YANG Models for Quality of Service (QoS)

YANG Models for Quality of Service (QoS) Aviatrix Systems

2901 Tasman Drive #109 Santa Clara CA 95054 US achoudhary@aviatrix.com

Kloud Services

mjethanandani@gmail.com

Juniper Networks

1194 North Mathilda Avenue Sunnyvale CA 94089 US exa@juniper.net

The MITRE Corporation

ingwherchen@mitre.org

This document describes a YANG model for configuration and operational data of Quality of Service (QoS) in network devices.

This document defines a YANG 1.1 model for Quality of Service (QoS) configuration and statistics parameters. Traffic Policy module defines the basic building blocks to define a classifier, policy and target. QoS Action module defines QoS action related parameters. Traffic policy is augmented to include packet match and action parameters to define the Differentiated Services (DiffServ) policy, Queues policy and Scheduler policy. Each of these policies are defined as separate modules. The DiffServ module is based on DiffServ architecture, and various references have been made to available standard architecture documents. QoS statistics counters are defined in QoS Operational module. DiffServ is a preferred approach for network service providers to offer services to different customers based on their network Quality-of-Service (QoS) objectives. The traffic streams are differentiated based on DiffServ Code Points (DSCP) carried in the IP header of each packet. The DSCP markings are applied by upstream node or by the edge router on entry to the DiffServ network. The YANG modules in this document conform to the Network Management Datastore Architecture (NMDA). Tree diagrams used in this document follow the notation defined in YANG Tree Diagrams.

Note to RFC Editor Editorial Note: (To be removed by RFC Editor) This draft contains several placeholder values that need to be replaced with finalized values at the time of publication. Please apply the following replacements:

"XXXX" --> the assigned RFC value for this draft both in this draft and in the yang modules under the revision statement.
The "revision" date in model, in the format XXXX-XX-XX, needs to be updated with the date the draft gets approved.

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 when, and only when, they appear in all capitals, as shown here.

This document uses definitions and acronyms defined in Definitions of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers, An Architecture for Differentiated Services, and other documents. Here are some of them.

Active Queue Management (AQM): An activity that marks or drops packets before the queue is full.
Behavior Aggregate (BA): A DS behavior aggregate.
Classifier: an entity which selects packets based on the content of packet headers according to defined rules.
DS behavior aggregate: A collection of packets with the same DS codepoint crossing a link in a particular direction.
DS code point: A specific value of the DSCP portion of the DS field, used to select a PHB.
DiffServ: Differentiated Services enhancements to the Internet protocol are intended to enable scalable service discrimination in the Internet without the need for per-flow state and signaling at every hop. A variety of services may be built from a small, well-defined set of building blocks which are deployed in network nodes.
DSCP: Differentiated Services Code Point
ECN: Explicit Congestion Notification
Marking: the process of setting the DS codepoint in a packet based on defined rules; pre-marking, re-marking.
Metering: the process of measuring the temporal properties (e.g., rate) of a traffic stream selected by a classifier. The instantaneous state of this process may be used to affect the operation of a marker, shaper, or dropper, and/or may be used for accounting and measurement purposes.
MF Classifier: A multi-field (MF) classifier which selects packets based on the content of some arbitrary number of header fields; typically some combination of source address, destination address, DS field, protocol ID, source port and destination port.
Per-Hop-Behavior (PHB): The externally observable forwarding behavior applied at a DS-compliant node to a DS behavior aggregate.
Policing: the process of discarding packets (by a dropper) within a traffic stream in accordance with the state of a corresponding meter enforcing a traffic profile.
RED: Random Early Detection
Shaping: the process of delaying packets within a traffic stream to cause it to conform to some defined traffic profile.
Traffic-Group: is a metadata stored in a packet buffer.
WRED: Weighted Random Early Detection

The overall objective of this model design is to offer a base set of modules that can then be further augmented to provide other models, such as Differentiated Services (DiffServ) and Policy Based Routing (PBR). Those models would augment the base modules defined in this draft to define their own model. This document defines one such model, DiffServ. The design also takes into consideration that vendors might want to extend the model to add their own extensions, such as to extend Traffic Policy module, to provide constructs of policy for different QoS functionalities."

QoS Yang Modules Layout ------------- ------------ ------------ ------------ | | | | | | | | | DiffServ | | Queue | | Scheduling | | QoS | | Policy | | Policy | | Policy | | Oper | | | | | | | | | ------------- ------------ ------------ ------------ ------------- ------------------------------------------ | | | | | QoS Action | | Traffic Policy | | | | (Base Policy, Classifier, Target) | | | | | ------------- ------------------------------------------ The above diagram depicts the design of the QoS model. It uses Traffic Policy and QoS Action as base modules, which are augmented by the remaining modules on the top to define different aspects of QoS. The Classifier is defined as part of Traffic Policy Module. A classifier consists of set of filters and an operation that is performed on those filters. Each filter defines a rule on a particular packet header or packet metadata field that dictate how the packet will be classified based on that particular field, e.g. whether it will be classified based on DSCP, or will be classified based on source IPv4 address prefix. The operation defines whether these filters are logically AND or OR. The filters may be based on a combination of values or range of values of different packet header fields or packet metadata fields. An example of how these filter definitions are used can be seen in the DiffServ model. The DiffServ model augments the filter node in the Classifier to add in DiffServ specific filter parameters. One or more packet conditioning functions may be applied to a classifier which may drop, mark, or delay packets. These are defined in the QoS Action module. A set of classifiers with corresponding conditioning functions when arranged in order of priority represent a QoS policy. These policies are defined in Traffic Policy module. The QoS Action module defines marking, metering and queuing. QoS actions are configured in line or referred to in DiffServ, Queuing, and Scheduling Policy modules. A Meter meters each packet and passes the packet and the metering result to the Marker. Meter is modeled based on commonly used algorithms in industry, A Single Rate Three Color Marker (srTCM) , A Two Rate Three Color Marker (trTCM), and A Single Rate Two Color Marker. Different vendors can extend it with other types of meters as well. Meter is defined in QoS Action module. Queue Policy module allows queues to be referred in a policy. The match is based on traffic group and action parameters are used as defined in QoS Action module. Scheduling Policy module defines a set of scheduling parameters and associates Queue Policy with it. QoS counters are defined in QoS Operational module. It includes counters for Classifiers, Meters and Queues associated with a QoS policy applied in each direction of traffic. To modularize and for reusability, grouping have been defined for various counters of Classifier, Meters and Queues. The target is assumed to be interface but the groupings can be used for any other target type where QoS policy is applied.

Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers describes the architecture as a simple model where traffic entering a network is classified and possibly conditioned at the boundary of the network and assigned a different Behavior Aggregate (BA). Each BA is identified by a specific value of DSCP, and is used to select a Per Hop Behavior (PHB). The packet classification policy identifies the subset of traffic which may receive a DiffServ by being conditioned or mapped. Packet classifiers select packets within a stream based on the content of some portion of the packet header. There are two types of classifiers, the BA classifier, and the Multi-Field (MF) classifier which selects packets based on a value which is combination of one or more header fields. In the DiffServ Policy module, this is realized by augmenting the classifier in Traffic Policy module. Traffic conditioning includes metering, shaping and/or marking. A Meter is used to measure the traffic against a given traffic profile. The traffic profile specifies the temporal property of the traffic. A packet that arrives is first determined to be in or out of the profile, which will result in the action of marked, dropped or shaped. This is realized in vendor specific modules based on the parameters defined in action module. The metering parameters are augmented to the QoS policy module when metering is defined inline, and to the metering template when metering profile is referred in policy module.

This document defines support for A Single Rate Three Color Marker (srTCM), which is one of the components in a An Architecture for Differentiated Services. The srTCM meters a traffic stream and marks its packets according to three traffic parameters, Committed Information Rate (CIR), Committed Burst Size (CBS), and Excess Burst Size (EBS), to be either green, yellow, or red. A packet is marked green if it doesn't exceed the CBS, yellow if it does exceed the CBS, but not the EBS, and red otherwise.

This document defines support for A Two Rate Three Color Marker (trTCM), which is one of the components in a An Architecture for Differentiated Services. The trTCM meters a traffic stream and marks its packets according to two rates, Peak Information Rate (PIR), the Committed Information Rate (CIR), and their associated burst sizes to either green, yellow, or red. A packet is marked red if it exceeds the PIR. Otherwise, it is marked yellow or green depending on whether it exceeds or does not exceed the CIR.

Modules defined in this draft import definitions from Common YANG Data Types and A YANG Data Model for Interface Management.

Traffic Policy module contains list of classifiers identified by a classifier name. Each classifier MAY contain a list of filters. This module also contains list of policy objects identified by a policy name and policy type which MUST be provided. Policy-type is of type identity and is populated in a vendor specific manner. With different values of policy types, each vendor MAY define their own construct of policy for different QoS functionalities. Each vendor MAY augment classifier entry in a policy definition with a set of actions. The module also augments A YANG Data Model for Interface Management module to add a target policy. A single policy of a particular policy-type can be applied on an interface in each direction of traffic.

ietf-traffic-policy abridged tree diagram

ietf-traffic-policy module file "ietf-traffic-policy@2023-07-20.yang" module ietf-traffic-policy { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-traffic-policy"; prefix traffic-policy; import ietf-interfaces { prefix if; } import iana-qos-types { prefix qos-types; reference "RFC XXXX: YANG Data Models for Quality of Service (QoS)."; } organization "IETF Routing Area Working Group."; contact "WG Web: WG List: Editor: Aseem Choudhary Editor: Mahesh Jethanandani "; description "This module contains a collection of YANG definitions for configuring QoS Traffic Policies. Copyright (c) 2023 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Revised BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; revision 2023-07-20 { description "Initial version."; reference "RFC XXXX: YANG Models for Quality of Service (QoS)."; } grouping filters { description "Filters types in a Classifier entry."; leaf type { type identityref { base qos-types:filter-type; } description "This leaf defines the type of filter."; } leaf logical-not { type boolean; description "This is logical-not operator for filter values and/or value ranges. When true, it indicates filter looks for absence of values and/or value ranges defined by the filter."; } } grouping generic-classifier-attr { description "Generic Classifier attributes like name, description, operation type."; leaf name { type string; description "A unique name for Classifier entry."; } leaf description { type string; description "Description statement for classifier entry."; } leaf filter-operation { type qos-types:match-operation-type; description "match-any or match-all filters."; } } grouping inline-attr { description "Attributes of inline classifier in a policy."; leaf filter-operation { type qos-types:match-operation-type; description "match-any or match-all filters."; } list filter { key "type logical-not"; uses filters; description "Filters configured inline in a policy."; } } container classifiers { description "List of classifier entries."; list classifier { key "name"; description "Each classifier entry contains a list of filters."; uses generic-classifier-attr; list filter { key "type logical-not"; uses filters; description "Filter entries for a classifier."; } } } container policies { description "List of policy templates."; list policy { key "name type"; description "Policy template."; leaf name { type string; description "A unique name for the policy."; } leaf type { type identityref { base qos-types:policy-type; } description "The type of policy."; } leaf description { type string; description "A description for policy."; } list classifier { key "name"; ordered-by user; description "Classifier configuration in a policy."; leaf name { type string; description "A unique name for classifier entry."; } container inline { presence "This container is present for when the device is configured for inline classification."; uses inline-attr; description "Container for when an inline classification is desired."; } list action { key "type"; ordered-by user; description "List of action for a Classifier."; leaf type { type identityref { base qos-types:action-type; } description "Type of action."; } } } } } augment "/if:interfaces/if:interface" { description "Augments Interface module to add Target Entry."; list qos-target-policy { key "direction type"; description "Policy target for inbound or outbound direction."; leaf direction { type identityref { base qos-types:direction; } description "Direction of the traffic flow either inbound or outbound."; } leaf type { type identityref { base qos-types:policy-type; } description "Policy type."; } leaf name { type string; mandatory true; description "A unique name for the Policy."; } } } }

]]>



      
	QoS Action module includes actions such marking, metering,
	or queuing. Metering, marking, queuing, and scheduling actions
	are realized by augmenting the Traffic Policy module. Marking
	sets DiffServ codepoint value in the classified
	packet.

	
	  ietf-qos-actions abridged tree diagram
          
	

        
	  ietf-qos-actions module
          file "ietf-qos-action@2023-07-20.yang"
module ietf-qos-action { 
  yang-version 1.1;
  namespace "urn:ietf:params:xml:ns:yang:ietf-qos-action";
  prefix qos-action;

  import ietf-inet-types {
    prefix inet;
    reference
      "RFC 6991: Common YANG Data Types";
  }
  import iana-qos-types {
    prefix qos-types;
    reference
      "RFC XXXX: YANG Model for QoS";
  }

  organization
    "IETF Routing Area Working Group";

  contact
    "WG Web:   
     WG List:  

     Editor:   Aseem Choudhary
               
     Editor:   Mahesh Jethanandani
               ";

  description
    "This module contains a collection of YANG definitions for
     configuring QoS actions.

     Copyright (c) 2023 IETF Trust and the persons identified as
     authors of the code.  All rights reserved.

     Redistribution and use in source and binary forms, with or
     without modification, is permitted pursuant to, and subject
     to the license terms contained in, the Revised BSD License
     set forth in Section 4.c of the IETF Trust's Legal Provisions
     Relating to IETF Documents
     (http://trustee.ietf.org/license-info).

     This version of this YANG module is part of RFC XXXX; see
     the RFC itself for full legal notices.";

  revision 2023-07-20 {
    description
      "Initial version";
    reference
      "RFC XXXX: YANG Models for Quality of Service (QoS).";
  }

  grouping rate-value-unit {
    leaf value {
      type uint64;
      description
        "Value for the rate that is configured, either in
         bits-per-second or percentage.";
    }

    leaf unit {
      type identityref {
        base qos-types:rate-unit-type;
      }
      default qos-types:bits-per-second;
      description
        "The unit for the value above, either in bits-per-second or
         percentage.";
    }
    description
      "Grouping for configuration of value and unit.";
  }

  grouping meter-action {
    description
      "Configuration of meter actions.";

    leaf action-type {
      type identityref {
        base qos-types:meter-action-type;
      }
      description
        "Action type for metering.";
    }

    leaf dscp-mark {
      type inet:dscp;
      must "../action-type = 'qos-types:action-mark'" {
        error-message
          "DSCP must be marked when action-type is action-mark.";
      }
      description
        "DSCP marking";
    }

    leaf traffic-group-mark {
      type string;
      must "../action-type = 'qos-types:action-mark'" {
        error-message
          "Traffic-group must be marked when action-type is
           action-mark.";
      }
      description
        "A unique name to mark as a traffic group.";
    }
  }

  grouping single-rate-two-color-meter {
    container single-rate-two-color-meter {
      description
        "A container for Basic Single Rate Two Color Marker.";

      leaf committed-information-rate {
        type uint64;
        units "bytes-per-second";
        description
          "The value for Committed Information Rate (CIR).";
      }

      leaf committed-burst-size {
        type uint64;
        units "bytes";
        description
          "The value for Committed Burst Size (CBS).";
      }

      container conform-action {
        uses meter-action;
        description
          "A packet is marked conforming, or green if it does not
           exceed CIR.";
      }

      container exceed-action {
        uses meter-action;
        description
          "A packet is marked exceeding, or yellow if it does
           exceed CIR.";
      }
    }
    description
      "A Basic Single Rate Two Color Meter.";
  }

  grouping single-rate-three-color-meter {
    container single-rate-three-color-meter {
      description
        "Container that defines the Single Rate Three Color Meter
         (srTCM).";

      leaf committed-information-rate {
        type uint64;
        units "bytes-per-second";
        description
          "The value for Committed Information Rate (CIR).";
        reference
          "RFC 2697: A Single Rate Three Color Marker.";
      }

      leaf committed-burst-size {
        type uint64;
        units "bytes";
        description
          "The value for Committed Burst Size (CBS).";
        reference
          "RFC 2697: A Single Rate Three Color Marker.";
      }

      leaf excess-burst-size {
        type uint64;
        units "bytes";
        description
          "The value for Excess Burst Size (EBS).";
        reference
          "RFC 2697: A Single Rate Three Color Marker.";
      }

      container conform-action {
        uses meter-action;
        description
          "A packet is marked conforming, or green if it does not
           exceed CBS.";
        reference
          "RFC 2697: A Single Rate Three Color Marker.";
      }

      container exceed-action {
        uses meter-action;
        description
          "A packet is marked exceeding, or yellow if it does
           exceed CBS, but not the EBS.";
        reference
          "RFC 2697: A Single Rate Three Color Marker.";
      }

      container violate-action {
        uses meter-action;
        description
          "A packet is marked violating, or red if it is exceeds
           both CBS and EBS.";
        reference
          "RFC 2697: A Single Rate Three Color Marker.";
      }
    }
    description
      "Singe Rate Three Color Meter (srTCM).";
    reference
      "RFC 2697: A Single Rate Three Color Marker.";
  }

  grouping two-rate-three-color-meter {
    container two-rate-three-color-meter {
      description
        "A container that defines A Two Rate Three Color Meter
         (trTCM).";

      leaf committed-information-rate {
        type uint64;
        units "bytes-per-second";
        description
          "The value for Committed Information Rate (CIR).";
        reference
          "RFC 2698: A Two Rate Three Color Marker.";
      }

      leaf committed-burst-size {
        type uint64;
        units "bytes";
        description
          "The value for Committed Burst Size (CBS).";
        reference
          "RFC 2698: A Two Rate Three Color Marker.";
      }

      leaf peak-information-rate {
        type uint64;
        units "bytes-per-second";
        description
          "The value for Peak Information Rate (PIR).";
        reference
          "RFC 2698: A Two Rate Three Color Marker.";
      }

      leaf peak-burst-size {
        type uint64;
        units "bytes";
        description
          "The value for Peak Burst Size (PBS).";
        reference
          "RFC 2698: A Two Rate Three Color Marker.";
      }

      container conform-action {
        uses meter-action;
        description
          "A packet is marked conforming, or green, if it does not
           exceed CIR.";
        reference
          "RFC 2698: A Two Rate Three Color Marker.";
      }

      container exceed-action {
        uses meter-action;
        description
          "A packet is marked exceeding, or yellow, if it exceeds
           CIR but not PIR.";
        reference
          "RFC 2698: A Two Rate Three Color Marker.";
      }

      container violate-action {
        uses meter-action;
        description
          "A packet is marked as violating, or red, if it exceeds
           both CIR and PIR.";
        reference
          "RFC 2698: A Two Rate Three Color Marker.";
      }
    }
    description
      "Container for a Two Rate Three Color Marker.";
  }

  grouping meter {
    choice meter-types {
      case single-rate-two-color-meter-type {
        uses single-rate-two-color-meter;
      }

      case single-rate-three-color-meter-type {
        uses single-rate-three-color-meter;
      }

      case two-rate-three-color-meter-type {
        uses two-rate-three-color-meter;
      }
      description
        "A meter action based on choice of meter action type.";
    }
    description
      "Meter attributes.";
  }

  container meters {
    description
      "List of meter templates.";

    list meter {
      key "name";
      description
        "Meter entry template.";

      leaf name {
        type string;
        description
          "A unique string to identify the meter.";
      }
      uses meter;
    }
  }

  grouping meter-reference {
    container meter {
      leaf name {
        type string ;
        mandatory true;    
        description
          "This leaf defines name of the meter referenced.";
      }

      leaf type {
        type identityref {
          base qos-types:meter-type;
        }
        mandatory true;    
        description
          "This leaf defines type of the meter.";
      }
      description
        "The name and type for meter reference.";
    }
    description
      "Grouping to define meter reference.";
  }

  grouping count {
    container count {
    if-feature qos-types:count;

      leaf count-action {
        type empty;
        description
          "Take an action if this is defined.";
      }
      description
        "Container for whether to take an action for count.";
    }
    description
      "The count action grouping.";
  }

  grouping named-counter {
    container named-counter {
    if-feature qos-types:named-counter;
      leaf count-name-action {
        type string;
        description
          "A unique name for named counter.";
      }
      description
        "The named counter action.";
    }
    description
      "The named counter action grouping.";
  }

  grouping discard {
    container discard {
      leaf discard {
        type empty;
        description
          "If defined this enables discard action.";
      }
      description
        "Container for discard action.";
    }
    description
      "Grouping for discard action.";
  }

  grouping priority {
    container priority {
      leaf level {
        type uint8;
        description
          "Priority level.";
      }
      description
        "Container for priority.";
    }
    description
      "Grouping for priority.";
  }

  grouping min-rate {
    container min-rate {
      uses rate-value-unit;
      description
        "Minimum guaranteed bandwidth.";
    }
    description
      "Grouping for minimum rate.";
  }

  grouping dscp-marking {
    container dscp {
      leaf dscp {
        type inet:dscp;
        description
          "DSCP marking.";
      }
      description
        "Container for DSCP marking.";
    }
    description
      "Grouping for DSCP marking.";
  }

  grouping traffic-group-marking {
    container traffic-group {
      leaf traffic-group {
        type string;
        description
          "A unique name for traffic group.";
      }
      description
        "Container for traffic group marking container.";
    }
    description
      "Grouping for traffic group marking.";
  }

  grouping child-policy {
    container child-policy {
      if-feature qos-types:child-policy;
      leaf name {
        type string;
        description
          "A unique name for hierarchical policy.";
      }
      description
        "Hierarchical Policy configuration container.";
    }
    description
      "Grouping of Hierarchical Policy configuration.";
  }

  grouping max-rate {
    container max-rate {
      uses rate-value-unit;

      leaf burst-value {
        type uint64;
        description
          "Burst value in bytes.";
      }

      leaf burst-unit {
        type identityref {
          base qos-types:burst-unit-type;
        }
        default qos-types:bytes;
        description
          "Burst value in bytes or milliseconds, with a default
           of bytes.";
      }
      description
        "Maximum rate attributes container.";
    }
    description
      "Grouping for maximum rate attributes.";
  }

  grouping red-config-parameters {
    leaf min-threshold-val {
      type uint64;
      description
        "Minimum value of RED threshold.";
    }

    leaf min-threshold-unit {
      type identityref {
        base qos-types:red-threshold-unit;
      }
      default qos-types:red-threshold-bytes;
      description
        "The unit for minimum RED threshold value, with the default
         of bytes.";
    }

    leaf max-threshold-val {
      type uint64;
      description
        "Maximum value of RED threshold.";
    }

    leaf max-threshold-unit {
      type identityref {
        base qos-types:red-threshold-unit;
      }
      default qos-types:red-threshold-bytes;
      description
        "The unit for maximum RED threshold value, with the default
         of bytes.";
    }

    leaf weight {
      type uint8;
      description
        "The decay factor for the average queue size
         calculation. The numbers is a 2's exponent.";
    }

    leaf max-probability-val {
      type uint64;
      description
        "Value of maximum probability value. This value need
         be interpreted along with max-probability-unit";
    }

    leaf max-probability-unit {
      type identityref {
        base qos-types:probability-unit;
      }
      default qos-types:probability-pc;
      description
       "Probability unit type, with a default of percentage.";
    }
    description
      "Random Early Detect (RED) configuration parameters.";
  }

  grouping queue {
    container queue {
      uses priority;
      uses min-rate;
      uses max-rate;
      container algorithmic-drop {
        choice drop-algorithm {
          case tail-drop {
            container tail-drop {
              leaf tail-drop {
                type empty;
                description
                  "When defined, tail drop algorithm is enabled.";
              }
              description
                "Tail Drop configuration container.";
            }
            description
              "Tail Drop choice.";
          }

          case red {
            container red {
              uses red-config-parameters;
              leaf ecn-enabled {
                type boolean;
                default "false";
                description
                  "ECN is enabled on the queue.";
              }
              description
                "Random Early Detect (RED) configuration.";
            }
          }

          case wred {
            container wred {
              list wred {
                key "profile";

                leaf profile {
                  type uint8;
                  description
                    "Profile id of each WRED profile.";
                }

                leaf color-type {
                  type identityref {
                    base qos-types:wred-color-type;
                  }
                  default qos-types:wred-color-dscp;
                  description
                    "WRED color-type of each profile.";
                }

                list color-val {
                  key "min max";

                  leaf min {
                    type uint8;
                    description
                      "Minimum value of color types.";
                  }

                  leaf max {
                    type uint8;
                    description
                      "Maximum value of color types.";
                  }
                  description
                    "List of color markings which constitute
                     a traffic profile.";
                }
                uses red-config-parameters;
                description
                  "List of RED profiles each with its own
                   threshold values.";
              }

              leaf ecn-enabled {
                type boolean;
                default "false";
                description
                  "ECN is enabled on the queue.";
              }
              description
                "Weighted Random Early Detect (WRED) configuration.";
            }
          }
          description
            "Choice of Drop Algorithm.";
        }
        description
          "Algorithmic Drop configuration container.";
      }
      description
        "Queue configuration container.";
    }
    description
      "Queue grouping.";
  }

  container queues {
    description
      "List of queue templates.";
               
    list queue {
      key "name";
      description
        "Queue entry template.";
    
      leaf name {
        type string;
        description
          "A unique name identifying this queue template";
      }
      uses queue;
    }
  }

  grouping queue-reference {
    container queue-reference {
      leaf queue-name {
        type string;
        mandatory true;
        description
          "This leaf defines name of the  queue template
           referenced.";
      }
      description
        "Queue template reference.";
    }
    description
      "Queue template reference grouping.";
  }

  grouping scheduler {
    container scheduler {
      uses min-rate;
      uses max-rate;
      description
        "Scheduler configuration container.";
    }
    description
      "Scheduler configuration grouping.";
  }
}
	  
	  ]]>
        

      


      
	DiffServ module augments Traffic Policy module to enable
  diffrentiated services for different types of packets.

	
	  ietf-diffserv abridged tree diagram
          
	

        
	  ietf-diffserv module
          file "ietf-diffserv@2023-07-20.yang"
module ietf-diffserv {
  yang-version 1.1;
  namespace "urn:ietf:params:xml:ns:yang:ietf-diffserv";
  prefix diffserv;

  import ietf-traffic-policy {
    prefix traffic-policy;
  }
  import ietf-qos-action {
    prefix qos-action;
  }
  import ietf-inet-types {
    prefix inet;
  }
  import iana-qos-types {
    prefix qos-types;
    reference
      "RFC XXXX: YANG Models for Quality of Service (QoS).";
  }

  organization
    "IETF Routing Area Working Group";

  contact
    "WG Web:   
     WG List:  

     Editor:   Aseem Choudhary
               
     Editor:   Mahesh Jethanandani
               ";

  description
    "This module contains a collection of YANG definitions for
     configuring DiffServ specification implementations.

     Copyright (c) 2023 IETF Trust and the persons identified as
     authors of the code.  All rights reserved.

     Redistribution and use in source and binary forms, with or
     without modification, is permitted pursuant to, and subject
     to the license terms contained in, the Revised BSD License
     set forth in Section 4.c of the IETF Trust's Legal Provisions
     Relating to IETF Documents
     (http://trustee.ietf.org/license-info).

     This version of this YANG module is part of RFC XXXX; see
     the RFC itself for full legal notices.";

  revision 2023-07-20 {
    description
      "Initial version.";
    reference
      "RFC XXXX: A YANG Model for Quality of Service (QoS).";
  }

  grouping dscp {
    list dscp {
      key "min max";
      description
        "List of DSCP ranges.";
      leaf min {
        type inet:dscp;
        description
          "Minimum value of DSCP min-max range.";
      }
      leaf max {
        type inet:dscp;
        must ". >= ../min" {
          error-message
          "max must be greater than or equal to min.";
        }
        description
          "Maximum value of DSCP min-max range.";
      }
    }
    description
      "Filter grouping containing list of DSCP ranges.";
  }

  grouping source-ipv4-prefix {
    list source-ipv4-prefix {
      key "prefix";
      description
        "List of source IPv4 prefixes.";
      leaf prefix {
        type inet:ipv4-prefix;
        description
          "Source IPv4 prefix.";
      }
    }
    description
      "Filter grouping containing list of source IPv4 prefixes.";
  }

  grouping destination-ipv4-prefix {
    list destination-ipv4-prefix {
      key "prefix";
      description
        "List of destination IPv4 prefixes.";
      leaf prefix {
        type inet:ipv4-prefix;
        description
          "Destination IPv4 prefix.";
      }
    }
    description
      "Filter grouping containing list of destination IPv4
       prefixes.";
  }

  grouping source-ipv6-prefix {
    list source-ipv6-prefix {
      key "prefix";
      description
        "List of source IPv6 prefixes.";
      leaf prefix {
        type inet:ipv6-prefix;
        description
          "Source IPv6 prefix.";
      }
    }
    description
      "Filter grouping containing list of source IPv6
       prefixes.";
  }

  grouping destination-ipv6-prefix {
    list destination-ipv6-prefix {
      key "prefix";
      description
        "List of destination IPv6 prefixes.";
      leaf prefix {
        type inet:ipv6-prefix;
        description
          "Destination IPv6 prefix.";
      }
    }
    description
      "Filter grouping containing list of destination IPv6
       prefixes.";
  }

  grouping source-port {
    list source-port {
      key "min max";
      description
        "List of ranges of source port.";

      leaf min {
        type inet:port-number;
        description
          "Minimum value of source port range.";
      }

      leaf max {
        type inet:port-number;
        must ". >= ../min" {
          error-message
          "max must be greater than or equal to min.";
        }
        description
          "Maximum value of source port range.";
      }
    }
    description
      "Filter grouping containing list of source port ranges.";
  }

  grouping destination-port {
    list destination-port {
      key "min max";
      description
        "List of min-max range of destination ports.";
      leaf min {
        type inet:port-number;
        description
          "Minimum value of destination port.";
      }
      leaf max {
        type inet:port-number;
        must ". >= ../min" {
          error-message
          "max must be greater than or equal to min.";
        }
        description
          "Maximum value of destination port range.";
      }
    }
    description
      "Filter grouping containing list of destination port ranges.";
  }

  grouping protocol {
    list protocol {
      key "min max";
      description
        "List of ranges of protocol values. Protocol refers to the
         value in the protocol field of the IPv4 header and value
         in the 'next-header' field of IPv6 header. In IPv6 header,
         'next-header' field indicates first extension header or the
          protocol in the 'upper-layer' header.";
      reference
        "RFC 791: Internet Protocol
         RFC 8200: Internet Protocol, Version 6 (IPv6)
                   Specification.";

      leaf min {
        type uint8 {
          range "0..255";
        }
        description
          "Minimum value of protocol range.";
      }

      leaf max {
        type uint8 {
          range "0..255";
        }
        must ". >= ../min" {
          error-message
          "max must be greater than or equal to min.";
        }
        description
          "Maximum value of protocol range.";
      }
    }
    description
      "Filter grouping containing list of protocol ranges.";
  }

  grouping traffic-group {
    container traffic-group {
      leaf name {
        type string ;
        description
          "This leaf defines name of the traffic group referenced.";
      }
    description
      "Traffic group container.";
    }
    description
      "Traffic group grouping.";
  }

  grouping filter-match-all {
    container match-all {
      leaf action {
        type empty;
        description
          "When set, the filter matches all packets.";
      }
      description
        "The match all action.";
    }
    description
      "The match all filter grouping.";
  }

  augment "/traffic-policy:classifiers/traffic-policy:classifier" + 
          "/traffic-policy:filter" {
    choice filter-param {
      description
        "Choice of filter types.";
      case dscp {
        uses dscp;
        description
          "Filter containing list of DSCP ranges.";
      }

      case source-ipv4-prefix {
        uses source-ipv4-prefix;
        description
          "Filter containing list of source IPv4 prefixes.";
      }

      case destination-ipv4-prefix {
        uses destination-ipv4-prefix;
        description
          "Filter containing list of destination IPv4 prefix.";
      }

      case source-ipv6-prefix {
        uses source-ipv6-prefix;
        description
          "Filter containing list of source IPv6 prefixes.";
      }

      case destination-ipv6-prefix {
        uses destination-ipv6-prefix;
        description
          "Filter containing list of destination IPv6 prefix.";
      }

      case source-port {
        uses source-port;
        description
          "Filter containing list of source-port ranges.";
      }

      case destination-port {
        uses destination-port;
        description
          "Filter containing list of destination-port ranges.";
      }

      case protocol {
        uses protocol;
        description
          "Filter Type Protocol.";
      }

      case traffic-group {
        uses traffic-group;
        description
          "Filter Type traffic-group.";
      }

      case filter-match-all {
        uses filter-match-all;
        description
          "When the filter type is set to match all packets.";
      }
    }
    description
      "Augments QoS classifier to add in DiffServ filters.";
  }

  augment "/traffic-policy:policies/traffic-policy:policy" +
          "/traffic-policy:classifier/traffic-policy:inline" +
          "/traffic-policy:filter" {
    when "derived-from-or-self(../../../traffic-policy:type, " +
         "'qos-types:ipv4-diffserv-policy-type') or " +
         "derived-from-or-self(../../../traffic-policy:type, " +
         "'qos-types:ipv6-diffserv-policy-type') or " +
         "derived-from-or-self(../../../traffic-policy:type, " +
         "'qos-types:diffserv-policy-type')" {
      description
        "If policy type is v4, v6 or default DiffServ,
         this filter can be used.";
    }
    choice filter-params {
      description
        "Choice of action types.";
      case dscp {
        uses dscp;
        description
          "Filter containing list of DSCP ranges.";
      }

      case source-ipv4-prefix {
        when "derived-from-or-self(/traffic-policy:policies/" +
             "traffic-policy:policy/traffic-policy:type, " +
             "'qos-types:ipv6-diffserv-policy-type')" {
            description
               "If policy type is v6, this filter cannot be used.";
        }
        uses source-ipv4-prefix;
        description
          "Filter containing list of source IPv4 prefixes.";
      }

      case destination-ipv4-prefix {
        when "derived-from-or-self(/traffic-policy:policies" +
             "/traffic-policy:policy/traffic-policy:type, " +
             "'qos-types:ipv6-diffserv-policy-type')" {
            description
               "If policy type is v6, this filter cannot be used.";
        }
        uses destination-ipv4-prefix;
        description
          "Filter containing list of destination IPv4 prefix.";
      }

      case source-ipv6-prefix {
        when "derived-from-or-self(/traffic-policy:policies" +
             "/traffic-policy:policy/traffic-policy:type, "+
             "'qos-types:ipv4-diffserv-policy-type')" {
            description
               "If policy type is v4, this filter cannot be used.";
        }
        uses source-ipv6-prefix;
        description
          "Filter containing list of source IPv6 prefixes.";
      }

      case destination-ipv6-prefix {
        when "derived-from-or-self(/traffic-policy:policies" +
             "/traffic-policy:policy/traffic-policy:type, " +
             "'qos-types:ipv4-diffserv-policy-type')" {
            description
               "If policy type is v4, this filter cannot be used.";
        }
        uses destination-ipv6-prefix;
        description
          "Filter containing list of destination IPv6 prefix.";
      }

      case source-port {
        uses source-port;
        description
          "Filter containing list of source-port ranges.";
      }

      case destination-port {
        uses destination-port;
        description
          "Filter containing list of destination-port ranges.";
      }

      case protocol {
        uses protocol;
        description
          "Filter Type Protocol.";
      }

      case traffic-group {
        uses traffic-group;
        description
          "Filter Type traffic-group.";
      }

      case filter-match-all {
        uses filter-match-all;
        description
          "When the filter type is set to match all packets.";
      }
    }
    description
      "Augments Diffserv Classifier with common filter types.";
  }

  augment "/traffic-policy:policies/traffic-policy:policy/" +
          "traffic-policy:classifier/traffic-policy:action" {
    when "derived-from-or-self(../../traffic-policy:type, " +
         "'qos-types:ipv4-diffserv-policy-type') or " +
         "derived-from-or-self(../../traffic-policy:type, " +
         "'qos-types:ipv6-diffserv-policy-type') or " +
         "derived-from-or-self(../../traffic-policy:type, " +
         "'qos-types:diffserv-policy-type')" {
      description
        "If policy type is v4, v6 or default DiffServ,
         these actions can be used.";
    }
    description
      "Augments Diffserv Policy with action configuration.";

    choice action-params {
      description
        "Choice of different action parameters that can be taken.";

      case dscp-marking {
        uses qos-action:dscp-marking;
      }

      case meter-inline {
        uses qos-action:meter;
      }

      case meter-reference {
        uses qos-action:meter-reference;
      }

      case traffic-group-marking {
        uses qos-action:traffic-group-marking;
      }

      case child-policy {
        if-feature qos-types:child-policy;
        uses qos-action:child-policy;
      }

      case count {
        if-feature qos-types:count;
        uses qos-action:count;
      }

      case named-count {
        if-feature qos-types:named-counter;
        uses qos-action:named-counter;
      }

      case queue-inline {
        uses qos-action:queue;
      }

      case scheduler-inline {
        uses qos-action:scheduler;
      }
    }
  }
}
	  
	  ]]>
        

      


      
	QoS Operational module contains all operational
	statistics. It contains statistics related to classifier,
	metering, queueing, and named.

	Classifier statistics consist of list of classifier entries
	identified by a classifier entry name.  Classifier counters
	include matched packets and bytes, and average rate of traffic
	matching a particular classifier.

	Metering statistics consist of meters identified by an
	identifier.  Metering counters include conform, exceed,
	violate, drop packets, and bytes.

	Queuing counters include instantaneous, peak, average queue
	length, as well as output conform, exceed, tail drop packets
	and bytes.

	Named statistics is defined as statistics which is tagged
	by a name.  This could be aggregated or non-aggregated.
	Aggregated named statistics is defined as counters which are
	aggregated across classifier entries in a policy applied to an
	interface in a particular direction.  Non-aggregated named
	statistics are counters of classifier, metering or queuing
	which have the same tag name but maintained separately.

	A clear action is provided to clear all statistics
  or statistics of a particular kind.

	
	  ietf-qos-oper abridged tree diagram
          
	
        
	  ietf-qos-oper module
          file "ietf-qos-oper@2023-07-20.yang"
module ietf-qos-oper {
  yang-version 1.1;
  namespace "urn:ietf:params:xml:ns:yang:ietf-qos-oper";
  prefix qos-oper;

  import ietf-yang-types {
    prefix yang;
    reference
      "RFC 6991:Common YANG Data Types.";
  }
  import ietf-interfaces {
    prefix if;
    reference
      "RFC8343: A YANG Data Model for Interface Management.";
  }
  import iana-qos-types {
    prefix qos-types;
    reference
      "RFC XXXX: YANG Models for Quality of Service (QoS).";
  }


  organization "IETF RTG (Routing Area) Working Group.";

  contact
    "WG Web:   
     WG List:  
     Editor:   Aseem Choudhary
               
     Editor:   Mahesh Jethanandani
               ";
  description
    "This module contains a collection of YANG definitions for
     QoS operational specification.

     Copyright (c) 2023 IETF Trust and the persons identified as
     authors of the code.  All rights reserved.

     Redistribution and use in source and binary forms, with or
     without modification, is permitted pursuant to, and subject
     to the license terms contained in, the Revised BSD License
     set forth in Section 4.c of the IETF Trust's Legal Provisions
     Relating to IETF Documents
     (http://trustee.ietf.org/license-info).

     This version of this YANG module is part of RFC XXXX; see
     the RFC itself for full legal notices.";

  revision 2023-07-20 {
    description
      "Initial version.";
    reference
      "RFC XXXX: YANG Models for Quality of Service (QoS).";
  }

  grouping classifier-statistics {
    description
      "Statistics for a classifier.";

    leaf name {
      type string;
      description
        "A unique identifier for Classifier name.";
    }

    leaf classified-pkts {
      type yang:zero-based-counter64;
      description
        "Number of total packets filtered for a classifier.";
    }

    leaf classified-bytes {
      type yang:zero-based-counter64;
      description
        "Number of total bytes filtered for a classifier.";
    }

    leaf classified-rate {
      type yang:gauge64;
      units "bits-per-second";
      description
        "Rate of average data flow through a classifier.";
    }
  }

  grouping queuing-stats {
    description
      "Statistics for a queue.";

    leaf queue-id {
      type string;
      description
        "A unique identifier for the Queue.";
    }

    leaf transmit-pkts {
      type yang:zero-based-counter64;
      description
        "Number of packets transmitted from queue.";
    }

    leaf transmit-bytes {
      type yang:zero-based-counter64;
      description
        "Number of bytes transmitted from queue.";
    }

    leaf queue-current-size-bytes {
      type yang:gauge64;
      description
        "Number of bytes currently buffered.";
    }

    leaf queue-average-size-bytes {
      type yang:gauge64;
      description
        "Average queue size in number of bytes.";
    }

    leaf queue-peak-size-bytes {
      type yang:gauge64;
      description
        "Peak buffer queue size in bytes.";
    }

    leaf tail-drop-pkts {
      type yang:zero-based-counter64;
      description
        "Total number of packets tail-dropped.";
    }

    leaf tail-drop-bytes {
      type yang:zero-based-counter64;
      description
        "Total number of bytes tail-dropped.";
    }

    leaf red-drop-pkts {
      type yang:zero-based-counter64;
      description
        "Total number of packets dropped because of RED.";
    }

    leaf red-drop-bytes {
      type yang:zero-based-counter64;
      description
        "Total number of bytes dropped because of RED.";
    }

    leaf red-ecn-marked-pkts {
      type yang:zero-based-counter64;
      description
        "Total number of packets that were marked with ECN
         because of RED.";
    }

    leaf red-ecn-marked-bytes {
      type yang:zero-based-counter64;
      description
        "Total number of bytes that were marked with ECN because of
         RED.";
    }

    list wred-stats {
      config false;
      description
        "QoS WRED statistics.";

      leaf profile {
        type uint8;
        description
          "Profile identifier for each color of traffic.";
      }

      leaf drop-pkts {
        type yang:zero-based-counter64;
        description
          "Total number of packets dropped because of WRED.";
      }

      leaf drop-bytes {
        type yang:zero-based-counter64;
        description
          "Total number of bytes dropped because of WRED.";
      }

      leaf ecn-marked-pkts {
        type yang:zero-based-counter64;
        description
          "Total number of packets that were marked with ECN because
           of WRED.";
      }

      leaf ecn-marked-bytes {
        type yang:zero-based-counter64;
        description
          "Total number of bytes that were marked with ECN because of
           WRED.";
      }
    }
  }

  grouping metering-stats {
    description
      "Statistics for a meter.";

    leaf meter-id {
      type string;
      description
        "A unique identifier that identifies this set of metering
         statistics.";
    }

    leaf conform-pkts {
      type yang:zero-based-counter64;
      description
        "Number of packets that conform to the rate and burst.";
    }

    leaf conform-bytes {
      type yang:zero-based-counter64;
      description
        "Total bytes count that conform to the rate and burst.";
    }

    leaf conform-rate {
      type yang:gauge64;
      units "bits-per-second";
      description
        "Traffic Rate measured as conformimg.";
    }

    leaf exceed-pkts {
      type yang:zero-based-counter64;
      description
        "Number of packets that exceed the peak rate and peak
         burst.";
    }

    leaf exceed-bytes {
      type yang:zero-based-counter64;
      description
        "Total number of bytes which exceed the peak rate and peak
         burst.";
    }

    leaf exceed-rate {
      type yang:gauge64;
      units "bits-per-second";
      description
        "Traffic Rate measured as exceeding.";
    }

    leaf violate-pkts {
      type yang:zero-based-counter64;
      description
        "Number of packets that were beyond peak rate
         and peak burst.";
    }

    leaf violate-bytes {
      type yang:zero-based-counter64;
      description
        "Total number of bytes which were beyond peak rate and
         peak burst.";
    }

    leaf violate-rate {
      type yang:gauge64;
      units "bits-per-second";
      description
        "Traffic Rate measured as violating.";
    }

    leaf drop-pkts {
      type yang:zero-based-counter64;
      description
        "Number of packets dropped by meter.";
    }

    leaf drop-bytes {
      type yang:zero-based-counter64;
      description
        "Number of bytes dropped by meter.";
    }
  }

  augment "/if:interfaces/if:interface" {
    description
      "Augments interface module to add QoS Target entry.";

    container qos-interface-statistics {
      config false;
      description
        "QoS Interface statistics.";

      list stats-per-direction {
        description
          "QoS interface statistics in ingress or egress direction.";

        leaf direction {
          type identityref {
            base qos-types:direction;
          }
          description
            "Direction of the traffic flow. Either ingress or
             egress.";
        }

        leaf policy-name {
          type string;
          description
            "Policy name for single level policy as well as
             for Hierarchical policies. For Hierarchical policies,
             this represent relative path as well as the last level
             policy name.";
        }

        list classifier {
          description
            "Statistics for each Classifier in a
             Policy applied in a particular direction.";
          uses classifier-statistics;
        }

        list named {
          description
            "Statistics for a statistics-name.";

          leaf name {
            type string;
            description
              "A name for statistics.";
          }

          container aggregated {
            description
              "Matched aggregated statistics for a statistics-name.";

            leaf pkts {
              type yang:zero-based-counter64;
              description
                "Number of total matched packets associated
                 with a statistics name.";
            }

            leaf bytes {
              type yang:zero-based-counter64;
              description
                "Number of total matched bytes associated
                 with a statistics name.";
            }

            leaf rate {
              type yang:gauge64;
              units "bits-per-second";
              description
                "Rate of average matched data which is associated
                 to a statistics name.";
            }
          }

          container non-aggregated {
            description
              "Statistics for non-aggregated statistics-name.";

            list classifier {
              description
                "Statistics for each Classifier in a
                 Policy applied in a particular direction.";
              uses classifier-statistics;
            }

            list metering {
              description
                "Statistics for each Meter associated with
                 the Policy.";
              reference
                "RFC2697: A Single Rate Three Color Marker
                 RFC2698: A Two Rate Three Color Marker.";
              uses metering-stats;
            }

            list queueing {
              description
                "Statistics for each Queue associated with
                 the Policy.";
              uses queuing-stats;
            }
          }
        }

        list metering {
          description
            "Statistics for each Meter associated with the Policy.";
          reference
            "RFC2697: A Single Rate Three Color Marker
             RFC2698: A Two Rate Three Color Marker.";
          uses metering-stats;
        }

        list queueing {
          description
            "Statistics for each Queue associated with the Policy.";
          uses queuing-stats;
        }
      }

      action clear {
        description
          "Clear statistics action command. Execution of this command
           should result in all the QoS interface counters to be
           cleared and set to 0.";

        input {
          leaf category {
            type identityref {
              base qos-types:clear-counters-type;
            }
            description
              "Category of counters which is being cleared.";
          }

          leaf started-at {
            type yang:date-and-time;
            description
              "The date and time when the counters should be
               cleared.";
          }
        }

        output {
          leaf finished-at {
            type yang:date-and-time;
            description
              "The date and time when the counters finished
               clearing.";
          }
        }
      }
    }
  }
}
	  
	  ]]>
        

      


      
	 Scheduling Policy module defines a set of scheduling
	parameters and associates a Queue Policy with it.
	
	  ietf-scheduler-policy abridged abridged tree diagram
          
	
        
	  ietf-scheduler-policy module
          file "ietf-scheduler-policy@2023-07-20.yang"
module ietf-scheduler-policy {
  yang-version 1.1;
  namespace "urn:ietf:params:xml:ns:yang:ietf-scheduler-policy";
  prefix scheduler-policy;

  import ietf-traffic-policy {
    prefix traffic-policy;
  }
  import ietf-qos-action {
    prefix qos-action;
  }
  import ietf-diffserv {
    prefix diffserv;
  }
  import iana-qos-types {
    prefix qos-types;
    reference
      "RFC XXXX: YANG Models for Quality of Service (QoS).";
  }

  organization
    "IETF Routing Area Working Group.";

  contact
    "WG Web:   
     WG List:  

     Editor:   Aseem Choudhary
               
     Editor:   Mahesh Jethanandani
               ";

  description
    "This module contains a collection of YANG definitions for
     configuring QoS scheduler policies.

     Copyright (c) 2023 IETF Trust and the persons identified as
     authors of the code.  All rights reserved.

     Redistribution and use in source and binary forms, with or
     without modification, is permitted pursuant to, and subject
     to the license terms contained in, the Revised BSD License
     set forth in Section 4.c of the IETF Trust's Legal Provisions
     Relating to IETF Documents
     (http://trustee.ietf.org/license-info).

     This version of this YANG module is part of RFC XXXX; see
     the RFC itself for full legal notices.";

  revision 2023-07-20 {
    description
      "Initial version.";
    reference
      "RFC XXXX: YANG Models for Quality of Service (QoS).";
  }

  augment "/traffic-policy:policies/traffic-policy:policy" +
          "/traffic-policy:classifier/traffic-policy:inline" +
          "/traffic-policy:filter" {
    when "derived-from-or-self(../../../traffic-policy:type, " +
         "'qos-types:scheduler-policy-type')" {
      description
        "This filter can be used only when policy type is
         scheduler-policy.";
    }
    choice filter-params {
      description
        "Choice of filter parameters.";
      case filter-match-all {
        uses diffserv:filter-match-all;
        description
          "A filter that matches all packets.";
      }
    }
    description
      "Augments Queue Policy Classifier to add filter parameters.";
  }

  augment "/traffic-policy:policies/traffic-policy:policy/" +
          "traffic-policy:classifier/traffic-policy:action" {
    when "derived-from-or-self(../../traffic-policy:type, " +
         "'qos-types:scheduler-policy-type')" {
      description
        "These actions apply only when policy type is
         scheduler-policy.";
    }

    choice action-params {
      description
        "Choice of action parameters that can be taken.";

      case scheduler {
        uses qos-action:scheduler;
      }

      case queue-policy-name {
        container queue-policy-name {
          leaf queue-policy {
            type leafref  {
              path "/traffic-policy:policies/" +
                   "traffic-policy:policy/traffic-policy:name";
            }
            must "derived-from-or-self(/traffic-policy:policies" +
                 "/traffic-policy:policy/traffic-policy:type," +
                 "'qos-types:queue-policy-type')";
            mandatory true;
            description
              "This leafref refers to Queue Policy name.";
          }
          description
            "Container for Queue Policy name.";
        }
      }
    }
    description
      "Augments Queue Policy Classifier to add in Action parameters
       for Scheduler policy.";
  }
}
	  
	  ]]>
        

      


      
	Queue Policy module augments the Traffic Policy module. It
	augments to allow queues to be referred to in a policy. The
	match is based on Traffic group and action parameters which
	are defined in QoS Action module.

	
	  ietf-queue-policy abridged tree diagram
          
	

        
	  ietf-queue-policy module
          file "ietf-queue-policy@2023-07-20.yang"
module ietf-queue-policy {
  yang-version 1.1;
  namespace "urn:ietf:params:xml:ns:yang:ietf-queue-policy";
  prefix queue-policy;

  import ietf-traffic-policy {
    prefix traffic-policy;
  }
  import ietf-qos-action {
    prefix qos-action;
  }
  import ietf-diffserv {
    prefix diffserv;
  }
  import iana-qos-types {
    prefix qos-types;
    reference
      "RFC XXXX: YANG Models for Quality of Service (QoS).";
  }

  organization
    "IETF Routing Area Working Group.";

  contact
    "WG Web:   
     WG List:  

     Editor:   Aseem Choudhary
               
     Editor:   Mahesh Jethanandani
               ";

  description
    "This module contains a collection of YANG definitions for
     QoS Queue policies.

     Copyright (c) 2023 IETF Trust and the persons identified as
     authors of the code.  All rights reserved.

     Redistribution and use in source and binary forms, with or
     without modification, is permitted pursuant to, and subject
     to the license terms contained in, the Revised BSD License
     set forth in Section 4.c of the IETF Trust's Legal Provisions
     Relating to IETF Documents
     (http://trustee.ietf.org/license-info).

     This version of this YANG module is part of RFC XXXX; see
     the RFC itself for full legal notices.";

  revision 2023-07-20 {
    description
      "Initial version.";
    reference
      "RFC XXXX: YANG Models for Quality of Service (QoS).";
  }

  augment "/traffic-policy:policies/traffic-policy:policy" +
          "/traffic-policy:classifier/traffic-policy:inline" +
          "/traffic-policy:filter" {
    when "derived-from-or-self(../../../traffic-policy:type, " +
         "'qos-types:queue-policy-type')" {
      description
        "If policy type is Queue Policy, this filter can be used.";
    }

    choice filter-params {
      description
        "Choice of Action types.";
      case traffic-group {
        uses diffserv:traffic-group;
        description
          "Traffic group name.";
      }
      case filter-match-all {
        uses diffserv:filter-match-all;
        description
          "When the filter type is set to match all packets.";
      }
    }
    description
      "Augments Queue Policy to add filter types.";
  }

  augment "/traffic-policy:policies/traffic-policy:policy" +
          "/traffic-policy:classifier/traffic-policy:action" {
    when "derived-from-or-self(../../traffic-policy:type,"  +
         "'qos-types:queue-policy-type')" {
      description
        "Queue Policy actions.";
    }

    choice action-params {
      description
        "Choice of different action parameters that can be taken.";

      case queue-template-name {
        uses qos-action:queue-reference;
      }

      case queue-inline {
        uses qos-action:queue;
      }
    }
    description
      "Augments Queue Policy action to add Queue template reference
       or Queue inline.";
  }
}
	  
	  ]]>
        

      


      
	The QoS Types module contains all the type definitions used
	by the other QoS modules.

	
	  iana-qos-types module
          file "iana-qos-types@2023-07-20.yang"
module iana-qos-types {
  yang-version 1.1;
  namespace "urn:ietf:params:xml:ns:yang:iana-qos-types";
  prefix qos-types;

  organization
    "IETF Routing Area Working Group";

  contact
    "WG Web:   
     WG List:  

     Editor:   Aseem Choudhary
               
     Editor:   Mahesh Jethanandani
               ";

  description
    "This module contains type definitions for all QoS types.

     Copyright (c) 2022 IETF Trust and the persons identified as
     authors of the code.  All rights reserved.

     Redistribution and use in source and binary forms, with or
     without modification, is permitted pursuant to, and subject
     to the license terms contained in, the Simplified BSD License
     set forth in Section 4.c of the IETF Trust's Legal Provisions
     Relating to IETF Documents
     (http://trustee.ietf.org/license-info).

     This version of this YANG module is part of RFC XXXX; see
     the RFC itself for full legal notices.";

  revision 2023-07-20 {
    description
      "Initial version";
    reference
      "RFC XXXX: YANG Models for Quality of Service (QoS).";
  }

  /*
   * Features.
   */
  feature child-policy {
    description
      " This feature allows configuration of hierarchical policy.";
  }
  feature count {
    description
      "This feature allows action configuration to enable
       counter in a classifier";
  }
  feature named-counter {
    description
      "This feature allows action configuration to enable
       named counter in a classifier";
  }

  /*
   * Identities.
   */
  identity policy-type {
    description
      "Base identity for policy type.";
  }
  identity diffserv-policy-type {
    base policy-type;
    description
      "Policy type defined as DiffServ.";
  }
  identity ipv4-diffserv-policy-type {
    base policy-type;
    description
      "Policy type defined as a DiffServ IPv4 policy type.";
  }
  identity ipv6-diffserv-policy-type {
    base policy-type;
    description
      "Policy type defined as a DiffServ IPv6 policy type.";
  }
  identity queue-policy-type {
    base policy-type;
    description
      "Policy type defined as a queue policy type.";
  }
  identity scheduler-policy-type {
    base policy-type;
    description
      "Policy type defined as a scheduler policy type.";
  }

  identity action-type {
    description
      "Base identity for the action type.";
  }
  identity dscp-marking {
    base action-type;
    description
      "Action type defined as DSCP marking.";
  }
  identity meter-inline {
    base action-type;
    description
      "Action type defined as meter inline.";
  }
  identity meter-reference {
    base action-type;
    description
      "Action type defined as meter reference.";
  }
  identity queue {
    base action-type;
    description
      "Action type defined as queue.";
  }
  identity scheduler {
    base action-type;
    description
      "Action type defined as scheduler.";
  }
  identity discard {
    base action-type;
    description
      "Action type defined as discard.";
  }
  identity child-policy {
    if-feature child-policy;
    base action-type;
    description
      "Action type defined as child policy.";
  }
  identity count {
    if-feature count;
    base action-type;
    description
      "Action type defined as count.";
  }
  identity named-counter {
    if-feature named-counter;
    base action-type;
    description
      "Action type specified as a named counter.";
  }
  identity queue-policy-name {
    base action-type;
    description
      "Action type specified as a queue policy name.";
  }
  
  identity meter-type {
    description
      "Base identity for types of meter.";
  }
  identity one-rate-two-color {
    base meter-type;
    description
      "Meter type specified as one rate two color meter.";
  }
  identity one-rate-tri-color {
    base meter-type;
    description
      "Meter type specified as one rate three color meter.";
  }
  identity two-rate-tri-color {
    base meter-type;
    description
      "Meter type specified as two rate three color meter.";
  }

  identity drop-type {
    description
      "Base identity for drop algorithm.";
  }
  identity tail-drop {
    base drop-type;
    description
      "Drop algorithm specified as tail drop.";
  }
  identity red {
    base drop-type;
    description
      "Drop algorithm specified as RED.";
  }
  identity wred {
    base drop-type;
    description
      "Drop algorithm specified as WRED.";
  }

  identity rate-unit-type {
    description
      "Base definition for the type of rate unit.";
  }
  identity bits-per-second {
    base rate-unit-type;
    description
      "Rate specified in bits per second.";
  }
  identity percent {
    base rate-unit-type;
    description
      "Rate specified as a percentage of queue depth.";
  }

  identity burst-unit-type {
    description
      "Base definition for burst specification.";
  }
  identity bytes {
    base burst-unit-type;
    description
      "Burst specified in bytes.";
  }
  identity microsecond {
    base burst-unit-type;
    description
      "Burst specified in microseconds.";
  }

  identity red-threshold-unit {
    description
      "Base definition for RED threshold specification.";
  }
  identity red-threshold-bytes {
    base red-threshold-unit;
    description
      "RED threshold specified in bytes.";
  }
  identity red-threshold-us {
    base red-threshold-unit;
    description
      "RED threshold specified in microseconds.";
  }
  identity red-threshold-pc {
    base red-threshold-unit;
    description
      "RED threshold specified as a percentage.";
  }
  identity red-theshold-pt {
    base red-threshold-unit;
    description
      "RED threshold specified per-thousand.";
  }

  identity wred-color-type {
    description
      "Base identity for WRED color type.";
  }
  identity wred-color-dscp {
    base wred-color-type;
    description
      "WRED color specified by DSCP.";
  }

  identity probability-unit {
    description
      "Base definition for probability unit.";
  }
  identity probability-pc {
    base probability-unit;
    description
      "Probability specified in percentage.";
  }
  identity probability-pt {
    base probability-unit;
    description
      "Probability specified in unit of per thousand.";
  }
  identity probability-denominator {
    base probability-unit;
    description
      "Probability value specified as a denominator value
       while numerator is always 1.";
  }

  identity filter-type {
    description
      "Base identity for filter type.";
  }

  identity dscp {
    base filter-type;
    description
      "Filter type specified as DSCP.";
  }
  identity source-ipv4-prefix {
    base filter-type;
    description
      "Filter type specified as source IPv4 prefix.";
  }
  identity destination-ipv4-prefix {
    base filter-type;
    description
      "Filter type specified as destination IPv4 prefix.";
  }
  identity source-ipv6-prefix {
    base filter-type;
    description
      "Filter type specified as source IPv6 prefix.";
  }
  identity destination-ipv6-prefix {
    base filter-type;
    description
      "Filter type specified as destination IPv6 prefix.";
  }
  identity source-port {
    base filter-type;
    description
      "Filter type specified as source port.";
  }
  identity destination-port {
    base filter-type;
    description
      "Filter type specified as destination port.";
  }
  identity protocol {
    base filter-type;
    description
      "Filter type specified as protocol.";
  }
  identity traffic-group-name {
    base filter-type;
    description
      "Filter type specified as traffic group name.";
  }
  identity filter-match-all {
    base filter-type;
    description
      "Filter type specified as match all.";
  }

  typedef match-operation-type {
    type enumeration {
      enum match-all {
        description
          "Classifier entry filters logical AND operation";
      }
      enum match-any {
        description
          "Classifier entry filters logical OR operation";
      }
    }
    default "match-all";
    description
      "Filter match logical operation type";
  }

  identity direction {
    description
      "Base identity for traffic direction";
  }
  identity ingress {
    base direction;
    description
      "Direction of traffic coming into the network entry";
  }
  identity egress {
    base direction;
    description
      "Direction of traffic going out of the network entry";
  }

  identity meter-action-type {
    description
      "Base identify for actions related to metering";
  }
  identity action-drop {
    base meter-action-type;
      description
        "Drop packets that conform/exceed/violate to the set value.";
  }
  identity action-transmit {
    base meter-action-type;
      description
        "Transmit packets that conform/exceed/violate to the set
         value.";
  }
  identity action-mark {
    base meter-action-type;
      description
        "Mark packets that conform/exceed/violate to the set value.";
  }

  identity clear-counters-type {
    description
      "Base identify for clear interface counters related options";
  }
  identity all-counters {
    base clear-counters-type;
      description
        "Clear all counters in both directions.";
  }
  identity inbound-counters {
    base clear-counters-type;
      description
        "Clear counters in inbound direction.";
  }
  identity outbound-counters {
    base clear-counters-type;
      description
        "Clear counters in outbound direction.";
  }
}
	  
	  ]]>



    
      This document registers seven URIs and seven YANG
      modules.

      
        Following the format in the IETF XML
        registry, the following registration is requested to
        be made:
	
          
        
	

        Registrant Contact: The IESG. XML: N/A, the requested URI
        is an XML namespace.
      

      
        This document registers seven YANG modules in the YANG
        Module Names registry YANG.

        
            
          
	
      
    

    
      The YANG module specified in this document defines a schema
      for data that is designed to be accessed via network management
      protocols such as NETCONF or RESTCONF. The lowest NETCONF layer is
      the secure transport layer, and the mandatory-to-implement
      secure transport is Secure Shell
      (SSH). The lowest RESTCONF layer is HTTPS, and the
      mandatory-to-implement secure transport is TLS. The NETCONF
      Access Control Model (NACM)  provides the means to
      restrict access for particular NETCONF or RESTCONF users to a
      preconfigured subset of all available NETCONF or RESTCONF
      protocol operations and content.

      There are a number of data nodes defined in this YANG module
      that are writable/creatable/deletable (i.e., config true, which
      is the default).  These data nodes may be considered sensitive
      or vulnerable in some network environments. Write operations
      (e.g., edit-config) to these data nodes without proper
      protection can have a negative effect on network
      operations. Some of the subtrees and data nodes and their
      sensitivity/vulnerability are described here.

      - 'filter-operation' and 'filter'. 'filter-operation'
      includes the ability to 'match all', which is a logical AND
      operation or 'match any', which is a logical OR operation. Both
      the operations have an impact on the traffic that is being
      classified. Similarly, the 'filter' list decides what parts of
      the packet will examined, which will also impact the traffic
      that is being classified.

      - 'action'. The 'action' decides what action will be taken on
      the packet. That includes whether the packet will be marked,
      queued, or just discarded.

      Some of the readable data nodes in this YANG module may be
      considered sensitive or vulnerable in some network
      environments. It is thus important to control read access (e.g.,
      via get, get-config, or notification) to these data nodes. Some
      of the subtrees and data nodes and their
      sensitivity/vulnerability are:

      - 'conform-pkts', 'conform-bytes', 'exceed-pkts',
      'exceed-bytes', 'voilate-pkts' or 'voilate-bytes'. All these
      statistics combined with their 'meter-id' are an indication of
      what is happening in the network, and can allow for an intruder
      insight into how to disrupt the traffic.

      - 'tail-drop-pkts', 'red-drop-bytes', 'wred-stats' are
      examples of statistics that indicate the kind of traffic that is
      being profiled for drop or marked for Explicit Congestion
      Notification (ECN), and can give an insight into the operation
      of a network.

      Some of the RPC operations in this YANG module may be
      considered sensitive or vulnerable in some network
      environments. It is thus important to control access to these
      operations. These are the operations and their
      sensitivity/vulnerability:

      - The model allows for statistics to be cleared by the
      'clear' RPC operation, causing all the individual statistics to
      be cleared.
    

    
     The authors wish to thank Ruediger Geib, Fred Baker, Greg
    Mirsky, Tom Petch, Acee Lindem, many others for their helpful
    comments. 
    

    
      The following people have substantially contributed to the editing of this document:




  

  
    

    

    
      

      &RFC2119;

      &RFC6020;

      &RFC6991;

      &RFC7950;

      &RFC8174;

      
      
    

    
      
      
      
      
      
      
      
      
      
      
      
    

    
      This section carries complete tree diagrams of each module
      defined in this draft. The tree diagrams use the notation
      defined in YANG Tree Diagrams.

      
        
	        Traffic Policy Tree Diagram
          
        
      
            
        
	        QoS Action Module Tree Diagram
          
        
      
      
        
	        DiffServ Module Tree Diagram
          
        
      
      
        
	        QoS Operational Module Tree Diagram
          
        
      
      
        
	        Scheduler Policy Module Tree Diagram
           /traffic-policy:policies/policy/name
	        ]]>
        
      
      
        
	        Queue Policy Module Tree Diagram
          
        
      
    

    
      Company A and Company B DiffServ modules augments all the filter types of the QoS
      Classifier module as well as the QoS Policy module that allow it to
      define marking, metering, min-rate, max-rate actions. Queueing and
      metering counters are realized by augmenting of the QoS Target
      module.

      
       The following Company A vendor example augments the QoS and DiffServ model,
demonstrating some of the following functionality:
      
        - use of template based classifier definitions 
        - use of single policy type modelling queue, scheduler
   policy, and a filter policy. All of these policies either augment
   the QoS policy or the DiffServ modules
        - use of inline actions in a policy
        - flexibility in marking dscp or metadata at ingress and/or egress. 
        
          ";
  description
    "This module contains a collection of YANG definitions of
     companyA diffserv specification extension.";
  revision 2023-07-20 {
    description
      "Initial revision for diffserv actions on network packets.";
    reference
      "RFC XXXX: A YANG Data Model for Quality of Service (QoS).";
  }

  identity default-policy-type {
    base qos-types:policy-type;
    description
      "This defines default policy-type.";
  }

  identity qos-group {
    base qos-types:filter-type;
    description
      "Filter-type to match on  packet metadata. This metadata
       can be used for packet marking, queuing for traffic in
       egress direction.";
  }

  grouping qos-group {
    list qos-group {
      key "min max";
      description
        "List of qos-groups to match on. A QoS group is a set of
         packets tagged as group.";
      leaf min {
        type uint8;
        description
          "Minimum value of qos-group range.";
      }
      leaf max {
        type uint8;
        must ". >= ../min" {
          error-message
          "The qos-group max must be 
           greater than or equal to qos-group min.";
        }
        description
          "Maximum value of qos-group range.";
      }
    }
    description
      "Filter containing list of qos-group ranges.";
  }
  grouping bw-remaining-percent {
    container bw-remaining-percent {
      leaf value {
        type uint8;
        units "percentage";
        description
          "Percentage of the remaining bandwidth present.";
      }
      description
        "Remaining bandwidth of the link in percent.";
    }
    description
      "Grouping for bandwidth remaining after
      reserved and priority bandwidth.";
  }
  grouping qos-group-marking {
    container qos-group {
      leaf qos-group {
        type uint8;
        description
          "Mark metadata information in the network packet";
      }
      description
        "Container for QoS-Group marking.";
    }
    description
      "Grouping for QoS-Group marking.";
  }

  augment "/traffic-policy:classifiers/" +
    "traffic-policy:classifier/" +
    "traffic-policy:filter/diffserv:filter-param" {
    case qos-group {
      uses qos-group;
      description
        "Filter containing list of qos-group ranges.
        QoS-group represent packet metadata information
        in a network packet.";
    }
    description
      "Augmentation of classifier filters.";
  }

  augment "/traffic-policy:policies/traffic-policy:policy/" +
    "traffic-policy:classifier/" +
    "traffic-policy:action" {
    choice action-params {
      case priority {
	uses qos-action:priority;
      }
      case min-rate {
	uses qos-action:min-rate;
      }
      case max-rate {
	uses qos-action:max-rate;
      }
      case bw-remaining {
	uses bw-remaining-percent;
      }
      case mark-qos-group {
	uses qos-group-marking;
      }
      description
	"Choice of action parameters.";
    }
    description
      "Augments policy entry to add action parameters.";
  }

  augment "/traffic-policy:policies" +
    "/traffic-policy:policy" +
    "/traffic-policy:classifier" +
    "/traffic-policy:action" +
    "/diffserv:action-params" +
    "/diffserv:meter-inline" +
    "/diffserv:meter-types" +
    "/diffserv:single-rate-two-color-meter-type" +
    "/diffserv:single-rate-two-color-meter" {
    description
      "Augment the single-rate-two-color meter to add" +
      "color classifiers.";
    container conform-color {
      uses traffic-policy:generic-classifier-attr;
      description
        "Conform color classifier container.";
    }
    container exceed-color {
      uses traffic-policy:generic-classifier-attr;
      description
        "Exceed color classifier container.";
    }
  }

  augment "/traffic-policy:policies" +
    "/traffic-policy:policy" +
    "/traffic-policy:classifier" +
    "/traffic-policy:action" +
    "/diffserv:action-params" +
    "/diffserv:meter-inline" +
    "/diffserv:meter-types" +
    "/diffserv:single-rate-three-color-meter-type" +
    "/diffserv:single-rate-three-color-meter" {
    description
      "Augment the one-rate-tri-color meter to add" +
      "color classifiers.";
    container conform-color {
      uses traffic-policy:generic-classifier-attr;
      description
        "Conform color classifier container.";
    }
    container exceed-color {
      uses traffic-policy:generic-classifier-attr;
      description
        "Exceed color classifier container.";
    }
    container violate-color {
      uses traffic-policy:generic-classifier-attr;
      description
        "Violate color classifier container.";
    }
  }

  augment "/traffic-policy:policies" +
    "/traffic-policy:policy" +
    "/traffic-policy:classifier" +
    "/traffic-policy:action" +
    "/diffserv:action-params" +
    "/diffserv:meter-inline" +
    "/diffserv:meter-types" +
    "/diffserv:two-rate-three-color-meter-type" +
    "/diffserv:two-rate-three-color-meter" {
    description
      "Augment the two-rate-tri-color meter to add" +
      "color classifiers.";
    container conform-color {
      uses traffic-policy:generic-classifier-attr;
      description
        "Conform color classifier container.";
    }
    container exceed-color {
      uses traffic-policy:generic-classifier-attr;
      description
        "Exceed color classifier container.";
    }
    container violate-color {
      uses traffic-policy:generic-classifier-attr;
      description
        "Violate color classifier container.";
    }
  }
}
    ]]>
        
      
      
       The following vendor example augments the QoS and DiffServ model,
demonstrating some of the following functionality:
      
 
        - use of inline classifier definitions (defined inline in the policy
   vs referencing an externally defined classifier)
        - use of mulitple policy types, e.g. a queue policy, a scheduler
   policy, and a filter policy. All of these policies either augment
   the QoS policy or the DiffServ modules
        - use of a queue module, which uses and extends the queue grouping
   from the QoS Action module
        - use of meter templates (v.s. meter inline)
        - use of internal meta data for classification and marking
        
          ";

  description
    "This module contains a collection of YANG definitions for
     configuring diffserv specification implementations.

     Copyright (c) 2022 IETF Trust and the persons identified as
     authors of the code.  All rights reserved.

     Redistribution and use in source and binary forms, with or
     without modification, is permitted pursuant to, and subject
     to the license terms contained in, the Revised BSD License
     set forth in Section 4.c of the IETF Trust's Legal Provisions
     Relating to IETF Documents
     (http://trustee.ietf.org/license-info).

     This version of this YANG module is part of RFC XXXX; see
     the RFC itself for full legal notices.";

  revision 2023-07-20 {
    description
      "Initial revision of diffserv policy for Company B.";
    reference
      "RFC XXXX: YANG Data Model for QoS.";
  }


  /*************************************************
   * Classification types
   *************************************************/

  identity internal-loss-priority  {
     base qos-types:filter-type;
     description
        "Internal loss priority filter type.";
  }

  grouping loss-priority {
    list loss-priority {
      key "loss-priority";
      description
        "list of loss-priorities";
      leaf loss-priority {
        type enumeration {
          enum high {
           description "High loss Priority.";
          }
          enum medium-high {
           description "Medium to high loss priority.";
          }
          enum medium-low {
           description "Medium to low loss priority.";
          }
          enum low {
           description "Low loss priority.";
          }
        }
        description
          "Loss priority.";
      }
    }
    description
      "Filter containing list of loss priorities";
  }

  augment "/traffic-policy:policies" +
          "/traffic-policy:policy" +
          "/traffic-policy:classifier" +
          "/traffic-policy:inline/traffic-policy:filter" +
          "/diffserv:filter-params" {
    case internal-loss-priority {
        uses loss-priority;
      description
        "Filter Type Internal-loss-priority";
    }
    description 
      "Augments Diffserv Classifier with vendor " +
      "specific types.";
  }

  /*************************************************
   * Actions 
   *************************************************/

  identity mark-loss-priority {
    base qos-types:action-type;
    description
      "Mark loss-priority action type.";
  }

  grouping mark-loss-priority {
    container mark-loss-priority {
      leaf loss-priority {
        type enumeration {
          enum high {
           description "High loss Priority.";
          }
          enum medium-high {
           description "Medium to high loss priority.";
          }
          enum medium-low {
           description "Medium to low loss priority.";
          }
          enum low {
           description "Low loss priority.";
          }
        }
        description
          "Loss priority.";
      }
      description
        "Mark loss priority container.";
    }
    description
      "Mark loss priority grouping.";
  }

  augment "/traffic-policy:policies" +
          "/traffic-policy:policy" +
          "/traffic-policy:classifier" +
          "/traffic-policy:action" +
          "/diffserv:action-params" {
    case traffic-group-marking {
      uses qos-action:traffic-group-marking;
      description
        "Mark traffic group in the packet.";
    }
    case mark-loss-priority {
        uses mark-loss-priority;
      description
        "Mark loss priority in the packet.";
    }
    case meter-reference {
        uses qos-action:meter-reference;
      description
        "Assign a meter as an action.";
    }
    case discard {
        uses qos-action:discard;
      description
        "Discard action.";
    }
    case count {
        uses qos-action:count;
      description
        "Count action - explicit count configuration.";
    }

    description 
      "Augments common diffserv policy actions";
  }
  
  augment "/qos-action:meters" +
          "/qos-action:meter" +
          "/qos-action:meter-types" +
          "/qos-action:single-rate-three-color-meter-type" +
          "/qos-action:single-rate-three-color-meter" {
     leaf one-rate-color-aware {
      type boolean;
      description
        "This defines if the meter is color-aware.";
    }
    description
      "Augmentation of color-aware flag.";
  }
  augment "/qos-action:meters" +
          "/qos-action:meter" +
          "/qos-action:meter-types" +
          "/qos-action:two-rate-three-color-meter-type" +
          "/qos-action:two-rate-three-color-meter" {
     leaf two-rate-color-aware {
      type boolean;
      description
        "This defines if the meter is color-aware.";
    }
    description
      "Augmentation of color-aware flag.";
  }
  
}

module example-compb-queue-policy {
  yang-version 1.1;
  namespace "urn:ietf:params:xml:ns:yang:example-compb-queue-policy";
  prefix queue-plcy;

  import iana-qos-types {
    prefix qos-types;
    reference
      "RFC XXXX: YANG Models for Quality of Service (QoS).";
  }
  import ietf-traffic-policy {
    prefix traffic-policy;
  }

  organization "Company B";
  contact
    "Editor:   XYZ
              ";

  description
    "This module defines a queue policy. The classification
     is based on aforwarding class, and the actions are queues.

     Copyright (c) 2014 IETF Trust and the persons identified as
     authors of the code.  All rights reserved.

     Redistribution and use in source and binary forms, with or
     without modification, is permitted pursuant to, and subject
     to the license terms contained in, the Simplified BSD License
     set forth in Section 4.c of the IETF Trust's Legal Provisions
     Relating to IETF Documents
     (http://trustee.ietf.org/license-info).

     This version of this YANG module is part of RFC XXXX; see
     the RFC itself for full legal notices.";

  revision 2023-07-20 {
    description
      "Initial revision of diffserv policy";
    reference
      "RFC XXXX: A YANG Data Model for Quality of Service (QoS).";
  }

  identity compb-queue {
    base qos-types:action-type;
    description
      "compb-queue action type";
  }

  grouping compb-queue-name {
    container queue-name {
      leaf name {
        type string;
        description
          "Queue class name";
      }
      description
        "compb queue container";
    }
    description
      "compb-queue grouping";
  }
  
  augment "/traffic-policy:policies" +
          "/traffic-policy:policy" +
          "/traffic-policy:classifier" +
          "/traffic-policy:action" {
    choice action-params {
      description
        "Choice of action types";
      case compb-queue {
        uses compb-queue-name;
      }
    }
    description
      "Augment the queue actions to queue policy entry";
  }
}

module example-compb-queue {
  yang-version 1.1;
  namespace "urn:ietf:params:xml:ns:yang:ietf-compb-queue";
  prefix compb-queue;

  import ietf-qos-action {
    prefix qos-action;
    reference "RFC XXXX: YANG Model for QoS";
  }

  organization "Company B";
  contact
    "Editor:   XYZ
               ";

  description
    "This module describes a compb queue module. This is a
     template for a queue within a queue policy, referenced
     by name.

     This version of this YANG module is part of RFC XXXX; see
     the RFC itself for full legal notices.";

  revision 2023-07-20 {
    description
      "Initial revision of diffserv based classifier";
    reference
      "RFC XXXX: YANG Data Model for Quality of Service (QoS).";
  }

  container compb-queue {
    description
      "Queue used in compb architecture";
    leaf name {
      type string;
      description
        "A unique name identifying this queue";
    }
    uses qos-action:queue;
    container excess-rate {
      choice excess-rate-type {
        case percent {
          leaf excess-rate-percent {
            type uint32 {
              range "1..100";
            }
            description
              "excess-rate-percent";
          }
        }
        case proportion {
          leaf excess-rate-poroportion {
            type uint32 {
              range "1..1000";
            }
            description
              "excess-rate-poroportion";
          }
        }
        description
          "Choice of excess-rate type";
      }
      description
        "Excess rate value";
    }
    leaf excess-priority {
      type enumeration {
        enum high {
          description "High Loss Priority";
        }
        enum medium-high {
          description "Medium-high Loss Priority";
        }
        enum medium-low {
          description "Medium-low Loss Priority";
        }
        enum low {
          description "Low Loss Priority";
        }
        enum none {
          description "No excess priority";
        }
      }
      description
        "Priority of excess (above guaranted rate) traffic";
    }
    container buffer-size {
      choice buffer-size-type {
        case percent {
          leaf buffer-size-percent {
            type uint32 {
              range "1..100";
            }
            description
              "buffer-size-percent";
          }
        }
        case temporal {
          leaf buffer-size-temporal {
            type uint64;
            units "microsecond";
            description
              "buffer-size-temporal";
          }
        }
        case remainder {
          leaf buffer-size-remainder {
            type empty;
            description
              "use remaining of buffer";
          }
        }
        description
          "Choice of buffer size type";
      }
      description
        "Buffer size value";
    }
  }

  augment
    "/compb-queue/queue/algorithmic-drop" +
    "/drop-algorithm" {
    case random-detect {
      list drop-profile-list {
        key "priority";
        description
          "map of priorities to drop-algorithms";
        leaf priority {
          type enumeration {
            enum any {
              description "Any priority mapped here";
            }
            enum high {
              description "High Priority Packet";
            }
            enum medium-high {
              description "Medium-high Priority Packet";
            }
            enum medium-low {
              description "Medium-low Priority Packet";
            }
            enum low {
              description "Low Priority Packet";
            }
          }
          description
            "Priority of guaranteed traffic";
        }
        leaf drop-profile {
          type string;
          description
            "drop profile to use for this priority";
        }
      }
    }
    description
      "compb random detect drop algorithm config";
  }
}

module example-compb-scheduler-policy {
  yang-version 1.1;
  namespace "urn:ietf:params:xml:ns:yang:" +
            "example-compb-scheduler-policy";
  prefix scheduler-plcy;

  import ietf-qos-action {
    prefix qos-action;
    reference
      "RFC XXXX: A YANG Data Model for Quality of Service (QoS).";
  }
  import ietf-traffic-policy {
    prefix traffic-policy;
    reference
      "RFC XXXX: A YANG Data Model for Quality of Service (QoS).";
  }

  organization
    "Company B";

  contact
    "Editor:   XYZ
               ";

  description
    "This module defines a scheduler policy. The classification
     is based on classifier-any, and the action is a scheduler.";

  revision 2023-07-20 {
    description
      "Initial revision of diffserv policy";
    reference
      "RFC XXXX: A YANG Data Model for Quality of Service (QoS).";
  }

  grouping queue-policy-name {
    container compb-queue-policy-name {
      leaf name {
        type string;
        description
          "Queue policy name";
      }
      description
        "compb-queue-policy container";
    }
    description
      "compb-queue policy grouping";
  }

  augment "/traffic-policy:policies" +
    "/traffic-policy:policy" +
    "/traffic-policy:classifier" +
    "/traffic-policy:action" {
    choice action-params {
      case scheduler {
        uses qos-action:scheduler;
      }
      case queue-policy {
        uses queue-policy-name;
      }
      description
        "Augment the scheduler policy with a queue policy";
    }
    description
      "Augmentation of the scheduler policy with a queue policy";
  }
}
    ]]>
        
      
    
    
      This section describes several examples of how the models defined in this draft can be used for configuration.
      
        
	  Configuration example for QoS Classifier
          


  
    my-classifier
    match-all
    
      qt:dscp
      true
      
        11
        13
      
    
    
      qt:source-port
      false
        
          10000
          10300
        
        
          17540
          19800
        
    
  

    ]]>
        
      
      
        
	  Configuration example for QoS Policy
          



  
    my-policy
    qt:diffserv-policy-type
    
      my-classifier
      
        
	      qt:dscp
	      false
            
              21
              22
            
        
      
      
        qt:dscp-marking
        
          23
        
      
    
  

    ]]>
        
      
      
        
	  Configuration example for QoS Policing
          



  
    ICMP
    class-map definition for ICMP
    
      qt:protocol
      false
      
        4
        4
      
    
  



  
    SINGLE-RATE-TWO-COLOR
    qt:diffserv-policy-type
    
      ICMP
      
	qt:meter-inline
	
	  128000
	  
	    qt:action-transmit
	  
	  
	    qt:action-drop
	  
	
      
    
  



  
    FastEthernet 0/0
    ianaift:ethernetCsmacd
    
      qt:ingress
      qt:diffserv-policy-type
      SINGLE-RATE-TWO-COLOR
    
  

    ]]>
        
      
      
        
	  Configuration example for QoS Queueing
          



  
    VOICE
    class-map definition for VOICE
    
      qt:protocol
      false
      
        46
        46
      
    
  
  
    VIDEO
    class-map definition for VIDEO
    
      qt:protocol
      false
      
        34
        34
      
    
  
  
    DATA
    class-map definition for DATA
    
      qt:protocol
      false
      
        10
        10
      
    
  



  
    QUEUEING-POLICY
    qt:diffserv-policy-type
    
      VOICE
      
	qt:queue
	
	  
	    1
	  
	  
	    2000000
	    qt:bits-per-second
	  
	  
	    4000000
	    qt:bits-per-second
	  
	
      
    
    
      VIDEO
      
	qt:queue
	
	  
	    2
	  
	  
	    10000000
	    qt:bits-per-second
	  
	  
	    30000000
	    qt:bits-per-second
	  
	
      
    
    
      DATA
      
	qt:queue
	
	  
	    2
	  
	  
	    8000000
	    qt:bits-per-second
	  
	  
	    18000000
	    qt:bits-per-second
	  
	
      
    
  



  
    FastEthernet 0/0
    ianaift:ethernetCsmacd
    
      qt:egress
      qt:diffserv-policy-type
      QUEUEING-POLICY
    
  

    ]]>
        
      
      
        
	  Configuration example for QoS Scheduling
          




  
    QUEUEING-POLICY
    qt:queue-policy-type
    
      VOICE
       
        
          qt:traffic-group-name
          false
          
            voice
          
        
       
      
	qt:queue
	
	  
	    1
	  
	  
	    2000000
	    qt:bits-per-second
	  
	  
	    4000000
	    qt:bits-per-second
	  
  	
      
    
    
      VIDEO
       
        
          qt:traffic-group-name
          false
          
            video
          
        
       
      
	qt:queue
	
	  
	    2
	  
	  
	    10000000
	    qt:bits-per-second
	  
	  
	    30000000
	    qt:bits-per-second
	  
	
      
    
    
      DATA
       
        
          qt:traffic-group-name
          false
          
            data
          
        
       
      
	qt:queue
	
	  
	    2
	  
	  
	    8000000
	    qt:bits-per-second
	  
	  
	    18000000
	    qt:bits-per-second
	  
	
      
    
  
  
    SCHEDULING-POLICY
    qt:scheduler-policy-type
    
      ALL
       
        
          qt:filter-match-all
          false
          
            
          
        
       
      
	qt:scheduler
	
	  
	    20000000
	    qt:bits-per-second
	  
	  
	    50000000
	    qt:bits-per-second
	  
	
      
      
	qt:queue-policy-name
	
          QUEUEING-POLICY
	
      
    
  



  
    FastEthernet 0/0
    ianaift:ethernetCsmacd
    
      qt:egress
      qt:scheduler-policy-type
      SCHEDULING-POLICY
    
  

    ]]>