QoS Child Service Policy for Priority Class
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1 First Published: November, 2006 The feature allows you to configure a child service policy with nonqueuing-based features and attach the child policy to a class. History of Release 12.2(31)SB2 Modification This feature was introduced and implemented on the Cisco series router for the PRE3. Finding Support Information for Platforms and Cisco IOS Software Images Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear. Contents Prerequisites for, page 2 Restrictions for, page 2 Information About, page 2 How to Configure a Child Policy Under a Parent Priority Class, page 3 Configuration Examples for Configuring a Child Policy Under a Priority Class, page 6 Additional References, page 9 Command Reference, page 10 Corporate Headquarters: Cisco Systems, Inc., 170 West Tasman Drive, San Jose, CA USA 2006 Cisco Systems, Inc. All rights reserved.
2 Prerequisites for Prerequisites for Traffic classes must be configured using the class-map command. Restrictions for The child policy that you attach to a class must be based on nonqueuing features. For example, if you attempt to do any of the following, an error message displays: Attach queuing-based child policy You cannot attach a child service policy that is based on queuing features to a class. For example, you cannot attach a bandwidth-based child policy to a class with configured. Add queuing features to child policy You cannot add queuing features (such as bandwidth) to a child policy that is already attached to a parent class with configured. Add to parent class If a queuing-based child policy is already attached to a non- class of a parent policy, you cannot then configure the command for the parent class. Information About The feature allows you to configure a child service policy with nonqueuing-based features and attach the child policy to a class. In a three-level hierarchical policy, the class to which you attach the child policy must be in the middle-level policy. In a two-level hierarchical policy (nested policy), the class to which you attach the child policy is in the parent policy. Prior to Cisco IOS Release 12.2(31)SB2, you could not attach a child service policy to a class even if the child policy contained nonqueuing-based commands. If you attempted to do so, an error message similar to the following displayed: Please remove before attaching a child policy. Priority Class of a Parent Policy A parent policy contains traffic classes with various queuing and nonqueuing features enabled on the classes. You can give to a traffic class by configuring the command under the class. The router processes the packets belonging to the class before processing non classes. 2
3 How to Configure a Child Policy Under a Parent Priority Class Hierarchical Policies A hierarchical policy is a quality of service (QoS) model that enables you to specify QoS behavior at multiple levels of hierarchy. Depending on the type of hierarchical policy you configure, you can use hierarchical policies to: Specify multiple policy maps to shape multiple queues together Apply specific policy map actions on the aggregate traffic Apply class-specific policy map actions Restrict the maximum bandwidth of a virtual circuit (VC) while allowing policing and marking of traffic classes within the VC All hierarchical policy types consist of a top-level parent policy and one or more child policies. The service-policy command is used to apply a policy to another policy, and a policy to an interface, subinterface, virtual circuit (VC), or virtual LAN (VLAN). How to Configure a Child Policy Under a Parent Priority Class To configure a child policy under a parent class, perform the following configuration tasks: Configuring a Child Policy Under a Priority Class, page 3 Attaching a Hierarchical Service Policy to a Subinterface, page 5 Configuring a Child Policy Under a Priority Class SUMMARY STEPS Use the following procedure to configure a child policy under a class. 1. enable 2. configure terminal 3. policy-map policy-map-name 4. class class-map-name 5. police [cir] bps [bc] burst-normal [be] burst-excess [conform-action action] [exceed-action action] [violate-action action] 6. exit 7. policy-map policy-map-name 8. class class-map-name service-policy policy-map-name 3
4 How to Configure a Child Policy Under a Parent Priority Class DETAILED STEPS Step 1 Step 2 Command or Action enable Router> enable configure terminal Purpose Enables privileged EXEC mode. Enter your password if prompted. Enters global configuration mode. Step 3 Step 4 Step 5 Step 6 Router# configure terminal policy-map policy-map-name Router(config)# policy-map Business class class-map-name Router(config-pmap)# class video police [cir] bps [Bc] burst-normal [Be] burst-excess [conform-action action] [exceed-action action] [violate-action action] Router(config-pmap-c)# police conform-action transmit exceed-action set-dscp-transmit 5 exit Creates or modifies the child policy. Enters policy-map configuration mode. policy-map-name is the name of the child policy map. The name can be a maximum of 40 alphanumeric characters. Assigns the traffic class you specify to the policy map. Enters policy-map class configuration mode. class-map-name is the name of a previously configured class map. Configures traffic policing. cir is the committed information rate. bps specifies the average rate in bits per second (bps). Bc is the normal or committed burst (bc) size used by the first token bucket for policing. burst-normal specifies the committed burst size in bytes. Be is the excess burst (be) size used by the second token bucket for policing. burst-excess specifies the excess burst in bytes. conform-action action specifies the action to take on packets that conform to the rate limit. exceed-action action specifies the action to take on packets that exceed the rate limit, but not the peak information rate (PIR). violate-action action specifies the action to take on packets that continuously exceed the PIR limit. Exits policy-map class configuration mode. Router(config-pmap-c)# exit 4
5 How to Configure a Child Policy Under a Parent Priority Class Step 7 Step 8 Step 9 Command or Action policy-map policy-map-name Router(config-pmap)# policy-map Premium class class-map-name Router(config-pmap)# class Gold Purpose Creates or modifies the top-level parent policy (nested policy), or the middle-level policy (three-level hierarchical policy). policy-map-name is the name of the parent or middle-level policy map. The name can be a maximum of 40 alphanumeric characters. Assigns the traffic class you specify to the policy map. Enters policy-map class configuration mode. class-map-name is the name of a previously configured class map. Assigns to the traffic class. Step 10 Router(config-pmap-c)# service-policy policy-map-name Router(config-pmap-c)# service-policy Business Applies a child policy to the parent or middle-level class. policy-map-name is the name of a previously configured child policy map. Note For three-level hierarchical policies, after applying the child policy to the middle-level class, you must then apply the middle-level policy to the parent policy. For more information, see Defining QoS for Multiple Policy Levels in the Cisco Series Router Quality of Service Configuration Guide. Attaching a Hierarchical Service Policy to a Subinterface Use the following procedure to attach a hierarchical service policy to a subinterface. SUMMARY STEPS 1. enable 2. configure terminal 3. interface type slot/module/port.subinterface [point-to-point] 4. service-policy {input output} policy-map-name 5
6 Configuration Examples for Configuring a Child Policy Under a Priority Class DETAILED STEPS Step 1 Step 2 Command or Action enable Router> enable configure terminal Purpose Enables privileged EXEC mode. Enter your password if prompted. Enters global configuration mode. Step 3 Step 4 Router# configure terminal interface type slot/module/port.subinterface [point-to-point] Router(config)# interface atm 1/0/2.1 service-policy {input output} policy-map-name Router(config-subif)# service-policy input Premium Configures or modifies a subinterface. Enters subinterface configuration mode. type is the interface type (for example, ATM). slot/module/port is the slot, module, and port number of the interface card (for example, 1/0/0)..subinterface is the number of the subinterface (for example,.1) Applies an hierarchical policy to the subinterface. policy-map-name is the name of parent policy map. input indicates to apply the service policy to inbound packets. output indicates to apply the service policy to outbound packets. Configuration Examples for Configuring a Child Policy Under a Priority Class This section provides the following configuration examples: Configuring a Police-Based Child Policy Under a Priority Class: Example, page 7 Attaching a Bandwidth-Based Child Policy to a Priority Class Invalid Configuration: Example, page 7 Attaching Bandwidth to a Child Policy Attached to a Priority Class Invalid Configuration: Example, page 7 Attaching Priority to a Parent Policy with a Queuing-Based Child Policy Invalid Configuration: Example, page 8 6
7 Configuration Examples for Configuring a Child Policy Under a Priority Class Configuring a Police-Based Child Policy Under a Priority Class: Example The following example configuration shows how to configure a child policy with policing enabled and attach it to a class of a parent policy. police Attaching a Bandwidth-Based Child Policy to a Priority Class Invalid Configuration: Example As shown in the following example configuration, the router does not allow you to attach a bandwidth-based child policy to a class of a parent policy. This is an invalid configuration. bandwidth 100 Please remove before attaching a child policy. show policy-map bandwidth 100 Attaching Bandwidth to a Child Policy Attached to a Priority Class Invalid Configuration: Example As shown in the following example configuration, the router does not allow you to add the bandwidth command to a child policy that is already attached to a class of a parent policy. This is an invalid configuration. police cir bc 1500 conform-action transmit exceed-action drop 7
8 Configuration Examples for Configuring a Child Policy Under a Priority Class bandwidth 10 Cannot configure bandwidth in child policy with in parent show policy-map police cir bc 1500 conform-action transmit exceed-action drop Attaching Priority to a Parent Policy with a Queuing-Based Child Policy Invalid Configuration: Example As shown in the following example configuration, the router does not allow you to assign to a class of a parent policy when a queuing-based child policy is already attached to the parent class. This is an invalid configuration. bandwidth 10 police cir bc 1500 conform-action transmit exceed-action drop Cannot configure in parent policy with queuing-related child policy. show policy-map bandwidth 10 police cir bc 1500 conform-action transmit exceed-action drop 8
9 Additional References Additional References The following sections provide references related to the feature. Related Documents Related Topic Hierarchical policies Policing and shaping Policy maps Document Title Cisco Series Router Quality of Service Configuration Guide Defining QoS for Multiple Policy Levels Cisco IOS Quality of Service Solutions Configuration Guide Part 4: Policing and Shaping > Policing and Shaping Overview Cisco Series Router Quality of Service Configuration Guide Policing Traffic Shaping Traffic Cisco Series Router Quality of Service Configuration Guide Configuring QoS Policy Actions and Rules Standards Standard No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature. Title MIBs MIB No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature. MIBs Link To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: RFCs RFC No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature. Title 9
10 Command Reference Technical Assistance Description The Cisco Technical Support & Documentation website contains thousands of pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content. Link Command Reference This feature uses no new or modified commands. CCVP, the Cisco Logo, and the Cisco Square Bridge logo are trademarks of Cisco Systems, Inc.; Changing the Way We Work, Live, Play, and Learn is a service mark of Cisco Systems, Inc.; and Access Registrar, Aironet, BPX, Catalyst, CCDA, CCDP, CCIE, CCIP, CCNA, CCNP, CCSP, Cisco, the Cisco Certified Internetwork Expert logo, Cisco IOS, Cisco Press, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Cisco Unity, Enterprise/Solver, EtherChannel, EtherFast, EtherSwitch, Fast Step, Follow Me Browsing, FormShare, GigaDrive, GigaStack, HomeLink, Internet Quotient, IOS, IP/TV, iq Expertise, the iq logo, iq Net Readiness Scorecard, iquick Study, LightStream, Linksys, MeetingPlace, MGX, Networking Academy, Network Registrar, Packet, PIX, ProConnect, RateMUX, ScriptShare, SlideCast, SMARTnet, StackWise, The Fastest Way to Increase Your Internet Quotient, and TransPath are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the United States and certain other countries. All other trademarks mentioned in this document or Website are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0609R) Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental Cisco Systems, Inc. All rights reserved. 10
QoS: Child Service Policy for Priority Class
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