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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


    Retrieval Methods YANG Data Model for Connectionless Operations,
             Administration, and Maintenance(OAM) protocols
           draft-ietf-lime-yang-connectionless-oam-methods-01

Abstract

   This document presents a retrieval method YANG Data model for
   connectionless OAM protocols.  It provides a technology-independent
   RPC commands for connectionless OAM protocols.  The retrieval methods
   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 levels through a unified interface) and interactive OAM
   workflows ( i.e., performing OAM functions at same levels through a
   unified interface).

Status of This Memo

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

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








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Copyright Notice

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

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (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 . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Tree Diagrams . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Overview of the Connectionless OAM retrieval methods Model  .   4
     3.1.  RPC definitions . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  OAM Retrieval Methods Hierarchy . . . . . . . . . . . . .   8
   4.  OAM Retrieval Methods YANG Module . . . . . . . . . . . . . .  19
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  34
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  34
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  34
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  35
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  36
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  36

1.  Introduction

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

   1.  Monitor reachability of destinations (Reachability Verification,
       Continuity Check).

   2.  Troubleshoot failures (Fault verification and localization).

   3.  Monitor Performance

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

   Ping and Traceroute [RFC792], [RFC4443] and BFD [RFC5880] are well-
   known fault verification and isolation tools, respectively, for IP



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   networks.  Over the years, different technologies have developed
   similar tools for similar purposes.

   In this document, we present a retrieval method YANG Data model for
   connectionless OAM protocols.  This module provides technology-
   independent RPC commands for connectionless OAM protocols.  It is
   separated from the generic YANG model for connectionless OAM
   [I-D.ietf-lime-yang-connectionless-oam] and can avoid mixing the
   models for the retrieved-data from the retrieval procedures.  It is
   expected that retrieval procedures would evolve faster than the data
   model [I-D.ietf-lime-yang-connectionless-oam] and will allow new
   procedures to be defined for retrieval of the same data defined by
   the base data 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

   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



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   RPC - A Remote Procedure Call, as used within the NETCONF protocol

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>.

   <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 retrieval methods Model

   In this document, we present a retrieval method YANG Data model for
   connectionless OAM protocols.  This module provides technology-
   independent retrieval procedures (RPC commands) for connectionless
   OAM protocols.  It provides a flexible way to retrieve the retrieved-
   data which defined by the "ietf-connectionless-oam.yang"
   [I-D.ietf-lime-yang-connectionless-oam].





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3.1.  RPC definitions

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

   Under 'connectionless-oam-methods' module, we summarize the common
   OAM functions and define the generic RPC commands: 'continuity-check'
   and 'path-discovery'.  In practice, these commands are supported by
   corresponding technology-specific OAM tools [RFC7276].  For example,
   for the IP OAM model, the continuity-check RPC corresponds to the IP
   Ping [RFC792] [RFC4443], while the path-discovery RPC command
   corresponds to IP Traceroute [RFC792] [RFC4443].

   Note that the RPC command presented in this document is the base
   building block, which is used to derive a model for a technology-
   specific OAM (i.e., ICMP ping [RFC792] [RFC4443], LSP ping
   [RFC4379]), the base building block should be extended with
   corresponding technology specific parameters.  To facilitate this and
   for future enhancements to data retrieval methods, the RPCs are
   captured under a separate module.

   The generic 'path-discovery-data' and 'continuity-check-data' are
   used as data outputs from the different RPCs described in the
   document.  Similar methods including other RPCs can retrieve the data
   using the same data model.

   The persistent method RPCs are commands to trigger persistent
   continuity check or path discovery OAM while specifying the options
   for data-export from the device.  Internet Protocol Flow Information
   Export (IPFIX) [RFC7011] or yang-push [I-D.ietf-netconf-yang-push].
   are currently outlined here as data export options and more can be
   added in future.  It should be noted that the persistent methods are
   used to trigger create, modify and delete the persistent state
   associated with the data export options.  The data export specific
   configurations are beyond the scope of this document.

       rpc continuity-check {
         if-feature coam:continuity-check;
         description
           "Generates continuity-check as per RFC7276.";
         input {
           container destination-tp {
             uses coam:tp-address;
                     description
                     "destination test point.";
           }
           uses coam:session-type;



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           leaf source-interface {
             type if:interface-ref;
                     description
                     "source interface.";
           }
           leaf outbound-interface {
             type if:interface-ref;

                     description
                     "outbound interface.";
           }
           leaf count {
             type uint32;
             default "5";
             description
               "Specifies the number of packets that will be sent.";
           }
           leaf vrf {
             type coam:routing-instance-ref;
             description
               "vrf instance.";
           }
           leaf ttl {
             type uint8;
             default "255";
             description
               "Time to live (TTL).";
           }
           leaf packet-size {
             type uint32 {
               range "64..10000";
             }
             default "64";
             description
               "Size of ping echo request packets, in octets";
           }
         }
         output {
           list error-code-list {
             key "response-index";
             leaf response-index {
               type uint32;
                       description
                       "response index.";
             }
             leaf status-code {
               type int32;
               description



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                 "error code is ";
             }
             leaf status-sub-code {
               type uint8;
                       description
                       "sub code.";
             }
                     description
                     "error code list.";
           }

           uses coam:continuity-check-data;
         }
       }

       rpc path-discovery {
         description
           "Generates path discovery as per RFC7276.";
         input {
           container destination-tp {
             uses coam:tp-address;
                     description
                     "destination test point.";
           }
           uses coam:session-type;
           leaf source-interface {
             type if:interface-ref;
             description
               "source interface.";
           }
           leaf outbound-interface {
             type if:interface-ref;
             description
               "outbound interface.";
           }
           leaf vrf {
             type coam:routing-instance-ref;
             description
               "vrf";
           }
           leaf max-ttl {
             type uint8;
             default "255";
             description
               "max ttl.";
           }
         }
         output {



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           list response-list {
             key "response-index";
             description
               "path discovery response list.";
             leaf response-index {
               type uint32;
               description
                 "response index.";
             }
             leaf status-code {
               type int32;
               description
                 "error code is ";
             }
             leaf status-sub-code {
               type uint8;

                       description
                       "sub code is ";
             }
           }

           uses coam:path-discovery-data;
          }
       }

              Snippet of data hierarchy related to RPC calls

3.2.  OAM Retrieval Methods Hierarchy

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

module: ietf-connectionless-oam-methods

  rpcs:
    +---x continuity-check {coam:continuity-check}?
    |  +---w input
    |  |  +---w destination-tp
    |  |  |  +---w tp-location-type-value?   identityref
    |  |  |  +---w (tp-address)?
    |  |  |     +--:(mac-address)
    |  |  |     |  +---w mac-address?              yang:mac-address
    |  |  |     +--:(ipv4-address)
    |  |  |     |  +---w ipv4-address?             inet:ipv4-address
    |  |  |     +--:(ipv6-address)
    |  |  |     |  +---w ipv6-address?             inet:ipv6-address
    |  |  |     +--:(tp-attribute)



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    |  |  |     |  +---w tp-attribute-type?        fec-type
    |  |  |     |  +---w (tp-attribute-value)?
    |  |  |     |     +--:(ip-prefix)
    |  |  |     |     |  +---w ip-prefix?          inet:ip-prefix
    |  |  |     |     +--:(bgp)
    |  |  |     |     |  +---w bgp                 inet:ip-prefix
    |  |  |     |     +--:(tunnel)
    |  |  |     |     |  +---w tunnel-interface?         uint32
    |  |  |     |     +--:(pw)
    |  |  |     |     |  +---w remote-pe-address?  inet:ip-address
    |  |  |     |     |  +---w pw-id?                    uint32
    |  |  |     |     +--:(vpls)
    |  |  |     |     |  +---w route-distinguisher?      uint32
    |  |  |     |     |  +---w sender-ve-id?             uint32
    |  |  |     |     |  +---w receiver-ve-id?           uint32
    |  |  |     |     +--:(mpls-mldp)
    |  |  |     |        +---w (root-address)?
    |  |  |     |           +--:(ip-address)
    |  |  |     |           |  +---w source-address?   inet:ip-address
    |  |  |     |           |  +---w group-ip-address? IP-Multicast
        -Group-Address
    |  |  |     |           +--:(vpn)
    |  |  |     |           |  +---w as-number         inet:as-number
    |  |  |     |           +--:(global-id)
    |  |  |     |              +---w lsp-id?                   string
    |  |  |     +--:(system-info)
    |  |  |        +---w system-id?                router-id
    |  |  +---w session-type-enum?    enumeration
    |  |  +---w source-interface?     if:interface-ref
    |  |  +---w outbound-interface?   if:interface-ref
    |  |  +---w count?                uint32
    |  |  +---w vrf?                  coam:routing-instance-ref
    |  |  +---w ttl?                  uint8
    |  |  +---w packet-size?          uint32
    |  +--ro output
    |     +--ro error-code-list* [response-index]
    |     |  +--ro response-index     uint32
    |     |  +--ro status-code?       int32
    |     |  +--ro status-sub-code?   uint8
    |     +--ro src-test-point
    |     |  +--ro vrf?                      routing-instance-ref
    |     |  +--ro tp-location-type-value?   identityref
    |     |  +--ro (tp-address)?
    |     |  |  +--:(mac-address)
    |     |  |  |  +--ro mac-address?              yang:mac-address
    |     |  |  +--:(ipv4-address)
    |     |  |  |  +--ro ipv4-address?             inet:ipv4-address
    |     |  |  +--:(ipv6-address)



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    |     |  |  |  +--ro ipv6-address?             inet:ipv6-address
    |     |  |  +--:(tp-attribute)
    |     |  |  |  +--ro tp-attribute-type?        fec-type
    |     |  |  |  +--ro (tp-attribute-value)?
    |     |  |  |     +--:(ip-prefix)
    |     |  |  |     |  +--ro ip-prefix?          inet:ip-prefix
    |     |  |  |     +--:(bgp)
    |     |  |  |     |  +--ro bgp?                inet:ip-prefix
    |     |  |  |     +--:(tunnel)
    |     |  |  |     |  +--ro tunnel-interface?         uint32
    |     |  |  |     +--:(pw)
    |     |  |  |     |  +--ro remote-pe-address?  inet:ip-address
    |     |  |  |     |  +--ro pw-id?                    uint32
    |     |  |  |     +--:(vpls)
    |     |  |  |     |  +--ro route-distinguisher?      uint32
    |     |  |  |     |  +--ro sender-ve-id?             uint32
    |     |  |  |     |  +--ro receiver-ve-id?           uint32
    |     |  |  |     +--:(mpls-mldp)
    |     |  |  |        +--ro (root-address)?
    |     |  |  |           +--:(ip-address)
    |     |  |  |           |  +--ro source-address?  inet:ip-address
    |     |  |  |           |  +--ro group-ip-address? IP-Multicast
        -Group-Address
    |     |  |  |           +--:(vpn)
    |     |  |  |           |  +--ro as-number?        inet:as-number
    |     |  |  |           +--:(global-id)
    |     |  |  |              +--ro lsp-id?           string
    |     |  |  +--:(system-info)
    |     |  |     +--ro system-id?                router-id
    |     |  +--ro egress-intf-name?         if:interface-ref
    |     +--ro dest-test-point
    |     |  +--ro vrf?                      routing-instance-ref
    |     |  +--ro tp-location-type-value?   identityref
    |     |  +--ro (tp-address)?
    |     |  |  +--:(mac-address)
    |     |  |  |  +--ro mac-address?              yang:mac-address
    |     |  |  +--:(ipv4-address)
    |     |  |  |  +--ro ipv4-address?             inet:ipv4-address
    |     |  |  +--:(ipv6-address)
    |     |  |  |  +--ro ipv6-address?             inet:ipv6-address
    |     |  |  +--:(tp-attribute)
    |     |  |  |  +--ro tp-attribute-type?        fec-type
    |     |  |  |  +--ro (tp-attribute-value)?
    |     |  |  |     +--:(ip-prefix)
    |     |  |  |     |  +--ro ip-prefix           inet:ip-prefix
    |     |  |  |     +--:(bgp)
    |     |  |  |     |  +--ro bgp?                inet:ip-prefix
    |     |  |  |     +--:(tunnel)



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    |     |  |  |     |  +--ro tunnel-interface?         uint32
    |     |  |  |     +--:(pw)
    |     |  |  |     |  +--ro remote-pe-address?  inet:ip-address
    |     |  |  |     |  +--ro pw-id?                    uint32
    |     |  |  |     +--:(vpls)
    |     |  |  |     |  +--ro route-distinguisher?      uint32
    |     |  |  |     |  +--ro sender-ve-id?             uint32
    |     |  |  |     |  +--ro receiver-ve-id?           uint32
    |     |  |  |     +--:(mpls-mldp)
    |     |  |  |        +--ro (root-address)?
    |     |  |  |           +--:(ip-address)
    |     |  |  |           |  +--ro source-address?  inet:ip-address
    |     |  |  |           |  +--ro group-ip-address? IP-Multicast-
        Group-Address
    |     |  |  |           +--:(vpn)
    |     |  |  |           |  +--ro as-number?       inet:as-number
    |     |  |  |           +--:(global-id)
    |     |  |  |              +--ro lsp-id?          string
    |     |  |  +--:(system-info)
    |     |  |     +--ro system-id?                router-id
    |     |  +--ro ingress-intf-name?        if:interface-ref
    |     +--ro sequence-number?             uint64
    |     +--ro hop-cnt?                     uint8
    |     +--ro session-packet-statistics
    |     |  +--ro rx-packet-count?    uint32
    |     |  +--ro tx-packet-count?    uint32
    |     |  +--ro rx-bad-packet?      uint32
    |     |  +--ro tx-packet-failed?   uint32
    |     +--ro session-error-statistics
    |     |  +--ro packet-drops-count?         uint32
    |     |  +--ro packet-reorder-count?       uint32
    |     |  +--ro packets-out-of-seq-count?   uint32
    |     |  +--ro packets-dup-count?          uint32
    |     +--ro session-delay-statistics
    |     |  +--ro time-resolution-value?   identityref
    |     |  +--ro min-delay-value?         uint32
    |     |  +--ro max-delay-value?         uint32
    |     |  +--ro average-delay-value?     uint32
    |     +--ro session-jitter-statistics
    |        +--ro time-resolution-value?   identityref
    |        +--ro min-jitter-value?        uint32
    |        +--ro max-jitter-value?        uint32
    |        +--ro average-jitter-value?    uint32
    +---x cc-persistent-create {coam:continuity-check}?
    |  +---w input
    |  |  +---w destination-tp
    |  |  |  +---w tp-location-type-value?   identityref
    |  |  |  +---w (tp-address)?



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    |  |  |     +--:(mac-address)
    |  |  |     |  +---w mac-address?              yang:mac-address
    |  |  |     +--:(ipv4-address)
    |  |  |     |  +---w ipv4-address?             inet:ipv4-address
    |  |  |     +--:(ipv6-address)
    |  |  |     |  +---w ipv6-address?             inet:ipv6-address
    |  |  |     +--:(tp-attribute)
    |  |  |     |  +---w tp-attribute-type?        fec-type
    |  |  |     |  +---w (tp-attribute-value)?
    |  |  |     |     +--:(ip-prefix)
    |  |  |     |     |  +---w ip-prefix?                inet:ip-prefix
    |  |  |     |     +--:(bgp)
    |  |  |     |     |  +---w bgp?                      inet:ip-prefix
    |  |  |     |     +--:(tunnel)
    |  |  |     |     |  +---w tunnel-interface?         uint32
    |  |  |     |     +--:(pw)
    |  |  |     |     |  +---w remote-pe-address?        inet:ip-address
    |  |  |     |     |  +---w pw-id?                    uint32
    |  |  |     |     +--:(vpls)
    |  |  |     |     |  +---w route-distinguisher?      uint32
    |  |  |     |     |  +---w sender-ve-id?             uint32
    |  |  |     |     |  +---w receiver-ve-id?           uint32
    |  |  |     |     +--:(mpls-mldp)
    |  |  |     |        +---w (root-address)?
    |  |  |     |           +--:(ip-address)
    |  |  |     |           |  +---w source-address?     inet:ip-address
    |  |  |     |           |  +---w group-ip-address?   IP-Multicast-
        Group-Address
    |  |  |     |           +--:(vpn)
    |  |  |     |           |  +---w as-number?         inet:as-number
    |  |  |     |           +--:(global-id)
    |  |  |     |              +---w lsp-id?                   string
    |  |  |     +--:(system-info)
    |  |  |        +---w system-id?                router-id
    |  |  +---w session-type-enum?    enumeration
    |  |  +---w source-interface?     if:interface-ref
    |  |  +---w outbound-interface?   if:interface-ref
    |  |  +---w vrf?                  coam:routing-instance-ref
    |  |  +---w ttl?                  uint8
    |  |  +---w data-export-method?   export-method
    |  |  +---w (cc-trigger)?
    |  |     +--:(periodic)
    |  |     |  +---w period?               yang:timeticks
    |  |     |  +---w start-time?           yang:date-and-time
    |  |     +--:(on-change)
    |  |        +---w all-data-on-start?    boolean
    |  |        +---w excluded-change*      change-type
    |  +--ro output



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    |     +--ro error-code-list* [response-index]
    |     |  +--ro response-index     uint32
    |     |  +--ro status-code?       int32
    |     |  +--ro status-sub-code?   uint8
    |     +--ro cc-persistent-id?    string
    +---x cc-persistent-modify {coam:continuity-check}?
    |  +---w input
    |  |  +---w cc-persistent-id?       string
    |  |  +---w data-export-method?   export-method
    |  |  +---w (cc-trigger)?
    |  |     +--:(periodic)
    |  |     |  +---w period?               yang:timeticks
    |  |     |  +---w start-time?           yang:date-and-time
    |  |     +--:(on-change)
    |  |        +---w all-data-on-start?    boolean
    |  |        +---w excluded-change*      change-type
    |  +--ro output
    |     +--ro error-code-list* [response-index]
    |     |  +--ro response-index     uint32
    |     |  +--ro status-code?       int32
    |     |  +--ro status-sub-code?   uint8
    |     +--ro cc-persistent-id?    string
    +---x cc-persistent-delete {coam:continuity-check}?
    |  +---w input
    |  |  +---w cc-persistent-id?   string
    |  +--ro output
    |     +--ro error-code-list* [response-index]
    |        +--ro response-index     uint32
    |        +--ro status-code?       int32
    |        +--ro status-sub-code?   uint8
    +---x path-discovery
    |  +---w input
    |  |  +---w destination-tp
    |  |  |  +---w tp-location-type-value?   identityref
    |  |  |  +---w (tp-address)?
    |  |  |     +--:(mac-address)
    |  |  |     |  +---w mac-address?              yang:mac-address
    |  |  |     +--:(ipv4-address)
    |  |  |     |  +---w ipv4-address?             inet:ipv4-address
    |  |  |     +--:(ipv6-address)
    |  |  |     |  +---w ipv6-address?             inet:ipv6-address
    |  |  |     +--:(tp-attribute)
    |  |  |     |  +---w tp-attribute-type?        fec-type
    |  |  |     |  +---w (tp-attribute-value)?
    |  |  |     |     +--:(ip-prefix)
    |  |  |     |     |  +---w ip-prefix?          inet:ip-prefix
    |  |  |     |     +--:(bgp)
    |  |  |     |     |  +---w bgp                 inet:ip-prefix



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    |  |  |     |     +--:(tunnel)
    |  |  |     |     |  +---w tunnel-interface?   uint32
    |  |  |     |     +--:(pw)
    |  |  |     |     |  +---w remote-pe-address?  inet:ip-address
    |  |  |     |     |  +---w pw-id?                    uint32
    |  |  |     |     +--:(vpls)
    |  |  |     |     |  +---w route-distinguisher?      uint32
    |  |  |     |     |  +---w sender-ve-id?             uint32
    |  |  |     |     |  +---w receiver-ve-id?           uint32
    |  |  |     |     +--:(mpls-mldp)
    |  |  |     |        +---w (root-address)?
    |  |  |     |           +--:(ip-address)
    |  |  |     |           |  +---w source-address? inet:ip-address
    |  |  |     |           |  +---w group-ip-address? IP-Multicast
        -Group-Address
    |  |  |     |           +--:(vpn)
    |  |  |     |           |  +---w as-number?        inet:as-number
    |  |  |     |           +--:(global-id)
    |  |  |     |              +---w lsp-id?                   string
    |  |  |     +--:(system-info)
    |  |  |        +---w system-id?                router-id
    |  |  +---w session-type-enum?    enumeration
    |  |  +---w source-interface?     if:interface-ref
    |  |  +---w outbound-interface?   if:interface-ref
    |  |  +---w vrf?                  coam:routing-instance-ref
    |  |  +---w max-ttl?              uint8
    |  +--ro output
    |     +--ro response-list* [response-index]
    |     |  +--ro response-index     uint32
    |     |  +--ro status-code?       int32
    |     |  +--ro status-sub-code?   uint8
    |     +--ro src-test-point
    |     |  +--ro vrf?                      routing-instance-ref
    |     |  +--ro tp-location-type-value?   identityref
    |     |  +--ro (tp-address)?
    |     |     +--:(mac-address)
    |     |     |  +--ro mac-address?              yang:mac-address
    |     |     +--:(ipv4-address)
    |     |     |  +--ro ipv4-address?             inet:ipv4-address
    |     |     +--:(ipv6-address)
    |     |     |  +--ro ipv6-address?             inet:ipv6-address
    |     |     +--:(tp-attribute)
    |     |     |  +--ro tp-attribute-type?        fec-type
    |     |     |  +--ro (tp-attribute-value)?
    |     |     |     +--:(ip-prefix)
    |     |     |     |  +--ro ip-prefix?          inet:ip-prefix
    |     |     |     +--:(bgp)
    |     |     |     |  +--ro bgp?                inet:ip-prefix



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    |     |     |     +--:(tunnel)
    |     |     |     |  +--ro tunnel-interface?         uint32
    |     |     |     +--:(pw)
    |     |     |     |  +--ro remote-pe-address?  inet:ip-address
    |     |     |     |  +--ro pw-id?                    uint32
    |     |     |     +--:(vpls)
    |     |     |     |  +--ro route-distinguisher?      uint32
    |     |     |     |  +--ro sender-ve-id?             uint32
    |     |     |     |  +--ro receiver-ve-id?           uint32
    |     |     |     +--:(mpls-mldp)
    |     |     |        +--ro (root-address)?
    |     |     |           +--:(ip-address)
    |     |     |           |  +--ro source-address? inet:ip-address
    |     |     |           |  +--ro group-ip-address? IP-Multicast
        -Group-Address
    |     |     |           +--:(vpn)
    |     |     |           |  +--ro as-number?        inet:as-number
    |     |     |           +--:(global-id)
    |     |     |              +--ro lsp-id?           string
    |     |     +--:(system-info)
    |     |        +--ro system-id?                router-id
    |     +--ro dest-test-point
    |     |  +--ro vrf?                      routing-instance-ref
    |     |  +--ro tp-location-type-value?   identityref
    |     |  +--ro (tp-address)?
    |     |     +--:(mac-address)
    |     |     |  +--ro mac-address?              yang:mac-address
    |     |     +--:(ipv4-address)
    |     |     |  +--ro ipv4-address?             inet:ipv4-address
    |     |     +--:(ipv6-address)
    |     |     |  +--ro ipv6-address?             inet:ipv6-address
    |     |     +--:(tp-attribute)
    |     |     |  +--ro tp-attribute-type?        fec-type
    |     |     |  +--ro (tp-attribute-value)?
    |     |     |     +--:(ip-prefix)
    |     |     |     |  +--ro ip-prefix           inet:ip-prefix
    |     |     |     +--:(bgp)
    |     |     |     |  +--ro bgp?                inet:ip-prefix
    |     |     |     +--:(tunnel)
    |     |     |     |  +--ro tunnel-interface?         uint32
    |     |     |     +--:(pw)
    |     |     |     |  +--ro remote-pe-address?  inet:ip-address
    |     |     |     |  +--ro pw-id?                    uint32
    |     |     |     +--:(vpls)
    |     |     |     |  +--ro route-distinguisher?      uint32
    |     |     |     |  +--ro sender-ve-id?             uint32
    |     |     |     |  +--ro receiver-ve-id?           uint32
    |     |     |     +--:(mpls-mldp)



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    |     |     |        +--ro (root-address)?
    |     |     |           +--:(ip-address)
    |     |     |           |  +--ro source-address? inet:ip-address
    |     |     |           |  +--ro group-ip-address? IP-Multicast
        -Group-Address
    |     |     |           +--:(vpn)
    |     |     |           |  +--ro as-number?        inet:as-number
    |     |     |           +--:(global-id)
    |     |     |              +--ro lsp-id?                   string
    |     |     +--:(system-info)
    |     |        +--ro system-id?                router-id
    |     +--ro sequence-number?             uint64
    |     +--ro hop-cnt?                     uint8
    |     +--ro session-packet-statistics
    |     |  +--ro rx-packet-count?    uint32
    |     |  +--ro tx-packet-count?    uint32
    |     |  +--ro rx-bad-packet?      uint32
    |     |  +--ro tx-packet-failed?   uint32
    |     +--ro session-error-statistics
    |     |  +--ro packet-drops-count?         uint32
    |     |  +--ro packet-reorder-count?       uint32
    |     |  +--ro packets-out-of-seq-count?   uint32
    |     |  +--ro packets-dup-count?          uint32
    |     +--ro session-delay-statistics
    |     |  +--ro time-resolution-value?   identityref
    |     |  +--ro min-delay-value?         uint32
    |     |  +--ro max-delay-value?         uint32
    |     |  +--ro average-delay-value?     uint32
    |     +--ro session-jitter-statistics
    |     |  +--ro time-resolution-value?   identityref
    |     |  +--ro min-jitter-value?        uint32
    |     |  +--ro max-jitter-value?        uint32
    |     |  +--ro average-jitter-value?    uint32
    |     +--ro path-verification
    |     |  +--ro flow-info?                              string
    |     |  +--ro session-path-verification-statistics
    |     |     +--ro verified-count?   uint32
    |     |     +--ro failed-count?     uint32
    |     +--ro path-trace-info
    |        +--ro path-trace-info-list* [index]
    |           +--ro index                     uint32
    |           +--ro vrf?                      routing-instance-ref
    |           +--ro tp-location-type-value?   identityref
    |           +--ro (tp-address)?
    |           |  +--:(mac-address)
    |           |  |  +--ro mac-address?              yang:mac-address
    |           |  +--:(ipv4-address)
    |           |  |  +--ro ipv4-address?             inet:ipv4-address



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    |           |  +--:(ipv6-address)
    |           |  |  +--ro ipv6-address?             inet:ipv6-address
    |           |  +--:(tp-attribute)
    |           |  |  +--ro tp-attribute-type?        fec-type
    |           |  |  +--ro (tp-attribute-value)?
    |           |  |     +--:(ip-prefix)
    |           |  |     |  +--ro ip-prefix?          inet:ip-prefix
    |           |  |     +--:(bgp)
    |           |  |     |  +--ro bgp?                inet:ip-prefix
    |           |  |     +--:(tunnel)
    |           |  |     |  +--ro tunnel-interface?         uint32
    |           |  |     +--:(pw)
    |           |  |     |  +--ro remote-pe-address?  inet:ip-address
    |           |  |     |  +--ro pw-id?                    uint32
    |           |  |     +--:(vpls)
    |           |  |     |  +--ro route-distinguisher?      uint32
    |           |  |     |  +--ro sender-ve-id?             uint32
    |           |  |     |  +--ro receiver-ve-id?           uint32
    |           |  |     +--:(mpls-mldp)
    |           |  |        +--ro (root-address)?
    |           |  |           +--:(ip-address)
    |           |  |           |  +--ro source-address? inet:ip-address
    |           |  |           |  +--ro group-ip-address? IP-Multicast
        -Group-Address
    |           |  |           +--:(vpn)
    |           |  |           |  +--ro as-number?        inet:as-number
    |           |  |           +--:(global-id)
    |           |  |              +--ro lsp-id?                   string
    |           |  +--:(system-info)
    |           |     +--ro system-id?                router-id
    |           +--ro timestamp-sec?            yang:timestamp
    |           +--ro timestamp-nanosec?        yang:timestamp
    |           +--ro ingress-intf-name?        if:interface-ref
    |           +--ro egress-intf-name?         if:interface-ref
    |           +--ro queue-depth?              uint32
    |           +--ro transit-delay?            uint32
    |           +--ro app-meta-data?            uint64
    |           +--ro opaque-tlvs
    |              +--ro opaque-tlvs-list*
    |                 +--ro type?     opaque-tlv-type
    |                 +--ro length?   uint16
    |                 +--ro value?    yang:hex-string
    +---x pd-persistent-create
    |  +---w input
    |  |  +---w destination-tp
    |  |  |  +---w tp-location-type-value?   identityref
    |  |  |  +---w (tp-address)?
    |  |  |     +--:(mac-address)



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    |  |  |     |  +---w mac-address?              yang:mac-address
    |  |  |     +--:(ipv4-address)
    |  |  |     |  +---w ipv4-address?             inet:ipv4-address
    |  |  |     +--:(ipv6-address)
    |  |  |     |  +---w ipv6-address?             inet:ipv6-address
    |  |  |     +--:(tp-attribute)
    |  |  |     |  +---w tp-attribute-type?        fec-type
    |  |  |     |  +---w (tp-attribute-value)?
    |  |  |     |     +--:(ip-prefix)
    |  |  |     |     |  +---w ip-prefix?          inet:ip-prefix
    |  |  |     |     +--:(bgp)
    |  |  |     |     |  +---w bgp?                inet:ip-prefix
    |  |  |     |     +--:(tunnel)
    |  |  |     |     |  +---w tunnel-interface?         uint32
    |  |  |     |     +--:(pw)
    |  |  |     |     |  +---w remote-pe-address?  inet:ip-address
    |  |  |     |     |  +---w pw-id?                    uint32
    |  |  |     |     +--:(vpls)
    |  |  |     |     |  +---w route-distinguisher?      uint32
    |  |  |     |     |  +---w sender-ve-id?             uint32
    |  |  |     |     |  +---w receiver-ve-id?           uint32
    |  |  |     |     +--:(mpls-mldp)
    |  |  |     |        +---w (root-address)?
    |  |  |     |           +--:(ip-address)
    |  |  |     |           |  +---w source-address inet:ip-address
    |  |  |     |           |  +---w group-ip-address? IP-Multicast
        -Group-Address
    |  |  |     |           +--:(vpn)
    |  |  |     |           |  +---w as-number?      inet:as-number
    |  |  |     |           +--:(global-id)
    |  |  |     |              +---w lsp-id?                 string
    |  |  |     +--:(system-info)
    |  |  |        +---w system-id?                router-id
    |  |  +---w session-type-enum?    enumeration
    |  |  +---w source-interface?     if:interface-ref
    |  |  +---w outbound-interface?   if:interface-ref
    |  |  +---w vrf?                  coam:routing-instance-ref
    |  |  +---w max-ttl?              uint8
    |  |  +---w data-export-method?   export-method
    |  |  +---w (pd-trigger)?
    |  |     +--:(periodic)
    |  |     |  +---w period?               yang:timeticks
    |  |     |  +---w start-time?           yang:date-and-time
    |  |     +--:(on-change)
    |  |        +---w all-data-on-start?    boolean
    |  |        +---w excluded-change*      change-type
    |  +--ro output
    |     +--ro response-list* [response-index]



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    |        +--ro response-index     uint32
    |        +--ro status-code?       int32
    |        +--ro status-sub-code?   uint8
    |        +--ro pd-persistent-id?    string
    +---x pd-persistent-modify
    |  +---w input
    |  |  +---w pd-persistent-id?       string
    |  |  +---w data-export-method?   export-method
    |  |  +---w (pd-trigger)?
    |  |     +--:(periodic)
    |  |     |  +---w period?               yang:timeticks
    |  |     |  +---w start-time?           yang:date-and-time
    |  |     +--:(on-change)
    |  |        +---w all-data-on-start?    boolean
    |  |        +---w excluded-change*      change-type
    |  +--ro output
    |     +--ro response-list* [response-index]
    |        +--ro response-index     uint32
    |        +--ro status-code?       int32
    |        +--ro status-sub-code?   uint8
    |        +--ro pd-persistent-id?    string
    +---x pd-persistent-delete
       +---w input
       |  +---w pd-persistent-id?   string
       +--ro output
          +--ro response-list* [response-index]
             +--ro response-index     uint32
             +--ro status-code?       int32
             +--ro status-sub-code?   uint8


                  data hierarchy of OAM Retrieval Methods

4.  OAM Retrieval Methods YANG Module

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

module ietf-connectionless-oam-methods {
namespace "urn:ietf:params:xml:ns:yang:ietf-connectionless-oam-methods";
  prefix coam-methods;

  import ietf-interfaces {
    prefix if;
  }
  import ietf-connectionless-oam {
    prefix coam;
  }
  import ietf-yang-types {



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    prefix yang;
  }

    organization "IETF LIME Working Group";
    contact
        "Deepak Kumar dekumar@cisco.com
         Qin Wu       bill.wu@huawei.com
         S Raghavan   srihari@cisco.com
         Zitao Wang   wangzitao@huawei.com
         R Rahman     rrahman@cisco.com";

    description
      "This YANG module defines the RPCs for ,
       connectionless OAM to be used within IETF
       in a protocol Independent 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 2017-02-15 {
      description
        "02 version";
      reference
          "draft-ietf-lime-yang-connectionless-oam-methods";
    }

    rpc continuity-check {
      if-feature coam:continuity-check;
      description
        "Generates continuity-check as per RFC7276.";
      input {
        container destination-tp {
          uses coam:tp-address;
          description
            "Destination test point.";
        }
        uses coam:session-type;
        leaf source-interface {
          type if:interface-ref;
                  description
                  "Source interface.";
        }
        leaf outbound-interface {
          type if:interface-ref;

                  description
                  "Outbound interface.";



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        }
        leaf count {
          type uint32;
          default "5";
          description
            "Specifies the number of
                        packets that will be sent.";
        }
        leaf vrf {
          type coam:routing-instance-ref;
          description
            "VRF instance.";
        }

        leaf ttl {
          type uint8;
          default "255";
          description
            "Time to live (TTL).";
        }
        leaf packet-size {
          type uint32 {
            range "64..10000";
          }
          default "64";
          description
            "Size of ping echo request
                        packets, in octets";
        }
      }
      output {
        list error-code-list {
          key "response-index";
          leaf response-index {
            type uint32;
            description
              "Response index.";
          }
          leaf status-code {
            type int32;
            description
              "Error code is ";
          }
          leaf status-sub-code {
            type uint8;
            description
              "Sub code.";
          }



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          description
            "Error code list.";
        }

        uses coam:continuity-check-data;
      }
    }

    identity export-method {
      description
        "Base identity to represent a conceptual export-method.";
    }

    identity ipfix-export {
      base export-method;
      description
        "IPFIX based export. Configuration provided separately.";
    }

    identity yang-push-export {
      base export-method;
      description
          "Yang-push from draft-ietf-netconf-yang-push";
    }

    typedef export-method {
      type identityref {
        base export-method;
      }
      description
          "Export method type.";
    }

    typedef change-type {
      type enumeration {
        enum "create" {
        description
          "Change due to a create.";
        }
        enum "delete" {
        description
          "Change due to a delete.";
        }
        enum "modify" {
        description
          "Change due to an update.";
        }
      }



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      description
        "Different types of changes that may occur.";
    }

    rpc cc-persistent-create {
      if-feature coam:continuity-check;
      description
        "Generates persistent continuity-check.";
      input {
        container destination-tp {
          uses coam:tp-address;
          description
            "Destination test point.";
        }

        uses coam:session-type;

        leaf source-interface {
          type if:interface-ref;
            description
                        "Source interface.";
        }

        leaf outbound-interface {
          type if:interface-ref;
            description
                        "Outbound interface.";
        }

        leaf vrf {
          type coam:routing-instance-ref;
          description
                  "VRF instance.";
        }

        leaf ttl {
          type uint8;
          default "255";
          description
            "Time to live (TTL).";
        }

        leaf data-export-method {
          type export-method;
          description
                  "Type of export.";
        }




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        choice cc-trigger {
          description
            "Defines necessary conditions for
                        periodic or on-change trigger.";
          case periodic {
            description "Periodic reports.";
            leaf period {
              type yang:timeticks;
              description "Time interval between reports.";
            }
            leaf start-time {
              type yang:date-and-time;
              description
                          "Timestamp from which reports are started.";
            }
          }
          case on-change {
            description
                        "On-change trigger and not periodic.";
            leaf all-data-on-start {
              type boolean;
              description
                          "Full update needed on start or not.";
            }
            leaf-list excluded-change {
              type change-type;
              description
                          "Restrict which changes trigger an update.";
            }
          }
        }
      }
      output {
        list error-code-list {
          key "response-index";
          leaf response-index {
            type uint32;
            description
              "Response index.";
          }

          leaf status-code {
            type int32;
            description
              "Error code.";
          }

          leaf status-sub-code {



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            type uint8;
            description
              "Sub code.";
          }

          description
            "Error code list.";
        }
        leaf cc-persistent-id {
          type string;
          description
                  "Id to act as a cookie.";
        }
      }
    }

    rpc cc-persistent-modify {
      if-feature coam:continuity-check;
      description
        "Modifies persistent continuity-check
                as per RFC7276.";
      input {
        leaf cc-persistent-id {
          type string;
          description
                  "Cookie Id to be used for modifications.";
        }

        leaf data-export-method {
          type export-method;
          description
                  "Type of export to use.";
        }

        choice cc-trigger {
          description
            "Defines necessary conditions for
                        periodic or on-change trigger.";
          case periodic {
            description "Periodic reports.";
            leaf period {
              type yang:timeticks;
              description
                          "Time interval between reports.";
            }
            leaf start-time {
              type yang:date-and-time;
              description



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                          "Timestamp from which reports are started.";
            }
          }
          case on-change {
            description
                        "On-change trigger and not periodic.";
            leaf all-data-on-start {
              type boolean;
              description
                          "Full update needed on start or not.";
            }
            leaf-list excluded-change {
              type change-type;
              description
                          "Restrict which changes trigger an update.";
            }
          }
        }
      }
      output {
        list error-code-list {
          key "response-index";
          leaf response-index {
            type uint32;
            description
                        "Response index.";
          }

          leaf status-code {
            type int32;
            description
              "Error code";
          }

          leaf status-sub-code {
            type uint8;
            description
              "Sub code.";
          }

          description
            "Error code list.";
        }

        leaf cc-persistent-id {
          type string;
          description
                  "Id to represent a cookie.";



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        }
      }
    }

    rpc cc-persistent-delete {
      if-feature coam:continuity-check;
      description
        "Deletes persistent continuity-check as per RFC7276.";
      input {
        leaf cc-persistent-id {
          type string;
          description
                  "Cookie Id to be used in deletion.";
        }
      }
      output {
        list error-code-list {
          key "response-index";
          leaf response-index {
            type uint32;
            description
                        "Response index.";
          }

          leaf status-code {
            type int32;
            description
              "Error code.";
          }

          leaf status-sub-code {
            type uint8;
            description
                        "Sub code.";
          }

          description
            "Error code list.";
        }
      }
    }

    rpc path-discovery {
      description
        "Generates path discovery as per RFC7276.";
      input {
        container destination-tp {
          uses coam:tp-address;



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          description
          "Destination test point.";

        }
        uses coam:session-type;
        leaf source-interface {
          type if:interface-ref;
          description
            "Source interface.";
        }

        leaf outbound-interface {
          type if:interface-ref;
          description
            "Outbound interface.";
        }

        leaf vrf {
          type coam:routing-instance-ref;
          description
            "VRF";
        }

        leaf max-ttl {
          type uint8;
          default "255";
          description
            "Max ttl.";
        }
      }
      output {
        list response-list {
          key "response-index";
          description
            "Path discovery response list.";
          leaf response-index {
            type uint32;
            description
              "Response index.";
          }

          leaf status-code {
            type int32;
            description
              "Error code is ";
          }

          leaf status-sub-code {



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            type uint8;
            description
              "Sub code is ";
          }
        }

        uses coam:path-discovery-data;

       }
    }

    rpc pd-persistent-create {
      description
        "Generates persistent path discovery.";
      input {
        container destination-tp {
          uses coam:tp-address;
          description
            "Destination test point.";

        }

        uses coam:session-type;

        leaf source-interface {
          type if:interface-ref;
          description
            "Source interface.";
        }

        leaf outbound-interface {
          type if:interface-ref;
          description
            "Outbound interface.";
        }

        leaf vrf {
          type coam:routing-instance-ref;
          description
            "VRF";
        }

        leaf max-ttl {
          type uint8;
          default "255";
          description
            "Max ttl.";
        }



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        leaf data-export-method {
          type export-method;
          description
                  "Type of export.";
        }

        choice pd-trigger {
          description
            "Defines necessary conditions
                        for periodic or on-change
             trigger.";
          case periodic {
            description
                        "Periodic reports.";
            leaf period {
              type yang:timeticks;
              description
                          "Time interval between reports.";
            }
            leaf start-time {
              type yang:date-and-time;
              description
                          "Timestamp from which reports are started.";
            }
          }
          case on-change {
            description
                        "On-change trigger and not periodic.";
            leaf all-data-on-start {
              type boolean;
              description
                          "Full update needed on start or not.";
            }
            leaf-list excluded-change {
              type change-type;
              description
                          "Restrict which changes trigger an update.";
            }
          }
        }
      }
      output {
        list response-list {
          key "response-index";
          description
            "Path discovery response list.";
          leaf response-index {
            type uint32;



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            description
            "Response index.";
          }

          leaf status-code {
            type int32;
            description
            "Error code is ";
          }

          leaf status-sub-code {
            type uint8;
            description
            "Sub code is ";
          }

          leaf pd-persistent-id {
            type string;
            description
                        "Id to act as a cookie.";
          }
        }
      }
    }

    rpc pd-persistent-modify {
      description
        "Modifies persistent path discovery.";
      input {
        leaf pd-persistent-id {
          type string;
          description "Cookie Id to be used for modifications.";
        }

        leaf data-export-method {
          type export-method;
          description "Type of export.";
        }

        choice pd-trigger {
          description
            "Defines necessary conditions for periodic or on-change
             trigger.";
          case periodic {
            description "Periodic reports.";
            leaf period {
              type yang:timeticks;
              description



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                          "Time interval between reports.";
            }
            leaf start-time {
              type yang:date-and-time;
              description
                          "Timestamp from which reports are started.";
            }
          }
          case on-change {
            description
                        "On-change trigger and not periodic.";
            leaf all-data-on-start {
              type boolean;
              description
                          "Full update needed on start or not.";
            }
            leaf-list excluded-change {
              type change-type;
              description
                          "Restrict which changes trigger an update.";
            }
          }
        }
      }
      output {
        list response-list {
          key "response-index";
          description
            "path discovery response list.";
          leaf response-index {
            type uint32;
            description
              "response index.";
          }

          leaf status-code {
            type int32;
            description
              "error code is ";
          }

          leaf status-sub-code {
            type uint8;
            description
              "sub code is ";
          }

          leaf pd-persistent-id {



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            type string;
            description "Id to act as a cookie.";
          }
        }
      }
    }

    rpc pd-persistent-delete  {
      description
        "Deletes persistent path discovery.";
      input {
        leaf pd-persistent-id {
          type string;
          description "Cookie Id to be used in deletion.";
        }
      }

      output {
        list response-list {
          key "response-index";
          description
            "path discovery response list.";
          leaf response-index {
            type uint32;
            description
              "response index.";
          }

          leaf status-code {
            type int32;
            description
              "error code is ";
          }

          leaf status-sub-code {
            type uint8;
            description
              "sub code is ";
          }
        }
      }
    }
}

   <CODE ENDS>






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5.  Security Considerations

   The YANG modules defined in this memo are 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.  Some of the RPC operations in the
   "ietf-connectionless-oam-methods" YANG module may be considered
   sensitive or vulnerable in some network environments.  It is thus
   important to control access to these operations.

   These are the operations and their sensitivity/vulnerability:

   o continuity-check: Generates continuity check.

   o path-discovery: Generates path discovery.

6.  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-methods

   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-methods

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

   prefix: coam-methods

   reference: RFC XXXX

7.  References







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7.1.  Normative References

   [I-D.ietf-lime-yang-connectionless-oam]
              Kumar, D., Wang, Z., Wu, Q., Rahman, R., and S. Raghavan,
              "Generic YANG Data Model for Connectionless Operations,
              Administration, and Maintenance(OAM) protocols", draft-
              ietf-lime-yang-connectionless-oam-03 (work in progress),
              December 2016.

   [I-D.ietf-netconf-yang-push]
              Clemm, A., Voit, E., Prieto, A., Tripathy, A., Nilsen-
              Nygaard, E., Bierman, A., and B. Lengyel, "Subscribing to
              YANG datastore push updates", draft-ietf-netconf-yang-
              push-04 (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>.

   [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>.

   [RFC7011]  Claise, B., Ed., Trammell, B., Ed., and P. Aitken,
              "Specification of the IP Flow Information Export (IPFIX)
              Protocol for the Exchange of Flow Information", STD 77,
              RFC 7011, DOI 10.17487/RFC7011, September 2013,
              <http://www.rfc-editor.org/info/rfc7011>.



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

7.2.  Informative References

   [RFC4379]  Kompella, K. and G. Swallow, "Detecting Multi-Protocol
              Label Switched (MPLS) Data Plane Failures", RFC 4379,
              DOI 10.17487/RFC4379, February 2006,
              <http://www.rfc-editor.org/info/rfc4379>.

   [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>.

   [RFC5880]  Katz, D. and D. Ward, "Bidirectional Forwarding Detection
              (BFD)", RFC 5880, DOI 10.17487/RFC5880, June 2010,
              <http://www.rfc-editor.org/info/rfc5880>.

   [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>.

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







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   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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