Generic YANG Data Model for Operations, Administration, and Maintenance (OAM) Performance Management
draft-wang-lime-yang-pm-00

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Document Type Active Internet-Draft (individual)
Authors Zitao Wang  , Qin Wu  , Deepak Kumar  , Tom Taylor 
Last updated 2015-06-19
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Network Working Group                                            Z. Wang
Internet-Draft                                                     Q. Wu
Intended status: Standards Track                                  Huawei
Expires: December 21, 2015                                      D. Kumar
                                                                   Cisco
                                                               T. Taylor
                                                    PT Taylor Consulting
                                                           June 19, 2015

Generic YANG Data Model for Operations, Administration, and Maintenance
                      (OAM) Performance Management
                       draft-wang-lime-yang-pm-00

Abstract

   This document presents a YANG Data model for OAM Performance
   Management support.  The YANG Model presented in this document
   extends the Generic YANG Data Model for OAM by adding loss and delay
   measurements to support OAM Performance Management.

Status of This Memo

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

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

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

   This Internet-Draft will expire on December 21, 2015.

Copyright Notice

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

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

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

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions and Terminology . . . . . . . . . . . . . . . . .   2
     2.1.  Abbreviations . . . . . . . . . . . . . . . . . . . . . .   3
   3.  YANG Extension  . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  MEP Configuration Extension . . . . . . . . . . . . . . .   4
       3.1.1.  Loss Measurement Configuration  . . . . . . . . . . .   4
     3.2.  Delay Measurement Configuration . . . . . . . . . . . . .   6
     3.3.  rpc definitions . . . . . . . . . . . . . . . . . . . . .   8
       3.3.1.  create-loss-measurement . . . . . . . . . . . . . . .   8
       3.3.2.  abort-loss-measurement  . . . . . . . . . . . . . . .   8
       3.3.3.  create-delay-measurement  . . . . . . . . . . . . . .   8
       3.3.4.  abort-delay-measurement . . . . . . . . . . . . . . .   8
   4.  Performance Monitoring Data Hierarchy . . . . . . . . . . . .   8
   5.  Performance Monitoring YANG Module  . . . . . . . . . . . . .  14
   6.  Open Issues . . . . . . . . . . . . . . . . . . . . . . . . .  35
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  35
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  35
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  35
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  35
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  36
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  36

1.  Introduction

   The Generic OAM Yang model [GENYANGGOAM] presents a generic Yang data
   model applicable to all OAM technologies.

   In this document we extend the YANG model defined in [GENYANGGOAM] by
   adding loss and delay measurement to support OAM Performance
   Management.  Details are provided in Section 4 below.

2.  Conventions and Terminology

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

   The following terms are defined in [RFC6241] and are not redefined
   here:

   o  client

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   o  configuration data

   o  server

   o  state data

   The following terms are defined in [RFC6020] and are not redefined
   here:

   o  augment

   o  data model

   o  data node

   The terminology for describing YANG data models is found in
   [RFC6020].

2.1.  Abbreviations

      1SL - One-way Synthetic Loss Measurement message

      1DM - One-way Delay Measurement message

      DMM - Delay Measurement message

      DMR - Delay Measurement reply

      MA - Maintenance Association [IEEE802.1Q] [RFC7174]

      MD - Maintenance Domain [IEEE802.1Q]

      MP - Maintenance Point [IEEE802.1Q]

      MEP - Maintenance End Point [RFC7174] [IEEE802.1Q] [RFC6371]

      MIP - Maintenance Intermediate Point [RFC7174] [IEEE802.1Q]
      [RFC6371]

      OAM - Operations, Administration, and Maintenance [RFC6291]

      PM - Performance monitoring

      SLM - Synthetic Loss Measurement message

      SLR - Synthetic Loss Measurement reply

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3.  YANG Extension

   MEP addressing is defined in the Generic YANG OAM model
   [GENYANGGOAM].  In this draft we augment MEP configuration with the
   ability to configure performance management configuration and collect
   delay and loss statistics.  In addition, we define new remote
   procedure calls for performance measurement.

3.1.  MEP Configuration Extension

3.1.1.  Loss Measurement Configuration

   This section describes a set of data definitions for loss measurement
   configuration.  This set of data definitions augments the MEP
   configuration defined in the Generic YANG OAM model with parameters
   related to loss measurement, defines the role of the MEP, and
   specifies the measurement method to use for loss measurement.

      module: ietf-gen-oam-pm

   /*This set of data definitions defines the role of MEP.*/
      augment /goam:domains/goam:domain/goam:MAs/goam:MA/goam:MEP:
         +--rw loss-responder?   boolean
   /*This set of data definitions defines loss measurement */
   /*configuration*/
      augment /goam:domains/goam:domain/goam:MAs/goam:MA/goam:MEP:
      +--rw loss-measurements?
         +--ro loss-measurements* [session-cookie]
         |  +--ro session-cookie    uint32
         |  +--ro id?               string
         |  +--ro status?           boolean
         +--rw measurement-type
         |  +--rw slm?              boolean
         |  +--rw pm_1sl?           boolean
         +--rw enabled-counters
         |  +--rw availability-forward-high-loss?             boolean
         |  +--rw availability-forward-availables?            boolean
         |  +--rw availability-forward-unavailable?           boolean
         |  +--rw availability-backward-high-loss?            boolean
         |  +--rw availability-backward-consecutive-high-loss? boolean
         |  +--rw availability-backward-available?            boolean
         |  +--rw available-backward-unavailable?             boolean
         +--rw message-period?             uint32
         +--rw data-pattern?               enumeration
         +--rw measurement-interval?       uint32
         +--rw number-intervals-stored?    uint32
         +--rw availability-measurement-interval? uint32
         +--rw availability-consecutive-intervals-number? unit32

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         +--rw session-type?               enumeration
         +--rw thresholds* [id]
         |  +--rw id                       uint32
         |  +--rw enabled-threshold
         |  |  +--rw forward-unavailable-count?  boolean
         |  |  +--rw backward-unavailable-count? boolean
         |  |  +--rw forward-available-ratio?    boolean
         |  |  +--rw forward-available-ratio?    boolean
         |  +--rw forward-unavailable-count uint32
         |  +--rw backward-unavailable-count uint32
         |  +--rw forward-available-ratio?   uint32
         |  +--rw backward-available-ratio?   uint32
         +--rw start-time
         |  +--rw (start-time)?
         |     +--:(immediate)
         |     |  +--rw immediate!
         |     +--:(absolute)
         |        +--rw absolute?    yang:date-and-time
         +--rw stop-time
         |  +--rw (stop-time)?
         |     +--:(none)
         |     |  +--rw none!
         |     +--:(absolute)
         |        +--rw absolute?   yang:date-and-time
         +--rw availability-forward-status      enumeration
         +--rw availability-backward-status     enumeration
         +--rw current-stats
         |  +--rw start-time?                 yang:date-and-time
         |  +--rw elapsed-time?                         uint32
         |  +--rw suspect-status?                       boolean
         |  +--rw forward-available?          yang:gauge32
         |  +--rw backward-available?         yang:gauge32
         |  +--rw forward-unavailable?        yang:gauge32
         |  +--rw backward-unavailable?       yang:gauge32
         +--rw history-stats* [id]
            +--rw id                                    uint32
            +--rw start-time?               yang:date-and-time
            +--rw elapsed-time?                         uint32
            +--rw suspect-status?                       boolean
            +--rw forward-available?          yang:gauge32
            +--rw backward-available?         yang:gauge32
            +--rw forward-unavailable?        yang:gauge32
            +--rw backward-unavailable?       yang:gauge32

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3.2.  Delay Measurement Configuration

   This section describes a set of data definitions for delay
   measurement configuration.  This set of data definitions augments the
   MEP configuration defined in the Generic YANG OAM model with
   parameters related to delay measurement, defines the role of the MEP,
   and specifies the measurement method to use for delay measurement.

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      module: ietf-gen-oam-pm

   /*This set of data definitions defines the role of MEP.*/
         augment /goam:domains/goam:domain/goam:MAs/goam:MA/goam:MEP:
            +--rw delay-responder?   boolean

   /*This set of data definitions defines delay measurement */
   /* configuration*/
         augment /goam:domains/goam:domain/goam:MAs/goam:MA/goam:MEP:
         +--rw delay-measurements?
            +--ro delay-measurements* [session-cookie]
            |  +--ro session-cookie    uint32
            |  +--ro id?               string
            |  +--ro status?           boolean
            +--rw measurement-type
            |  +--rw dmm?              boolean
            |  +--rw dm1-transmitted?  boolean
            |  +--rw dm1-received?     boolean
            +--rw measurement-enable
            +--rw message-period?                         uint32
            +--rw data-pattern?                           enumeration
            +--rw measurement-interval?                   uint32
            +--rw number-intervals-stored?                uint32
            +--rw session-type?                           enumeration
            +--rw thresholds* [id]
            |  +--rw id                                   uint32
            |  +--rw enabled-thresholds?                  bits
            +--rw start-time
            |  +--rw (start-time)?
            |     +--:(immediate)
            |     |  +--rw immediate!
            |     +--:(absolute)
            |        +--rw absolute?    yang:date-and-time
            +--rw stop-time
            |  +--rw (stop-time)?
            |     +--:(none)
            |     |  +--rw none!
            |     +--:(absolute)
            |        +--rw absolute?   yang:date-and-time
            +--rw current-stats
            |  +--rw start-time?                   yang:date-and-time
            |  +--rw elapsed-time?                             uint32
            |  +--rw suspect-status?                           boolean
            +--rw history-stats* [id]
               +--rw id                                        uint32
               +--rw start-time?                   yang:date-and-time
               +--rw elapsed-time?                             uint32
               +--rw suspect-status?                           boolean

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3.3.  rpc definitions

   The rpc model facilitates issuing commands to a NETCONF server (in
   this case to the device that needs to execute the OAM command) and
   obtaining a response.

   Configuration data in Section 3.2 and Section 3.1.1 provide the input
   extension for delay and loss measurement RPCs.

3.3.1.  create-loss-measurement

   This RPC allows scheduling of a one-way or two-way on-demand or
   proactive performance monitoring loss measurement session.

3.3.2.  abort-loss-measurement

   This RPC allows immediate cancellation of a currently running or
   scheduled loss measurement session.

3.3.3.  create-delay-measurement

   This RPC allows scheduling of a one-way or two-way on-demand or
   proactive performance monitoring delay measurement session.

3.3.4.  abort-delay-measurement

   This RPC allows immediate cancellation of a currently running or
   scheduled delay measurement session.

4.  Performance Monitoring Data Hierarchy

   The complete data hierarchy related to the OAM perfomance monitoring
   YANG extension is presented below.  The following notations are used
   within the tree and carry the meaning as noted below.

   Each node is printed as:

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   <status> <flags> <name> <opts> <type>

   <status> is one of:
        +  for current
        x  for deprecated
        o  for obsolete

   <flags> is one of:

       rw for configuration data
       ro for non-configuration data
       -x for rpcs
       -n for notifications

   <name> is the name of the node

   If the node is augmented into the tree from another module, its name
   is printed as <prefix>:<name>.

   <opts> is one of:

        ?  for an optional leaf or choice
        !  for a presence container
        *  for a leaf-list or list
        [<keys>] for a list's keys

   <type> is the name of the type for leafs and leaf-lists

      module: ietf-gen-oam-pm
     augment /goam:domains/goam:domain/goam:MAs/goam:MA/goam:MEP:
       +--rw delay-responder?   boolean
       +--rw loss-responder?    boolean

     augment /goam:domains/goam:domain/goam:MAs/goam:MA/goam:MEP:
       +--rw delay-measurements?
          +--ro delay-measurements* [session-cookie]
          |  +--ro session-cookie    uint32
          |  +--ro id?               string
          |  +--ro status?           boolean
          +--rw measurement-type
          |  +--rw dmm?              boolean
          |  +--rw dm1-transmitted?  boolean
          |  +--rw dm1-received?     boolean
          +--rw measurement-enable
          +--rw message-period?                         uint32
          +--rw data-pattern?                           enumeration

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          +--rw measurement-interval?                   uint32
          +--rw number-intervals-stored?                uint32
          +--rw session-type?                           enumeration
          +--rw start-time
          |  +--rw (start-time)?
          |     +--:(immediate)
          |     |  +--rw immediate!
          |     +--:(absolute)
          |        +--rw absolute?    yang:date-and-time
          +--rw stop-time
          |  +--rw (stop-time)?
          |     +--:(none)
          |     |  +--rw none!
          |     +--:(absolute)
          |        +--rw absolute?   yang:date-and-time
          +--rw current-stats
          |  +--rw start-time?                   yang:date-and-time
          |  +--rw elapsed-time?                             uint32
          |  +--rw suspect-status?                           boolean
          +--rw history-stats* [id]
             +--rw id                                        uint32
             +--rw start-time?                   yang:date-and-time
             +--rw elapsed-time?                             uint32
             +--rw suspect-status?                          boolean

      augment /goam:domains/goam:domain/goam:MAs/goam:MA/goam:MEP:
      +--rw loss-measurements?
         +--ro loss-measurements* [session-cookie]
         |  +--ro session-cookie    uint32
         |  +--ro id?               string
         |  +--ro status?           boolean
         +--rw measurement-type
         |  +--rw slm?              boolean
         |  +--rw pm_1sl?              boolean
         +--rw enabled-counters
         |  +--rw availability-forward-high-loss?             boolean
         |  +--rw availability-forward-availables?            boolean
         |  +--rw availability-forward-unavailable?           boolean
         |  +--rw availability-backward-high-loss?            boolean
         |  +--rw availability-backward-consecutive-high-loss? boolean
         |  +--rw availability-backward-available?            boolean
         |  +--rw available-backward-unavailable?             boolean
         +--rw message-period?             uint32
         +--rw data-pattern?               enumeration
         +--rw measurement-interval?       uint32
         +--rw number-intervals-stored?    uint32
         +--rw availability-measurement-interval? uint32
         +--rw availability-consecutive-intervals-number? unit32

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         +--rw session-type?               enumeration
         +--rw thresholds* [id]
         |  +--rw id                       uint32
         |  +--rw enabled-threshold
         |  |  +--rw forward-unavailable-count?  boolean
         |  |  +--rw backward-unavailable-count? boolean
         |  |  +--rw forward-available-ratio?    boolean
         |  |  +--rw forward-available-ratio?    boolean
         |  +--rw forward-unavailable-count uint32
         |  +--rw backward-unavailable-count uint32
         |  +--rw forward-available-ratio?   uint32
         |  +--rw backward-available-ratio?   uint32
         +--rw start-time
         |  +--rw (start-time)?
         |     +--:(immediate)
         |     |  +--rw immediate!
         |     +--:(absolute)
         |        +--rw absolute?    yang:date-and-time
         +--rw stop-time
         |  +--rw (stop-time)?
         |     +--:(none)
         |     |  +--rw none!
         |     +--:(absolute)
         |        +--rw absolute?   yang:date-and-time
         +--rw current-stats
         |  +--rw start-time?               yang:date-and-time
         |  +--rw elapsed-time?                         uint32
         |  +--rw suspect-status?                       Boolean
         |  +--rw forward-available?          yang:gauge32
         |  +--rw backward-available?         yang:gauge32
         |  +--rw forward-unavailable?        yang:gauge32
         |  +--rw backward-unavailable?       yang:gauge32
         +--rw history-stats* [id]
            +--rw id                                    uint32
            +--rw start-time?               yang:date-and-time
            +--rw elapsed-time?                         uint32
            +--rw suspect-status?                       boolean
            +--rw forward-available?          yang:gauge32
            +--rw backward-available?         yang:gauge32
            +--rw forward-unavailable?        yang:gauge32
            +--rw backward-unavailable?       yang:gauge32
   rpcs:
     +---x create-loss-measurement
     |  +--ro input
     |  |  +--rw measurement-type
     |  |  |  +--rw slm?              boolean
     |  |  |  +--rw pm_1sl?              boolean
     |  |  +--rw enabled-counters

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     |  |  |  +--rw availability-forward-high-loss?             boolean
     |  |  |  +--rw availability-forward-availables?            boolean
     |  |  |  +--rw availability-forward-unavailable?           boolean
     |  |  |  +--rw availability-backward-high-loss?            boolean
     |  |  |  +--rw availability-backward-consecutive-high-loss? boolean
     |  |  |  +--rw availability-backward-available?            boolean
     |  |  |  +--rw available-backward-unavailable?             boolean
     |  |  +--ro message-period?            uint32
     |  |  +--ro data-pattern?              enumeration
     |  |  +--ro measurement-interval?      uint32
     |  |  +--ro number-intervals-stored?   uint32
     |  |  +--ro session-type?              enumeration
     |  |  +--ro start-time
     |  |  |  +--ro (start-time)?
     |  |  |     +--:(immediate)
     |  |  |     |  +--ro immediate!
     |  |  |     +--:(absolute)
     |  |  |        +--ro absolute?    yang:date-and-time
     |  |  +--ro stop-time
     |  |  |  +--ro (stop-time)?
     |  |  |     +--:(none)
     |  |  |     |  +--ro none!
     |  |  |     +--:(absolute)
     |  |  |        +--ro absolute?   yang:date-and-time
     |  |  +--ro destination-mep
     |  |     +--ro (mp-address)?
     |  |     |  +--:(mac-address)
     |  |     |  |  +--ro mac-address?    yang:mac-address
     |  |     |  +--:(ipv4-address)
     |  |     |  |  +--ro ipv4-address?   inet:ipv4-address
     |  |     |  +--:(ipv6-address)
     |  |     |     +--ro ipv6-address?   inet:ipv6-address
     |  |     +--ro (MEP-ID)?
     |  |     |  +--:(MEP-ID-int)
     |  |     |     +--ro MEP-ID-int?      int32
     |  |     +--ro MEP-ID-format?         identityref
     |  +--ro output
     |     +--ro session-id    uint32
     +---x abort-loss-measurement
     |  +--ro input
     |     +--ro technology         identityref
     |     +--ro MD-name-string     MD-name-string
     |     +--ro MA-name-string?    MA-name-string
     |     +--ro destination-mep
     |     |  +--ro (mp-address)?
     |     |  |  +--:(mac-address)
     |     |  |  |  +--ro mac-address?    yang:mac-address
     |     |  |  +--:(ipv4-address)

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     |     |  |  |  +--ro ipv4-address?   inet:ipv4-address
     |     |  |  +--:(ipv6-address)
     |     |  |     +--ro ipv6-address?   inet:ipv6-address
     |     |  +--ro (MEP-ID)?
     |     |  |  +--:(MEP-ID-int)
     |     |  |     +--ro MEP-ID-int?      int32
     |     |  +--ro MEP-ID-format?         identityref
     |     +--ro session-id         uint32
     +---x create-delay-measurement
     |  +--ro input
     |  |  +--ro measurement-type
     |  |  |  +--ro dmm?                    boolean
     |  |  |  +--ro dm1-transmitted?        boolean
     |  |  |  +--ro dm1-received?           boolean
     |  |  +--ro measurement-enable
     |  |  +--ro message-period?            uint32
     |  |  +--ro data-pattern?              enumeration
     |  |  +--ro measurement-interval?      uint32
     |  |  +--ro number-intervals-stored?   uint32
     |  |  +--ro session-type?              enumeration
     |  |  +--ro start-time
     |  |  |  +--ro (start-time)?
     |  |  |     +--:(immediate)
     |  |  |     |  +--ro immediate!
     |  |  |     +--:(absolute)
     |  |  |        +--ro absolute?    yang:date-and-time
     |  |  +--ro stop-time
     |  |  |  +--ro (stop-time)?
     |  |  |     +--:(none)
     |  |  |     |  +--ro none!
     |  |  |     +--:(absolute)
     |  |  |        +--ro absolute?   yang:date-and-time
     |  |  +--ro destination-mep
     |  |  |  +--ro (mp-address)?
     |  |  |  |  +--:(mac-address)
     |  |  |  |  |  +--ro mac-address?    yang:mac-address
     |  |  |  |  +--:(ipv4-address)
     |  |  |  |  |  +--ro ipv4-address?   inet:ipv4-address
     |  |  |  |  +--:(ipv6-address)
     |  |  |  |     +--ro ipv6-address?   inet:ipv6-address
     |  |  |  +--ro (MEP-ID)?
     |  |  |  |  +--:(MEP-ID-int)
     |  |  |  |     +--ro MEP-ID-int?      int32
     |  |  |  +--ro MEP-ID-format?         identityref
     |  |  +--ro (flow-entropy)?
     |  |     +--:(flow-entropy-null)
     |  |        +--ro flow-entropy-null   empty
     |  +--ro output

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     |     +--ro session-id    uint32
     +---x abort-delay-measurement
        +--ro input
           +--ro technology         identityref
           +--ro MD-name-string     MD-name-string
           +--ro MA-name-string?    MA-name-string
           +--ro destination-mep
           |  +--ro (mp-address)?
           |  |  +--:(mac-address)
           |  |  |  +--ro mac-address?    yang:mac-address
           |  |  +--:(ipv4-address)
           |  |  |  +--ro ipv4-address?   inet:ipv4-address
           |  |  +--:(ipv6-address)
           |  |     +--ro ipv6-address?   inet:ipv6-address
           |  +--ro (MEP-ID)?
           |  |  +--:(MEP-ID-int)
           |  |     +--ro MEP-ID-int?      int32
           |  +--ro MEP-ID-format?         identityref
           +--ro session-id         uint32

                 Data Hierarchy for Performance Monitoring

5.  Performance Monitoring YANG Module

<CODE BEGINS> file "ietf-gen-oam-pm.yang"
module ietf-gen-oam-pm {
    namespace "urn:ietf:params:xml:ns:yang:ietf-gen-oam-pm";
    prefix goampm;

    import gen-oam {
        prefix goam;
      }
    import ietf-yang-types {
        prefix yang;
      }

    organization
      "IETF LIME (Layer Independent OAM Management in Multi-Layer
       Environment) Working Group";

    contact
      "WG Web:   <http://tools.ietf.org/wg/lime/>
       WG List:  <mailto:lime@ietf.org>
       WG Chair: Ronald Bonica <mailto:rbonica@juniper.net>
                 Carlos Pignataro <mailto:cpignata@cisco.com>
       Editor:   Zitao Wang <mailto:wangzitao@huawei.com>";

    description

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      "This YANG module defines generic loss measurement and
       delay measurement configuration for multi-layer OAM
       management to be used within IETF in a protocol independent
       manner.";

    revision 2015-01-07 {
        description
          "Initial revision.";
        reference "draft-wang-lime-yang-pm";
      }

       /* features */
    feature loss-measurements {
      description
        "This feature indicates that the server supports
         configuration of loss measurement that is used by some OAM
         protocols.

         Servers that do not advertise this feature will not
         configure loss measurement";
    }

    feature delay-measurements {
      description
        "This feature indicates that the server supports
         configuration of delay measurement that is used by some OAM
         protocols.

         Servers that do not advertise this feature will not
         configure delay measurement";
    }

    feature create-loss-measurement{
      description
        "This feature indicates that the server supports executing
         the create-loss-measurement OAM command and returning a
         response. Servers that do not advertise this feature will
         not support execution of the create-loss-measurement command
         or the RPC model for the create-loss-measurement command.";
    }

    feature abort-loss-measurement{
      description
        "This feature indicates that the server supports executing
         the abort-loss-measurement OAM command and returning a
         response. Servers that do not advertise this feature will
         not support execution of the abort-loss-measurement command
         or the RPC model for the abort-loss-measurement command.";

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    }

    feature create-delay-measurement{
      description
        "This feature indicates that the server supports executing
         the create-delay-measurement OAM command and returning a
         response. Servers that do not advertise this feature will
         not support execution of the create-delay-measurement
         command or the RPC model for the create-delay-measurement
         command.";
    }

    feature abort-delay-measurement{
      description
        "This feature indicates that the server supports executing
         the abort-delay-measurement OAM command and returning a
         response. Servers that do not advertise this feature will
         not support execution of the abort-delay-measurement
         command or the RPC model for the abort-delay-measurement
         command.";
    }

    grouping loss-measurement-configuration-group {
      description
        "This grouping includes configuration objects for the loss
         measurement function defined in GEN-PM.";
      reference
        "draft-wang-lime-yang-pm";

      container measurement-type {
        leaf slm   {
          type boolean;
          description
            "If true, generate PM SLM Messages and correlate with
             received SLR responses.";
        }
        leaf pm_1sl{
          type boolean;
          description
            "If true, generate PM 1SL Messages.";
        }
        description
          "This object specifies what type of loss measurement
           will be performed.";
      }

      container enabled-counters {
        leaf availability-forward-high-loss {

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          type boolean;
          default "false";
          description
            "Enable (true) or disable availability-forward-high-loss
             counters found in the current-stats and history-stats.";
        }
        leaf availability-forward-available {
          type boolean;
          default "false";
          description
            "Enable (true) or disable availability-forward-available
             counters found in the current-stats and history-stats ";
        }
        leaf availability-forward-unavailable {
          type boolean;
          default "false";
          description
            "Enable (true) or disable
             availability-forward-unavailable counters found in the
             current-stats and history-stats ";
        }
        leaf availability-backward-high-loss {
          type boolean;
          default "false";
          description
            "Enable (true) or disable availability-backward-high-loss
             counters found in the current-stats and history-stats ";
        }
        leaf availability-backward-consecutive-high-loss {
          type boolean;
          default "false";
          description
            "Enable (true) or disable
             availability-backward-consecutive-high-loss counters
             found in the current-stats and history-stats ";
        }
        leaf availability-backward-available {
          type boolean;
          default "false";
          description
            "Enable (true) or disable availability-backward-available
             counters found in the current-stats and history-stats ";
        }
        leaf availability-backward-unavailable {
          type boolean;
          default "false";
          description
            "Enable (true) or disable available-backward-unavailable

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             counters found in the current-stats and history-stats ";
        }
        description
          "Indicates the types of PM loss measurement counters found
           in the current-stats and history-stats that are enabled.

           Not all counters are supported for all PM Loss Measurement
           types.";
      }
      /* This terminates the enabled-counters clause */

      leaf message-period {
        type uint32;
        units "ms";
        default 1000;
        description
          "This object specifies the interval between loss
           measurement OAM message transmissions.";
      }

      leaf data-pattern {
        type enumeration {
          enum zeroes {
            description "Indicates the Data TLV contains all 0s.";
          }
          enum ones {
            description "Indicates the Data TLV contains all 1s.";
          }
        }
        default zeroes;
        description
          "This object specifies the loss measurement data pattern
           included in the OAM Message.";
      }

      leaf measurement-interval {
        type uint32;
        units "minutes";
        default 15;

        description
          "This object specifies a measurement interval in
           minutes. Measurements are accumulated in the current-stats
           counters for the duration of this interval, and then
           transferred to the history-stats counters.";
      }

      leaf number-intervals-stored {

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        type uint32 {
          range "2..10";
        }
        default 10;
        description
          "This object specifies the number of completed
           measurement intervals to store in the history statistics
           table.";
      }

      leaf availability-measurement-interval {
        type uint32 {
          range "1..525600";
        }
        units minutes;
        default 15;
        description
          "This object specifies the availability measurement
           interval in minutes. Measurement interval of 15 minutes
           MUST be supported, other intervals can be supported.";
      }

      leaf availability-consecutive-intervals-number {
        type uint32 {
          range "1..1000";
        }
        default 10;
        description
          "This object specifies a configurable number of
           consecutive availability indicators to be used to
           determine a change in the availability status as
           indicated by MEF 10.2.1.

           This parameter is equivalent to the Availability
           parameter 'n' as specified by MEF 10.2.1. The number
           range of 1 through 10 MUST be supported. The number
           range of 1 through 1000 may be supported, but is not
           mandatory.";
      }

      leaf session-type {
        type enumeration {
          enum proactive {
            description
              "The current session is 'proactive'.";
          }
          enum on-demand {
            description

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              "The current session is on-demand.";
          }
        }
        description
          "This object indicates whether the current session is
           defined to be proactive or on-demand.";
      }

      list thresholds {
        key "id";
        description
          "This list contains the list of Loss Measurement
           configuration threshold values for LM Performance
           Monitoring. The main purpose of the threshold
           configuration list is to configure threshold alarm
           notifications indicating that a specific performance
           metric is not being met.";

        leaf id {
          type uint32;
          description
            "The index of the threshold number for the specific LM
             threshold entry. An index value of '1' MUST be
             supported. Other index values can also be supported.";
        }

        container enabled-thresholds {
          leaf forward-unavailable-count {
            type boolean;
            description
              "If true, indicates that the forward-unavailable-count
                is available.";
          }
          leaf forward-available-ratio {
            type boolean;
            description
              "If true, indicates that the forward-available-ratio
               is available.";
          }
          leaf backward-unavailable-count {
            type boolean;
            description
              "If true, indicates that the backward-unavailable-count
               is available.";
          }
          leaf backward-available-ratio {
            type boolean;
            description

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              "If true, indicates that the backward-available-ratio
               is available.";
          }
          description
            "A container that indicates the type of OAM loss
             measurement threshold notifications that are enabled.";
        }
        /* Terminates container enabled-thresholds */

        leaf forward-unavailable-count {
          type uint32;
          description
            "This object is used to set the forward unavailability
             threshold value that will be used to determine if a
             threshold notification is generated.";
        }
        leaf backward-unavailable-count {
          type uint32;
          description
            "This object is used to set the backward unavailability
             threshold value that will be used to determine if a
             threshold notification is generated.";
        }
        leaf forward-available-ratio {
          type uint32 {
            range "0..100000";
          }
          units milli-percent;
          default 0;

          description
            "This object is used to set the forward
             availability/total time ratio threshold value that will
             be used to determine if a threshold notification is
             generated if the ratio drops below the configured value.
             The ratio value is expressed as a percent with a value
             of 0 (ratio 0.00) through 100000 (ratio 1.00) Units are
             in milli-percent, where 1 indicates 0.001 percent.";
        }
        leaf backward-available-ratio {
          type uint32 {
            range "0..100000";
          }
          units milli-percent;
          default 0;
          description
            "This object is used to set the backward
             availability/total time ratio threshold value that will

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             be used to determine if a thresh-old notification is
             generated if the ratio drops below the configured value.
             The ratio value is expressed as a percent with a value
             of 0 (ratio 0.00) through 100000 (ratio 1.00) Units are
             in milli-percent, where 1 indicates 0.001 percent.";
        }
      }
      /* This terminates list thresholds */
    }
    /* This terminates loss-measurement-configuration-group */

    grouping loss-stats-group {
      description
        "This grouping includes statistics objects for a loss
         measurement session.";
      leaf suspect-status {
        type boolean;
        description
            "true means statistics for this measurement interval are
             not valid.";
      }
    }

    grouping measurement-timing-group {
      description
        "This grouping includes objects used for proactive and
         on-demand scheduling of PM measurement sessions.";

      container start-time {
        description
          "This container defines the session start time.";

        choice start-time {
          description
            "Measurement session start time can be immediate,
             relative, or absolute.";

          container immediate {
            description
              "Start the measurement session immediately.";
          }

          leaf relative {
         type yang:timeticks;
          description
         "This object specifies the relative start time.";
         }
          leaf absolute {

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            type yang:date-and-time;
            description
              "This object specifies the scheduled start time to
               perform the on-demand monitoring operations.";
          }
        }
      }

      container stop-time {
        description
          "This container defines the session stop time.";

        choice stop-time {
          description
            "Measurement session stop time can be none, or
             absolute.";

          container none {
            description
              "Never end the measurement session.";
          }

          leaf absolute {
            type yang:date-and-time;
            description
              "This object specifies the scheduled stop time
               to perform the on-demand monitoring operations.";
          }
        }
      }
    }
    /* End of measurement-timing-group */

    grouping delay-measurement-configuration-group {
      description
        "This grouping includes configuration objects for Delay
         Measurement function defined in PM.";
      reference
        "draft-wang-lime-yang-pm";

      container measurement-type {
        description
          "This container defines the measurement type.";

        leaf dmm {
          type boolean;
          description
            "If true, generate DMM Message, correlate with DMR

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             responses.";
        }
        leaf dm1-transmitted {
          type boolean;
          description
            "If true, generate 1DM Message.";
        }
        leaf dm1-received {
          type boolean;
          description
            "Receive 1DM PDU and generate measurement.";
        }
      }

      container measurement-enable {
        description
          "Indicates the types of DM counters that are enabled. Not
           all DM counters are supported for all DM types.";
      }

      leaf message-period {
        type uint32;
        default 100;
        description
          "This object specifies the interval between delay
            measurement OAM message transmissions.";
      }

      leaf data-pattern {
        type enumeration {
          enum zeroes {
            description "Indicates the Data TLV contains all 0s.";
          }
          enum ones {
            description "Indicates the Data TLV contains all 1s.";
          }
        }
        default zeroes;
        description
          "This object specifies the delay measurement data pattern
           included in the OAM packet.";
      }

      leaf measurement-interval {
        type uint32;
        units minutes;
        default 15;

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        description
          "This object specifies a Measurement Interval in minutes.";
      }

      leaf number-intervals-stored {
        type uint32 {
          range "2..10";
        }
        default 10;
        description
          "This object specifies the number of completed measurement
           intervals to store in the history statistics table.";
      }

      leaf session-type {
        type enumeration {
          enum proactive {
            description
              "The current session is 'proactive'.";
          }
          enum on-demand {
            description
              "The current session is on-demand.";
          }
        }
        description
          "This object indicates whether the current session is
           defined to be proactive or on-demand.";
      }
    }
    /* End of delay-measurement-configuration-group */

    grouping delay-measurement-stats-group {
      description
        "This grouping includes statistics objects for a delay
         measurement session.";

      leaf suspect-status {
        type boolean;
        description
          "true means statistics for this measurement interval are
           not valid.";
      }
    }
    /* End of delay-measurement-stats-group */

/*This set of data definitions defines the role of MEP.*/
    augment "/goam:domains/goam:domain"

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      +"/goam:MAs/goam:MA/goam:MEP" {
        description
          "This set of data definitions extends the MEP as described
           in goam";

        leaf delay-responder {
          type boolean;
          default true;
          description
            "This object specifies whether Delay Measurement (DMM)
             single ended Responder is enabled. The value 'false'
             indicates the Delay measurement responder is disabled
             and received DMM will be discarded.";
        }
        leaf loss-responder {
          type boolean;
          default true;
          description
            "This object specifies whether Loss Measurement (LMM)
             single ended Responder is enabled. The value 'false'
             indicates the Loss measurement responder is disabled and
             received LMM will be discarded.";

        }
    }

/*This set of data definitions defines performance measurement */
/*configuration.*/
    augment "/goam:domains/goam:domain"
      +"/goam:MAs/goam:MA/goam:MEP" {
        description
          "This set of data definitions extends the MEP as described
           in goam, specially with regard to delay measurements.";

        container delay-measurements {
          if-feature delay-measurements;
            description
              "This container contains a collection of data
               definitions related to Delay Measurements as defined
               in PM.";

          list delay-measurements {
            key "session-cookie";
            config false;
            description
              "List of Delay Measurement PM Sessions where each
               instance is uniquely identified by an session-cookie

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               attribute.";

            leaf session-cookie {
              type uint32;
              config false;
              description
                "cookie to identify delay measurement session.";
            }

            leaf id {
              type string;
              description
                "This object uniquely identifies a scheduled
                 measurement time.";
            }

            leaf status {
              type boolean;
              config false;
              description
                "This object indicates DM session status, true means
                 active, false means not active.";
            }
          }
          /* End of list delay-measurements */

          uses delay-measurement-configuration-group;
          uses measurement-timing-group;

          container current-stats {
            description
              "This container contains result of the current
               Measurement Interval in a delay measurement
               session gathered during the interval indicated by
               measurement-interval.";

            leaf start-time {
              type yang:date-and-time;
              description
                "Start time for current measurement interval.";
            }

            leaf elapsed-time {
              type uint32;
              units "tens of ms";
              description
                "Elapsed time for current measurement interval in
                 0.01 seconds.";

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            }

              uses delay-measurement-stats-group;
          }
          /* End of current-stats */

          list history-stats {
            key id;
            description
              "This list contains the result for historic measurement
               intervals for performance measurement session.";

            leaf id {
              type uint32;
              description
                "This id can be used to identify different history
                 stats.";
            }

            leaf start-time {
              type yang:date-and-time;
              description
                "Start time for measurement interval.";
            }

            leaf elapsed-time {
              type uint32;
              units "tens of ms";
              description
                "Elapsed time for measurement interval in 0.01
                 seconds.";
             }

            uses delay-measurement-stats-group;
          }
          /* End of history-stats */
        }
        /* End of container delay-measurements */
    }
    /* End of augment clause */

    augment "/goam:domains/goam:domain"
      +"/goam:MAs/goam:MA/goam:MEP" {
        description
          "This set of data definitions extends the MEP as described
           in goam, specially with regards to loss measurements.";

        container loss-measurements {

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          if-feature loss-measurements;
          description
            "This container contains a collection of data definitions
             related to loss measurements as defined in this document.";

          list loss-measurements {
            key "session-cookie";
            config false;
            description
              "List of Loss Measurement PM Sessions where each
               instance is uniquely identified by an session-cookie
               attribute.";

            leaf session-cookie {
              type uint32;
              config false;
              description
                "Cookie to identify loss measurement session.";
            }

            leaf id {
              type string;
              description
                "This object uniquely identifies a scheduled measurement
                 time.";
            }

            leaf status {
              type boolean;
              config false;
              description
                "This object indicates loss measurement session status,
                 true means active, false means not active.";
            }
          }
          /* End of list loss-measurements */

          uses loss-measurement-configuration-group;
          uses measurement-timing-group;

          leaf availability-forward-status {
            type enumeration {
              enum available {
                description
                  "Indicates the MEP is available.";
              }
              enum unavailable {
                description

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                  "Indicates the MEP is unavailable.";
              }
              enum unknown {
                description
                  "Indicates the availability is not known.";
              }
            }
            description
              "This object indicates the availability status in the
               forward direction.";
          }
          leaf availability-backward-status {
            type enumeration {
              enum available {
                description
                  "Indicates the MEP is available.";
              }
              enum unavailable {
                description
                  "Indicates the MEP is unavailable.";
              }
              enum unknown {
                description
                  "Indicates the availability is not known.";
              }
            }
            description
              "This object indicates the availability status
               in the backward direction.";
          }

          container current-stats {
            description
              "This container contains result of the current
               measurement interval in a PM loss measurement session
               gathered during the interval indicated by
               measurement-interval.";

            leaf start-time {
              type yang:date-and-time;
              description
                "Start time for current measurement interval.";
            }

            leaf elapsed-time {
              type uint32;
              units "tens of ms";
              description

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              "Elapsed time for current measurement
                         interval in 0.01 seconds.";
            }
            leaf forward-available {
              type yang:gauge32;
              description
                "The current value of forward-available for the
                 referenced loss measurement session.";
            }
            leaf backward-available {
              type yang:gauge32;
              description
                "The current value of backward-available for the
                 referenced loss measurement session.";
            }
            leaf forward-unavailable {
            type yang:gauge32;
            description
              "The current value of forward-unavailable for the
               referenced loss measurement session.";
            }
            leaf backward-unavailable {
              type yang:gauge32;
              description
                "The current value of backward-unavailable for the
                 referenced loss measurement session.";
            }
            uses loss-stats-group;
          }
          /* End of container current-stats */

          list history-stats {
            key id;
            description
              "This list contains the result for historic measurement
               intervals for PM loss measurement session.";

            leaf id {
              type uint32;
              description
                "This leaf can be used to select different
                 history-stats intervals.";
            }

            leaf start-time {
              type yang:date-and-time;
              description
                "Start time for measurement interval.";

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            }

            leaf elapsed-time {
              type uint32;
              units "tens of ms";
              description
                "Elapsed time for measurement interval in 0.01
                 seconds.";
            }
            leaf forward-available {
              type yang:gauge32;
              description
                "The value of forward-available for the
                 referenced loss measurement session and interval.";
            }
            leaf backward-available {
              type yang:gauge32;
              description
                "The value of backward-available for the
                 referenced loss measurement session and interval.";
            }
            leaf forward-unavailable {
              type yang:gauge32;
              description
                "The value of forward-unavailable for the
                 referenced loss measurement session and interval.";
            }
            leaf backward-unavailable {
              type yang:gauge32;
              description
                "The value of backward-unavailable for the
                 referenced loss measurement session and interval.";
            }
            uses loss-stats-group;
          }
          /* End of list history-stats */
        }
        /* End of container loss-measurements */
    }
    /* End of augments clause */

           //RPCs related to Generic PM
    rpc create-loss-measurement {
      if-feature create-loss-measurement;
      description
      "Schedule a one-way or two-way on-demand or proactive
       performance monitoring loss measurement session on a specific
       MEP and flow.

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       A list entry associated with the newly created session will be
       created in the loss-measurements container and the assigned
       session identifier will be returned in the output parameter.";

      input {
        uses loss-measurement-configuration-group;
        uses measurement-timing-group;

        container destination-mep {
          uses goam:mp-address;
          uses goam:MEP-ID;
        }
      }
      output {
        leaf session-id {
          type uint32;
          mandatory true;
          description
            "The session identifier of the newly created loss
             measurement session.";
        }
      }
    } //end of rpc

    rpc abort-loss-measurement {
      if-feature abort-delay-measurement;
      description
        "Abort a currently running or scheduled single-ended
         on-demand PM loss measurement function.";

      input {
        uses goam:maintenance-domain-id;
        uses goam:ma-identifier;

        container destination-mep {
          uses goam:mp-address;
          uses goam:MEP-ID;
        }
        leaf session-id {
          type uint32;
          mandatory true;
          description
            "The session Id of the measurement session to
             be aborted.";
        }
      }
    } //end of RPC

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    rpc create-delay-measurement {
      if-feature create-delay-measurement;
      description
        "Schedule a one-way or two-way on-demand or proactive
         performance monitoring delay measurement session on a
         specific MEP and flow. A list entry associated with the
         newly created session will be created in the
         delay-measurements container and the assigned session
         identifier will be returned in the output parameter.";

      input {
        uses delay-measurement-configuration-group;
        uses measurement-timing-group;

        container destination-mep {
          uses goam:mp-address;
          uses goam:MEP-ID;
        }
        uses goam:flow-entropy;
      }

      output {
        leaf session-id {
        type uint32;
        mandatory true;
        description
          "The session identifier of the newly created
           delay measurement session.";
        }
      }
    } //end of rpc

    rpc abort-delay-measurement {
      if-feature abort-delay-measurement;
      description
        "Abort a currently running or scheduled single-ended
         on-demand PM function.";

      input {
        uses goam:maintenance-domain-id;
        uses goam:ma-identifier;

        container destination-mep {
          uses goam:mp-address;
          uses goam:MEP-ID;
        }

        leaf session-id {

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          type uint32;
          mandatory true;
          description
            "The session Id of the measurement session to
             be aborted.";
        }
      }
    } //end of RPC
  }
<CODE ENDS>

6.  Open Issues

   o  Why abort-loss-measurement rpc put the restriction to on-demand?

   o  Can abort-delay-measurement rpc be used to abort scheduled delay
      measurement session?

7.  Security Considerations

   TBD.

8.  IANA Considerations

   TBD.

9.  References

9.1.  Normative References

   [GENYANGGOAM]
              Senevirathne , T., Finn, N., Kumar, D., Salam, S., Wu, Q.,
              and Z. Wang, "Generic YANG Data Model for Operations,
              Administration, and Maintenance (OAM)", ID
              https://datatracker.ietf.org/doc/draft-tissa-lime-yang-
              oam-model/, June 2015.

   [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.

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9.2.  Informative References

   [IEEE802.1Q]
              "Media Access Control (MAC) Bridges and Virtual Bridged
              Local Area Networks", IEEE Std 802.1Q-2011, August 2011.

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

   [RFC6291]  Andersson, L., van Helvoort, H., Bonica, R., Romascanu,
              D., and S. Mansfield, "Guidelines for the Use of the "OAM"
              Acronym in the IETF", BCP 161, RFC 6291, June 2011.

   [RFC6371]  Busi, I. and D. Allan, "Operations, Administration, and
              Maintenance Framework for MPLS-Based Transport Networks",
              RFC 6371, September 2011.

   [RFC7174]  Salam, S., Senevirathne, T., Aldrin, S., and D. Eastlake,
              "Transparent Interconnection of Lots of Links (TRILL)
              Operations, Administration, and Maintenance (OAM)
              Framework", RFC 7174, May 2014.

Authors' Addresses

   Zitao Wang
   Huawei Technologies,Co.,Ltd
   101 Software Avenue, Yuhua District
   Nanjing  210012
   China

   Email: wangzitao@huawei.com

   Qin Wu
   Huawei
   101 Software Avenue, Yuhua District
   Nanjing, Jiangsu  210012
   China

   Email: bill.wu@huawei.com

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   Deepak Kumar
   CISCO Systems
   510 McCarthy Blvd
   Milpitas, CA  95035
   USA

   Email: dekumar@cisco.com

   Tom Taylor
   PT Taylor Consulting
   Ottawa
   Canada

   Email: tom.taylor.stds@gmail.com

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