QoS: Policing and Shaping Configuration Guide, Cisco IOS XE Release 3S
Distribution of Remaining Bandwidth Using Ratio
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Distribution of Remaining Bandwidth Using Ratio

Contents

Distribution of Remaining Bandwidth Using Ratio

The Distribution of Remaining Bandwidth Using Ratio feature allows service providers to configure a bandwidth-remaining ratio on subinterfaces and class queues. This ratio specifies the relative weight of a subinterface or queue with respect to other subinterfaces or queues. During congestion, the router uses this bandwidth-remaining ratio to determine the amount of excess bandwidth (unused by priority traffic) to allocate to a class of nonpriority traffic. The router allocates excess bandwidth relative to the other subinterface-level queues and class queues configured on the physical interface. By administration of a bandwidth-remaining ratio, traffic priority is not based solely on speed. Instead, the service provider can base priority on alternative factors such as service product and subscription rate.

Finding Feature Information

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Prerequisites for Distribution of Remaining Bandwidth Using Ratio

Before enabling the Distribution of Remaining Bandwidth Using Ratio feature, create as many traffic classes as you need by using the class-map command.

Restrictions for Distribution of Remaining Bandwidth Using Ratio

  • Bandwidth-remaining ratios can be used on outbound interfaces only.
  • The bandwidth remaining ratio command cannot coexist with another bandwidth command in different traffic classes of the same policy map. For example, the following configuration is not valid and causes an error message to display:
policy-map Prec1
 class precedence_0
  bandwidth remaining ratio 10
 class precedence_2
  bandwidth 1000
  • The bandwidth remaining ratio command cannot coexist with another bandwidth command in the same class. For example, the following configuration is not valid and causes an error message to display:
policy-map Prec1
 class precedence_0
  bandwidth 1000
  bandwidth remaining ratio 10
  • The bandwidth remaining ratio command cannot coexist with the priority command in the same class. For example, the following configuration is not valid and causes an error message to display:
policy-map Prec1
 class precedence_1
  priority percent 10
  bandwidth remaining ratio 10

Information About Distribution of Remaining Bandwidth Using Ratio

Benefits of the Distribution of Remaining Bandwidth Using Ratio Feature

The Distribution of Remaining Bandwidth Using Ratio feature allows service providers to prioritize subscriber traffic during periods of congestion. A bandwidth-remaining ratio is used to influence how the router allocates excess bandwidth (unused by priority traffic) to a class of nonpriority traffic. Instead of using only bandwidth rate, the router considers configured minimum bandwidth rates, maximum bandwidth rates, and bandwidth-remaining ratios when determining excess bandwidth allocation. A bandwidth-remaining ratio adds more flexibility in prioritizing traffic and enables you to influence excess bandwidth allocation by basing the bandwidth-remaining ratio on factors other than speed.

With bandwidth-remaining ratios, service providers have more flexibility in assigning priority to subinterfaces and queues during congestion. In addition to speed, you can base the bandwidth-remaining ratio on alternative factors, such as a service product or subscription rate. In this way, for example, you can give higher weight to subinterfaces that carry business services and lower weight to subinterfaces that carry residential services.

Bandwidth-Remaining Ratio Functionality

A bandwidth-remaining ratio, specified by the bandwidth remaining ratio command, is a value from 1 to 1000 that is used to determine the amount of unused (excess) bandwidth to allocate to a class-level queue or subinterface-level queue during congestion. The router allocates the excess bandwidth relative to the other class-level queues and subinterface-level queues configured on the physical interface. The bandwidth-remaining ratio value does not indicate a percentage. As the name implies, a ratio is used. For example, a subinterface with a bandwidth-remaining ratio of 100 receives 10 times the unused (excess) bandwidth during congestion than a subinterface with a bandwidth-remaining ratio of 10.

Without bandwidth-remaining ratios, the queueing mechanism or scheduler on the router allocates unused (excess) bandwidth equally among the classes or subinterfaces.

With bandwidth-remaining ratios, unused (excess) bandwidth allocation can be based on factors other than the bandwidth rate (for example, the service product or the subscription rate).

Using the bandwidth remaining ratio command, the bandwidth-remaining ratio can be configured differently on each subinterface or class. The bandwidth-remaining ratio can range from 1 to 1000. For example, if there are three subscribers, and the bandwidth-remaining ratios are configured as 9, 7, and 1, and if after priority traffic is served, there are 1700 kbps of excess bandwidth, the subscribers get 900 kbps, 700 kbps, and 100 kbps, respectively.

How to Configure Distribution of Remaining Bandwidth Using Ratio

You can apply bandwidth-remaining ratios to subinterfaces and/or classes queues.

Configuring and Applying Bandwidth-Remaining Ratios to Subinterfaces


Note


You can apply bandwidth-remaining ratios to outbound subinterfaces only.

>
SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    policy-map child-policy-name

    4.    class class-map-name

    5.    bandwidth bandwidth-kbps

    6.    Repeat Steps 4 and 5 to configure additional traffic classes, if needed.

    7.    exit

    8.    exit

    9.    policy-map parent-policy-name

    10.    class class-default

    11.    bandwidth remaining ratio ratio

    12.    shape {average | peak} cir [bc] [be]

    13.    service-policy child-policy-name

    14.    exit

    15.    exit

    16.    interface type slot / module / port . subinterface [point-to-point | multipoint]

    17.    service-policy output parent-policy-name

    18.    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 child-policy-name


    Example:
    Router(config)# policy-map Child
     

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

    • Enter the name of the child policy map.
     
    Step 4 class class-map-name


    Example:
    Router(config-pmap)# class precedence_0
     

    Configures the class map and enters policy-map class configuration mode.

     
    Step 5 bandwidth bandwidth-kbps


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

    Specifies the bandwidth, in kbps, to be allocated to this traffic class.

    • Enter the amount of bandwidth, in kilobits per second (kbps).
     
    Step 6 Repeat Steps 4 and 5 to configure additional traffic classes, if needed.  

     
    Step 7 exit


    Example:
    Router(config-pmap-c)# exit
     

    Exits policy-map class configuration mode.

     
    Step 8 exit


    Example:
    Router(config-pmap)# exit
     

    Exits policy-map configuration mode.

     
    Step 9 policy-map parent-policy-name


    Example:
    Router(config)# policy-map Parent
     

    Creates or modifies a parent policy map and enters policy-map configuration mode.

    • Enter the name of the parent policy map.
     
    Step 10 class class-default


    Example:
    Router(config-pmap)# class class-default
     

    Configures the class-default class and enters policy-map class configuration mode.

    Note   

    The router interprets any features that are configured under the class-default class as aggregate features on the subinterface.

     
    Step 11 bandwidth remaining ratio ratio


    Example:
    Router(config-pmap-c)# bandwidth remaining ratio 10
     

    Specifies the bandwidth-remaining ratio for the subinterface.

    • Enter the ratio.

    The ratio is the value used to determine the amount of unused bandwidth to allocate to each queue on the subinterface during periods of congestion. The scheduler allocates the excess bandwidth relative to other subinterfaces. Valid values are 1 to 1000. The default value is 1.

     
    Step 12 shape {average | peak} cir [bc] [be]


    Example:
    Router(config-pmap-c)# shape average 100000000
     

    (Optional) Shapes the average or peak rate to the rate that you specify.

    • Enter either the average or peak keyword along with the CIR and any optional arguments. Note the following:
      • average--Specifies average-rate shaping.
      • peak--Specifies peak-rate shaping.
      • cir--Specifies the committed information rate (CIR), in bits per second (bps).
      • (Optional) bc--Specifies the committed burst size, in bits.
      • (Optional) be--Specifies the excess burst size, in bits.
     
    Step 13 service-policy child-policy-name


    Example:
    Router(config-pmap-c)# service-policy Child
     

    Applies the child policy map that you specify to the traffic class.

    • Enter the name of the previously configured child policy map.

    The router applies the QoS actions (features) specified in the child policy map to the traffic class.

    Note   

    The service-policy command typically requires that you specify the direction of the traffic using the input or output keywords. However, when applying a child policy to a parent policy, do not specify a traffic direction.

     
    Step 14 exit


    Example:
    Router(config-pmap-c)# exit
     

    Exits policy-map class configuration mode.

     
    Step 15 exit


    Example:
    Router(config-pmap)# exit
     

    Exits policy-map configuration mode.

     
    Step 16 interface type slot / module / port . subinterface [point-to-point | multipoint]


    Example:
    Router(config)# interface GigabitEthernet 1/0/0.1
     

    Creates or modifies the interface that you specify and enters subinterface configuration mode.

    • Enter the interface type. Note the following:
      • type--Specifies the interface type (for example, Gigabit Ethernet).
      • slot/module/port.subinterface--Specifies the number of the subinterface that identifies the subinterface (for example, 1/0/0.1).
      • (Optional) point-to-point--Indicates that the subinterface is a point-to-point subinterface.
      • (Optional) multipoint--Indicates that the subinterface is a point-to-multipoint subinterface.
     
    Step 17 service-policy output parent-policy-name


    Example:
    Router(config-subif)# service-policy output Parent
     

    Applies the parent policy map to the subinterface.

    • Enter the output keyword and the name of the parent policy map.
    Note   

    The router shapes the subinterface traffic to the shaping rate specified in the parent class-default class and applies the QoS actions (features) specified in the child policy map.

    Note   

    During periods of congestion, the router uses the bandwidth-remaining ratio specified in the parent policy map to allocate unused bandwidth on this subinterface relative to other subinterfaces.

     
    Step 18 end


    Example:
    Router(config-subif)# end
     

    Returns to privileged EXEC mode.

     

    Configuring and Applying Bandwidth-Remaining Ratios to Class Queues

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    policy-map child-policy-name

      4.    class class-map-name

      5.    shape {average | peak} cir [bc] [be]

      6.    bandwidth remaining ratio ratio

      7.    Repeat Steps 4 , 5 , and 6 for each class queue that you want to define, specifying the bandwidth-remaining ratio as applicable.

      8.    exit

      9.    exit

      10.    policy-map parent-policy-name

      11.    class class-default

      12.    shape {average | peak} cir [bc] [be]

      13.    bandwidth remaining ratio ratio

      14.    service-policy child-policy-name

      15.    exit

      16.    exit

      17.    interface type slot / module / port . subinterface [point-to-point | multipoint]

      18.    service-policy output parent-policy-name

      19.    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 child-policy-name


      Example:
      Router(config)# policy-map Child
       

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

      • Enter the name of the child policy map.
       
      Step 4 class class-map-name


      Example:
      Router(config-pmap)# class precedence_0
       

      Configures the class map and enters policy-map class configuration mode.

       
      Step 5 shape {average | peak} cir [bc] [be]


      Example:
      Router(config-pmap-c)# shape average 100000000
       

      (Optional) Shapes the average or peak rate to the rate that you specify.

      • Enter either the average or peak keyword along with the CIR and any optional arguments. Note the following:
        • average--Specifies average-rate shaping.
        • peak--Specifies peak-rate shaping.
        • cir--Specifies the committed information rate (CIR), in bits per second (bps).
        • (Optional) bc--Specifies the committed burst size, in bits.
        • (Optional) be--Specifies the excess burst size, in bits.
       
      Step 6 bandwidth remaining ratio ratio


      Example:
      Router(config-pmap-c)# bandwidth remaining ratio 10
       

      Specifies the bandwidth-remaining ratio for the traffic class.

      • Enter the bandwidth-remaining ratio. The ratio is the value used to determine the amount of unused bandwidth to allocate to each queue on the subinterface during periods of congestion. The queueing mechanism or scheduler allocates the excess bandwidth relative to other subinterfaces. Valid values are 1 to 1000. The default value is 1.
      Note   

      In a hierarchical policy map structure, the bandwidth remaining ratioratio command must be used for at least one class. Using it in other classes is optional. When this command is not explicitly enabled in the other classes, the queueing mechanism uses 1 as the default.

       
      Step 7 Repeat Steps 4 , 5 , and 6 for each class queue that you want to define, specifying the bandwidth-remaining ratio as applicable.  

       
      Step 8 exit


      Example:
      Router(config-pmap-c)# exit
       

      Exits policy-map class configuration mode.

       
      Step 9 exit


      Example:
      Router(config-pmap)# exit
       

      Exits policy-map configuration mode.

       
      Step 10 policy-map parent-policy-name


      Example:
      Router(config)# policy-map Parent
       

      Creates or modifies a parent policy map and enters policy-map configuration mode.

      • Enter the name of the parent policy map.
       
      Step 11 class class-default


      Example:
      Router(config-pmap)# class class-default
       

      Configures the class-default class and enters policy-map class configuration mode.

      Note   

      The router interprets any features that are configured under the class-default class as aggregate features on the subinterface.

       
      Step 12 shape {average | peak} cir [bc] [be]


      Example:
      Router(config-pmap-c)# shape average 100000000
       

      (Optional) Shapes the average or peak rate to the rate that you specify.

      • Enter either the average or peak keyword along with the CIR and any optional arguments. Note the following:
        • average--Specifies average-rate shaping.
        • peak--Specifies peak-rate shaping.
        • cir--Specifies the committed information rate (CIR), in bits per second (bps).
        • (Optional) bc--Specifies the committed burst size, in bits.
        • (Optional) be--Specifies the excess burst size, in bits.
       
      Step 13 bandwidth remaining ratio ratio


      Example:
      Router(config-pmap-c)# bandwidth remaining ratio 10
       

      (Optional for class-default or other classes in a hierarchical policy map structure) Specifies the bandwidth-remaining ratio for the subinterface.

      • Enter the bandwidth-remaining ratio. The ratio is the value used to determine the amount of unused bandwidth to allocate to each queue on the subinterface during periods of congestion. The queueing mechanism or scheduler allocates the excess bandwidth relative to other subinterfaces. Valid values are 1 to 1000. The default value is 1.
      Note   

      In a hierarchical policy map structure, the bandwidth remaining ratioratio command must be used for at least one class. Using it in other classes is optional. When this command is not explicitly enabled in the other classes, the queueing mechanism uses 1 as the default.

       
      Step 14 service-policy child-policy-name


      Example:
      Router(config-pmap-c)# service-policy Child
       

      Applies the child policy map that you specify to the traffic class.

      • Enter the name of the child policy map. The router applies the QoS actions (features) specified in the child policy map to the traffic class.
      Note   

      The service-policycommand typically requires that you specify the direction of the traffic using the input or output keywords. However, when applying a child policy map to a parent policy map, do not specify traffic direction.

       
      Step 15 exit


      Example:
      Router(config-pmap-c)# exit
       

      Exits policy-map class configuration mode.

       
      Step 16 exit


      Example:
      Router(config-pmap)# exit
       

      Exits policy-map configuration mode.

       
      Step 17 interface type slot / module / port . subinterface [point-to-point | multipoint]


      Example:
      Router(config)# interface GigabitEthernet 1/0/0.1
       

      Creates or modifies the interface that you specify and enters subinterface configuration mode.

      • Enter the interface type. Note the following:
        • type--Specifies the interface type (for example, Gigabit Ethernet).
        • slot/module/port.subinterface--Specifies the number of the subinterface that identifies the subinterface (for example, 1/0/0.1).
        • (Optional) point-to-point--Indicates that the subinterface is a point-to-point subinterface.
        • (Optional) multipoint--Indicates that the subinterface is a point-to-multipoint subinterface.
       
      Step 18 service-policy output parent-policy-name


      Example:
      Router(config-subif)# service-policy output Parent
       

      Attaches the parent policy map to the subinterface.

      • Enter the outputkeyword and the name of the parent policy map.
      Note   

      When congestion occurs, the class queues receive bandwidth according to the specified class-level bandwidth-remaining ratios.

       
      Step 19 end


      Example:
      Router(config-subif)# end
       

      Returns to privileged EXEC mode.

       

      Configuration Examples for Distribution of Remaining Bandwidth Using Ratio

      Example Configuring Bandwidth-Remaining Ratios on Ethernet Subinterfaces

      The following example shows how to configure bandwidth-remaining ratios on an Ethernet subinterface using a hierarchical policy. In the example, Gigabit Ethernet subinterface 1/0/0.1 is shaped to 100 Mbps. During congestion, the router uses the bandwidth-remaining ratio of 10 to determine the amount of excess bandwidth (unused by priority traffic) to allocate to the nonpriority traffic on subinterface 1/0/0.1, relative to the other subinterface-level and class-level queues on the interface.

      policy-map Child
       class precedence_0
        bandwidth 10000
       class precedence_1
        shape average 100000
        bandwidth 100
      policy-map Parent
       class class-default
        bandwidth remaining ratio 10
        shape average 100000000
        service-policy Child
      interface GigabitEthernet1/0/0.1
       encapsulation dot1Q 100
       ip address 10.1.0.1 255.255.255.0
       service-policy output Parent

      Example Verifying Bandwidth-Remaining Ratios on Class Queues

      In the following sample configuration, vlan10_policy is applied on the Gigabit Ethernet subinterface 1/0/0.10 and vlan20_policy is applied on the Gigabit Ethernet subinterface 1/0/0.20. During congestion on the interface, subinterface Gigabit Ethernet 1/0/0.20 has 10 times more available bandwidth than subinterface Gigabit Ethernet 1/0/0.10 because the bandwidth-remaining ratio for subinterface Gigabit Ethernet 1/0/0.20 is 10 times more than the bandwidth-remaining ratio for subinterface 1/0/0.10: 100 on subinterface 1/0/0.20 and 10 on subinterface 1/0/0.10.

      When congestion occurs within a subinterface level, the class queues receive bandwidth according to the class-level bandwidth-remaining ratios. In the example, the bandwidth for classes precedence_0, precedence_1, and precedence_2 is allocated based on the bandwidth-remaining ratios of the classes: 20, 40, and 60, respectively.

      Router# show policy-map

      Policy Map child-policy
          Class precedence_0
            Average Rate Traffic Shaping
            cir 500000 (bps)
            bandwidth remaining ratio 20 <---- Class-level ratio
          Class precedence_1
            Average Rate Traffic Shaping
            cir 500000 (bps)
            bandwidth remaining ratio 40 <---- Class-level ratio
          Class precedence_2
            Average Rate Traffic Shaping
            cir 500000 (bps)
            bandwidth remaining ratio 60 <---- Class-level ratio
      Policy Map vlan10_policy
          Class class-default
            Average Rate Traffic Shaping
            cir 1000000 (bps)
            bandwidth remaining ratio 10 <---- Subinterface-level ratio
            service-policy child-policy
      Policy Map vlan20_policy
          Class class-default
            Average Rate Traffic Shaping
            cir 1000000 (bps)
            bandwidth remaining ratio 100 <---- Subinterface-level ratio
            service-policy child-policy
      interface GigabitEthernet1/0/0.10
       encapsulation dot1Q 10
       snmp trap link-status
       service-policy output vlan10_policy
      interface GigabitEthernet1/0/0.20
       encapsulation dot1Q 20
       snmp trap link-status
       service-policy output vlan20_policy

      Example Verifying Bandwidth Remaining Ratios

      The following sample output from the show policy-map interface command indicates that bandwidth-remaining ratios are configured on class-level queues in the policy maps named vlan10_policy and child-policy, which are attached to Gigabit Ethernet subinterface 1/0/0.10.

      Router# show policy-map interface GigabitEthernet 1/0/0.10
      GigabitEthernet1/0/0.10 
        Service-policy output: vlan10_policy
          Class-map: class-default (match-any)  
            0 packets, 0 bytes
            5 minute offered rate 0 bps, drop rate 0 bps
            Match: any 
            Queueing
            queue limit 64 packets
            (queue depth/total drops/no-buffer drops) 0/0/0
            (pkts output/bytes output) 0/0
            shape (average) cir 1000000, bc 4000, be 4000
            target shape rate 1000000
            bandwidth remaining ratio 10 
            Service-policy : child-policy
              Class-map: precedence_0 (match-all)  
                0 packets, 0 bytes
                5 minute offered rate 0 bps, drop rate 0 bps
                Match: ip precedence 0 
                Queueing
                queue limit 64 packets
                (queue depth/total drops/no-buffer drops) 0/0/0
                (pkts output/bytes output) 0/0
                shape (average) cir 500000, bc 2000, be 2000
                target shape rate 500000
                bandwidth remaining ratio 20 
              Class-map: precedence_1 (match-all)  
                0 packets, 0 bytes
                5 minute offered rate 0 bps, drop rate 0 bps
                Match: ip precedence 1 
                Queueing
                queue limit 64 packets
                (queue depth/total drops/no-buffer drops) 0/0/0
                (pkts output/bytes output) 0/0
                shape (average) cir 500000, bc 2000, be 2000
                target shape rate 500000
                bandwidth remaining ratio 40 
              Class-map: precedence_2 (match-all)  
                0 packets, 0 bytes
                5 minute offered rate 0 bps, drop rate 0 bps
                Match: ip precedence 2 
                Queueing
                queue limit 64 packets
                (queue depth/total drops/no-buffer drops) 0/0/0
                (pkts output/bytes output) 0/0
                shape (average) cir 500000, bc 2000, be 2000
                target shape rate 500000
                bandwidth remaining ratio 60 
              Class-map: class-default (match-any)  
                0 packets, 0 bytes
                5 minute offered rate 0 bps, drop rate 0 bps
                Match: any 
                
                queue limit 64 packets
                (queue depth/total drops/no-buffer drops) 0/0/0
                (pkts output/bytes output) 0/0
      

      The following sample output from the show policy-map interface command indicates that bandwidth-remaining ratios are configured on class-level queues in the policy maps named vlan20_policy and child-policy, which are attached to Gigabit Ethernet subinterface 1/0/0.20.

      Router# show policy-map interface GigabitEthernet 1/0/0.20
      GigabitEthernet1/0/0.20 
        Service-policy output: vlan20_policy
          Class-map: class-default (match-any)  
            0 packets, 0 bytes
            5 minute offered rate 0 bps, drop rate 0 bps
            Match: any 
            Queueing
            queue limit 64 packets
            (queue depth/total drops/no-buffer drops) 0/0/0
            (pkts output/bytes output) 0/0
            shape (average) cir 1000000, bc 4000, be 4000
            target shape rate 1000000
            bandwidth remaining ratio 100 
            Service-policy : child-policy
              Class-map: precedence_0 (match-all)  
                0 packets, 0 bytes
                5 minute offered rate 0 bps, drop rate 0 bps
                Match: ip precedence 0 
                Queueing
                queue limit 64 packets
                (queue depth/total drops/no-buffer drops) 0/0/0
                (pkts output/bytes output) 0/0
                shape (average) cir 500000, bc 2000, be 2000
                target shape rate 500000
                bandwidth remaining ratio 20 
              Class-map: precedence_1 (match-all)  
                0 packets, 0 bytes
                5 minute offered rate 0 bps, drop rate 0 bps
                Match: ip precedence 1 
                Queueing
                queue limit 64 packets
                (queue depth/total drops/no-buffer drops) 0/0/0
                (pkts output/bytes output) 0/0
                shape (average) cir 500000, bc 2000, be 2000
                target shape rate 500000
                bandwidth remaining ratio 40 
              Class-map: precedence_2 (match-all)  
                0 packets, 0 bytes
                5 minute offered rate 0 bps, drop rate 0 bps
                Match: ip precedence 2 
                Queueing
                queue limit 64 packets
                (queue depth/total drops/no-buffer drops) 0/0/0
                (pkts output/bytes output) 0/0
                shape (average) cir 500000, bc 2000, be 2000
                target shape rate 500000
                bandwidth remaining ratio 60 
              Class-map: class-default (match-any)  
                0 packets, 0 bytes
                5 minute offered rate 0 bps, drop rate 0 bps
                Match: any 
                
                queue limit 64 packets
                (queue depth/total drops/no-buffer drops) 0/0/0
                (pkts output/bytes output) 0/0
      

      The following sample output from the show policy-map command indicates that a bandwidth-remaining ratio of 10 is configured on the parent class-default class of the policy map named vlan10_policy.

      Router# show policy-map vlan10_policy
        Policy Map vlan10_policy
          Class class-default
            Average Rate Traffic Shaping
            cir 1000000 (bps)
            bandwidth remaining ratio 10
            service-policy child-policy
      

      The following sample output from the show policy-map command indicates that a bandwidth-remaining ratio of 100 is configured on the parent class-default class of the policy map named vlan20_policy.

      Router# show policy-map vlan20_policy
        Policy Map vlan20_policy
          Class class-default
            Average Rate Traffic Shaping
            cir 1000000 (bps)
            bandwidth remaining ratio 100
            service-policy child-policy
      

      The following sample output from the show policy-map command indicates that bandwidth-remaining ratios of 20, 40, and 60 are configured on the class queues precedence_0, precedence_1, and precedence_2, respectively.

      Router# show policy-map child-policy
        Policy Map child-policy
          Class precedence_0
            Average Rate Traffic Shaping
            cir 500000 (bps)
            bandwidth remaining ratio 20
          Class precedence_1
            Average Rate Traffic Shaping
            cir 500000 (bps)
            bandwidth remaining ratio 40
          Class precedence_2
            Average Rate Traffic Shaping
            cir 500000 (bps)
            bandwidth remaining ratio 60

      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

      Congestion avoidance

      "Congestion Avoidance Overview" module

      Class maps, policy maps, hierarchical policy maps, Modular Quality of Service Command-Line Interface (CLI) (MQC)

      "Applying QoS Features Using the MQC" module

      Traffic shaping, traffic policing

      "Policing and Shaping Overview" 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.

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      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 Distribution of Remaining Bandwidth Using Ratio

      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 www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

      Table 1 Feature Information for Distribution of Remaining Bandwidth Using Ratio

      Feature Name

      Releases

      Feature Information

      MQC--Distribution of Remaining Bandwidth Using Ratio

      Cisco IOS XE Release 2.1

      The Distribution of Remaining Bandwidth Using Ratio feature allows service providers to configure a bandwidth-remaining ratio on subinterfaces and class queues. This ratio specifies the relative weight of a subinterface or queue with respect to other subinterfaces or queues. During congestion, the router uses this bandwidth-remaining ratio to determine the amount of excess bandwidth (unused by priority traffic) to allocate to a class of nonpriority traffic.

      In Cisco IOS XE Release 2.1, this feature was introduced on Cisco ASR 1000 Series Routers.

      The following commands were introduced or modified: bandwidth remaining ratio, show policy-map, show policy-map interface.