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Network Working Group                                           D. Kumar
Internet-Draft                                                     Cisco
Intended status: Standards Track                                 M. Wang
Expires: May 4, 2017                                               Q. Wu
                                                                  Huawei
                                                               R. Rahman
                                                             S. Raghavan
                                                                   Cisco
                                                        October 31, 2016


    Retrieval Methods YANG Data Model for Connectionless Operations,
             Administration, and Maintenance(OAM) protocols
           draft-ietf-lime-yang-connectionless-oam-methods-00

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 nested OAM workflows (i.e., performing OAM functions at
   different or same levels through a unified interface).

Status of This Memo

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

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

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

   This Internet-Draft will expire on May 4, 2017.

Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.





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

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Tree Diagrams . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Overview of the Connectionless OAM retrieval methods Model  .   4
     3.1.  RPC definitions . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  OAM Retrieval Methods Hierarchy . . . . . . . . . . . . .   8
   4.  OAM Retrieval Methods YANG Module . . . . . . . . . . . . . .  16
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  20
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  20
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .  20
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  21

1.  Introduction

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

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

   2.  Troubleshoot failures (Fault verification and localization).

   3.  Monitor Performance

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

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

   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 [lime



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   base model]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[lime base model]
   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

   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:



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   Each node is printed as:

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

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


   <flags> is one of:

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


   <name> is the name of the node

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

   <opts> is one of:

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

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

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 will allow the user to flexibility to retrieve the
   retrieved-data which defined by the base data model[lime base model].

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



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   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, while the path-discovery rpc command corresponds to IP
   Traceroute.

   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, lsp ping), 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.

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



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             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.";
             }
                     description
                     "error code list.";
           }

           uses coam:continuity-check-data;
         }
       }

       rpc path-discovery {
         description
           "Generates path discovery as per RFC7276.";
         input {



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           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 {
           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 ";



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             }
           }

           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-address-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
   |  |  |     +--:(src-dst-address)
   |  |  |     |  +---w src-ip-address?          inet:ip-address
   |  |  |     |  +---w dst-ip-address?          inet:ip-address
   |  |  |     |  +---w Interface?               if:interface-ref
   |  |  |     +--:(fec)
   |  |  |     |  +---w fec-type?                fec-type
   |  |  |     |  +---w (fec-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



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   |  |  |     |     +--:(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
   |  |  |     +--:(tlv-address)
   |  |  |     |  +---w tlv-type?                int16
   |  |  |     |  +---w tlv-len?                 int16
   |  |  |     |  +---w tlv-value?               binary
   |  |  |     +--:(system-info)
   |  |  |        +---w system-id?               inet:uri
   |  |  +---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-address-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
   |     |  |  +--:(src-dst-address)
   |     |  |  |  +--ro src-ip-address?          inet:ip-address
   |     |  |  |  +--ro dst-ip-address?          inet:ip-address
   |     |  |  |  +--ro Interface?               if:interface-ref
   |     |  |  +--:(fec)
   |     |  |  |  +--ro fec-type?                fec-type
   |     |  |  |  +--ro (fec-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
   |     |  |  +--:(tlv-address)
   |     |  |  |  +--ro tlv-type?                int16
   |     |  |  |  +--ro tlv-len?                 int16
   |     |  |  |  +--ro tlv-value?               binary
   |     |  |  +--:(system-info)
   |     |  |     +--ro system-id?               inet:uri
   |     |  +--ro egress-intf-name?        if:interface-ref
   |     +--ro dest-test-point
   |     |  +--ro vrf?                     routing-instance-ref
   |     |  +--ro tp-address-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
   |     |  |  +--:(src-dst-address)
   |     |  |  |  +--ro src-ip-address?          inet:ip-address
   |     |  |  |  +--ro dst-ip-address?          inet:ip-address
   |     |  |  |  +--ro Interface?               if:interface-ref
   |     |  |  +--:(fec)
   |     |  |  |  +--ro fec-type?                fec-type
   |     |  |  |  +--ro (fec-value)?
   |     |  |  |     +--:(ip-prefix)
   |     |  |  |     |  +--ro ip-prefix?               inet:ip-prefix
   |     |  |  |     +--:(bgp)
   |     |  |  |     |  +--ro bgp?                     inet:ip-prefix
   |     |  |  |     +--:(tunnel)
   |     |  |  |     |  +--ro tunnel-interface?        uint32



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   |     |  |  |     +--:(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
   |     |  |  +--:(tlv-address)
   |     |  |  |  +--ro tlv-type?                int16
   |     |  |  |  +--ro tlv-len?                 int16
   |     |  |  |  +--ro tlv-value?               binary
   |     |  |  +--:(system-info)
   |     |  |     +--ro system-id?               inet:uri
   |     |  +--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 path-discovery
      +---w input
      |  +---w destination-tp



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      |  |  +---w tp-address-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
      |  |     +--:(src-dst-address)
      |  |     |  +---w src-ip-address?          inet:ip-address
      |  |     |  +---w dst-ip-address?          inet:ip-address
      |  |     |  +---w Interface?               if:interface-ref
      |  |     +--:(fec)
      |  |     |  +---w fec-type?                fec-type
      |  |     |  +---w (fec-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
      |  |     +--:(tlv-address)
      |  |     |  +---w tlv-type?                int16
      |  |     |  +---w tlv-len?                 int16
      |  |     |  +---w tlv-value?               binary
      |  |     +--:(system-info)
      |  |        +---w system-id?               inet:uri
      |  +---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



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      +--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-address-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
         |     +--:(src-dst-address)
         |     |  +--ro src-ip-address?          inet:ip-address
         |     |  +--ro dst-ip-address?          inet:ip-address
         |     |  +--ro Interface?               if:interface-ref
         |     +--:(fec)
         |     |  +--ro fec-type?                fec-type
         |     |  +--ro (fec-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
         |     +--:(tlv-address)
         |     |  +--ro tlv-type?                int16
         |     |  +--ro tlv-len?                 int16
         |     |  +--ro tlv-value?               binary



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         |     +--:(system-info)
         |        +--ro system-id?               inet:uri
         +--ro dest-test-point
         |  +--ro vrf?                     routing-instance-ref
         |  +--ro tp-address-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
         |     +--:(src-dst-address)
         |     |  +--ro src-ip-address?          inet:ip-address
         |     |  +--ro dst-ip-address?          inet:ip-address
         |     |  +--ro Interface?               if:interface-ref
         |     +--:(fec)
         |     |  +--ro fec-type?                fec-type
         |     |  +--ro (fec-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
         |     +--:(tlv-address)
         |     |  +--ro tlv-type?                int16
         |     |  +--ro tlv-len?                 int16
         |     |  +--ro tlv-value?               binary
         |     +--:(system-info)
         |        +--ro system-id?               inet:uri
         +--ro sequence-number?             uint64



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         +--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-address-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
               |  +--:(src-dst-address)
               |  |  +--ro src-ip-address?          inet:ip-address
               |  |  +--ro dst-ip-address?          inet:ip-address
               |  |  +--ro Interface?               if:interface-ref
               |  +--:(fec)
               |  |  +--ro fec-type?                fec-type
               |  |  +--ro (fec-value)?
               |  |     +--:(ip-prefix)
               |  |     |  +--ro ip-prefix?               inet:ip-prefix
               |  |     +--:(bgp)



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               |  |     |  +--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
               |  +--:(tlv-address)
               |  |  +--ro tlv-type?                int16
               |  |  +--ro tlv-len?                 int16
               |  |  +--ro tlv-value?               binary
               |  +--:(system-info)
               |     +--ro system-id?               inet:uri
               +--ro timestamp-val?           yang:date-and-time
               +--ro ingress-intf-name?       if:interface-ref
               +--ro egress-intf-name?        if:interface-ref
               +--ro app-meta-data?           uint32

                  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;
    }

    organization "IETF LIME Working Group";



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    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 2016-06-23 {
      description
        "06 version";
      reference "";
    }

    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.";
        }
        leaf count {
          type uint32;
          default "5";
          description



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            "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.";
          }
                  description
                  "error code list.";
        }

        uses coam:continuity-check-data;
      }
    }



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    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 {
        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 ";
          }



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          leaf status-sub-code {
            type uint8;

                    description
                    "sub code is ";
          }
        }

        uses coam:path-discovery-data;

       }
    }
}

                            YANG module of OAM

   <CODE ENDS>

5.  Security Considerations

   TBD.

6.  IANA Considerations

   This document registers a URI in the IETF XML registry [RFC3688]
   [RFC3688].  Following the format in RFC 3688, the following
   registration is requested to be made:

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

   Registrant Contact: The IESG.

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

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

name: ietf-connectionless-oam namespace: urn:ietf:params:xml:ns:yang:ietf-connectionless-oam
   prefix: goam reference: RFC XXXX

7.  Normative References

   [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>.





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

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

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

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

Authors' Addresses

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

   Email: dekumar@cisco.com


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

   Email: wangzitao@huawei.com


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

   Email: bill.wu@huawei.com







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   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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