QoS Hierarchical Queueing for ATM DSLAMs

This feature module describes how to configure quality of service (QoS) hierarchical queueing policy maps on sessions and ATM VCs in ATM Digital Subscriber Line Access Multiplexer (A-DSLAM) applications on a Cisco ASR 1000 Series Aggregation Services Router.

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Prerequisites for QoS Hierarchical Queueing for ATM DSLAMs

You must configure traffic classes using the class-map command.

Restrictions for QoS Hierarchical Queueing for ATM DSLAMs

The QoS Hierarchical Queueing for ATM DSLAMs feature is not supported in combination with load balancing when a session service policy is routed to a Layer 2 Tunnel Protocol (L2TP) tunnel. This feature is supported only with shaped ATM VCs, which means ATM VCs that are defined as constant bit rate (CBR), Variable bit rate (VBR) or shaped unspecified bit rate (UBR), (that is, UBR with a peak cell rate).

Information About QoS Hierarchical Queueing for ATM DSLAMs

Different Levels of QoS Provisioning

Traffic downstream from a Broadband Router Access Server (BRAS) requires different levels of QoS provisioning (for example, traffic shaping) depending on the network architecture between the BRAS and the subscriber. The figure below illustrates an ATM DSL access network. The sample network includes multiple entities where QoS provisioning is required for different reasons.

Figure 1. ATM DSL Access Network

Integrated Queueing Hierarchy

Different traffic shaping requirements result in QoS provisioning at multiple levels at the same time. The QoS-Hierarchical Queueing for ATM DSLAMs feature provides the ability to form one integrated queueing hierarchy that provides QoS provisioning at multiple levels with support for features such as bandwidth distribution at any of these levels.

The integrated queueing hierarchy is formed on the physical interface. When a service policy is instantiated on a session, the Subscriber Service Switch (SSS) infrastructure invokes the Modular QoS CLI (MQC) and a common queueing control plane sets up and enables the queueing features.

Session-to-ATM associations are resolved to determine the ATM VC on which the session QoS queues are built. QoS policies consisting of a shaper may also be applied simultaneously at the VC level.

Configuration Guidelines for Hierarchical Queueing on ATM DSLAMs

When configuring the QoS Hierarchical Queueing for ATM DSLAMs feature, note the following guidelines:

  • When an ATM VC is used to aggregate a number of sessions with queueing policies, a queueing policy at an ATM VC level must be a one-level policy map that is configured as class-default with only the shape feature enabled.

  • Both ATM VCs and sessions can be oversubscribed and controlled by shapers.

How to Configure QoS Hierarchical Queueing for ATM DSLAMs

Configuring and Applying QoS Hierarchical Queueing Policy Maps to Sessions

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    policy-map policy-map-name

    4.    class class-map-name

    5.    bandwidth {bandwidth-kbps | percentpercentage| remainingpercentpercentage}

    6.    exit

    7.    exit

    8.    policy-map policy-map-name

    9.    class class-default

    10.    shape average {cir| percentpercentage}

    11.    bandwidth remaining ratio ratio

    12.    service-polic ypolicy-map-name

    13.    exit

    14.    exit

    15.    interface virtual-template number

    16.    service-policy output policy-map-name

    17.    end


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example:
    Router> enable
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.

     
    Step 2 configure terminal


    Example:
    Router# configure terminal
     

    Enters global configuration mode.

     
    Step 3 policy-map policy-map-name


    Example:
    Router(config)# policy-map session-a-child
     

    Creates a child policy and enters policy-map configuration mode.

    • Enter the policy-map name.

     
    Step 4 class class-map-name


    Example:
    Router(config-pmap)# class voip
     

    Configures the traffic class that you specify and enters policy-map class configuration mode.

    • Enter the name of a previously configured class map .

     
    Step 5 bandwidth {bandwidth-kbps | percentpercentage| remainingpercentpercentage}

    Example:
    Router(config-pmap-c)# bandwidth 10000


    Example:
    
 
		  
    
 
          		  
			 
     (Optional) Enables class-based weighted fair queueing based on the keywords and arguments specified. 
			 
    
 
			 
    •  bandwidth-kbps--Specifies the minimum bandwidth allocated for a class belonging to a policy map. Valid values are from 1 to 2,000,000. 
				
      

      • 

    •  percent percentage--Specifies the minimum percentage of the link bandwidth allocated for a class belonging to a policy map. Valid values are from 1 to 100. 
				
      

      • 

    •  remaining percent percentage--Specifies the minimum percentage of unused link bandwidth allocated for a class belonging to a policy map. Valid values are from 1 to 99. 
				
      

      • 

    
 
		   
      
    

    Step 6 
			  
				exit 
			  
		  
     

    Example:
     
			 
    Router(config-pmap-c)# exit
    
 
		  
    
 
          		  
			 
     Exits policy-map class configuration mode.
			 
    
 
		   
      
    

    Step 7 
			  
				exit 
			  
		  
     

    Example:
     
			 
    Router(config-pmap)# exit
    
 
		  
    
 
          		  
			 
     Exits policy-map configuration mode.
			 
    
 
		   
      
    

    Step 8 
			  
				policy-map 
			  
			  
				policy-map-name 
			  
		  
     

    Example:
     
			 
    Router(config)# policy-map session_a_parent
    
 
		  
    
 
          		  
			 
     Creates a parent policy and enters policy-map configuration mode. 
			 
    
 
			 
    •  Enter the policy-map name. 
				
      

      • 

    
 
		   
      
    

    Step 9 
			  
				class 
			  
			  
				class-default 
			  
		  
     

    Example:
     
			 
    Router(config-pmap)# class class-default
    
 
		  
    
 
          		  
			 
     Configures the traffic class as class-default and enters policy-map class configuration mode.
			 
    
 
			 
    Note   
                
              
     Do not configure any other traffic class. 
			 
    

    
 
		   
      
    

    Step 10 
			  
				shape 
			  average {cir| 
			 percentpercentage}
		  
     

    Example:
     
			 
    Router(config-pmap-c)# shape average 10000000
    
 
		  
    
 
          		  
			 
     Specifies average-rate traffic shaping for all traffic that does not match any other traffic class.
			 
    
 
			 
    •  Enter the 
				  average keyword followed by the committed information rate (CIR), in bits per second (bps), or enter the 
				  average keyword followed by 
				  percentage keyword to specify a percentage of the interface bandwidth for the CIR. Valid values are from 1 to 100. 
				
      

      • 

    
 
		   
      
    

    Step 11 
			  
				bandwidth 
				remaining 
				ratio 
			  
			  
				ratio 
			  
		  
     

    Example:
     
			 
    Router(config-pmap-c)# bandwidth remaining ratio 10
    
 
		  
    
 
          		  
			 
     Specifies the weight (ratio) for the ATM VC. 
			 
    
 
			 
    •  Enter the relative weight of this ATM VC (or class queue). This number (ratio) indicates the proportional relationship between the other ATM VCs or class queues. 
				
      

      • 

    
 
		   
      
    

    Step 12 
			  
				service-polic 
			 ypolicy-map-name
		  
     

    Example:
     
			 
    Router(config-pmap-c)# service-policy session-a-child 
    
 
		  
    
 
          		  
			 
     Applies the child policy map to the parent class-default class. 
			 
    
 
			 
    •  Enter the name of a previously configured child policy map.
				
      

      • 

    
 
		   
      
    

    Step 13 
			  
				exit 
			  
		  
     

    Example:
     
			 
    Router(config-pmap-c)# exit
    
 
		  
    
 
          		  
			 
     Exits policy-map class configuration mode. 
			 
    
 
		   
      
    

    Step 14 
			  
				exit 
			  
		  
     

    Example:
     
			 
    Router(config-pmap)# exit
    
 
		  
    
 
          		  
			 
     Exits policy-map configuration mode. 
			 
    
 
		   
      
    

    Step 15 
			  
				interface 
				virtual-template 
			  
			  
				number 
			  
		  
     

    Example:
     
			 
    Router(config)# interface virtual-template 1
    
 
		  
    
 
          		  
			 
     Creates a virtual template and enters interface configuration mode. 
			 
    
 
			 
    •  Enter the virtual template number. Valid range is from 1 to 4095. 
				
      

      • 

    
 
		   
      
    

    Step 16 
			  
				service-policy 
			  
			  
				output 
			  
			  
				policy-map-name 
			  
		  
     

    Example:
     
			 
    Router(config-if)# service-policy output session_a_parent
    
 
		  
    
 
          		  
			 
     Applies the service policy to the virtual interface.
			 
    
 
			 
    •  Enter the name of the previously configured parent policy map. 
				
      

      • 

    
 
			 
    Note   
                
              
     You must specify the output keyword to apply the service policy to outbound traffic on the interface. 
			 
    

    
 
		   
      
    

    Step 17 
			  
				end 
			  
		  
     

    Example:
     
			 
    Router(config-if)# end
    
 
		  
    
 
          		  
			 
     (Optional) Returns to privileged EXEC mode.
			 
    
 
		   
      
    

    

    Examples
    
		
		
     The following is an example of how to configure and apply a QoS hierarchical queueing policy map to PPP/IP sessions by using a virtual template:
		
    

		
    Router> enable 
Router# configure terminal 
Router(config)# policy-map session-a-child 
Router(config-pmap)# class voip 
Router(config-pmap-c)# police 1000000 
Router(config-pmap-c)# priority level 1
Router(config-pmap-c)# exit
Router(config-pmap)# class video 
Router(config-pmap-c)# police 100000 
Router(config-pmap-c)# priority level 2 
Router(config-pmap-c)# exit
Router(config-pmap)# class precedence_0 
Router(config-pmap-c)# bandwidth remaining ratio 10 
Router(config-pmap-c)# exit
Router(config-pmap)# class precedence_1 
Router(config-pmap-c)# bandwidth remaining ratio 20 
Router(config-pmap-c)# exit 
Router(config-pmap)# exit 
Router(config)# policy-map session_a_parent 
Router(config-pmap-c)# exit
Router(config-pmap)# class class-default 
Router(config-pmap-c)# shape average 10000000 
Router(config-pmap-c)# bandwidth remaining ratio 10 
Router(config-pmap-c)# service-policy session-a-child 
Router(config-pmap-c)# exit 
Router(config-pmap)# exit 
Router(config)# interface virtual-template 20 
Router(config-if)# service-policy output session_a_parent 
Router(config-if)# end
    

	 
    

    

    

    Configuring and Applying QoS Hierarchical Queueing Policy Maps to ATM VCs
    

    SUMMARY STEPS
      1.   
       
			  
				enable 
			  
		  
      

      2.   
       
			  
				configure 
			  
			  
				terminal 
			  
		  
      

      3.   
       
			  
				policy-map 
			  
			  
				policy-map-name 
			  
		  
      

      4.   
       
			  
				class 
			  
			  
				class-default 
			  
		  
      

      5.   
       
			  
				shape 
			  
			  
				average 
			  {cir| 
			 percentpercentage}
		  
      

      6.   
       
			  
				exit 
			  
		  
      

      7.   
       
			  
				exit 
			  
		  
      

      8.   
       interface type slot/subslot/port.subinterface 
		  
      

      9.   
       pvc [name] 
			 vpi/vci [ces | 
			 ilmi | 
			 qsaal | 
			 smds| 
			 l2transport]
		  
      

      10.   
       
			  
				vbr-nrt 
			  
			  
				peak-cell-rate 
			  
			  
				average-cell-rate 
			  
		  
      

      11.   
       
			  
				service-policy 
			  
			  
				output 
			  
			  
				policy-map-name 
			  
		  
      

      12.   
       
			  
				end 
			  
		  
      


    DETAILED STEPS
       Command or ActionPurpose
      Step 1 
			  
				enable 
			  
		  
       

      Example:
       
			 
      Router> enable
      
 
		  
      
 
            		  
			 
       Enables privileged EXEC mode. 
			 
      
 
			 
      •  Enter your password if prompted.
				
        

        • 

      
 
		   
      
      

      Step 2 
			  
				configure 
			  
			  
				terminal 
			  
		  
       

      Example:
       
			 
      Router# configure terminal
      
 
		  
      
 
            		  
			 
       Enters global configuration mode.
			 
      
 
		   
      
      

      Step 3 
			  
				policy-map 
			  
			  
				policy-map-name 
			  
		  
       

      Example:
       
			 
      Router(config)# policy-map subint-1
      
 
		  
      
 
            		  
			 
       Creates a policy map and enters policy-map configuration mode. 
			 
      
 
			 
      •  policy-map-name--The name of the policy map. 
				
        

        • 

      
 
		   
      
      

      Step 4 
			  
				class 
			  
			  
				class-default 
			  
		  
       

      Example:
       
			 
      Router(config-pmap)# class class-default
      
 
		  
      
 
            		  
			 
       Configures the traffic class as class-default and enters policy-map class configuration mode. 
			 
      
 
			 
      •  Do not configure any other traffic class. 
				
        

        • 

      
 
			 
      Note   
                
              
       When an ATM VC aggregates a number of sessions with queueing policies, a queueing policy at an ATM VC level must be a one-level policy map that is configured as class-default. 
			 
      

      
 
		   
      
      

      Step 5 
			  
				shape 
			  
			  
				average 
			  {cir| 
			 percentpercentage}
		  
       

      Example:
       
			 
      Router(config-pmap-c)# shape average 10000000 
      
 
		  
      
 
            		  
			 
       Specifies average-rate traffic shaping for all traffic that does not match any other traffic class.
			 
      
 
			 
      •  Enter the 
				  average keyword followed by the CIR, in bps or enter the 
				  average keyword followed by 
				  percentage keyword to specify a percentage of the interface bandwidth for the CIR. Valid values are from 1 to 100. 
				
        

        • 

      
 
			 
      Note   
                
              
       When an ATM VC aggregates a number of sessions with queueing policies, a queueing policy at an ATM VC level must be a one-level policy map with only the shape feature enabled. 
			 
      

      
 
		   
      
      

      Step 6 
			  
				exit 
			  
		  
       

      Example:
       
			 
      Router(config-pmap-c)# exit
      
 
		  
      
 
            		  
			 
       Exits policy-map class configuration mode. 
			 
      
 
		   
      
      

      Step 7 
			  
				exit 
			  
		  
       

      Example:
       
			 
      Router(config-pmap)# exit
      
 
		  
      
 
            		  
			 
       Exits policy-map configuration mode. 
			 
      
 
		   
      
      

      Step 8 interface type slot/subslot/port.subinterface 
		   

      Example:
       
			 
      Router(config)# interface ATM 3/1/1.1
      
 
		  
      
 
            		  
			 
       Specifies the ATM VC on which you are attaching the policy map and enters ATM VC configuration mode. 
			 
      
 
			 
      •  Enter the interface type and slot number, subslot number, port number, and ATM VC number.
				
        

        • 

      
 
		   
      
      

      Step 9 pvc [name] 
			 vpi/vci [ces | 
			 ilmi | 
			 qsaal | 
			 smds| 
			 l2transport]
		   

      Example:
       
			 
      Router(config-if-atm-vc)# pvc 2/100
      
 
		  
      
 
            		  
			 
       Selects the ATM VC to which the service policy is to be applied. 
			 
      
 
		   
      
      

      Step 10 
			  
				vbr-nrt 
			  
			  
				peak-cell-rate 
			  
			  
				average-cell-rate 
			  
		  
       

      Example:
       
			 
      Router(config-if-atm-vc)# vbr-nrt 800000 800000
      
 
		  
      
 
            		  
			 
       Sets the VC type to VBR with a peak and average cell rate.
			 
      
 
		   
      
      

      Step 11 
			  
				service-policy 
			  
			  
				output 
			  
			  
				policy-map-name 
			  
		  
       

      Example:
       
			 
      Router(config-subif)# service-policy output subint-1 
      
 
		  
      
 
            		  
			 
       Attaches the service policy to the ATM VC.
			 
      
 
			 
      •  policy-map-name--The name of the previously configured policy map. 
				
        

        • 

      
 
			 
      Note   
                
              
       You must specify the output keyword to apply the service policy to outbound traffic on the ATM VC. 
			 
      

      
 
		   
      
      

      Step 12 
			  
				end 
			  
		  
       

      Example:
       
			 
      Router(config-subif)# end
      
 
		  
      
 
            		  
			 
       (Optional) Returns to privileged EXEC mode.
			 
      
 
		   
      
      

      

      Examples
      
		
		
       The following is an example of how to configure and apply a QoS hierarchical queueing policy map to an ATM VC (and provide aggregate shaping for a large number of subscribers):
		
      

		
      Router> enable 
Router# configure terminal
Router(config)# policy-map subint-1
Router(config-pmap)# class class-default
Router(config-pmap-c)# shape average 10000000
Router(config-pmap-c)# exit 
Router(config-pmap)# exit 
Router(config)# interface ATM 3/1/1.1
Router(config-if-atm-vc)# pvc 2/100
Router (config-if-atm-vc)# vbr-nrt 800000 800000
Router(config-subif)# service-policy output subint-1
Router(config-subif)# end 
      

	 
      

      

      

      Displaying Policy-Map Information for Hierarchical Queueing
      

      SUMMARY STEPS
        1.   
      
          
            enable
          
        
        

        2.   
      
          
            show
            policy-map
          
        
        

        3.   
      
          
            show
            policy-map
            interface
          
          
            type
            number
          
        
        

        4.   
      
          
            show
            policy-map
            session
          
        
        

        5.   
      
          
            exit
          
        
        


      DETAILED STEPS
         Command or ActionPurpose
        Step 1
          
            enable
          
        
         

        Example:
        
          
        Router> enable
        

        
        
 
              		 
          
        
Enables privileged EXEC mode. 
        

          
        • 
Enter your password if prompted.
          

          • 

        

         
      
        

        Step 2
          
            show
            policy-map
          
        
         

        Example:
        
          
        Router# show policy-map
        

        
        
 
              		 
          
        
(Optional) Displays all information for all class maps. 
        

         
      
        

        Step 3
          
            show
            policy-map
            interface
          
          
            type
            number
          
        
         

        Example:
        
          
        Router# 
show policy-map interface ATM 4/0/0.1
        

        
        
 
              		 
          
        
(Optional) Displays the packet statistics of all classes that are configured for all service policies either on the specified interface or ATM VC or on a specific PVC on the interface. 
        

          
        • 
Enter the interface type and number.
          

          • 

        

         
      
        

        Step 4
          
            show
            policy-map
            session
          
        
         

        Example:
        
          
        Router# 
show policy-map session
        

        
        
 
              		 
          
        
(Optional) Displays the QoS policy map in effect for the SSS session.
        

         
      
        

        Step 5
          
            exit
          
        
         

        Example:
        
          
        Router# exit
        

        
        
 
              		 
          
        
(Optional) Exits privileged EXEC mode.
        

         
      
        

        

        

        

        

        Configuration Examples for QoS Hierarchical Queueing for ATM DSLAMs
        

        
    
        

        

        Example  Policy Maps on Sessions
        

        
      
        
The following example shows how to configure and apply QoS hierarchical queueing policy maps on sessions. A child queueing policy is applied to each parent subscriber line level policy.
        

      
        Router> enable
Router# configure terminal
Router(config)# policy-map service-a-out
Router(config-pmap)# class voip
Router(config-pmap-c)# priority
Router(config-pmap-c)# set cos 1
Router(config-pmap-c)# exit
Router(config-pmap)# class video
Router(config-pmap-c)# set cos 2
Router(config-pmap-c)# exit
Router(config-pmap)# class gaming
Router(config-pmap-c)# bandwidth remaining percent 80
Router(config-pmap-c)# set cos 3
Router(config-pmap-c)# exit
Router(config-pmap)# class class-default
Router(config-pmap-c)# bandwidth remaining percent 20
Router(config-pmap-c)# set cos 4
Router(config-pmap-c)# exit
Router(config-pmap)# exit
!
Router(config)# policy-map rate-1-service-a-out
Router(config-pmap)# class class-default
Router(config-pmap-c)# bandwidth remaining ratio 10
Router(config-pmap-c)# shape average 100000
Router(config-pmap-c)# service-policy service-a-out
Router(config-pmap-c)# exit
Router(config-pmap)# exit
!
Router(config)# policy-map rate-1-service-a-in
Router(config-pmap)# class voip
Router(config-pmap-c)# police percent 25
Router(config-pmap-c)# exit
Router(config-pmap)# class gaming
Router(config-pmap-c)# police percent 50
Router(config-pmap-c)# exit
Router(config-pmap)# class class-default
Router(config-pmap-c)# police percent 20
Router(config-pmap-c)# exit
Router(config-pmap)# exit
!
Router(config)# interface virtual-template 20
Router(config-if)# service-policy output rate-1-service-a-out
Router(config-if)# service-policy input rate-1-service-a-in
Router(config-if)# end

        

    
        

        

        

        Example  Policy Maps on Sessions with Aggregate Shaping
        

        
      
        
The following example shows how to configure and apply QoS hierarchical queueing policy maps on sessions with multiple PPP/IP sessions per subscriber line. In this example, queueing is configured as in previous example. The VC is configured as follows:
        

      
        Router(config)# policy-map isp_A_out
Router(config-pmap)# class class-default
Router(config-pmap-c)# shape average 500000
Router(config-pmap-c)# exit
Router(config-pmap)# exit
Router(config)# interface ATM 1/0/0.1
Router(config-subif)# pvc 10/100
Router(config-if-atm-vc)# vbr-nrt 800000 800000
Router(config-if-atm-vc)# service-policy output isp-A-out
Router(config-if-atm-vc)# exit
Router(config-subif)# exit
        

    
        

        

        

        

        Additional References
        

         
	 
        

        Related Documents 
         
		 
		

         
					 
         Related Topic
					 
        
 
				          		
 
					 
         Document Title
					 
        
 
				          		

        
        

         
					 
         QoS commands: complete command syntax, command modes, command history, defaults, usage guidelines, and examples
					 
        
 
				          		
 
					 
         Cisco IOS Quality of Service Solutions Command Reference
					 
        
 
				          		

        

         
					 
         Traffic shaping
					 
        
 
				          		
 
					 
         "Regulating Traffic Flow Using Traffic Shaping" module 
					 
        
 
				          		

        

         
					 
         MQC
					 
        
 
				          		
 
					 
         "Applying QoS Features Using the MQC" module
					 
        
 
				          		

        
        

        

        
 
	 
        

        Standards
         
		 
		

         
					 
         Standard
					 
        
 
				          		
 
					 
         Title
					 
        
 
				          		

        
        

         
					 
         No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature. 
					 
        
 
				          		
 
					 
         -- 
					 
        
 
				          		

        
        

        

        
 
	 
        

        MIBs
         
		 
		

         
					 
         MIB
					 
        
 
				          		
 
					 
         MIBs Link
					 
        
 
				          		

        
        

         
					 
         No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature.
					 
        
 
				          		
 
					 
         To locate and download MIBs for selected platforms, Cisco IOS XE Software releases, and feature sets, use Cisco MIB Locator found at the following URL:
					 
        
 
					 
         
						http:/​/​www.cisco.com/​go/​mibs 
					 
        
 
				          		

        
        

        

        
 
	 
        

        RFCs
         
		 
		

         
					 
         RFC
					 
        
 
				          		
 
					 
         Title
					 
        
 
				          		

        
        

         
					 
         No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.
					 
        
 
				          		
 
					 
         --
					 
        
 
					 
         
					 
        
 
				          		

        
        

        

        
 
	 
        

        Technical Assistance
         
		 
		

         
					 
         Description
					 
        
 
				          		
 
					 
         Link
					 
        
 
				          		

        
        

         
					 
         The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. 
					 
        
 
				          		
 
					 
         
						http:/​/​www.cisco.com/​cisco/​web/​support/​index.html 
					 
        
 
				          		

        
        

        

        
 
	 
        

        

        

        Feature Information for QoS Hierarchical Queueing for ATM DSLAMs
        

         
		
        The following table
		  provides release information about the feature or features described in this
		  module. This table lists only the software release that introduced support for
		  a given feature in a given software release train. Unless noted otherwise,
		  subsequent releases of that software release train also support that feature. 
		
        
 Use Cisco Feature Navigator to find information about platform
		support and Cisco software image support. To access Cisco Feature Navigator, go
		to 
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		An account on Cisco.com is not required. 
	 
        

         
		

        Table 1 Feature Information for QoS Hierarchical Queueing for ATM DSLAMs
         
				  
         Feature Name
				  
        
 
				        		
 
				  
         Releases
				  
        
 
				        		
 
				  
         Feature Information
				  
        
 
				        		

        
        

         
				  
         QoS Hierarchical Queueing for ATM DSLAMs
				  
        
 
				        		
 
				  
         Cisco IOS XE Release 2.4 Cisco IOS XE Release 2.5
				  
        
 
				        		
 
				  
         This feature module describes how to configure QoS hierarchical queueing policy maps on sessions and ATM VCs in ATM Digital Subscriber Line Access Multiplexer (A-DSLAM) applications. 
				  
        
 
				  
         This feature was implemented on Cisco ASR 1000 Series Aggregation Services Routers.