[Docs] [txt|pdf] [Tracker] [WG] [Email] [Diff1] [Diff2] [Nits]

Versions: (draft-schoenw-lmap-yang) 00 01 02 03 04 05 06 07 08 09 10 11 12 RFC 8194

Network Working Group                                   J. Schoenwaelder
Internet-Draft                                                 V. Bajpai
Intended status: Standards Track                Jacobs University Bremen
Expires: October 12, 2015                                 April 10, 2015


             A YANG Data Model for LMAP Measurement Agents
                      draft-ietf-lmap-yang-00.txt

Abstract

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

Status of This Memo

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

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

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

   This Internet-Draft will expire on October 12, 2015.

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   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  Expires October 12, 2015                [Page 1]


Internet-Draft               LMAP Data Model                  April 2015


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 . . . . . . . . . . . .   6
   4.  YANG Modules  . . . . . . . . . . . . . . . . . . . . . . . .   7
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  29
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  29
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  30
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  30
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  30
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  30
   Appendix A.  Example Configuration (XML)  . . . . . . . . . . . .  31
   Appendix B.  Example Configuration (JSON) . . . . . . . . . . . .  35
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  40

1.  Introduction

   This document defines a data model for Large-Scale Measurement
   Platforms (LMAP) [I-D.ietf-lmap-framework].  The data model is
   defined using the YANG [RFC6020] data modeling language.  It aims to
   be consistent with the LMAP Information Model
   [I-D.ietf-lmap-information-model].

1.1.  Terminology

   This document uses the LMAP terminology defined in
   [I-D.ietf-lmap-framework].

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

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.

   o  Abbreviations before data node names: "rw" means configuration
      (read-write), and "ro" means state data (read-only).

   o  Symbols after data node names: "?" means an optional node, "!"
      means a presence container, and "*" denotes a list and leaf-list.



Schoenwaelder & Bajpai  Expires October 12, 2015                [Page 2]


Internet-Draft               LMAP Data Model                  April 2015


   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 tree diagram below shows the structure of the configuration
   model.


module: ietf-lmap-control
   +--rw lmap
      +--rw agent
      |  +--rw agent-id?                  yang:uuid
      |  +--rw device-id?                 inet:uri
      |  +--rw credentials?               string
      |  +--rw group-id?                  string
      |  +--rw report-agent-id?           boolean
      |  +--rw controller-lost-timeout?   uint32
      +--rw schedules
      |  +--rw schedule* [name]
      |     +--rw name      string
      |     +--rw action* [name]
      |     |  +--rw name           string
      |     |  +--rw task           -> /lmap/tasks/task/name
      |     |  +--rw option* [name]
      |     |  |  +--rw name     string
      |     |  |  +--rw value?   string
      |     |  +--rw destination* [name]
      |     |     +--rw name        string
      |     |     +--rw output*     uint16
      |     |     +--rw schedule    -> /lmap/schedules/schedule/name
      |     |     +--rw action      -> /lmap/schedules/schedule[name = current()/../schedule]/action/name
      |     +--rw timing    -> /lmap/timings/timing/name
      +--rw suppression
      |  +--rw enabled?        boolean
      |  +--rw stop-running?   boolean
      |  +--rw start?          yang:date-and-time
      |  +--rw end?            yang:date-and-time
      |  +--rw task*           -> /lmap/tasks/task/name
      |  +--rw schedule*       -> /lmap/schedules/schedule/name
      +--rw channels
      |  +--rw channel* [name]
      |     +--rw name           string
      |     +--rw target?        inet:uri
      |     +--rw credentials?   string



Schoenwaelder & Bajpai  Expires October 12, 2015                [Page 3]


Internet-Draft               LMAP Data Model                  April 2015


      |     +--rw interface?     -> /if:interfaces/interface/name
      +--rw tasks
      |  +--rw task* [name]
      |     +--rw name                   string
      |     +--rw (task-identification)
      |     |  +--:(registry)
      |     |  |  +--rw registry?              inet:uri
      |     |  +--:(program)
      |     |     +--rw program?               string
      |     +--rw option* [name]
      |     |  +--rw name     string
      |     |  +--rw value?   string
      |     +--rw tag*                   string
      |     +--rw suppress-by-default?   boolean
      +--rw timings
         +--rw timing* [name]
            +--rw name             string
            +--rw (timing-type)?
            |  +--:(periodic)
            |  |  +--rw periodic
            |  |     +--rw interval    uint32
            |  |     +--rw start?      yang:date-and-time
            |  |     +--rw end?        yang:date-and-time
            |  +--:(calendar)
            |  |  +--rw calendar
            |  |     +--rw month*             union
            |  |     +--rw weekday*           union
            |  |     +--rw day-of-month*      union
            |  |     +--rw hour*              union
            |  |     +--rw minute*            union
            |  |     +--rw second*            union
            |  |     +--rw timezone-offset?   timezone-offset
            |  |     +--rw start?             yang:date-and-time
            |  |     +--rw end?               yang:date-and-time
            |  +--:(one-off)
            |  |  +--rw one-off-time     yang:date-and-time
            |  +--:(immediate)
            |  |  +--rw immediate        empty
            |  +--:(startup)
            |     +--rw startup          empty
            +--rw random-spread?   int32


   The tree diagram below shows the structure of the state model.







Schoenwaelder & Bajpai  Expires October 12, 2015                [Page 4]


Internet-Draft               LMAP Data Model                  April 2015


   module: ietf-lmap-control
      +--ro lmap-state
         +--ro agent
         |  +--ro agent-id        yang:uuid
         |  +--ro device-id       inet:uri
         |  +--ro hardware        string
         |  +--ro firmware        string
         |  +--ro version         string
         |  +--ro last-started    yang:date-and-time
         +--ro tasks
            +--ro task* [name]
               +--ro name                      string
               +--ro (task-identification)
               |  +--:(registry)
               |  |  +--ro registry?                 inet:uri
               |  +--:(program)
               |     +--ro program?                  string
               +--ro last-completion?          yang:date-and-time
               +--ro last-status?              status-code
               +--ro last-message?             string
               +--ro last-failed-completion?   yang:date-and-time
               +--ro last-failed-status?       status-code
               +--ro last-failed-message?      string


   The tree diagram below shows the structure of the notification
   (reporting) model.
























Schoenwaelder & Bajpai  Expires October 12, 2015                [Page 5]


Internet-Draft               LMAP Data Model                  April 2015


   module: ietf-lmap-report
   notifications:
      +---n report
         +--ro date        yang:date-and-time
         +--ro agent-id?   yang:uuid
         +--ro group-id?   string
         +--ro task* [name]
         |  +--ro name                   string
         |  +--ro (task-identification)
         |  |  +--:(registry)
         |  |  |  +--ro registry?              inet:uri
         |  |  +--:(program)
         |  |     +--ro program?               string
         |  +--ro option* [name]
         |  |  +--ro name     string
         |  |  +--ro value?   string
         |  +--ro tag*                   string
         |  +--ro suppress-by-default?   boolean
         +--ro header
         |  +--ro column*   string
         +--ro row*
            +--ro start       yang:date-and-time
            +--ro end?        yang:date-and-time
            +--ro conflict*   string
            +--ro value*      string


3.  Relationship to the Information Model

   The LMAP information model [I-D.ietf-lmap-information-model] is
   devided into six sections.  They are mapped into the YANG data model
   as explained below:

   o  Pre-Configuration Information: This is not modeled explicitly
      since it is a subset of the configuration information.

   o  Configuration Information: This is modeled in the /lmap/agent
      subtree and the /lmap/schedules, /lmap/tasks, and /lmap/channels
      subtrees 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/suppression
      subtree and the /lmap/schedules, /lmap/tasks, and /lmap/channels
      subtrees 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



Schoenwaelder & Bajpai  Expires October 12, 2015                [Page 6]


Internet-Draft               LMAP Data Model                  April 2015


      protocol used to manipulate the lmap specific configuration.
      [[CREF1: It needs to be discussed whether we can rely on informal
      syslog messages that can be accessed via protocols such RFC 5277
      or whether we want to define specific notifications in the YANG
      data model. --JS]]

   o  Capability and Status Information: Some of the status information
      is modeled in the /lmap-state/agent subtree.  Information about
      network interfaces can be obtained from the interfaces YANG data
      model [RFC7223].  The list of supported tasks is modeled in the
      /lmap-state/tasks subtree including information about the last
      execution and the last failed execution.

   o  Reporting Information: This is modeled by the report notification.

   These six sections are build on the following common information
   objects:

   o  Schedules: This is modeled in the /lmap/schedules subtree.

   o  Channels: This is modeled in the /lmap/channels subtree.

   o  Task Configurations: This is modeled in the /lmap/tasks subtree.

   o  Timing Information: This is modeled in the /lmap/timings subtree.

4.  YANG Modules

   The modules import definitions from [RFC6991] and [RFC7223].


   <CODE BEGINS> file "ietf-lmap-control@2015-04-10.yang"
   module ietf-lmap-control {

     namespace "urn:ietf:params:xml:ns:yang:ietf-lmap-control";
     prefix "lmapc";

     import ietf-yang-types {
       prefix yang;
     }
     import ietf-inet-types {
       prefix inet;
     }
     import ietf-interfaces {
       prefix if;
     }

     organization



Schoenwaelder & Bajpai  Expires October 12, 2015                [Page 7]


Internet-Draft               LMAP Data Model                  April 2015


       "IETF Large-Scale Measurement Platforms Working Group";

     contact
       "WG Web:   <http://tools.ietf.org/wg/lmap/>
        WG List:  <mailto:lmap@ietf.org>

        Editor:   Juergen Schoenwaelder
                  <j.schoenwaelder@jacobs-university.de>

        Editor:   Vaibhav Bajpai
                  <v.bajpai@jacobs-university.de>";

     description
       "This module defines a data model for controlling measurement
        agents that are part of a Large-Scale Measurement Platform
        (LMAP).";

     revision "2015-04-10" {
       description
        "Initial version";
       reference
        "RFC XXX: A YANG Data Model for LMAP Measurement Agents";
     }

     /*
      * Typedefs
      */

     typedef weekday {
       type enumeration {
         enum sunday {
           value 0;
           description "Sunday of the week";
         }
         enum monday {
           value 1;
           description "Monday of the week";
         }
         enum tuesday {
           value 2;
           description "Tuesday of the week";
         }
         enum wednesday {
           value 3;
           description "Wednesday of the week";
         }
         enum thursday {
           value 4;



Schoenwaelder & Bajpai  Expires October 12, 2015                [Page 8]


Internet-Draft               LMAP Data Model                  April 2015


           description "Thursday of the week";
         }
         enum friday {
           value 5;
           description "Friday of the week";
         }
         enum saturday {
           value 6;
           description "Saturday of the week";
         }
       }
       description
        "A type modeling the weekdays in the Greco-Roman
         tradition.";
     }

     typedef month {
       type enumeration {
         enum january {
           value 1;
           description "January of the Julian and Gregorian calendar";
         }
         enum february {
           value 2;
           description "February of the Julian and Gregorian calendar";
         }
         enum march {
           value 3;
           description "March of the Julian and Gregorian calendar";
         }
         enum april {
           value 4;
           description "April of the Julian and Gregorian calendar";
         }
         enum may {
           value 5;
           description "May of the Julian and Gregorian calendar";
         }
         enum june {
           value 6;
           description "June of the Julian and Gregorian calendar";
         }
         enum july {
           value 7;
           description "July of the Julian and Gregorian calendar";
         }
         enum august {
           value 8;



Schoenwaelder & Bajpai  Expires October 12, 2015                [Page 9]


Internet-Draft               LMAP Data Model                  April 2015


           description "August of the Julian and Gregorian calendar";
         }
         enum september {
           value 9;
           description "September of the Julian and Gregorian calendar";
         }
         enum october {
           value 10;
           description "October of the Julian and Gregorian calendar";
         }
         enum november {
           value 11;
           description "November of the Julian and Gregorian calendar";
         }
         enum december {
           value 12;
           description "December of the Julian and Gregorian calendar";
         }
       }
       description
         "A type modeling the month in the Julian and Gregorian
          tradition.";
     }

     typedef wildcard {
       type string { pattern '\*'; }
       description
         "A wildcard for calendar scheduling entries.";
     }

     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. By convention,
          0 indicates successful termination.";
     }

     typedef timezone-offset {
       type string {
         pattern 'Z|[\+\-]\d{2}:\d{2}';
       }
       description
         "A timezone-offset as it is use in the yang:date-and-time
          type. The value Z is equivalent to +00:00. The value -00:00
          indicates and unknown time-offset.";
     }



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 10]


Internet-Draft               LMAP Data Model                  April 2015


     /*
      * Groupings
      */

     grouping timing-start-end-grouping {
       description
         "A grouping that provides start and end times for
          timing objects.";
       leaf start {
         type yang:date-and-time;
         description
           "The date and time when the timing object
            starts to create triggers.";
       }
       leaf end {
         type yang:date-and-time;
         description
           "The date and time when the timing object
            stops to create triggers.

            It is generally a good idea to always configure
            an end time and to refresh the configuration
            of timing object as needed to ensure that agents
            that loose connectivity to their controller
            do not continue their tasks forever.";
       }
     }

     grouping task-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 "name";
         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.";

         // XXX This is kind of broken since making the option name
         // XXX a key means that a certain option may only appear once.
         // XXX This is not workable since some tests require a list of
         // XXX targets. Turning this into a leaf-list of args also
         // XXX does not work since YANG requires leaf-list values to



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 11]


Internet-Draft               LMAP Data Model                  April 2015


         // XXX be unique. Oops.

         leaf name {
           type string;
           description
             "The name of the option.";
         }

         leaf value {
           type string;
           description
             "The value of the option.";
         }
       }
     }

     grouping task-grouping {
       description
         "A grouping that defines the configuration of a task.";

       list task {
         key name;
         description
           "The list of tasks configured on the LMAP agent.";

         leaf name {
           type string;
           description
             "The unique name of a task.";
         }

         choice task-identification {
           mandatory true;
           description
             "Information that identifies the task.";

           leaf registry {
             type inet:uri;
             description
               "The registry entry identifying the configured task.";
           }

           leaf program {
             type string;
             description
               "The (local) program to invoke in order to execute
                  the task.";
           }



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 12]


Internet-Draft               LMAP Data Model                  April 2015


         }

         uses task-options-grouping {
           description
             "The list of task specific options.";
         }

         leaf-list tag {
           type string;
           description
             "A tag contains additional information that is passed
              with the result record to the collector. A tag can be
              used to carry the Measurement Cycle ID.";
         }

         leaf suppress-by-default {
           type boolean;
           default true;
           description
             "Indicates whether the task will be suppressed by
              a default supression.";
         }
       }
     }

     /*
      * Configuration data nodes
      */

     container lmap {
       description
         "Configuration of the LMAP agent.";

       /*
        * Common Information Objects: 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



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 13]


Internet-Draft               LMAP Data Model                  April 2015


              sensitive and hence this object is optional.";
         }

         leaf device-id {
           type inet:uri;
           description
             "The device-id identifies a property of the
              device running the measurement agent. In certain
              deployments, the device-id may be considered
              sensitive and hence this object is optional.";
         }

         leaf credentials {
           type string;
           description
             "The credentials of the agent.";
           // XXX: This is way too simplistic. Credentials are
           //      specific to the authentication mechanism used
           //      by a protocol. Hence, this needs to be a far
           //      more complex and extensible choice or it might
           //      not be needed since the protocol data models
           //      already cover it.
         }

         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 report-agent-id {
           type boolean;
           default false;
           // XXX: write a must expression that requires
           // group-id to be configured when this is true?
           description
             "The 'report-agent-id' controls whether the
              'agent-id' is reported to collectors if the
              'group-id' is configured. If the 'group-id'
              is not configured, the agent-id is always
              reported.";
         }

         leaf controller-lost-timeout {
           type uint32;



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 14]


Internet-Draft               LMAP Data Model                  April 2015


           units "";
           description
             "A timer is started after each successful contact
              with a controller. When the timer reaches the
              controller-lost-timeout, all schedules will be
              disabled.";
         }
       }

       /*
        * Common Information Objects: Schedules
        */

       container schedules {
         description
           "Configuration of LMAP schedules. Schedules control with
            tasks are executed by the LMAP implementation.";

         list schedule {
           key name;
           description
             "Configuration of a particular schedule.";

           leaf name {
             type string;
             description
               "The locally-unique, administratively assigned name for
                this scheduled task.";
           }

           list action {
             key name;
             description
               "An action describes a task that is invoked by the
                schedule. Multiple actions are invoked sequentially.";

             leaf name {
               type string;
               description
                 "The unique identifier for this action.";
             }

             leaf task {
               type leafref {
                 path "/lmap/tasks/task/name";
               }
               mandatory true;
               description



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 15]


Internet-Draft               LMAP Data Model                  April 2015


                 "The tasks invoked by this action.";
             }

             uses task-options-grouping {
               description
                 "The list of action specific options that are
                  appended to the list of task specific options.";
             }

             list destination {
               key "name";
               description
                 "A destination receives information from the task
                  associated with this action. A queue is internally
                  used to pass the information to another (scheduled)
                  action.";

               leaf name {
                 type string;
                 description
                   "The name of this destination (queue) that passes
                    information to another (scheduled) action.";
               }

               leaf-list output {
                 type uint16;
                 description
                   "The list of outputs of a task directed to another
                    (scheduled) action. If no output is specified,
                    then all output is directed to another (scheduled)
                    action.";
               }

               leaf schedule {
                 type leafref {
                   path "/lmap/schedules/schedule/name";
                 }
                 mandatory true;
                 description
                   "The schedule of the (scheduled) action receiving
                    the output.";
               }

               leaf action {
                 type leafref {
                   path "/lmap/schedules/schedule"
                      + "[name = current()/../schedule]"
                      + "/action/name";



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 16]


Internet-Draft               LMAP Data Model                  April 2015


                 }
                 mandatory true;
                 description
                   "The (scheduled) action receiving the output (the
                    destination consuming the data from the queue).";
               }
             }
           }

           leaf timing {
             type leafref {
               path "/lmap/timings/timing/name";
             }
             mandatory true;
             description
               "The timing source controlling the start of the scheduled
                tasks.";
           }
         }
       }

       /*
        * Suppression
        */

       container suppression {
         description
           "Suppression information to prevent schedules to start
            certain tasks.";

         leaf enabled {
           type boolean;
           default false;
           description
             "Setting 'enabled' to true will suppress all tasks for
              which suppress-by-default is true.";
         }

         leaf stop-running {
           type boolean;
           default false;
           description
             "Setting 'stop-running' to true will cause running
              tasks to be terminated if suppression is enabled
              (the 'enabled' leaf is set to true). Otherwise,
              running tasks will not be affected if suppression
              is enabled.";
         }



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 17]


Internet-Draft               LMAP Data Model                  April 2015


         leaf start {
           type yang:date-and-time;
           description
             "The date and time when supression starts to
              become effective. If not present, supression
              becomes effective immeditately when 'enabled'
              is set to true.";
         }

         leaf end {
           type yang:date-and-time;
           description
             "The date and time when supression stops to
              be effective. If not present, supression
              continues indefinite until 'enabled' is set
              to false.";
         }

         leaf-list task {
           type leafref {
             path "/lmap/tasks/task/name";
           }
           description
             "A specific task to suppress. If no tasks are
              listed, then all tasks will be suppressed.";
         }

         leaf-list schedule {
           type leafref {
             path "/lmap/schedules/schedule/name";
           }
           description
             "A specific schedule to suppress. If no schedules
              are listed, then all schedules will be suppressed.";
         }

       }

       /*
        * Common Information Objects: Channels
        */

       container channels {
         description
           "A channel describes properties of an LMAP control or
            reporting channel.";

         list channel {



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 18]


Internet-Draft               LMAP Data Model                  April 2015


           key name;
           description
             "The list of channels configured on the LMAP agent.";

           leaf name {
             type string;
             description
               "The unique name of a channel.";
           }

           leaf target {
             type inet:uri;
             description
               "The remote endpoint of the channel.";
           }

           leaf credentials {
             type string;
             description
               "The credentials of the channel.";
             // XXX: This is way too simplistic. Credentials are
             //      specific to the authentication mechanism used
             //      by a protocol. Hence, this needs to be a far
             //      more complex and extensible choice.
           }

           leaf interface {
             type leafref {
               path "/if:interfaces/if:interface/if:name";
             }
             description
               "The local interface used to reach the remote
                endpoint of the channel. If not present, the
                system will select a suitable interface.";
           }
         }
       }

       /*
        * Common Information Objects: Task Configurations
        */

       container tasks {
         description
           "Configuration of LMAP tasks.";

         uses task-grouping;
       }



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 19]


Internet-Draft               LMAP Data Model                  April 2015


       /*
        * Common Information Objects: Timing Information
        */

       container timings {
         description
           "Configuration of LMAP timings.

            Implementations may be forced to delay acting
            upon triggers in the face of local constraints.
            A task triggered therefore not rely on the accuracy
            provided by the scheduler implementation.";

         list timing {
           key name;
           description
             "The list of timings configured on the LMAP agent.";

           leaf name {
             type string;
             description
               "The unique name of a timing.";
           }

           choice timing-type {
             description
               "Different types of timing objects are handled by
                different branches of this choices.";

             case periodic {
               container periodic {
                 description
                   "A periodic timing object triggers periodically
                    driven by a regular interval.";

                 leaf interval {
                   type uint32;
                   units "milliseconds";
                   mandatory true;
                   description
                     "The number of milliseconds between two triggers
                       generated by this periodic timing object.

                       The execution system must not generate triggers
                       for periodic timing objects that have a interval
                       value of 0. A timing object with an interval of
                       0 milliseconds will therefore never trigger.";
                 }



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 20]


Internet-Draft               LMAP Data Model                  April 2015


                 uses timing-start-end-grouping;
               }
             }

             case calendar {
               container calendar {
                 description
                   "A calendar timing object trigger based on the
                    current calendar date and time.";

                 leaf-list month {
                   type union {
                     type month;
                     type wildcard;
                   }
                   description
                     "A month at which this calendar timing will
                      trigger. The wildcard means all months.";
                 }

                 leaf-list weekday {
                   type union {
                     type weekday;
                     type wildcard;
                   }
                   description
                     "A weekday at which this calendar timing will
                      trigger. The wildcard means all weekdays.";
                 }

                 leaf-list day-of-month {
                   type union {
                     type int8 { range "-31..-1 | 1..31"; }
                     type wildcard;
                   }
                   description
                     "A day in the month at which this calendar
                      timing will trigger. Negative numbers indicate
                      days counted backwards from the end of the
                      months. The wildcard means all days of a month.";
                 }

                 leaf-list hour {
                   type union {
                     type int8 { range "0..23"; }
                     type wildcard;
                   }
                   description



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 21]


Internet-Draft               LMAP Data Model                  April 2015


                     "An hour at which this calendar timing will
                      trigger. The wildcard means all hours of a day.";
                 }

                 leaf-list minute {
                   type union {
                     type int8 { range "0..59"; }
                     type wildcard;
                   }
                   description
                     "A minute at which this calendar timing will
                      trigger. The wildcard means all minutes of
                      an hour.";
                 }

                 leaf-list second {
                   type union {
                     type int8 { range "0..59"; }
                     type wildcard;
                   }
                   description
                     "A second at which this calendar timing will
                      trigger. The wildcard means all seconds of
                      a minute.";
                 }

                 leaf timezone-offset {
                   type timezone-offset;
                   description
                     "The timezone in which this calendar timing
                      object will be evaluated.";
                 }
                 uses timing-start-end-grouping;
               }
             }

             case one-off {
               leaf one-off-time {
                 type yang:date-and-time;
                 mandatory true;
                 description
                   "This one-off timing object triggers once at the
                    configured one-off-time.";
               }
             }

             case immediate {
               leaf immediate {



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 22]


Internet-Draft               LMAP Data Model                  April 2015


                 type empty;
                 mandatory true;
                 description
                   "This immediate timing object triggers immediately
                    when it is configured.";
               }
             }

             case startup {
               leaf startup {
                 type empty;
                 mandatory true;
                 description
                   "This startup timing object triggers whenever the
                    LMAP agent (re)starts.";
               }
             }
           }

           leaf random-spread {
             type int32;
             units milliseconds;
             description
               "This optional leaf adds a random spread to the
                computation of the trigger.";
           }
         }
       }
     }

     /*
      * The state subtree provides information about the capabilities
      * and the current status of the MA.
      */

     container lmap-state {
       config false;
       description
         "A tree exporting state information about the LMAP agent.";

       container agent {
         description
           "Operations state of the measurement agent.";

         leaf agent-id {
           type yang:uuid;
           mandatory true;
           description



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 23]


Internet-Draft               LMAP Data Model                  April 2015


             "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 device-id {
           type inet:uri;
           mandatory true;
           description
             "The device-id identifies a property of the
              device running the measurement agent. In certain
              deployments, the device-id may be considered
              sensitive and hence this object is optional.";
         }
         leaf hardware {
           type string;
           mandatory true;
           description
             "A short description of the hardware the measurement
              agent is running on. This should include the version
              number of the hardware";
         }
         leaf firmware {
           type string;
           mandatory true;
           description
             "A short description of the firmware the measurement
              agent is running on. This should include the version
              number of the firmware.";
         }
         leaf version {
           type string;
           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 last-started {
           type yang:date-and-time;
       mandatory true;
       description
         "The date and time the measurement agent last started.";
         }
       }

       container tasks {



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 24]


Internet-Draft               LMAP Data Model                  April 2015


         description
           "Available LMAP tasks, including information about their
            last execution and their last failed execution.";

         list task {
           key name;
           description
             "The list of tasks available on the LMAP agent.";

           leaf name {
             type string;
             description
               "The unique name of a task.";
           }

           choice task-identification {
             mandatory true;
             description
               "Information that identifies the task.";

             leaf registry {
               type inet:uri;
               description
                 "The registry entry identifying the configured task.";
             }

             leaf program {
               type string;
               description
                 "The (local) program to invoke in order to execute
                the task.";
             }
           }

           leaf last-completion {
             type yang:date-and-time;
             description
               "The date and time of the last completion of this task.";
           }

           leaf last-status {
             type status-code;
             description
               "The status code returned by the last execution of
                this task.";
           }

           leaf last-message {



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 25]


Internet-Draft               LMAP Data Model                  April 2015


             type string;
             description
               "The status message produced by the last execution
                of this task.";
           }

           leaf last-failed-completion {
             type yang:date-and-time;
             description
               "The date and time of the last failed invocation
                of this task.";
           }

           leaf last-failed-status {
             type status-code;
             description
               "The status code returned by the last failed execution
                of this task. ";
           }

           leaf last-failed-message {
             type string;
             description
               "The status message produced by the last failed
                execution of this task.";
           }
         }
       }
     }
   }
   <CODE ENDS>



   <CODE BEGINS> file "ietf-lmap-report@2015-04-10.yang"
   module ietf-lmap-report {

     namespace "urn:ietf:params:xml:ns:yang:ietf-lmap-report";
     prefix "lmapr";

     import ietf-yang-types {
       prefix yang;
     }
     import ietf-lmap-control {
       prefix lmapc;
     }

     organization



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 26]


Internet-Draft               LMAP Data Model                  April 2015


       "IETF Large-Scale Measurement Platforms Working Group";

     contact
       "WG Web:   <http://tools.ietf.org/wg/lmap/>
        WG List:  <mailto:lmap@ietf.org>

        Editor:   Juergen Schoenwaelder
                  <j.schoenwaelder@jacobs-university.de>

        Editor:   Vaibhav Bajpai
                  <v.bajpai@jacobs-university.de>";

     description
       "This module defines a data model for reporting results from
        measurement agents that are part of a Large-Scale Measurement
        Platform (LMAP).";

     revision "2015-04-10" {
       description
        "Initial version";
       reference
        "RFC XXX: A YANG Data Model for LMAP Measurement Agents";
     }

     notification report {
       description
         "The result record produced by a certain task.";

       leaf date {
         type yang:date-and-time;
         mandatory true;
         description
           "The date and time when this report was sent.";
         // XXX It is unclear why this is useful. The receiver can
         // XXX easily timestamp when data was received.
       }

       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



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 27]


Internet-Draft               LMAP Data Model                  April 2015


            report originates.";
       }

       uses lmapc:task-grouping;
       // XXX We would prefer to just send a configuration version
       // XXX number such that the configuration can be identified
       // XXX that was active XXX when the report was generated. It
       // XXX would be nice to have a generic configuration version
       // XXX number that we could reuse. If this works out, we can
       // XXX inline the grouping as well.

       // XXX Note that task-grouping contains stuff that is not
       // XXX relevant here, perhaps using a grouping is not helpful
       // XXX here. It is also missing stuff, such as the options
       // XXX in the schedule entry.

       container header {
         description
           "The header of the result records.";

         leaf-list column {
           type string;
           description
             "A header of a column in the result rows.";
         }
       }

       list row {
         description
           "The rows of the result record.";

         leaf start {
           type yang:date-and-time;
           mandatory true;
           description
             "The date and time when the measurement producing
              this result row started.";
         }

         leaf end {
           type yang:date-and-time;
           description
             "The date and time when the measurement producing
              this result row stopped.";
         }

         leaf-list conflict {
           type string;



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 28]


Internet-Draft               LMAP Data Model                  April 2015


           description
             "The name of a task overlapping with the execution
              of the task that has produced this result record.";
         }

         leaf-list value {
           type string;
           description
             "The value of a cell in the result.";
           // XXX We could make this a union / choice in order to a
           // XXX more compact encoding of numbers in certain encodings
           // XXX (e.g. JSON)
         }
       }
     }
   }
   <CODE ENDS>


5.  Security Considerations

   TBD

6.  IANA Considerations

   This document registers a URI 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-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.


   This document registers a YANG module in the "YANG Module Names"
   registry [RFC6020].










Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 29]


Internet-Draft               LMAP Data Model                  April 2015


         name: ietf-lmap-control
         namespace: urn:ietf:params:xml:ns:yang:ietf-lmap-control
         prefix: lmapc
         reference: RFC XXXX

         name: ietf-lmap-report
         namespace: urn:ietf:params:xml:ns:yang:ietf-lmap-report
         prefix: lmapr
         reference: RFC XXXX


7.  Acknowledgements

   Juergen Schoenwaelder and Vaibhav Bajpai work in part on the Leone
   research project, which receives funding from the European Union
   Seventh Framework Programme [FP7/2007-2013] under grant agreement
   number 317647.

8.  References

8.1.  Normative References

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

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

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

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

8.2.  Informative References

   [I-D.ietf-lmap-framework]
              Eardley, P., Morton, A., Bagnulo, M., Burbridge, T.,
              Aitken, P., and A. Akhter, "A framework for Large-Scale
              Measurement of Broadband Performance (LMAP)", draft-ietf-
              lmap-framework-12 (work in progress), March 2015.

   [I-D.ietf-lmap-information-model]
              Burbridge, T., Eardley, P., Bagnulo, M., and J.
              Schoenwaelder, "Information Model for Large-Scale
              Measurement Platforms (LMAP)", draft-ietf-lmap-
              information-model-05 (work in progress), April 2015.



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 30]


Internet-Draft               LMAP Data Model                  April 2015


   [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
              January 2004.

Appendix A.  Example Configuration (XML)


<data 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>
      <device-id>urn:dev:mac:0024befffe804ff1</device-id>
      <group-id>wireless measurement at the north-pole</group-id>
      <report-agent-id>true</report-agent-id>
    </agent>

    <schedules>
      <schedule>
        <name>weekdays-hourly</name>
        <action>
          <name>udp-latency-weekdays-hourly</name>
          <task>udp-latency-measurement</task>
          <destination>
            <name>q-all</name>
            <schedule>daily</schedule>
            <action>report-daily</action>
          </destination>
        </action>
        <timing>hourly</timing>
      </schedule>

      <schedule>
        <name>hourly</name>
        <action>
          <name>icmp-latency-hourly</name>
          <task>icmp-latency-measurement</task>
          <destination>
            <name>q-all</name>
            <schedule>daily</schedule>
            <action>report-daily</action>
          </destination>
        </action>
        <timing>hourly</timing>
      </schedule>

      <schedule>
        <name>daily</name>
        <action>



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 31]


Internet-Draft               LMAP Data Model                  April 2015


          <name>report-daily</name>
          <task>lmap-reporting-task</task>
          <option>
            <name>channel</name>
            <value>default-collector-channel</value>
          </option>
        </action>
        <timing>daily</timing>
      </schedule>

      <schedule>
        <name>immediate</name>
        <action>
          <name>icmp-latency-immediate</name>
          <task>icmp-latency-measurement</task>
          <destination>
            <name>q-all</name>
            <schedule>immediate</schedule>
            <action>report-immediate</action>
          </destination>
        </action>
        <action>
          <name>report-immediate</name>
          <task>lmap-reporting-task</task>
          <option>
            <name>channel</name>
            <value>default-collector-channel</value>
          </option>
        </action>
        <timing>immediate</timing>
        <!-- for how long does this task stick around? -->
      </schedule>
    </schedules>

    <suppression>
      <enabled>true</enabled>
      <start>2014-09-02T14:06:11+02:00</start>
      <task>iperf-server</task>
      <schedule>hourly</schedule>
      <schedule>weekdays-hourly</schedule>
    </suppression>

    <channels>
      <channel>
        <name>default-collector-channel</name>
      </channel>
    </channels>




Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 32]


Internet-Draft               LMAP Data Model                  April 2015


    <tasks>
      <task>
        <name>udp-latency-measurement</name>
        <registry>urn:....</registry>
      </task>
      <task>
        <name>icmp-latency-measurement</name>
        <registry>urn:....</registry>
      </task>
      <task>
        <name>iperf-server</name>
        <program>iperf</program>
        <option>
          <name>role</name>
          <value>server</value>
        </option>
        <suppress-by-default>false</suppress-by-default>
      </task>
      <task>
        <name>lmap-reporting-task</name>
        <program>lmap-reportd</program>
      </task>
    </tasks>

    <timings>
      <timing>
        <name>hourly</name>
        <periodic>
          <interval>3600000</interval>
          <start>2014-09-01T17:44:00+02:00</start>
          <end>2014-09-30T00:00:00+02:00</end>
        </periodic>
      </timing>
      <timing>
        <name>daily</name>
        <calendar>
          <hour>04</hour>
        </calendar>
      </timing>
      <timing>
        <name>tuesday-thursday-sunday</name>
        <calendar>
          <weekday>tuesday</weekday>
          <weekday>thursday</weekday>
          <weekday>sunday</weekday>
          <hour>18</hour>
          <minute>04</minute>
          <second>42</second>



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 33]


Internet-Draft               LMAP Data Model                  April 2015


          <end>2014-09-30T00:00:00+02:00</end>
        </calendar>
      </timing>
      <timing>
        <name>once-every-six-hours</name>
        <calendar>
          <hour>0</hour>
          <hour>6</hour>
          <hour>12</hour>
          <hour>18</hour>
          <minute>0</minute>
          <second>0</second>
          <end>2014-09-30T00:00:00+02:00</end>
        </calendar>
        <random-spread>21600000</random-spread>
      </timing>
      <timing>
        <name>immediate</name>
        <immediate/>
      </timing>
      <timing>
        <name>startup</name>
        <startup/>
        <random-spread>12345</random-spread>
      </timing>
    </timings>

  </lmap>

  <lmap-state xmlns="urn:ietf:params:xml:ns:yang:ietf-lmap-control">

    <agent>
      <agent-id>550e8400-e29b-41d4-a716-446655440000</agent-id>
      <device-id>urn:dev:mac:0024befffe804ff1</device-id>
      <hardware>ACME home router</hardware>
      <firmware>OpenWrt version 10.03.1</firmware>
      <version>Measurement Agent Daemon (MAD) 4.2</version>
      <last-started>2015-04-10T17:24:42+02:00</last-started>
    </agent>

    <tasks>
      <task>
        <name>udp-latency-measurement</name>
        <registry>urn:....</registry>
      </task>

      <task>
        <name>icmp-latency-measurement</name>



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 34]


Internet-Draft               LMAP Data Model                  April 2015


        <registry>urn:....</registry>
      </task>

      <task>
        <name>iperf</name>
        <program>iperf</program>
      </task>

      <task>
        <name>lmap-reporting-task</name>
        <program>lmap-reportd</program>
        <last-completion>2015-01-23T12:00:00+01:00</last-completion>
        <last-status>0</last-status>
        <last-message>OK</last-message>
        <last-failed-completion>2015-01-23T03:00:00+01:00</last-failed-completion>
        <last-failed-status>42</last-failed-status>
        <last-failed-message>connection timed out</last-failed-message>
      </task>
    </tasks>

  </lmap-state>
</data>


Appendix B.  Example Configuration (JSON)


   {
     "ietf-lmap-control:lmap": {
       "agent": {
         "agent-id": "550e8400-e29b-41d4-a716-446655440000",
         "device-id": "urn:dev:mac:0024befffe804ff1",
         "group-id": "wireless measurement at the north-pole",
         "report-agent-id": true
       },
       "schedules": {
         "schedule": [
           {
             "name": "weekdays-hourly",
             "action": [
               {
                 "name": "udp-latency-weekdays-hourly",
                 "task": "udp-latency-measurement",
                 "destination": [
                   {
                     "name": "q-all",
                     "schedule": "daily",
                     "action": "report-daily"



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 35]


Internet-Draft               LMAP Data Model                  April 2015


                   }
                 ]
               }
             ],
             "timing": "hourly"
           },
           {
             "name": "hourly",
             "action": [
               {
                 "name": "icmp-latency-hourly",
                 "task": "icmp-latency-measurement",
                 "destination": [
                   {
                     "name": "q-all",
                     "schedule": "daily",
                     "action": "report-daily"
                   }
                 ]
               }
             ],
             "timing": "hourly"
           },
           {
             "name": "daily",
             "action": [
               {
                 "name": "report-daily",
                 "task": "lmap-reporting-task",
                 "option": [
                   {
                     "name": "channel",
                     "value": "default-collector-channel"
                   }
                 ]
               }
             ],
             "timing": "daily"
           },
           {
             "name": "immediate",
             "action": [
               {
                 "name": "icmp-latency-immediate",
                 "task": "icmp-latency-measurement",
                 "destination": [
                   {
                     "name": "q-all",



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 36]


Internet-Draft               LMAP Data Model                  April 2015


                     "schedule": "immediate",
                     "action": "report-immediate"
                   }
                 ]
               },
               {
                 "name": "report-immediate",
                 "task": "lmap-reporting-task",
                 "option": [
                   {
                     "name": "channel",
                     "value": "default-collector-channel"
                   }
                 ]
               }
             ],
             "timing": "immediate"
           }
         ]
       },
       "suppression": {
         "enabled": true,
         "start": "2014-09-02T14:06:11+02:00",
         "task": [
           "iperf-server"
         ],
         "schedule": [
           "hourly",
           "weekdays-hourly"
         ]
       },
       "channels": {
         "channel": [
           {
             "name": "default-collector-channel"
           }
         ]
       },
       "tasks": {
         "task": [
           {
             "name": "udp-latency-measurement",
             "registry": "urn:...."
           },
           {
             "name": "icmp-latency-measurement",
             "registry": "urn:...."
           },



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 37]


Internet-Draft               LMAP Data Model                  April 2015


           {
             "name": "iperf-server",
             "program": "iperf",
             "option": [
               {
                 "name": "role",
                 "value": "server"
               }
             ],
             "suppress-by-default": false
           },
           {
             "name": "lmap-reporting-task",
             "program": "lmap-reportd"
           }
         ]
       },
       "timings": {
         "timing": [
           {
             "name": "hourly",
             "periodic": {
               "interval": 3600000,
               "start": "2014-09-01T17:44:00+02:00",
               "end": "2014-09-30T00:00:00+02:00"
             }
           },
           {
             "name": "daily",
             "calendar": {
               "hour": [
                 04
               ]
             }
           },
           {
             "name": "tuesday-thursday-sunday",
             "calendar": {
               "weekday": [
                 "tuesday",
                 "thursday",
                 "sunday"
               ],
               "hour": [
                 18
               ],
               "minute": [
                 04



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 38]


Internet-Draft               LMAP Data Model                  April 2015


               ],
               "second": [
                 42
               ],
               "end": "2014-09-30T00:00:00+02:00"
             }
           },
           {
             "name": "once-every-six-hours",
             "calendar": {
               "hour": [
                 0,
                 6,
                 12,
                 18
               ],
               "minute": [
                 0
               ],
               "second": [
                 0
               ],
               "end": "2014-09-30T00:00:00+02:00"
             },
             "random-spread": 21600000
           },
           {
             "name": "immediate",
             "immediate": [null]
           },
           {
             "name": "startup",
             "startup": [null],
             "random-spread": 12345
           }
         ]
       }
     },
     "ietf-lmap-control:lmap-state": {
       "agent": {
         "agent-id": "550e8400-e29b-41d4-a716-446655440000",
         "device-id": "urn:dev:mac:0024befffe804ff1",
         "hardware": "ACME home router",
         "firmware": "OpenWrt version 10.03.1",
         "version": "Measurement Agent Daemon (MAD) 4.2",
         "last-started": "2015-04-10T17:24:42+02:00"
       },
       "tasks": {



Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 39]


Internet-Draft               LMAP Data Model                  April 2015


         "task": [
           {
             "name": "udp-latency-measurement",
             "registry": "urn:...."
           },
           {
             "name": "icmp-latency-measurement",
             "registry": "urn:...."
           },
           {
             "name": "iperf",
             "program": "iperf"
           },
           {
             "name": "lmap-reporting-task",
             "program": "lmap-reportd",
             "last-completion": "2015-01-23T12:00:00+01:00",
             "last-status": 0,
             "last-message": "OK",
             "last-failed-completion": "2015-01-23T03:00:00+01:00",
             "last-failed-status": 42,
             "last-failed-message": "connection timed out"
           }
         ]
       }
     }
   }


Authors' Addresses

   Juergen Schoenwaelder
   Jacobs University Bremen

   Email: j.schoenwaelder@jacobs-university.de


   Vaibhav Bajpai
   Jacobs University Bremen

   Email: v.bajpai@jacobs-university.de










Schoenwaelder & Bajpai  Expires October 12, 2015               [Page 40]


Html markup produced by rfcmarkup 1.129c, available from https://tools.ietf.org/tools/rfcmarkup/