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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: August 27, 2017                                           Q. Wu
                                                                  Huawei
                                                               R. Rahman
                                                             S. Raghavan
                                                                   Cisco
                                                       February 23, 2017


 Generic YANG Data Model for Connectionless Operations, Administration,
                     and Maintenance(OAM) protocols
               draft-ietf-lime-yang-connectionless-oam-04

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).

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 August 27, 2017.

Copyright Notice

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




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

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Tree Diagrams . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Overview of the Connectionless OAM Model  . . . . . . . . . .   5
     3.1.  TP Address  . . . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Tools . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     3.3.  OAM-layers  . . . . . . . . . . . . . . . . . . . . . . .   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 . . . . . . . . . . . . . . . . . . . . . . .  17
   5.  Connectionless model applicability  . . . . . . . . . . . . .  47
     5.1.  BFD Extension . . . . . . . . . . . . . . . . . . . . . .  47
       5.1.1.  Augment Method  . . . . . . . . . . . . . . . . . . .  47
       5.1.2.  Schema Mount  . . . . . . . . . . . . . . . . . . . .  50
     5.2.  LSP ping extension  . . . . . . . . . . . . . . . . . . .  52
       5.2.1.  Technology type extension . . . . . . . . . . . . . .  52
       5.2.2.  Test point attributes extension . . . . . . . . . . .  53
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  53
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  55
   8.  Acknowlegements . . . . . . . . . . . . . . . . . . . . . . .  55
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  55
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  55
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  57
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  58

1.  Introduction

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

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



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   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.  In
   connectionless technologies, data is typically sent between end
   points without prior arrangement [RFC7276].  Note that the
   Connection-Oriented OAM YANG DATA model is defined in
   [I-D.ietf-lime-yang-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 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

   o  configuration data

   o  server

   o  state data

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

   o  augment



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   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, as used within the NETCONF protocol

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

2.2.  Tree Diagrams

   A simplified graphical representation of the data model is used in
   this document.  The meaning of the symbols in these diagrams is as
   follows:

   Each node is printed as:

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

   <status> is one of:
        +  for current



   <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>.



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   <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

3.  Overview of the Connectionless OAM Model

   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 applicable for proactive OAM sessions.
   Multiple 'test-point-locations' keyed using technology specific keys
   (eg., IPv4 address for IPv4 locations) are possible by augmented
   network nodes which are defined in [I-D.ietf-i2rs-yang-network-topo]
   to describe the network hierarchies and the inventory of nodes
   contained in a network.  Each 'test-point-location' is chosen based
   on 'location-type' which when chosen, leads to a container that
   includes a list of 'test-point-locations' keyed by technology
   specific keys.  Each test point location includes a 'test-point-
   location-info'.  The 'test-point-location-info' includes 'tp-
   technology', 'tp-tools', and 'connectionless-oam-layers'.  The
   groupings of 'tp-address' and 'tp-address-vrf' are kept out of 'test-
   point-location-info' to make it addressing agnostic and allow varied
   composition.  Depending upon the choice of the 'location-type'
   (determined by the 'tp-address-vrf'), the containers differ in its
   composition of 'test-point-locations' while the 'test-point-location-
   info', is a common aspect of every 'test-point-location'.  The vrf is
   used to describe the corresponding network instance.  The 'tp-
   technology' indicate OAM technology details.  The 'tp-tools' describe
   the OAM tools supported.  The 'connectionless-oam-layers' is used to
   describe the relationship of one test point with other test points.
   The level in 'oam-layers' indicate whether related OAM test point is
   The level in oam-layers indicate whether related oam test point is in
   client layer(lower layer described in section 3.3), server layer
   (upper layer described in section 3.3) or the same layer as the
   current test point under Test point Locations.  The model is
   augmented to "/nd:networks/nd:network/nd:node" using 'test-point-
   locations' defined below.

3.1.  TP Address

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

   o  MAC address [RFC6136]



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   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'
   needs to be associated with additional parameters, e.g.  DSCP for IP
   or TC 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.

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 on-demand OAM refers to OAM actions which
   are initiated via manual intervention for a limited time to carry out
   diagnostics [RFC7276] [G.8013].  In connectionless OAM, 'session-
   type' 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" should be set to "true", and then the lime
   base model should be augmented with ICMP PING specific details.

3.3.  OAM-layers

   As typical networks have a multi-layer architecture, the set of OAM
   protocols similarly take a multi-layer structure; each layer may has
   its own OAM protocol [RFC7276] and is corresponding to specific
   network portion or path and has associated test points.  OAM-layers
   is referred to a list of upper layer, lower layer that are related to
   current test point.  This allows users to easily navigate up and down
   to efficiently troubleshoot a "loss of continuity defect" at
   different layer.  In this model, we have kept level default as 0,
   when all test points are located at the same layer.  'Level' defines
   the relative technology level in a sequence of network portions, and
   is provided to allow correlation of faults in related OAM domains.
   For example, there is a network in which data traffic between two
   customer edges is transported over three consecutive network
   portions, the current test point is located in the second network
   portion.  If there is a defect in the first network portion is



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   located at the upstream of the second network portion, the level of
   the first network portion is set to "-1".  If the third network
   portion is located at the downstream of the second network portion
   and the level is set to "1".  In another case, if the first network
   portion and the third network portion is in the same level of the
   second network portion, the level is set to "0".  The snippet below
   depicts an example of OAM layers.

                list oam-layers {
                  key "index";
                  leaf index {
                     type uint16 {
                        range "0..65535";
                     }
                  }
                  leaf level {
                      type int32 {
                           range "-1..1";
                      }
                      description
                        "Level";
                  }
                  ordered-by user;
                  description
                     "List of related oam layers.";
                }

3.4.  Test Point Locations Information

   This is a generic grouping for Test Point Locations Information.  It
   Provide details of Test Point Location using Tools, 'OAM-Layers'
   grouping defined above.

3.5.  Test Point Locations

   This is a generic grouping for Test Point Locations.  Choice
   statement 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 routing
   instance VRF 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 RPCs.  Path
   discovery data output from methods, includes 'src-test-point', 'dst-
   test-point', 'sequence-number', 'hop-cnt', session statistics of



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   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' which includes information like
   'timestamps', 'ingress-interface', 'egress-interface' 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 RPCs.
   Continuity check data output from methods, includes 'src-test-point',
   'dst-test-point', 'sequence-number', 'hop-cnt' 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-oper-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-value?               identityref
    +--rw (location-type)?
       +--:(ipv4-location-type)
       |  +--rw test-point-ipv4-location-list
       |     +--rw test-point-locations* [ipv4-location]
       |        +--rw ipv4-location    inet:ipv4-address
       |        +--rw vrf?             routing-instance-ref



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       |        +--rw (technology)?
       |        |  +--:(technology-null)
       |        |  |  +--rw tech-null?       empty
       |        |  +--:(technology-string)
       |        |     +--rw ipv4-icmp?       string
       |        +--rw tp-tools
       |        |  +--rw connectivity-verification?   boolean
       |        |  +--rw continuity-check?            boolean
       |        |  +--rw path-discovery?              boolean
       |        +--rw root?
       |        +--rw oam-layers* [index]
       |           +--rw index                        uint16
       |           +--rw level?                       int32
       |           +--rw (tp-location)?
       |              +--:(mac-address)
       |              |  +--rw mac-address-location? yang:mac-address
       |              +--:(ipv4-address)
       |              |  +--rw ipv4-location?        inet:ipv4-address
       |              +--:(ipv6-location)
       |              |  +--rw ipv6-address          inet:ipv6-address
       |              +--:(tunnel-location)
       |              |  +--rw tunnel-location?      uint32
       |              +--:(ip-prefix-location)
       |              |  +--rw ip-prefix-location?   inet:ip-prefix
       |              +--:(route-dist-location)
       |              |  +--rw route-dist-location?  uint32
       |              +--:(group-ip-address-location)
       |              |  +--rw group-ip-address-location?   IP-Multicast
                                                       -Group-Address
       |              +--:(as-number-location)
       |              |  +--rw as-number-location    inet:as-number
       |              +--:(lsp-id-location)
       |              |  +--rw lsp-id-location?             string
       |              +--:(system-id-location)
       |                 +--rw system-id-location?          router-id
       +--:(ipv6-location-type)
       |  +--rw test-point-ipv6-location-list
       |     +--rw test-point-locations* [ipv6-location]
       |        +--rw ipv6-location    inet:ipv6-address
       |        +--rw vrf?             routing-instance-ref
       |        +--rw (technology)?
       |        |  +--:(technology-null)
       |        |  |  +--rw tech-null?       empty
       |        |  +--:(technology-string)
       |        |     +--rw ipv4-icmp?       string
       |        +--rw tp-tools
       |        |  +--rw connectivity-verification?   boolean
       |        |  +--rw continuity-check?            boolean



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       |        |  +--rw path-discovery?              boolean
       |        +--rw root?
       |        +--rw oam-layers* [index]
       |           +--rw index                        uint16
       |           +--rw level?                       int32
       |           +--rw (tp-location)?
       |              +--:(mac-address)
       |              |  +--rw mac-address-location?  yang:mac-address
       |              +--:(ipv4-address)
       |              |  +--rw ipv4-location?         inet:ipv4-address
       |              +--:(ipv6-location)
       |              |  +--rw ipv6-address?          inet:ipv6-address
       |              +--:(tunnel-location)
       |              |  +--rw tunnel-location?       uint32
       |              +--:(ip-prefix-location)
       |              |  +--rw ip-prefix-location?    inet:ip-prefix
       |              +--:(route-dist-location)
       |              |  +--rw route-dist-location?   uint32
       |              +--:(group-ip-address-location)
       |              |  +--rw group-ip-address-location?   IP-Multicast
                                                       -Group-Address
       |              +--:(as-number-location)
       |              |  +--rw as-number-location?        inet:as-number
       |              +--:(lsp-id-location)
       |              |  +--rw lsp-id-location?             string
       |              +--:(system-id-location)
       |                 +--rw system-id-location?          router-id
       +--:(mac-location-type)
       |  +--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
       |        |  +--:(technology-string)
       |        |     +--rw ipv4-icmp?              string
       |        +--rw tp-tools
       |        |  +--rw connectivity-verification?   boolean
       |        |  +--rw continuity-check?            boolean
       |        |  +--rw path-discovery?              boolean
       |        +--rw root?
       |        +--rw oam-layers* [index]
       |           +--rw index                        uint16
       |           +--rw level?                       int32
       |           +--rw (tp-location)?
       |              +--:(mac-address)
       |              |  +--rw mac-address-location?  yang:mac-address
       |              +--:(ipv4-address)



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       |              |  +--rw ipv4-location?         inet:ipv4-address
       |              +--:(ipv6-location)
       |              |  +--rw ipv6-address?          inet:ipv6-address
       |              +--:(tunnel-location)
       |              |  +--rw tunnel-location?       uint32
       |              +--:(ip-prefix-location)
       |              |  +--rw ip-prefix-location     inet:ip-prefix
       |              +--:(route-dist-location)
       |              |  +--rw route-dist-location?   uint32
       |              +--:(group-ip-address-location)
       |              |  +--rw group-ip-address-location?   IP-Multicast
                                                       -Group-Address
       |              +--:(as-number-location)
       |              |  +--rw as-number-location?        inet:as-number
       |              +--:(lsp-id-location)
       |              |  +--rw lsp-id-location?           string
       |              +--:(system-id-location)
       |                 +--rw system-id-location?        router-id
       +--:(tunnel-location-type)
       |  +--rw test-point-tunnel-location-list
       |     +--rw test-point-locations* [tunnel-location]
       |        +--rw tunnel-location    uint32
       |        +--rw vrf?               routing-instance-ref
       |        +--rw (technology)?
       |        |  +--:(technology-null)
       |        |  |  +--rw tech-null?         empty
       |        |  +--:(technology-string)
       |        |     +--rw ipv4-icmp?         string
       |        +--rw tp-tools
       |        |  +--rw connectivity-verification?   boolean
       |        |  +--rw continuity-check?            boolean
       |        |  +--rw path-discovery?              boolean
       |        +--rw root?
       |        +--rw oam-layers* [index]
       |           +--rw index                        uint16
       |           +--rw level?                       int32
       |           +--rw (tp-location)?
       |              +--:(mac-address)
       |              |  +--rw mac-address-location?  yang:mac-address
       |              +--:(ipv4-address)
       |              |  +--rw ipv4-location?         inet:ipv4-address
       |              +--:(ipv6-location)
       |              |  +--rw ipv6-address?          inet:ipv6-address
       |              +--:(tunnel-location)
       |              |  +--rw tunnel-location?       uint32
       |              +--:(ip-prefix-location)
       |              |  +--rw ip-prefix-location     inet:ip-prefix
       |              +--:(route-dist-location)



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       |              |  +--rw route-dist-location?   uint32
       |              +--:(group-ip-address-location)
       |              |  +--rw group-ip-address-location?   IP-Multicast
                                                       -Group-Address
       |              +--:(as-number-location)
       |              |  +--rw as-number-location?        inet:as-number
       |              +--:(lsp-id-location)
       |              |  +--rw lsp-id-location?           string
       |              +--:(system-id-location)
       |                 +--rw system-id-location?        router-id
       +--:(ip-prefix-location-type)
       |  +--rw test-point-ip-prefix-location-list
       |     +--rw test-point-locations* [ip-prefix-location]
       |        +--rw ip-prefix-location    inet:ip-prefix
       |        +--rw vrf?                  routing-instance-ref
       |        +--rw (technology)?
       |        |  +--:(technology-null)
       |        |  |  +--rw tech-null?            empty
       |        |  +--:(technology-string)
       |        |     +--rw ipv4-icmp?            string
       |        +--rw tp-tools
       |        |  +--rw connectivity-verification?   boolean
       |        |  +--rw continuity-check?            boolean
       |        |  +--rw path-discovery?              boolean
       |        +--rw root?
       |        +--rw oam-layers* [index]
       |           +--rw index                        uint16
       |           +--rw level?                       int32
       |           +--rw (tp-location)?
       |              +--:(mac-address)
       |              |  +--rw mac-address-location?  yang:mac-address
       |              +--:(ipv4-address)
       |              |  +--rw ipv4-location          inet:ipv4-address
       |              +--:(ipv6-location)
       |              |  +--rw ipv6-address?          inet:ipv6-address
       |              +--:(tunnel-location)
       |              |  +--rw tunnel-location?       uint32
       |              +--:(ip-prefix-location)
       |              |  +--rw ip-prefix-location?    inet:ip-prefix
       |              +--:(route-dist-location)
       |              |  +--rw route-dist-location?         uint32
       |              +--:(group-ip-address-location)
       |              |  +--rw group-ip-address-location?   IP-Multicast
                                                       -Group-Address
       |              +--:(as-number-location)
       |              |  +--rw as-number-location?        inet:as-number
       |              +--:(lsp-id-location)
       |              |  +--rw lsp-id-location?           string



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       |              +--:(system-id-location)
       |                 +--rw system-id-location?        router-id
       +--:(route-distinguisher-location-type)
       |  +--rw test-point-route-dist-location-list
       |     +--rw test-point-locations* [route-dist-location]
       |        +--rw route-dist-location    uint32
       |        +--rw vrf?                   routing-instance-ref
       |        +--rw (technology)?
       |        |  +--:(technology-null)
       |        |  |  +--rw tech-null?             empty
       |        |  +--:(technology-string)
       |        |     +--rw ipv4-icmp?             string
       |        +--rw tp-tools
       |        |  +--rw connectivity-verification?   boolean
       |        |  +--rw continuity-check?            boolean
       |        |  +--rw path-discovery?              boolean
       |        +--rw root?
       |        +--rw oam-layers* [index]
       |           +--rw index                        uint16
       |           +--rw level?                       int32
       |           +--rw (tp-location)?
       |              +--:(mac-address)
       |              |  +--rw mac-address-location?  yang:mac-address
       |              +--:(ipv4-address)
       |              |  +--rw ipv4-location          inet:ipv4-address
       |              +--:(ipv6-location)
       |              |  +--rw ipv6-address           inet:ipv6-address
       |              +--:(tunnel-location)
       |              |  +--rw tunnel-location?       uint32
       |              +--:(ip-prefix-location)
       |              |  +--rw ip-prefix-location?    inet:ip-prefix
       |              +--:(route-dist-location)
       |              |  +--rw route-dist-location?   uint32
       |              +--:(group-ip-address-location)
       |              |  +--rw group-ip-address-location?   IP-Multicast
                                                       -Group-Address
       |              +--:(as-number-location)
       |              |  +--rw as-number-location?        inet:as-number
       |              +--:(lsp-id-location)
       |              |  +--rw lsp-id-location?           string
       |              +--:(system-id-location)
       |                 +--rw system-id-location?        router-id
       +--:(group-ip-address-location-type)
       |  +--rw test-point-group-ip-address-location-list
       |     +--rw test-point-locations* [group-ip-address-location]
       |        +--rw group-ip-address-location    IP-Multicast
                                                       -Group-Address
       |        +--rw vrf?                         routing-instance-ref



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       |        +--rw (technology)?
       |        |  +--:(technology-null)
       |        |  |  +--rw tech-null?                   empty
       |        |  +--:(technology-string)
       |        |     +--rw ipv4-icmp?                   string
       |        +--rw tp-tools
       |        |  +--rw connectivity-verification?   boolean
       |        |  +--rw continuity-check?            boolean
       |        |  +--rw path-discovery?              boolean
       |        +--rw root?
       |        +--rw oam-layers* [index]
       |           +--rw index                        uint16
       |           +--rw level?                       int32
       |           +--rw (tp-location)?
       |              +--:(mac-address)
       |              |  +--rw mac-address-location?  yang:mac-address
       |              +--:(ipv4-address)
       |              |  +--rw ipv4-location?         inet:ipv4-address
       |              +--:(ipv6-location)
       |              |  +--rw ipv6-address?          inet:ipv6-address
       |              +--:(tunnel-location)
       |              |  +--rw tunnel-location?       uint32
       |              +--:(ip-prefix-location)
       |              |  +--rw ip-prefix-location?    inet:ip-prefix
       |              +--:(route-dist-location)
       |              |  +--rw route-dist-location?   uint32
       |              +--:(group-ip-address-location)
       |              |  +--rw group-ip-address-location?   IP-Multicast
                                                       -Group-Address
       |              +--:(as-number-location)
       |              |  +--rw as-number-location?        inet:as-number
       |              +--:(lsp-id-location)
       |              |  +--rw lsp-id-location?             string
       |              +--:(system-id-location)
       |                 +--rw system-id-location?          router-id
       +--:(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 vrf?                  routing-instance-ref
       |        +--rw (technology)?
       |        |  +--:(technology-null)
       |        |  |  +--rw tech-null?            empty
       |        |  +--:(technology-string)
       |        |     +--rw ipv4-icmp?            string
       |        +--rw tp-tools
       |        |  +--rw connectivity-verification?   boolean
       |        |  +--rw continuity-check?            boolean



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       |        |  +--rw path-discovery?              boolean
       |        +--rw root?
       |        +--rw oam-layers* [index]
       |           +--rw index                        uint16
       |           +--rw level?                       int32
       |           +--rw (tp-location)?
       |              +--:(mac-address)
       |              |  +--rw mac-address-location?  yang:mac-address
       |              +--:(ipv4-address)
       |              |  +--rw ipv4-location?         inet:ipv4-address
       |              +--:(ipv6-location)
       |              |  +--rw ipv6-address?          inet:ipv6-address
       |              +--:(tunnel-location)
       |              |  +--rw tunnel-location        uint32
       |              +--:(ip-prefix-location)
       |              |  +--rw ip-prefix-location?    inet:ip-prefix
       |              +--:(route-dist-location)
       |              |  +--rw route-dist-location?         uint32
       |              +--:(group-ip-address-location)
       |              |  +--rw group-ip-address-location?   IP-Multicast
                                                       -Group-Address
       |              +--:(as-number-location)
       |              |  +--rw as-number-location?        inet:as-number
       |              +--:(lsp-id-location)
       |              |  +--rw lsp-id-location?           string
       |              +--:(system-id-location)
       |                 +--rw system-id-location?        router-id
       +--:(group-lsp-id-location-type)
       |  +--rw test-point-lsp-id-location-list
       |     +--rw test-point-locations* [lsp-id-location]
       |        +--rw lsp-id-location    string
       |        +--rw vrf?               routing-instance-ref
       |        +--rw (technology)?
       |        |  +--:(technology-null)
       |        |  |  +--rw tech-null?         empty
       |        |  +--:(technology-string)
       |        |     +--rw ipv4-icmp?         string
       |        +--rw tp-tools
       |        |  +--rw connectivity-verification?   boolean
       |        |  +--rw continuity-check?            boolean
       |        |  +--rw path-discovery?              boolean
       |        +--rw root?
       |        +--rw oam-layers* [index]
       |           +--rw index                        uint16
       |           +--rw level?                       int32
       |           +--rw (tp-location)?
       |              +--:(mac-address)
       |              |  +--rw mac-address-location?  yang:mac-address



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       |              +--:(ipv4-address)
       |              |  +--rw ipv4-location          inet:ipv4-address
       |              +--:(ipv6-location)
       |              |  +--rw ipv6-address?          inet:ipv6-address
       |              +--:(tunnel-location)
       |              |  +--rw tunnel-location?       uint32
       |              +--:(ip-prefix-location)
       |              |  +--rw ip-prefix-location?    inet:ip-prefix
       |              +--:(route-dist-location)
       |              |  +--rw route-dist-location?         uint32
       |              +--:(group-ip-address-location)
       |              |  +--rw group-ip-address-location?   IP-Multicast
                                                       -Group-Address
       |              +--:(as-number-location)
       |              |  +--rw as-number-location?        inet:as-number
       |              +--:(lsp-id-location)
       |              |  +--rw lsp-id-location?            string
       |              +--:(system-id-location)
       |                 +--rw system-id-location?         router-id
       +--:(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 vrf?                  routing-instance-ref
                +--rw (technology)?
                |  +--:(technology-null)
                |  |  +--rw tech-null?            empty
                |  +--:(technology-string)
                |     +--rw ipv4-icmp?            string
                +--rw tp-tools
                |  +--rw connectivity-verification?   boolean
                |  +--rw continuity-check?            boolean
                |  +--rw path-discovery?              boolean
                +--rw root?
                +--rw oam-layers* [index]
                   +--rw index                        uint16
                   +--rw level?                       int32
                   +--rw (tp-location)?
                      +--:(mac-address)
                      |  +--rw mac-address-location?  yang:mac-address
                      +--:(ipv4-address)
                      |  +--rw ipv4-location?         inet:ipv4-address
                      +--:(ipv6-location)
                      |  +--rw ipv6-address?          inet:ipv6-address
                      +--:(tunnel-location)
                      |  +--rw tunnel-location?       uint32
                      +--:(ip-prefix-location)
                      |  +--rw ip-prefix-location     inet:ip-prefix



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                      +--:(route-dist-location)
                      |  +--rw route-dist-location?         uint32
                      +--:(group-ip-address-location)
                      |  +--rw group-ip-address-location?   IP-Multicast
                                                       -Group-Address
                      +--:(as-number-location)
                      |  +--rw as-number-location?        inet:as-number
                      +--:(lsp-id-location)
                      |  +--rw lsp-id-location?           string
                      +--:(system-id-location)
                         +--rw system-id-location?        router-id

                           data hierarchy of OAM

4.  OAM YANG Module

   <CODE BEGINS> file "ietf-connectionless-oam.yang"

module ietf-connectionless-oam {
    yang-version 1.1;
        namespace "urn:ietf:params:xml:ns:yang:ietf-connectionless-oam";

    prefix coam;

    import ietf-yang-schema-mount {
     prefix yangmnt;
    }

    import ietf-network{
      prefix nd;
    }
    import ietf-yang-types {
      prefix yang;
    }
    import ietf-interfaces {
      prefix if;
    }
    import ietf-inet-types {
      prefix inet;
    }
    import ietf-network-instance {
      prefix "ni";
    }

    organization "IETF LIME Working Group";
    contact

        "Deepak Kumar dekumar@cisco.com



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         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 indpendent manner.
       Functional level abstraction is indendent with
       YANG modeling. 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 2017-02-08 {
      description
        "Initial revision. - 10 version";
      reference "";
    }
    /* features */
    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 model for
         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 model for
         path discovery command.";
    }

    /* Identities */
    /* typedefs */

         typedef router-id {



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       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.";
      }

       typedef IPv4-Multicast-Group-Address {
            type string {
             pattern '(2((2[4-9])|(3[0-9]))\.)'
             +'(([0-9]|[1-9][0-9]|1[0-9][0-9]|'
             +'2[0-4][0-9]|25[0-5])\.){2}'
             +'([0-9]|[1-9][0-9]|1[0-9][0-9]'
             +'|2[0-4][0-9]|25[0-5])';
            }
            description
              "The IPv4-Multicast-Group-Address type
               represents an IPv4 multicast address
               in dotted-quad notation.";
            reference "RFC4607";
      } // typedef IPv4-Multicast-Group-Address
      typedef IPv6-Multicast-Group-Address {
            type string {
            pattern
            '(((FF|ff)[0-9a-fA-F]{2}):)([0-9a-fA-F]'
             +'{0,4}:){0,5}((([0-9a-fA-F]{0,4}:)?'
             +'(:|[0-9a-fA-F]{0,4}))|(((25[0-5]|2[0-4]'
             +'[0-9]|[01]?[0-9]?[0-9])\.){3}(25[0-5]|'
             +'2[0-4][0-9]|[01]?[0-9]?[0-9])))';
            pattern
            '(([^:]+:){6}(([^:]+:[^:]+)|'
             +'(.*\..*)))|((([^:]+:)*[^:]+)'
             +'?::(([^:]+:)*[^:]+)?)';
             }
            description
             "The IPv6-Multicast-Group-Address
              type represents an IPv6 address in full,
              mixed, shortened, and shortened-mixed



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              notation.";
            reference "RFC4291 2.7.
            ietf-inet-types:ipv6-address";
      }
      typedef IP-Multicast-Group-Address {
            type union {
              type IPv4-Multicast-Group-Address;
              type IPv6-Multicast-Group-Address;
            }
            description
             "The IP-Multicast-Group-Address type
              represents an IP multicast address and
              is IP version neutral. The format of the
              textual representations implies the IP version.";
      }

    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;
      }
      description
          "Target address attribute type.";
    }

    typedef opaque-tlv-type {
      type identityref {
        base opaque-tlv-type-id;
      }
      description
          "Opaque TLV type definition.";
    }

    identity time-resolution{
      description
        "Time interval resolution";
    }

    identity hours {
      base time-resolution;
      description



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        "Hours";
    }

    identity minutes {
      base time-resolution;
      description
        "Minutes";
    }

    identity seconds {
      base time-resolution;
      description
        "Seconds";

    }

    identity milliseconds {
      base time-resolution;
      description
        "Milliseconds";
    }

    identity microseconds {

      base time-resolution;
      description
        "Microseconds";
    }

    identity nanoseconds {
      base time-resolution;
      description
        "Nanoseconds";
    }
        identity opaque-tlv-type-id {
      description
          "Base identity for opaque tlv types.";
    }
    identity default-tlv-type-id {
      base opaque-tlv-type-id;
      description
          "Default or unknown TLV type id.";
    }

    /* groupings */
    grouping cc-session-statsitics {
      description "Grouping for session statistics.";
      container cc-session-statistics {



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        description "cc session counters";
        leaf session-count {
           type uint32;
           description
                   "Number of cc sessions.";
        }
        leaf session-up-count {
           type uint32;
           description
                   "Number of sessions which are up.";
        }
        leaf session-down-count {
           type uint32;
           description
                   "Number of sessions which are down.";
        }
        leaf session-admin-down-count {
           type uint32;
           description
                   "Number of sessions which are admin-down.";
        }
      }
    }

    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;
          description
                  "Total number of received OAM packet count.";
        }
        leaf tx-packet-count {
          type uint32;
          description
                  "Total number of transmitted OAM packet count.";
        }
        leaf rx-bad-packet {
          type uint32;
          description
                  "Total number of received bad OAM packet.";
        }
        leaf tx-packet-failed {
          type uint32;
          description
                  "Total number of send OAM packet failed.";



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        }
      }
    }

    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;
          description
                  "Total down count.";
        }
        leaf admin-down-count {
          type uint32;
          description
                  "Total down count.";
        }
        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-drops-count {
          type uint32;
          description
                  "Total received packet drops count.";
        }



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        leaf packet-reorder-count {

          type uint32;
          description
                  "Total received packet reordered count.";
        }
        leaf packets-out-of-seq-count {
          type uint32;
          description
                  "Total received out of sequence count.";
        }
        leaf packets-dup-count {
          type uint32;
          description
                  "Total received packet duplicates count.";
        }
      }
    }

    grouping session-delay-statistics {
      description
          "Grouping for per session delay statistics";
      container session-delay-statistics {
        description
                "Session delay summarised information.";
        leaf time-resolution-value {
          type identityref {
            base time-resolution;
          }
          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
                  "Average delay value observed.";
        }




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      }
    }

    grouping session-jitter-statistics {
      description
          "Grouping for per session jitter statistics";
      container session-jitter-statistics {
        description
                "Session jitter summarised information.";
        leaf time-resolution-value {
          type identityref {
            base time-resolution;
          }
          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{
        description
                "OAM per session path verification statistics.";
        leaf verified-count {
          type uint32;
          description
                  "Total number of OAM packets that
                  went through a path as intended.";
        }
        leaf failed-count {
          type uint32;



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          description
                  "Total number of OAM packets that
                  went through an unintended path.";
        }
      }
    }

    grouping session-type {
      description
        "This object indicates the current session
         definition.";
      leaf session-type-enum {
        type enumeration {
          enum proactive {
            description
            "The current session is proactive";
          }
          enum on-demand {
            description
            "The current session is on-demand.";
          }
        }
        default "on-demand";
        description
          "Session type enum";
      }
    }
        grouping opaque-info-tlv {
      description
          "Opaque information as a TLV.";
      leaf type {
       type opaque-tlv-type;
       description "TLV type.";
      }
      leaf length {
       type uint16;
       description "TLV length.";
      }
      leaf value {
       type yang:hex-string;
       description "TLV value.";
      }
    }

    grouping opaque-tlvs {
      description
          "Opaque TLVs.";
      container opaque-tlvs {



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        description
                "Opaque TLVs container.";
        list opaque-tlvs-list {
          description
                  "Opaque TLVs list.";
          uses opaque-info-tlv;
        }
      }
    }
    identity tp-address-type {
      description
        "Test point address type";
    }

    identity mac-address-type {
      base tp-address-type;
      description
        "MAC address type";
    }

    identity ipv4-address-type {
      base tp-address-type;
      description
        "IPv4 address type";
    }

    identity ipv6-address-type {
      base tp-address-type;
      description
        "IPv6 address type";
    }

    identity tp-attribute-type {

      base tp-address-type;
      description
        "Test point attribute type";
    }

    identity system-id-address-type {
      base tp-address-type;
      description
        "System id address type";
    }

    identity lsp-id-address-type {
      base tp-address-type;
      description



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        "LSP ID address type";
    }

    identity as-number-address-type {
      base tp-address-type;
      description
        "AS number address type";
    }

    identity group-ip-address-type {
      base tp-address-type;
      description
        "Group IP address type";
    }

    identity route-distinguisher-address-type {
      base tp-address-type;
      description
        "Route Distinguisher address type";
    }

    identity ip-prefix-address-type {
      base tp-address-type;
      description
        "IP prefix address type";
    }

    identity tunnel-address-type {
      base tp-address-type;
      description
        "Tunnel address type";
    }

    grouping tp-address {
      leaf tp-location-type-value {
        type identityref {
          base tp-address-type;
        }
        description "Test point address type.";
      }

      choice tp-address {

        case mac-address {
          when "'tp-location-type-value' = 'mac-address-type'" {
            description "MAC address type";
          }
          leaf mac-address {



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            type yang:mac-address;
            description
            "MAC Address";
          }
          description
          "MAC Address based MP Addressing.";
        }
        case ipv4-address {
          when "'tp-location-type-value' = 'ipv4-address-type'" {
            description "IPv4 address type";
          }
          leaf ipv4-address {
            type inet:ipv4-address;
            description
            "IPv4 Address";
          }
          description
          "IP Address based MP Addressing.";
        }
        case ipv6-address {
          when "'tp-location-type-value' = 'ipv6-address-type'" {
            description "IPv6 address type";
          }
          leaf ipv6-address {
            type inet:ipv6-address;
            description
            "IPv6 Address";

          }
          description
          "ipv6 Address based MP Addressing.";
        }

        case tp-attribute {
          when "'tp-location-type-value' = 'tp-attribute-type'" {
            description "Test point attribute type";
          }
          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;



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                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.";
              }
            }
            case vpls {
              leaf route-distinguisher {
               type uint32;
               description
               "Route Distinguisher(8 octets).";
              }
              leaf sender-ve-id{
               type uint32;
               description
                           "Sender's VE ID.";
              }
              leaf receiver-ve-id{
               type uint32;
               description
               "Receiver's VE ID.";
              }
            }



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            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 IP-Multicast-Group-Address;
                description
                                "Group ip address.";
               }
              }
              case vpn{
               leaf as-number{
                type inet:as-number;
                description
                                "AS number.";
               }
              }
              case global-id{
               leaf lsp-id{
                type string;
                description
                "LSP id.";
               }
              }
             }
            }
          }
        }

        case system-info {
          when "'tp-location-type-value' = 'system-id-address-type'" {
           description "System id address type";
          }
          leaf system-id {
            type router-id;
            description
            "System ID assigned to this node.";
          }

        }
        description
        "TP Addressing.";



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      }
      description
      "TP Address";
    }

    grouping tp-address-vrf {
      description
        "Test point address with VRF.";
      leaf vrf {
        type routing-instance-ref;
         description
         "The vrf is used to describe the
          corresponding network instance";
      }

      uses tp-address;
    }

    grouping connectionless-oam-layers {
      list oam-layers {
         key "index";
         leaf index {
          type uint16 {
            range "0..65535";
          }
                  description
          "Index";
         }
        leaf level {
         type int32 {
         range "-1..1";
         }
         default 0;
         description
                 "Level 0 indicates default level,
                 -1 means server and +1 means client layer.
          In relationship 0 means 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.";



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        }
        case ipv4-address {
          leaf ipv4-location {
           type inet:ipv4-address;
           description
           "Ipv4 Address";
          }
          description
          "IP Address based MP Addressing.";
        }
        case ipv6-location {
          leaf ipv6-address {
           type inet:ipv6-address;
           description
           "IPv6 Address";
          }
          description
          "IPv6 Address based MP Addressing.";
        }

        case tunnel-location{
         leaf tunnel-location{
                  type uint32;
                  description
                  "VPN Prefix";
                 }
                 description
                 "Tunnel location";
                 }

                 case ip-prefix-location{
                  leaf ip-prefix-location{
                   type inet:ip-prefix;
                   description
                   "IP prefix location";
                  }
                  description
                  "IP prefix location";
                 }

                 case route-dist-location{
                  leaf route-dist-location{
                   type uint32;
                   description
                   "Route Distinguisher (8 octets)";
                  }
                  description
                  "Route distinguisher location";



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                 }

                 case group-ip-address-location{
                  leaf group-ip-address-location{
                   type IP-Multicast-Group-Address;
                   description
                   "Group IP address location";
                  }
                  description
                  "Group IP address";
                 }

                 case as-number-location{
                  leaf as-number-location{
                   type inet:as-number;
                   description
                   "AS number location";
                  }
                  description
                  "AS number";
                 }

                 case lsp-id-location{
                  leaf lsp-id-location{
                   type string;
                   description
                   "LSP id";
                  }
                  description
                  "LSP ID";
                 }

                 case system-id-location{
                  leaf system-id-location{
                   type router-id;
                   description
                   "System id location";
                  }
                  description
                  "System ID";
                 }

        description
          "TP location.";

          }
        ordered-by user;
         description



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         "List of related oam layers.
                 0 means they are in same level, especially
                 interworking scenarios of stiching multiple
                 technology at same layer. -1 means server layer,
                 for eg:- in case of Overlay and Underlay,
                 Underlay is server layer for Overlay Test Point.
                 +1 means client layer, for eg:- in case of
                 Service OAM and Transport OAM, Service OAM is client
                 layer to Transport OAM.";
      }
      description
        "Connectionless related OAM layer";
    }

    grouping tp-technology {
       choice technology {
          default technology-null;
          case technology-null {
            description
            "This is a placeholder when no technology is needed.";
            leaf tech-null {
             type empty;
             description
             "There is no technology define";
            }
          }
          description
          "Technology choice null";
          case technology-string {
            description
            "OAM technology string";
            leaf ipv4-icmp {
              type string;
              description
              "Name to identify oam technology";
            }
         }
       }

       description
        "OAM Technology";
    }

    grouping tp-tools {
      description
        "Test Point OAM Toolset.";
      container tp-tools{
           leaf connectivity-verification{



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            type boolean;
                description
                "A flag indicating whether or not the
                connectivity-verification 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 5085: Pseudowire Virtual Circuit Connectivity Verification.
                  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 4379: LSP-PING.";
           }
           leaf continuity-check{
            type boolean;
                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.";
           }
           leaf path-discovery{
            type boolean;
                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)
          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 4379: LSP-PING.";
           }
           description
           "Container for test point OAM tools set.";



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          }

    }

    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-layers;
      description
        "Test point Location";
    }

    grouping test-point-locations {
      description "Group of test point locations.";
      leaf tp-location-type-value {
        type identityref {
          base tp-address-type;
        }
        description "Test point location type.";

      }
      choice location-type {
        case ipv4-location-type {
          when "'tp-location-type-value' = '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";
              leaf ipv4-location {
                type inet:ipv4-address;
                description
                  "IPv4 Address.";
              }
              leaf vrf {
                type routing-instance-ref;
                description
                "The vrf is used to describe the
                 corresponding network instance";
              }




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              uses test-point-location-info;

              ordered-by user;
              description
                "List of test point locations.";
            }
            description
            "Serves as top-level container
                        for test point location list.";
          }
        }
        case ipv6-location-type {
          when "'tp-location-type-value' = '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";
              leaf ipv6-location {
                type inet:ipv6-address;
                description
                  "IPv6 Address.";
              }
              leaf vrf {
                type routing-instance-ref;
                description
                                "The vrf is used to describe the
                corresponding network instance";
              }
              uses test-point-location-info;
              ordered-by user;
              description
                "List of test point locations.";
            }
            description
              "Serves as top-level container
                          for test point location list.";
          }
        }
        case mac-location-type {
          when "'tp-location-type-value' = '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";



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            leaf mac-address-location {
              type yang:mac-address;
              description
                "MAC Address";
            }
            uses test-point-location-info;
            ordered-by user;
            description
             "List of test point locations.";
            }
            description
            "Serves as top-level container
                        for test point location list.";
          }
        }
        case tunnel-location-type {
         when "'tp-location-type-value' ="
                 +" 'tunnel-address-type'" {
         description
         "When test point location type
                 is equal to tunnel type.";
         }
          container test-point-tunnel-location-list {
            list test-point-locations {
            key "tunnel-location";
            leaf tunnel-location {
              type uint32;
              description
                "VPN Prefix";

            }
            leaf vrf {
             type routing-instance-ref;
             description
             "The vrf is used to describe the
              corresponding network instance";
            }
            uses test-point-location-info;
            ordered-by user;
            description
             "List of test point locations.";
            }
            description
            "Serves as top-level container
                        for test point location list.";
          }
        }
        case ip-prefix-location-type {



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             when "'tp-location-type-value' = "
                 +"'ip-prefix-address-type'" {
          description
          "When test point location
                  type is equal to ip prefix.";
          }
          container test-point-ip-prefix-location-list {
            list test-point-locations {
            key "ip-prefix-location";
            leaf ip-prefix-location {
              type inet:ip-prefix;
              description
              "IP Prefix";
            }
            leaf vrf {
              type routing-instance-ref;
              description
              "The vrf is used to describe the
               corresponding network instance";
            }
            uses test-point-location-info;
            ordered-by user;
            description
             "List of test point locations.";
            }
            description
             "Serves as top-level container
                         for test point location list.";
          }
        }
        case route-distinguisher-location-type {
          when "'tp-location-type-value' = "
                  +"'route-distinguisher-address-type'" {
            description
                        "When test point
                        location type is equal to
            route distinguiher.";
          }

          container test-point-route-dist-location-list {
            list test-point-locations {
            key "route-dist-location";
            leaf route-dist-location {
              type uint32;
              description
              "Route Distinguisher(8 octets).";
            }
            leaf vrf {



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              type routing-instance-ref;
              description
              "The vrf is used to describe the
               corresponding network instance";
            }
            uses test-point-location-info;
            ordered-by user;
            description
             "List of test point locations.";
            }
            description
             "Serves as top-level container
                         for test point location list.";
          }
        }
        case group-ip-address-location-type {
          when "'tp-location-type-value' = "
                  +"'group-ip-address-type'" {
            description
                        "When test point location type is equal to
             group ip address.";
          }
          container test-point-group-ip-address-location-list {
            list test-point-locations {
            key "group-ip-address-location";
            leaf group-ip-address-location {
              type IP-Multicast-Group-Address;
              description
              "Group IP address.";
            }
            leaf vrf {
              type routing-instance-ref;
              description
              "The vrf is used to describe the
               corresponding network instance";
            }
            uses test-point-location-info;
            ordered-by user;
            description
             "List of test point locations.";
            }

            description
              "Serves as top-level container for
                          test point location list.";
          }
        }
        case group-as-number-location-type {



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          when "'tp-location-type-value' = "
                  +"'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.";
            }
            leaf vrf {
              type routing-instance-ref;
              description
              "The vrf is used to describe the
               corresponding network instance";
            }
            uses test-point-location-info;
            ordered-by user;
            description
             "List of test point locations.";
            }
            description
             "Serves as top-level container
                         for test point location list.";
          }
        }
        case group-lsp-id-location-type {
          when "'tp-location-type-value' = "
                  +"'lsp-id-address-type'" {
            description
                        "When test point location
                        type is equal to lspid.";
          }
          container test-point-lsp-id-location-list {
            list test-point-locations {
            key "lsp-id-location";
            leaf lsp-id-location {
              type string;
              description
              "LSP Id.";
            }
            leaf vrf {
              type routing-instance-ref;
               description



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               "The vrf is used to describe the
                corresponding network instance";
            }
            uses test-point-location-info;
            ordered-by user;
            description
             "List of test point locations.";
            }
            description
             "Serves as top-level container for
                         test point location list.";
          }
        }
        case group-system-id-location-type {
          when "'tp-location-type-value' = "
                  +"'system-id-address-type'" {
            description
                        "When test point location 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 vrf {
              type routing-instance-ref;
              description
              "The vrf is used to describe the
              corresponding network instance";
            }
            uses test-point-location-info;
            ordered-by user;
            description
            "List of test point locations.";
            }
            description
            "Serves as top-level container for
                     test point location list.";
          }
        }
        description
          "Choice of address types.";
      }
    }



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    augment "/nd:networks/nd:network/nd:node"{
      description
      "Augment test points of connectionless oam.";
      uses test-point-locations;

    }

    grouping path-discovery-data {
      description
          "Path discovery related data output from nodes.";
      container src-test-point {
        description "Source test point.";
        uses tp-address-vrf;
      }
      container dest-test-point {
        description "Destination test point.";
        uses tp-address-vrf;
      }
      leaf sequence-number {
        type uint64;
        description "Sequence number in data packets.";
      }
      leaf hop-cnt {
        type uint8;
        description "Hop count.";
      }

      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 list has typically a single element for per-hop
         cases like path-discovery RPC but allows a list of



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         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-vrf;

          leaf timestamp-sec {
            type uint64;
            description
                        "Absolute timestamp in
                        seconds as per IEEE1588v2.";
          }
          leaf timestamp-nanosec {
            type uint32;
            description
                        "Fractional part in
                        nanoseconds as per IEEE1588v2.";
          }

          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 egress interface
                        queue of the interface.";
          }
          leaf transit-delay {
            type uint32;
            description
            "Time in nano seconds
                        packet spent transiting a node.";



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          }

          leaf app-meta-data {
            type uint64;
            description
             "Application specific
                         data added by node.";
          }
                  uses opaque-tlvs;
        }
      }
    }

    grouping continuity-check-data {
      description
          "Continuity check data output from nodes.";
      container src-test-point {
        description "Source test point.";
        uses tp-address-vrf;

        leaf egress-intf-name {
          type if:interface-ref;
          description
            "Egress interface name";
        }
      }
      container dest-test-point {
        description
                "Destination test point.";
        uses tp-address-vrf;

        leaf ingress-intf-name {
          type if:interface-ref;
          description
            "Ingress interface name";

        }
      }
      leaf sequence-number {
        type uint64;
        description "Sequence number.";
      }
      leaf hop-cnt {
        type uint8;
        description "Hop count.";
      }

      uses session-packet-statistics;



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      uses session-error-statistics;
      uses session-delay-statistics;
      uses session-jitter-statistics;
    }

    container cc-oper-data {
      if-feature continuity-check;
      config "false";
      description "CC operational information.";
      container cc-ipv4-sessions-statistics {
        description "CC ipv4 sessions";
        uses cc-session-statsitics;
      }
      container cc-ipv6-sessions-statistics {
        description "CC ipv6 sessions";
        uses cc-session-statsitics;
      }
    }
}

   <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.




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   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":

   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"
   +"/coam:technology-string"
   {
       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-location"
   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 anohter alternative method is using schema mount mechanism
   [I-D.ietf-netmod-schema-mount] in the "ietf-connectionless-oam".
   Within the "test-point-location" list, a "root" attribute is defined
   to provide a mounted point for models mounted per "test-point-
   location".  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> 1.1.1.1</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

   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.draft-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.  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"
   +"/coam:technology-string"
   {
      leaf lsp-ping{
      type string;
     }
   }

5.2.2.  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-location" list.

   User can reuse the attributes or groupings which are defined in
   [I-D.draft-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.";
           ......
         }

6.  Security Considerations

   The YANG module defined in this memo is designed to be accessed via
   the NETCONF protocol [RFC6241].  The lowest NETCONF layer is the
   secure transport layer and the mandatory-to-implement secure
   transport is SSH [RFC6242].  The NETCONF access control model
   [RFC6536] provides the means to restrict access for particular
   NETCONF users to a pre-configured subset of all available NETCONF
   protocol operations and content.



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   There are a number of data nodes defined in the YANG module which 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/coam:location-type/coam:ipv4-
   location-type/coam:test-point-ipv4-location-list/coam:test-point-
   locations/

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

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

   /nd:networks/nd:network/nd:node/coam:location-type/coam:tunnel-
   location-type/coam:test-point-tunnel-address-location-list/coam:test-
   point-locations/

   /nd:networks/nd:network/nd:node/coam:location-type/coam:ip-prefix-
   location-type/coam:test-point-ip-prefix-location-list/coam:test-
   point-locations/

   /nd:networks/nd:network/nd:node/coam:location-type/coam:route-
   distinguisher-location-type/coam:test-point-route-dist-location-list/
   coam:test-point-locations/

   /nd:networks/nd:network/nd:node/coam:location-type/coam:group-ip-
   address-location-type/coam:test-point-group-ip-address-location-list/
   coam:test-point-locations/

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

   /nd:networks/nd:network/nd:node/coam:location-type/coam:group-lsp-id-
   location-type/coam:test-point-lsp-id-location-list/coam:test-point-
   locations/






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   /nd:networks/nd:network/nd:node/coam:location-type/coam:group-system-
   id-location-type/coam:test-point-system-info-location-list/coam: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.

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: coam

   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

   [I-D.draft-zheng-mpls-lsp-ping-yang-cfg]
              Zheng, L., Aldrin, S., Zheng, G., Mirsky, G., and R.
              Rahman, "Yang Data Model for LSP-PING", I-D draft-zheng-
              mpls-lsp-ping-yang-cfg, March 2016.




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   [I-D.ietf-bfd-yang]
              Zheng, L., Rahman, R., Networks, J., Jethanandani, M., and
              G. Mirsky, "Yang Data Model for Bidirectional Forwarding
              Detection (BFD)", draft-ietf-bfd-yang-04 (work in
              progress), January 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-11 (work in
              progress), February 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-00 (work in progress), October 2016.

   [I-D.ietf-lime-yang-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-oam-
              model-08 (work in progress), December 2016.

   [I-D.ietf-netmod-schema-mount]
              Bjorklund, M. and L. Lhotka, "YANG Schema Mount", draft-
              ietf-netmod-schema-mount-03 (work in progress), October
              2016.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <http://www.rfc-editor.org/info/rfc2119>.

   [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
              DOI 10.17487/RFC3688, January 2004,
              <http://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", RFC 4443,
              DOI 10.17487/RFC4443, March 2006,
              <http://www.rfc-editor.org/info/rfc4443>.







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   [RFC6020]  Bjorklund, M., Ed., "YANG - A Data Modeling Language for
              the Network Configuration Protocol (NETCONF)", RFC 6020,
              DOI 10.17487/RFC6020, October 2010,
              <http://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,
              <http://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,
              <http://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,
              <http://www.rfc-editor.org/info/rfc6536>.

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

9.2.  Informative References

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

   [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-05 (work in progress), October 2016.

   [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,
              <http://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,
              <http://www.rfc-editor.org/info/rfc7276>.








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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


   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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