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rfc:rfc8194

Internet Engineering Task Force (IETF) J. Schoenwaelder Request for Comments: 8194 Jacobs University Bremen Category: Standards Track V. Bajpai ISSN: 2070-1721 Technical University of Munich

                                                           August 2017
           A YANG Data Model for LMAP Measurement Agents

Abstract

 This document defines a data model for Large-Scale Measurement
 Platforms (LMAPs).  The data model is defined using the YANG data
 modeling language.

Status of This Memo

 This is an Internet Standards Track document.
 This document is a product of the Internet Engineering Task Force
 (IETF).  It represents the consensus of the IETF community.  It has
 received public review and has been approved for publication by the
 Internet Engineering Steering Group (IESG).  Further information on
 Internet Standards is available in Section 2 of RFC 7841.
 Information about the current status of this document, any errata,
 and how to provide feedback on it may be obtained at
 http://www.rfc-editor.org/info/rfc8194.

Copyright Notice

 Copyright (c) 2017 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
 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.

Schoenwaelder & Bajpai Standards Track [Page 1] RFC 8194 YANG Data Model for LMAP August 2017

Table of Contents

 1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   2
   1.2.  Tree Diagrams . . . . . . . . . . . . . . . . . . . . . .   2
 2.  Data Model Overview . . . . . . . . . . . . . . . . . . . . .   3
 3.  Relationship to the Information Model . . . . . . . . . . . .   9
 4.  YANG Modules  . . . . . . . . . . . . . . . . . . . . . . . .  10
   4.1.  LMAP Common YANG Module . . . . . . . . . . . . . . . . .  10
   4.2.  LMAP Control YANG Module  . . . . . . . . . . . . . . . .  18
   4.3.  LMAP Report YANG Module . . . . . . . . . . . . . . . . .  40
 5.  Security Considerations . . . . . . . . . . . . . . . . . . .  45
 6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  47
 7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  48
   7.1.  Normative References  . . . . . . . . . . . . . . . . . .  48
   7.2.  Informative References  . . . . . . . . . . . . . . . . .  49
 Appendix A.  Example Parameter Extension Module . . . . . . . . .  51
 Appendix B.  Example Configuration  . . . . . . . . . . . . . . .  53
 Appendix C.  Example Report . . . . . . . . . . . . . . . . . . .  56
 Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  59
 Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  59

1. Introduction

 This document defines a data model for Large-Scale Measurement
 Platforms (LMAPs) [RFC7594].  The data model is defined using the
 YANG [RFC7950] data modeling language.  It is based on the LMAP
 Information Model [RFC8193].

1.1. Terminology

 This document uses the LMAP terminology defined in [RFC7594].
 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
 "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
 "OPTIONAL" in this document are to be interpreted as described in BCP
 14 [RFC2119] [RFC8174] when, and only when, they appear in all
 capitals, as shown here.

1.2. Tree Diagrams

 A simplified graphical representation of the data model is used in
 this document.  The meaning of the symbols in these diagrams is as
 follows:
 o  Brackets "[" and "]" enclose list keys.

Schoenwaelder & Bajpai Standards Track [Page 2] RFC 8194 YANG Data Model for LMAP August 2017

 o  Abbreviations before data node names: "rw" means configuration
    (read-write), "ro" means state data (read-only), and "w" means RPC
    input data (write-only).
 o  Symbols after data node names: "?" means an optional node, "!"
    means a presence container, and "*" denotes a list and leaf-list.
 o  Parentheses enclose choice and case nodes, and case nodes are also
    marked with a colon (":").
 o  Ellipsis ("...") stands for contents of subtrees that are not
    shown.

2. Data Model Overview

 The LMAP framework has three basic elements: Measurement Agents
 (MAs), Controllers, and Collectors.  Measurement Agents initiate the
 actual measurements, which are called Measurement Tasks in the LMAP
 terminology.  The Controller instructs one or more MAs and
 communicates the set of Measurement Tasks an MA should perform and
 when.  The Collector accepts Reports from the MAs with the Results
 from their Measurement Tasks.
 The YANG data model for LMAP has been split into three modules:
 1.  The module ietf-lmap-common.yang provides common definitions such
     as LMAP-specific data types.
 2.  The module ietf-lmap-control.yang defines the data structures
     exchanged between a Controller and Measurement Agents.
 3.  The module ietf-lmap-report.yang defines the data structures
     exchanged between Measurement Agents and Collectors.
 As shown in Figure 1, a Controller, implementing
 ietf-lmap-common.yang and ietf-lmap-control.yang as a client, will
 instruct Measurement Agents, which implement ietf-lmap-common.yang
 and ietf-lmap-control.yang as servers.  A Measurement Agent,
 implementing ietf-lmap-common.yang and ietf-lmap-report.yang, will
 send results to a Collector, which implements ietf-lmap-common.yang
 and ietf-lmap-report.yang as a server.

Schoenwaelder & Bajpai Standards Track [Page 3] RFC 8194 YANG Data Model for LMAP August 2017

                                       +------------------------+
                                       | LMAP Controller        |
                                       |                        |
                                       | Client:                |
                                       | ietf-lmap-common.yang  |
                                       | ietf-lmap-control.yang |
                                       +------------------------+
   +------------------------+                      |
   | LMAP Measurement Agent |                      |
   |                        |     <- request       |
   | Server:                |<---------------------'
   | ietf-lmap-common.yang  |     response ->
   | ietf-lmap-control.yang |
   |                        |
   |                        |     request ->
   | Client:                |----------------------.
   | ietf-lmap-common.yang  |     <- response      |
   | ietf-lmap-report.yang  |                      |
   +------------------------+                      v
                                       +------------------------+
                                       | LMAP Collector         |
                                       |                        |
                                       | Server:                |
                                       | ietf-lmap-common.yang  |
                                       | ietf-lmap-report.yang  |
                                       +------------------------+
  Figure 1: The LMAP Controller, Measurement Agent, and Collector and
          the YANG Modules They Implement as Client or Server

Schoenwaelder & Bajpai Standards Track [Page 4] RFC 8194 YANG Data Model for LMAP August 2017

 The tree diagram below shows the structure of the control data model.

module: ietf-lmap-control

  +--rw lmap
     +--ro capabilities
     |  +--ro version    string
     |  +--ro tag*       lmap:tag
     |  +--ro tasks
     |     +--ro task* [name]
     |        +--ro name        lmap:identifier
     |        +--ro function* [uri]
     |        |  +--ro uri     inet:uri
     |        |  +--ro role*   string
     |        +--ro version?    string
     |        +--ro program?    string
     +--rw agent
     |  +--rw agent-id?                   yang:uuid
     |  +--rw group-id?                   string
     |  +--rw measurement-point?          string
     |  +--rw report-agent-id?            boolean
     |  +--rw report-group-id?            boolean
     |  +--rw report-measurement-point?   boolean
     |  +--rw controller-timeout?         uint32
     |  +--ro last-started                yang:date-and-time
     +--rw tasks
     |  +--rw task* [name]
     |     +--rw name        lmap:identifier
     |     +--rw function* [uri]
     |     |  +--rw uri     inet:uri
     |     |  +--rw role*   string
     |     +--rw program?    string
     |     +--rw option* [id]
     |     |  +--rw id       lmap:identifier
     |     |  +--rw name?    string
     |     |  +--rw value?   string
     |     +--rw tag*        lmap:identifier

Schoenwaelder & Bajpai Standards Track [Page 5] RFC 8194 YANG Data Model for LMAP August 2017

     +--rw schedules
     |  +--rw schedule* [name]
     |     +--rw name               lmap:identifier
     |     +--rw start              event-ref
     |     +--rw (stop)?
     |     |  +--:(end)
     |     |  |  +--rw end?               event-ref
     |     |  +--:(duration)
     |     |     +--rw duration?          uint32
     |     +--rw execution-mode?    enumeration
     |     +--rw tag*               lmap:tag
     |     +--rw suppression-tag*   lmap:tag
     |     +--ro state              enumeration
     |     +--ro storage            yang:gauge64
     |     +--ro invocations        yang:counter32
     |     +--ro suppressions       yang:counter32
     |     +--ro overlaps           yang:counter32
     |     +--ro failures           yang:counter32
     |     +--ro last-invocation?   yang:date-and-time
     |     +--rw action* [name]
     |        +--rw name                      lmap:identifier
     |        +--rw task                      task-ref
     |        +--rw parameters
     |        |  +--rw (extension)?
     |        +--rw option* [id]
     |        |  +--rw id       lmap:identifier
     |        |  +--rw name?    string
     |        |  +--rw value?   string
     |        +--rw destination*              schedule-ref
     |        +--rw tag*                      lmap:tag
     |        +--rw suppression-tag*          lmap:tag
     |        +--ro state                     enumeration
     |        +--ro storage                   yang:gauge64
     |        +--ro invocations               yang:counter32
     |        +--ro suppressions              yang:counter32
     |        +--ro overlaps                  yang:counter32
     |        +--ro failures                  yang:counter32
     |        +--ro last-invocation           yang:date-and-time
     |        +--ro last-completion           yang:date-and-time
     |        +--ro last-status               lmap:status-code
     |        +--ro last-message              string
     |        +--ro last-failed-completion    yang:date-and-time
     |        +--ro last-failed-status        lmap:status-code
     |        +--ro last-failed-message       string

Schoenwaelder & Bajpai Standards Track [Page 6] RFC 8194 YANG Data Model for LMAP August 2017

     +--rw suppressions
     |  +--rw suppression* [name]
     |     +--rw name            lmap:identifier
     |     +--rw start?          event-ref
     |     +--rw end?            event-ref
     |     +--rw match*          lmap:glob-pattern
     |     +--rw stop-running?   boolean
     |     +--ro state           enumeration
     +--rw events
        +--rw event* [name]
           +--rw name                    lmap:identifier
           +--rw random-spread?          uint32
           +--rw cycle-interval?         uint32
           +--rw (event-type)?
              +--:(periodic)
              |  +--rw periodic
              |     +--rw interval    uint32
              |     +--rw start?      yang:date-and-time
              |     +--rw end?        yang:date-and-time
              +--:(calendar)
              |  +--rw calendar
              |     +--rw month*             lmap:month-or-all
              |     +--rw day-of-month*      lmap:day-of-months-or-all
              |     +--rw day-of-week*       lmap:weekday-or-all
              |     +--rw hour*              lmap:hour-or-all
              |     +--rw minute*            lmap:minute-or-all
              |     +--rw second*            lmap:second-or-all
              |     +--rw timezone-offset?   lmap:timezone-offset
              |     +--rw start?             yang:date-and-time
              |     +--rw end?               yang:date-and-time
              +--:(one-off)
              |  +--rw one-off
              |     +--rw time    yang:date-and-time
              +--:(immediate)
              |  +--rw immediate               empty
              +--:(startup)
              |  +--rw startup                 empty
              +--:(controller-lost)
              |  +--rw controller-lost         empty
              +--:(controller-connected)
                 +--rw controller-connected    empty

Schoenwaelder & Bajpai Standards Track [Page 7] RFC 8194 YANG Data Model for LMAP August 2017

 The tree diagram below shows the structure of the reporting data
 model.
 module: ietf-lmap-report
   rpcs:
     +---x report
        +---w input
           +---w date                 yang:date-and-time
           +---w agent-id?            yang:uuid
           +---w group-id?            string
           +---w measurement-point?   string
           +---w result*
              +---w schedule?       lmap:identifier
              +---w action?         lmap:identifier
              +---w task?           lmap:identifier
              +---w parameters
              |  +---w (extension)?
              +---w option* [id]
              |  +---w id       lmap:identifier
              |  +---w name?    string
              |  +---w value?   string
              +---w tag*            lmap:tag
              +---w event?          yang:date-and-time
              +---w start           yang:date-and-time
              +---w end?            yang:date-and-time
              +---w cycle-number?   lmap:cycle-number
              +---w status          lmap:status-code
              +---w conflict*
              |  +---w schedule-name?   lmap:identifier
              |  +---w action-name?     lmap:identifier
              |  +---w task-name?       lmap:identifier
              +---w table*
                 +---w function* [uri]
                 |  +---w uri     inet:uri
                 |  +---w role*   string
                 +---w column*     string
                 +---w row*
                    +---w value*   string

Schoenwaelder & Bajpai Standards Track [Page 8] RFC 8194 YANG Data Model for LMAP August 2017

3. Relationship to the Information Model

 The LMAP Information Model [RFC8193] is divided into six aspects.
 They are mapped into the YANG data model as explained below:
 o  Preconfiguration Information: This is not modeled explicitly since
    bootstrapping information is outside the scope of this data model.
    Implementations may use some of the Configuration Information also
    for bootstrapping purposes.
 o  Configuration Information: This is modeled in the /lmap/agent
    subtree, the /lmap/schedules subtree, and the /lmap/tasks subtree
    described below.  Some items have been left out because they are
    expected to be dealt with by the underlying protocol.
 o  Instruction Information: This is modeled in the /lmap/suppressions
    subtree, the /lmap/schedules subtree, and the /lmap/tasks subtree
    described below.
 o  Logging Information: Some of the Logging Information, in
    particular 'success/failure/warning messages in response to
    information updates from the Controller', will be handled by the
    protocol used to manipulate the LMAP-specific configuration.  The
    LMAP data model defined in this document assumes that runtime
    Logging Information will be communicated using protocols that do
    not require a formal data model, e.g., the syslog protocol defined
    in [RFC5424].
 o  Capability and Status Information: Some of the Capability and
    Status Information is modeled in the /lmap/capability subtree.
    The list of supported Tasks is modeled in the /lmap/capabilities/
    task list.  Status Information about Schedules and Actions is
    included in the /lmap/schedules subtree.  Information about
    network interfaces can be obtained from the ietf-interfaces YANG
    data model [RFC7223].  Information about the hardware and the
    firmware can be obtained from the ietf-system YANG data model
    [RFC7317].  A device identifier can be obtained from the ietf-
    hardware YANG data model [YANG-HARDWARE].
 o  Reporting Information: This is modeled by the report data model to
    be implemented by the Collector.  Measurement Agents send results
    to the Collector by invoking an RPC on the Collector.
 These six Information Model aspects use a collection of common
 information objects.  These common information objects are
 represented in the YANG data model as follows:
 o  Schedules: Schedules are modeled in the /lmap/schedules subtree.

Schoenwaelder & Bajpai Standards Track [Page 9] RFC 8194 YANG Data Model for LMAP August 2017

 o  Channels: Channels are not modeled since the NETCONF server
    configuration data model [NETCONF-CLIENT-SERVER] already provides
    a mechanism to configure NETCONF server Channels.
 o  Task Configurations: Configured Tasks are modeled in the /lmap/
    tasks subtree.
 o  Event Information: Event definitions are modeled in the /lmap/
    events subtree.

4. YANG Modules

4.1. LMAP Common YANG Module

 This module imports definitions from [RFC6536], and it references
 [ISO-8601].
 <CODE BEGINS> file "ietf-lmap-common@2017-08-08.yang"
 module ietf-lmap-common {
   yang-version 1.1;
   namespace "urn:ietf:params:xml:ns:yang:ietf-lmap-common";
   prefix "lmap";
   import ietf-inet-types {
     prefix inet;
   }
   organization
     "IETF Large-Scale Measurement of Broadband Performance
      Working Group";
   contact
     "WG Web:   <https://datatracker.ietf.org/wg/lmap>
      WG List:  <mailto:lmap@ietf.org>
      Editor:   Juergen Schoenwaelder
                <j.schoenwaelder@jacobs-university.de>
      Editor:   Vaibhav Bajpai
                <bajpaiv@in.tum.de>";
   description
     "This module provides common definitions used by the data
      models written for Large-Scale Measurement Platforms (LMAPs).
      This module defines typedefs and groupings but no schema
      tree elements.";

Schoenwaelder & Bajpai Standards Track [Page 10] RFC 8194 YANG Data Model for LMAP August 2017

   revision "2017-08-08" {
     description
       "Initial version";
     reference
       "RFC 8194: A YANG Data Model for LMAP Measurement Agents";
   }
   /*
    * Typedefs
    */
   typedef identifier {
     type string {
       length "1..max";
     }
     description
       "A string value used to name something.";
   }
   typedef tag {
     type string {
       length "1..max";
     }
     description
       "A tag consists of at least one character.";
   }
   typedef glob-pattern {
     type string {
       length "1..max";
     }
     description
       'A glob style pattern (following POSIX.2 fnmatch() without
        special treatment of file paths):
  • matches a sequence of characters

? matches a single character

          [seq]     matches any character in seq
          [!seq]    matches any character not in seq
        A backslash followed by a character matches the following
        character.  In particular:
          \*        matches *
          \?        matches ?
          \\        matches \

Schoenwaelder & Bajpai Standards Track [Page 11] RFC 8194 YANG Data Model for LMAP August 2017

        A sequence seq may be a sequence of characters (e.g., [abc]
        or a range of characters (e.g., [a-c]).';
   }
   typedef wildcard {
     type string {
       pattern '\*';
     }
     description
       "A wildcard for calendar scheduling entries.";
   }
   typedef cycle-number {
     type string {
       pattern '[0-9]{8}\.[0-9]{6}';
     }
     description
       "A cycle number represented in the format YYYYMMDD.HHMMSS
        where YYYY represents the year, MM the month (1..12), DD
        the day of the months (01..31), HH the hour (00..23), MM
        the minute (00..59), and SS the second (00..59).  The cycle
        number is using Coordinated Universal Time (UTC).";
   }
   typedef month {
     type enumeration {
       enum january {
         value 1;
         description
           "January of the Gregorian calendar.";
       }
       enum february {
         value 2;
         description
           "February of the Gregorian calendar.";
       }
       enum march {
         value 3;
         description
           "March of the Gregorian calendar.";
       }
       enum april {
         value 4;
         description
           "April of the Gregorian calendar.";
       }

Schoenwaelder & Bajpai Standards Track [Page 12] RFC 8194 YANG Data Model for LMAP August 2017

       enum may {
         value 5;
         description
           "May of the Gregorian calendar.";
       }
       enum june {
         value 6;
         description
           "June of the Gregorian calendar.";
       }
       enum july {
         value 7;
         description
           "July of the Gregorian calendar.";
       }
       enum august {
         value 8;
         description
           "August of the Gregorian calendar.";
       }
       enum september {
         value 9;
         description
           "September of the Gregorian calendar.";
       }
       enum october {
         value 10;
         description
           "October of the Gregorian calendar.";
       }
       enum november {
         value 11;
         description
           "November of the Gregorian calendar.";
       }
       enum december {
         value 12;
         description
           "December of the Gregorian calendar.";
       }
     }
     description
       "A type modeling the month in the Gregorian calendar.";
   }

Schoenwaelder & Bajpai Standards Track [Page 13] RFC 8194 YANG Data Model for LMAP August 2017

   typedef month-or-all {
     type union {
       type month;
       type wildcard;
     }
     description
       "A month or a wildcard indicating all twelve months.";
   }
   typedef day-of-month {
     type uint8 { range "1..31"; }
     description
       "A day of a month of the Gregorian calendar.";
   }
   typedef day-of-months-or-all {
     type union {
       type day-of-month;
       type wildcard;
     }
     description
       "A day of a month or a wildcard indicating all days
        of a month.";
   }
   typedef weekday {
     type enumeration {
       enum monday {
         value 1;
         description
           "Monday of the Gregorian calendar.";
       }
       enum tuesday {
         value 2;
         description
           "Tuesday of the Gregorian calendar.";
       }
       enum wednesday {
         value 3;
         description
           "Wednesday of the Gregorian calendar.";
       }
       enum thursday {
         value 4;
         description
           "Thursday of the Gregorian calendar.";
       }

Schoenwaelder & Bajpai Standards Track [Page 14] RFC 8194 YANG Data Model for LMAP August 2017

       enum friday {
         value 5;
         description
           "Friday of the Gregorian calendar.";
       }
       enum saturday {
         value 6;
         description
           "Saturday of the Gregorian calendar.";
       }
       enum sunday {
         value 7;
         description
           "Sunday of the Gregorian calendar.";
       }
     }
     description
      "A type modeling the weekdays in the Gregorian calendar.
       The numbering follows the ISO 8601 scheme.";
     reference
      "ISO 8601:2004: Data elements and interchange formats --
                      Information interchange -- Representation
                      of dates and times";
   }
   typedef weekday-or-all {
     type union {
       type weekday;
       type wildcard;
     }
     description
       "A weekday or a wildcard indicating all seven weekdays.";
   }
   typedef hour {
     type uint8 { range "0..23"; }
     description
       "An hour of a day.";
   }
   typedef hour-or-all {
     type union {
       type hour;
       type wildcard;
     }
     description
       "An hour of a day or a wildcard indicating all hours
        of a day.";

Schoenwaelder & Bajpai Standards Track [Page 15] RFC 8194 YANG Data Model for LMAP August 2017

   }
   typedef minute {
     type uint8 { range "0..59"; }
     description
       "A minute of an hour.";
   }
   typedef minute-or-all {
     type union {
       type minute;
       type wildcard;
     }
     description
       "A minute of an hour or a wildcard indicating all
        minutes of an hour.";
   }
   typedef second {
     type uint8 { range "0..59"; }
     description
       "A second of a minute.";
   }
   typedef second-or-all {
     type union {
       type second;
       type wildcard;
     }
     description
       "A second of a minute or a wildcard indicating all
        seconds of a minute.";
   }
   typedef status-code {
     type int32;
     description
       "A status code returned by the execution of a Task.  Note
        that the actual range is implementation dependent, but it
        should be portable to use values in the range 0..127 for
        regular exit codes.  By convention, 0 indicates successful
        termination.  Negative values may be used to indicate
        abnormal termination due to a signal; the absolute value
        may identify the signal number in this case.";
   }

Schoenwaelder & Bajpai Standards Track [Page 16] RFC 8194 YANG Data Model for LMAP August 2017

   typedef timezone-offset {
     type string {
       pattern 'Z|[\+\-]\d{2}:\d{2}';
     }
     description
       "A time zone offset as it is used by the date-and-time type
        defined in the ietf-yang-types module.  The value Z is
        equivalent to +00:00.  The value -00:00 indicates an
        unknown time-offset.";
     reference
       "RFC 6991: Common YANG Data Types";
   }
   /*
    * Groupings
    */
   grouping registry-grouping {
     description
       "This grouping models a list of entries in a registry
        that identify functions of a Task.";
     list function {
       key uri;
       description
         "A list of entries in a registry identifying functions.";
       leaf uri {
         type inet:uri;
         description
           "A URI identifying an entry in a registry.";
       }
       leaf-list role {
         type string;
         description
           "A set of roles for the identified registry entry.";
       }
     }
   }
   grouping options-grouping {
     description
       "A list of options of a Task.  Each option is a name/value
        pair (where the value may be absent).";
     list option {
       key "id";

Schoenwaelder & Bajpai Standards Track [Page 17] RFC 8194 YANG Data Model for LMAP August 2017

       ordered-by user;
       description
         "A list of options passed to the Task.  It is a list of
          key/value pairs and may be used to model options.
          Options may be used to identify the role of a Task
          or to pass a Channel name to a Task.";
       leaf id {
         type lmap:identifier;
         description
           "An identifier uniquely identifying an option.  This
            identifier is required by YANG to uniquely identify
            a name/value pair, but it otherwise has no semantic
            value";
       }
       leaf name {
         type string;
         description
           "The name of the option.";
       }
       leaf value {
         type string;
         description
           "The value of the option.";
       }
     }
   }
 }
 <CODE ENDS>

4.2. LMAP Control YANG Module

 This module imports definitions from [RFC6536], [RFC6991], and the
 common LMAP module, and it references [RFC7398].
 <CODE BEGINS> file "ietf-lmap-control@2017-08-08.yang"
 module ietf-lmap-control {
   yang-version 1.1;
   namespace "urn:ietf:params:xml:ns:yang:ietf-lmap-control";
   prefix "lmapc";
   import ietf-yang-types {
     prefix yang;
   }
   import ietf-netconf-acm {

Schoenwaelder & Bajpai Standards Track [Page 18] RFC 8194 YANG Data Model for LMAP August 2017

     prefix nacm;
   }
   import ietf-lmap-common {
     prefix lmap;
   }
   organization
     "IETF Large-Scale Measurement of Broadband Performance
      Working Group";
   contact
     "WG Web:   <https://datatracker.ietf.org/wg/lmap>
      WG List:  <mailto:lmap@ietf.org>
      Editor:   Juergen Schoenwaelder
                <j.schoenwaelder@jacobs-university.de>
      Editor:   Vaibhav Bajpai
                <bajpaiv@in.tum.de>";
   description
     "This module defines a data model for controlling Measurement
      Agents that are part of a Large-Scale Measurement Platform
      (LMAP).  This data model is expected to be implemented by
      Measurement Agents.";
   revision "2017-08-08" {
     description
       "Initial version";
     reference
       "RFC 8194: A YANG Data Model for LMAP Measurement Agents";
   }
   /*
    * Typedefs
    */
   typedef event-ref {
     type leafref {
       path "/lmap/events/event/name";
     }
     description
       "This type is used by data models that need to reference
        a configured event source.";
   }
   typedef task-ref {
     type leafref {

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       path "/lmap/tasks/task/name";
     }
     description
       "This type is used by data models that need to reference
        a configured Task.";
   }
   typedef schedule-ref {
     type leafref {
       path "/lmap/schedules/schedule/name";
     }
     description
       "This type is used by data models that need to reference
        a configured Schedule.";
   }
   /*
    * Groupings
    */
   grouping start-end-grouping {
     description
       "A grouping that provides start and end times for
        Event objects.";
     leaf start {
       type yang:date-and-time;
       description
         "The date and time when the Event object
          starts to create triggers.";
     }
     leaf end {
       type yang:date-and-time;
       description
         "The date and time when the Event object
          stops to create triggers.
          It is generally a good idea to always configure
          an end time and to refresh the end time as needed
          to ensure that agents that lose connectivity to
          their Controller do not continue executing Schedules
          forever.";
     }
   }
   /*
    * Capability, configuration, and state data nodes
    */

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   container lmap {
     description
       "Configuration and control of a Measurement Agent.";
     container capabilities {
       config false;
       description
         "Agent capabilities including a list of supported Tasks.";
       leaf version {
         type string;
         config false;
         mandatory true;
         description
           "A short description of the software implementing the
            Measurement Agent.  This should include the version
            number of the Measurement Agent software.";
       }
       leaf-list tag {
         type lmap:tag;
         config false;
         description
           "An optional unordered set of tags that provide
            additional information about the capabilities of
            the Measurement Agent.";
       }
       container tasks {
         description
           "A list of Tasks that the Measurement Agent supports.";
         list task {
           key name;
           description
             "The list of Tasks supported by the Measurement Agent.";
           leaf name {
             type lmap:identifier;
             description
               "The unique name of a Task capability.";
           }
           uses lmap:registry-grouping;
           leaf version {
             type string;

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             description
               "A short description of the software implementing
                the Task.  This should include the version
                number of the Measurement Task software.";
           }
           leaf program {
             type string;
             description
               "The (local) program to invoke in order to execute
                the Task.";
           }
         }
       }
     }
     /*
      * Agent Configuration
      */
     container agent {
       description
         "Configuration of parameters affecting the whole
          Measurement Agent.";
       leaf agent-id {
         type yang:uuid;
         description
           "The agent-id identifies a Measurement Agent with
            a very low probability of collision.  In certain
            deployments, the agent-id may be considered
            sensitive, and hence this object is optional.";
       }
       leaf group-id {
         type string;
         description
           "The group-id identifies a group of Measurement
            Agents.  In certain deployments, the group-id
            may be considered less sensitive than the
            agent-id.";
       }
       leaf measurement-point {
         type string;
         description
           "The measurement point indicating where the
             Measurement Agent is located on a path.";

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         reference
           "RFC 7398: A Reference Path and Measurement Points
                      for Large-Scale Measurement of Broadband
                      Performance";
       }
       leaf report-agent-id {
         type boolean;
         must '. != "true" or ../agent-id' {
           description
             "An agent-id must exist for this to be set
              to true.";
         }
         default false;
         description
           "The 'report-agent-id' controls whether the
            'agent-id' is reported to Collectors.";
       }
       leaf report-group-id {
         type boolean;
         must '. != "true" or ../group-id' {
           description
             "A group-id must exist for this to be set
              to true.";
         }
         default false;
         description
           "The 'report-group-id' controls whether the
            'group-id' is reported to Collectors.";
       }
       leaf report-measurement-point {
         type boolean;
         must '. != "true" or ../measurement-point' {
           description
             "A measurement-point must exist for this to be
              set to true.";
         }
         default false;
         description
           "The 'report-measurement-point' controls whether
            the 'measurement-point' is reported to Collectors.";
       }
       leaf controller-timeout {
         type uint32;
         units "seconds";

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         description
           "A timer is started after each successful contact
            with a Controller.  When the timer reaches the
            controller-timeout, an event (controller-lost) is
            raised indicating that connectivity to the Controller
            has been lost.";
       }
       leaf last-started {
         type yang:date-and-time;
         config false;
         mandatory true;
         description
           "The date and time the Measurement Agent last started.";
       }
     }
     /*
      * Task Configuration
      */
     container tasks {
       description
         "Configuration of LMAP Tasks.";
       list task {
         key name;
         description
           "The list of Tasks configured on the Measurement
            Agent.  Note that a configured Task MUST resolve to a
            Task listed in the capabilities.  Attempts to execute
            a configured Task that is not listed in the capabilities
            result in a runtime execution error.";
         leaf name {
           type lmap:identifier;
           description
             "The unique name of a Task.";
         }
         uses lmap:registry-grouping;
         leaf program {
           type string;
           nacm:default-deny-write;

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           description
             "The (local) program to invoke in order to execute
              the Task.  If this leaf is not set, then the system
              will try to identify a suitable program based on
              the registry information present.";
         }
         uses lmap:options-grouping {
           description
             "The list of Task-specific options.";
         }
         leaf-list tag {
           type lmap:identifier;
           description
             "A set of Task-specific tags that are reported
              together with the measurement results to a Collector.
              A tag can be used, for example, to carry the
              Measurement Cycle ID.";
         }
       }
     }
     /*
      * Schedule Instructions
      */
     container schedules {
       description
         "Configuration of LMAP Schedules.  Schedules control
          which Tasks are executed by the LMAP implementation.";
       list schedule {
         key name;
         description
           "Configuration of a particular Schedule.";
         leaf name {
           type lmap:identifier;
           description
             "The locally unique, administratively assigned name
              for this Schedule.";
         }
         leaf start {
           type event-ref;
           mandatory true;

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           description
             "The event source controlling the start of the
              scheduled Actions.";
         }
         choice stop {
           description
             "This choice contains optional leafs that control the
              graceful forced termination of scheduled Actions.
              When the end has been reached, the scheduled Actions
              should be forced to terminate the measurements.
              This may involve being active some additional time in
              order to properly finish the Action's activity (e.g.,
              waiting for any messages that are still outstanding).";
           leaf end {
             type event-ref;
             description
               "The event source controlling the graceful
                forced termination of the scheduled Actions.";
           }
           leaf duration {
             type uint32;
             units "seconds";
             description
               "The duration controlling the graceful forced
                termination of the scheduled Actions.";
           }
         }
         leaf execution-mode {
           type enumeration {
             enum sequential {
               value 1;
               description
                 "The Actions of the Schedule are executed
                  sequentially.";
             }
             enum parallel {
               value 2;
               description
                 "The Actions of the Schedule are executed
                  concurrently.";
             }
             enum pipelined {
               value 3;

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               description
                 "The Actions of the Schedule are executed in a
                  pipelined mode.  Output created by an Action is
                  passed as input to the subsequent Action.";
             }
           }
           default pipelined;
           description
             "The execution mode of this Schedule determines in
              which order the Actions of the Schedule are executed.";
         }
         leaf-list tag {
           type lmap:tag;
           description
             "A set of Schedule-specific tags that are reported
              together with the measurement results to a Collector.";
         }
         leaf-list suppression-tag {
           type lmap:tag;
           description
             "A set of Suppression tags that are used to select
              Schedules to be suppressed.";
         }
         leaf state {
           type enumeration {
             enum enabled {
               value 1;
               description
                 "The value 'enabled' indicates that the
                  Schedule is currently enabled.";
             }
             enum disabled {
               value 2;
               description
                 "The value 'disabled' indicates that the
                  Schedule is currently disabled.";
             }
             enum running {
               value 3;
               description
                 "The value 'running' indicates that the
                  Schedule is currently running.";
             }
             enum suppressed {
               value 4;

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               description
                 "The value 'suppressed' indicates that the
                  Schedule is currently suppressed.";
             }
           }
           config false;
           mandatory true;
           description
             "The current state of the Schedule.";
         }
         leaf storage {
           type yang:gauge64;
           units "bytes";
           config false;
           mandatory true;
           description
             "The amount of secondary storage (e.g., allocated in a
              file system) holding temporary data allocated to the
              Schedule in bytes.  This object reports the amount of
              allocated physical storage and not the storage used
              by logical data records.";
         }
         leaf invocations {
           type yang:counter32;
           config false;
           mandatory true;
           description
             "Number of invocations of this Schedule.  This counter
              does not include suppressed invocations or invocations
              that were prevented due to an overlap with a previous
              invocation of this Schedule.";
         }
         leaf suppressions {
           type yang:counter32;
           config false;
           mandatory true;
           description
             "Number of suppressed executions of this Schedule.";
         }
         leaf overlaps {
           type yang:counter32;
           config false;
           mandatory true;

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           description
             "Number of executions prevented due to overlaps with
              a previous invocation of this Schedule.";
         }
         leaf failures {
           type yang:counter32;
           config false;
           mandatory true;
           description
             "Number of failed executions of this Schedule.  A
              failed execution is an execution where at least
              one Action failed.";
         }
         leaf last-invocation {
           type yang:date-and-time;
           config false;
           description
             "The date and time of the last invocation of
              this Schedule.";
         }
         list action {
           key name;
           description
             "An Action describes a Task that is invoked by the
              Schedule.  Multiple Actions are invoked according to
              the execution-mode of the Schedule.";
           leaf name {
             type lmap:identifier;
             description
               "The unique identifier for this Action.";
           }
           leaf task {
             type task-ref;
             mandatory true;
             description
               "The Task invoked by this Action.";
           }
           container parameters {
             description
               "This container is a placeholder for runtime
                parameters defined in Task-specific data models
                augmenting the base LMAP control data model.";

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             choice extension {
               description
                 "This choice is provided to augment in different
                  sets of parameters.";
             }
           }
           uses lmap:options-grouping {
             description
               "The list of Action-specific options that are
                appended to the list of Task-specific options.";
           }
           leaf-list destination {
             type schedule-ref;
             description
               "A set of Schedules receiving the output produced
                by this Action.  The output is stored temporarily
                since the Destination Schedules will in general
                not be running when output is passed to them.  The
                behavior of an Action passing data to its own
                Schedule is implementation specific.
                Data passed to a sequential or pipelined Schedule
                is received by the Schedule's first Action.  Data
                passed to a parallel Schedule is received by all
                Actions of the Schedule.";
           }
           leaf-list tag {
             type lmap:tag;
             description
               "A set of Action-specific tags that are reported
                together with the measurement results to a
                Collector.";
           }
           leaf-list suppression-tag {
             type lmap:tag;
             description
               "A set of Suppression tags that are used to select
                Actions to be suppressed.";
           }
           leaf state {
             type enumeration {
               enum enabled {
                 value 1;

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                 description
                   "The value 'enabled' indicates that the
                    Action is currently enabled.";
               }
               enum disabled {
                 value 2;
                 description
                   "The value 'disabled' indicates that the
                    Action is currently disabled.";
               }
               enum running {
                 value 3;
                 description
                   "The value 'running' indicates that the
                    Action is currently running.";
               }
               enum suppressed {
                 value 4;
                 description
                   "The value 'suppressed' indicates that the
                    Action is currently suppressed.";
               }
             }
             config false;
             mandatory true;
             description
               "The current state of the Action.";
           }
           leaf storage {
             type yang:gauge64;
             units "bytes";
             config false;
             mandatory true;
             description
               "The amount of secondary storage (e.g., allocated in a
                file system) holding temporary data allocated to the
                Schedule in bytes.  This object reports the amount of
                allocated physical storage and not the storage used
                by logical data records.";
           }
           leaf invocations {
             type yang:counter32;
             config false;
             mandatory true;

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             description
               "Number of invocations of this Action.  This counter
                does not include suppressed invocations or invocations
                that were prevented due to an overlap with a previous
                invocation of this Action.";
           }
           leaf suppressions {
             type yang:counter32;
             config false;
             mandatory true;
             description
               "Number of suppressed executions of this Action.";
           }
           leaf overlaps {
             type yang:counter32;
             config false;
             mandatory true;
             description
               "Number of executions prevented due to overlaps with
                a previous invocation of this Action.";
           }
           leaf failures {
             type yang:counter32;
             config false;
             mandatory true;
             description
               "Number of failed executions of this Action.";
           }
           leaf last-invocation {
             type yang:date-and-time;
             config false;
             mandatory true;
             description
               "The date and time of the last invocation of
                this Action.";
           }
           leaf last-completion {
             type yang:date-and-time;
             config false;
             mandatory true;
             description
               "The date and time of the last completion of
                this Action.";

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           }
           leaf last-status {
             type lmap:status-code;
             config false;
             mandatory true;
             description
               "The status code returned by the last execution of
                this Action.";
           }
           leaf last-message {
             type string;
             config false;
             mandatory true;
             description
               "The status message produced by the last execution
                of this Action.";
           }
           leaf last-failed-completion {
             type yang:date-and-time;
             config false;
             mandatory true;
             description
               "The date and time of the last failed completion
                of this Action.";
           }
           leaf last-failed-status {
             type lmap:status-code;
             config false;
             mandatory true;
             description
               "The status code returned by the last failed
                execution of this Action.";
           }
           leaf last-failed-message {
             type string;
             config false;
             mandatory true;
             description
               "The status message produced by the last failed
                execution of this Action.";
           }
         }
       }

Schoenwaelder & Bajpai Standards Track [Page 33] RFC 8194 YANG Data Model for LMAP August 2017

     }
     /*
      * Suppression Instructions
      */
     container suppressions {
       description
         "Suppression information to prevent Schedules or
          certain Actions from starting.";
       list suppression {
         key name;
         description
           "Configuration of a particular Suppression.";
         leaf name {
           type lmap:identifier;
           description
             "The locally unique, administratively assigned name
              for this Suppression.";
         }
         leaf start {
           type event-ref;
           description
             "The event source controlling the start of the
              Suppression period.";
         }
         leaf end {
           type event-ref;
           description
             "The event source controlling the end of the
              Suppression period.  If not present, Suppression
              continues indefinitely.";
         }
         leaf-list match {
           type lmap:glob-pattern;
           description
             "A set of Suppression match patterns.  The Suppression
              will apply to all Schedules (and their Actions) that
              have a matching value in their suppression-tags
              and to all Actions that have a matching value in
              their suppression-tags.";
         }

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         leaf stop-running {
           type boolean;
           default false;
           description
             "If 'stop-running' is true, running Schedules and
              Actions matching the Suppression will be terminated
              when Suppression is activated.  If 'stop-running' is
              false, running Schedules and Actions will not be
              affected if Suppression is activated.";
         }
         leaf state {
           type enumeration {
             enum enabled {
               value 1;
               description
                 "The value 'enabled' indicates that the
                  Suppression is currently enabled.";
             }
             enum disabled {
               value 2;
               description
                 "The value 'disabled' indicates that the
                  Suppression is currently disabled.";
             }
             enum active {
               value 3;
               description
                 "The value 'active' indicates that the
                  Suppression is currently active.";
             }
           }
           config false;
           mandatory true;
           description
             "The current state of the Suppression.";
         }
       }
     }
     /*
      * Event Instructions
      */
     container events {
       description
         "Configuration of LMAP events.

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          Implementations may be forced to delay acting
          upon the occurrence of events in the face of local
          constraints.  An Action triggered by an event
          therefore should not rely on the accuracy
          provided by the scheduler implementation.";
       list event {
         key name;
         description
           "The list of event sources configured on the
            Measurement Agent.";
         leaf name {
           type lmap:identifier;
           description
             "The unique name of an event source.";
         }
         leaf random-spread {
           type uint32;
           units seconds;
           description
             "This optional leaf adds a random spread to the
              computation of the event's trigger time.  The
              random spread is a uniformly distributed random
              number taken from the interval [0:random-spread].";
         }
         leaf cycle-interval {
           type uint32;
           units seconds;
           description
             "The optional cycle-interval defines the duration
              of the time interval in seconds that is used to
              calculate cycle numbers.  No cycle number is
              calculated if the optional cycle-interval does
              not exist.";
         }
         choice event-type {
           description
             "Different types of events are handled by
              different branches of this choice.  Note that
              this choice can be extended via augmentations.";
           case periodic {
             container periodic {

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               description
                 "A periodic timing object triggers periodically
                  according to a regular interval.";
               leaf interval {
                 type uint32 {
                   range "1..max";
                 }
                 units "seconds";
                 mandatory true;
                 description
                   "The number of seconds between two triggers
                    generated by this periodic timing object.";
               }
               uses start-end-grouping;
             }
           }
           case calendar {
             container calendar {
               description
                 "A calendar timing object triggers based on the
                  current calendar date and time.";
               leaf-list month {
                 type lmap:month-or-all;
                 min-elements 1;
                 description
                   "A set of months at which this calendar timing
                    will trigger.  The wildcard means all months.";
               }
               leaf-list day-of-month {
                 type lmap:day-of-months-or-all;
                 min-elements 1;
                 description
                   "A set of days of the month at which this
                    calendar timing will trigger.  The wildcard means
                    all days of a month.";
               }
               leaf-list day-of-week {
                 type lmap:weekday-or-all;
                 min-elements 1;
                 description
                   "A set of weekdays at which this calendar timing
                    will trigger.  The wildcard means all weekdays.";
               }

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               leaf-list hour {
                 type lmap:hour-or-all;
                 min-elements 1;
                 description
                   "A set of hours at which this calendar timing will
                    trigger.  The wildcard means all hours of a day.";
               }
               leaf-list minute {
                 type lmap:minute-or-all;
                 min-elements 1;
                 description
                   "A set of minutes at which this calendar timing
                    will trigger.  The wildcard means all minutes of
                    an hour.";
               }
               leaf-list second {
                 type lmap:second-or-all;
                 min-elements 1;
                 description
                   "A set of seconds at which this calendar timing
                    will trigger.  The wildcard means all seconds of
                    a minute.";
               }
               leaf timezone-offset {
                 type lmap:timezone-offset;
                 description
                   "The time zone in which this calendar timing
                    object will be evaluated.  If not present,
                    the system's local time zone will be used.";
               }
               uses start-end-grouping;
             }
           }
           case one-off {
             container one-off {
               description
                 "A one-off timing object triggers exactly once.";
               leaf time {
                 type yang:date-and-time;
                 mandatory true;
                 description
                   "This one-off timing object triggers once at
                    the configured date and time.";

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               }
             }
           }
           case immediate {
             leaf immediate {
               type empty;
               mandatory true;
               description
                 "This immediate Event object triggers immediately
                  when it is configured.";
             }
           }
           case startup {
             leaf startup {
               type empty;
               mandatory true;
               description
                 "This startup Event object triggers whenever the
                  Measurement Agent (re)starts.";
             }
           }
           case controller-lost {
             leaf controller-lost {
               type empty;
               mandatory true;
               description
                 "The controller-lost Event object triggers when
                  the connectivity to the Controller has been lost
                  for at least 'controller-timeout' seconds.";
             }
           }
           case controller-connected {
             leaf controller-connected {
               type empty;
               mandatory true;
               description
                 "The controller-connected Event object triggers
                  when the connectivity to the Controller has been
                  restored after it was lost for at least
                  'controller-timeout' seconds.";
             }
           }
         }

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       }
     }
   }
 }
 <CODE ENDS>

4.3. LMAP Report YANG Module

 This module imports definitions from [RFC6536] and the common LMAP
 module.
 <CODE BEGINS> file "ietf-lmap-report@2017-08-08.yang"
 module ietf-lmap-report {
   yang-version 1.1;
   namespace "urn:ietf:params:xml:ns:yang:ietf-lmap-report";
   prefix "lmapr";
   import ietf-yang-types {
     prefix yang;
   }
   import ietf-lmap-common {
     prefix lmap;
   }
   organization
     "IETF Large-Scale Measurement of Broadband Performance
      Working Group";
   contact
     "WG Web:   <https://datatracker.ietf.org/wg/lmap>
      WG List:  <mailto:lmap@ietf.org>
      Editor:   Juergen Schoenwaelder
                <j.schoenwaelder@jacobs-university.de>
      Editor:   Vaibhav Bajpai
                <bajpaiv@in.tum.de>";
   description
     "This module defines a data model for reporting results from
      Measurement Agents, which are part of a Large-Scale Measurement
      Platform (LMAP), to result data Collectors.  This data model is
      expected to be implemented by a Collector.";
   revision "2017-08-08" {
     description
       "Initial version";

Schoenwaelder & Bajpai Standards Track [Page 40] RFC 8194 YANG Data Model for LMAP August 2017

     reference
       "RFC 8194: A YANG Data Model for LMAP Measurement Agents";
   }
   rpc report {
     description
       "The report operation is used by a Measurement Agent to
        submit measurement results produced by Measurement Tasks to
        a Collector.";
     input {
       leaf date {
         type yang:date-and-time;
         mandatory true;
         description
           "The date and time when this result report was sent to
            a Collector.";
       }
       leaf agent-id {
         type yang:uuid;
         description
           "The agent-id of the agent from which this
            report originates.";
       }
       leaf group-id {
         type string;
         description
           "The group-id of the agent from which this
            report originates.";
       }
       leaf measurement-point {
         type string;
         description
           "The measurement-point of the agent from which this
            report originates.";
       }
       list result {
         description
           "The list of Tasks for which results are reported.";
         leaf schedule {
           type lmap:identifier;

Schoenwaelder & Bajpai Standards Track [Page 41] RFC 8194 YANG Data Model for LMAP August 2017

           description
             "The name of the Schedule that produced the result.";
         }
         leaf action {
           type lmap:identifier;
           description
             "The name of the Action in the Schedule that produced
              the result.";
         }
         leaf task {
           type lmap:identifier;
           description
             "The name of the Task that produced the result.";
         }
         container parameters {
           description
             "This container is a placeholder for runtime
              parameters defined in Task-specific data models
              augmenting the base LMAP report data model.";
           choice extension {
             description
               "This choice is provided to augment in different
                sets of parameters.";
           }
         }
         uses lmap:options-grouping {
           description
             "The list of options there were in use when the
              measurement was performed.  This list must include
              both the Task-specific options as well as the
              Action-specific options.";
         }
         leaf-list tag {
           type lmap:tag;
           description
             "A tag contains additional information that is passed
              with the result record to the Collector.  This is the
              joined set of tags defined for the Task object, the
              Schedule object, and the Action object.  A tag can be
              used to carry the Measurement Cycle ID.";
         }

Schoenwaelder & Bajpai Standards Track [Page 42] RFC 8194 YANG Data Model for LMAP August 2017

         leaf event {
           type yang:date-and-time;
           description
             "The date and time of the event that triggered the
              Schedule of the Action that produced the reported
              result values.  The date and time does not include
              any added randomization.";
         }
         leaf start {
           type yang:date-and-time;
           mandatory true;
           description
             "The date and time when the Task producing
              this result started.";
         }
         leaf end {
           type yang:date-and-time;
           description
             "The date and time when the Task producing
              this result finished.";
         }
         leaf cycle-number {
           type lmap:cycle-number;
           description
             "The optional cycle number is the time closest to
              the time reported in the event leaf that is a multiple
              of the cycle-interval of the event that triggered the
              execution of the Schedule.  The value is only present
              if the event that triggered the execution of the
              Schedule has a defined cycle-interval.";
         }
         leaf status {
           type lmap:status-code;
           mandatory true;
           description
             "The status code returned by the execution of this
              Action.";
         }
         list conflict {
           description
             "The names of Tasks overlapping with the execution
              of the Task that has produced this result.";

Schoenwaelder & Bajpai Standards Track [Page 43] RFC 8194 YANG Data Model for LMAP August 2017

           leaf schedule-name {
             type lmap:identifier;
             description
               "The name of a Schedule that might have impacted
                the execution of the Task that has produced this
                result.";
           }
           leaf action-name {
             type lmap:identifier;
             description
               "The name of an Action within the Schedule that
                might have impacted the execution of the Task that
                has produced this result.";
           }
           leaf task-name {
             type lmap:identifier;
             description
               "The name of the Task executed by an Action within
                the Schedule that might have impacted the execution
                of the Task that has produced this result.";
           }
         }
         list table {
           description
             "A list of result tables.";
           uses lmap:registry-grouping;
           leaf-list column {
             type string;
             description
               "An ordered list of column labels.  The order is
                determined by the system and must match the order
                of the columns in the result rows.";
           }
           list row {
             description
               "The rows of a result table.";
             leaf-list value {
               type string;
               description
                 "The value of a cell in the result row.";
             }

Schoenwaelder & Bajpai Standards Track [Page 44] RFC 8194 YANG Data Model for LMAP August 2017

           }
         }
       }
     }
   }
 }
 <CODE ENDS>

5. Security Considerations

 The YANG module defined in this document is designed to be accessed
 via network management protocols such as NETCONF [RFC6241] or
 RESTCONF [RFC8040].  The lowest NETCONF layer is the secure transport
 layer, and the mandatory-to-implement secure transport is Secure
 Shell (SSH) [RFC6242].  The lowest RESTCONF layer is HTTPS, and the
 mandatory-to-implement secure transport is Transport Layer Security
 (TLS) [RFC5246].
 The NETCONF access control model [RFC6536] provides the means to
 restrict access for particular NETCONF or RESTCONF users to a
 preconfigured subset of all available NETCONF or RESTCONF protocol
 operations and content.
 There are a number of data nodes defined in this YANG module that are
 writable/creatable/deletable (i.e., config true, which is the
 default).  These data nodes may be considered sensitive or vulnerable
 in some network environments.  Write operations (e.g., edit-config)
 to these data nodes without proper protection can have a negative
 effect on network operations.  These are the subtrees and data nodes
 and their sensitivity/vulnerability:
 /lmap/agent           This subtree configures general properties of
                       the Measurement Agent such as its identity,
                       measurement point, or Controller timeout.  This
                       subtree should only have write access for the
                       system responsible for configuring the
                       Measurement Agent.
 /lmap/tasks           This subtree configures the Tasks that can be
                       invoked by a Controller.  This subtree should
                       only have write access for the system
                       responsible for configuring the Measurement
                       Agent.  Care must be taken to not expose Tasks
                       to a Controller that can cause damage to the
                       system or the network.

Schoenwaelder & Bajpai Standards Track [Page 45] RFC 8194 YANG Data Model for LMAP August 2017

 /lmap/schedules       This subtree is used by a Controller to define
                       the Schedules and Actions that are executed
                       when certain events occur.  Unauthorized access
                       can cause unwanted load on the device or
                       network, or it might direct measurement traffic
                       to targets that become victims of an attack.
 /lmap/suppressions    This subtree is used by a Controller to define
                       Suppressions that can temporarily disable the
                       execution of Schedules or Actions.
                       Unauthorized access can either disable
                       measurements that should normally take place or
                       cause measurements to take place during times
                       when normally no measurements should take
                       place.
 /lmap/events          This subtree is used by a Controller to define
                       events that trigger the execution of Schedules
                       and Actions.  Unauthorized access can either
                       disable measurements that should normally take
                       place or cause measurements to take place
                       during times when normally no measurements
                       should take place or at a frequency that is
                       higher than normally expected.
 Some of the readable data nodes in this YANG module may be considered
 sensitive or vulnerable in some network environments.  It is thus
 important to control read access (e.g., via get, get-config, or
 notification) to these data nodes.  These are the subtrees and data
 nodes and their sensitivity/vulnerability:
 /lmap/agent           This subtree provides information about the
                       Measurement Agent.  This information may be
                       used to select specific targets for attacks.
 /lmap/capabilities    This subtree provides information about the
                       capabilities of the Measurement Agent,
                       including its software version number and the
                       Tasks that it supports.  This information may
                       be used to execute targeted attacks against
                       specific implementations.
 /lmap/schedules       This subtree provides information about the
                       Schedules and their associated Actions executed
                       on the Measurement Agent.  This information may
                       be used to check whether attacks against the
                       implementation are effective.

Schoenwaelder & Bajpai Standards Track [Page 46] RFC 8194 YANG Data Model for LMAP August 2017

 /lmap/suppressions    This subtree provides information about the
                       Suppressions that can be active on the
                       Measurement Agent.  This information may be
                       used to predict time periods where measurements
                       take place (or do not take place).
 Some of the RPC operations in this YANG module may be considered
 sensitive or vulnerable in some network environments.  It is thus
 important to control access to these operations.  These are the
 operations and their sensitivity/vulnerability:
 /report   The report operation is used to send locally collected
           measurement results to a remote Collector.  Unauthorized
           access may leak measurement results, including those from
           passive measurements.
 The data model uses a number of identifiers that are set by the
 Controller.  Implementors may find these identifiers useful for the
 identification of resources, e.g., to identify objects in a file
 system providing temporary storage.  Since the identifiers used by
 the YANG data model may allow characters that may be given special
 interpretation in a specific context, implementations must ensure
 that identifiers are properly mapped into safe identifiers.
 The data model allows specifying options in the form of name/value
 pairs that are passed to programs.  Implementors ought to take care
 that option names and values are passed literally to programs.  In
 particular, shell expansions that may alter option names and values
 must not be performed.

6. IANA Considerations

 This document registers three URIs in the "IETF XML Registry"
 [RFC3688].  Following the format in RFC 3688, the following
 registrations have been made.
       URI: urn:ietf:params:xml:ns:yang:ietf-lmap-common
       Registrant Contact: The IESG.
       XML: N/A; the requested URI is an XML namespace.
       URI: urn:ietf:params:xml:ns:yang:ietf-lmap-control
       Registrant Contact: The IESG.
       XML: N/A; the requested URI is an XML namespace.
       URI: urn:ietf:params:xml:ns:yang:ietf-lmap-report
       Registrant Contact: The IESG.
       XML: N/A; the requested URI is an XML namespace.

Schoenwaelder & Bajpai Standards Track [Page 47] RFC 8194 YANG Data Model for LMAP August 2017

 This document registers three YANG modules in the "YANG Module Names"
 registry [RFC6020].
       Name: ietf-lmap-common
       Namespace: urn:ietf:params:xml:ns:yang:ietf-lmap-common
       Prefix: lmap
       Reference: RFC 8194
       Name: ietf-lmap-control
       Namespace: urn:ietf:params:xml:ns:yang:ietf-lmap-control
       Prefix: lmapc
       Reference: RFC 8194
       Name: ietf-lmap-report
       Namespace: urn:ietf:params:xml:ns:yang:ietf-lmap-report
       Prefix: lmapr
       Reference: RFC 8194

7. References

7.1. 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,
            <https://www.rfc-editor.org/info/rfc2119>.
 [RFC5246]  Dierks, T. and E. Rescorla, "The Transport Layer Security
            (TLS) Protocol Version 1.2", RFC 5246,
            DOI 10.17487/RFC5246, August 2008,
            <https://www.rfc-editor.org/info/rfc5246>.
 [RFC6020]  Bjorklund, M., Ed., "YANG - A Data Modeling Language for
            the Network Configuration Protocol (NETCONF)", RFC 6020,
            DOI 10.17487/RFC6020, October 2010,
            <https://www.rfc-editor.org/info/rfc6020>.
 [RFC6241]  Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
            and A. Bierman, Ed., "Network Configuration Protocol
            (NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011,
            <https://www.rfc-editor.org/info/rfc6241>.
 [RFC6242]  Wasserman, M., "Using the NETCONF Protocol over Secure
            Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011,
            <https://www.rfc-editor.org/info/rfc6242>.

Schoenwaelder & Bajpai Standards Track [Page 48] RFC 8194 YANG Data Model for LMAP August 2017

 [RFC6536]  Bierman, A. and M. Bjorklund, "Network Configuration
            Protocol (NETCONF) Access Control Model", RFC 6536,
            DOI 10.17487/RFC6536, March 2012,
            <https://www.rfc-editor.org/info/rfc6536>.
 [RFC6991]  Schoenwaelder, J., Ed., "Common YANG Data Types",
            RFC 6991, DOI 10.17487/RFC6991, July 2013,
            <https://www.rfc-editor.org/info/rfc6991>.
 [RFC7950]  Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
            RFC 7950, DOI 10.17487/RFC7950, August 2016,
            <https://www.rfc-editor.org/info/rfc7950>.
 [RFC8040]  Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
            Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017,
            <https://www.rfc-editor.org/info/rfc8040>.
 [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
            2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
            May 2017, <https://www.rfc-editor.org/info/rfc8174>.
 [RFC8193]  Burbridge, T., Eardley, P., Bagnulo, M., and J.
            Schoenwaelder, "Information Model for Large-Scale
            Measurement Platforms (LMAPs)", DOI 10.17487/RFC8193,
            RFC 8193, August 2017,
            <http://www.rfc-editor.org/info/rfc8193>.

7.2. Informative References

 [ISO-8601]
            International Organization for Standardization, "Data
            elements and interchange formats -- Information
            interchange -- Representation of dates and times", ISO
            Standard 8601:2004, December 2004.
 [NETCONF-CLIENT-SERVER]
            Watsen, K., Wu, G., and J. Schoenwaelder, "NETCONF Client
            and Server Models", Work in Progress, draft-ietf-netconf-
            netconf-client-server-04, July 2017.
 [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
            DOI 10.17487/RFC3688, January 2004,
            <https://www.rfc-editor.org/info/rfc3688>.
 [RFC5424]  Gerhards, R., "The Syslog Protocol", RFC 5424,
            DOI 10.17487/RFC5424, March 2009,
            <https://www.rfc-editor.org/info/rfc5424>.

Schoenwaelder & Bajpai Standards Track [Page 49] RFC 8194 YANG Data Model for LMAP August 2017

 [RFC7223]  Bjorklund, M., "A YANG Data Model for Interface
            Management", RFC 7223, DOI 10.17487/RFC7223, May 2014,
            <https://www.rfc-editor.org/info/rfc7223>.
 [RFC7317]  Bierman, A. and M. Bjorklund, "A YANG Data Model for
            System Management", RFC 7317, DOI 10.17487/RFC7317, August
            2014, <https://www.rfc-editor.org/info/rfc7317>.
 [RFC7398]  Bagnulo, M., Burbridge, T., Crawford, S., Eardley, P., and
            A. Morton, "A Reference Path and Measurement Points for
            Large-Scale Measurement of Broadband Performance",
            RFC 7398, DOI 10.17487/RFC7398, February 2015,
            <https://www.rfc-editor.org/info/rfc7398>.
 [RFC7594]  Eardley, P., Morton, A., Bagnulo, M., Burbridge, T.,
            Aitken, P., and A. Akhter, "A Framework for Large-Scale
            Measurement of Broadband Performance (LMAP)", RFC 7594,
            DOI 10.17487/RFC7594, September 2015,
            <https://www.rfc-editor.org/info/rfc7594>.
 [W3C.REC-xml-20081126]
            Bray, T., Paoli, J., Sperberg-McQueen, M., Maler, E., and
            F. Yergeau, "Extensible Markup Language (XML) 1.0 (Fifth
            Edition)", World Wide Web Consortium Recommendation REC-
            xml-20081126, November 2008,
            <http://www.w3.org/TR/2008/REC-xml-20081126>.
 [YANG-HARDWARE]
            Bierman, A., Bjorklund, M., Dong, J., and D. Romascanu, "A
            YANG Data Model for Hardware Management", Work in
            Progress, draft-ietf-netmod-entity-03, March 2017.

Schoenwaelder & Bajpai Standards Track [Page 50] RFC 8194 YANG Data Model for LMAP August 2017

Appendix A. Example Parameter Extension Module

 Sometimes Tasks may require complicated parameters that cannot easily
 be fit into options, i.e., a list of name/value pairs.  In such a
 situation, it is possible to augment the ietf-lmap-control.yang and
 ietf-lmap-report.yang data models with definitions for more complex
 parameters.  The following example module demonstrates this idea
 using the parameters of UDP latency metrics as an example (although
 UDP latency metric parameters do not really need such an extension
 module).
module example-ietf-ippm-udp-latency {
  namespace "urn:example:ietf-ippm-udp-latency";
  prefix "ippm-udp-latency";
  import ietf-inet-types {
    prefix inet;
  }
  import ietf-lmap-control {
    prefix "lmapc";
  }
  import ietf-lmap-report {
    prefix "lmapr";
  }
  grouping ippm-udp-latency-parameter-grouping {
    leaf src-ip {
      type inet:ip-address;
      description
        "The source IP address of the UDP measurement traffic.";
    }
    leaf src-port {
      type inet:port-number;
      description
        "The source port number of the UDP measurement traffic.";
    }
    leaf dst-ip {
      type inet:ip-address;
      description
        "The destination IP address of the UDP measurement traffic.";
    }

Schoenwaelder & Bajpai Standards Track [Page 51] RFC 8194 YANG Data Model for LMAP August 2017

    leaf dst-port {
      type inet:port-number;
      description
        "The destination port number of the UDP measurement traffic.";
    }
    leaf poisson-lambda {
      type decimal64 {
        fraction-digits 4;
      }
      units "seconds";
      default 1.0000;
      description
        "The average interval for the poisson stream with a resolution
         of 0.0001 seconds (0.1 ms).";
    }
    leaf poisson-limit {
      type decimal64 {
        fraction-digits 4;
      }
      units "seconds";
      default 30.0000;
      description
        "The upper limit on the poisson distribution with a resolution
         of 0.0001 seconds (0.1 ms).";
    }
  }
  augment "/lmapc:lmap/lmapc:schedules/lmapc:schedule/lmapc:action"
        + "/lmapc:parameters/lmapc:extension" {
    description
      "This augmentation adds parameters specific to IP Performance
        Metrics (IPPM) and UDP latency metrics to Actions.";
    case "ietf-ippm-udp-latency" {
      uses ippm-udp-latency-parameter-grouping;
    }
  }

Schoenwaelder & Bajpai Standards Track [Page 52] RFC 8194 YANG Data Model for LMAP August 2017

  augment "/lmapr:report/lmapr:input/lmapr:result"
        + "/lmapr:parameters/lmapr:extension" {
    description
      "This augmentation adds parameters specific to IPPM and
       UDP latency metrics to reports.";
    case "ietf-ippm-udp-latency" {
      uses ippm-udp-latency-parameter-grouping;
    }
  }
}

Appendix B. Example Configuration

 The configuration below is in XML [W3C.REC-xml-20081126].
 <config xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
   <lmap xmlns="urn:ietf:params:xml:ns:yang:ietf-lmap-control">
     <agent>
       <agent-id>550e8400-e29b-41d4-a716-446655440000</agent-id>
       <report-agent-id>true</report-agent-id>
     </agent>
     <schedules>
       <!-- The Schedule S1 first updates a list of ping targets
            and subsequently sends a ping to all targets. -->
       <schedule>
         <name>S1</name>
         <start>E1</start>
         <execution-mode>sequential</execution-mode>
         <action>
           <name>A1</name>
           <task>update-ping-targets</task>
         </action>
         <action>
           <name>A2</name>
           <task>ping-all-targets</task>
           <destination>S3</destination>
         </action>
         <suppression-tag>measurement:ping</suppression-tag>
       </schedule>
       <!-- The Schedule S2 executes two traceroutes concurrently. -->
       <schedule>
         <name>S2</name>
         <start>E1</start>
         <execution-mode>parallel</execution-mode>

Schoenwaelder & Bajpai Standards Track [Page 53] RFC 8194 YANG Data Model for LMAP August 2017

         <action>
           <name>A1</name>
           <task>traceroute</task>
           <option>
             <id>target</id>
             <name>target</name>
             <value>2001:db8::1</value>
           </option>
           <destination>S3</destination>
         </action>
         <action>
           <name>A2</name>
           <task>traceroute</task>
           <option>
             <id>target</id>
             <name>target</name>
             <value>2001:db8::2</value>
           </option>
           <destination>S3</destination>
         </action>
         <suppression-tag>measurement:traceroute</suppression-tag>
       </schedule>
       <!-- The Schedule S3 sends measurement data to a Collector. -->
       <schedule>
         <name>S3</name>
         <start>E2</start>
         <action>
           <name>A1</name>
           <task>report</task>
           <option>
             <id>collector</id>
             <name>collector</name>
             <value>https://collector.example.com/</value>
           </option>
         </action>
       </schedule>
     </schedules>
     <suppressions>
       <!-- Stop all measurements if we got orphaned. -->
       <suppression>
         <name>orphaned</name>
         <start>controller-lost</start>
         <end>controller-connected</end>
         <match>measurement:*</match>
       </suppression>
     </suppressions>

Schoenwaelder & Bajpai Standards Track [Page 54] RFC 8194 YANG Data Model for LMAP August 2017

     <tasks>
       <!-- configuration of an update-ping-targets task -->
       <task>
         <name>update-ping-targets</name>
         <program>fping-update-targets</program>
       </task>
       <!-- configuration of a ping-all-targets task -->
       <task>
         <name>ping-all-targets</name>
         <program>fping</program>
       </task>
       <!-- configuration of a traceroute task -->
       <task>
         <name>traceroute</name>
         <program>mtr</program>
         <option>
           <id>csv</id>
           <name>--csv</name>
         </option>
       </task>
       <!-- configuration of a reporter task -->
       <task>
         <name>report</name>
         <program>lmap-report</program>
       </task>
       <task>
         <name>ippm-udp-latency-client</name>
         <program>ippm-udp-latency</program>
         <function>
           <uri>urn:example:tbd</uri>
           <role>client</role>
         </function>
         <tag>active</tag>
       </task>
     </tasks>
     <events>
       <!-- The event E1 triggers every hour during September 2016
            with a random spread of one minute. -->
       <event>
         <name>E1</name>
         <random-spread>60</random-spread>   <!-- seconds -->
         <periodic>
           <interval>3600000</interval>
           <start>2016-09-01T00:00:00+00:00</start>
           <end>2016-11-01T00:00:00+00:00</end>
         </periodic>

Schoenwaelder & Bajpai Standards Track [Page 55] RFC 8194 YANG Data Model for LMAP August 2017

       </event>
       <!-- The event E2 triggers on Mondays at 4am UTC -->
       <event>
         <name>E2</name>
         <calendar>
           <month>*</month>
           <day-of-week>monday</day-of-week>
           <day-of-month>*</day-of-month>
           <hour>4</hour>
           <minute>0</minute>
           <second>0</second>
           <timezone-offset>+00:00</timezone-offset>
         </calendar>
       </event>
       <!-- The event controller-lost triggers when we lost
            connectivity with the Controller. -->
       <event>
         <name>controller-lost</name>
         <controller-lost/>
       </event>
       <!-- The event contoller-connected triggers when we
            established or re-established connectivity with
            the Controller. -->
       <event>
         <name>controller-connected</name>
         <controller-connected/>
       </event>
     </events>
   </lmap>
 </config>

Appendix C. Example Report

 The report below is in XML [W3C.REC-xml-20081126].
 <rpc xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"
      message-id="1">
   <report xmlns="urn:ietf:params:xml:ns:yang:ietf-lmap-report">
     <date>2015-10-28T13:27:42+02:00</date>
     <agent-id>550e8400-e29b-41d4-a716-446655440000</agent-id>
     <result>
       <schedule>S1</schedule>
       <action>A1</action>
       <task>update-ping-targets</task>
       <start>2016-03-21T10:48:55+01:00</start>
       <end>2016-03-21T10:48:57+01:00</end>
       <status>0</status>
     </result>

Schoenwaelder & Bajpai Standards Track [Page 56] RFC 8194 YANG Data Model for LMAP August 2017

     <result>
       <schedule>S1</schedule>
       <action>A2</action>
       <task>ping-all-targets</task>
       <start>2016-03-21T10:48:55+01:00</start>
       <end>2016-03-21T10:48:57+01:00</end>
       <status>0</status>
       <table>
         <column>target</column>
         <column>rtt</column>
         <row>
           <value>2001:db8::1</value>
           <value>42</value>
         </row>
         <row>
           <value>2001:db8::2</value>
           <value>24</value>
         </row>
       </table>
     </result>
     <result>
       <schedule>S2</schedule>
       <action>A1</action>
       <task>traceroute</task>
       <option>
         <id>target</id>
         <name>target</name>
         <value>2001:db8::1</value>
       </option>
       <option>
         <id>csv</id>
         <name>--csv</name>
       </option>
       <start>2016-03-21T10:48:55+01:00</start>
       <end>2016-03-21T10:48:57+01:00</end>
       <status>1</status>
       <table>
         <column>hop</column>
         <column>ip</column>
         <column>rtt</column>
         <row>
           <value>1</value>
           <value>2001:638:709:5::1</value>
           <value>10.5</value>
         </row>
         <row>
           <value>2</value>
           <value>?</value>

Schoenwaelder & Bajpai Standards Track [Page 57] RFC 8194 YANG Data Model for LMAP August 2017

           <value></value>
         </row>
       </table>
     </result>
     <result>
       <schedule>S2</schedule>
       <action>A2</action>
       <task>traceroute</task>
       <option>
         <id>target</id>
         <name>target</name>
         <value>2001:db8::2</value>
       </option>
       <option>
         <id>csv</id>
         <name>--csv</name>
       </option>
       <start>2016-03-21T10:48:55+01:00</start>
       <end>2016-03-21T10:48:57+01:00</end>
       <status>1</status>
       <table>
         <column>hop</column>
         <column>ip</column>
         <column>rtt</column>
         <row>
           <value>1</value>
           <value>2001:638:709:5::1</value>
           <value>11.8</value>
         </row>
         <row>
           <value>2</value>
           <value>?</value>
           <value></value>
         </row>
       </table>
     </result>
   </report>
 </rpc>

Schoenwaelder & Bajpai Standards Track [Page 58] RFC 8194 YANG Data Model for LMAP August 2017

Acknowledgements

 Several people contributed to this specification by reviewing early
 draft versions and actively participating in the LMAP Working Group
 (apologies to those unintentionally omitted): Marcelo Bagnulo, Martin
 Bjorklund, Trevor Burbridge, Timothy Carey, Alissa Cooper, Philip
 Eardley, Al Morton, Dan Romascanu, Andrea Soppera, Barbara Stark, and
 Qin Wu.
 Juergen Schoenwaelder and Vaibhav Bajpai worked in part on the Leone
 research project, which received funding from the European Union
 Seventh Framework Programme [FP7/2007-2013] under grant agreement
 number 317647.
 Juergen Schoenwaelder and Vaibhav Bajpai were partly funded by
 Flamingo, a Network of Excellence project (ICT-318488) supported by
 the European Commission under its Seventh Framework Programme.

Authors' Addresses

 Juergen Schoenwaelder
 Jacobs University Bremen
 Email: j.schoenwaelder@jacobs-university.de
 Vaibhav Bajpai
 Technical University of Munich
 Email: bajpaiv@in.tum.de

Schoenwaelder & Bajpai Standards Track [Page 59]

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