YANG Model for QoS
draft-asechoud-netmod-qos-model-00

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Network Working Group                                       A. Choudhary
Internet-Draft                                           M. Jethanandani
Intended status: Standards Track                           Cisco Systems
Expires: October 6, 2016                                   April 4, 2016

                           YANG Model for QoS
                   draft-asechoud-netmod-qos-model-00

Abstract

   This document describes a YANG model for Quality of Service (QoS)
   configuration and operational parameters.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on October 6, 2016.

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   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   described in the Simplified BSD License.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  QoS Model Design  . . . . . . . . . . . . . . . . . . . . . .   3
   4.  DiffServ Model Design . . . . . . . . . . . . . . . . . . . .   3
   5.  Modules Tree Structure  . . . . . . . . . . . . . . . . . . .   4
   6.  Modules . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
     6.1.  IETF-QOS-CLASSIFIER . . . . . . . . . . . . . . . . . . .  13
     6.2.  IETF-QOS-POLICY . . . . . . . . . . . . . . . . . . . . .  20
     6.3.  IETF-QOS-ACTION . . . . . . . . . . . . . . . . . . . . .  22
     6.4.  IETF-QOS-TARGET . . . . . . . . . . . . . . . . . . . . .  35
     6.5.  IETF-DIFFSERV . . . . . . . . . . . . . . . . . . . . . .  42
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  44
   8.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .  45
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  45
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  45
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  45
   Appendix A.  Open Items . . . . . . . . . . . . . . . . . . . . .  46
   Appendix B.  Company A example  . . . . . . . . . . . . . . . . .  46
     B.1.  EXAMPLE-COMPA-DIFFSERV  . . . . . . . . . . . . . . . . .  46
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  50

1.  Introduction

   This document defines a base YANG [RFC6020] data module for Quality
   of Service (QoS) configuration and operational parameters.
   Differentiated Services (DiffServ) module is an augmentation of the
   base QoS model.  Remote Procedure Calls (RPC) or notification
   definition is currently not part of this document and will be added
   later if necessary.  QoS base module defines a basic building blocks
   to define a classifier, policy, action and target.  The base module
   has been augmented to include packet match fields, action parameters,
   and statistics data to define the DiffServ module.  It is left up to
   individual vendors to stitch actions like queues, random-detect (RED)
   and vendor specific parameters of the DiffServ policy definitions.
   Designing the module in this manner allows for a very flexible and
   extensible module that should fit in with most of the vendor
   requirements.  The DiffServ model is based on DiffServ architecture,
   and various references have been made to available standard
   architecture documents.

   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.

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2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

3.  QoS Model Design

   A classifier consists of packets which may be grouped when a logical
   set of rules are applied on different packet header fields.  The
   grouping may be based on different values or range of values of same
   packet header field, presence or absence of some values or range of
   values of a packet field or a combination thereof.  The QoS
   classifier is defined in the ietf-qos-classifier module.

   A classifier entry contains one or more packet conditioning
   functions.  A packet conditioning function is typically based on
   direction of traffic and may drop, mark or delay network packets.  A
   set of classifier entries with corresponding conditioning functions
   when arranged in order of priority represents a QoS policy.  A QoS
   policy may contain one or more classifier entries.  These are defined
   in ietf-qos-policy module.

   Actions are configured in line with respect to the policy module.
   These include marking, dropping or shaping.  Actions are defined in
   the ietf-qos-action module.

   A meter qualifies if the traffic arrival rate is based on agreed upon
   rate and variability.  A meter is generally modeled with qualifying
   rate and variability defined as a token bucket.  Different vendors
   can extend it to have other types of generic meters as well.  Single
   Rate Tri Color Marking (srTCM) [RFC2697] meter and Two Rate Tri Color
   Marking (trTCM) [RFC2698] meter are defined separately in the ietf-
   qos-action module, along with generic-meter.

4.  DiffServ Model Design

   DiffServ architecture [RFC3289] and [RFC2475] describe 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

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   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 ietf-diffserv module, this is realized by
   augmenting the QoS classification module.

   Traffic conditioning includes metering, shaping, policing 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 ietf-diffserv module by
   augmenting the QoS policy module, which includes the QoS action
   module.

   Finally, statistics are realized in the ietf-diffserv module by
   augmenting the QoS target module.

5.  Modules Tree Structure

   This document defines five YANG modules - four QoS base modules and
   one DiffServ module.

   ietf-qos-classifier consists of classifier entries identified by a
   classifier entry name.  Each entry MAY contain a list of filter
   entries.  When no filter entry is present in a classifier entry, it
   matches all traffic.

   module: ietf-qos-classifier
      +--rw classifiers
         +--rw classifier-entry* [classifier-entry-name]
            +--rw classifier-entry-name                string
            +--rw classifier-entry-descr?              string
            +--rw classifier-entry-filter-operation?   identityref
            +--rw filter-entry* [filter-type filter-logical-not]
               +--rw filter-type           identityref
               +--rw filter-logical-not    boolean

   An ietf-qos-policy module contains list of policy objects identified
   by a policy name and policy type which MUST be provided.  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.

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   module: ietf-qos-policy
      +--rw policies
         +--rw policy-entry* [policy-name policy-type]
            +--rw policy-name         string
            +--rw policy-type         identityref
            +--rw policy-descr?       string
            +--rw classifier-entry* [classifier-entry-name]
               +--rw classifier-entry-name           string
               +--rw classifier-entry-inline?        boolean
               +--rw classifier-entry-filter-oper?   identityref
               +--rw filter-entry* [filter-type filter-logical-not]
                                    {policy-inline-classifier-config}?
               |  +--rw filter-type           identityref
               |  +--rw filter-logical-not    boolean
               +--rw classifier-action-entry-cfg* [action-type]
                  +--rw action-type    identityref
                  +--rw (action-cfg-params)?

   ietf-qos-action module contains grouping of set of QoS actions.
   These include metering, marking, dropping and shaping.  Marking sets
   DiffServ codepoint value in the classified packet.  Color-aware and
   Color-blind meters can also be configured in the action module.

   module: ietf-qos-action
      +--rw meter-template {meter-template-support}?
         +--rw meter-entry* [meter-name]
            +--rw meter-name           string
            +--rw (meter-type)?
               +--:(srtcm)
               |  +--rw srtcm
               |     +--rw committed-rate?    uint64
               |     +--rw committed-burst?   uint64
               |     +--rw excess-burst?      uint64
               |     +--rw conform-action
               |     |  +--rw meter-action-type?   identityref
               |     |  +--rw (val)?
               |     |     +--:(meter-action-dscp-mark)
               |     |     |  +--rw dscp-cfg
               |     |     |     +--rw dscp?   inet:dscp
               |     |     +--:(meter-action-drop)
               |     |        +--rw drop-cfg
               |     |           +--rw drop-action?   empty
               |     +--rw conform-color
               |     |  +--rw classifier-entry-name?     string
               |     |  +--rw classifier-entry-descr?    string
               |     |  +--rw classifier-entry-filter-operation?
                                                      identityref

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               |     +--rw exceed-action
               |     |  +--rw meter-action-type?   identityref
               |     |  +--rw (val)?
               |     |     +--:(meter-action-dscp-mark)
               |     |     |  +--rw dscp-cfg
               |     |     |     +--rw dscp?   inet:dscp
               |     |     +--:(meter-action-drop)
               |     |        +--rw drop-cfg
               |     |           +--rw drop-action?   empty
               |     +--rw exceed-color
               |     |  +--rw classifier-entry-name?    string
               |     |  +--rw classifier-entry-descr?   string
               |     |  +--rw classifier-entry-filter-operation?
                                                     identityref
               |     +--rw violate-action
               |     |  +--rw meter-action-type?   identityref
               |     |  +--rw (val)?
               |     |     +--:(meter-action-dscp-mark)
               |     |     |  +--rw dscp-cfg
               |     |     |     +--rw dscp?   inet:dscp
               |     |     +--:(meter-action-drop)
               |     |        +--rw drop-cfg
               |     |           +--rw drop-action?   empty
               |     +--rw violate-color
               |        +--rw classifier-entry-name?    string
               |        +--rw classifier-entry-descr?   string
               |        +--rw classifier-entry-filter-operation?
                                                     identityref
               +--:(trtcm)
               |  +--rw trtcm
               |     +--rw committed-rate?    uint64
               |     +--rw committed-burst?   uint64
               |     +--rw peak-rate?         uint64
               |     +--rw peak-burst?        uint64
               |     +--rw conform-action
               |     |  +--rw meter-action-type?   identityref
               |     |  +--rw (val)?
               |     |     +--:(meter-action-dscp-mark)
               |     |     |  +--rw dscp-cfg
               |     |     |     +--rw dscp?   inet:dscp
               |     |     +--:(meter-action-drop)
               |     |        +--rw drop-cfg
               |     |           +--rw drop-action?   empty
               |     +--rw conform-color
               |     |  +--rw classifier-entry-name?    string
               |     |  +--rw classifier-entry-descr?   string
               |     |  +--rw classifier-entry-filter-operation?
                                                     identityref

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               |     +--rw exceed-action
               |     |  +--rw meter-action-type?   identityref
               |     |  +--rw (val)?
               |     |     +--:(meter-action-dscp-mark)
               |     |     |  +--rw dscp-cfg
               |     |     |     +--rw dscp?   inet:dscp
               |     |     +--:(meter-action-drop)
               |     |        +--rw drop-cfg
               |     |           +--rw drop-action?   empty
               |     +--rw exceed-color
               |     |  +--rw classifier-entry-name?    string
               |     |  +--rw classifier-entry-descr?   string
               |     |  +--rw classifier-entry-filter-operation?
                                                     identityref
               |     +--rw violate-action
               |     |  +--rw meter-action-type?   identityref
               |     |  +--rw (val)?
               |     |     +--:(meter-action-dscp-mark)
               |     |     |  +--rw dscp-cfg
               |     |     |     +--rw dscp?   inet:dscp
               |     |     +--:(meter-action-drop)
               |     |        +--rw drop-cfg
               |     |           +--rw drop-action?   empty
               |     +--rw violate-color
               |        +--rw classifier-entry-name?     string
               |        +--rw classifier-entry-descr?    string
               |        +--rw classifier-entry-filter-operation?
                                                     identityref
               +--:(generic-meter)
                  +--rw generic-meter-cfg
                     +--rw meter-list* [meter-id]
                        +--rw meter-id          uint16
                        +--rw rate-value?       uint64
                        +--rw rate-unit?        identityref
                        +--rw (burst-type)?
                        |  +--:(size)
                        |  |  +--rw burst-size?       uint64
                        |  +--:(interval)
                        |     +--rw burst-interval?   uint64
                        +--rw color
                        |  +--rw classifier-entry-name?      string
                        |  +--rw classifier-entry-descr?     string
                        |  +--rw classifier-entry-filter-operation?
                                                         identityref
                        +--rw succeed-action
                        |  +--rw meter-action-type?   identityref
                        |  +--rw (val)?
                        |  |  +--:(meter-action-dscp-mark)

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                        |  |  |  +--rw dscp-cfg
                        |  |  |     +--rw dscp?   inet:dscp
                        |  |  +--:(meter-action-drop)
                        |  |     +--rw drop-cfg
                        |  |        +--rw drop-action?   empty
                        |  +--rw next-meter-id?       uint16
                        +--rw fail-action
                           +--rw meter-action-type?   identityref
                           +--rw (val)?
                           |  +--:(meter-action-dscp-mark)
                           |  |  +--rw dscp-cfg
                           |  |     +--rw dscp?   inet:dscp
                           |  +--:(meter-action-drop)
                           |     +--rw drop-cfg
                           |        +--rw drop-action?   empty
                           +--rw next-meter-id?       uint16

   ietf-qos-target module contains reference of qos-policy for either
   direction of network traffic and augments ietf-interfaces [RFC7223]
   module.  Classifier counters are associated with a target.

   module: ietf-qos-target
   augment /if:interfaces/if:interface:
      +--rw qos-target-entry* [direction policy-type]
         +--rw direction                           identityref
         +--rw policy-type                         identityref
         +--rw policy-name                         string
         +--ro qos-target-classifier-statistics*
            +--ro classifier-entry-name?         string
            +--ro classifier-entry-statistics
               +--ro classified-pkts?    uint64
               +--ro classified-bytes?   uint64
               +--ro classified-rate?    uint64

   Diffserv module augments QoS classifier module.  Many of the YANG
   types defined in [RFC6991] are represented as leafs in the classifier
   module.

   Metering and marking actions are realized by augmenting the QoS
   policy-module.  Any queuing, AQM and scheduling actions are part of
   vendor specific augmentation.  Statistics are realized by augmenting
   the QoS target module.

   module: ietf-diffserv

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   augment /classifier:classifiers/classifier:classifier-entry
           /classifier:filter-entry:
      +--rw (filter-param)?
         +--:(dscp)
         |  +--rw dscp-cfg* [dscp-min dscp-max]
         |     +--rw dscp-min    inet:dscp
         |     +--rw dscp-max    inet:dscp
         +--:(source-ip-address)
         |  +--rw source-ip-address-cfg* [source-ip-addr]
         |     +--rw source-ip-addr    inet:ip-prefix
         +--:(destination-ip-address)
         |  +--rw destination-ip-address-cfg* [destination-ip-addr]
         |     +--rw destination-ip-addr    inet:ip-prefix
         +--:(source-port)
         |  +--rw source-port-cfg* [source-port-min source-port-max]
         |     +--rw source-port-min    inet:port-number
         |     +--rw source-port-max    inet:port-number
         +--:(destination-port)
         |  +--rw destination-port-cfg*
                        [destination-port-min destination-port-max]
         |     +--rw destination-port-min    inet:port-number
         |     +--rw destination-port-max    inet:port-number
         +--:(protocol)
            +--rw protocol-cfg* [protocol-min protocol-max]
               +--rw protocol-min    uint8
               +--rw protocol-max    uint8
   augment /policy:policies/policy:policy-entry/policy:classifier-entry
           /policy:classifier-action-entry-cfg:
      +--rw (action-cfg-params)?
         +--:(dscp-marking)
         |  +--rw dscp-cfg
         |     +--rw dscp?   inet:dscp
         +--:(meter)
            +--rw (meter-type)?
               +--:(srtcm)
               |  +--rw srtcm
               |     +--rw committed-rate?    uint64
               |     +--rw committed-burst?   uint64
               |     +--rw excess-burst?      uint64
               |     +--rw conform-action
               |     |  +--rw meter-action-type?   identityref
               |     |  +--rw (val)?
               |     |     +--:(meter-action-dscp-mark)
               |     |     |  +--rw dscp-cfg
               |     |     |     +--rw dscp?   inet:dscp
               |     |     +--:(meter-action-drop)
               |     |        +--rw drop-cfg
               |     |           +--rw drop-action?   empty

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               |     +--rw conform-color
               |     |  +--rw classifier-entry-name?      string
               |     |  +--rw classifier-entry-descr?     string
               |     |  +--rw classifier-entry-filter-operation?
                                                      identityref
               |     +--rw exceed-action
               |     |  +--rw meter-action-type?   identityref
               |     |  +--rw (val)?
               |     |     +--:(meter-action-dscp-mark)
               |     |     |  +--rw dscp-cfg
               |     |     |     +--rw dscp?   inet:dscp
               |     |     +--:(meter-action-drop)
               |     |        +--rw drop-cfg
               |     |           +--rw drop-action?   empty
               |     +--rw exceed-color
               |     |  +--rw classifier-entry-name?     string
               |     |  +--rw classifier-entry-descr?    string
               |     |  +--rw classifier-entry-filter-operation?
                                                    identityref
               |     +--rw violate-action
               |     |  +--rw meter-action-type?   identityref
               |     |  +--rw (val)?
               |     |     +--:(meter-action-dscp-mark)
               |     |     |  +--rw dscp-cfg
               |     |     |     +--rw dscp?   inet:dscp
               |     |     +--:(meter-action-drop)
               |     |        +--rw drop-cfg
               |     |           +--rw drop-action?   empty
               |     +--rw violate-color
               |        +--rw classifier-entry-name?      string
               |        +--rw classifier-entry-descr?     string
               |        +--rw classifier-entry-filter-operation?
                                                     identityref
               +--:(trtcm)
               |  +--rw trtcm
               |     +--rw committed-rate?    uint64
               |     +--rw committed-burst?   uint64
               |     +--rw peak-rate?         uint64
               |     +--rw peak-burst?        uint64
               |     +--rw conform-action
               |     |  +--rw meter-action-type?   identityref
               |     |  +--rw (val)?
               |     |     +--:(meter-action-dscp-mark)
               |     |     |  +--rw dscp-cfg
               |     |     |     +--rw dscp?   inet:dscp
               |     |     +--:(meter-action-drop)
               |     |        +--rw drop-cfg
               |     |           +--rw drop-action?   empty

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               |     +--rw conform-color
               |     |  +--rw classifier-entry-name?     string
               |     |  +--rw classifier-entry-descr?    string
               |     |  +--rw classifier-entry-filter-operation?
                                                     identityref
               |     +--rw exceed-action
               |     |  +--rw meter-action-type?   identityref
               |     |  +--rw (val)?
               |     |     +--:(meter-action-dscp-mark)
               |     |     |  +--rw dscp-cfg
               |     |     |     +--rw dscp?   inet:dscp
               |     |     +--:(meter-action-drop)
               |     |        +--rw drop-cfg
               |     |           +--rw drop-action?   empty
               |     +--rw exceed-color
               |     |  +--rw classifier-entry-name?      string
               |     |  +--rw classifier-entry-descr?     string
               |     |  +--rw classifier-entry-filter-operation?
                                                     identityref
               |     +--rw violate-action
               |     |  +--rw meter-action-type?   identityref
               |     |  +--rw (val)?
               |     |     +--:(meter-action-dscp-mark)
               |     |     |  +--rw dscp-cfg
               |     |     |     +--rw dscp?   inet:dscp
               |     |     +--:(meter-action-drop)
               |     |        +--rw drop-cfg
               |     |           +--rw drop-action?   empty
               |     +--rw violate-color
               |        +--rw classifier-entry-name?    string
               |        +--rw classifier-entry-descr?   string
               |        +--rw classifier-entry-filter-operation?
                                                    identityref
               +--:(generic-meter)
                  +--rw generic-meter-cfg
                     +--rw meter-list* [meter-id]
                        +--rw meter-id          uint16
                        +--rw rate-value?       uint64
                        +--rw rate-unit?        identityref
                        +--rw (burst-type)?
                        |  +--:(size)
                        |  |  +--rw burst-size?       uint64
                        |  +--:(interval)
                        |     +--rw burst-interval?   uint64
                        +--rw color
                        |  +--rw classifier-entry-name?     string
                        |  +--rw classifier-entry-descr?    string
                        |  +--rw classifier-entry-filter-operation?

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                                                        identityref
                        +--rw succeed-action
                        |  +--rw meter-action-type?   identityref
                        |  +--rw (val)?
                        |  |  +--:(meter-action-dscp-mark)
                        |  |  |  +--rw dscp-cfg
                        |  |  |     +--rw dscp?   inet:dscp
                        |  |  +--:(meter-action-drop)
                        |  |     +--rw drop-cfg
                        |  |        +--rw drop-action?   empty
                        |  +--rw next-meter-id?       uint16
                        +--rw fail-action
                           +--rw meter-action-type?   identityref
                           +--rw (val)?
                           |  +--:(meter-action-dscp-mark)
                           |  |  +--rw dscp-cfg
                           |  |     +--rw dscp?   inet:dscp
                           |  +--:(meter-action-drop)
                           |     +--rw drop-cfg
                           |        +--rw drop-action?   empty
                           +--rw next-meter-id?       uint16
   augment /if:interfaces/if:interface/target:qos-target-entry
           /target:qos-target-classifier-statistics:
      +--ro diffserv-action-statistics
         +--ro generic-meter-statistics* [meter-id]
         |  +--ro meter-id         uint16
         |  +--ro metered-pkts?    uint64
         |  +--ro metered-bytes?   uint64
         |  +--ro metered-rate?    uint64
         +--ro srtcm-meter-statistics
         |  +--ro conform-pkts?    uint64
         |  +--ro conform-bytes?   uint64
         |  +--ro conform-rate?    uint64
         |  +--ro exceed-pkts?     uint64
         |  +--ro exceed-bytes?    uint64
         |  +--ro exceed-rate?     uint64
         |  +--ro violate-pkts?    uint64
         |  +--ro violate-bytes?   uint64
         |  +--ro violate-rate?    uint64
         +--ro trtcm-meter-statistics
            +--ro conform-pkts?    uint64
            +--ro conform-bytes?   uint64
            +--ro conform-rate?    uint64
            +--ro exceed-pkts?     uint64
            +--ro exceed-bytes?    uint64
            +--ro exceed-rate?     uint64
            +--ro violate-pkts?    uint64
            +--ro violate-bytes?   uint64

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            +--ro violate-rate?    uint64

6.  Modules

6.1.  IETF-QOS-CLASSIFIER

   <CODE BEGINS>file "ietf-qos-classifier@2016-03-03.yang"

   module ietf-qos-classifier {
     yang-version 1;
     namespace "urn:ietf:params:xml:ns:yang:ietf-qos-classifier";
     prefix classifier;

     import ietf-inet-types {
       prefix inet;
     }

     organization "IETF NETMOD (Netmod Working Group) Working Group";
     contact
       "WG Web:   <http://tools.ietf.org/wg/netmod/>
        WG List:  <mailto:netmod@ietf.org>

        WG Chair: Jurgen Schonwalder
                  <mailto:j.schoenwaelder@jacobs-university.de>

        WG Chair: Lou Berger
                  <mailto:lberger@labn.net>

        WG Chair: Kent Watsen
                  <mailto:kwatsen@juniper.net>

        Editor:   Aseem Choudhary
                  <mailto:asechoud@cisco.com>

        Editor:   Mahesh Jethanandani
                  <mailto:mjethanandani@gmail.com>";

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

        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

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        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 2016-03-03 {
       description
         "Latest revision of qos base classifier module";
       reference "RFC XXXX";
     }

     feature policy-inline-classifier-config {
       description
         " This feature allows classifier configuration
           directly under policy.";
     }

     identity filter-type {
       description
         "This is identity of base filter-type";
     }

     identity dscp {
       base filter-type;
       description
         "Differentiated services code point filter-type";
     }

     identity source-ip-address {
       base filter-type;
       description
         "source ipv4 and ipv6 address filter-type";
     }

     identity destination-ip-address {
       base filter-type;
       description
         "destination ipv4 and ipv6 address filter-type";
     }

     identity source-port {
       base filter-type;
       description
         "source port filter-type";
     }

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     identity destination-port {
       base filter-type;
       description
         "destination port filter-type";
     }

     identity protocol {
       base filter-type;
       description
         "protocol type filter-type";
     }

     identity classifier-entry-filter-operation-type {
       description
         "Classifier entry filter logical operation";
     }

     identity match-any-filter {
       base classifier-entry-filter-operation-type;
       description
         "Classifier entry filter logical OR operation";
     }

     identity match-all-filter {
       base classifier-entry-filter-operation-type;
       description
         "Classifier entry filter logical AND operation";
     }

     grouping dscp-cfg {
       list dscp-cfg {
         key "dscp-min dscp-max";
         description
           "list of dscp ranges";
         leaf dscp-min {
           type inet:dscp;
           description
             "Minimum value of dscp min-max range";
         }
         leaf dscp-max {
           type inet:dscp;
           description
             "maximum value of dscp min-max range";
         }
       }
       description
         "Filter grouping containing list of dscp ranges";
     }

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     grouping source-ip-address-cfg {
       list source-ip-address-cfg {
         key "source-ip-addr";
         description
           "list of source ipv4 or ipv6 address";
         leaf source-ip-addr {
           type inet:ip-prefix;
           description
             "source ipv4 or ipv6 prefix";
         }
       }
       description
         "Filter grouping containing list of source ip addresses";
     }

     grouping destination-ip-address-cfg {
       list destination-ip-address-cfg {
         key "destination-ip-addr";
         description
           "list of destination ipv4 or ipv6 address";
         leaf destination-ip-addr {
           type inet:ip-prefix;
           description
             "destination ipv4 or ipv6 prefix";
         }
       }
       description
         "Filter grouping containing list of destination ip address";
     }

     grouping source-port-cfg {
       list source-port-cfg {
         key "source-port-min source-port-max";
         description
           "list of ranges of source port";
         leaf source-port-min {
           type inet:port-number;
           description
             "minimum value of source port range";
         }
         leaf source-port-max {
           type inet:port-number;
           description
             "maximum value of source port range";
         }
       }
       description
         "Filter grouping containing list of source port ranges";

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     }

     grouping destination-port-cfg {
       list destination-port-cfg {
         key "destination-port-min destination-port-max";
         description
           "list of ranges of destination port";
         leaf destination-port-min {
           type inet:port-number;
           description
             "minimum value of destination port range";
         }
         leaf destination-port-max {
           type inet:port-number;
           description
             "maximum value of destination port range";
         }
       }
       description
         "Filter grouping containing list of destination port ranges";
     }

     grouping protocol-cfg {
       list protocol-cfg {
         key "protocol-min protocol-max";
         description
           "list of ranges of protocol values";
         leaf protocol-min {
           type uint8 {
             range "0..255";
           }
           description
             "minimum value of protocol range";
         }
         leaf protocol-max {
           type uint8 {
             range "0..255";
           }
           description
             "maximum value of protocol range";
         }
       }
       description
         "Filter grouping containing list of Protocol ranges";
     }

     grouping filters {
       description

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         "Filters types in a Classifier entry";
       leaf filter-type {
         type identityref {
           base filter-type;
         }
         description
           "This leaf defines type of the filter";
       }
       leaf filter-logical-not {
         type boolean;
         description
           "
            This is logical-not operator for a filter. When true, it
            indicates filter looks for absence of a pattern defined
            by the filter
           ";
       }
     }

     grouping classifier-entry-generic-attr {
       description
         "
          Classifier generic attributes like name,
          description, operation type
         ";
       leaf classifier-entry-name {
         type string;
         description
           "classifier entry name";
       }
       leaf classifier-entry-descr {
         type string;
         description
           "classifier entry description statement";
       }
       leaf classifier-entry-filter-operation {
         type identityref {
           base classifier-entry-filter-operation-type;
         }
         default "match-any-filter";
         description
           "Filters are applicable as match-any or match-all filters";
       }
     }

     grouping classifier-entry-inline-attr {
       description
         "attributes of inline classifier in a policy";

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       leaf classifier-entry-inline {
         type boolean;
         default "false";
         description
           "Indication of inline classifier entry";
       }
       leaf classifier-entry-filter-oper {
         type identityref {
           base classifier-entry-filter-operation-type;
         }
         default "match-all-filter";
         description
           "Filters are applicable as match-any or match-all filters";
       }
       list filter-entry {
         if-feature policy-inline-classifier-config;
         must "classifier-entry-inline == true" {
           description
             "For inline filter configuration, inline attribute
              must be true";
         }
         key "filter-type filter-logical-not";
         uses filters;
         description
           "Filters configured inline in a policy";
       }
     }

     container classifiers {
       description
         "list of classifier entry";
       list classifier-entry {
         key "classifier-entry-name";
         description
           "each classifier entry contains a list of filters";
         uses classifier-entry-generic-attr;
         list filter-entry {
           key "filter-type filter-logical-not";
           uses filters;
           description
             "Filter entry configuration";
         }
       }
     }
   }

   <CODE ENDS>

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6.2.  IETF-QOS-POLICY

   <CODE BEGINS>file "ietf-qos-policy@2016-03-03.yang"

   module ietf-qos-policy {
     yang-version 1;
     namespace "urn:ietf:params:xml:ns:yang:ietf-qos-policy";
     prefix policy;

     import ietf-qos-classifier {
       prefix classifier;
     }

     organization "IETF NETMOD (Netmod Working Group) Working Group";
     contact
       "WG Web:   <http://tools.ietf.org/wg/netmod/>
        WG List:  <mailto:netmod@ietf.org>

        WG Chair: Jurgen Schonwalder
                  <mailto:j.schoenwaelder@jacobs-university.de>

        WG Chair: Lou Berger
                  <mailto:lberger@labn.net>

        WG Chair: Kent Watsen
                  <mailto:kwatsen@juniper.net>

        Editor:   Aseem Choudhary
                  <mailto:asechoud@cisco.com>

        Editor:   Mahesh Jethanandani
                  <mailto:mjethanandani@gmail.com>";

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

        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).

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

     revision 2016-03-03 {
       description
         "Latest revision of qos policy";
       reference "RFC XXXX";
     }

     identity policy-type {
       description
         "This base identity type defines policy-types";
     }

     grouping policy-generic-attr {
       description
         "Policy Attributes";
       leaf policy-name {
         type string;
         description
           "policy name";
       }
       leaf policy-type {
         type identityref {
           base policy-type;
         }
         description
           "policy type";
       }
       leaf policy-descr {
         type string;
         description
           "policy description";
       }
     }

     identity action-type {
       description
         "This base identity type defines action-types";
     }

     grouping classifier-action-entry-cfg {
       description
         "List of Configuration of classifier & associated actions";
       list classifier-action-entry-cfg {
         key "action-type";
         ordered-by user;
         description

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           "Configuration of classifier & associated actions";
         leaf action-type {
           type identityref {
             base action-type;
           }
           description
             "This defines action type ";
         }
         choice action-cfg-params {
           description
             "Choice of action types";
         }
       }
     }

     container policies {
       description
         "list of policy templates";
       list policy-entry {
         key "policy-name policy-type";
         description
           "policy template";
         uses policy-generic-attr;
         list classifier-entry {
           key "classifier-entry-name";
           ordered-by user;
           description
             "Classifier entry configuration in a policy";
           leaf classifier-entry-name {
             type string;
             description
               "classifier entry name";
           }
           uses classifier:classifier-entry-inline-attr;
           uses classifier-action-entry-cfg;
         }
       }
     }
   }

   <CODE ENDS>

6.3.  IETF-QOS-ACTION

   <CODE BEGINS>file "ietf-qos-action@2016-03-03.yang"

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   module ietf-qos-action {
     namespace "urn:ietf:params:xml:ns:yang:ietf-qos-action";
     prefix action;

     import ietf-inet-types {
       prefix inet;
     }
     import ietf-qos-classifier {
       prefix classifier;
     }
     import ietf-qos-policy {
       prefix policy;
     }

     organization "IETF NETMOD (Netmod Working Group) Working Group";
     contact
       "WG Web:   <http://tools.ietf.org/wg/netmod/>
        WG List:  <mailto:netmod@ietf.org>

        WG Chair: Jurgen Schonwalder
                  <mailto:j.schoenwaelder@jacobs-university.de>

        WG Chair: Lou Berger
                  <mailto:lberger@labn.net>

        WG Chair: Kent Watsen
                  <mailto:kwatsen@juniper.net>

        Editor:   Aseem Choudhary
                  <mailto:asechoud@cisco.com>

        Editor:   Mahesh Jethanandani
                  <mailto:mjethanandani@gmail.com>";

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

        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).

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

     revision 2016-03-03 {
       description
         "Latest revision for qos actions";
       reference "RFC XXXX";
     }

     feature meter-template-support {
       description
         " This feature allows support of meter-template.";
     }

     grouping burst {
       description
         "burst size or interval configuration";
       choice burst-type {
         case size {
           leaf burst-size {
             type uint64;
             units "bytes";
             description
               "burst size";
           }
         }
         case interval {
           leaf burst-interval {
             type uint64;
             units "microsecond";
             description
               "burst interval";
           }
         }
         description
           "Choice of burst type";
       }
     }

     grouping threshold {
       description
         "Threshold Parameters";
       container threshold {
         description
           "threshold";
         choice threshold-type {
           case size {
             leaf threshold-size {

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               type uint64;
               units "bytes";
               description
                 "Threshold size";
             }
           }
           case interval {
             leaf threshold-interval {
               type uint64;
               units "microsecond";
               description
                 "Threshold interval";
             }
           }
           description
             "Choice of threshold type";
         }
       }
     }

     identity rate-unit-type {
       description
         "base rate-unit type";
     }

     identity bits-per-second {
       base rate-unit-type;
       description
         "bits per second identity";
     }

     identity kilo-bits-per-second {
       base rate-unit-type;
       description
         "kilo bits per second identity";
     }

     identity mega-bits-per-second {
       base rate-unit-type;
       description
         "mega bits per second identity";
     }

     identity giga-bits-per-second {
       base rate-unit-type;
       description
         "mega bits per second identity";
     }

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     identity percent {
       base rate-unit-type;
       description
         "percentage";
     }

     grouping rate-value-unit {
       leaf rate-value {
         type uint64;
         description
           "rate value";
       }
       leaf rate-unit {
         type identityref {
           base rate-unit-type;
         }
         description
           "rate unit";
       }
       description
         "rate value and unit grouping";
     }

     identity queue {
       base policy:action-type;
       description
         "queue action type";
     }

     identity dscp-marking {
       base policy:action-type;
       description
         "dscp marking action type";
     }

     identity meter {
       base policy:action-type;
       description
         "meter action type";
     }

     identity srtcm-meter {
       base policy:action-type;
       description
         "single rate three color meter action type";
     }

     identity trtcm-meter {

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       base policy:action-type;
       description
         "two rate three color meter action type";
     }

     identity schedular {
       base policy:action-type;
       description
         "schedular action type";
     }

     identity always-drop {
       base policy:action-type;
       description
         "always drop algorithm";
     }

     identity tail-drop {
       base policy:action-type;
       description
         "tail drop algorithm";
     }

     identity random-detect {
       base policy:action-type;
       description
         "random detect algorithm";
     }

     identity meter-action-type {
       description
         "action type in a meter";
     }

     identity meter-action-drop {
       base meter-action-type;
       description
         "drop action type in a meter";
     }

     identity meter-action-dscp-set {
       base meter-action-type;
       description
         "dscp mark action type in a meter";
     }

     grouping drop {
       container drop-cfg {

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         leaf drop-action {
           type empty;
           description
             "always drop algorithm";
         }
         description
           "the drop action";
       }
       description
         "always drop grouping";
     }

     grouping queuelimit {
       container qlimit-thresh {
         uses threshold;
         description
           "the queue limit";
       }
       description
         "the queue limit beyond which queue will not hold any packet";
     }

     grouping meter-action-params {
       leaf meter-action-type {
         type identityref {
           base meter-action-type;
         }
         description
           "meter action type";
       }
       choice val {
         case meter-action-dscp-mark {
           uses dscp-marking;
           description
             "meter action: mark";
         }
         case meter-action-drop {
           description
             "meter action: drop";
           uses drop;
         }
         description
           " meter action based on choice of meter action type";
       }
       description
         "meter action parameters";
     }

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     grouping generic-meter {
       leaf meter-id {
         type uint16;
         description
           "meter identifier";
       }
       uses rate-value-unit;
       uses burst;
       container color {
         uses classifier:classifier-entry-generic-attr;
         description
           "color aware & color blind attributes container";
       }
       container succeed-action {
         uses meter-action-params;
         leaf next-meter-id {
           type uint16;
           description
             "next meter identifier";
         }
         description
           "confirm action";
       }
       container fail-action {
         uses meter-action-params;
         leaf next-meter-id {
           type uint16;
           description
             "next meter identifier";
         }
         description
           "exceed action";
       }
       description
         "meter attributes";
     }

     grouping one-rate-tri-color-meter {
       container srtcm {
         leaf committed-rate {
           type uint64;
           units "bits-per-second";
           description
             "committed meter rate";
         }
         leaf committed-burst {
           type uint64;
           units "byes";

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           description
             "commited burst size";
         }
         leaf excess-burst {
           type uint64;
           units "byes";
           description
             "excess burst size";
         }
         container conform-action {
           uses meter-action-params;
           description
             "conform action";
         }
         container conform-color {
           uses classifier:classifier-entry-generic-attr;
           description
             "color aware & color blind attributes container";
         }
         container exceed-action {
           uses meter-action-params;
           description
             "exceed action";
         }
         container exceed-color {
           uses classifier:classifier-entry-generic-attr;
           description
             "color aware & color blind attributes container";
         }
         container violate-action {
           uses meter-action-params;
           description
             "violate action";
         }
         container violate-color {
           uses classifier:classifier-entry-generic-attr;
           description
             "color aware & color blind attributes container";
         }
         description
           "one-rate-tri-color-meter attributes";
       }
       description
         "one-rate-tri-color-meter grouping";
     }

     grouping two-rate-tri-color-meter {
       container trtcm {

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         leaf committed-rate {
           type uint64;
           units "bits-per-second";
           description
             "committed meter rate";
         }
         leaf committed-burst {
           type uint64;
           units "byes";
           description
             "commited burst size";
         }
         leaf peak-rate {
           type uint64;
           units "bits-per-second";
           description
             "peak meter rate";
         }
         leaf peak-burst {
           type uint64;
           units "byes";
           description
             "peak burst size";
         }
         container conform-action {
           uses meter-action-params;
           description
             "conform action";
         }
         container conform-color {
           uses classifier:classifier-entry-generic-attr;
           description
             "color aware & color blind attributes container";
         }
         container exceed-action {
           uses meter-action-params;
           description
             "exceed action";
         }
         container exceed-color {
           uses classifier:classifier-entry-generic-attr;
           description
             "color aware & color blind attributes container";
         }
         container violate-action {
           uses meter-action-params;
           description
             "violate action";

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         }
         container violate-color {
           uses classifier:classifier-entry-generic-attr;
           description
             "color aware & color blind attributes container";
         }
         description
           "two-rate-tri-color-meter attributes";
       }
       description
         "two-rate-tri-color-meter grouping";
     }

     grouping priority {
       container priority-cfg {
         leaf priority-level {
           type uint8;
           description
             "priority level";
         }
         description
           "priority attributes";
       }
       description
         "priority attributes grouping";
     }

     grouping min-rate {
       container min-rate-cfg {
         uses rate-value-unit;
         description
           "min guaranteed bandwidth";
       }
       description
         "minimum rate grouping";
     }

     grouping dscp-marking {
       container dscp-cfg {
         leaf dscp {
           type inet:dscp;
           description
             "dscp marking";
         }
         description
           "dscp marking container";
       }
       description

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         "dscp marking grouping";
     }

     grouping max-rate {
       container max-rate-cfg {
         uses rate-value-unit;
         uses burst;
         description
           "maximum rate attributes container";
       }
       description
         "maximum rate attributes";
     }

     grouping queue {
       container queue-cfg {
         uses priority;
         uses min-rate;
         uses max-rate;
         container algorithmic-drop-cfg {
           choice drop-algorithm {
             case always-drop {
               uses drop;
               description
                 "Always Drop configuration container";
             }
             case tail-drop {
               container tail-drop-cfg {
                 uses queuelimit;
                 description
                   "Tail Drop configuration container";
               }
             }
             description
               "Choice of Drop Algorithm";
           }
           description
             "Algorithmic Drop configuration container";
         }
         description
           "Queue configuration container";
       }
       description
         "Queue configuration grouping";
     }

     grouping schedular {
       container schedular-cfg {

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         uses min-rate;
         uses max-rate;
         description
           "Schedular configuration container";
       }
       description
         "Schedular configuration grouping";
     }

     grouping generic-metering {
       container generic-meter-cfg {
         list meter-list {
           key "meter-id";
           uses generic-meter;
           description
             "Generic Meter configuration";
         }
         description
           "Generic Meter list configuration container";
       }
       description
         "Generic Meter configuration container grouping";
     }

     grouping metering {
       choice meter-type {
         case srtcm {
           uses one-rate-tri-color-meter;
           description
             "one rate tri-color meter";
         }
         case trtcm {
           uses two-rate-tri-color-meter;
           description
             "two rate tri-color meter";
         }
         case generic-meter {
           uses generic-metering;
           description
             "generic meter";
         }
         description
           " meter action based on choice of meter action type";
       }
       description
         "meter attributes";
     }

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     container meter-template {
       if-feature meter-template-support;
       description
         "list of meter-entry templates";
       list meter-entry {
         key "meter-name";
         description
           "meter entry template";
         leaf meter-name {
           type string;
           description
             "basic meter identifier";
         }
         uses metering;
       }
     }
   }
   <CODE ENDS>

6.4.  IETF-QOS-TARGET

   <CODE BEGINS>file "ietf-qos-target@2016-03-03.yang"

   module ietf-qos-target {
     yang-version 1;
     namespace "urn:ietf:params:xml:ns:yang:ietf-qos-target";
     prefix target;

     import ietf-interfaces {
       prefix if;
     }
     import ietf-qos-policy {
       prefix policy;
     }

     organization "IETF NETMOD (Netmod Working Group) Working Group";
     contact
       "WG Web:   <http://tools.ietf.org/wg/netmod/>
        WG List:  <mailto:netmod@ietf.org>

        WG Chair: Jurgen Schonwalder
                  <mailto:j.schoenwaelder@jacobs-university.de>

        WG Chair: Lou Berger
                  <mailto:lberger@labn.net>

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        WG Chair: Kent Watsen
                  <mailto:kwatsen@juniper.net>

        Editor:   Aseem Choudhary
                  <mailto:asechoud@cisco.com>

        Editor:   Mahesh Jethanandani
                  <mailto:mjethanandani@gmail.com";

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

        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 2016-03-03 {
       description
         "Latest revision qos based policy applied to a target";
       reference "RFC XXXX";
     }

     identity direction {
       description
         "This is identity of traffic direction";
     }

     identity inbound {
       base direction;
       description
         "Direction of traffic coming into the network entry";
     }

     identity outbound {
       base direction;
       description
         "Direction of traffic going out of the network entry";
     }

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     feature target-inline-policy-config {
       description
         "This feature allows the policy configuration
          directly under a target.";
     }

     grouping wred-stats {
       description
         "WRED Counters";
       leaf early-drop-pkts {
         type uint64;
         description
           "Early drop packets ";
       }
       leaf early-drop-bytes {
         type uint64;
         description
           "Early drop bytes ";
       }
     }

     grouping classifier-entry-stats {
       description
         "Classifier Counters";
       container classifier-entry-statistics {
         config false;
         description
           "
            This group defines the classifier filter statistics of
            each classifier entry

           ";
         leaf classified-pkts {
           type uint64;
           description
             " Number of total packets which filtered
               to the classifier-entry";
         }
         leaf classified-bytes {
           type uint64;
           description
             " Number of total bytes which filtered
               to the classifier-entry";
         }
         leaf classified-rate {
           type uint64;
           units "bits-per-second";
           description

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             " Rate of average data flow through the
               classifier-entry";
         }
       }
     }

     grouping queuing-stats {
       description
         "Queuing Counters";
       container queuing-statistics {
         description
           "queue related statistics ";
         leaf output-pkts {
           type uint64;
           description
             "Number of packets transmitted from queue ";
         }
         leaf output-bytes {
           type uint64;
           description
             "Number of bytes transmitted from queue ";
         }
         leaf queue-size-pkts {
           type uint64;
           description
             "Number of packets currently buffered ";
         }
         leaf queue-size-bytes {
           type uint64;
           description
             "Number of bytes currently buffered ";
         }
         leaf drop-pkts {
           type uint64;
           description
             "Total number of packets dropped ";
         }
         leaf drop-bytes {
           type uint64;
           description
             "Total number of bytes dropped ";
         }
         container wred-stats {
           uses wred-stats;
           description
             "Container for WRED statistics";
         }
       }

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     }

     grouping tri-color-marking-meter-stats {
       description
         "Tri-Colur-Marking Metering Counters";
       leaf conform-pkts {
         type uint64;
         description
           "Number of conform packets";
       }
       leaf conform-bytes {
         type uint64;
         description
           "Bytes of conform packets";
       }
       leaf conform-rate {
         type uint64;
         units "bits-per-second";
         description
           "Traffic Rate measured as conformimg";
       }
       leaf exceed-pkts {
         type uint64;
         description
           "Number of packets counted as exceeding";
       }
       leaf exceed-bytes {
         type uint64;
         description
           "Bytes of packets counted as exceeding";
       }
       leaf exceed-rate {
         type uint64;
         units "bits-per-second";
         description
           "Traffic Rate measured as exceeding";
       }
       leaf violate-pkts {
         type uint64;
         description
           "Number of packets counted as violating";
       }
       leaf violate-bytes {
         type uint64;
         description
           "Bytes of packets counted as violating";
       }
       leaf violate-rate {

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         type uint64;
         units "bits-per-second";
         description
           "Traffic Rate measured as violating";
       }
     }

     grouping meter-stats {
       description
         "Metering Counters";
       list generic-meter-statistics {
         key "meter-id";
         description
           "Meter statistics";
         leaf meter-id {
           type uint16;
           description
             "Meter Identifier";
         }
         leaf metered-pkts {
           type uint64;
           description
             "Number of packets counted by the meter";
         }
         leaf metered-bytes {
           type uint64;
           description
             "Bytes of packets counted by the meter";
         }
         leaf metered-rate {
           type uint64;
           units "bits-per-second";
           description
             "Traffic Rate measured by the meter";
         }
       }
       container srtcm-meter-statistics {
         uses tri-color-marking-meter-stats;
         description
           "Srtcm meter statistics";
       }
       container trtcm-meter-statistics {
         uses tri-color-marking-meter-stats;
         description
           "Trtcm meter statistics";
       }
     }

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     augment "/if:interfaces/if:interface" {
       description
         "Augments Diffserv Target Entry to Interface module";
       list qos-target-entry {
         key "direction policy-type";
         description
           "policy target for inbound or outbound direction";
         leaf direction {
           type identityref {
             base direction;
           }
           description
             "Direction fo the traffic flow either inbound or outbound";
         }
         leaf policy-type {
           type identityref {
             base policy:policy-type;
           }
           description
             "Policy entry type";
         }
         leaf policy-name {
           type string;
           mandatory true;
           description
             "Policy entry name";
         }
         list qos-target-classifier-statistics {
           config false;
           description
             "Statistics for each Classifier Entry in a Policy";
           leaf classifier-entry-name {
             type string;
             description
               "Classifier Entry Name";
           }
           uses classifier-entry-stats;
         }
       }
     }
   }

   <CODE ENDS>

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6.5.  IETF-DIFFSERV

   <CODE BEGINS>file "ietf-diffserv@2016-03-03.yang"

   module ietf-diffserv {
     yang-version 1;
     namespace "urn:ietf:params:xml:ns:yang:ietf-diffserv";
     prefix diffserv;

     import ietf-interfaces {
       prefix if;
     }
     import ietf-qos-classifier {
       prefix classifier;
     }
     import ietf-qos-policy {
       prefix policy;
     }
     import ietf-qos-action {
       prefix action;
     }
     import ietf-qos-target {
       prefix target;
     }

     organization "IETF NETMOD (Netmod Working Group) Working Group";
     contact
       "WG Web:   <http://tools.ietf.org/wg/netmod/>
        WG List:  <mailto:netmod@ietf.org>

        WG Chair: Jurgen Schonwalder
                  <mailto:j.schoenwaelder@jacobs-university.de>

        WG Chair: Lou Berger
                  <mailto:lberger@labn.net>

        WG Chair: Kent Watsen
                  <mailto:kwatsen@juniper.net>

        Editor:   Aseem Choudhary
                  <mailto:asechoud@cisco.com>

        Editor:   Mahesh Jethanandani
                  <mailto:mjethanandani@gmail.com";

     description
       "This module contains a collection of YANG definitions for

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        configuring diffserv specification implementations.

        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 2016-03-03 {
       description
         "Latest revision of diffserv based classifier";
       reference "RFC XXXX";
     }

     augment "/classifier:classifiers/classifier:classifier-entry/" +
             "classifier:filter-entry" {
       choice filter-param {
         description
           "Choice of filter types";
         case dscp {
           uses classifier:dscp-cfg;
           description
             "Filter containing list of dscp ranges";
         }
         case source-ip-address {
           uses classifier:source-ip-address-cfg;
           description
             "Filter containing list of source ip addresses";
         }
         case destination-ip-address {
           uses classifier:destination-ip-address-cfg;
           description
             "Filter containing list of destination ip address";
         }
         case source-port {
           uses classifier:source-port-cfg;
           description
             "Filter containing list of source-port ranges";
         }
         case destination-port {
           uses classifier:destination-port-cfg;

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           description
             "Filter containing list of destination-port ranges";
         }
         case protocol {
           uses classifier:protocol-cfg;
           description
             "Filter Type Protocol";
         }
       }
       description
         "augments diffserv filters to qos classifier";
     }
     augment "/policy:policies/policy:policy-entry/" +
             "policy:classifier-entry/" +
             "policy:classifier-action-entry-cfg" {
       choice action-cfg-params {
         description
           "Choice of action types";
         case dscp-marking {
           uses action:dscp-marking;
         }
         case meter {
           uses action:metering;
         }
       }
       description
         "augments dscp-marking and meter to qos policy";
     }
     augment "/if:interfaces/if:interface/target:qos-target-entry/" +
             "target:qos-target-classifier-statistics" {
       container diffserv-action-statistics {
         uses target:meter-stats;
         description
           "meter statistics";
       }
       description
         "augments meter stats to qos target module";
     }
   }

   <CODE ENDS>

7.  Security Considerations

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8.  Acknowledgement

   The editors of this document wishes to thank Fred Baker for
   overviewing the document and provide useful comments, Andrew Mao for
   the guidance and support, Fred Yip and Aleksandr Zhdankin for helpful
   suggestions and contributions.

9.  References

9.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <http://www.rfc-editor.org/info/rfc2119>.

   [RFC2697]  Heinanen, J. and R. Guerin, "A Single Rate Three Color
              Marker", RFC 2697, DOI 10.17487/RFC2697, September 1999,
              <http://www.rfc-editor.org/info/rfc2697>.

   [RFC2698]  Heinanen, J. and R. Guerin, "A Two Rate Three Color
              Marker", RFC 2698, DOI 10.17487/RFC2698, September 1999,
              <http://www.rfc-editor.org/info/rfc2698>.

   [RFC3289]  Baker, F., Chan, K., and A. Smith, "Management Information
              Base for the Differentiated Services Architecture",
              RFC 3289, DOI 10.17487/RFC3289, May 2002,
              <http://www.rfc-editor.org/info/rfc3289>.

   [RFC6020]  Bjorklund, M., Ed., "YANG - A Data Modeling Language for
              the Network Configuration Protocol (NETCONF)", RFC 6020,
              DOI 10.17487/RFC6020, October 2010,
              <http://www.rfc-editor.org/info/rfc6020>.

   [RFC6991]  Schoenwaelder, J., Ed., "Common YANG Data Types",
              RFC 6991, DOI 10.17487/RFC6991, July 2013,
              <http://www.rfc-editor.org/info/rfc6991>.

   [RFC7223]  Bjorklund, M., "A YANG Data Model for Interface
              Management", RFC 7223, DOI 10.17487/RFC7223, May 2014,
              <http://www.rfc-editor.org/info/rfc7223>.

9.2.  Informative References

   [RFC2475]  Blake, S., Black, D., Carlson, M., Davies, E., Wang, Z.,
              and W. Weiss, "An Architecture for Differentiated
              Services", RFC 2475, DOI 10.17487/RFC2475, December 1998,
              <http://www.rfc-editor.org/info/rfc2475>.

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Appendix A.  Open Items

   The current model represents hierarchical QoS with leaf and non-leaf
   nodes in a scheduling hierarchy without any restrictions of actions,
   such as AQM.  Normally, that should not be allowed at non-leaf nodes.
   This will be addressed in a subsequent revision.

Appendix B.  Company A example

   Company A Diffserv module 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.  Queuing and
   metering counters are realized by augmenting of the QoS target
   module.

B.1.  EXAMPLE-COMPA-DIFFSERV

   module example-compa-diffserv {
     namespace "urn:ietf:params:xml:ns:yang:example-compa-diffserv";
     prefix example;

     import ietf-interfaces {
       prefix if;
     }
     import ietf-qos-classifier {
       prefix classifier;
     }
     import ietf-qos-policy {
       prefix policy;
     }
     import ietf-qos-action {
       prefix action;
     }
     import ietf-qos-target {
       prefix target;
     }
     import ietf-diffserv {
       prefix diffserv;
     }

     organization "Company A";
     contact
       "Editor:   XYZ
                 <mailto:xyz@compa.com>";
     description
       "This module contains a collection of YANG definitions of
        companyA diffserv specification extension.";

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     revision 2016-03-03 {
       description
         "Initial revision for diffserv actions on network packets";
       reference
         "RFC 6020: YANG - A Data Modeling Language for the
                    Network Configuration Protocol (NETCONF)";
     }

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

     identity min-rate {
       base policy:action-type;
       description
         "min-rate action type";
     }

     identity max-rate {
       base policy:action-type;
       description
         "max-rate action type";
     }

     identity child-policy {
       base policy:action-type;
       description
         "child-policy action type";
     }

     identity qos-group {
       base classifier:filter-type;
       description
         "qos-group filter-type";
     }

     grouping qos-group-cfg {
       list qos-group-cfg {
         key "qos-group-min qos-group-max";
         description
           "list of dscp ranges";
         leaf qos-group-min {
           type uint8;
           description
             "Minimum value of qos-group range";
         }

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         leaf qos-group-max {
           type uint8;
           description
             "maximum value of qos-group range";
         }
       }
       description
         "Filter containing list of qos-group ranges";
     }

     grouping wred-threshold {
       container wred-min-thresh {
         uses action:threshold;
         description
           "Minimum threshold";
       }
       container wred-max-thresh {
         uses action:threshold;
         description
           "Maximum threshold";
       }
       leaf mark-probability {
         type uint32 {
           range "1..1000";
         }
         description
           "Mark probability";
       }
       description
         "WRED threshold attributes";
     }

     grouping randomdetect {
       leaf exp-weighting-const {
         type uint32;
         description
           "Exponential weighting constant factor for wred profile ";
       }
       uses wred-threshold;
       description
         "Random detect attributes";
     }

     augment "/classifier:classifiers/classifier:classifier-entry/" +
             "classifier:filter-entry/diffserv:filter-param" {
       case qos-group {
         uses qos-group-cfg;
         description

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           "Filter containing list of qos-group ranges.
            Qos-group represent packet metadata information
            in a device. ";
       }
       description
         "augmentation of classifier filters";
     }
     augment "/policy:policies/policy:policy-entry/" +
             "policy:classifier-entry/" +
             "policy:classifier-action-entry-cfg/" +
             "diffserv:action-cfg-params" {
       case priority {
         uses action:priority;
       }
       case min-rate {
         uses action:min-rate;
       }
       case max-rate {
         uses action:max-rate;
       }
       case random-detect {
         uses randomdetect;
       }
       case child-policy {
         leaf child-policy {
           type leafref {
             path "/policy:policies/policy:policy-entry/" +
                  "policy:policy-name";
           }
           description
             "Child Policy in the hierarchial configuration";
         }
       }
       description
         "Augment the actions to policy entry";
     }
     augment "/if:interfaces/if:interface/target:qos-target-entry/" +
             "target:qos-target-classifier-statistics/" +
             "diffserv:diffserv-action-statistics" {
       uses target:queuing-stats;
       description
         "Augment the statistics to policy entry";
     }
     augment "/if:interfaces/if:interface/target:qos-target-entry/" +
             "target:qos-target-classifier-statistics" {
       leaf relative-path {
         type string;
         description

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           "Relative Path of the classifier entry in the
            hierarchial policy";
       }
       description
         "Augment the statistics to policy entry";
     }
   }

Authors' Addresses

   Aseem Choudhary
   Cisco Systems
   170 W. Tasman Drive
   San Jose, CA  95134
   US

   Email: asechoud@cisco.com

   Mahesh Jethanandani
   Cisco Systems
   170 W. Tasman Drive
   San Jose, CA  95134
   US

   Email: mjethanandani@gmail.com

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