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Catalyst 3560 Switch Software Configuration Guide
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Chapter 28 Configuring QoS
Configuring Standard QoS
Classifying, Policing, and Marking Traffic by Using Policy Maps
A policy map specifies which traffic class to act on. Actions can include trusting the CoS, DSCP, or IP
precedence values in the traffic class; setting a specific DSCP or IP precedence value in the traffic class;
and specifying the traffic bandwidth limitations for each matched traffic class (policer) and the action to
take when the traffic is out of profile (marking).
A policy map also has these characteristics:
•
A policy map can contain multiple class statements, each with different match criteria and policers.
•
A separate policy-map class can exist for each type of traffic received through a port.
•
A policy-map trust state and a port trust state are mutually exclusive, and whichever is configured
last takes affect.
You can attach only one policy map per ingress port.
Beginning in privileged EXEC mode, follow these steps to create a policy map:
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
class-map [match-all | match-any]
class-map-name
Create a class map, and enter class-map configuration mode.
By default, no class maps are defined.
•
(Optional) Use the match-all keyword to perform a logical-AND
of all matching statements under this class map. All match criteria
in the class map must be matched.
•
(Optional) Use the match-any keyword to perform a logical-OR of
all matching statements under this class map. One or more match
criteria must be matched.
•
For class-map-name, specify the name of the class map.
If neither the match-all or match-any keyword is specified, the default
is match-all.
Note
Because only one match command per class map is supported,
the match-all and match-any keywords function the same.
Step 3
policy-map policy-map-name
Create a policy map by entering the policy map name, and enter
policy-map configuration mode.
By default, no policy maps are defined.
The default behavior of a policy map is to set the DSCP to 0 if the
packet is an IP packet and to set the CoS to 0 if the packet is tagged. No
policing is performed.
Step 4
class class-map-name
Define a traffic classification, and enter policy-map class configuration
mode.
By default, no policy map class-maps are defined.
If a traffic class has already been defined by using the class-map global
configuration command, specify its name for class-map-name in this
command.
