• You name the traffic class in the class-map command line to enter class-map configuration mode.
• You can optionally include keywords to evaluate these match commands by entering class-map
match-any or class-map match-all. If you specify match-any, the traffic being evaluated must
match one of the specified criteria. If you specify match-all, the traffic being evaluated must match
all of the specified criteria. A match-all class map can contain only one match statement, but a
match-any class map can contain multiple match statements.
Note If you do not enter match-all or match-any, the default is to match all.
• You use the match class-map configuration commands to specify criteria for classifying packets. 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. Packet s th at fail to meet any
of the matching criteria are classified as members of the default traffic class.
Step 2 Create a traffic policy to associate the traffic class with one or more QoS features.
You use the policy-map policy-map-name global configuration command to create a traffic policy and
to enter policy-map configuration mode. A traffic policy defines the QoS features to associate with the
specified traffic class. A traffic policy contains three elements: a name, a traffic class (specified with the
class policy-map configuration command), and the QoS policies configured in the class.
• You name the traffic policy in the policy-map command line to enter policy-map configuration
mode.
• In policy-map configuration mode, enter the name of the traffic class used to classify traffic to the
specified policy, and enter policy-map class configuration mode.
• In policy-map class configuration mode, you can enter the QoS features to apply to the classified
traffic. These include using the set, police, or police aggregate commands for input policy maps or
the bandwidth, priority, queue-limit or shape average commands for output policy maps.
Note A packet can match only one traffic class within a traffic policy. If a packet matches more than one traff ic
class in the traffic policy, the first traffic class defined in the policy is used. To configure more than one
match criterion for packets, you can associate multiple traffic classes with a single traffic policy.
Step 3 Attach the traffic policy to an interface.
You use the service-policy interface configuration command to attach the policy map to an interface for
packets entering or leaving the interface. You must specify whether the traffic policy characteristics
should be applied to incoming or outgoing packets. For example, entering the service-policy output