Cisco 10000 Series User Manual

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Cisco 10000 Series Router Quality of Service Configuration Guide
OL-7433-09
Chapter 2 Classifying Traffic
Restrictions and Limitations for Traffic Classification
match qos-group
• Use this command to identify a specific QoS group number marking on a packet. You can also use
this command to convey the received MPLS experimental (EXP) field value to the output interface.
• The router only uses the QoS group number as an identifying mark. The QoS group numbers have
no mathematical significance. For example, qos-group 2 is not greater than 1. The value simply
indicates that a packet marked with qos-group 2 is different than a packet marked with qos-group 1.
You define the treatment of these packets by defining QoS policies in a policy map.
• The QoS group number is local to the router. The QoS group number that is marked on a packet does
not leave the router when the packet leaves the router. To mark the packet with a value that resides
in the packet, use an IP precedence setting, an IP DSCP setting, or another method of packet
marking.
match vlan
• Do not use this command with any other match command in a class map.
Class-Default Class
The class named class-default is a predefined traffic class that the router uses to classify traffic that does
match one of the defined classes in a policy map. Although class-default is predefined, you can configure
policy actions for it in the policy map. If you do not configure policy actions, by default the router
classifies class-default traffic as first in, first out (FIFO) and gives the traffic best-effort treatment.
For more information on policy actions, see Chapter 3, “Configuring QoS Policy Actions and Rules.”
Restrictions and Limitations for Traffic Classification
• Each class map can have a maximum of 16 match statements.
• The Cisco 10000 series router does not have a predefined scaling limit for classification.
• A policy map with a traffic class based on the match fr-de command can be applied only on an
inbound Frame Relay interface.
Classifying Traffic Using a Class Map
To classify traffic using a class map, perform the following tasks:
• Creating a Class Map, page 2-12 (required)
• Verifying Traffic Classification, page 2-13 (optional)
• Defining QoS Policy Actions, page 2-13 (required)
(See Chapter 3, “Configuring QoS Policy Actions and Rules.”)

Cisco 10000 Series Specifications

General

Brand	Cisco
Model	10000 Series
Category	Network Router
Language	English