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rfc:rfc8531

Internet Engineering Task Force (IETF) D. Kumar Request for Comments: 8531 Cisco Category: Standards Track Q. Wu ISSN: 2070-1721 M. Wang

                                                                Huawei
                                                            April 2019
                    Generic YANG Data Model for

Connection-Oriented Operations, Administration, and Maintenance (OAM)

                             Protocols

Abstract

 This document presents a base YANG data model for connection-oriented
 Operations, Administration, and Maintenance (OAM) protocols.  It
 provides a technology-independent abstraction of key OAM constructs
 for such protocols.  The model presented here can be extended to
 include technology-specific details.  This guarantees uniformity in
 the management of OAM protocols and provides support for nested OAM
 workflows (i.e., performing OAM functions at different levels through
 a unified interface).
 The YANG data model in this document conforms to the Network
 Management Datastore Architecture.

Status of This Memo

 This is an Internet Standards Track document.
 This document is a product of the Internet Engineering Task Force
 (IETF).  It represents the consensus of the IETF community.  It has
 received public review and has been approved for publication by the
 Internet Engineering Steering Group (IESG).  Further information on
 Internet Standards is available in Section 2 of RFC 7841.
 Information about the current status of this document, any errata,
 and how to provide feedback on it may be obtained at
 https://www.rfc-editor.org/info/rfc8531.

Kumar, et al. Standards Track [Page 1] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

Copyright Notice

 Copyright (c) 2019 IETF Trust and the persons identified as the
 document authors.  All rights reserved.
 This document is subject to BCP 78 and the IETF Trust's Legal
 Provisions Relating to IETF Documents
 (https://trustee.ietf.org/license-info) in effect on the date of
 publication of this document.  Please review these documents
 carefully, as they describe your rights and restrictions with respect
 to this document.  Code Components extracted from this document must
 include Simplified BSD License text as described in Section 4.e of
 the Trust Legal Provisions and are provided without warranty as
 described in the Simplified BSD License.

Kumar, et al. Standards Track [Page 2] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

Table of Contents

 1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
 2.  Conventions Used in This Document . . . . . . . . . . . . . .   5
   2.1.  Abbreviations . . . . . . . . . . . . . . . . . . . . . .   6
   2.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   7
   2.3.  Tree Diagrams . . . . . . . . . . . . . . . . . . . . . .   7
 3.  Architecture of Generic YANG Data Model for Connection-
     Oriented OAM  . . . . . . . . . . . . . . . . . . . . . . . .   7
 4.  Overview of the Connection-Oriented OAM YANG Data Model . . .   8
   4.1.  Maintenance Domain (MD) Configuration . . . . . . . . . .   9
   4.2.  Maintenance Association (MA) Configuration  . . . . . . .  10
   4.3.  Maintenance End Point (MEP) Configuration . . . . . . . .  11
   4.4.  RPC Definitions . . . . . . . . . . . . . . . . . . . . .  11
   4.5.  Notifications . . . . . . . . . . . . . . . . . . . . . .  14
   4.6.  Monitor Statistics  . . . . . . . . . . . . . . . . . . .  14
   4.7.  OAM Data Hierarchy  . . . . . . . . . . . . . . . . . . .  14
 5.  OAM YANG Module . . . . . . . . . . . . . . . . . . . . . . .  19
 6.  Base Mode . . . . . . . . . . . . . . . . . . . . . . . . . .  42
   6.1.  MEP Address . . . . . . . . . . . . . . . . . . . . . . .  42
   6.2.  MEP ID for Base Mode  . . . . . . . . . . . . . . . . . .  42
   6.3.  Maintenance Association . . . . . . . . . . . . . . . . .  42
 7.  Connection-Oriented OAM YANG Data Model Applicability . . . .  43
   7.1.  Generic YANG Data Model Extension for TRILL OAM . . . . .  43
     7.1.1.  MD Configuration Extension  . . . . . . . . . . . . .  43
     7.1.2.  MA Configuration Extension  . . . . . . . . . . . . .  44
     7.1.3.  MEP Configuration Extension . . . . . . . . . . . . .  45
     7.1.4.  RPC Extension . . . . . . . . . . . . . . . . . . . .  46
   7.2.  Generic YANG Data Model Extension for MPLS-TP OAM . . . .  46
     7.2.1.  MD Configuration Extension  . . . . . . . . . . . . .  47
     7.2.2.  MA Configuration Extension  . . . . . . . . . . . . .  48
     7.2.3.  MEP Configuration Extension . . . . . . . . . . . . .  48
 8.  Security Considerations . . . . . . . . . . . . . . . . . . .  49
 9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  50
 10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  50
   10.1.  Normative References . . . . . . . . . . . . . . . . . .  50
   10.2.  Informative References . . . . . . . . . . . . . . . . .  51
 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  53
 Contributors  . . . . . . . . . . . . . . . . . . . . . . . . . .  53
 Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  54

Kumar, et al. Standards Track [Page 3] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

1. Introduction

 Operations, Administration, and Maintenance (OAM) are important
 networking functions that allow operators to:
 1.  monitor network communications (i.e., reachability verification
     and Continuity Check)
 2.  troubleshoot failures (i.e., fault verification and localization)
 3.  monitor service-level agreements and performance (i.e.,
     performance management)
 An overview of OAM tools is presented in [RFC7276].  Over the years,
 many technologies have developed similar tools for fault and
 performance management.
 The different sets of OAM tools may support both connection-oriented
 technologies or connectionless technologies.  In connection-oriented
 technologies, a connection is established prior to the transmission
 of data.  After the connection is established, no additional control
 information such as signaling or operations and maintenance
 information is required to transmit the actual user data.  In
 connectionless technologies, data is typically sent between
 communicating endpoints without prior arrangement, but control
 information is required to identify the destination (e.g., [G.800]).
 The YANG data model for OAM protocols using connectionless
 communications is specified in [RFC8532] and [IEEE802.1Q].
 Connectivity Fault Management as specified in [IEEE802.1Q] is a well-
 established OAM standard that is widely adopted for Ethernet
 networks.  ITU-T [G.8013], MEF Forum (MEF) Service OAM [MEF-17], MPLS
 Transport Profile (MPLS-TP) [RFC6371], and Transparent
 Interconnection of Lots of Links (TRILL) [RFC7455] all define OAM
 mechanisms based on the manageability framework of Connectivity Fault
 Management (CFM) [IEEE802.1Q].
 Given the wide adoption of the underlying OAM concepts defined in CFM
 [IEEE802.1Q], it is a reasonable choice to develop the unified
 management framework for connection-oriented OAM based on those
 concepts.  In this document, we take the CFM [IEEE802.1Q] model and
 extend it to a technology-independent framework and define the
 corresponding YANG data model accordingly.  The YANG data model
 presented in this document is the base model for connection-oriented
 OAM protocols and supports generic continuity check, connectivity
 verification, and path discovery (traceroute).  The generic YANG data
 model for connection-oriented OAM is designed to be extensible to
 other connection-oriented technologies.  Technology-dependent nodes

Kumar, et al. Standards Track [Page 4] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

 and remote procedure call (RPC) commands are defined in technology-
 specific YANG data models, which use and extend the base model
 defined here.  As an example, Virtual eXtensible Local Area Network
 (VXLAN) uses the source UDP port number for flow entropy, while TRILL
 uses either (a) MAC addresses, (b) the VLAN tag or Fine-Grained
 Label, and/or (c) IP addresses for flow entropy in the hashing for
 multipath selection.  To capture this variation, corresponding YANG
 data models would define the applicable structures as augmentation to
 the generic base model presented here.  This accomplishes three
 goals: First, it keeps each YANG data model smaller and more
 manageable.  Second, it allows independent development of
 corresponding YANG data models.  Third, implementations can limit
 support to only the applicable set of YANG data models (e.g., TRILL
 RBridge may only need to implement the generic model and the TRILL
 YANG data model).
 The YANG data model presented in this document is generated at the
 management layer.  Encapsulations and state machines may differ
 according to each OAM protocol.  A user who wishes to issue a
 Continuity Check command or a Loopback or initiate a performance
 monitoring session can do so in the same manner, regardless of the
 underlying protocol or technology or specific vendor implementation.
 As an example, consider a scenario where connectivity from device A
 loopback to device B fails.  Between device A and B there are IEEE
 802.1 bridges a, b, and c.  Let's assume a, b, and c are using CFM
 [IEEE802.1Q].  A user, upon detecting the loopback failure, may
 decide to drill down to the lower level at different segments of the
 path and issue the corresponding fault verification (Loopback
 Message) and fault isolation (Looktrace Message) tools, using the
 same API.  This ability to drill down to a lower layer of the
 protocol stack at a specific segment within a path for fault
 localization and troubleshooting is referred to as "nested OAM
 workflow".  It is a useful concept that leads to efficient network
 troubleshooting and maintenance workflows.  The connection-oriented
 OAM YANG data model presented in this document facilitates that
 without needing changes to the underlying protocols.
 The YANG data model in this document conforms to the Network
 Management Datastore Architecture defined in [RFC8342].

2. Conventions Used in This Document

 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
 "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
 "OPTIONAL" in this document are to be interpreted as described in
 BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
 capitals, as shown here.

Kumar, et al. Standards Track [Page 5] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

 Many of the terms used in this document (including those set out in
 Sections Section 2.1 and Section 2.2) are specific to the world of
 OAM.  This document does not attempt to explain the terms but does
 assume that the reader is familiar with the concepts.  For a good
 overview, read [IEEE802.1Q].  For an example of how these OAM terms
 appear in IETF work, see [RFC6371].

2.1. Abbreviations

 CCM   - Continuity Check Message [IEEE802.1Q]
 ECMP  - Equal-Cost Multipath
 LBM   - Loopback Message [IEEE802.1Q]
 LTM   - Linktrace Message [IEEE802.1Q]
 MP    - Maintenance Point [IEEE802.1Q]
 MEP   - Maintenance End Point [RFC7174] (also known as Maintenance
       association End Point [IEEE802.1Q] and MEG End Point [RFC6371])
 MIP   - Maintenance Intermediate Point [RFC7174] (also known as
       Maintenance domain Intermediate Point [IEEE802.1Q] and MEG
       Intermediate Point [RFC6371])
 MA    - Maintenance Association [IEEE802.1Q] [RFC7174]
 MD    - Maintenance Domain [IEEE802.1Q]
 MEG   - Maintenance Entity Group [RFC6371]
 MTV   - Multi-destination Tree Verification Message
 OAM   - Operations, Administration, and Maintenance [RFC6291]
 TRILL - Transparent Interconnection of Lots of Links [RFC6325]
 CFM   - Connectivity Fault Management [RFC7174] [IEEE802.1Q]
 RPC   - Remote Procedure Call
 CC    - Continuity Check [RFC7276]
 CV    - Connectivity Verification [RFC7276]

Kumar, et al. Standards Track [Page 6] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

2.2. Terminology

 Continuity Checks  - Continuity Checks are used to verify that a
    destination is reachable and therefore also are referred to as
    "reachability verification".
 Connectivity Verification  - Connectivity Verification is used to
    verify that a destination is connected.  It is also referred to as
    "path verification" and used to verify not only that the two MPs
    are connected, but also that they are connected through the
    expected path, allowing detection of unexpected topology changes.
 Proactive OAM  - Proactive OAM refers to OAM actions that are carried
    out continuously to permit proactive reporting of fault.  A
    proactive OAM method requires persistent configuration.
 On-demand OAM  - On-demand OAM refers to OAM actions that are
    initiated via manual intervention for a limited time to carry out
    diagnostics.  An on-demand OAM method requires only transient
    configuration.

2.3. Tree Diagrams

 Tree diagrams used in this document follow the notation defined in
 [RFC8340].

3. Architecture of Generic YANG Data Model for Connection-Oriented OAM

 In this document, we define a generic YANG data model for connection-
 oriented OAM protocols.  The YANG data model defined here is generic
 in a sense that other technologies can extend it for technology-
 specific needs.  The generic YANG data model for connection-oriented
 OAM acts as the root for other OAM YANG data models.  This allows
 users to traverse between different OAM protocols with ease through a
 uniform API set.  This also enables a nested OAM workflow.  Figure 1
 depicts the relationship of different OAM YANG data models to the
 Generic YANG Data Model for connection-oriented OAM.  The Generic
 YANG data model for connection-oriented OAM provides a framework
 where technology-specific YANG data models can inherit constructs
 from the base YANG data models without needing to redefine them
 within the sub-technology.

Kumar, et al. Standards Track [Page 7] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

                          +-----------+
                          |Connection-|
                          | Oriented  |
                          |  generic  |
                          | OAM YANG  |
                          +-+-+-+-+-+-+
                               |
                               |
                               |
       +------------------------------------------+
       |                       |                  |
   +-+-+-+-+-+          +-+-+-+-+-+          +-+-+-+-+-+
   | TRILL   |          | MPLS-TP |     . . .|  foo    |
   |OAM YANG |          |OAM YANG |          |OAM YANG |
   +-+-+-+-+-+          +-+-+-+-+-+          +-+-+-+-+-+
         |                    |                  |
         |                    |              +-+-+-+-+-+
         |                    |         . . .|  foo    |
         |                    |              |sub tech |
         |                    |              +-+-+-+-+-+
         |                    |                  |
         |                    |                  |
  +-------------------------------------------------------+
  |                      Uniform API                      |
  +-------------------------------------------------------+
 Figure 1: Relationship of OAM YANG Data Model to Generic (Base) YANG
                              Data Model

4. Overview of the Connection-Oriented OAM YANG Data Model

 In this document, we adopt the concepts of the CFM [IEEE802.1Q] model
 and structure such that it can be adapted to different connection-
 oriented OAM protocols.
 At the top of the model is the Maintenance Domain.  Each Maintenance
 Domain is associated with a Maintenance Name and a Domain Level.
 Under each Maintenance Domain, there is one or more Maintenance
 Associations (MAs).  In TRILL, the MA can correspond to a Fine-
 Grained Label.
 Under each MA, there can be two or more MEPs (Maintenance End
 Points).  MEPs are addressed by their respective technology-specific
 address identifiers.  The YANG data model presented here provides
 flexibility to accommodate different addressing schemes.

Kumar, et al. Standards Track [Page 8] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

 Commands are presented in the management protocol, which is
 orthogonal to the Maintenance Domain.  These are RPC commands, in
 YANG terms.  They provide uniform APIs for Continuity Check,
 connectivity verification, path discovery (traceroute), and their
 equivalents, as well as other OAM commands.
 The OAM entities in the generic YANG data model defined here will be
 either explicitly or implicitly configured using any of the OAM
 tools.  The OAM tools used here are limited to the OAM toolset
 specified in Section 5.1 of [RFC7276].  In order to facilitate a
 zero-touch experience, this document defines a default mode of OAM.
 The default mode of OAM is referred to as the "Base Mode" and
 specifies default values for each of the model's parameters, such as
 Maintenance Domain Level, Name of the Maintenance Association,
 Addresses of MEPs, and so on.  The default values of these depend on
 the technology.  Base Mode for TRILL is defined in [RFC7455].  Base
 Mode for other technologies and future extensions developed in IETF
 will be defined in their corresponding documents.
 It is important to note that no specific enhancements are needed in
 the YANG data model to support Base Mode.  Implementations that
 comply with this document use, by default, the data nodes of the
 applicable technology.  Data nodes of the Base Mode are read-only
 nodes.

4.1. Maintenance Domain (MD) Configuration

 The container "domains" is the top-level container within the
 "gen-oam" module.  Within the container "domains", a separate list is
 maintained per MD.  The MD list uses the key "md-name-string" for
 indexing.  The "md-name-string" is a leaf and derived from type
 string.  Additional name formats as defined in [IEEE802.1Q], or other
 standards, can be included by association of the "md-name-format"
 with an identity-ref.  The "md-name-format" indicates the format of
 the augmented "md-name".  The "md-name" is presented as choice/case
 construct.  Thus, it is easily augmentable by derivative work.

Kumar, et al. Standards Track [Page 9] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

     module: ietf-connection-oriented-oam
     +--rw domains
        +--rw domain* [technology md-name-string]
           +--rw technology        identityref
           +--rw md-name-string    md-name-string
           +--rw md-name-format?   identityref
           +--rw (md-name)?
           |  +--:(md-name-null)
           |     +--rw md-name-null? empty
           +--rw md-level?           md-level
           Snippet of Data Hierarchy Related to OAM Domains

4.2. Maintenance Association (MA) Configuration

 Within a given Maintenance Domain, there can be one or more
 Maintenance Associations (MAs).  MAs are represented as a list and
 indexed by the "ma-name-string".  Similar to "md-name" defined
 previously, additional name formats can be added by augmenting the
 name-format "identity-ref" and adding applicable case statements to
 "ma-name".
    module: ietf-connection-oriented-oam
     +--rw domains
        +--rw domain* [technology md-name-string]
           .
           .
           +--rw mas
              +--rw ma* [ma-name-string]
                 +--rw ma-name-string          ma-name-string
                 +--rw ma-name-format?         identityref
                 +--rw (ma-name)?
                 |  +--:(ma-name-null)
                 |     +--rw ma-name-null?     empty
  Snippet of Data Hierarchy Related to Maintenance Associations (MAs)

Kumar, et al. Standards Track [Page 10] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

4.3. Maintenance End Point (MEP) Configuration

 Within a given Maintenance Association (MA), there can be one or more
 Maintenance End Points (MEPs).  MEPs are represented as a list within
 the data hierarchy and indexed by the key "mep-name".
    module: ietf-connection-oriented-oam
     +--rw domains
        +--rw domain* [technology md-name-string]
           +--rw technology                  identityref
           .
           .
           +--rw mas
              +--rw ma* [ma-name-string]
                 .
                 .
                 +--rw mep* [mep-name]
                 |  +--rw mep-name         mep-name
                 |  +--rw (mep-id)?
                 |  |  +--:(mep-id-int)
                 |  |     +--rw mep-id-int?      int32
                 |  +--rw mep-id-format?   identityref
                 |  +--rw (mep-address)?
                 |  |  +--:(mac-address)
                 |  |  |  +--rw mac-address?     yang:mac-address
                 |  |  +--:(ip-address)
                 |  |     +--rw ip-address?      inet:ip-address
                   .          .
                   .          .
                   .          .
   Snippet of Data Hierarchy Related to Maintenance End Point (MEP)

4.4. RPC Definitions

 The RPC model facilitates issuing commands to a "server" (in this
 case, to the device that need to execute the OAM command) and
 obtaining a response.  The RPC model defined here abstracts OAM-
 specific commands in a technology-independent manner.
 There are several RPC commands defined for the purpose of OAM.  In
 this section, we present a snippet of the Continuity Check command
 for illustration purposes.  Please refer to Section 4.5 for the
 complete data hierarchy and Section 5 for the YANG module.

Kumar, et al. Standards Track [Page 11] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

 module: ietf-connection-oriented-oam
     +--rw domains
           +--rw domain* [technology md-name-string]
           +--rw technology        identityref
     .
     .
 rpcs:
   +---x continuity-check {continuity-check}?
   |  +---w input
   |  |  +---w technology?             identityref
   |  |  +---w md-name-string -> /domains/domain/md-name-string
   |  |  +---w md-level?      -> /domains/domain/md-level
   |  |  +---w ma-name-string -> /domains/domain/mas/ma/ma-name-string
   |  |  +---w cos-id?                 uint8
   |  |  +---w ttl?                    uint8
   |  |  +---w sub-type?               identityref
   |  |  +---w source-mep?    -> /domains/domain/mas/ma/mep/mep-name
   |  |  +---w destination-mep
   |  |  |  +---w (mep-address)?
   |  |  |  |  +--:(mac-address)
   |  |  |  |  |  +---w mac-address?     yang:mac-address
   |  |  |  |  +--:(ip-address)
   |  |  |  |     +---w ip-address?      inet:ip-address
   |  |  |  +---w (mep-id)?
   |  |  |  |  +--:(mep-id-int)
   |  |  |  |     +---w mep-id-int?      int32
   |  |  |  +---w mep-id-format?   identityref
   |  |  +---w count?                  uint32
   |  |  +---w cc-transmit-interval?   time-interval
   |  |  +---w packet-size?            uint32
   |  +--ro output
   |     +--ro (monitor-stats)?
   |        +--:(monitor-null)
   |           +--ro monitor-null?   empty
   +---x continuity-verification {connectivity-verification}?
   |  +---w input
   |  |  +---w md-name-string -> /domains/domain/md-name-string
   |  |  +---w md-level?      -> /domains/domain/md-level
   |  |  +---w ma-name-string -> /domains/domain/mas/ma/ma-name-string
   |  |  +---w cos-id?            uint8
   |  |  +---w ttl?               uint8
   |  |  +---w sub-type?          identityref
   |  |  +---w source-mep?    -> /domains/domain/mas/ma/mep/mep-name
   |  |  +---w destination-mep
   |  |  |  +---w (mep-address)?
   |  |  |  |  +--:(mac-address)
   |  |  |  |  |  +---w mac-address?     yang:mac-address
   |  |  |  |  +--:(ip-address)

Kumar, et al. Standards Track [Page 12] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

   |  |  |  |     +---w ip-address?      inet:ip-address
   |  |  |  +---w (mep-id)?
   |  |  |  |  +--:(mep-id-int)
   |  |  |  |     +---w mep-id-int?      int32
   |  |  |  +---w mep-id-format?   identityref
   |  |  +---w count?             uint32
   |  |  +---w interval?          time-interval
   |  |  +---w packet-size?       uint32
   |  +--ro output
   |     +--ro (monitor-stats)?
   |        +--:(monitor-null)
   |           +--ro monitor-null?   empty
   +---x traceroute {traceroute}?
      +---w input
      |  +---w md-name-string -> /domains/domain/md-name-string
      |  +---w md-level?      -> /domains/domain/md-level
      |  +---w ma-name-string -> /domains/domain/mas/ma/ma-name-string
      |  +---w cos-id?             uint8
      |  +---w ttl?                uint8
      |  +---w command-sub-type?   identityref
      |  +---w source-mep?    -> /domains/domain/mas/ma/mep/mep-name
      |  +---w destination-mep
      |  |  +---w (mep-address)?
      |  |  |  +--:(mac-address)
      |  |  |  |  +---w mac-address?     yang:mac-address
      |  |  |  +--:(ip-address)
      |  |  |     +---w ip-address?      inet:ip-address
      |  |  +---w (mep-id)?
      |  |  |  +--:(mep-id-int)
      |  |  |     +---w mep-id-int?      int32
      |  |  +---w mep-id-format?   identityref
      |  +---w count?              uint32
      |  +---w interval?           time-interval
      +--ro output
         +--ro response* [response-index]
            +--ro response-index     uint8
            +--ro ttl?               uint8
            +--ro destination-mep
            |  +--ro (mep-address)?
            |  |  +--:(mac-address)
            |  |  |  +--ro mac-address?     yang:mac-address
            |  |  +--:(ip-address)
            |  |     +--ro ip-address?      inet:ip-address
            |  +--ro (mep-id)?
            |  |  +--:(mep-id-int)
            |  |     +--ro mep-id-int?      int32
            |  +--ro mep-id-format?   identityref
            +--ro mip {mip}?

Kumar, et al. Standards Track [Page 13] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

            |  +--ro interface?     if:interface-ref
            |  +--ro (mip-address)?
            |     +--:(mac-address)
            |     |  +--ro mac-address?   yang:mac-address
            |     +--:(ip-address)
            |        +--ro ip-address?    inet:ip-address
            +--ro (monitor-stats)?
               +--:(monitor-null)
                  +--ro monitor-null?      empty
    Snippet of Data Hierarchy Related to RPC Call Continuity-Check

4.5. Notifications

 Notification is sent upon detecting a defect condition and upon
 clearing a defect with a Maintenance Domain Name, MA Name, defect-
 type (the currently active defects), generating-mepid, and defect-
 message to indicate more details.

4.6. Monitor Statistics

 Grouping for monitoring statistics is to be used by technology-
 specific YANG modules that augment the generic YANG data model to
 provide statistics due to proactive OAM-like Continuity Check
 Messages -- for example, CCM transmit, CCM receive, CCM error, etc.

4.7. OAM Data Hierarchy

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

module: ietf-connection-oriented-oam

   +--rw domains
      +--rw domain* [technology md-name-string]
         +--rw technology        identityref
         +--rw md-name-string    md-name-string
         +--rw md-name-format?   identityref
         +--rw (md-name)?
         |  +--:(md-name-null)
         |     +--rw md-name-null?     empty
         +--rw md-level?         md-level
         +--rw mas
            +--rw ma* [ma-name-string]
               +--rw ma-name-string    ma-name-string
               +--rw ma-name-format?   identityref
               +--rw (ma-name)?
               |  +--:(ma-name-null)
               |     +--rw ma-name-null?     empty

Kumar, et al. Standards Track [Page 14] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

               +--rw (connectivity-context)?
               |  +--:(context-null)
               |     +--rw context-null?     empty
               +--rw cos-id?           uint8
               +--rw cc-enable?        boolean
               +--rw mep* [mep-name]
               |  +--rw mep-name         mep-name
               |  +--rw (mep-id)?
               |  |  +--:(mep-id-int)
               |  |     +--rw mep-id-int?      int32
               |  +--rw mep-id-format?   identityref
               |  +--rw (mep-address)?
               |  |  +--:(mac-address)
               |  |  |  +--rw mac-address?     yang:mac-address
               |  |  +--:(ip-address)
               |  |     +--rw ip-address?      inet:ip-address
               |  +--rw cos-id?          uint8
               |  +--rw cc-enable?       boolean
               |  +--rw session* [session-cookie]
               |     +--rw session-cookie             uint32
               |     +--rw destination-mep
               |     |  +--rw (mep-id)?
               |     |  |  +--:(mep-id-int)
               |     |  |     +--rw mep-id-int?      int32
               |     |  +--rw mep-id-format?   identityref
               |     +--rw destination-mep-address
               |     |  +--rw (mep-address)?
               |     |     +--:(mac-address)
               |     |     |  +--rw mac-address?   yang:mac-address
               |     |     +--:(ip-address)
               |     |        +--rw ip-address?    inet:ip-address
               |     +--rw cos-id?                    uint8
               +--rw mip* [name] {mip}?
                  +--rw name           string
                  +--rw interface?     if:interface-ref
                  +--rw (mip-address)?
                     +--:(mac-address)
                     |  +--rw mac-address?   yang:mac-address
                     +--:(ip-address)
                        +--rw ip-address?    inet:ip-address
 rpcs:
   +---x continuity-check {continuity-check}?
   |  +---w input
   |  |  +---w technology?             identityref
   |  |  +---w md-name-string -> /domains/domain/md-name-string
   |  |  +---w md-level?      -> /domains/domain/md-level
   |  |  +---w ma-name-string -> /domains/domain/mas/ma/ma-name-string

Kumar, et al. Standards Track [Page 15] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

   |  |  +---w cos-id?                 uint8
   |  |  +---w ttl?                    uint8
   |  |  +---w sub-type?               identityref
   |  |  +---w source-mep?    -> /domains/domain/mas/ma/mep/mep-name
   |  |  +---w destination-mep
   |  |  |  +---w (mep-address)?
   |  |  |  |  +--:(mac-address)
   |  |  |  |  |  +---w mac-address?     yang:mac-address
   |  |  |  |  +--:(ip-address)
   |  |  |  |     +---w ip-address?      inet:ip-address
   |  |  |  +---w (mep-id)?
   |  |  |  |  +--:(mep-id-int)
   |  |  |  |     +---w mep-id-int?      int32
   |  |  |  +---w mep-id-format?   identityref
   |  |  +---w count?                  uint32
   |  |  +---w cc-transmit-interval?   time-interval
   |  |  +---w packet-size?            uint32
   |  +--ro output
   |     +--ro (monitor-stats)?
   |        +--:(monitor-null)
   |           +--ro monitor-null?   empty
   +---x continuity-verification {connectivity-verification}?
   |  +---w input
   |  |  +---w md-name-string -> /domains/domain/md-name-string
   |  |  +---w md-level?      -> /domains/domain/md-level
   |  |  +---w ma-name-string -> /domains/domain/mas/ma/ma-name-string
   |  |  +---w cos-id?            uint8
   |  |  +---w ttl?               uint8
   |  |  +---w sub-type?          identityref
   |  |  +---w source-mep?    -> /domains/domain/mas/ma/mep/mep-name
   |  |  +---w destination-mep
   |  |  |  +---w (mep-address)?
   |  |  |  |  +--:(mac-address)
   |  |  |  |  |  +---w mac-address?     yang:mac-address
   |  |  |  |  +--:(ip-address)
   |  |  |  |     +---w ip-address?      inet:ip-address
   |  |  |  +---w (mep-id)?
   |  |  |  |  +--:(mep-id-int)
   |  |  |  |     +---w mep-id-int?      int32
   |  |  |  +---w mep-id-format?   identityref
   |  |  +---w count?             uint32
   |  |  +---w interval?          time-interval
   |  |  +---w packet-size?       uint32
   |  +--ro output
   |     +--ro (monitor-stats)?
   |        +--:(monitor-null)
   |           +--ro monitor-null?   empty
   +---x traceroute {traceroute}?

Kumar, et al. Standards Track [Page 16] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

      +---w input
      |  +---w md-name-string -> /domains/domain/md-name-string
      |  +---w md-level?      -> /domains/domain/md-level
      |  +---w ma-name-string -> /domains/domain/mas/ma/ma-name-string
      |  +---w cos-id?             uint8
      |  +---w ttl?                uint8
      |  +---w command-sub-type?   identityref
      |  +---w source-mep?    -> /domains/domain/mas/ma/mep/mep-name
      |  +---w destination-mep
      |  |  +---w (mep-address)?
      |  |  |  +--:(mac-address)
      |  |  |  |  +---w mac-address?     yang:mac-address
      |  |  |  +--:(ip-address)
      |  |  |     +---w ip-address?      inet:ip-address
      |  |  +---w (mep-id)?
      |  |  |  +--:(mep-id-int)
      |  |  |     +---w mep-id-int?      int32
      |  |  +---w mep-id-format?   identityref
      |  +---w count?              uint32
      |  +---w interval?           time-interval
      +--ro output
         +--ro response* [response-index]
            +--ro response-index     uint8
            +--ro ttl?               uint8
            +--ro destination-mep
            |  +--ro (mep-address)?
            |  |  +--:(mac-address)
            |  |  |  +--ro mac-address?     yang:mac-address
            |  |  +--:(ip-address)
            |  |     +--ro ip-address?      inet:ip-address
            |  +--ro (mep-id)?
            |  |  +--:(mep-id-int)
            |  |     +--ro mep-id-int?      int32
            |  +--ro mep-id-format?   identityref
            +--ro mip {mip}?
            |  +--ro interface?     if:interface-ref
            |  +--ro (mip-address)?
            |     +--:(mac-address)
            |     |  +--ro mac-address?   yang:mac-address
            |     +--:(ip-address)
            |        +--ro ip-address?    inet:ip-address
            +--ro (monitor-stats)?
               +--:(monitor-null)
                  +--ro monitor-null?      empty

Kumar, et al. Standards Track [Page 17] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

 notifications:
   +---n defect-condition-notification
   |  +--ro technology?         identityref
   |  +--ro md-name-string -> /domains/domain/md-name-string
   |  +--ro ma-name-string -> /domains/domain/mas/ma/ma-name-string
   |  +--ro mep-name?      -> /domains/domain/mas/ma/mep/mep-name
   |  +--ro defect-type?        identityref
   |  +--ro generating-mepid
   |  |  +--ro (mep-id)?
   |  |  |  +--:(mep-id-int)
   |  |  |     +--ro mep-id-int?      int32
   |  |  +--ro mep-id-format?   identityref
   |  +--ro (defect)?
   |     +--:(defect-null)
   |     |  +--ro defect-null?        empty
   |     +--:(defect-code)
   |        +--ro defect-code?        int32
   +---n defect-cleared-notification
      +--ro technology?         identityref
      +--ro md-name-string -> /domains/domain/md-name-string
      +--ro ma-name-string -> /domains/domain/mas/ma/ma-name-string
      +--ro mep-name?      -> /domains/domain/mas/ma/mep/mep-name
      +--ro defect-type?        identityref
      +--ro generating-mepid
      |  +--ro (mep-id)?
      |  |  +--:(mep-id-int)
      |  |     +--ro mep-id-int?      int32
      |  +--ro mep-id-format?   identityref
      +--ro (defect)?
         +--:(defect-null)
         |  +--ro defect-null?        empty
         +--:(defect-code)
            +--ro defect-code?        int32
                         Data Hierarchy of OAM

Kumar, et al. Standards Track [Page 18] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

5. OAM YANG Module

 This module imports typedefs from [RFC6991] and [RFC8343], and it
 references [RFC6371], [RFC6905], and [RFC7276].
 <CODE BEGINS> file "ietf-connection-oriented-oam@2019-04-16.yang"

module ietf-connection-oriented-oam {

yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-connection-oriented-oam";
prefix co-oam;
import ietf-yang-types {
  prefix yang;
}
import ietf-inet-types {
  prefix inet;
}
import ietf-interfaces {
  prefix if;
}
organization
  "IETF LIME Working Group";
contact
  "WG Web:    http://datatracker.ietf.org/wg/lime
   WG List:   <mailto:lime@ietf.org>
   Editor:    Deepak Kumar <dekumar@cisco.com>
   Editor:    Qin Wu <bill.wu@huawei.com>
   Editor:    Michael Wang <wangzitao@huawei.com>";
description
  "This YANG module defines the generic configuration,
   statistics and RPC for connection-oriented OAM
   to be used within IETF in a protocol-independent manner.
   Functional-level abstraction is independent
   with YANG modeling. It is assumed that each protocol
   maps corresponding abstracts to its native format.
   Each protocol may extend the YANG data model defined
   here to include protocol-specific extensions
   Copyright (c) 2019 IETF Trust and the persons identified as
   authors of the code.  All rights reserved.
   Redistribution and use in source and binary forms, with or
   without modification, is permitted pursuant to, and subject
   to the license terms contained in, the Simplified BSD License
   set forth in Section 4.c of the IETF Trust's Legal Provisions
   Relating to IETF Documents

Kumar, et al. Standards Track [Page 19] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

   (http://trustee.ietf.org/license-info).
   This version of this YANG module is part of RFC 8531; see
   the RFC itself for full legal notices.";
revision 2019-04-16 {
  description
    "Initial revision.";
  reference
    "RFC 8531: Generic YANG Data Model for Connection-
     Oriented Operations, Administration, and Maintenance (OAM)
     Protocols";
}
feature connectivity-verification {
  description
    "This feature indicates that the server supports
     executing a connectivity verification OAM command and
     returning a response.  Servers that do not advertise
     this feature will not support executing a
     connectivity verification command or RPC model for a
     connectivity verification command.";
}
feature continuity-check {
  description
    "This feature indicates that the server supports
     executing a Continuity Check OAM command and
     returning a response.  Servers that do not advertise
     this feature will not support executing a
     Continuity Check command or RPC model for a
     Continuity Check command.";
}
feature traceroute {
  description
    "This feature indicates that the server supports
     executing a traceroute OAM command and
     returning a response.  Servers that do not advertise
     this feature will not support executing a
     traceroute command or RPC model for a
     traceroute command.";
}
feature mip {
  description
    "This feature indicates that the Maintenance
     Intermediate Point (MIP) needs to be explicitly configured";

Kumar, et al. Standards Track [Page 20] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

}
identity technology-types {
  description
    "This is the base identity of technology types that are
     TRILL, MPLS-TP, etc.";
}
identity command-sub-type {
  description
    "Defines different RPC command subtypes,
     e.g., TRILL OAM as specified in RFC 6905; this is
     optional for most cases.";
  reference
    "RFC 6905: Requirements for OAM in Transparent
     Interconnection of Lots of Links (TRILL)";
}
identity on-demand {
  base command-sub-type;
  description
    "On-demand activation indicates that the tool is activated
     manually to detect a specific anomaly.
     An on-demand OAM method requires only transient configuration.";
  reference
    "RFC 7276: An Overview of Operations, Administration, and
     Maintenance (OAM) Tools";
}
identity proactive {
  base command-sub-type;
  description
    "Proactive activation indicates that the tool is activated on a
     continual basis, where messages are sent periodically, and errors
     are detected when a certain number of expected messages are not
     received.  A proactive OAM method requires persistent
     configuration.";
  reference
    "RFC 7276: An Overview of Operations, Administration, and
     Maintenance (OAM) Tools";
}
identity name-format {
  description
    "This defines the name format, CFM (IEEE 802.1Q) defines varying
     styles of names.  It is expected that name format is an identity
     reference to be extended with new types.";
}

Kumar, et al. Standards Track [Page 21] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

identity name-format-null {
  base name-format;
  description
    "Defines name format as null.";
}
identity identifier-format {
  description
    "Identifier-format identity can be augmented to define other
     format identifiers used in MEP-ID, etc.";
}
identity identifier-format-integer {
  base identifier-format;
  description
    "Defines identifier-format to be integer.";
}
identity defect-types {
  description
    "Defines different defect types, e.g.,
     Remote Defect Indication (RDI), loss of continuity.";
}
identity rdi {
  base defect-types;
  description
    "The RDI indicates the
     aggregate health of the remote Maintenance End Points (MEPs).";
}
identity remote-mep-defect {
  base defect-types;
  description
    "Indicates that one or more of the remote MEPs are
     reporting a failure.";
}
identity loss-of-continuity {
  base defect-types;
  description
    "Indicates that there are no proactive Continuity Check (CC)
     OAM packets from the source MEP (and in the case of
     Connectivity Verification, this includes the requirement to have
     the expected unique, technology-dependent source MEP identifier)
     received within the interval.";
  reference
    "RFC 6371: Operations, Administration, and Maintenance

Kumar, et al. Standards Track [Page 22] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

     Framework for MPLS-Based Transport Networks";
}
identity cv-defect {
  base defect-types;
  description
    "This function should support monitoring between the MEPs
     and, in addition, between a MEP and MIP.  When performing
     Connectivity Verification, the Continuity Check and
     Connectivity Verification (CC-V) messages need to include
     unique identification of the MEG that is being monitored and
     the MEP that originated the message.";
  reference
    "RFC 6371: Operations, Administration, and Maintenance
     Framework for MPLS-Based Transport Networks";
}
identity invalid-oam-defect {
  base defect-types;
  description
    "Indicates that one or more invalid OAM messages have been
     received and that 3.5 times that OAM message transmission
     interval has not yet expired.";
}
identity cross-connect-defect {
  base defect-types;
  description
    "Indicates that one or more cross-connect defect
     (for example, a service ID does not match the VLAN)
     messages have been received and that 3.5 times that OAM message
     transmission interval has not yet expired.";
}
typedef mep-name {
  type string;
  description
    "Generic administrative name for a MEP.";
}
typedef time-interval {
  type decimal64 {
    fraction-digits 2;
  }
  units "milliseconds";
  description
    "Time interval between packets in milliseconds.
     Time interval should not be less than 0.

Kumar, et al. Standards Track [Page 23] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

     0 means no packets are sent.";
}
typedef md-name-string {
  type string;
  description
    "Generic administrative name for Maintenance Domain (MD).";
}
typedef ma-name-string {
  type string;
  description
    "Generic administrative name for a
     Maintenance Association (MA).";
}
typedef oam-counter32 {
  type yang:zero-based-counter32;
  description
    "Define 32-bit counter for OAM.";
}
typedef md-level {
  type uint32 {
    range "0..255";
  }
  description
    "Maintenance Domain Level.  The level may be restricted in
     certain protocols (e.g., protocol in layer 0 to layer 7).";
}
grouping maintenance-domain-reference {
  description
    "This grouping uniquely identifies a Maintenance Domain.";
  leaf maintenance-domain {
    type leafref {
      path "/co-oam:domains/co-oam:domain/co-oam:md-name-string";
    }
    description
      "A reference to a specific Maintenance Domain.";
  }
}
grouping maintenance-association-reference {
  description
    "This grouping uniquely identifies a
     Maintenance Association.  It consists
     of a maintenance-domain-reference and

Kumar, et al. Standards Track [Page 24] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

     a maintenance-association leafref.";
  uses maintenance-domain-reference;
  leaf maintenance-association {
    type leafref {
      path "/co-oam:domains/co-oam:domain[co-oam:md-name-string "
         + "= current()/../maintenance-domain]/co-oam:mas"
         + "/co-oam:ma/co-oam:ma-name-string";
    }
    description
      "A reference to a specific Maintenance Association.";
  }
}
grouping maintenance-association-end-point-reference {
  description
    "This grouping uniquely identifies
     a Maintenance Association.  It consists
     of a maintenance-association-reference and
     a maintenance-association-end-point leafref.";
  uses maintenance-association-reference;
  leaf maintenance-association-end-point {
    type leafref {
      path "/co-oam:domains/co-oam:domain[co-oam:md-name-string "
         + "= current()/../maintenance-domain]/co-oam:mas"
         + "/co-oam:ma[co-oam:ma-name-string = "
         + "current()/../maintenance-association]"
         + "/co-oam:mep/co-oam:mep-name";
    }
    description
      "A reference to a specific Maintenance
       association End Point.";
  }
}
grouping time-to-live {
  leaf ttl {
    type uint8;
    description
      "Time to Live.";
  }
  description
    "Time to Live grouping.";
}
grouping defect-message {
  choice defect {
    case defect-null {
      description

Kumar, et al. Standards Track [Page 25] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

        "This is a placeholder when no defect status is needed.";
      leaf defect-null {
        type empty;
        description
          "There is no defect to be defined; it will be defined in
           a technology-specific model.";
      }
    }
    case defect-code {
      description
        "This is a placeholder to display defect code.";
      leaf defect-code {
        type int32;
        description
          "Defect code is integer value specific to a technology.";
      }
    }
    description
      "Defect Message choices.";
  }
  description
    "Defect Message.";
}
grouping mep-address {
  choice mep-address {
    default "ip-address";
    case mac-address {
      leaf mac-address {
        type yang:mac-address;
        description
          "MAC Address.";
      }
      description
        "MAC Address based MEP Addressing.";
    }
    case ip-address {
      leaf ip-address {
        type inet:ip-address;
        description
          "IP Address.";
      }
      description
        "IP Address based MEP Addressing.";
    }
    description
      "MEP Addressing.";
  }

Kumar, et al. Standards Track [Page 26] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

  description
    "Grouping for MEP Address";
}
grouping mip-address {
  choice mip-address {
    default "ip-address";
    case mac-address {
      leaf mac-address {
        type yang:mac-address;
        description
          "MAC Address of Maintenance Intermediate Point";
      }
      description
        "MAC Address based MIP Addressing.";
    }
    case ip-address {
      leaf ip-address {
        type inet:ip-address;
        description
          "IP Address.";
      }
      description
        "IP Address based MIP Addressing.";
    }
    description
      "MIP Addressing.";
  }
  description
    "MIP Address.";
}
grouping maintenance-domain-id {
  description
    "Grouping containing leaves sufficient to identify
     a Maintenance Domain.";
  leaf technology {
    type identityref {
      base technology-types;
    }
    mandatory true;
    description
      "Defines the technology.";
  }
  leaf md-name-string {
    type md-name-string;
    mandatory true;
    description

Kumar, et al. Standards Track [Page 27] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

      "Defines the generic administrative Maintenance Domain name.";
  }
}
grouping md-name {
  leaf md-name-format {
    type identityref {
      base name-format;
    }
    description
      "Maintenance Domain Name format.";
  }
  choice md-name {
    case md-name-null {
      leaf md-name-null {
        when "derived-from-or-self(../md-name-format,"
           + "'name-format-null')" {
          description
            "MD name format is equal to null format.";
        }
        type empty;
        description
          "MD name null.";
      }
    }
    description
      "MD name.";
  }
  description
    "MD name.";
}
grouping ma-identifier {
  description
    "Grouping containing leaves sufficient to identify an MA.";
  leaf ma-name-string {
    type ma-name-string;
    description
      "MA name string.";
  }
}
grouping ma-name {
  description
    "MA name.";
  leaf ma-name-format {
    type identityref {
      base name-format;

Kumar, et al. Standards Track [Page 28] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

    }
    description
      "MA name format.";
  }
  choice ma-name {
    case ma-name-null {
      leaf ma-name-null {
        when "derived-from-or-self(../ma-name-format,"
           + "'name-format-null')" {
          description
            "MA.";
        }
        type empty;
        description
          "Empty";
      }
    }
    description
      "MA name.";
  }
}
grouping mep-id {
  choice mep-id {
    default "mep-id-int";
    case mep-id-int {
      leaf mep-id-int {
        type int32;
        description
          "MEP ID
           in integer format.";
      }
    }
    description
      "MEP ID.";
  }
  leaf mep-id-format {
    type identityref {
      base identifier-format;
    }
    description
      "MEP ID format.";
  }
  description
    "MEP ID.";
}
grouping mep {

Kumar, et al. Standards Track [Page 29] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

  description
    "Defines elements within the MEP.";
  leaf mep-name {
    type mep-name;
    mandatory true;
    description
      "Generic administrative name of the
       MEP.";
  }
  uses mep-id;
  uses mep-address;
}
grouping monitor-stats {
  description
    "Grouping for monitoring statistics; this will be augmented
     by others who use this component.";
  choice monitor-stats {
    default "monitor-null";
    case monitor-null {
      description
        "This is a placeholder when
         no monitoring statistics are needed.";
      leaf monitor-null {
        type empty;
        description
          "There are no monitoring statistics to be defined.";
      }
    }
    description
      "Define the monitor stats.";
  }
}
grouping connectivity-context {
  description
    "Grouping defining the connectivity context for an MA,
     for example, an LSP for MPLS-TP.  This will be
     augmented by each protocol that uses this component.";
  choice connectivity-context {
    default "context-null";
    case context-null {
      description
        "This is a placeholder when no context is needed.";
      leaf context-null {
        type empty;
        description
          "There is no context to be defined.";

Kumar, et al. Standards Track [Page 30] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

      }
    }
    description
      "Connectivity context.";
  }
}
grouping cos {
  description
    "Grouping for Priority used in transmitted packets,
     for example, in the CoS field in MPLS-TP.";
  leaf cos-id {
    type uint8;
    description
      "Class of Service (CoS) ID; this value is used to indicate
       Class of Service information .";
  }
}
grouping mip-grouping {
  uses mip-address;
  description
    "Grouping for MIP
     configuration.";
}
container domains {
  description
    "Contains configuration related data.  Within the
     container, there is a list of fault domains.  Each
     domain has a list of MAs.";
  list domain {
    key "technology md-name-string";
    description
      "Define a list of Domains within the
       ietf-connection-oriented-oam module.";
    uses maintenance-domain-id;
    uses md-name;
    leaf md-level {
      type md-level;
      description
        "Define the MD level.";
    }
    container mas {
      description
        "Contains configuration-related data.  Within the
         container, there is a list of MAs.  Each MA has a
         list of MEPs.";

Kumar, et al. Standards Track [Page 31] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

      list ma {
        key "ma-name-string";
        uses ma-identifier;
        uses ma-name;
        uses connectivity-context;
        uses cos {
          description
            "Default class of service for this MA;
             it may be overridden for particular MEPs,
             sessions, or operations.";
        }
        leaf cc-enable {
          type boolean;
          description
            "Indicate whether the CC is enabled.";
        }
        list mep {
          key "mep-name";
          description
            "Contain a list of MEPs.";
          uses mep;
          uses cos;
          leaf cc-enable {
            type boolean;
            description
              "Indicate whether the CC is enabled.";
          }
          list session {
            key "session-cookie";
            description
              "Monitoring session to/from a particular remote MEP.
               Depending on the protocol, this could represent
               CC messages received from a single remote MEP (if the
               protocol uses multicast CCs) or a target to which
               unicast echo request CCs are sent and from which
               responses are received (if the protocol uses a
               unicast request/response mechanism).";
            leaf session-cookie {
              type uint32;
              description
                "Cookie to identify different sessions, when there
                 are multiple remote MEPs or multiple sessions to
                 the same remote MEP.";
            }
            container destination-mep {
              uses mep-id;
              description
                "Destination MEP.";

Kumar, et al. Standards Track [Page 32] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

            }
            container destination-mep-address {
              uses mep-address;
              description
                "Destination MEP Address.";
            }
            uses cos;
          }
        }
        list mip {
          if-feature "mip";
          key "name";
          leaf name {
            type string;
            description
              "Identifier of Maintenance Intermediate Point";
          }
          leaf interface {
            type if:interface-ref;
            description
              "Interface.";
          }
          uses mip-grouping;
          description
            "List for MIP.";
        }
        description
          "Maintenance Association list.";
      }
    }
  }
}
notification defect-condition-notification {
  description
    "When the defect condition is met, this notification is sent.";
  leaf technology {
    type identityref {
      base technology-types;
    }
    description
      "The technology.";
  }
  leaf md-name-string {
    type leafref {
      path "/domains/domain/md-name-string";
    }
    mandatory true;

Kumar, et al. Standards Track [Page 33] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

    description
      "Indicate which MD the defect belongs to.";
  }
  leaf ma-name-string {
    type leafref {
      path "/domains/domain/mas/ma/ma-name-string";
    }
    mandatory true;
    description
      "Indicate which MA the defect is associated with.";
  }
  leaf mep-name {
    type leafref {
      path "/domains/domain/mas/ma/mep/mep-name";
    }
    description
      "Indicate which MEP is seeing the defect.";
  }
  leaf defect-type {
    type identityref {
      base defect-types;
    }
    description
      "The currently active defects on the specific MEP.";
  }
  container generating-mepid {
    uses mep-id;
    description
      "Indicate who is generating the defect (if known). If
       unknown, set it to 0.";
  }
  uses defect-message {
    description
      "Defect message to provide more details.";
  }
}
notification defect-cleared-notification {
  description
    "When the defect is cleared, this notification is sent.";
  leaf technology {
    type identityref {
      base technology-types;
    }
    description
      "The technology.";
  }
  leaf md-name-string {

Kumar, et al. Standards Track [Page 34] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

    type leafref {
      path "/domains/domain/md-name-string";
    }
    mandatory true;
    description
      "Indicate which MD the defect belongs to";
  }
  leaf ma-name-string {
    type leafref {
      path "/domains/domain/mas/ma/ma-name-string";
    }
    mandatory true;
    description
      "Indicate which MA the defect is associated with.";
  }
  leaf mep-name {
    type leafref {
      path "/domains/domain/mas/ma/mep/mep-name";
    }
    description
      "Indicate which MEP is seeing the defect.";
  }
  leaf defect-type {
    type identityref {
      base defect-types;
    }
    description
      "The currently active defects on the specific MEP.";
  }
  container generating-mepid {
    uses mep-id;
    description
      "Indicate who is generating the defect (if known). If
       unknown, set it to 0.";
  }
  uses defect-message {
    description
      "Defect message to provide more details.";
  }
}
rpc continuity-check {
  if-feature "continuity-check";
  description
    "Generates Continuity Check as per Table 4 of RFC 7276.";
  input {
    leaf technology {
      type identityref {

Kumar, et al. Standards Track [Page 35] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

        base technology-types;
      }
      description
        "The technology.";
    }
    leaf md-name-string {
      type leafref {
        path "/domains/domain/md-name-string";
      }
      mandatory true;
      description
        "Indicate which MD the defect belongs to.";
    }
    leaf md-level {
      type leafref {
        path "/domains/domain/md-level";
      }
      description
        "The Maintenance Domain Level.";
    }
    leaf ma-name-string {
      type leafref {
        path "/domains/domain/mas/ma/ma-name-string";
      }
      mandatory true;
      description
        "Indicate which MA the defect is associated with.";
    }
    uses cos;
    uses time-to-live;
    leaf sub-type {
      type identityref {
        base command-sub-type;
      }
      description
        "Defines different command types.";
    }
    leaf source-mep {
      type leafref {
        path "/domains/domain/mas/ma/mep/mep-name";
      }
      description
        "Source MEP.";
    }
    container destination-mep {
      uses mep-address;
      uses mep-id {
        description

Kumar, et al. Standards Track [Page 36] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

          "Only applicable if the destination is a MEP.";
      }
      description
        "Destination MEP.";
    }
    leaf count {
      type uint32;
      default "3";
      description
        "Number of continuity-check messages to be sent.";
    }
    leaf cc-transmit-interval {
      type time-interval;
      description
        "Time interval between echo requests.";
    }
    leaf packet-size {
      type uint32 {
        range "64..10000";
      }
      description
        "Size of continuity-check packets, in octets.";
    }
  }
  output {
    uses monitor-stats {
      description
        "Stats of Continuity Check.";
    }
  }
}
rpc continuity-verification {
  if-feature "connectivity-verification";
  description
    "Generates Connectivity Verification as per Table 4 in RFC 7276.";
  input {
    leaf md-name-string {
      type leafref {
        path "/domains/domain/md-name-string";
      }
      mandatory true;
      description
        "Indicate which MD the defect belongs to.";
    }
    leaf md-level {
      type leafref {
        path "/domains/domain/md-level";

Kumar, et al. Standards Track [Page 37] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

      }
      description
        "The Maintenance Domain Level.";
    }
    leaf ma-name-string {
      type leafref {
        path "/domains/domain/mas/ma/ma-name-string";
      }
      mandatory true;
      description
        "Indicate which MA the defect is associated with.";
    }
    uses cos;
    uses time-to-live;
    leaf sub-type {
      type identityref {
        base command-sub-type;
      }
      description
        "Defines different command types.";
    }
    leaf source-mep {
      type leafref {
        path "/domains/domain/mas/ma/mep/mep-name";
      }
      description
        "Source MEP.";
    }
    container destination-mep {
      uses mep-address;
      uses mep-id {
        description
          "Only applicable if the destination is a MEP.";
      }
      description
        "Destination MEP.";
    }
    leaf count {
      type uint32;
      default "3";
      description
        "Number of continuity-verification messages to be sent.";
    }
    leaf interval {
      type time-interval;
      description
        "Time interval between echo requests.";
    }

Kumar, et al. Standards Track [Page 38] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

    leaf packet-size {
      type uint32 {
        range "64..10000";
      }
      description
        "Size of continuity-verification packets, in octets.";
    }
  }
  output {
    uses monitor-stats {
      description
        "Stats of Continuity Check.";
    }
  }
}
rpc traceroute {
  if-feature "traceroute";
  description
    "Generates Traceroute or Path Trace and returns response.
     References RFC 7276 for common Toolset name -- for
     MPLS-TP OAM, it's Route Tracing, and for TRILL OAM, it's
     Path Tracing tool.  Starts with TTL of one and increments
     by one at each hop until the destination is reached or TTL
     reaches max value.";
  input {
    leaf md-name-string {
      type leafref {
        path "/domains/domain/md-name-string";
      }
      mandatory true;
      description
        "Indicate which MD the defect belongs to.";
    }
    leaf md-level {
      type leafref {
        path "/domains/domain/md-level";
      }
      description
        "The Maintenance Domain Level.";
    }
    leaf ma-name-string {
      type leafref {
        path "/domains/domain/mas/ma/ma-name-string";
      }
      mandatory true;
      description
        "Indicate which MA the defect is associated with.";

Kumar, et al. Standards Track [Page 39] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

    }
    uses cos;
    uses time-to-live;
    leaf command-sub-type {
      type identityref {
        base command-sub-type;
      }
      description
        "Defines different command types.";
    }
    leaf source-mep {
      type leafref {
        path "/domains/domain/mas/ma/mep/mep-name";
      }
      description
        "Source MEP.";
    }
    container destination-mep {
      uses mep-address;
      uses mep-id {
        description
          "Only applicable if the destination is a MEP.";
      }
      description
        "Destination MEP.";
    }
    leaf count {
      type uint32;
      default "1";
      description
        "Number of traceroute probes to send.  In protocols where a
         separate message is sent at each TTL, this is the number
         of packets to be sent at each TTL.";
    }
    leaf interval {
      type time-interval;
      description
        "Time interval between echo requests.";
    }
  }
  output {
    list response {
      key "response-index";
      leaf response-index {
        type uint8;
        description
          "Arbitrary index for the response.  In protocols that
           guarantee there is only a single response at each TTL,

Kumar, et al. Standards Track [Page 40] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

           the TTL can be used as the response index.";
      }
      uses time-to-live;
      container destination-mep {
        description
          "MEP from which the response has been received";
        uses mep-address;
        uses mep-id {
          description
            "Only applicable if the destination is a MEP.";
        }
      }
      container mip {
        if-feature "mip";
        leaf interface {
          type if:interface-ref;
          description
            "MIP interface.";
        }
        uses mip-address;
        description
          "MIP responding with traceroute";
      }
      uses monitor-stats {
        description
          "Stats of traceroute.";
      }
      description
        "List of responses.";
    }
  }
}

}

 <CODE ENDS>

Kumar, et al. Standards Track [Page 41] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

6. Base Mode

 The Base Mode ("default mode" described in Section 4) defines the
 default configuration that MUST be present in the devices that comply
 with this document.  Base Mode allows users to have a "zero-touch"
 experience.  Several parameters require technology-specific
 definition.

6.1. MEP Address

 In the Base Mode of operation, the MEP Address is by default the IP
 address of the interface on which the MEP is located.

6.2. MEP ID for Base Mode

 In the Base Mode of operation, each device creates a single MEP
 associated with a virtual OAM port with no physical layer (NULL PHY).
 The MEP-ID associated with this MEP is zero (0).  The choice of
 MEP-ID of zero is explained below.
 MEP-ID is a 2-octet field by default.  It is never used on the wire
 except when using CCM.  It is important to have a method that can
 derive the MEP-ID of Base Mode in an automatic manner with no user
 intervention.  The IP address cannot be directly used for this
 purpose, as the MEP-ID is a much smaller field.  For the Base Mode of
 operation, MEP-ID is set to zero by default.
 The CCM packet uses the MEP-ID in the payload.  CCM MUST NOT be used
 in the Base Mode.  Hence, CCM MUST be disabled on the Maintenance
 Association of the Base Mode.
 If CCM is required, users MUST configure a separate Maintenance
 Association and assign unique values for the corresponding MEP IDs.
 CFM [IEEE802.1Q] defines MEP-ID as an unsigned integer in the range 1
 to 8191.  In this document, we propose extending the range to 0 to
 65535.  Value 0 is reserved for the MEP-ID in the Base Mode operation
 and MUST NOT be used for other purposes.

6.3. Maintenance Association

 The ID of the Maintenance Association (MA-ID) [IEEE802.1Q] has a
 flexible format and includes two parts: Maintenance Domain Name and
 Short MA name.  In the Base Mode of operation, the value of the
 Maintenance Domain Name must be the character string
 "GenericBaseMode" (excluding the quotes).  In the Base Mode

Kumar, et al. Standards Track [Page 42] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

 operation, the Short MA Name format is set to a 2-octet integer
 format (value 3 in Short MA Format field [IEEE802.1Q]) and the Short
 MA name is set to 65532 (0xFFFC).

7. Connection-Oriented OAM YANG Data Model Applicability

 The "ietf-connection-oriented-oam" module defined in this document
 provides a technology-independent abstraction of key OAM constructs
 for connection-oriented protocols.  This module 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 connection-oriented OAM model.
 This section demonstrates the usability of the connection-oriented
 YANG OAM data model to various connection-oriented OAM technologies,
 e.g., TRILL and MPLS-TP.  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.

7.1. Generic YANG Data Model Extension for TRILL OAM

 The TRILL OAM YANG module [TRILL-YANG-OAM] is augmenting the
 connection-oriented OAM module for both configuration and RPC
 commands.
 In addition,the TRILL OAM YANG module also requires the base TRILL
 module ([TRILL-YANG]) to be supported, as there is a strong
 relationship between those modules.
 The configuration extensions for connection-oriented OAM include the
 MD configuration extension, technology type extension, MA
 configuration extension, Connectivity-Context extension, MEP
 Configuration extension, and ECMP extension.  In the RPC extension,
 the continuity-check and path-discovery RPC are extended with TRILL-
 specific parameters.

7.1.1. MD Configuration Extension

 MD level configuration parameters are management information that can
 be inherited in the TRILL OAM model and set by the connection-
 oriented base model as default values.  For example, domain name can
 be set to area-ID in the TRILL OAM case.  In addition, at the
 Maintenance Domain Level (i.e., at root level), the domain data node
 can be augmented with technology type.

Kumar, et al. Standards Track [Page 43] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

 Note that MD level configuration parameters provide context
 information for the management system to correlate faults, defects,
 and network failures with location information; this helps quickly
 identify root causes of network failures.

7.1.1.1. Technology Type Extension

 No TRILL technology type has been defined in the connection-oriented
 base model.  Therefore, a technology type extension is required in
 the TRILL OAM model.  The technology type "trill" is defined as an
 identity that augments the base "technology-types" defined in the
 connection-oriented base model:
    identity trill{
     base co-oam:technology-types;
     description
      "trill type";
    }

7.1.2. MA Configuration Extension

 MA level configuration parameters are management information that can
 be inherited in the TRILL OAM model and set by the connection-
 oriented base model as default values.  In addition, at the
 Maintenance Association (MA) level (i.e., at the second level), the
 MA data node can be augmented with a connectivity-context extension.
 Note that MA level configuration parameters provide context
 information for the management system to correlate faults, defects,
 and network failures with location information; this helps quickly
 identify root causes of network failures.

7.1.2.1. Connectivity-Context Extension

 In TRILL OAM, one example of connectivity-context is either a 12-bit
 VLAN ID or a 24-bit Fine-Grained Label.  The connection-oriented base
 model defines a placeholder for context-id.  This allows other
 technologies to easily augment that to include technology-specific
 extensions.  The snippet below depicts an example of augmenting
 connectivity-context to include either a VLAN ID or Fine-Grained
 Label.
    augment /co-oam:domains/co-oam:domain
 /co-oam:mas/co-oam:ma/co-oam:connectivity-context:
          +--:(connectivity-context-vlan)
          |  +--rw connectivity-context-vlan?   vlan
          +--:(connectivity-context-fgl)
             +--rw connectivity-context-fgl?    fgl

Kumar, et al. Standards Track [Page 44] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

7.1.3. MEP Configuration Extension

 The MEP configuration definition in the connection-oriented base
 model already supports configuring the interface of MEP with either a
 MAC address or IP address.  In addition, the MEP address can be
 represented using a 2-octet RBridge Nickname in TRILL OAM.  Hence,
 the TRILL OAM model augments the MEP configuration in the base model
 to add a nickname case to the MEP address choice node as follows:
 augment /co-oam:domains/co-oam:domain
 /co-oam:mas/co-oam:ma/co-oam:mep/co-oam:mep-address:
          +--:( mep-address-trill)
          |  +--rw mep-address-trill?  tril-rb-nickname
 In addition, at the Maintenance association End Point (MEP) level
 (i.e., at the third level), the MEP data node can be augmented with
 an ECMP extension.

7.1.3.1. ECMP Extension

 Since TRILL supports ECMP path selection, flow-entropy in TRILL is
 defined as a 96-octet field in the Layer-Independent OAM Management
 in the Multi-Layer Environment (LIME) model extension for TRILL OAM.
 The snippet below illustrates its extension.
    augment /co-oam:domains/co-oam:domain
 /co-oam:mas/co-oam:ma/co-oam:mep:
             +--rw flow-entropy-trill?   flow-entropy-trill
    augment /co-oam:domains/co-oam:domain
 /co-oam:mas/co-oam:ma/co-oam:mep/co-oam:session:
             +--rw flow-entropy-trill?   flow-entropy-trill

Kumar, et al. Standards Track [Page 45] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

7.1.4. RPC Extension

 In the TRILL OAM YANG data model, the continuity-check and path-
 discovery RPC commands are extended with TRILL-specific requirements.
 The snippet below depicts an example of the TRILL OAM RPC extension.
    augment /co-oam:continuity-check/co-oam:input:
          +--ro (out-of-band)?
          |  +--:(ipv4-address)
          |  |  +--ro ipv4-address?      inet:ipv4-address
          |  +--:(ipv6-address)
          |  |  +--ro ipv6-address?      inet:ipv6-address
          |  +--:(trill-nickname)
          |     +--ro trill-nickname?    tril-rb-nickname
          +--ro diagnostic-vlan?   boolean
    augment /co-oam:continuity-check/co-oam:input:
             +--ro flow-entropy-trill?   flow-entropy-trill
    augment /co-oam:continuity-check/co-oam:output:
          +--ro upstream-rbridge?   tril-rb-nickname
          +--ro next-hop-rbridge*   tril-rb-nickname
    augment /co-oam:path-discovery/co-oam:input:
          +--ro (out-of-band)?
          |  +--:(ipv4-address)
          |  |  +--ro ipv4-address?      inet:ipv4-address
          |  +--:(ipv6-address)
          |  |  +--ro ipv6-address?      inet:ipv6-address
          |  +--:(trill-nickname)
          |     +--ro trill-nickname?    tril-rb-nickname
          +--ro diagnostic-vlan?   boolean
    augment /co-oam:path-discovery/co-oam:input:
             +--ro flow-entropy-trill?   flow-entropy-trill
    augment /co-oam:path-discovery/co-oam:output/co-oam:response:
          +--ro upstream-rbridge?   tril-rb-nickname
          +--ro next-hop-rbridge*   tril-rb-nickname

7.2. Generic YANG Data Model Extension for MPLS-TP OAM

 The MPLS-TP OAM YANG module can augment the connection-oriented OAM
 module with some technology-specific details.  [MPLS-TP-OAM-YANG]
 presents the YANG data model for MPLS-TP OAM.
 The configuration extensions for connection-oriented OAM include the
 MD configuration extension, Technology type extension, Technology
 Subtype extension, MA configuration extension, and MEP Configuration
 extension.

Kumar, et al. Standards Track [Page 46] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

7.2.1. MD Configuration Extension

 MD level configuration parameters are management information that can
 be inherited in the MPLS-TP OAM model and set by the connection-
 oriented OAM base model as default values.  For example, domain name
 can be set to area-ID or the provider's Autonomous System Number
 (ASN) [RFC6370] in the MPLS-TP OAM case.  In addition, at the
 Maintenance Domain Level (i.e., at root level), the domain data node
 can be augmented with technology type and technology subtype.
 Note that MD level configuration parameters provide context
 information for the management system to correlate faults, defects,
 and network failures with location information; this helps quickly
 identify root causes of network failures

7.2.1.1. Technology Type Extension

 No MPLS-TP technology type has been defined in the connection-
 oriented base model, hence it is required in the MPLS-TP OAM model.
 The technology type "mpls-tp" is defined as an identity that augments
 the base "technology-types" defined in the connection-oriented base
 model:
     identity mpls-tp{
           base co-oam:technology-types;
           description
            "mpls-tp type";
          }

7.2.1.2. Technology Subtype Extension

 In MPLS-TP, since different encapsulation types such as IP/UDP
 encapsulation and PW-ACH encapsulation can be employed, the
 "technology-sub-type" data node is defined and added into the MPLS-TP
 OAM model to further identify the encapsulation types within the
 MPLS-TP OAM model.  Based on it, we also define a technology subtype
 for IP/UDP encapsulation and PW-ACH encapsulation.  Other
 encapsulation types can be defined in the same way.  The snippet
 below depicts an example of several encapsulation types.

Kumar, et al. Standards Track [Page 47] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

 identity technology-sub-type {
       description
       "Certain implementations can have different
        encapsulation types such as IP/UDP, PW-ACH, and so on.
        Instead of defining separate models for each
        encapsulation, we define a technology subtype to
        further identify different encapsulations.
        Technology subtype is associated at the MA level."; }
            identity technology-sub-type-udp {
              base technology-sub-type;
              description
                "Technology subtype is IP/UDP encapsulation.";
            }
            identity technology-sub-type-ach {
              base technology-sub-type;
              description
                "Technology subtype is PW-ACH encapsulation.";
            }
            }
       augment "/co-oam:domains/co-oam:domain"
             + "/co-oam:mas/co-oam:ma" {
              leaf technology-sub-type {
                type identityref {
                  base technology-sub-type;
                }
              }
            }

7.2.2. MA Configuration Extension

 MA level configuration parameters are management information that can
 be inherited in the MPLS-TP OAM model and set by the connection-
 oriented OAM base model as default values.  Examples of MA Name are
 MPLS-TP LSP MEG_ID, MEG Section ID, or MEG PW ID [RFC6370].
 Note that MA level configuration parameters provide context
 information for the management system to correlate faults, defects,
 and network failures with location information; this helps quickly
 identify root causes of network failures.

7.2.3. MEP Configuration Extension

 In MPLS-TP, MEP-ID is either a variable-length label value in case of
 G-ACH encapsulation or a 2-octet unsigned integer value in case of
 IP/UDP encapsulation.  One example of MEP-ID is MPLS-TP LSP_MEP_ID

Kumar, et al. Standards Track [Page 48] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

 [RFC6370].  In the connection-oriented base model, MEP-ID is defined
 as a choice/case node that can support an int32 value, and the same
 definition can be used for MPLS-TP with no further modification.  In
 addition, at the Maintenance association End Point (MEP) level (i.e.,
 at the third level), the MEP data node can be augmented with a
 session extension and interface extension.

8. Security Considerations

 The YANG module specified in this document defines a schema for data
 that is designed to be accessed via network management protocols such
 as NETCONF [RFC6241] or RESTCONF [RFC8040].  The lowest NETCONF layer
 is the secure transport layer, and the mandatory-to-implement secure
 transport is Secure Shell (SSH) [RFC6242].  The lowest RESTCONF layer
 is HTTPS, and the mandatory-to-implement secure transport is TLS
 [RFC8446].
 The Network Configuration Access Control Model [RFC8341] provides the
 means to restrict access for particular NETCONF or RESTCONF users to
 a preconfigured subset of all available NETCONF or RESTCONF protocol
 operations and content.
 There are a number of data nodes defined in the YANG module that are
 writable/creatable/deletable (i.e., config true, which is the
 default).  These data nodes may be considered sensitive 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.  These are the subtrees and data nodes and their
 sensitivity/vulnerability:
 /co-oam:domains/co-oam:domain/
 /co-oam:domains/co-oam:domain/co-oam:mas/co-oam:ma
 /co-oam:domains/co-oam:domain/co-oam:mas/co-oam:ma/co-oam:mep
 /co-oam:domains/co-oam:domain/co-oam:mas/co-oam:ma/co-oam:mep/
 co-oam:session
 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.

Kumar, et al. Standards Track [Page 49] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

9. IANA Considerations

 This document registers a URI in the "IETF XML Registry" [RFC3688].
 The following registration has been made:
   URI: urn:ietf:params:xml:ns:yang:ietf-connection-oriented-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-connection-oriented-oam
namespace:    urn:ietf:params:xml:ns:yang:ietf-connection-oriented-oam
prefix:       co-oam
reference:    RFC 8531

10. References

10.1. Normative References

 [IEEE802.1Q]
            IEEE, "IEEE Standard for Local and Metropolitan Area
            Networks-Bridges and Bridged Networks", IEEE Std 802.1Q.
 [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
            Requirement Levels", BCP 14, RFC 2119,
            DOI 10.17487/RFC2119, March 1997,
            <https://www.rfc-editor.org/info/rfc2119>.
 [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
            DOI 10.17487/RFC3688, January 2004,
            <https://www.rfc-editor.org/info/rfc3688>.
 [RFC6020]  Bjorklund, M., Ed., "YANG - A Data Modeling Language for
            the Network Configuration Protocol (NETCONF)", RFC 6020,
            DOI 10.17487/RFC6020, October 2010,
            <https://www.rfc-editor.org/info/rfc6020>.
 [RFC6241]  Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
            and A. Bierman, Ed., "Network Configuration Protocol
            (NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011,
            <https://www.rfc-editor.org/info/rfc6241>.
 [RFC6242]  Wasserman, M., "Using the NETCONF Protocol over Secure
            Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011,
            <https://www.rfc-editor.org/info/rfc6242>.

Kumar, et al. Standards Track [Page 50] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

 [RFC6370]  Bocci, M., Swallow, G., and E. Gray, "MPLS Transport
            Profile (MPLS-TP) Identifiers", RFC 6370,
            DOI 10.17487/RFC6370, September 2011,
            <https://www.rfc-editor.org/info/rfc6370>.
 [RFC6991]  Schoenwaelder, J., Ed., "Common YANG Data Types",
            RFC 6991, DOI 10.17487/RFC6991, July 2013,
            <https://www.rfc-editor.org/info/rfc6991>.
 [RFC8040]  Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
            Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017,
            <https://www.rfc-editor.org/info/rfc8040>.
 [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
            2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
            May 2017, <https://www.rfc-editor.org/info/rfc8174>.
 [RFC8341]  Bierman, A. and M. Bjorklund, "Network Configuration
            Access Control Model", STD 91, RFC 8341,
            DOI 10.17487/RFC8341, March 2018,
            <https://www.rfc-editor.org/info/rfc8341>.
 [RFC8343]  Bjorklund, M., "A YANG Data Model for Interface
            Management", RFC 8343, DOI 10.17487/RFC8343, March 2018,
            <https://www.rfc-editor.org/info/rfc8343>.
 [RFC8446]  Rescorla, E., "The Transport Layer Security (TLS) Protocol
            Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018,
            <https://www.rfc-editor.org/info/rfc8446>.

10.2. Informative References

 [G.800]    "Unified functional architecture of transport networks",
            ITU-T Recommendation G.800, 2016.
 [G.8013]   "OAM functions and mechanisms for Ethernet based
            networks", ITU-T Recommendation G.8013/Y.1731, 2013.
 [MEF-17]   MEF Forum, "Service OAM Requirements & Framework - Phase
            1", MEF 17, April 2007.
 [MPLS-TP-OAM-YANG]
            Zhang, L., Zheng, L., Aldrin, S., and G. Mirsky, "YANG
            Data Model for MPLS-TP Operations, Administration, and
            Maintenance (OAM)", Work in Progress, draft-zhang-mpls-tp-
            yang-oam-05, October 2017.

Kumar, et al. Standards Track [Page 51] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

 [RFC6291]  Andersson, L., van Helvoort, H., Bonica, R., Romascanu,
            D., and S. Mansfield, "Guidelines for the Use of the "OAM"
            Acronym in the IETF", BCP 161, RFC 6291,
            DOI 10.17487/RFC6291, June 2011,
            <https://www.rfc-editor.org/info/rfc6291>.
 [RFC6325]  Perlman, R., Eastlake 3rd, D., Dutt, D., Gai, S., and A.
            Ghanwani, "Routing Bridges (RBridges): Base Protocol
            Specification", RFC 6325, DOI 10.17487/RFC6325, July 2011,
            <https://www.rfc-editor.org/info/rfc6325>.
 [RFC6371]  Busi, I., Ed. and D. Allan, Ed., "Operations,
            Administration, and Maintenance Framework for MPLS-Based
            Transport Networks", RFC 6371, DOI 10.17487/RFC6371,
            September 2011, <https://www.rfc-editor.org/info/rfc6371>.
 [RFC6905]  Senevirathne, T., Bond, D., Aldrin, S., Li, Y., and R.
            Watve, "Requirements for Operations, Administration, and
            Maintenance (OAM) in Transparent Interconnection of Lots
            of Links (TRILL)", RFC 6905, DOI 10.17487/RFC6905, March
            2013, <https://www.rfc-editor.org/info/rfc6905>.
 [RFC7174]  Salam, S., Senevirathne, T., Aldrin, S., and D. Eastlake
            3rd, "Transparent Interconnection of Lots of Links (TRILL)
            Operations, Administration, and Maintenance (OAM)
            Framework", RFC 7174, DOI 10.17487/RFC7174, May 2014,
            <https://www.rfc-editor.org/info/rfc7174>.
 [RFC7276]  Mizrahi, T., Sprecher, N., Bellagamba, E., and Y.
            Weingarten, "An Overview of Operations, Administration,
            and Maintenance (OAM) Tools", RFC 7276,
            DOI 10.17487/RFC7276, June 2014,
            <https://www.rfc-editor.org/info/rfc7276>.
 [RFC7455]  Senevirathne, T., Finn, N., Salam, S., Kumar, D., Eastlake
            3rd, D., Aldrin, S., and Y. Li, "Transparent
            Interconnection of Lots of Links (TRILL): Fault
            Management", RFC 7455, DOI 10.17487/RFC7455, March 2015,
            <https://www.rfc-editor.org/info/rfc7455>.
 [RFC8340]  Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams",
            BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018,
            <https://www.rfc-editor.org/info/rfc8340>.
 [RFC8342]  Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K.,
            and R. Wilton, "Network Management Datastore Architecture
            (NMDA)", RFC 8342, DOI 10.17487/RFC8342, March 2018,
            <https://www.rfc-editor.org/info/rfc8342>.

Kumar, et al. Standards Track [Page 52] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

 [RFC8532]  Kumar, D., Wang, M., Wu, Q., Ed., Rahman, R., and
            S. Raghavan, "Generic YANG Data Model for the Management
            of Operations, Administration, and Maintenance (OAM)
            Protocols That Use Connectionless Communications",
            RFC 8532, DOI 10.17487/RFC8532, April 2019,
            <https://www.rfc-editor.org/info/rfc8532>.
 [TRILL-YANG]
            Weiguo, H., Yizhou, L., Kumar, D., Durrani, M., Zhai, H.,
            and L. Xia, "TRILL YANG Data Model", Work in Progress,
            draft-ietf-trill-yang-04, December 2015.
 [TRILL-YANG-OAM]
            Kumar, D., Senevirathne, T., Finn, N., Salam, S., Xia, L.,
            and H. Weiguo, "YANG Data Model for TRILL Operations,
            Administration, and Maintenance (OAM)", Work in Progress,
            draft-ietf-trill-yang-oam-05, March 2017.

Acknowledgments

 Giles Heron came up with the idea of developing a YANG data model as
 a way of creating a unified OAM API set (interface); this document
 was largely inspired by that.  Alexander Clemm provided many valuable
 tips, comments, and remarks that helped to refine the YANG data model
 presented in this document.
 Carlos Pignataro, David Ball, Mahesh Jethanandani, Benoit Claise,
 Ladislav Lhotka, Jens Guballa, Yuji Tochio, Gregory Mirsky, Huub van
 Helvoort, Tom Taylor, Dapeng Liu, Mishael Wexler, and Adi Molkho
 contributed to and participated in the development of this document.

Contributors

 Tissa Senevirathne
 Consultant
 Email: tsenevir@gmail.com
 Norman Finn
 CISCO Systems
 510 McCarthy Blvd
 Milpitas, CA  95035
 United States of America
 Email: nfinn@cisco.com

Kumar, et al. Standards Track [Page 53] RFC 8531 Connection-Oriented OAM YANG Data Model April 2019

 Samer Salam
 CISCO Systems
 595 Burrard St. Suite 2123
 Vancouver, BC  V7X 1J1
 Canada
 Email: ssalam@cisco.com

Authors' Addresses

 Deepak Kumar
 CISCO Systems
 510 McCarthy Blvd
 Milpitas, CA  95035
 United States of America
 Email: dekumar@cisco.com
 Qin Wu
 Huawei
 101 Software Avenue, Yuhua District
 Nanjing, Jiangsu  210012
 China
 Email: bill.wu@huawei.com
 Michael Wang
 Huawei Technologies, Co., Ltd
 101 Software Avenue, Yuhua District
 Nanjing  210012
 China
 Email: wangzitao@huawei.com

Kumar, et al. Standards Track [Page 54]

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