[Search] [txt|pdfized|bibtex] [Tracker] [Email] [Diff1] [Diff2] [Nits]

Versions: 00 01 02 03 04                                                
Internet Working Group                                        Y. Jiang
                                                                X. Liu
Internet Draft                                                   J. Xu
                                                                Huawei
Intended status: Standards Track                           R. Cummings
                                                  National Instruments
Expires: April 2015                                   October 16, 2015


                     YANG Data Model for IEEE 1588v2
                   draft-jlx-tictoc-1588v2-yang-01.txt


Status of this Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts.

   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."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html

   This Internet-Draft will expire on April 16, 2016.

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




Jiang, et al           Expires April 16, 2016                 [Page 1]


Internet-Draft            1588v2 YANG Model               October 2015


   Section 4.e of the Trust Legal Provisions and are provided without
   warranty as described in the Simplified BSD License.

Abstract

   This document defines a YANG data model for the configuration of
   IEEE 1588v2 devices and clocks, and also retrieval of the
   configuration information, data set and running states of IEEE
   1588v2 clocks.

Table of Contents

   1.   Introduction .............................................. 2
   2.   Conventions used in this document ......................... 3
   3.   Terminology ............................................... 3
   4.   IEEE 1588V2 YANG Model hierarchy .......................... 4
   5.   IEEE 1588v2 YANG Module ................................... 7
   6.   Security Considerations .................................. 18
   7.   IANA Considerations ...................................... 19
   8.   References ............................................... 19
      8.1. Normative References .................................. 19
      8.2. Informative References ................................ 19
   9.   Acknowledgments .......................................... 20



1. Introduction

   As a synchronization protocol, IEEE 1588v2 [IEEE1588] is widely
   supported in the carrier networks. It can provide high precision
   time synchronization as high as nano-seconds. The protocol depends
   on a Precision Time Protocol (PTP) engine to automatically decide
   its state, and a PTP transportation layer to carry the PTP timing
   and various quality messages. The configuration parameters and
   state data sets of IEEE 1588v2 are numerous.

   Some work on IEEE 1588v2 MIB [PTP-MIB] is in progress in the IETF
   TICTOC WG. But the work is only scoped with retrieval of the state
   data of IEEE 1588v2 by Simple Network Management Protocol (SNMP)
   and configuration is not considered, thus its use is limited.

   Some service providers require the management of the IEEE 1588v2
   synchronization network can be more flexible and more Internet-
   based (typically overlaid on their transport networks). Software
   Defined Network (SDN) is another driving factor which demands a
   greater control over synchronization networks.



Jiang, et al           Expires April 16, 2014                 [Page 2]


Internet-Draft            1588v2 YANG Model               October 2015


   YANG [RFC6020] is a data modeling language used to model
   configuration and state data manipulated by the Network
   Configuration Protocol (NETCONF) [RFC6241]. A small set of built-in
   data types are defined in [RFC6020], and a collection of common
   data types are further defined in [RFC6991]. Advantages of YANG
   include Internet based configuration capability, validation, roll-
   back and etc., all these characteristics make it attractive to
   become a modeling language for IEEE 1588v2.

   This document defines a YANG [RFC6020] data model for the
   configuration of IEEE 1588v2 devices and clocks, and also retrieval
   of the state data of IEEE 1588v2 clocks.

   In order to fulfill the need of a lightweight implementation, the
   core module is designed to be generic and minimal, but be
   extensible with capability negotiation. That is, if a node is
   verified with a capability of more functions, then more modules can
   be loaded on demand, otherwise, only a basic module is loaded on
   the node.

   This document defines PTP system information, PTP data sets and
   running states following the structure and definitions in IEEE
   1588v2, and compatible with [PTP-MIB]. The router specific 1588v2
   information is out of scope of this document.

2. Conventions used in this document

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

3. Terminology

   Terminologies used in this document are extracted from [IEEE1588]
   and [PTP-MIB].

   ARB     Arbitrary Timescale

   BC     Boundary Clock

   DS     Data Set

   E2E     End-to-End

   EUI     Extended Unique Identifier.

   GPS     Global Positioning System


Jiang, et al           Expires April 16, 2014                 [Page 3]


Internet-Draft            1588v2 YANG Model               October 2015


   IANA    Internet Assigned Numbers Authority

   IP      Internet Protocol

   NIST    National Institute of Standards and Technology

   NTP     Network Time Protocol

   OC      Ordinary Clock

   P2P     Peer-to-Peer

   PTP     Precision Time Protocol

   TAI     International Atomic Time

   TC      Transparent Clock

   UDP     User Datagram Protocol

   UTC     Coordinated Universal Time



4. IEEE 1588V2 YANG Model hierarchy

   This section describes the hierarchy of IEEE 1588v2 YANG module.
   Query and retrieval of device wide or port specific configuration
   information and clock data set is described for this version.

   Query and retrieval of clock information include:

   - Clock data set attributes in a clock node, including: current-DS,
   clock-parent-DS, default-DS, time-properties-DS, and
   transparentClock-default-DS.

   - Port specific data set attributes, including: port-DS and
   transparentClock-port-DS.










Jiang, et al           Expires April 16, 2014                 [Page 4]


Internet-Draft            1588v2 YANG Model               October 2015


   module: ietf-yang-ptp-dataset
      +--rw  ptp-datasets
       +--rw domain-number   uint8
       +--rw default-DS
       |  +--rw two-step-flag?    boolean
       |  +--rw clock-identity?   binary
       |  +--rw number-ports?     uint16
       |  +--rw clock-quality
       |  |  +--rw clock-class?                  uint8
       |  |  +--rw clock-accuracy?               uint8
       |  |  +--rw offset-scaled-log-variance?   uint16
       |  +--rw priority1?        uint8
       |  +--rw priority2?        uint8
       |  +--rw slave-only?       boolean
       +--rw current-DS
       |  +--rw steps-removed?        uint16
       |  +--rw offset-from-master?   binary
       |  +--rw mean-path-delay?      binary
       +--rw parent-DS
       |  +--rw parent-port-identity
       |  |  +--rw clock-identity?   binary
       |  |  +--rw port-number?      uint32
       |  +--rw parent-stats?                              boolean
         |  +--rw observed-parent-offset-scaled-log-variance?   uint16
         |  +--rw observed-parent-clock-phase-change-rate?      int32
         |  +--rw grandmaster-identity?                         binary
         |  +--rw grandmaster-clock-quality
         |  |  +--rw grandmaster-clock-class?                  uint8
         |  |  +--rw grandmaster-clock-accuracy?               uint8
         |  |  +--rw grandmaster-offset-scaled-log-variance?   uint16
         |  +--rw grandmaster-priority1?                        uint8
         |  +--rw grandmaster-priority2?                        uint8
         +--rw time-properties-DS
         |  +--rw current-UTC-offset-valid?   boolean
         |  +--rw current-UTC-offset?         uint16
         |  +--rw leap59?                     boolean
         |  +--rw leap61?                     boolean
         |  +--rw time-traceable?             boolean
         |  +--rw frequency-traceable?        boolean
         |  +--rw PTP-timescale?              boolean
         |  +--rw time-source?                uint8
         +--rw port-DS
         |  +--rw port-number                    uint32
         |  +--rw port-identity
         |  |  +--rw clock-identity?   binary
         |  |  +--rw port-number?      uint32
         |  +--rw port-state?                    uint8


Jiang, et al           Expires April 16, 2014                 [Page 5]


Internet-Draft            1588v2 YANG Model               October 2015


         |  +--rw log-min-delay-req-interval?    int8
         |  +--rw peer-mean-path-delay?          int64
         |  +--rw log-announce-interval?         int8
         |  +--rw announce-receipt-timeout?      uint8
         |  +--rw log-sync-interval?             int8
         |  +--rw delay-mechanism?               enumeration
         |  +--rw log-min-Pdelay-req-interval?   int8
         |  +--rw version-number?                uint8
         +--rw transparent-clock-default-DS
         |  +--rw clock-identity?    binary
         |  +--rw number-ports?      uint16
         |  +--rw delay-mechanism?   enumeration
         |  +--rw primary-domain?    uint32
         +--rw transparent-clock-port-DS
            +--rw port-identity
            |  +--rw clock-identity?   binary
            |  +--rw port-number?      uint32
            +--rw log-min-Pdelay-req-interval?   int8
            +--rw faulty-flag?                   boolean
            +--rw peer-mean-path-delay?          int64




























Jiang, et al           Expires April 16, 2014                 [Page 6]


Internet-Draft            1588v2 YANG Model               October 2015


5. IEEE 1588v2 YANG Module

   module ietf-yang-ptp-dataset {
     namespace "urn:ietf:params:xml:ns:yang:1588v2";
     prefix "ptp-dataset";
     organization "IETF TICTOC WG";
     contact "jiangyuanlong@huawei.com";
     description
          "This YANG module defines a data model for the configuration
          of IEEE 1588v2 devices and clocks, and also retrieval of the
          state data of IEEE 1588v2 clocks.";
     revision "2015-10-15"{
       description "Initial revision.";
        reference "draft-jxl-tictoc-1588v2-yang";
      }

     grouping default-DS-entry {
       description
             "This group bundles together all information about the
             PTP clock Default Datasets for a single device.";

       leaf two-step-flag {
         description
               "This object specifies whether the Two Step process is
               used.";
         type boolean;
       }
       leaf clock-identity {
         description
               "This object specifies the clockIdentity of the local
               clock";
         config true;
         type binary {
           length "8";
         }
       }

       leaf number-ports {
         description
               "This object specifies the number of PTP ports on the
               device.";
         type uint16;
       }

       container clock-quality {
         description



Jiang, et al           Expires April 16, 2014                 [Page 7]


Internet-Draft            1588v2 YANG Model               October 2015


               "This object specifies the default clockQuality of the
               device, which contains clockClass, clockAccuracy and
               offsetScaledLogVariance.";

         leaf clock-class {
           description
                 "This object specifies the Quality Class in the
                 defaultDS.";
           type uint8;
         }
         leaf clock-accuracy {
           description
                 "This object specifies the Quality Accuracy in the
                 defaultDS.";
           type uint8;
         }
         leaf offset-scaled-log-variance {
           description
                 "This object specifies the Quality offset in the
                 defaultDS.";
           type uint16;
         }
       }

       leaf priority1 {
         description
               "This object specifies the clock Priority1 in the
               defaultDS ";
         type uint8;
       }
       leaf priority2{
         description
               "This object specifies the clock Priority2 in the
               defaultDS ";
         type uint8;
       }


       leaf slave-only {
         description
               "This object indicates whether the SlaveOnly flag is
               set";
         type boolean;
       }
     }

     grouping current-DS-entry {


Jiang, et al           Expires April 16, 2014                 [Page 8]


Internet-Draft            1588v2 YANG Model               October 2015


       description
             "This group bundles together all information about the
             PTP clock Current Datasets for a single device.";

       leaf steps-removed {
            description
               "This object specifies the distance measured by the
               number of Boundary clocks between the local clock and
               the Foreign master as indicated in the stepsRemoved
               field of Announce messages.";
          type uint16;
          default 0;
       }
       leaf offset-from-master {
          description
               "This object specifies the current clock dataset
               ClockOffset value. The value of the computation of the
               offset in time between a slave and a master clock.";
          type binary {
            length "1..255";
          }
       }
       leaf mean-path-delay {
          description
               "The mean path delay between a pair of ports as measured
               by the delay request-response mechanism.";
          type binary {
            length "1..255";
          }
       }
     }

     grouping parent-DS-entry {
       description
             "This group bundles together all information about the
             PTP clock Parent Datasets for a single device.";

       leaf parent-port-identity {
          description
               "This object specifies the value of portIdentity of the
               port on the master that issues the Sync messages used in
               synchronizing this clock.";

         leaf clock-identity {
           description
                 "This object identifies the clockIdentity of the
                 master clock.";


Jiang, et al           Expires April 16, 2014                 [Page 9]


Internet-Draft            1588v2 YANG Model               October 2015


           type binary {
             length "8";
           }
         }

         leaf port-number {
           description
                 "This object identifies the PortNumber for the port
                 on the specific master.";
           type uint32{
             range "0..65535";
           }
         }
              }
       leaf parent-stats {
          description
               "This object indicates whether the values of
               parentDS.observedParentOffsetScaledLogVariance and
               parentDS.observedParentClockPhaseChangeRate have been
               measured and are valid.";
          type boolean;
          default false;
       }
       leaf observed-parent-offset-scaled-log-variance {
          description
               "This object specifies an estimate of the parent clock's
               phase change rate as measured by the slave clock.";

         type uint16;
          default 0xFFFF;
       }
       leaf observed-parent-clock-phase-change-rate {
          description
               "This object specifies the clock's parent dataset
               ParentClockPhaseChangeRate value. This value is an
               estimate of the parent clock's phase change rate as
               measured by the slave clock.";
          type int32;
       }
       leaf grandmaster-identity {
          description
               "This object specifies the clockIdentity of the
               Grandmaster clock.";
          type binary{
            length "8";
          }
       }


Jiang, et al           Expires April 16, 2014                [Page 10]


Internet-Draft            1588v2 YANG Model               October 2015


       container grandmaster-clock-quality {
         description
               "This object specifies the clockQuality of the
               grandmaster clock.";

         leaf grandmaster-clock-class {
           description
                 "This object specifies the Quality Class of
                 grandmaster clock.";
           type uint8;
         }
         leaf grandmaster-clock-accuracy {
           description
                 "This object specifies the Quality Accuracy of the
                 grandmaster clock.";
           type uint8;
         }
         leaf grandmaster-offset-scaled-log-variance {
           description
                 "This object specifies the Quality offset of the
                 grandmaster clock.";
           type uint16;
         }
       }
       leaf grandmaster-priority1 {
          description
               "This object specifies the priority1 attribute of the
               grandmaster clock.";
          type uint8;
       }
       leaf  grandmaster-priority2 {
          description
               "This object specifies the priority2 attribute of the
               grandmaster clock.";
          type uint8;
       }

     }



     grouping time-properties-DS-entry {
       description
               "This group bundles together all information about the
               PTP clock time properties datasets for a single device.";

       leaf current-UTC-offset-valid {


Jiang, et al           Expires April 16, 2014                [Page 11]


Internet-Draft            1588v2 YANG Model               October 2015


          description
               "This object indicates whether current UTC offset is
               valid.";
          type boolean;
       }
       leaf current-UTC-offset {
          description
               "This object specifies the offset between TAI and UTC
               when the epoch of the PTP system is the PTP epoch,
               otherwise the value has no meaning. The value shall be
               in units of seconds.";
          type uint16;
       }
       leaf leap59 {
          description
               "This object indicates whether the last minute of the
               current UTC day contains 59 seconds.";
          type boolean;
       }
       leaf leap61 {
          description
               "This object indicates whether the last minute of the
               current UTC day contains 61 seconds.";
          type boolean;
       }
       leaf time-traceable {
          description
               "This object indicates whether the timescale and the
               currentUtcOffset are traceable to a primary reference.";
          type boolean;
       }
       leaf frequency-traceable {
          description
               "This object indicates whether the frequency determining
               the timescale is traceable to a primary reference.";
          type boolean;
       }
       leaf PTP-timescale {
          description
               "This object indicates whether the clock timescale of
               the grandmaster clock is PTP.";
          type boolean;
       }
       leaf time-source {
          description
               "This object specifies the source of time used by the
               grandmaster clock.";


Jiang, et al           Expires April 16, 2014                [Page 12]


Internet-Draft            1588v2 YANG Model               October 2015


         type uint8;
       }
     }

      grouping port-DS-entry {
       description
               "This group bundles together all information about the
               clock ports dataset for a single clock port.";

       container port-identity {
          description
               "This object specifies the PTP clock port Identity,
               composed of clock-identity and portNumber.";
          leaf clock-identity {
            description
              "This object identify a specific PTP node.";
            config true;
            type binary {
              length "8";
            }
          }

          leaf port-number {
            description
                 "This object specifies the PTP Portnumber for this
                 port.";
            type uint32 {
              range "0..65535";
            }
          }
       }

       leaf port-state {
         description
               "This object specifies the current state of the protocol
               engine associated with the port.";
         type uint8;
         default 1;
       }

       leaf log-min-delay-req-interval {
 description
               "This object specifies the Delay_Req message
               transmission interval.";
          type int8;
       }


Jiang, et al           Expires April 16, 2014                [Page 13]


Internet-Draft            1588v2 YANG Model               October 2015



       leaf peer-mean-path-delay {
 description
               "This object specifies an estimate of the current one-
               way propagation delay on the link when the
               delayMechanism is P2P, otherwise it shall be zero.";
 type int64;
 default 0;
       }

       leaf log-announce-interval {
          description
               "This object specifies the Announce message transmission
               interval associated with this clock port.";
          type int8;
       }

       leaf announce-receipt-timeout {
          description
               "This object specifies the number of announceInterval
               that have to pass without receipt of an Announce message
               before the occurrence of the event
               ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES.";
          type uint8;
       }

       leaf log-sync-interval {
          description
               "This object specifies the mean time interval between
               successive Sync messages.";
          type int8;
       }

       leaf delay-mechanism {
          description
               "This object specifies the delay measuring mechanism
               used by the port. If the clock is an end-to-end clock,
               the value is e2e, else if the clock is a peer-to-peer
               clock, the value shall be p2p.";
          type enumeration {
            enum E2E {
              value 01;
              description
                    "The port is configured to use the delay request-
                    response mechanism.";
            }
            enum P2P {


Jiang, et al           Expires April 16, 2014                [Page 14]


Internet-Draft            1588v2 YANG Model               October 2015


              value 02;
              description
                    "The port is configured to use the peer delay
                    mechanism.";
            }
            enum DISABLED {
              value 254;
              description
                    "The port does not implement the delay mechanism.";
            }
          }
       }

       leaf log-min-Pdelay-req-interval {
         description
               "This object specifies the minimum permitted mean time
               interval between successive Pdelay_Req messages.";
         type int8;
       }

       leaf version-number {
          description
               "This object specifies the version of this standard
               implemented on the port.";
          type uint8;
       }
     }

     grouping transparent-clock-default-DS-entry {
       description
               "This group bundles together the default data sets of a
               transparent clock.";
       leaf clock-identity {
         description
               "This object specifies the value of the clockIdentity
               attribute of the local clock.";
         type binary {
           length "8";
         }
       }
       leaf number-ports {
         description
               "This object specifies the number of PTP ports of the
               device.";
         type uint16;
       }
       leaf delay-mechanism {


Jiang, et al           Expires April 16, 2014                [Page 15]


Internet-Draft            1588v2 YANG Model               October 2015


         description
               "This object specifies the delayMechanism of the
               transparent clock.";
         type enumeration {
           enum E2E {
             value 1;
             description
                   "The port is configured to use the delay request-
                   response mechanism.";
           }
           enum P2P {
             value 2;
             description
                   "The port is configured to use the peer delay
                   mechanism.";
           }
           enum DISABLED {
             value 254;
             description
                   "The port does not implement the delay mechanism.";
           }
         }
       }
       leaf primary-domain {
         description
               "This object specifies the value of the primary
               syntonization domain.";
         type uint32 {
           range "0..255";
         }
         default 0;
       }
     }

     grouping transparent-clock-port-DS-entry {
       description
               "This group bundles together the port data sets of a
               transparent clock.";

       container port-identity {
         description
               "This object specifies the portIdentity of the local
               port.";
         leaf clock-identity {
           config true;
           type binary {
             length "8";


Jiang, et al           Expires April 16, 2014                [Page 16]


Internet-Draft            1588v2 YANG Model               October 2015


           }
         }

         leaf port-number {
           type uint32 {
             range "0..65535";
           }
         }
       }
       leaf log-min-Pdelay-req-interval {
          description
               "This object specifies the minimum permitted mean time
               interval between successive Pdelay_Req messages.";
         type int8;
       }
       leaf faulty-flag {
          description
               "This object indicates whether the port is faulty.";
          type boolean;
          default false;
       }
       leaf peer-mean-path-delay {
          description
               "This object specifies an estimate of the current one-
               way propagation delay on the link when the
               delayMechanism is P2P, otherwise it shall be zero.";

         type int64;
          default 0;
       }
     }

     list ptp-datasets {

       key "domain-number";
       min-elements "1";

       description
             "List of one or more PTP datasets in the device, one for
             each domain-number (see IEEE 1588-2008 subclause 6.3)";

       leaf domain-number {
         type uint8;
       }

        container default-DS {
          uses default-DS-entry;


Jiang, et al           Expires April 16, 2014                [Page 17]


Internet-Draft            1588v2 YANG Model               October 2015


        }

        container current-DS {
          uses current-DS-entry;
        }

        container parent-DS {
          uses parent-DS-entry;
        }

        container time-properties-DS {
          uses time-properties-DS-entry;
        }

        container port-DS {
         uses port-DS-entry;
        }

         list port-DS {
          key "port-number";
          min-elements "1";
          leaf port-number {
            type uint32 {
              range "0..65535";
            }
          }
          uses port-DS-entry;
        }

        container transparent-clock-default-DS {
          uses transparent-clock-default-DS-entry;
        }

        container transparent-clock-port-DS {
          uses transparent-clock-port-DS-entry;
        }
     }
   }
6. Security Considerations

   YANG modules are designed to be accessed via the NETCONF protocol
   [RFC6241], thus security considerations in [RFC6241] apply here.
   Security measures such as using the NETCONF over SSH [RFC6242] and
   restricting its use with access control [RFC6536] can further
   improve its security, avoid injection attacks and misuse of the
   protocol.



Jiang, et al           Expires April 16, 2014                [Page 18]


Internet-Draft            1588v2 YANG Model               October 2015


   Some data nodes defined in this YANG module are writable, and any
   changes to them may adversely impact a synchronization network.

7. IANA Considerations

   This document registers a URI in the IETF XML registry, and the
   following registration is requested to be made:

   URI: urn:ietf:params:xml:ns:yang:1588v2

   This document registers a YANG module in the YANG Module Names:

   name: 1588v2 namespace: urn:ietf:params:xml:ns:yang:1588v2


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

   [IEEE1588] IEEE, "IEEE Standard for a Precision Clock
             Synchronization Protocol for Networked Measurement and
             Control Systems", IEEE Std 1588-2008, July 2008

8.2. Informative References

   [RFC6241] Enns, R., Bjorklund, M., Schoenwaelder, J., and A.
             Bierman, "Network Configuration Protocol (NETCONF)", RFC
             6241, June 2011

   [RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure
             Shell (SSH)", RFC 6242, June 2011

   [RFC6536] Bierman, A. and M. Bjorklund, "Network Configuration
             Protocol (NETCONF) Access Control Model", RFC 6536, March
             2012




Jiang, et al           Expires April 16, 2014                [Page 19]


Internet-Draft            1588v2 YANG Model               October 2015


   [PTP-MIB] Shankarkumar, V., Montini, L., Frost, T., and Dowd, G.,
             "Precision Time Protocol Version 2 (PTPv2) Management
             Information Base", draft-ietf-tictoc-ptp-mib-07, Work in
             progress



9. Acknowledgments

   TBD


Authors' Addresses


   Yuanlong Jiang
   Huawei Technologies Co., Ltd.
   Bantian, Longgang district
   Shenzhen 518129, China
   Email: jiangyuanlong@huawei.com


   Xian Liu
   Huawei Technologies Co., Ltd.
   Bantian, Longgang district
   Shenzhen 518129, China


   Jinchun Xu
   Huawei Technologies Co., Ltd.
   Bantian, Longgang district
   Shenzhen 518129, China

   Rodney Cummings
   National Instruments
   Email: Rodney.Cummings@ni.com












Jiang, et al           Expires April 16, 2014                [Page 20]