-
Cisco IOS Quality of Service Solutions Configuration Guide, Release 12.2
-
About Cisco IOS Software Documentation
-
Using Cisco IOS Software
-
Quality of Service Overview
- Part 1: Classification
- Part 2: Congestion Management
- Part 3: Congestion Avoidance
- Part 4: Policing and Shaping
- Part 5: Signalling
- Part 6: Link Efficiency Mechanisms
- Part 7: Quality of Service Solutions
- Part 8: Modular Quality of Service Command-Line Interface
- Part 9: Security Device Manager
-
Index
-
Feedback
Table Of Contents
Configuring Class-Based Packet Marking
Class-Based Packet Marking Configuration Task List
Configuring an IP Precedence Value
Configuring a Class of Service Value
Changing an ATM Cell Loss Priority Bit Setting
Verifying the Class-Based Packet Marking Feature
Class-Based Packet Marking Configuration Examples
Configuring an IP Precedence Value Example
Configuring an IP DSCP Value Example
Configuring a QoS Group Value Example
Configuring a Classifying CoS Values Example
Changing the ATM CLP Value Example
Configuring Class-Based Packet Marking
This chapter describes the tasks for configuring the Class-Based Packet Marking feature.
For complete conceptual information, see the section "Class-Based Packet Marking" in the "Classification Overview" chapter in this book.
For a complete description of the Class-Based Packet Marking commands in this chapter, refer to the Cisco IOS Quality of Service Solutions Command Reference. To locate documentation of other commands that appear in this chapter, use the command reference master index or search online.
To identify the hardware platform or software image information associated with a feature, use the Feature Navigator on Cisco.com to search for information about the feature or refer to the software release notes for a specific release. For more information, see the "Identifying Supported Platforms" section in the "Using Cisco IOS Software" chapter in this book.
Class-Based Packet Marking Configuration Task List
To configure the Class-Based Packet Marking feature, perform the tasks described in the following sections. Although all of the tasks in the sections are optional, you must either configure an IP Precedence value or an IP differentiated services code point (DSCP) value (the tasks in the first or second section).
•
Configuring an IP Precedence Value (Optional)
•
•
•
•
•
This task list includes the instructions for configuring either an IP Precedence value or an IP DSCP value. However, other match criteria can be used used as well. For information about other match criteria, see the section "Creating a Traffic Class" in the chapter "Configuring the Modular Quality of Service Command-Line Interface" in this book.
See the end of this chapter for the section "Class-Based Packet Marking Configuration Examples."
Configuring an IP Precedence Value
To mark a packet by setting the IP Precedence bits in the ToS byte, use the following commands beginning in global configuration mode:
The service policy configured in this section is not yet attached to an interface. For information on attaching a service policy to an interface, see the chapter "Modular Quality of Service Command-Line Interface Overview" in this book.
Configuring an IP DSCP Value
To mark a packet by setting the IP DSCP value, use the following commands beginning in global configuration mode:
The service policy configured in this section is not yet attached to an interface. For information on attaching a service policy to an interface, see the chapter "Modular Quality of Service Command-Line Interface Overview" in this book.
Configuring a QoS Group Value
To associate a local QoS group value with a packet, use the following commands beginning in global configuration mode:
The service policy configured in this section is not yet attached to an interface. For information on attaching a service policy to an interface, see the chapter "Modular Quality of Service Command-Line Interface Overview" in this book.
Configuring a Class of Service Value
To mark a packet with a specific class of service (CoS) value, use the following commands beginning in global configuration mode:
The service policy configured in this section is not yet attached to an interface. For information on attaching a service policy to an interface, see the chapter "Modular Quality of Service Command-Line Interface Overview" in this book.
Note
Changing an ATM Cell Loss Priority Bit Setting
To set the Cell Loss Priority (CLP) bit to 1 on all packets matching a specified class, use the following commands beginning in global configuration mode:
The service policy configured in this section is not yet attached to an interface. For information on attaching a service policy to an interface, see the chapter "Modular Quality of Service Command-Line Interface Overview" in this book.
Verifying the Class-Based Packet Marking Feature
To verify the Class-Based Packet Marking feature, display the configuration of a policy map, and retrieve information regarding QoS packet marking features that are configured in policy-map configuration mode, use the following commands in EXEC mode, as needed:
Class-Based Packet Marking Configuration Examples
The following sections provide Class-Based Packet Marking configuration examples:
•
•
•
•
•
For information on how to configure Class-Based Packet Marking, see the section "Class-Based Packet Marking Configuration Task List" in this chapter.
Configuring an IP Precedence Value Example
In the following example, a service policy called policy1 is created. This service policy is associated to a previously defined classification policy through the use of the class command. This example assumes that a classification policy called class1 was previously configured.
In the following example, the IP Precedence bit in the Type of Service (ToS) byte is set to 1:
Router(config)# policy-map policy1 Router(config-pmap)# class class1 Router(config-pmap-c)# set ip precedence 1The service policy configured in this section is not yet attached to an interface. For information on attaching a service policy to an interface, see the chapter "Modular Quality of Service Command-Line Interface Overview" in this book.
Configuring an IP DSCP Value Example
In the following example, a service policy called policy1 is created. This service policy is associated to a previously defined classification policy through the use of the class command. This example assumes that a classification policy called class1 was previously configured.
In the following example, the IP DSCP value in the ToS byte is set to 5:
Router(config)# policy-map policy1 Router(config-pmap)# class class1 Router(config-pmap-c)# set ip dscp 5Router(config-pmap-c)# class class2 Router(config-pmap-c)# set ip dscp efAfter you configure the settings shown for voice packets at the edge, all intermediate routers are configured to provide low latency treatment to the voice packets, as follows:
Router(config)# class-map voiceRouter(config-cmap)# match ip dscp efRouter(config)# policy qos-policyRouter(config-pmap)# class voiceRouter(config-pmap-c)# priority 24The service policy configured in this section is not yet attached to an interface. For information on attaching a service policy to an interface, see the chapter "Modular Quality of Service Command-Line Interface Overview" in this book.
Configuring a QoS Group Value Example
In the following example, a service policy called policy1 is created. This service policy is associated to a previously defined classification policy through the use of the class command. This example assumes that a classification policy called class1 was previously configured.
In the following example, the QoS group value is set to 4:
Router(config)# policy-map policy1 Router(config-pmap)# class class1 Router(config-pmap-c)# set qos-group 4The service policy configured in this section is not yet attached to an interface. For information on attaching a service policy to an interface, see the chapter "Modular Quality of Service Command-Line Interface Overview" in this book.
Configuring a Classifying CoS Values Example
In the following example, a service policy called policy1 is created. This service policy is associated to a previously defined classification policy through the use of the class command. This example assumes that a classification policy called class1 was previously configured.
In the following example, the CoS value is set to 5:
Router(config)# policy-map policy1 Router(config-pmap)# class class1 Router(config-pmap-c)# set cos 5The service policy configured in this section is not yet attached to an interface. For information on attaching a service policy to an interface, see the chapter "Modular Quality of Service Command-Line Interface Overview" in this book.
Changing the ATM CLP Value Example
In the following example, a service policy called policy1 is created. This service policy is associated to a previously defined classification policy through the use of the class command. This example assumes that a classification policy called class1 was previously configured.
In this example, all packets with IP Precedence values of 0 or 1 are sent with the CLP bit set to 1:
Router(config)# policy-map policy1Router(config-pmap)# class class1Router(config-pmap-c)# set atm-clpThe service policy configured in this section is not yet attached to an interface. For information on attaching a service policy to an interface, see the chapter "Modular Quality of Service Command-Line Interface Overview" in this book.
