Cisco Systems A9014CFD Using Class Maps to Define a Traffic Class, Class-map match-all match-any

Chapter 24 Configuring QoS

Configuring Quality of Service (QoS)

This example shows how to create an ACL that permits IP traffic from a source host at 10.1.1.1 to a destination host at 10.1.1.2:

Router(config)# access-list 100 permit ip host 10.1.1.1 host 10.1.1.2

Using Class Maps to Define a Traffic Class

You use the class-mapglobal configuration command to name and to isolate a specific traffic flow (or class) from all other traffic. A class map defines the criteria to use to match against a specific traffic flow to further classify it. Match statements can include criteria such as CoS value, DSCP value, IP precedence values, or QoS group values, or VLAN IDs. You define match criterion with one or more match statements entered in the class-map configuration mode.

Follow these guidelines when configuring class maps:

•A match-allclass map cannot have more than one classification criterion (one match statement), but a match-anyclass map can contain multiple match statements.

•The match cos and match vlan commands are supported only on Layer 2 802.1Q trunk ports.

•You use a class map with the match vlan command in the parent policy in input hierarchical policy maps for per-port, per-VLAN QoS on trunk ports. A policy is considered a parent policy map when it has one or more of its classes associated with a child policy map. Each class within a parent policy map is called a parent class. You can configure only the match vlan command in parent classes. You cannot configure the match vlan command in classes within the child policy map.

•You cannot configure match qos-groupfor an input policy map.

•In an output policy map, no two class maps can have the same classification criteria; that is, the same match qualifiers and values.

•The maximum number of class maps supported on the Cisco ASR 901 router is 256.

Complete the following steps to create a class map and to define the match criterion to classify traffic:

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	class-map [match-all match-any]	Create a class map, and enter class-map configuration mode. By default, no
	class-map-name	class maps are defined.
		• (Optional) Use the match-allkeyword 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-anykeyword 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 no matching statements are specified, the default is match-all.
		Note A match-allclass map cannot have more than one classification
		criterion (match statement).

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
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