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Versions: 00 01 02 03

Network Working Group                                       A. Choudhary
Internet-Draft                                                   S. Shah
Intended status: Standards Track                           Cisco Systems
Expires: December 26, 2015                               M. Jethanandani
                                                       Ciena Corporation
                                                                  Y. Yan
                                                                  B. Liu
                                                     Huawei Technologies
                                                              N. Strahle
                                                        Juniper Networks
                                                           June 24, 2015


                        YANG Model for Diffserv
                draft-asechoud-netmod-diffserv-model-03

Abstract

   This document describes a YANG model of Differentiated Services for
   configuration and operations.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on December 26, 2015.

Copyright Notice

   Copyright (c) 2015 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect



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   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Diffserv Model Design . . . . . . . . . . . . . . . . . . . .   3
   4.  Diffserv Model  . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Diffserv Modules  . . . . . . . . . . . . . . . . . . . . . .   9
     5.1.  IETF-DIFFSERV-CLASSIFIER  . . . . . . . . . . . . . . . .   9
     5.2.  IETF-DIFFSERV-POLICY  . . . . . . . . . . . . . . . . . .  16
     5.3.  IETF-DIFFSERV-ACTION  . . . . . . . . . . . . . . . . . .  19
     5.4.  IETF-DIFFSERV-TARGET  . . . . . . . . . . . . . . . . . .  28
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  34
   7.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .  34
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  34
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  34
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  35
   Appendix A.  Open Items . . . . . . . . . . . . . . . . . . . . .  35
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  35

1.  Introduction

   This document defines a YANG [RFC6020] data model for the
   configuration, state data of Differentiated Services.  Any RPC or
   notification definition is not part of this document.  As many
   vendors have different object constructs to represent the same data,
   it has been tried to design this model in a very flexible, extensible
   and generic way to fit into most of the vendor requirements.  The
   model is based on Differentiated Services (Diffserv) architecture and
   various references have been made to already available standard
   architecture documents.

   Diffserv is a preferred approach for network service providers to
   offer services to different customers based on their different kinds
   of network quality-of-service (QoS) objectives.  The traffic streams
   are differentiated based on Differentiated Services 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.  Diffserv Model Design

   Diffserv architecture [RFC3289] [RFC2475] describes network node
   packet classification function and packet conditioning functions.

   The complex classification is done at the edge of network and non-
   edge network devices conditions appropriately marked aggregate
   traffic based on per-hop behavior rules.  Accordingly, a Multi-Field
   classifier matches the different fields in a packet and a Behavior
   Aggregated Classifier matches on DS codepoint field of a packet.

   Packets MAY be grouped when a logical set of rules are applied on
   different packet header fields.  Also, packet grouping MAY be done
   based on different values or range of values of same packet header
   field.  Packet grouping MAY also be done based on presence of some
   values or range of values of a packet field or absence of such values
   or ranges.  This diffserv model is flexible enough to support such
   logical grouping of packets.

   A classifier entry can be stored as an object and used across
   different interfaces for either of inbound or outbound traffic.  Any
   modification or deletion of such object will in turn results in such
   changes to the classifier on the corresponding interfaces.  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 such
   classifier entries with corresponding conditioning functions when
   arranged in order of priority represents a diffserv policy.  A
   diffserv policy MAY contain one or more classifier entries.  Actions
   are configured as inline as compared of classifier entry which can be
   stored as object or configured inline in a diffserv policy.  This is
   mainly because actions generally contain more specific parameters
   like meter rate, or RED threshold.  Any new classifier entry in a
   policy MAY be inserted before or after any other existing classifier-
   entry [RFC6020].  Such policies is stored as an object and used
   across different network device interfaces.

   A meter qualifies if the traffic arrival rate is based on agreed upon
   rate and variability.  A meter is generically modeled as qualifying
   rate and variability defined as a token bucket.  Single rate meter
   [RFC2697] can be defined as two such token buckets with first
   defining the rate and committed burst and excess burst for second



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   bucket.  Similarly, two rates meter [RFC2698][RFC2859] can be defined
   as two such token buckets with first and second defining the
   committed rate and committed burst parameters and peak rate and peak
   burst respectively.  Different Vendors can extend it to have other
   types of meters as well.

   Metered traffic to each token bucket MAY either be marked or remarked
   appropriately of the diffserv codepoint packet field or even MAY be
   dropped.  Classified packets through a classifier entry MAY directly
   be marked.

   Packets can be always dropped if exceed agreed upon rates or it could
   be queued and then dropped based on any of various algorithms.  Queue
   dropping is based on the threshold configured and can head-drop,
   tail-drop or dropped based on Active Queue Management algorithm like
   Random Early Detection (RED).  Packets can be scheduled out based on
   priority with minimum-rate or WFQ with bandwidth sharing.  Priority
   scheduler allow queue to use the entire capacity of the interface
   unless higher priority traffic is queued to be scheduled.  If
   combination of EF [RFC3246] and multiple AF [RFC3260] classes of
   traffic needs to be scheduled, a combination of priority and WFQ
   scheduler SHOULD be used.  Traffic can be shaped by defining a max
   rate and burst for a leaky bucket profile.

4.  Diffserv Model

   The model have four YANG modules. ietf-diffserv-classifier consists
   of classifier entries identified by a classifier entry name.  Each
   such entry contains list of filter entries.  When no filter entry is
   present in a classifier entry, it matches all traffic.  Each filter
   entry represent any of the filter type [RFC6991] of a multi-field
   classifier which can be logically AND/OR with other filter types in
   the same classifier-entry.  The model is flexible enough to take
   multiple values of the same filter type.

















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   module: ietf-diffserv-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
               +--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


   An ietf-diffserv-policy module contains list of policy objects
   identified by a policy name which MUST be provided.  Each policy
   object contains list of classifier-entries either configured inline
   or referred as an object.  Each such classifier entry is augmented by
   set of actions.  A policy object MAY contain a child-policy in each
   classifier-entry.  A child policy MAY further classify the traffic
   and execute actions on classified packets.


   module: ietf-diffserv-policy
     +--rw policies



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        +--rw policy-entry* [policy-name]
           +--rw policy-name         string
           +--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 (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
              +--rw classifier-action-entry-cfg* [action-type]
              |  +--rw action-type                 identityref
              |  +--rw (action-cfg-params)?
              |     +--:(marking)
              |     |  +--rw action:marking-cfg
              |     |     +--rw action:dscp?   inet:dscp
              |     +--:(priority)
              |     |  +--rw action:priority-cfg
              |     |     +--rw action:priority-level?   uint8
              |     +--:(meter)
              |     |  +--rw action:meter-cfg



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              |     |     +--rw action:meter-list* [meter-id]
              |     |        +--rw action:meter-id          uint16
              |     |        +--rw action:meter-rate?       uint64
              |     |        +--rw (burst-type)?
              |     |        |  +--:(size)
              |     |        |  |  +--rw action:burst-size?       uint64
              |     |        |  +--:(interval)
              |     |        |     +--rw action:burst-interval?   uint64
              |     |        +--rw action:color
              |     |        |  +--rw action:classifier-entry-name?
                                     string
              |     |        |  +--rw action:classifier-entry-descr?
                                     string
              |     |        |  +--rw action:
                                     classifier-entry-filter-operation?
                                     identityref
              |     |        +--rw action:succeed-action
              |     |        |  +--rw action:meter-action-type?
                                     identityref
              |     |        |  +--rw action:next-meter-id?     uint16
              |     |        |  +--rw (val)?
              |     |        |     +--:(meter-action-mark)
              |     |        |     |  +--rw action:dscp?  inet:dscp
              |     |        |     +--:(meter-action-drop)
              |     |        |        +--rw action:drop-action? empty
              |     |        +--rw action:fail-action
              |     |           +--rw action:meter-action-type?
                                     identityref
              |     |           +--rw action:next-meter-id?     uint16
              |     |           +--rw (val)?
              |     |              +--:(meter-action-mark)
              |     |              |  +--rw action:dscp?   inet:dscp
              |     |              +--:(meter-action-drop)
              |     |                 +--rw action:drop-action? empty
              |     +--:(min-rate)
              |     |  +--rw action:min-rate-cfg
              |     |     +--rw action:min-rate?   uint64
              |     +--:(max-rate)
              |     |  +--rw action:max-rate-cfg
              |     |     +--rw action:absolute-rate?    uint64
              |     |     +--rw (burst-type)?
              |     |        +--:(size)
              |     |        |  +--rw action:burst-size?  uint64
              |     |        +--:(interval)
              |     |           +--rw action:burst-interval? uint64
              |     +--:(algorithmic-drop)
              |        +--rw (drop-algorithm)?
              |           +--:(always-drop)



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              |           |  +--rw action:drop-cfg
              |           |     +--rw action:drop-action?   empty
              |           +--:(tail-drop)
              |           |  +--rw action:tail-drop-cfg
              |           |     +--rw action:qlimit-dscp-thresh*
                                     [dscp-min dscp-max]
              |           |        +--rw action:dscp-min     inet:dscp
              |           |        +--rw action:dscp-max     inet:dscp
              |           |        +--rw action:threshold
              |           |           +--rw (threshold-type)?
              |           |              +--:(size)
              |           |              |  +--rw action:threshold-size?
                                                 uint64
              |           |              +--:(interval)
              |           |                 +--rw action:
                                                 threshold-interval?
                                                 uint64
              |           +--:(random-detect)
              |              +--rw action:random-detect-cfg
                                  {aqm-red-support}?
              |                 +--rw action:exp-weighting-const? uint32
              |                 +--rw action:red-min-thresh
              |                 |  +--rw action:threshold
              |                 |     +--rw (threshold-type)?
              |                 |        +--:(size)
              |                 |        |  +--rw action:threshold-size?
                                                 uint64
              |                 |        +--:(interval)
              |                 |           +--rw action:
                                                 threshold-interval?
                                                 uint64
              |                 +--rw action:red-max-thresh
              |                 |  +--rw action:threshold
              |                 |     +--rw (threshold-type)?
              |                 |        +--:(size)
              |                 |        |  +--rw action:threshold-size?
                                                 uint64
              |                 |        +--:(interval)
              |                 |           +--rw action:
                                                 threshold-interval?
                                                 uint64
              |                 +--rw action:mark-probability?  uint32
              +--rw child-policy?  leafref {hierarchial-policy-support}?


   ietf-diffserv-action module contains set of diffserv actions which
   are augmented to ietf-diffserv-policy module and to ietf-diffserv-
   target module.  Marking sets Diffserv codepoint value in the



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   classified packet.  Color-aware and Color-blind meters can be
   configured.  Action counters are defined as grouping and are
   currently not augmented to any diffserv module.

   ietf-diffserv-target module contains reference of diffserv-policy for
   either direction of network traffic and is augmented to ietf-
   interfaces [RFC7223] module.


   module: ietf-diffserv-target
   augment /if:interfaces/if:interface:
      +--rw diffserv-target-entry* [direction policy-name]
         +--rw direction                                identityref
         +--rw policy-name                              string
         +--ro diffserv-target-classifier-statistics*
              [classifier-entry-name parent-path]
            +--ro classifier-entry-name          string
            +--ro parent-path                    string
            +--ro classifier-entry-statistics
            |  +--ro classified-pkts?    uint64
            |  +--ro classified-bytes?   uint64
            |  +--ro classified-rate?    uint64
            +--ro meter-statistics* [meter-id]
            |  +--ro meter-id               uint16
            |  +--ro meter-succeed-pkts?    uint64
            |  +--ro meter-succeed-bytes?   uint64
            |  +--ro meter-failed-pkts?     uint64
            |  +--ro meter-failed-bytes?    uint64
            +--ro queuing-statistics
               +--ro output-pkts?        uint64
               +--ro output-bytes?       uint64
               +--ro queue-size-pkts?    uint64
               +--ro queue-size-bytes?   uint64
               +--ro drop-pkts?          uint64
               +--ro drop-bytes?         uint64
               +--ro red-stats
                  +--ro early-drop-pkts?    uint64
                  +--ro early-drop-bytes?   uint64


5.  Diffserv Modules

5.1.  IETF-DIFFSERV-CLASSIFIER


   <CODE BEGINS>file "ietf-diffserv-classifier@2015-04-07.yang"
   module ietf-diffserv-classifier {
     yang-version 1;



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     namespace "urn:ietf:params:xml:ns:yang:ietf-diffserv-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: Tom Nadeau
                  <mailto:tnadeau@lucidvision.com>

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

        Editor:   Shitanshu Shah
                  <mailto:svshah@cisco.com>";
     description
       "This module contains a collection of YANG definitions for
        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 2015-04-07 {
       description
         "Latest revision of diffserv based classifier";
       reference "RFC XXXX";
     }

     feature policy-inline-classifier-config {
       description



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         " 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
         "DSCP filter-type";
     }

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

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

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

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

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

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



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     }

     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 filters {
       description
         "Filters 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
           ";
       }
       choice filter-param {
         description
           "Choice of filter types";
         case dscp {
           list dscp-cfg {
             key "dscp-min dscp-max";
             description
               "list of dscp ranges";
             leaf dscp-min {
               type inet:dscp;
               description
                 "Minimum value of dscp range";
             }
             leaf dscp-max {
               type inet:dscp;



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               description
                 "maximum value of dscp range";
             }
           }
           description
             "Filter containing list of dscp ranges";
         }
         case source-ip-address {
           list source-ip-address-cfg {
             key "source-ip-addr";
             description
               "list of source ip address";
             leaf source-ip-addr {
               type inet:ip-prefix;
               description
                 "source ip prefix";
             }
           }
           description
             "Filter containing list of source ip addresses";
         }
         case destination-ip-address {
           list destination-ip-address-cfg {
             key "destination-ip-addr";
             description
               "list of destination ip address";
             leaf destination-ip-addr {
               type inet:ip-prefix;
               description
                 "destination ip prefix";
             }
           }
           description
             "Filter containing list of destination ip address";
         }
         case source-port {
           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



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                 "maximum value of source port range";
             }
           }
           description
             "Filter containing list of source-port ranges";
         }
         case destination-port {
           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 containing list of destination-port ranges";
         }
         case protocol {
           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 Type Protocol";
         }



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       }
     }

     grouping classifier-entry-generic-attr {
       description
         "Classifier attributes";
       leaf classifier-entry-name {
         type string;
         description
           "Diffserv classifier name";
       }
       leaf classifier-entry-descr {
         type string;
         description
           "Description of the class template";
       }
       leaf classifier-entry-filter-operation {
         type identityref {
           base classifier-entry-filter-operation-type;
         }
         default "match-any-filter";
         description
           "Filters are applicable as any or all filters";
       }
     }

     grouping classifier-entry-inline-attr {
       description
         "Classifier inline attributes";
       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-any-filter";
         description
           "Filters are applicable as any or all filters";
       }
       list filter-entry {
         if-feature policy-inline-classifier-config;
         must "classifier-entry-inline == true" {
           description
             "For inline filter configuration, inline attribute



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              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
           "classifier entry template";
         uses classifier-entry-generic-attr;
         list filter-entry {
           key "filter-type filter-logical-not";
           uses filters;
           description
             "Filter configuration";
         }
       }
     }
   }
   <CODE ENDS>


5.2.  IETF-DIFFSERV-POLICY


   <CODE BEGINS>file "ietf-diffserv-policy@2015-04-07.yang"
   module ietf-diffserv-policy {
     yang-version 1;
     namespace "urn:ietf:params:xml:ns:yang:ietf-diffserv-policy";
     prefix policy;

     import ietf-diffserv-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



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                  <mailto:j.schoenwaelder@jacobs-university.de>

        WG Chair: Tom Nadeau
                  <mailto:tnadeau@lucidvision.com>

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

        Editor:   Shitanshu Shah
                  <mailto:svshah@cisco.com>";
     description
       "This module contains a collection of YANG definitions for
        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 2015-04-07 {
       description
         "Latest revision of diffserv policy";
       reference "RFC XXXX";
     }

     feature hierarchial-policy-support {
       description
         " This feature allows hierarchial policy to be configured";
     }

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



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         description
           "Diffserv 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
           "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";
         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



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               "Diffserv classifier entry name";
           }
           uses classifier:classifier-entry-inline-attr;
           uses classifier-action-entry-cfg;
           leaf child-policy {
             if-feature hierarchial-policy-support;
             type leafref {
               path "/policies/policy-entry/policy-name";
             }
             description
               "Child Policy in the hierarchial configuration";
           }
         }
       }
     }
   }
   <CODE ENDS>


5.3.  IETF-DIFFSERV-ACTION


   <CODE BEGINS>file "ietf-diffserv-action@2015-04-07.yang"
   module ietf-diffserv-action {
     namespace "urn:ietf:params:xml:ns:yang:ietf-diffserv-action";
     prefix action;

     import ietf-inet-types {
       prefix inet;
     }
     import ietf-diffserv-classifier {
       prefix classifier;
     }
     import ietf-diffserv-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: Tom Nadeau
                  <mailto:tnadeau@lucidvision.com>




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

        Editor:   Shitanshu Shah
                  <mailto:svshah@cisco.com>";
     description
       "This module contains a collection of YANG definitions for
        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 2015-04-07 {
       description
         "Latest revision for diffserv actions";
       reference "RFC XXXX";
     }

     feature hierarchial-policy-support {
       description
         " This feature allows hierarchial policy to be configured";
     }

     feature aqm-red-support {
       description
         " This feature allows AQM RED to be configured";
     }

     grouping dscp-range {
       description
         "dscp range definition";
       leaf dscp-min {
         type inet:dscp;
         description
           "Minimum of dscp range";
       }
       leaf dscp-max {
         type inet:dscp;



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         description
           "Maximum of dscp range";
       }
     }

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



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               units "microsecond";
               description
                 "Threshold interval";
             }
           }
           description
             "Choice of threshold type";
         }
       }
     }

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

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

     identity priority {
       base policy:action-type;
       description
         "priority action 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 algorithmic-drop {
       base policy:action-type;
       description
         "algorithmic-drop action type";
     }

     identity drop-type {



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       description
         "drop algorithm";
     }

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

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

     identity random-detect {
       base drop-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-set {
       base meter-action-type;
       description
         "mark action type in a meter";
     }

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



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     grouping queuelimit {
       list qlimit-dscp-thresh {
         key "dscp-min dscp-max";
         uses dscp-range;
         uses threshold;
         description
           "the queue limit per dscp range";
       }
       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";
       }
       leaf next-meter-id {
         type uint16;
         description
           "next meter identifier";
       }
       choice val {
         case meter-action-mark {
           uses 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";
     }

     grouping meter {
       leaf meter-id {
         type uint16;
         description
           "meter identifier";



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       }
       leaf meter-rate {
         type uint64;
         units "bits-per-second";
         description
           "meter rate";
       }
       uses burst;
       container color {
         uses classifier:classifier-entry-generic-attr;
         description
           "color aware & color blind attributes container";
       }
       container succeed-action {
         uses meter-action-params;
         description
           "confirm action";
       }
       container fail-action {
         uses meter-action-params;
         description
           "exceed action";
       }
       description
         "meter attributes";
     }

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

     grouping min-rate {
       leaf min-rate {
         type uint64;
         units "bits-per-second";
         description
           "minimum rate";
       }
       description
         "minimum rate grouping";
     }




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

     grouping max-rate {
       leaf absolute-rate {
         type uint64;
         units "bits-per-second";
         description
           "rate in bits per second";
       }
       uses burst;
       description
         "maximum rate attributes";
     }

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

     grouping randomdetect {
       leaf exp-weighting-const {
         type uint32;
         description



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           "Exponential weighting constant factor for red profile ";
       }
       uses red-threshold;
       description
         "Random detect attributes";
     }

     augment "/policy:policies/policy:policy-entry" +
             "/policy:classifier-entry" +
             "/policy:classifier-action-entry-cfg" +
             "/policy:action-cfg-params" {
       case marking {
         container marking-cfg {
           uses marking;
           description
             "Marking configuration container";
         }
       }
       case priority {
         container priority-cfg {
           uses priority;
           description
             "priority attributes container";
         }
       }
       case meter {
         container meter-cfg {
           list meter-list {
             key "meter-id";
             uses meter;
             description
               "Meter configuration";
           }
           description
             "Meter list configuration container";
         }
       }
       case min-rate {
         container min-rate-cfg {
           uses min-rate;
           description
             "min guaranteed bandwidth";
         }
       }
       case max-rate {
         container max-rate-cfg {
           uses max-rate;
           description



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             "maximum rate attributes";
         }
       }
       case algorithmic-drop {
         choice drop-algorithm {
           case always-drop {
             container drop-cfg {
               uses drop;
               description
                 "Always Drop configuration container";
             }
           }
           case tail-drop {
             container tail-drop-cfg {
               uses queuelimit;
               description
                 "Tail Drop configuration container";
             }
           }
           case random-detect {
             container random-detect-cfg {
               if-feature aqm-red-support;
               uses randomdetect;
               description
                 "Random Detect configuration container";
             }
           }
           description
             "Choice of Drop Algorithm";
         }
       }
       description
         "Augment the actions to policy entry";
     }
   }
   <CODE ENDS>


5.4.  IETF-DIFFSERV-TARGET


   <CODE BEGINS>file "ietf-diffserv-target@2015-04-07.yang"
   module ietf-diffserv-target {
     yang-version 1;
     namespace "urn:ietf:params:xml:ns:yang:ietf-diffserv-target";
     prefix target;

     import ietf-interfaces {



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       prefix if;
     }

     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: Tom Nadeau
                  <mailto:tnadeau@lucidvision.com>

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

        Editor:   Shitanshu Shah
                  <mailto:svshah@cisco.com>";
     description
       "This module contains a collection of YANG definitions for
        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 2015-04-07 {
       description
         "Latest revision diffserv based policy applied to a target";
       reference "RFC XXXX";
     }

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

     identity inbound {



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       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";
     }

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

     grouping red-stats {
       description
         "RED 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";



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         }
         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
             " 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 ";
         }



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         leaf drop-bytes {
           type uint64;
           description
             "Total number of bytes dropped ";
         }
         container red-stats {
           uses red-stats;
           description
             "Container for RED statistics";
         }
       }
     }

     grouping meter-stats {
       description
         "Metering Counters";
       list meter-statistics {
         key "meter-id";
         description
           "Meter statistics";
         leaf meter-id {
           type uint16;
           description
             "Meter Identifier";
         }
         leaf meter-succeed-pkts {
           type uint64;
           description
             "Number of packets which succeed the meter";
         }
         leaf meter-succeed-bytes {
           type uint64;
           description
             "Bytes of packets which succeed the meter";
         }
         leaf meter-failed-pkts {
           type uint64;
           description
             "Number of packets which failed the meter";
         }
         leaf meter-failed-bytes {
           type uint64;
           description
             "Bytes of packets which failed the meter";
         }
       }
     }




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     augment "/if:interfaces/if:interface" {
       description
         "Augments Diffserv Target Entry to Interface module";
       list diffserv-target-entry {
         key "direction policy-name";
         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-name {
           type string;
           description
             "Policy entry name";
         }
         list diffserv-target-classifier-statistics {
           key "classifier-entry-name parent-path";
           config false;
           description
             "Statistics for each Classifier Entry in a Policy";
           leaf classifier-entry-name {
             type string;
             description
               "Classifier Entry Name";
           }
           leaf parent-path {
             type string;
             description
               "Path of the Classifier Entry in a hierarchial policy ";
           }
           uses classifier-entry-stats;
           uses meter-stats;
           uses queuing-stats;
         }
       }
     }
   }
   <CODE ENDS>









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6.  Security Considerations

7.  Acknowledgement

   The editor 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.

8.  References

8.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2697]  Heinanen, J. and R. Guerin, "A Single Rate Three Color
              Marker", RFC 2697, September 1999.

   [RFC2698]  Heinanen, J. and R. Guerin, "A Two Rate Three Color
              Marker", RFC 2698, September 1999.

   [RFC2859]  Fang, W., Seddigh, N., and B. Nandy, "A Time Sliding
              Window Three Colour Marker (TSWTCM)", RFC 2859, June 2000.

   [RFC3246]  Davie, B., Charny, A., Bennet, J., Benson, K., Le Boudec,
              J., Courtney, W., Davari, S., Firoiu, V., and D.
              Stiliadis, "An Expedited Forwarding PHB (Per-Hop
              Behavior)", RFC 3246, March 2002.

   [RFC3260]  Grossman, D., "New Terminology and Clarifications for
              Diffserv", RFC 3260, April 2002.

   [RFC3289]  Baker, F., Chan, K., and A. Smith, "Management Information
              Base for the Differentiated Services Architecture", RFC
              3289, May 2002.

   [RFC6020]  Bjorklund, M., "YANG - A Data Modeling Language for the
              Network Configuration Protocol (NETCONF)", RFC 6020,
              October 2010.

   [RFC6991]  Schoenwaelder, J., "Common YANG Data Types", RFC 6991,
              July 2013.

   [RFC7223]  Bjorklund, M., "A YANG Data Model for Interface
              Management", RFC 7223, May 2014.





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8.2.  Informative References

   [RFC2475]  Blake, S., Black, D., Carlson, M., Davies, E., Wang, Z.,
              and W. Weiss, "An Architecture for Differentiated
              Services", RFC 2475, December 1998.

Appendix A.  Open Items

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

Authors' Addresses

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

   Email: asechoud@cisco.com


   Shitanshu Shah
   Cisco Systems
   170 W. Tasman Drive
   San Jose, CA  95134
   US

   Email: svshah@cisco.com


   Mahesh Jethanandani
   Ciena Corporation
   3939 North 1st Street
   San Jose, CA  95134
   US

   Email: mjethanandani@gmail.com











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Internet-Draft           YANG Model For Diffserv               June 2015


   Gang Yan
   Huawei Technologies
   Huawei Bld., No. 156 Beiqing Rd
   Beijing  100095
   China

   Email: yangang@huawei.com


   Bing Liu
   Huawei Technologies
   Q14, Huawei Campus, No.156 Beiqing Rd
   Beijing  100095
   China

   Email: Leo.liubing@huawei.com


   Norm Strahle
   Juniper Networks
   1194 North Mathilda Avenue
   Sunnyvale, CA  94089
   US

   Email: nstrahle@juniper.net


























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