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Versions: (draft-kumar-lime-yang-connectionless-oam) 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 RFC 8532

Network Working Group                                           D. Kumar
Internet-Draft                                                     Cisco
Intended status: Standards Track                                 M. Wang
Expires: April 26, 2018                                            Q. Wu
                                                                  Huawei
                                                               R. Rahman
                                                             S. Raghavan
                                                                   Cisco
                                                        October 23, 2017


      Generic YANG Data Model for Operations, Administration, and
         Maintenance(OAM) protocols for Connectionless networks
               draft-ietf-lime-yang-connectionless-oam-13

Abstract

   This document presents a base YANG Data model for connectionless
   Operations Administration, and Maintenance(OAM) protocols.  It
   provides a technology-independent abstraction of key OAM constructs
   for connectionless protocols.  The base model presented here can be
   extended to include technology specific details.  This is leading to
   uniformity between OAM protocols and support both nested OAM
   workflows (i.e., performing OAM functions at different or same levels
   through a unified interface) and interacting OAM workflows ( i.e.,
   performing OAM functions at same levels through a unified interface).

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 https://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 April 26, 2018.








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Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Overview of the Connectionless OAM Model  . . . . . . . . . .   4
     3.1.  TP Address  . . . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Tools . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     3.3.  OAM neighboring test points . . . . . . . . . . . . . . .   6
     3.4.  Test Point Locations Information  . . . . . . . . . . . .   7
     3.5.  Test Point Locations  . . . . . . . . . . . . . . . . . .   7
     3.6.  Path Discovery Data . . . . . . . . . . . . . . . . . . .   7
     3.7.  Continuity Check Data . . . . . . . . . . . . . . . . . .   8
     3.8.  OAM data hierarchy  . . . . . . . . . . . . . . . . . . .   8
   4.  OAM YANG Module . . . . . . . . . . . . . . . . . . . . . . .  11
   5.  Connectionless model applicability  . . . . . . . . . . . . .  39
     5.1.  BFD Extension . . . . . . . . . . . . . . . . . . . . . .  39
       5.1.1.  Augment Method  . . . . . . . . . . . . . . . . . . .  39
       5.1.2.  Schema Mount  . . . . . . . . . . . . . . . . . . . .  42
     5.2.  LSP ping extension  . . . . . . . . . . . . . . . . . . .  44
       5.2.1.  Augment Method  . . . . . . . . . . . . . . . . . . .  44
       5.2.2.  Schema Mount  . . . . . . . . . . . . . . . . . . . .  45
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  47
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  49
   8.  Acknowlegements . . . . . . . . . . . . . . . . . . . . . . .  49
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  49
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  49
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  50
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  52







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1.  Introduction

   Operations, Administration, and Maintenance (OAM) are important
   networking functions that allow operators to:

   1.  Monitor networks connections (Reachability Verification,
       Continuity Check).

   2.  Troubleshoot failures (Fault verification and localization).

   3.  Monitor Performance

   An overview of OAM tools is presented at [RFC7276].

   Ping and Traceroute [RFC792], [RFC4443] are well-known fault
   verification and isolation tools, respectively, for IP networks.
   Over the years, different technologies have developed similar tools
   for similar purposes.

   The different OAM tools may support connection-oriented technologies
   or connectionless technologies.  In connection-oriented technologies,
   a connection is established prior to the transmission of data.  After
   connection is established, no additional control information such as
   signaling or operations and maintenance information is required to
   transmit the data.  In connectionless technologies, data is typically
   sent between end points without prior arrangement, but control
   information is required to identify destination.[G.800][RFC7276].
   Note that the Connection-Oriented OAM YANG DATA model is defined in
   [I-D.ietf-lime-yang-connection-oriented-oam-model].

   In this document, we presents a base YANG Data model for
   connectionless OAM protocols.  The generic YANG model for
   connectionless OAM only includes configuration data and state data.
   It can be used in conjunction with data retrieval method model
   [I-D.ietf-lime-yang-connectionless-oam-methods], which focuses on
   data retrieval procedures like RPC.  However it also can be used
   independently of data retrieval method model.

2.  Conventions used in this document

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

   o  client

   o  configuration data

   o  server



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   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.  Terminology

   TP - Test Point

   MAC - Media Access Control

   BFD - Bidirectional Forwarding Detection

   RPC - A Remote Procedure Call

   RPC operation - A specific Remote Procedure Call.

   CC - Continuity Check [RFC7276] , Continuity Checks are used to
   verify that a destination is reachable and therefore also referred to
   as reachability verification

3.  Overview of the Connectionless OAM Model

   The model is augmented to "/nd:networks/nd:network/nd:node"
   [I-D.ietf-i2rs-yang-network-topo] using 'test-point-locations'
   defined in Section 3.5.  The tool attribute 'tp-tools' grouping
   defined in this model is corresponding to technology-independent
   retrieval procedures (RPC operations) defined in
   [I-D.ietf-lime-yang-connectionless-oam-methods] and supports one of
   two basic types of activation: proactive and on-demand (determined by
   'session-type' grouping defined in this model, see section 3.2).

   At the top of the model, there is an 'cc-oper-data' container for
   session statistics.  Grouping is also defined for common session
   statistics and these are only applicable for proactive OAM sessions.

   Multiple 'test-point-locations' keyed using technology specific keys
   (eg., IPv4 address for IPv4 locations) are augmented into network
   nodes which are defined in [I-D.ietf-i2rs-yang-network-topo] to



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   describe the network hierarchies and the inventory of nodes contained
   in a network.  Each test point location under 'test-point-locations
   'grouping is chosen based on 'tp-location-type' leaf which when
   chosen, leads to a container that includes a list of 'test-point-
   locations' keyed by technology specific keys (e.g., 'ipv4-location'
   leaf ).  Each test point location under 'test-point-locations
   'grouping includes a 'test-point-location-info' grouping.  The 'test-
   point-location-info' grouping includes 'tp-technology' grouping, 'tp-
   tools' grouping, and 'connectionless-oam-tps' grouping.  The
   groupings of 'tp-address' and 'tp-address-ni' are kept out of 'test-
   point-location-info' grouping to make it addressing agnostic and
   allow varied composition.  Depending upon the choice of the 'tp-
   location-type' (determined by the 'tp-address-ni'), the containers
   differ in its composition of 'test- point-locations' while the 'test-
   point-location-info', is a common aspect of every 'test-point-
   locations'.  The 'tp-address-ni' grouping is used to describe the
   corresponding network instance.  The 'tp-technology'grouping indicate
   OAM technology details.  The 'tp-tools' grouping describe the OAM
   tools supported.  The 'connectionless-oam-tps' grouping is used to
   describe the relationship of one test point with other test points.
   The 'position' in 'oam-neighboring-tps' indicate relative position of
   neighboring test point corresponding to the current test point.

3.1.  TP Address

   In connectionless OAM, the TP address is defined with the following
   type:

   o  MAC address [RFC6136]

   o  IPv4 or IPv6 address

   o  TP-attribute

   o  System-id to represent the device or
      node.[I-D.ietf-spring-sr-yang]

   To define a forwarding treatment of a test packet, the 'tp-
   address'grouping needs to be associated with additional parameters,
   e.g.  DSCP for IP or EXP (renamed to Traffic Classic in RFC5462) for
   MPLS.  In generic connectionless OAM YANG model, these parameters are
   not explicit configured.  The model user can add corresponding
   parameters according to their requirements.








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3.2.  Tools

   The different OAM tools may be used in one of two basic types of
   activation: proactive and on-demand.  The proactive OAM refers to OAM
   actions which are carried out continuously to permit proactive
   reporting of fault.  The proactive OAM method requires persistent
   configuration.  The on-demand OAM refers to OAM actions which are
   initiated via manual intervention for a limited time to carry out
   diagnostics.  The on-demand OAM method requires only transient
   configuration.[RFC7276] [G.8013].  In connectionless OAM, 'session-
   type' grouping is defined to indicate which kind of activation will
   be used by the current session.

   In connectionless OAM, the tools attribute is used to describe a
   toolset for fault detection and isolation.  And it can serve as a
   constraint condition when the base model be extended to specific OAM
   technology.  For example, to fulfill the ICMP PING configuration, the
   "../coam:continuity-check" leaf should be set to "true", and then the
   lime base model should be augmented with ICMP PING specific details.

3.3.  OAM neighboring test points

   As typical networks have a multi-layer architecture, the set of OAM
   protocols similarly take a multi-layer structure; each layer may have
   its own OAM protocol [RFC7276] corresponding to a specific
   administrative domain and has associated test points.  OAM
   neighboring test points are referred to a list of neighboring test
   points in the same layer that are related to the current test point.
   This allows users to easily navigate between related neighboring
   layers to efficiently troubleshoot a defect.  In this model, the
   'position' leaf defines the relative position of the neighboring test
   point corresponding to the current test point in the same layer, and
   is provided to allow correlation of faults at different locations.
   If there is one neighboring test point placed before the current test
   point, the 'position' leaf is set to -1.  If there is one neighboring
   test point placed after the current test point, the 'position' leaf
   is set to 1.  If there is no neighboring test point placed before or
   after the current test point, the 'position' leaf is set to 0.













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                list oam-neighboring-tps {
                  key "index";
                  leaf index {
                     type uint16 {
                        range "0..65536";
                     }
                    description
                     "Index of a list of neighboring test points
                      in the same layer ";
                  }
                  leaf position {
                      type int8 {
                           range "-1..1";
                      }
                      description
                        "The relative position
                        of neighboring test point
                        corresponding to the current
                        test point";
                  }

                  description
                     "List of related neighboring test points in the same layer.";

              }

3.4.  Test Point Locations Information

   This is a generic grouping for Test Point Locations Information
   (i.e., test-point-location-info grouping).  It Provide details of
   Test Point Location using 'tp-technology','tp-tools' grouping, 'oam-
   neighboring-tps' grouping defined above.

3.5.  Test Point Locations

   This is a generic grouping for Test Point Locations.  'tp-location-
   type 'leaf is used to define locations types, for example 'ipv4-
   location-type', 'ipv6-location-type', etc.  Container is defined
   under each location type containing list keyed to test point address,
   Test Point Location Information defined in section above, and network
   instance name(e.g.,VRF instance name) if required.

3.6.  Path Discovery Data

   This is a generic grouping for path discovery data model that can be
   retrieved by any data retrieval methods including RPC operations.
   Path discovery data output from methods, includes 'src-test-point'
   container, 'dst-test-point' container, 'sequence-number'leaf, 'hop-



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   cnt'leaf, session statistics of various kinds, path verification and
   path trace related information.  Path discovery includes data to be
   retrieved on a 'per- hop' basis via a list of 'path-trace-info-
   list'list which includes information like 'timestamp'grouping, '
   ingress-intf-name ', ' egress-intf-name ' and 'app-meta-data'.  The
   path discovery data model is made generic enough to allow different
   methods of data retrieval.  None of the fields are made mandatory for
   that reason.  Noted that the retrieval methods are defined in
   [I-D.ietf-lime-yang-connectionless-oam-methods].

3.7.  Continuity Check Data

   This is a generic grouping for continuity check data model that can
   be retrieved by any data retrieval methods including RPC operations.
   Continuity check data output from methods, includes 'src-test-
   point'container, 'dst-test-point'container, 'sequence-number' leaf,
   'hop-cnt'leaf and session statistics of various kinds.  The
   continuity check data model is made generic enough to allow different
   methods of data retrieval.  None of the fields are made mandatory for
   that reason.  Noted that the retrieval methods are defined in
   [I-D.ietf-lime-yang-connectionless-oam-methods].

3.8.  OAM data hierarchy

   The complete data hierarchy related to the OAM YANG model is
   presented below.

   module: ietf-connectionless-oam
      +--ro cc-session-statistics-data {continuity-check}?
         +--ro cc-ipv4-sessions-statistics
         |  +--ro cc-session-statistics
         |     +--ro session-count?              uint32
         |     +--ro session-up-count?           uint32
         |     +--ro session-down-count?         uint32
         |     +--ro session-admin-down-count?   uint32
         +--ro cc-ipv6-sessions-statistics
            +--ro cc-session-statistics
               +--ro session-count?              uint32
               +--ro session-up-count?           uint32
               +--ro session-down-count?         uint32
               +--ro session-admin-down-count?   uint32
   augment /nd:networks/nd:network/nd:node:
      +--rw tp-location-type?                identityref
      +--rw ipv4-location-type
      |  +--rw test-point-ipv4-location-list
      |     +--rw test-point-locations* [ipv4-location ni]
      |        +--rw ipv4-location          inet:ipv4-address
      |        +--rw ni                     routing-instance-ref



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      |        +--rw (technology)?
      |        |  +--:(technology-null)
      |        |     +--rw tech-null?             empty
      |        +--rw tp-tools
      |        |  +--rw continuity-check    boolean
      |        |  +--rw path-discovery      boolean
      |        +--rw root?
      |        +--rw oam-neighboring-tps* [index]
      |           +--rw index                    uint16
      |           +--rw position?                int8
      |           +--rw (tp-location)?
      |              +--:(mac-address)
      |              |  +--rw mac-address-location?    yang:mac-address
      |              +--:(ipv4-address)
      |              |  +--rw ipv4-address-location?   inet:ipv4-address
      |              +--:(ipv6-address)
      |              |  +--rw ipv6-address-location?   inet:ipv6-address
      |              +--:(as-number)
      |              |  +--rw as-number-location?      inet:as-number
      |              +--:(system-id)
      |                 +--rw system-id-location?      router-id
      +--rw ipv6-location-type
      |  +--rw test-point-ipv6-location-list
      |     +--rw test-point-locations* [ipv6-location ni]
      |        +--rw ipv6-location          inet:ipv6-address
      |        +--rw ni                     routing-instance-ref
      |        +--rw (technology)?
      |        |  +--:(technology-null)
      |        |     +--rw tech-null?             empty
      |        +--rw tp-tools
      |        |  +--rw continuity-check    boolean
      |        |  +--rw path-discovery      boolean
      |        +--rw root?
      |        +--rw oam-neighboring-tps* [index]
      |           +--rw index                    uint16
      |           +--rw position?                int8
      |           +--rw (tp-location)?
      |              +--:(mac-address)
      |              |  +--rw mac-address-location?    yang:mac-address
      |              +--:(ipv4-address)
      |              |  +--rw ipv4-address-location?   inet:ipv4-address
      |              +--:(ipv6-address)
      |              |  +--rw ipv6-address-location?   inet:ipv6-address
      |              +--:(as-number)
      |              |  +--rw as-number-location?      inet:as-number
      |              +--:(system-id)
      |                 +--rw system-id-location?      router-id
      +--rw mac-location-type



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      |  +--rw test-point-mac-address-location-list
      |     +--rw test-point-locations* [mac-address-location]
      |        +--rw mac-address-location    yang:mac-address
      |        +--rw (technology)?
      |        |  +--:(technology-null)
      |        |     +--rw tech-null?              empty
      |        +--rw tp-tools
      |        |  +--rw continuity-check    boolean
      |        |  +--rw path-discovery      boolean
      |        +--rw root?
      |        +--rw oam-neighboring-tps* [index]
      |           +--rw index                    uint16
      |           +--rw position?                int8
      |           +--rw (tp-location)?
      |              +--:(mac-address)
      |              |  +--rw mac-address-location?    yang:mac-address
      |              +--:(ipv4-address)
      |              |  +--rw ipv4-address-location?   inet:ipv4-address
      |              +--:(ipv6-address)
      |              |  +--rw ipv6-address-location?   inet:ipv6-address
      |              +--:(as-number)
      |              |  +--rw as-number-location?      inet:as-number
      |              +--:(system-id)
      |                 +--rw system-id-location?      router-id
      +--rw group-as-number-location-type
      |  +--rw test-point-as-number-location-list
      |     +--rw test-point-locations* [as-number-location]
      |        +--rw as-number-location     inet:as-number
      |        +--rw ni?                    routing-instance-ref
      |        +--rw (technology)?
      |        |  +--:(technology-null)
      |        |     +--rw tech-null?             empty
      |        +--rw tp-tools
      |        |  +--rw continuity-check    boolean
      |        |  +--rw path-discovery      boolean
      |        +--rw root?
      |        +--rw oam-neighboring-tps* [index]
      |           +--rw index                    uint16
      |           +--rw position?                int8
      |           +--rw (tp-location)?
      |              +--:(mac-address)
      |              |  +--rw mac-address-location?    yang:mac-address
      |              +--:(ipv4-address)
      |              |  +--rw ipv4-address-location?   inet:ipv4-address
      |              +--:(ipv6-address)
      |              |  +--rw ipv6-address-location?   inet:ipv6-address
      |              +--:(as-number)
      |              |  +--rw as-number-location?      inet:as-number



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      |              +--:(system-id)
      |                 +--rw system-id-location?      router-id
      +--rw group-system-id-location-type
         +--rw test-point-system-info-location-list
            +--rw test-point-locations* [system-id-location]
               +--rw system-id-location     inet:uri
               +--rw ni?                    routing-instance-ref
               +--rw (technology)?
               |  +--:(technology-null)
               |     +--rw tech-null?             empty
               +--rw tp-tools
               |  +--rw continuity-check    boolean
               |  +--rw path-discovery      boolean
               +--rw root?
               +--rw oam-neighboring-tps* [index]
                  +--rw index                    uint16
                  +--rw position?                int8
                  +--rw (tp-location)?
                     +--:(mac-address)
                     |  +--rw mac-address-location?    yang:mac-address
                     +--:(ipv4-address)
                     |  +--rw ipv4-address-location?   inet:ipv4-address
                     +--:(ipv6-address)
                     |  +--rw ipv6-address-location?   inet:ipv6-address
                     +--:(as-number)
                     |  +--rw as-number-location?      inet:as-number
                     +--:(system-id)
                        +--rw system-id-location?      router-id

4.  OAM YANG Module

   <CODE BEGINS> file "ietf-connectionless-oam@2017-09-06.yang"

module ietf-connectionless-oam {
  yang-version 1.1;
  namespace "urn:ietf:params:xml:ns:yang:ietf-connectionless-oam";
  prefix cl-oam;
  import ietf-yang-schema-mount {
   prefix yangmnt;
  }
  import ietf-network {
    prefix nd;
  }
  import ietf-yang-types {
    prefix yang;
  }
  import ietf-interfaces {




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    prefix if;
  }
  import ietf-inet-types {
    prefix inet;
  }
  import ietf-network-instance {
    prefix ni;
  }
  import ietf-routing-types {
   prefix rt;
  }
  organization
    "IETF LIME Working Group";
  contact
    "Deepak Kumar dekumar@cisco.com
     Qin Wu bill.wu@huawei.com
     S Raghavan srihari@cisco.com
     Zitao Wang wangzitao@huawei.com
     R Rahman rrahman@cisco.com";
  description
    "This YANG module defines the generic configuration,
     data model, statistics for connectionless OAM to be
     used within IETF in a protocol independent manner.
     It is assumed that each protocol maps corresponding
     abstracts to its native format. Each protocol may
     extend the YANG model defined here to include protocol
     specific extensions";
  revision 2017-09-06 {
    description
      " Base model for Connectionless
       Operations, Administration,
       and Maintenance(OAM) ";
    reference
      " RFC XXXX: Connectionless
       Operations, Administration, and
       Maintenance(OAM)YANG Data Model";
  }
  feature connection-less {
    description
      "This feature indicates that OAM solution is connection less.";
  }
  feature continuity-check {
    description
      "This feature indicates that the server supports
       executing continuity check OAM command and
       returning a response. Servers that do not advertise
       this feature will not support executing
       continuity check command or rpc operation model for



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       continuity check command.";
  }
  feature path-discovery {
    description
      "This feature indicates that the server supports
       executing path discovery OAM command and
       returning a response. Servers that do not advertise
       this feature will not support executing
       path discovery command or rpc operation model for
       path discovery command.";
  }
  feature ptp-long-format {
    description
      "This feature indicates that timestamp is ptp long format.";
  }
  feature ntp-short-format {
    description
      "This feature indicates that timestamp is ntp short format.";
  }
  feature icmp-timestamp {
    description
      "This feature indicates that timestamp is icmp timestamp.";
  }
  typedef router-id {
    type yang:dotted-quad;
    description
      "A 32-bit number in the dotted quad format assigned to each
       router. This number uniquely identifies the router within an
       Autonomous System.";
  }
  typedef routing-instance-ref {
    type leafref {
      path "/ni:network-instances/ni:network-instance/ni:name";
    }
    description
      "This type is used for leafs that reference a routing instance
       configuration.";
  }
  identity address-attribute-types {
    description
      "This is base identity of address
       attribute types which are ip-prefix,
       bgp, tunnel, pwe3, vpls, etc.";
  }
  typedef address-attribute-type {
    type identityref {
      base address-attribute-types;
    }



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    description
      "Target address attribute type.";
  }
  identity time-interval-type {
    description
      "Time interval type";
  }
  identity hours {
    base time-interval-type;
    description
      "Time unit in Hours";
  }

  identity minutes {
    base time-interval-type;
    description
      "Time unit in Minutes";
  }
  identity seconds {
    base time-interval-type;
    description
      "Time unit in Seconds";
  }
  identity milliseconds {
    base time-interval-type;
    description
      "Time unit in Milliseconds";
  }
  identity microseconds {
    base time-interval-type;
    description
      "Time unit in Microseconds";
  }
  identity nanoseconds {
    base time-interval-type;
    description
      "Time unit in Nanoseconds";
  }

 identity timestamp-type {
  description
   "Base identity for Timestamp Type.";
 }
 identity truncated-ptp {
  base timestamp-type;
  description
   "Identity for 64bit short format PTP timestamp.";
 }



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 identity truncated-ntp {
  base timestamp-type;
  description
   "Identity for 32bit short format NTP timestamp.";
 }
 identity ntp64 {
  base timestamp-type;
  description
   "Identity for 64bit NTP timestamp.";
 }
 identity icmp {
  base timestamp-type;
  description

   "Identity for 32bit ICMP timestamp.";
 }
  grouping cc-session-statistics {
    description
      "Grouping for session statistics.";
    container cc-session-statistics {
      description
        "cc session counters";
      leaf session-count {
        type uint32;
        default "0";
        description
          "Number of Continuity Check sessions.
          A value of zero indicates that no session
          count is sent.";
      }
      leaf session-up-count {
        type uint32;
        default "0";
        description
          "Number of sessions which are up.
          A value of zero indicates that no up
          session count is sent.";
      }
      leaf session-down-count {
        type uint32;
        default "0";
        description
          "Number of sessions which are down.
         A value of zero indicates that no down
         session count is sent.";
      }
      leaf session-admin-down-count {
        type uint32;



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       default "0";
        description
          "Number of sessions which are admin-down.
          A value of zero indicates that no admin
          down session count is sent.";
      }
    }
  }
  grouping session-packet-statistics {
    description
      "Grouping for per session packet statistics";
    container session-packet-statistics {
      description
        "Per session packet statistics.";

      leaf rx-packet-count {
        type uint32{
            range "0..4294967295";
        }
        default "0";
        description
          "Total number of received OAM packet count.
           If the value is 4294967295,
          it indicates the packet count is overrun.";
      }
      leaf tx-packet-count {
        type uint32{
        range "0..4294967295";
        }
       default "0";
        description
          "Total number of transmitted OAM packet count.
           If the value is 4294967295,
           it indicates the packet count is overrun.";
      }
      leaf rx-bad-packet {
        type uint32 {
        range "0..4294967295";
        }
        default "0";
        description
          "Total number of received bad OAM packet.
           If the value is 4294967295,
           it indicates the bad packet count is overrun.";
      }
      leaf tx-packet-failed {
        type uint32 {
        range "0..4294967295";



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        }
        default "0";
        description
          "Total number of failed sending OAM packet.
          If the value is 4294967295, it indicates
          failed packet count is overrun.";
      }
    }
  }
  grouping cc-per-session-statistics {
    description
      "Grouping for per session statistics";
    container cc-per-session-statistics {
      description
        "per session statistics.";

      leaf create-time {
        type yang:date-and-time;
        description
          "Time and date when session is created.";
      }
      leaf last-down-time {
        type yang:date-and-time;
        description
          "Time and date last time session is down.";
      }
      leaf last-up-time {
        type yang:date-and-time;
        description
          "Time and date last time session is up.";
      }
      leaf down-count {
        type uint32 {
        range "0..4294967295";
        }
        default "0";
        description
          "Total Continuity Check sessions down count.
          If the value is 4294967295, it indicates down
          count is overrun.";
      }
      leaf admin-down-count {
        type uint32 {
        range "0..4294967295";
        }
        default "0";
        description
          "Total Continuity Check sessions admin down count.



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          If the value is 4294967295, it indicates admin
          down count is overrun.";
      }
      uses session-packet-statistics;
    }
  }
  grouping session-error-statistics {
    description
      "Grouping for per session error statistics";
    container session-error-statistics {
      description
        "Per session error statistics.";
      leaf packet-loss-count {
        type uint32 {
        range "0..4294967295";
        }
       default "0";
        description
          "Total received packet drops count.
          If the value is 4294967295, it indicates
          packet drops count is overrun.";
      }

          leaf loss-ratio{
                        type uint8{
                                range 0..100;
                        }
                description
                 "Loss ratio of the packets. Express as percentage
                 of packets lost with respect to packets sent.";
                }
      leaf packet-reorder-count {
        type uint32 {
        range "0..4294967295";
        }
        default "0";
        description
          "Total received packet reordered count.
          If the value is 4294967295, it indicates
          packet reorder count is overrun.";
      }
      leaf packets-out-of-seq-count {
        type uint32 {
        range "0..4294967295";
        }
        description
          "Total received out of sequence count.
           If the value is 4294967295, it indicates



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          out of sequence count is overrun.";
      }
      leaf packets-dup-count {
        type uint32 {
        range "0..4294967295";
        }
        description
          "Total received packet duplicates count.
          If the value is 4294967295, it indicates
          packet duplicates count is overrun.";
      }
    }
  }
  grouping session-delay-statistics {
    description
      "Grouping for per session delay statistics";
    container session-delay-statistics {
      description

        "Session delay summarised information.By default,
         one way measurement protocol (e.g., OWAMP)is used
         to measure delay. When two way measurement protocol
         (e.g., TWAMP) is used instead, it can be indicated
         using and protocol-id defined in RPC operation of
         draft-ietf-lime-yang-connectionless-oam-methods,i.e.,
         set protocol-id as OWAMP. Note that only one measurement
         protocol for delay is specified for interoperability reason.";
      leaf time-interval-value {
        type identityref {
          base time-interval-type;
        }
        default "milliseconds";
        description
          "Time units among choice of s,ms,ns etc.";
      }
      leaf min-delay-value {
        type uint32;
        description
          "Minimum delay value observed.";
      }
      leaf max-delay-value {
        type uint32;
        description
          "Maximum delay value observed.";
      }
      leaf average-delay-value {
        type uint32;
        description



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          "Average delay value observed.";
      }
    }
  }
  grouping session-jitter-statistics {
    description
      "Grouping for per session jitter statistics";
    container session-jitter-statistics {
      description
        "Session jitter summarised information. By default,
         jitter is measured using IP Packet Delay Variation
         (IPDV) as defined in RFC3393. When the other measurement
         method is used instead(e.g.,Packet Delay Variation used in
         Y.1540, it can be indicated using protocol-id-meta-data
         defined in RPC operation of
         draft-ietf-lime-yang-connectionless-oam-methods. Note that
         only one measurement method for jitter is specified
         for interoperability reason.";
      leaf interval-value {

        type identityref {
          base time-interval-type;
        }
       default "milliseconds";
        description
          "Time units among choice of s,ms,ns etc.";
      }
      leaf min-jitter-value {
        type uint32;
        description
          "Minimum jitter value observed.";
      }
      leaf max-jitter-value {
        type uint32;
        description
          "Maximum jitter value observed.";
      }
      leaf average-jitter-value {
        type uint32;
        description
          "Average jitter value observed.";
      }
    }
  }
  grouping session-path-verification-statistics {
    description
      "Grouping for per session path verification statistics";
    container session-path-verification-statistics {



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      description
        "OAM per session path verification statistics.";
      leaf verified-count {
        type uint32 {
        range "0..4294967295";
        }
        description
          "Total number of OAM packets that
           went through a path as intended.
          A value of 4294967295 indicates that
          verified count is overrun.";
      }
      leaf failed-count {
        type uint32 {
        range "0..4294967295";
        }
        description
          "Total number of OAM packets that
           went through an unintended path.
          A value of 4294967295 indicates that

         failed count is overrun.";
      }
    }
  }
  grouping session-type {
    description
      "This object indicates which kind
      of activation will be used by the current
      session.";
    leaf session-type {
      type enumeration {
        enum "proactive" {
          description
            "The current session is proactive session.";
        }
        enum "on-demand" {
          description
            "The current session is on-demand session.";
        }
      }
      default "on-demand";
      description
        "Indicate which kind of activation will be used
         by the current session";
    }
  }
  identity tp-address-technology-type {



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    description
      "Test point address type";
  }
  identity mac-address-type {
    base tp-address-technology-type;
    description
      "MAC address type";
  }
  identity ipv4-address-type {
    base tp-address-technology-type;
    description
      "IPv4 address type";
  }
  identity ipv6-address-type {
    base tp-address-technology-type;
    description
      "IPv6 address type";
  }
  identity tp-attribute-type {
    base tp-address-technology-type;
    description

      "Test point attribute type";
  }
  identity system-id-address-type {
    base tp-address-technology-type;
    description
      "System id address type";
  }
  identity as-number-address-type {
    base tp-address-technology-type;
    description
      "AS number address type";
  }
  identity route-distinguisher-address-type {
    base tp-address-technology-type;
    description
      "Route Distinguisher address type";
  }
  grouping tp-address {
    leaf tp-location-type {
      type identityref {
        base tp-address-technology-type;
      }
      mandatory true;
      description
        "Test point address type.";
    }



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      container mac-address {
        when "derived-from-or-self(../tp-location-type, 'cl-oam:mac-address-type')" {
          description
            "MAC address type";
        }
        leaf mac-address {
          type yang:mac-address;
          mandatory true;
          description
            "MAC Address";
        }
        description
          "MAC Address based MP Addressing.";
      }
      container ipv4-address {
        when "derived-from-or-self(../tp-location-type, 'cl-oam:ipv4-address-type')" {
          description
            "IPv4 address type";
        }
        leaf ipv4-address {
          type inet:ipv4-address;
          mandatory true;

          description
            "IPv4 Address";
        }
        description
          "IP Address based MP Addressing.";
      }
      container ipv6-address {
        when "derived-from-or-self(../tp-location-type, 'cl-oam:ipv6-address-type')" {
          description
            "IPv6 address type";
        }
        leaf ipv6-address {
          type inet:ipv6-address;
          mandatory true;
          description
            "IPv6 Address";
        }
        description
          "ipv6 Address based MP Addressing.";
      }
      container tp-attribute {
        when "derived-from-or-self(../tp-location-type, 'cl-oam:tp-attribute-type')" {
          description
            "Test point attribute type";
        }



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        leaf tp-attribute-type {
          type address-attribute-type;
          description
            "Test point type.";
        }
        choice tp-attribute-value {
          description
            "Test point value.";
          case ip-prefix {
            leaf ip-prefix {
              type inet:ip-prefix;
              description
                "IP prefix.";
            }
          }
          case bgp {
            leaf bgp {
              type inet:ip-prefix;
              description
                "BGP Labeled Prefix ";
            }
          }
          case tunnel {

            leaf tunnel-interface {
              type uint32;
              description
                "VPN Prefix ";
            }
          }
          case pw {
            leaf remote-pe-address {
              type inet:ip-address;
              description
                "Remote pe address.";
            }
            leaf pw-id {
              type uint32;
              description
                "Pseudowire ID is a non-zero 32-bit ID.";
              reference
                "RFC 4379 :Detecting Multi-Protocol Label
                Switched (MPLS) Data Plane Failures";
            }
          }
          case vpls {
            leaf route-distinguisher {
              type rt:route-distinguisher;



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              description
                "Route Distinguisher is an 8 octets identifier
                used to distinguish information about various
                L2VPN advertised by a node.";
              reference
                "RFC 4379 :Detecting Multi-Protocol Label
                Switched (MPLS) Data Plane Failures";
            }
            leaf sender-ve-id {
              type uint16;
              description
                "Sender's VE ID. The VE ID (VPLS Edge Identifier)
                 is a 2-octet identifier.";
              reference
                "RFC 4379 :Detecting Multi-Protocol Label
                Switched (MPLS) Data Plane Failures";
            }
            leaf receiver-ve-id {
              type uint16;
              description
                "Receiver's VE ID.The VE ID (VPLS Edge Identifier)
                 is a 2-octet identifier.";
              reference
                "RFC 4379 :Detecting Multi-Protocol Label

                Switched (MPLS) Data Plane Failures";
            }
          }
          case mpls-mldp {
            choice root-address {
              description
                "Root address choice.";
              case ip-address {
                leaf source-address {
                  type inet:ip-address;
                  description
                    "IP address.";
                }
                leaf group-ip-address {
                  type inet:ip-address;
                  description
                    "Group ip address.";
                }
              }
              case vpn {
                leaf as-number {
                  type inet:as-number;
                  description



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                  "The AS number represents autonomous system
                  numbers which identify an Autonomous System.";
                }
              }
              case global-id {
                leaf lsp-id {
                  type string;
                  description
                    "LSP ID is an identifier of a LSP
                     within a MPLS network.";
                  reference
                  "RFC 4379 :Detecting Multi-Protocol Label
                   Switched (MPLS) Data Plane Failures";
                }
              }
            }
          }
        }
        description
           "Test Point Attribute Container";
      }
      container system-info {
        when "derived-from-or-self(../tp-location-type, 'cl-oam:system-id-address-type')" {
          description
            "System id address type";

        }
        leaf system-id {
          type rt:router-id;
          description
            "System ID assigned to this node.";
        }
        description
           "system ID container.";
      }
    description
      "TP Address";
  }
  grouping tp-address-ni {
    description
      "Test point address with VRF.";
    leaf ni {
      type routing-instance-ref;
      description
        "The ni is used to describe virtual resource partitioning
        that may be present on a network device.Example of common
        industry terms for virtual resource partitioning is VRF
        instance.";



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    }
    uses tp-address;
  }
  grouping connectionless-oam-tps {
    list oam-neighboring-tps {
      key "index";
      leaf index {
        type uint16{
        range "0..65535";
       }
        description
          "Index of a list of neighboring test points
           in the same layer";
      }
      leaf position {
        type int8 {
          range "-1..1";
        }
        default "0";
        description
          "The relative position
           of neighboring test point
           corresponding to the current
           test point.Level 0 indicates no neighboring
           test points placed before or after the current
           test point in the same layer.-1 means there is

           a neighboring test point placed before the current
           test point in the same layer and +1 means there is
           a neighboring test point placed after the current
           test point in same layer.";
      }
      choice tp-location {
        case mac-address {
          leaf mac-address-location {
            type yang:mac-address;
            description
              "MAC Address";
          }
          description
            "MAC Address based MP Addressing.";
        }
        case ipv4-address {
          leaf ipv4-address-location {
            type inet:ipv4-address;
            description
              "Ipv4 Address";
          }



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          description
            "IP Address based MP Addressing.";
        }
        case ipv6-address {
          leaf ipv6-address-location {
            type inet:ipv6-address;
            description
              "IPv6 Address";
          }
          description
            "IPv6 Address based MP Addressing.";
        }
        case as-number {
          leaf as-number-location {
            type inet:as-number;
            description
              "AS number location";
          }
          description
            "AS number for point to multipoint OAM";
        }
        case system-id {
          leaf system-id-location {
            type router-id;
            description
              "System id location";
          }

          description
            "System ID";
        }
        description
          "TP location.";
      }
      description
        "List of neighboring test points in the same layer that are related to current test
         point. If the neighboring test-point is placed after the current test point, the
         position is specified as +1. If neighboring test-point
         is placed before the current test point, the position is specified
         as -1, if no neighboring test points placed before or after the current
         test point in the same layer, the position is specified as 0.";
    }
    description
      "Connectionless OAM related neighboring test points list.";
  }
  grouping tp-technology {
    choice technology {
      default "technology-null";



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      case technology-null {
        description
          "This is a placeholder when no technology is needed.";
        leaf tech-null {
          type empty;
          description
            "There is no technology to be defined.";
        }
      }
      description
        "Technology choice.";
    }
    description
      "OAM Technology";
  }
  grouping tp-tools {
    description
      "Test Point OAM Toolset.";
    container tp-tools {
      leaf continuity-check {
        type boolean;
        mandatory true;
        description
          "A flag indicating whether or not the
           continuity check function is supported.";
        reference

          "RFC 792: INTERNET CONTROL MESSAGE PROTOCOL.
           RFC 4443: Internet Control Message Protocol (ICMPv6)
           for the Internet Protocol Version 6 (IPv6) Specification.
           RFC 5880: Bidirectional Forwarding Detection.
           RFC 5881: BFD for IPv4 and IPv6.
           RFC 5883: BFD for Multihop Paths.
           RFC 5884: BFD for MPLS Label Switched Paths.
           RFC 5885: BFD for PW VCCV.
           RFC 6450: Multicast Ping Protocol.
           RFC 8029: Detecting Multiprotocol Label Switched
          (MPLS) Data-Plane Failures.";
      }
      leaf path-discovery {
        type boolean;
        mandatory true;
        description
          "A flag indicating whether or not the
           path discovery function is supported.";
        reference
          "RFC 792: INTERNET CONTROL MESSAGE PROTOCOL.
           RFC 4443: Internet Control Message Protocol (ICMPv6)



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           for the Internet Protocol Version 6 (IPv6) Specification.
           RFC 4884: Extended ICMP to Support Multi-part Message.
           RFC 5837:Extending ICMP for Interface.
           and Next-Hop Identification.
           RFC 8029: Detecting Multiprotocol Label Switched (MPLS)
           Data-Plane Failures.";
      }
      description
        "Container for test point OAM tools set.";
    }
  }
  grouping test-point-location-info {
    uses tp-technology;
    uses tp-tools;
    anydata root {
      yangmnt:mount-point "root";
      description
        "Root for models supported per
         test point";
    }
    uses connectionless-oam-tps;
    description
      "Test point Location";
  }
  grouping test-point-locations {
    description
      "Group of test point locations.";

        leaf tp-location-type {
      type identityref {
        base tp-address-technology-type;
      }
      description
        "Test point location type.";
    }
      container ipv4-location-type {
        when "derived-from-or-self(../tp-location-type, 'cl-oam:ipv4-address-type')" {
          description
            "When test point location type is equal to ipv4 address.";
        }
        container test-point-ipv4-location-list {
          list test-point-locations {
            key "ipv4-location ni";
            leaf ipv4-location {
              type inet:ipv4-address;
              description
                "IPv4 Address.";
            }



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            leaf ni {
              type routing-instance-ref;
              description
                "The ni is used to describe the
                 corresponding network instance";
            }
            uses test-point-location-info;
            description
              "List of test point locations.";
          }
          description
            "Serves as top-level container
             for test point location list.";
        }
        description
           "ipv4 location type container.";
      }
      container ipv6-location-type {
        when "derived-from-or-self(../tp-location-type, 'cl-oam:ipv6-address-type')" {
          description
            "when test point location is equal to ipv6 address";
        }
        container test-point-ipv6-location-list {
          list test-point-locations {
            key "ipv6-location ni";
            leaf ipv6-location {
              type inet:ipv6-address;
              description

                "IPv6 Address.";
            }
            leaf ni {
              type routing-instance-ref;
              description
                "The ni is used to describe the
                 corresponding network instance";
            }
            uses test-point-location-info;
            description
              "List of test point locations.";
          }
          description
            "Serves as top-level container
             for test point location list.";
        }
        description
           "ipv6 location type container.";
      }



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      container mac-location-type {
        when "derived-from-or-self(../tp-location-type, 'cl-oam:mac-address-type')" {
          description
            "when test point location type is equal to mac address.";
        }
        container test-point-mac-address-location-list {
          list test-point-locations {
            key "mac-address-location";
            leaf mac-address-location {
              type yang:mac-address;
              description
                "MAC Address";
            }
            uses test-point-location-info;
            description
              "List of test point locations.";
          }
          description
            "Serves as top-level container
             for test point location list.";
        }
        description
           "mac address location type container.";
      }
container group-as-number-location-type {
when "derived-from-or-self(../tp-location-type, 'cl-oam:as-number-address-type')" {
     description
      "when test point location type is equal to as-number.";
}

        container test-point-as-number-location-list {
          list test-point-locations {
            key "as-number-location";
            leaf as-number-location {
              type inet:as-number;
              description
                "AS number for point to multi point OAM.";
            }
            leaf ni {
              type routing-instance-ref;
              description
                "The ni is used to describe the
                 corresponding network instance";
            }
            uses test-point-location-info;
            description
              "List of test point locations.";
          }



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          description
            "Serves as top-level container
             for test point location list.";
        }
        description
           "as number location type container.";
      }
container group-system-id-location-type {
when "derived-from-or-self(../tp-location-type, 'cl-oam:system-id-address-type')" {
  description
  "when test point location type is equal to system-info.";
}
        container test-point-system-info-location-list {
          list test-point-locations {
            key "system-id-location";
            leaf system-id-location {
              type inet:uri;
              description
                "System Id.";
            }
            leaf ni {
              type routing-instance-ref;
              description
                "The ni is used to describe the
                 corresponding network instance";
            }
            uses test-point-location-info;
            description
              "List of test point locations.";
          }

          description
            "Serves as top-level container for
             test point location list.";
        }
        description
           "system ID location type container.";
      }
  }
  augment "/nd:networks/nd:network/nd:node" {
    description
      "Augment test points of connectionless oam.";
        uses test-point-locations;
  }
  grouping timestamp {
    description
      "Grouping for timestamp.";
    leaf timestamp-type {



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      type identityref {
      base timestamp-type;
      }
      description
        "Type of Timestamp, such as Truncated PTP, NTP.";
    }
    container timestamp-64bit {
        when "derived-from-or-self(../timestamp-type, 'cl-oam:truncated-ptp')"+
       "or derived-from-or-self(../timestamp-type,'cl-oam:ntp64')" {
         description
          "Only applies when Truncated NTP or 64bit NTP Timestamp.";
        }
      leaf timestamp-sec {
      type uint32;
      description
        "Absolute timestamp in seconds as per IEEE1588v2
         or seconds part in 64-bit NTP timestamp.";
       }
      leaf timestamp-nanosec {
      type uint32;
      description
        "Fractional part in nanoseconds as per IEEE1588v2
         or Fractional part in 64-bit NTP timestamp.";
      }
      description
      "Container for 64bit timestamp.";
    }
    container timestamp-80bit {
        when "derived-from-or-self(../timestamp-type, 'cl-oam:ptp80')"{
         description
          "Only applies when 80bit PTP Timestamp.";

        }
  if-feature ptp-long-format;
      leaf timestamp-sec {
      type uint64 {
      range "0..281474976710656";
      }
      description
        "48bit Timestamp in seconds as per IEEE1588v2.";
       }
      leaf timestamp-nanosec {
      type uint32;
      description
        "Fractional part in nanoseconds as per IEEE1588v2
         or Fractional part in 64-bit NTP timestamp.";
      }
      description



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      "Container for 64bit timestamp.";
    }
       container ntp-timestamp-32bit {
        when "derived-from-or-self(../timestamp-type, 'cl-oam:truncated-ntp')"{
         description
          "Only applies when 32 bit NTP Short format Timestamp.";
        }
  if-feature ntp-short-format;
      leaf timestamp-sec {
      type uint16;
      description
        "Timestamp in seconds as per short format NTP.";
       }
      leaf timestamp-nanosec {
      type uint16;
      description
        "Truncated Fractional part in 16-bit NTP timestamp.";
      }
      description
      "Container for 64bit timestamp.";
    }
     container icmp-timestamp-32bit {
        when "derived-from-or-self(../timestamp-type, 'cl-oam:icmp-ntp')"{
         description
          "Only applies when Truncated NTP or 64bit NTP Timestamp.";
        }
  if-feature icmp-timestamp;
      leaf timestamp-millisec {
      type uint32;
      description
        "timestamp in milliseconds for ICMP timestamp.";
       }
      description
      "Container for 32bit timestamp.";
    }

  }
  grouping path-discovery-data {
    description
      "Path discovery related data output from nodes.";
    container src-test-point {
      description
        "Source test point.";
      uses tp-address-ni;
    }
    container dest-test-point {
      description
        "Destination test point.";



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      uses tp-address-ni;
    }
    leaf sequence-number {
      type uint64;
      default "0";
      description
        "Sequence number in data packets.A value of
        zero indicates that no sequence number is sent.";
    }
    leaf hop-cnt {
      type uint8;
      default "0";
      description
        "Hop count.A value of zero indicates
        that no hop count is sent";
    }
    uses session-packet-statistics;
    uses session-error-statistics;
    uses session-delay-statistics;
    uses session-jitter-statistics;
    container path-verification {
      description
        "Optional path verification related information.";
      leaf flow-info {
        type string;
        description
          "Informations that refers to the flow.";
      }
      uses session-path-verification-statistics;
    }
    container path-trace-info {
      description
        "Optional path trace per-hop test point information.
         The path trace information list has typically a single
         element for per-hop cases like path-discovery RPC operation
         but allows a list of hop related information for other types of

         data retrieval methods.";
      list path-trace-info-list {
        key "index";
        description
          "Path trace information list.";
        leaf index {
          type uint32;
          description
            "Trace information index.";
        }
        uses tp-address-ni;



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        uses timestamp;
        leaf ingress-intf-name {
          type if:interface-ref;
          description
            "Ingress interface name";
        }
        leaf egress-intf-name {
          type if:interface-ref;
          description
            "Egress interface name";
        }
        leaf queue-depth {
          type uint32;
          description
            "Length of the queue of the interface from where
             the packet is forwarded out.  The queue depth could
             be the current number of memory buffers used by the
             queue and a packet can consume one or more memory buffers
             thus constituting device-level information.";
        }
        leaf transit-delay {
          type uint32;
          description
            "Time in nano seconds
             packet spent transiting a node.";
        }
        leaf app-meta-data {
          type uint64;
          description
            "Application specific
             data added by node.";
        }
      }
    }
  }
  grouping continuity-check-data {
    description

      "Continuity check data output from nodes.";
    container src-test-point {
      description
        "Source test point.";
      uses tp-address-ni;
      leaf egress-intf-name {
        type if:interface-ref;
        description
          "Egress interface name.";
      }



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    }
    container dest-test-point {
      description
      "Destination test point.";
      uses tp-address-ni;
      leaf ingress-intf-name {
        type if:interface-ref;
        description
          "Ingress interface name.";
      }
    }
    leaf sequence-number {
      type uint64;
      default "0";
      description
       "Sequence number in data packets.A value of
       zero indicates that no sequence number is sent.";
    }
    leaf hop-cnt {
      type uint8;
      default "0";
      description
        "Hop count.A value of zero indicates
         that no hop count is sent";
    }
    uses session-packet-statistics;
    uses session-error-statistics;
    uses session-delay-statistics;
    uses session-jitter-statistics;
  }
  container cc-session-statistics-data {
    if-feature "continuity-check";
    config false;
    description
      "CC operational information.";
    container cc-ipv4-sessions-statistics {
      description
        "CC ipv4 sessions";

      uses cc-session-statistics;
    }
    container cc-ipv6-sessions-statistics {
      description
        "CC ipv6 sessions";
      uses cc-session-statistics;
    }
  }
}



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   <CODE ENDS>

5.  Connectionless model applicability

   "ietf-connectionless-oam" model defined in this document provides
   technology-independent abstraction of key OAM constructs for
   connectionless protocols.  This model can be further extended to
   include technology specific details, e.g., adding new data nodes with
   technology specific functions and parameters into proper anchor
   points of the base model, so as to develop a technology-specific
   connectionless OAM model.

   This section demonstrates the usability of the connectionless YANG
   OAM data model to various connectionless OAM technologies, e.g., BFD,
   LSP ping.  Note that, in this section, we only present several
   snippets of technology-specific model extensions for illustrative
   purposes.  The complete model extensions should be worked on in
   respective protocol working groups.

5.1.  BFD Extension

5.1.1.  Augment Method

   The following sections shows how the "ietf-connectionless-oam" model
   can be extended to cover BFD technology.  For this purpose, a set of
   extension are introduced such as technology-type extension and test-
   point attributes extension.

   Note that in BFD WG, there is a BFD YANG data model
   [I-D.ietf-bfd-yang] to be produced.  Users can choose to use "ietf-
   connectioless-oam" as basis and augment the "ietf-connectionless-oam"
   model with bfd specific details.  The bfd specific details can be the
   grouping defined in the BFD model.

5.1.1.1.  Technology type extension

   No BFD technology type has been defined in the "ietf-connectionless-
   oam" model.  Therefore a technology type extension is required in the
   model Extension.

   The snippet below depicts an example of augmenting "bfd" type into
   the ietf-connectionless-oam":









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   augment "/nd:networks/nd:network/nd:node/"
   +"coam:location-type/coam:ipv4-location-type"
   +"/coam:test-point-ipv4-location-list/"
   +"coam:test-point-locations/coam:technology"
   {
       leaf bfd{
      type string;
     }
   }

5.1.1.2.  Test point attributes extension

   To support bfd technology, the "ietf-connectionless-oam" model can be
   extended and add bfd specific parameters under "test-point-locations"
   list and/or add new location type such as "bfd over MPLS-TE" under
   "location-type".

5.1.1.2.1.  Define and insert new nodes into corresponding test-point-
            location

   In the "ietf-connectionless-oam" model, multiple "test-point-
   location" lists are defined under the "location-type" choice node.
   Therefore, to derive a model for some bfd technologies ( such as ip
   single-hop, ip multi-hops, etc), data nodes for bfd specific details
   need to be added into corresponding "test-point-locations" list.  In
   this section, we reuse some groupings which are defined in
   [I-D.ietf-bfd-yang] as following:

   The snippet below shows how the "ietf-connectionless-oam" model can
   be extended to support "BFD IP single-hop":





















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   augment "/nd:networks/nd:network/nd:node/"
   +"coam:location-type/coam:ipv4-location-type"
   +"/coam:test-point-ipv4-location-list/"
           +"coam:test-point-locations"
   {
           container session-cfg {
             description "BFD IP single-hop session configuration";
             list sessions {
               key "interface dest-addr";
               description "List of IP single-hop sessions";
               leaf interface {
                 type if:interface-ref;
                 description
                   "Interface on which the BFD session is running.";
               }
               leaf dest-addr {
                 type inet:ip-address;
                 description "IP address of the peer";
               }
               uses bfd:bfd-grouping-common-cfg-parms;
               uses bfd:bfd-grouping-echo-cfg-parms;
             }
           }
   }

   Similar augmentations can be defined to support other BFD
   technologies such as BFD IP multi-hop, BFD over MPLS, etc.

5.1.1.2.2.  Add new location-type cases

   In the "ietf-connectionless-oam" model, If there is no appropriate
   "location type" case that can be extended, a new "location-type" case
   can be defined and inserted into the "location-type" choice node.

   Therefore, the model user can flexibly add "location-type" to support
   other type of test point which are not defined in the "ietf-
   connectionless-oam" model.  In this section, we add a new "location-
   type" case and reuse some groupings which are defined in
   [I-D.ietf-bfd-yang] as follows:

   The snippet below shows how the "ietf-connectionless-oam" model can
   be extended to support "BFD over MPLS-TE":









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   augment "/nd:networks/nd:network/nd:node/coam:location-type"{
    case te-location{
     list test-point-location-list{
      key "tunnel-name";
      leaf tunnel-name{
       type leafref{
    path "/te:te/te:tunnels/te:tunnel/te:name";
   }
   description
   "point to a te instance.";
      }
       uses bfd:bfd-grouping-common-cfg-parms;
           uses bfd-mpls:bfd-encap-cfg;
     }
    }
   }

   Similar augmentations can be defined to support other BFD
   technologies such as BFD over LAG, etc.

5.1.2.  Schema Mount

   And another alternative method is using schema mount mechanism
   [I-D.ietf-netmod-schema-mount] in the "ietf-connectionless-oam".
   Within the "test-point-locations" list, a "root" attribute is defined
   to provide a mounted point for models mounted per "test-point-
   locations".  Therefore, the "ietf-connectionless-oam" model can
   provide a place in the node hierarchy where other OAM YANG data
   models can be attached, without any special extension in the "ietf-
   connectionless-oam" YANG data models [I-D.ietf-netmod-schema-mount].
   Note that the limitation of the Schema Mount method is it is not
   allowed to specify certain modules that are required to be mounted
   under a mount point.

   The snippet below depicts the definition of "root" attribute.

         anydata root {
          yangmnt:mount-point root;
          description
         "Root for models supported per
           test point";
         }

   The following section shows how the "ietf-connectionless-oam" model
   can use schema mount to support BFD technology.






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5.1.2.1.  BFD Modules be populated in schema-mount

   To support BFD technology, "ietf-bfd-ip-sh" and "ietf-bfd-ip-mh" YANG
   modules might be populated in the "schema-mounts" container:

      <schema-mounts
          xmlns="urn:ietf:params:xml:ns:yang:ietf-yang-schema-mount">
        <mount-point>
          <module> ietf-connectionless-oam </module>
          <name>root</name>
          <use-schema>
            <name>root</name>
          </use-schema>
        </mount-point>
        <schema>
          <name>root</name>
          <module>
            <name>ietf-bfd-ip-sh </name>
            <revision>2016-07-04</revision>
            <namespace>
              urn:ietf:params:xml:ns:yang:ietf-bfd-ip-sh
            </namespace>
            <conformance-type>implement</conformance-type>
          </module>
          <module>
            <name>ietf-bfd-ip-mh </name>
            <revision> 2016-07-04</revision>
            <namespace>
              urn:ietf:params:xml:ns:yang:ietf-bfd-ip-mh
            </namespace>
            <conformance-type>implement</conformance-type>
          </module>
        </schema>
      </schema-mounts>

   and the " ietf-connectionless-oam " module might have:















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   <ietf-connectionless-oam
   uri="urn:ietf:params:xml:ns:yang:ietf-connectionless-oam">
      ......
    <test-point-locations>
     <ipv4-location>192.0.2.1</ipv4-location>
      ......
     <root>
      <ietf-bfd-ip-sh uri="urn:ietf:params:xml:ns:yang:ietf-bfd-ip-sh">
       <ip-sh>
        foo
        ......
       </ip-sh>
      </ietf-bfd-ip-sh>
      <ietf-bfd-ip-mh uri="urn:ietf:params:xml:ns:yang:ietf-bfd-ip-mh">
       <ip-mh>
        foo
        ......
       </ip-mh>
      </ietf-bfd-ip-mh>
     </root>
    </test-point-locations>
   </ietf-connectionless-oam>

5.2.  LSP ping extension

5.2.1.  Augment Method

   The following sections shows how the "ietf-connectionless-oam" model
   can be extended to support LSP ping technology.  For this purpose, a
   set of extension are introduced such as technology-type extension and
   test-point attributes extension.

   Note that in MPLS WG, there is a LSP Ping YANG data model
   [I-D.zheng-mpls-lsp-ping-yang-cfg] to be produced.  Users can choose
   to use "ietf-connectioless-oam" as basis and augment the "ietf-
   connectionless-oam" model with LSP Ping specific details in the model
   extension.  The LSP Ping specific details can be the grouping defined
   in the LSP ping model.

5.2.1.1.  Technology type extension

   No lsp-ping technology type has been defined in the "ietf-
   connectionless-oam" model.  Therefore a technology type extension is
   required in the model extension.

   The snippet below depicts an example of augmenting the "ietf-
   connectionless-oam" with "lsp-ping" type:




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   augment "/nd:networks/nd:network/nd:node/"
   +"coam:location-type/coam:ipv4-location-type"
   +"/coam:test-point-ipv4-location-list/"
           +"coam:test-point-locations/coam:technology"
   {
      leaf lsp-ping{
      type string;
     }
   }

5.2.1.2.  Test point attributes extension

   To support lsp-ping, the "ietf-connectionless-oam" model can be
   extended and add lsp-ping specific parameters can be defined and
   under "test-point-locations" list.

   User can reuse the attributes or groupings which are defined in
   [I-D.zheng-mpls-lsp-ping-yang-cfg] as follows:

   The snippet below depicts an example of augmenting the "test-point-
   locations" list with lsp ping attributes:

   augment "/nd:networks/nd:network/nd:node/"
   +"coam:location-type/coam:ipv4-location-type"
   +"/coam:test-point-ipv4-location-list/"
           +"coam:test-point-locations"
   {
   list lsp-ping {
            key "lsp-ping-name";
            leaf lsp-ping-name {
             type string {
               length "1..31";
            }
           mandatory "true";
           description "LSP Ping test name.";
           ......
         }

5.2.2.  Schema Mount

   And another alternative method is using schema mount mechanism
   [I-D.ietf-netmod-schema-mount] in the "ietf-connectionless-oam".
   Within the "test-point-locations" list, a "root" attribute is defined
   to provide a mounted point for models mounted per "test-point-
   locations".  Therefore, the "ietf-connectionless-oam" model can
   provide a place in the node hierarchy where other OAM YANG data
   models can be attached, without any special extension in the "ietf-
   connectionless-oam" YANG data models [I-D.ietf-netmod-schema-mount].



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   Note that the limitation of the Schema Mount method is it is not
   allowed to specify certain modules that are required to be mounted
   under a mount point.

   The snippet below depicts the definition of "root" attribute.

         anydata root {
          yangmnt:mount-point root;
          description
         "Root for models supported per
           test point";
         }

   The following section shows how the "ietf-connectionless-oam" model
   can use schema mount to support LSP-PING technology.

5.2.2.1.  LSP-PING Modules be populated in schema-mount

   To support LSP-PING technology, "ietf-lspping" YANG module
   [I-D.zheng-mpls-lsp-ping-yang-cfg] might be populated in the "schema-
   mounts" container:

      <schema-mounts
          xmlns="urn:ietf:params:xml:ns:yang:ietf-yang-schema-mount">
        <mount-point>
          <module> ietf-connectionless-oam </module>
          <name>root</name>
          <use-schema>
            <name>root</name>
          </use-schema>
        </mount-point>
        <schema>
          <name>root</name>
          <module>
            <name>ietf-lspping </name>
            <revision>2016-03-18</revision>
            <namespace>
              urn:ietf:params:xml:ns:yang: ietf-lspping
            </namespace>
            <conformance-type>implement</conformance-type>
          </module>
        </schema>
      </schema-mounts>

   and the " ietf-connectionless-oam " module might have:






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   <ietf-connectionless-oam
   uri="urn:ietf:params:xml:ns:yang:ietf-connectionless-oam">
      ......
    <test-point-locations>
     <ipv4-location> 192.0.2.1</ipv4-location>
      ......
     <root>
      <ietf-lspping uri="urn:ietf:params:xml:ns:yang:ietf-lspping">
       <lsp-pings>
        foo
        ......
       </lsp-pings>
      </ietf-lspping>
     </root>
    </test-point-locations>
   </ietf-connectionless-oam>

6.  Security Considerations

   The YANG module defined in this document is designed to be accessed
   via network management protocols such as NETCONF [RFC6241] or
   RESTCONF [RFC8040].  The lowest NETCONF layer is the secure transport
   layer, and the mandatory-to-implement secure transport is Secure
   Shell (SSH) [RFC6242].  The lowest RESTCONF layer is HTTPS, and the
   mandatory-to-implement secure transport is TLS [RFC5246].

   The NETCONF access control model [RFC6536] provides the means to
   restrict access for particular NETCONF or RESTCONF users to a
   preconfigured subset of all available NETCONF or RESTCONF protocol
   operations and content.

   There are a number of data nodes defined in this YANG module that are
   writable/creatable/deletable (i.e., config true, which is the
   default).  These data nodes may be considered sensitive or vulnerable
   in some network environments.  Write operations (e.g., edit-config)
   to these data nodes without proper protection can have a negative
   effect on network operations.

   The vulnerable "config true" subtrees and data nodes are the
   following:

      /nd:networks/nd:network/nd:node/cl-oam:location-type/cl-oam:ipv4-
      location-type/cl-oam:test-point-ipv4-location-list/cl-oam:test-
      point-locations/

      /nd:networks/nd:network/nd:node/cl-oam:location-type/cl-oam:ipv6-
      location-type/cl-oam:test-point-ipv6-location-list/cl-oam:test-
      point-locations/



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      /nd:networks/nd:network/nd:node/cl-oam:location-type/cl-oam:mac-
      location-type/cl-oam:test-point-mac-address-location-list/cl-
      oam:test-point-locations/

      /nd:networks/nd:network/nd:node/cl-oam:location-type/cl-oam:group-
      as-number-location-type/cl-oam:test-point-as-number-location-list/
      cl-oam:test-point-locations/

      /nd:networks/nd:network/nd:node/cl-oam:location-type/cl-oam:group-
      system-id-location-type/cl-oam:test-point-system-info-location-
      list/cl-oam:test-point-locations/

   Unauthorized access to any of these lists can adversely affect OAM
   management system handling of end-to-end OAM and coordination of OAM
   within underlying network layers.  This may lead to inconsistent
   configuration, reporting, and presentation for the OAM mechanisms
   used to manage the network.

   Some of the readable data nodes in this YANG module may be considered
   sensitive or vulnerable in some network environments.  It is thus
   important to control read access (e.g., via get, get-config, or
   notification) to these data nodes.  These are the subtrees and data
   nodes and their sensitivity/vulnerability:

      /coam:cc-session-statistics-data/cl-oam:cc-ipv4-sessions-
      statistics/cl-oam:cc-session-statistics/cl-oam:session-count/

      /coam:cc-session-statistics-data/cl-oam:cc-ipv4-sessions-
      statistics/cl-oam:cc-session-statistics/cl-oam:session-up-count/

      /coam:cc-session-statistics-data/cl-oam:cc-ipv4-sessions-
      statistics/cl-oam:cc-session-statistics/cl-oam: session-down-
      count/

      /coam:cc-session-statistics-data/cl-oam:cc-ipv4-sessions-
      statistics/cl-oam:cc-session-statistics/cl-oam:session-admin-down-
      count/

      /coam:cc-session-statistics-data/cl-oam:cc-ipv6-sessions-
      statistics/cl-oam:cc-session-statistics/cl-oam:session-count/

      /coam:cc-session-statistics-data/cl-oam:cc-ipv6-sessions-
      statistics/cl-oam:cc-session-statistics/cl-oam:session-up-count//

      /coam:cc-session-statistics-data/cl-oam:cc-ipv6-sessions-
      statistics/cl-oam:cc-session-statistics/cl-oam:session-down-count/





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      /coam:cc-session-statistics-data/cl-oam:cc-ipv6-sessions-
      statistics/cl-oam:cc-session-statistics/cl-oam:session-admin-down-
      count/

7.  IANA Considerations

   This document registers a URI in the IETF XML registry [RFC3688].
   Following the format in [RFC3688] the following registration is
   requested to be made:

   URI: urn:ietf:params:xml:ns:yang:ietf-connectionless-oam

   Registrant Contact: The IESG.

   XML: N/A, the requested URI is an XML namespace.

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

   name: ietf-connectionless-oam

   namespace: urn:ietf:params:xml:ns:yang:ietf-connectionless-oam

   prefix: cl-oam

   reference: RFC XXXX

8.  Acknowlegements

   The authors of this document would like to thank Greg Mirsky and
   others for their sustainable review and comments, proposals to
   improve and stabilize document.

9.  References

9.1.  Normative References

   [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
              DOI 10.17487/RFC3688, January 2004,
              <https://www.rfc-editor.org/info/rfc3688>.

   [RFC4443]  Conta, A., Deering, S., and M. Gupta, Ed., "Internet
              Control Message Protocol (ICMPv6) for the Internet
              Protocol Version 6 (IPv6) Specification", STD 89,
              RFC 4443, DOI 10.17487/RFC4443, March 2006,
              <https://www.rfc-editor.org/info/rfc4443>.





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   [RFC5246]  Dierks, T. and E. Rescorla, "The Transport Layer Security
              (TLS) Protocol Version 1.2", RFC 5246,
              DOI 10.17487/RFC5246, August 2008,
              <https://www.rfc-editor.org/info/rfc5246>.

   [RFC6020]  Bjorklund, M., Ed., "YANG - A Data Modeling Language for
              the Network Configuration Protocol (NETCONF)", RFC 6020,
              DOI 10.17487/RFC6020, October 2010,
              <https://www.rfc-editor.org/info/rfc6020>.

   [RFC6241]  Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
              and A. Bierman, Ed., "Network Configuration Protocol
              (NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011,
              <https://www.rfc-editor.org/info/rfc6241>.

   [RFC6242]  Wasserman, M., "Using the NETCONF Protocol over Secure
              Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011,
              <https://www.rfc-editor.org/info/rfc6242>.

   [RFC6536]  Bierman, A. and M. Bjorklund, "Network Configuration
              Protocol (NETCONF) Access Control Model", RFC 6536,
              DOI 10.17487/RFC6536, March 2012,
              <https://www.rfc-editor.org/info/rfc6536>.

   [RFC6991]  Schoenwaelder, J., Ed., "Common YANG Data Types",
              RFC 6991, DOI 10.17487/RFC6991, July 2013,
              <https://www.rfc-editor.org/info/rfc6991>.

   [RFC7223]  Bjorklund, M., "A YANG Data Model for Interface
              Management", RFC 7223, DOI 10.17487/RFC7223, May 2014,
              <https://www.rfc-editor.org/info/rfc7223>.

   [RFC792]   Postel, J., "Internet Control Message Protocol", RFC 792,
              September 1981.

   [RFC8040]  Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
              Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017,
              <https://www.rfc-editor.org/info/rfc8040>.

9.2.  Informative References

   [G.800]    "Unified functional architecture of transport networks",
              ITU-T Recommendation G.800, 2016.

   [G.8013]   "OAM functions and mechanisms for Ethernet based
              networks", ITU-T Recommendation G.8013/Y.1731, 2013.





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   [I-D.ietf-bfd-yang]
              Rahman, R., Zheng, L., Jethanandani, M., Networks, J., and
              G. Mirsky, "YANG Data Model for Bidirectional Forwarding
              Detection (BFD)", draft-ietf-bfd-yang-06 (work in
              progress), June 2017.

   [I-D.ietf-i2rs-yang-network-topo]
              Clemm, A., Medved, J., Varga, R., Bahadur, N.,
              Ananthakrishnan, H., and X. Liu, "A Data Model for Network
              Topologies", draft-ietf-i2rs-yang-network-topo-17 (work in
              progress), October 2017.

   [I-D.ietf-lime-yang-connection-oriented-oam-model]
              Kumar, D., Wu, Q., and Z. Wang, "Generic YANG Data Model
              for Connection Oriented Operations, Administration, and
              Maintenance(OAM) protocols", draft-ietf-lime-yang-
              connection-oriented-oam-model-00 (work in progress), June
              2017.

   [I-D.ietf-lime-yang-connectionless-oam-methods]
              Kumar, D., Wang, Z., Wu, Q., Rahman, R., and S. Raghavan,
              "Retrieval Methods YANG Data Model for Connectionless
              Operations, Administration, and Maintenance(OAM)
              protocols", draft-ietf-lime-yang-connectionless-oam-
              methods-09 (work in progress), October 2017.

   [I-D.ietf-netmod-schema-mount]
              Bjorklund, M. and L. Lhotka, "YANG Schema Mount", draft-
              ietf-netmod-schema-mount-08 (work in progress), October
              2017.

   [I-D.ietf-spring-sr-yang]
              Litkowski, S., Qu, Y., Sarkar, P., and J. Tantsura, "YANG
              Data Model for Segment Routing", draft-ietf-spring-sr-
              yang-07 (work in progress), July 2017.

   [I-D.zheng-mpls-lsp-ping-yang-cfg]
              Zheng, L., Aldrin, S., Zheng, G., Mirsky, G., and R.
              Rahman, "Yang Data Model for LSP-PING", draft-zheng-mpls-
              lsp-ping-yang-cfg-05 (work in progress), June 2017.

   [RFC5462]  Andersson, L. and R. Asati, "Multiprotocol Label Switching
              (MPLS) Label Stack Entry: "EXP" Field Renamed to "Traffic
              Class" Field", RFC 5462, DOI 10.17487/RFC5462, February
              2009, <https://www.rfc-editor.org/info/rfc5462>.






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   [RFC6136]  Sajassi, A., Ed. and D. Mohan, Ed., "Layer 2 Virtual
              Private Network (L2VPN) Operations, Administration, and
              Maintenance (OAM) Requirements and Framework", RFC 6136,
              DOI 10.17487/RFC6136, March 2011,
              <https://www.rfc-editor.org/info/rfc6136>.

   [RFC7276]  Mizrahi, T., Sprecher, N., Bellagamba, E., and Y.
              Weingarten, "An Overview of Operations, Administration,
              and Maintenance (OAM) Tools", RFC 7276,
              DOI 10.17487/RFC7276, June 2014,
              <https://www.rfc-editor.org/info/rfc7276>.

Authors' Addresses

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

   Email: dekumar@cisco.com


   Michael 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


   Reshad Rahman
   Cisco Systems
   2000 Innovation Drive
   Kanata, Ontario  K2K 3E8
   Canada

   Email: rrahman@cisco.com



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   Srihari Raghavan
   Cisco Systems
   Tril Infopark Sez, Ramanujan IT City
   Neville Block, 2nd floor, Old Mahabalipuram Road
   Chennai, Tamil Nadu  600113
   India

   Email: srihari@cisco.com











































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