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In: Edit-wait
Network Working Group                                           D. Kumar
Internet-Draft                                                     Cisco
Intended status: Standards Track                                 M. Wang
Expires: May 16, 2018                                         Q. Wu, Ed.
                                                                  Huawei
                                                               R. Rahman
                                                             S. Raghavan
                                                                   Cisco
                                                       November 12, 2017


  Retrieval Methods YANG Data Model for the Management of Operations,
Administration, and Maintenance (OAM) Protocols that use Connectionless
                             Communications
           draft-ietf-lime-yang-connectionless-oam-methods-13

Abstract

   This document presents a retrieval method YANG Data model for
   connectionless OAM protocols.  It provides technology-independent RPC
   operations for OAM protocols that use connectionless communication.
   The retrieval methods model herein presented can be extended to
   include technology specific details.  There are two key benefits of
   this approach: First, it leads to uniformity between OAM protocols.
   And second, it support both nested OAM workflows (i.e., performing
   OAM functions at different or same levels through a unified
   interface) as well as 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 https://datatracker.ietf.org/drafts/current/.

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

   This Internet-Draft will expire on May 16, 2018.






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Copyright Notice

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

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

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Tree Diagrams . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Overview of the Connectionless OAM retrieval methods Model  .   5
     3.1.  RPC operation definitions . . . . . . . . . . . . . . . .   5
     3.2.  OAM Retrieval Methods Hierarchy . . . . . . . . . . . . .   8
   4.  OAM Retrieval Methods YANG Module . . . . . . . . . . . . . .  15
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  23
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  23
   7.  Acknowlegements . . . . . . . . . . . . . . . . . . . . . . .  24
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  24
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  24
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  25
   Appendix A.  Appdendix A.1 Extending Connectionless OAM Method
                Module Example . . . . . . . . . . . . . . . . . . .  26
   Appendix B.  Appendix A.2 Example of new retrieval procedures
                Model  . . . . . . . . . . . . . . . . . . . . . . .  26
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  36

1.  Introduction

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

   1.  Monitor network communications (i.e., Reachability Verification,
       Continuity Check)

   2.  Troubleshoot failures (i.e., Fault verification and Localization)





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   3.  Monitor service-level agreements and performance (i.e.,
       Performance Management)

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

   Ping and Traceroute [RFC792] [RFC4443], as well as BFD [RFC5880] are
   well-known fault verification and isolation tools, respectively, for
   IP networks.  Over the years, different technologies have developed
   similar toolsets for equivalent purposes.

   This document presents an on-demand retrieval method YANG Data model
   for OAM protocols that use connectionless communication.  This model
   provides technology-independent RPC operations for OAM protocols that
   use connectionless communication (i.e., connectionless oam).  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 generic YANG data model for connectionless OAM.

2.  Conventions used in this document

   The following terms are defined in [RFC6241] and are used in this
   document:

   o  client

   o  configuration data

   o  server

   o  state data

   The following terms are defined in [RFC6020] and are used in this
   document:

   o  augment

   o  data model

   o  data node

   The terminology for describing YANG data models is found in
   [RFC6020].





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2.1.  Terminology

   TP - Test Point

   MAC - Media Access Control

   RPC - Remote Procedure Call

   RPC Operation - A specific Remote Procedure Call

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






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3.  Overview of the Connectionless OAM retrieval methods Model

   This document describes an On-demand retrieval method YANG Data model
   for OAM protocols that use connectionless communication.  This model
   provides technology-independent retrieval procedures (RPC operations)
   for connectionless OAM protocols.  It provides a flexible way to
   retrieve the data which defined by the "ietf-connectionless-oam.yang"
   module [I-D.ietf-lime-yang-connectionless-oam].

3.1.  RPC operation 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 common OAM
   functions and define two generic RPC operations: 'continuity-check'
   and 'path-discovery'.  In practice, these RPC operations are
   activated on-demand and 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 operation corresponds to IP Traceroute
   [RFC792] [RFC4443].

   Note that the RPC operation 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], and LSP Ping
   [RFC8029]).  This base building block should be extended with
   corresponding technology specific parameters.  To facilitate this for
   future enhancements to data retrieval methods, the RPCs are captured
   under a separate module.

   The generic 'tp-address' grouping is used as data input from
   different RPCs described in this document.  The generic 'path-
   discovery-data' and 'continuity-check-data' groupings defined by the
   "ietf-connectionless-oam.yang" module
   [I-D.ietf-lime-yang-connectionless-oam]are used as data outputs from
   different RPCs described in this document.  Similar methods including
   other RPCs can retrieve the data using the same data model (i.e., the
   "ietf-connectionless-oam.yang" module).

     rpc continuity-check {
      if-feature cl-oam:continuity-check;
      description
        "Continuity-check RPC operation as per RFC7276.";
      input {
      uses rpc-input-parameters;
      ....



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      }
    output {
      container response-info {
        leaf protocol-id {
          type identityref {
            base protocol-id;
          }
          mandatory true;
          description
            "Protocol used in CC. ";
        }
        leaf protocol-id-meta-data {
           type identityref {
            base protocol-id-meta-data;
            }
             description
             "An optional meta-data related to the protocol ID.";
        }
        leaf status-code {
          type identityref{
         base status-code;
       }
          mandatory true;
          description
            "Status code for Continuity Check RPC operation.";
        }
        leaf status-sub-code {
          type identityref{
          base status-sub-code;
       }
          mandatory true;
          description
            "Status Sub code for Continuity Check RPC operation.";
        }
        description
          "Status Code and Status Sub Code for continuity check RPC operation.";
      }
      uses cl-oam:continuity-check-data;
    }
  }

    rpc path-discovery {
      description
        "path discovery RPC operation as per RFC7276.";
      input {
      uses rpc-input-parameters;
      .....
      }



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    output {
      list response-list {
        key "response-index";
        description
          "Path discovery response list.";
        leaf response-index {
          type uint32;
          mandatory true;
          description
            "Response index.";
        }
        leaf protocol-id {
          type identityref {
            base protocol-id;
          }
          mandatory true;
          description
            "Protocol used in PD. ";
        }
        leaf protocol-id-meta-data {
           type identityref {
            base protocol-id-meta-data;
            }
             description
             "An optional meta-data related to the protocol ID.";
        }
        leaf status-code {
          type identityref{
          base status-code;
        }
          mandatory true;
          description
            "Status code for Path Discovery RPC operation. ";
        }
        leaf status-sub-code {
          type identityref{
          base status-sub-code;
       }
          mandatory true;
          description
            "Status Sub code for Path Discovery RPC operation. ";
        }
      }
      uses cl-oam:path-discovery-data;
    }
  }

            Snippet of data hierarchy related to RPC operations



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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 {cl-oam:continuity-check}?
   |  +---w input
   |  |  +---w destination-tp
   |  |  |  +---w tp-location-type    identityref
   |  |  |  +---w mac-address
   |  |  |  |  +---w mac-address    yang:mac-address
   |  |  |  +---w ipv4-address
   |  |  |  |  +---w ipv4-address    inet:ipv4-address
   |  |  |  +---w ipv6-address
   |  |  |  |  +---w ipv6-address    inet:ipv6-address
   |  |  |  +---w tp-attribute
   |  |  |  |  +---w tp-attribute-type?     address-attribute-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?   rt:route-distinguisher
   |  |  |  |     |  +---w sender-ve-id?          uint16
   |  |  |  |     |  +---w receiver-ve-id?        uint16
   |  |  |  |     +--:(mpls-mldp)
   |  |  |  |        +---w (root-address)?
   |  |  |  |           +--:(ip-address)
   |  |  |  |           |  +---w source-address?        inet:ip-address
   |  |  |  |           |  +---w group-ip-address?      inet:ip-address
   |  |  |  |           +--:(vpn)
   |  |  |  |           |  +---w as-number?             inet:as-number
   |  |  |  |           +--:(global-id)
   |  |  |  |              +---w lsp-id?                string
   |  |  |  +---w system-info
   |  |  |     +---w router-id?   rt:router-id
   |  |  +---w source-interface      if:interface-ref
   |  |  +---w outbound-interface    if:interface-ref
   |  |  +---w vrf?                  cl-oam:routing-instance-ref
   |  |  +---w session-type?         enumeration



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   |  |  +---w count?                uint32
   |  |  +---w ttl?                  uint8
   |  |  +---w packet-size?          uint32
   |  +--ro output
   |     +--ro response-info
   |     |  +--ro protocol-id              identityref
   |     |  +--ro protocol-id-meta-data?   identityref
   |     |  +--ro status-code              identityref
   |     |  +--ro status-sub-code          identityref
   |     +--ro src-test-point
   |     |  +--ro ni?                 routing-instance-ref
   |     |  +--ro tp-location-type    identityref
   |     |  +--ro mac-address
   |     |  |  +--ro mac-address    yang:mac-address
   |     |  +--ro ipv4-address
   |     |  |  +--ro ipv4-address    inet:ipv4-address
   |     |  +--ro ipv6-address
   |     |  |  +--ro ipv6-address    inet:ipv6-address
   |     |  +--ro tp-attribute
   |     |  |  +--ro tp-attribute-type?     address-attribute-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?   rt:route-distinguisher
   |     |  |     |  +--ro sender-ve-id?          uint16
   |     |  |     |  +--ro receiver-ve-id?        uint16
   |     |  |     +--:(mpls-mldp)
   |     |  |        +--ro (root-address)?
   |     |  |           +--:(ip-address)
   |     |  |           |  +--ro source-address?        inet:ip-address
   |     |  |           |  +--ro group-ip-address?      inet:ip-address
   |     |  |           +--:(vpn)
   |     |  |           |  +--ro as-number?             inet:as-number
   |     |  |           +--:(global-id)
   |     |  |              +--ro lsp-id?                string
   |     |  +--ro system-info
   |     |  |  +--ro router-id?   rt:router-id
   |     |  +--ro egress-intf-name?   if:interface-ref
   |     +--ro dest-test-point
   |     |  +--ro ni?                  routing-instance-ref



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   |     |  +--ro tp-location-type     identityref
   |     |  +--ro mac-address
   |     |  |  +--ro mac-address    yang:mac-address
   |     |  +--ro ipv4-address
   |     |  |  +--ro ipv4-address    inet:ipv4-address
   |     |  +--ro ipv6-address
   |     |  |  +--ro ipv6-address    inet:ipv6-address
   |     |  +--ro tp-attribute
   |     |  |  +--ro tp-attribute-type?     address-attribute-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?   rt:route-distinguisher
   |     |  |     |  +--ro sender-ve-id?          uint16
   |     |  |     |  +--ro receiver-ve-id?        uint16
   |     |  |     +--:(mpls-mldp)
   |     |  |        +--ro (root-address)?
   |     |  |           +--:(ip-address)
   |     |  |           |  +--ro source-address?        inet:ip-address
   |     |  |           |  +--ro group-ip-address?      inet:ip-address
   |     |  |           +--:(vpn)
   |     |  |           |  +--ro as-number?             inet:as-number
   |     |  |           +--:(global-id)
   |     |  |              +--ro lsp-id?                string
   |     |  +--ro system-info
   |     |  |  +--ro router-id?   rt: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-loss-count?          uint32
   |     |  +--ro loss-ratio?                 percentage
   |     |  +--ro packet-reorder-count?       uint32
   |     |  +--ro packets-out-of-seq-count?   uint32
   |     |  +--ro packets-dup-count?          uint32



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   |     +--ro session-delay-statistics
   |     |  +--ro time-unit-value?       identityref
   |     |  +--ro min-delay-value?       uint32
   |     |  +--ro max-delay-value?       uint32
   |     |  +--ro average-delay-value?   uint32
   |     +--ro session-jitter-statistics
   |        +--ro unit-value?             identityref
   |        +--ro min-jitter-value?       uint32
   |        +--ro max-jitter-value?       uint32
   |        +--ro average-jitter-value?   uint32
   +---x path-discovery {cl-oam:path-discovery}?
      +---w input
      |  +---w destination-tp
      |  |  +---w tp-location-type    identityref
      |  |  +---w mac-address
      |  |  |  +---w mac-address    yang:mac-address
      |  |  +---w ipv4-address
      |  |  |  +---w ipv4-address    inet:ipv4-address
      |  |  +---w ipv6-address
      |  |  |  +---w ipv6-address    inet:ipv6-address
      |  |  +---w tp-attribute
      |  |  |  +---w tp-attribute-type?     address-attribute-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?   rt:route-distinguisher
      |  |  |     |  +---w sender-ve-id?          uint16
      |  |  |     |  +---w receiver-ve-id?        uint16
      |  |  |     +--:(mpls-mldp)
      |  |  |        +---w (root-address)?
      |  |  |           +--:(ip-address)
      |  |  |           |  +---w source-address?        inet:ip-address
      |  |  |           |  +---w group-ip-address?      inet:ip-address
      |  |  |           +--:(vpn)
      |  |  |           |  +---w as-number?             inet:as-number
      |  |  |           +--:(global-id)
      |  |  |              +---w lsp-id?                string
      |  |  +---w system-info
      |  |     +---w router-id?   rt:router-id
      |  +---w source-interface      if:interface-ref



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      |  +---w outbound-interface    if:interface-ref
      |  +---w vrf?                  cl-oam:routing-instance-ref
      |  +---w session-type?         enumeration
      |  +---w max-ttl?              uint8
      +--ro output
         +--ro response-list* [response-index]
         |  +--ro response-index           uint32
         |  +--ro protocol-id              identityref
         |  +--ro protocol-id-meta-data?   identityref
         |  +--ro status-code              identityref
         |  +--ro status-sub-code          identityref
         +--ro src-test-point
         |  +--ro ni?                 routing-instance-ref
         |  +--ro tp-location-type    identityref
         |  +--ro mac-address
         |  |  +--ro mac-address    yang:mac-address
         |  +--ro ipv4-address
         |  |  +--ro ipv4-address    inet:ipv4-address
         |  +--ro ipv6-address
         |  |  +--ro ipv6-address    inet:ipv6-address
         |  +--ro tp-attribute
         |  |  +--ro tp-attribute-type?     address-attribute-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?   rt:route-distinguisher
         |  |     |  +--ro sender-ve-id?          uint16
         |  |     |  +--ro receiver-ve-id?        uint16
         |  |     +--:(mpls-mldp)
         |  |        +--ro (root-address)?
         |  |           +--:(ip-address)
         |  |           |  +--ro source-address?        inet:ip-address
         |  |           |  +--ro group-ip-address?      inet:ip-address
         |  |           +--:(vpn)
         |  |           |  +--ro as-number?             inet:as-number
         |  |           +--:(global-id)
         |  |              +--ro lsp-id?                string
         |  +--ro system-info
         |     +--ro router-id?   rt:router-id
         +--ro dest-test-point



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         |  +--ro ni?                 routing-instance-ref
         |  +--ro tp-location-type    identityref
         |  +--ro mac-address
         |  |  +--ro mac-address    yang:mac-address
         |  +--ro ipv4-address
         |  |  +--ro ipv4-address    inet:ipv4-address
         |  +--ro ipv6-address
         |  |  +--ro ipv6-address    inet:ipv6-address
         |  +--ro tp-attribute
         |  |  +--ro tp-attribute-type?     address-attribute-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?   rt:route-distinguisher
         |  |     |  +--ro sender-ve-id?          uint16
         |  |     |  +--ro receiver-ve-id?        uint16
         |  |     +--:(mpls-mldp)
         |  |        +--ro (root-address)?
         |  |           +--:(ip-address)
         |  |           |  +--ro source-address?        inet:ip-address
         |  |           |  +--ro group-ip-address?      inet:ip-address
         |  |           +--:(vpn)
         |  |           |  +--ro as-number?             inet:as-number
         |  |           +--:(global-id)
         |  |              +--ro lsp-id?                string
         |  +--ro system-info
         |     +--ro router-id?   rt: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-loss-count?          uint32
         |  +--ro loss-ratio?                 percentage
         |  +--ro packet-reorder-count?       uint32
         |  +--ro packets-out-of-seq-count?   uint32
         |  +--ro packets-dup-count?          uint32



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         +--ro session-delay-statistics
         |  +--ro time-unit-value?       identityref
         |  +--ro min-delay-value?       uint32
         |  +--ro max-delay-value?       uint32
         |  +--ro average-delay-value?   uint32
         +--ro session-jitter-statistics
         |  +--ro unit-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 ni?                     routing-instance-ref
               +--ro tp-location-type        identityref
               +--ro mac-address
               |  +--ro mac-address    yang:mac-address
               +--ro ipv4-address
               |  +--ro ipv4-address    inet:ipv4-address
               +--ro ipv6-address
               |  +--ro ipv6-address    inet:ipv6-address
               +--ro tp-attribute
               |  +--ro tp-attribute-type?     address-attribute-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?   rt:route-distinguisher
               |     |  +--ro sender-ve-id?          uint16
               |     |  +--ro receiver-ve-id?        uint16
               |     +--:(mpls-mldp)
               |        +--ro (root-address)?
               |           +--:(ip-address)
               |           |  +--ro source-address?        inet:ip-address
               |           |  +--ro group-ip-address?      inet:ip-address
               |           +--:(vpn)



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               |           |  +--ro as-number?             inet:as-number
               |           +--:(global-id)
               |              +--ro lsp-id?                string
               +--ro system-info
               |  +--ro router-id?   rt:router-id
               +--ro timestamp-type?         identityref
               +--ro timestamp-64bit
               |  +--ro timestamp-sec?       uint32
               |  +--ro timestamp-nanosec?   uint32
               +--ro timestamp-80bit {ptp-long-format}?
               |  +--ro timestamp-sec?       uint64
               |  +--ro timestamp-nanosec?   uint32
               +--ro ntp-timestamp-32bit {ntp-short-format}?
               |  +--ro timestamp-sec?       uint16
               |  +--ro timestamp-nanosec?   uint16
               +--ro icmp-timestamp-32bit {icmp-timestamp}?
               |  +--ro timestamp-millisec?   uint32
               +--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

                  data hierarchy of OAM Retrieval Methods

4.  OAM Retrieval Methods YANG Module

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

module ietf-connectionless-oam-methods {
namespace "urn:ietf:params:xml:ns:yang:ietf-connectionless-oam-methods";
 prefix cloam-methods;
 import ietf-interfaces {
  prefix if;
 }
 import ietf-connectionless-oam {
  prefix cl-oam;
 }
  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 RPC operations for



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     connectionless OAM to be used within IETF
     in a protocol Independent manner.
     It is assumed that each protocol maps
     corresponding abstracts to its native format.
     Each protocol may extend the YANG model defined
     here to include protocol specific extensions";

  revision 2017-09-06{
    description
      "08 version";
    reference "draft-ietf-lime-yang-connectionless-oam-methods";
  }
  identity protocol-id {
    description
    "This is base identity for a generic protocol ID. The protocol
     registry can be found in https://www.iana.org/protocols.";
  }
  identity protocol-id-internet {
    base protocol-id;
    description
      "Identity for Internet Protocols.";
  }
  identity protocol-id-proprietary {
    base protocol-id;
    description
      "Identity for proprietary protocol (e.g.,IP SLA).";
  }
  identity protocol-id-sfc {
    base protocol-id;
    description
      "Identity for Service Function Chaining.";
  }
  identity protocol-id-mpls {
    base protocol-id;
    description
      "MPLS protocol.";
  }
  identity protocol-id-mpls-tp {
    base protocol-id;
    description
      "MPLS-TP protocol.";
  }
  identity protocol-id-twamp {
    base protocol-id;
    description
      "TWAMP protocol.";
  }
  identity protocol-id-bier {



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    base protocol-id;
    description
      "BIER protocol.";
  }
  identity status-code {
   description
   "This is Base Identity for status code.";
  }
  identity success-reach {
    base status-code;
   description
   "Indicate that the destination being verified
    is reachable (See RFC7276).";
  }
  identity fail-reach {
    base status-code;
   description
   "Indicate that the destination being verified
    is not reachable (See RFC7276).";
  }
  identity success-path-verification {
    base status-code;
   description
   "Indicate that the path verification is performed
   successfully (See RFC7276).";
  }
  identity fail-path-verification {
    base status-code;
   description
   "Indicate that the path verification fails (See RFC7276).";
  }
  identity status-sub-code {
   description
   "IdentityBase status sub code.";
  }
    identity invalid-cc {
   base status-sub-code;
   description
   "Indicates that the Continuity check message is invalid (See RFC7276).";
  }
  identity invalid-pd {
   base status-sub-code;
   description
   "Indicates that the path discovery message is invalid (See RFC7276).";
  }
  identity protocol-id-meta-data {
    description
    "This is base identity for meta-data corresponding



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     to protocol ID.";
  }
  identity protocol-internet-number {
    base protocol-id-meta-data;
    description
      "Internet Protocol Number for standard
     Internet Protocols (IANA assigned Internet
     Protocol numbers) to help in protocol processing.
     The protocol IDs registry can be found in
     https://www.iana.org/assignments/protocol-numbers
     /protocol-numbers.xhtml.";
  }

  grouping rpc-input-parameters {
     container destination-tp {
       uses cl-oam:tp-address;
         description
         "Destination test point.";
       }
       leaf source-interface {
         type if:interface-ref;
         mandatory true;
         description
          "Source interface.";
       }
      leaf outbound-interface {
         type if:interface-ref;
         mandatory true;
         description
          "Outbound interface.";
      }
      leaf vrf {
         type cl-oam:routing-instance-ref;
         description
          "VRF instance.";
      }
    description
   "Grouping for RPC input parameters";
  }
  rpc continuity-check {
     if-feature "cl-oam:continuity-check";
     description
     "Continuity-check RPC operation as per RFC7276.";
    input {
        uses rpc-input-parameters;
        uses cl-oam:session-type {
         description
      "If session-type is specified, then session-type



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          must be set to on-demand";
       }
        leaf count {
        type uint32 {
         range 0..4294967295 {
             description
             "The overall number of packet to be transmitted
             by the sender. The value of count will be set
            to zero (0) on creation and will thereafter increase
            monotonically until it reaches a maximum value of 2^32-1
            (4294967295 decimal), when it wraps around and starts
            increasing again from zero.";
            }
        }
        default "5";
        description
          "Specifies the number of
          packets that will be sent. By
          default, the packet number is
          set to 5.";
       }
        leaf ttl {
        type uint8;
        default "255";
        description
         "Time to live (TTL) used to limit lifetime
         of data packet transmitted in the network
         and prevent looping. The TTL value is decremented
         for every hop which the packet traverses. If the
         TTL is zero, the data packet will be discarded.";
      }
      leaf packet-size {
         type uint32 {
         range "64..10000";
        }
        default "64";
        description
         "Packet size of continuity-check message, in octets.
         By default, the packet size is set to 64 octets.";
      }
    }
    output {
    container response-info {
        leaf protocol-id {
          type identityref {
            base protocol-id;
          }
          mandatory true;



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             description
             "Protocol used in continuity check message.
             This could be a standard protocol (e.g.,
             TCP/IP protocols, MPLS etc.,) or a proprietary
             protocol as identified by this field.";
        }
        leaf protocol-id-meta-data {
         type identityref {
            base protocol-id-meta-data;
            }
             description
             "An optional meta-data related to the protocol ID.
             For e.g., this could be the Internet Protocol number
             for standard Internet Protocols for help in protocol
             processing.";
        }
        leaf status-code {
          type identityref{
          base status-code;
          }
          mandatory true;
          description
           "Status code for continuity check RPC operation.
           This could be a basic status code (e.g., destination
           is reachable or destination is not reachable (See RFC7276))
           or some customized status code as identified by this field.";
        }
        leaf status-sub-code {
            type identityref{
            base status-sub-code;
          }
          mandatory true;
          description
          "An optional status sub code for continuity check
          RPC operation. If the basic status code is destination
          reachable, this status-sub-code doesn't need to be specified.
          If the basic status code is destination unreachable, the
          status-sub-code can be used to specify the detailed reasons.
          This could be a basic sub-status-code (such as invalid cc) or
          other error codes specific to the protocol under use for CC
          For example if ICMP is the protocol under use, the error codes
          defined in [RFC4443] can be used to specify the reasons specific to
          ICMP. These technology specific status-sub-code can be defined
          in technology specific models.";
        }
        description
         "Status Code and Status sub code for continuity check RPC operation.";
      }



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      uses cl-oam:continuity-check-data;
    }
  }

  rpc path-discovery {
    if-feature "cl-oam:path-discovery";
    description
      "Path discovery RPC operation as per RFC7276.";
    input {
      uses rpc-input-parameters;
      uses cl-oam:session-type {
         description
       "If session-type is specified, then session-type
         must be set to on-demand";
    }
      leaf max-ttl {
        type uint8;
        default "255";
         description
          "Maximum TTL indicates the maixmum number of hops that
          a packet is permitted to travel before being discarded
          by a router. By default, the maximimum TTL is set to 255.";
      }
    }
    output {
      list response-list {
        key "response-index";
        description
          "Path discovery response list.";
        leaf response-index {
          type uint32;
          mandatory true;
          description
           "Response index.";
        }
        leaf protocol-id {
          type identityref {
            base protocol-id;
          }
          mandatory true;
             description
             "Protocol used in PD. This could be a standard
             protocol (e.g., TCP/IP protocols, MPLS etc.,)
             or a proprietary protocol as identified by
             this field.";
        }
        leaf protocol-id-meta-data {
          type identityref {



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            base protocol-id-meta-data;
            }
             description
             "An optional meta-data related to the protocol ID.
             For e.g., this could be the Internet Protocol number
             for standard Internet Protocols for help in protocol
             processing.";
        }
        leaf status-code {
          type identityref{
            base status-code;
          }
          mandatory true;
          description
           "Status code for continuity check RPC operation.
           This could be a basic status code (e.g., destination
           is reachable or destination is not reachable) or some
           customized status code as identified by this field.";
        }
        leaf status-sub-code {
          type identityref{
            base status-sub-code;
          }
          mandatory true;
          description
          "An optional status sub code for continuity check
          RPC operation. If the basic status code is destination
          reachable, this status-sub-code doesn't need to be specified.
          If the basic status code is destination unreachable, the
          status-sub-code can be used to specify the detailed reasons.
          This could be a basic sub-status-code (such as invalid cc) or
          other error codes specific to the protocol under use for CC
          For example if ICMP is the protocol under use, the error codes
          defined in [RFC4443] can be used to specify the reasons specific to
          ICMP. These technology specific status-sub-code can be defined
          in technology specific models.";
        }
      }
      uses cl-oam:path-discovery-data;
    }
  }
}

   <CODE ENDS>







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5.  Security Considerations

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

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

   Some of the RPC operations in this 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.

   These operations are used to retrieve the data from the device that
   need to execute the OAM command.  Unauthorized source access to some
   sensitive information in the above data may be used for network
   reconnaissance or lead to Denial-of-Service attack on both the local
   device and the network.

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



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   prefix: cloam-methods

   reference: RFC XXXX

7.  Acknowlegements

   The authors of this document would like to thank Elwyn Davies, Alia
   Atlas, Brian E Carpenter, Greg Mirsky, Adam Roach, Alissa Cooper,
   Eric Rescorla, Ben Campbell, Benoit Claise, Kathleen Moriarty, Carlos
   Pignataro, Benjamin Kaduk, and others for their substantive review,
   comments, an d proposals to improve the document.

8.  References

8.1.  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 the Management of Operations,
              Administration, and Maintenance (OAM) Protocols that use
              Connectionless Communications", draft-ietf-lime-yang-
              connectionless-oam-16 (work in progress), October 2017.

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

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

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

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

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






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

   [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,
              <https://www.rfc-editor.org/info/rfc7011>.

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

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

8.2.  Informative References

   [I-D.ietf-netconf-yang-push]
              Clemm, A., Voit, E., Prieto, A., Tripathy, A., Nilsen-
              Nygaard, E., Bierman, A., and B. Lengyel, "YANG Datastore
              Subscription", draft-ietf-netconf-yang-push-11 (work in
              progress), October 2017.

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

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

   [RFC6087]  Bierman, A., "Guidelines for Authors and Reviewers of YANG
              Data Model Documents", RFC 6087, DOI 10.17487/RFC6087,
              January 2011, <https://www.rfc-editor.org/info/rfc6087>.

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






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   [RFC8029]  Kompella, K., Swallow, G., Pignataro, C., Ed., Kumar, N.,
              Aldrin, S., and M. Chen, "Detecting Multiprotocol Label
              Switched (MPLS) Data-Plane Failures", RFC 8029,
              DOI 10.17487/RFC8029, March 2017,
              <https://www.rfc-editor.org/info/rfc8029>.

Appendix A.  Appdendix A.1 Extending Connectionless OAM Method Module
             Example

   The following is an example of extensions possible to "ietf-
   connectionless-oam-methods" YANG model defined in this document.

   The snippet below depicts an example of augmenting the "ietf-
   connectionless-oam-methods" YANG model with ICMP ping attributes:

   augment "/cloam-methods:continutiy-check"
   +"/cloam-methods:output"{
     container session-rtt-statistics{
      leaf min-rtt{
       type uint32;
    description
    "This minimum ping round-trip-time (RTT) received.";
      }
      leaf max-rtt{
       type uint32;
    description
    "This maximum ping round-trip-time (RTT) received.";
      }
      leaf avg-rtt{
       type uint32;
    description
     "The current average ping round-trip-time (RTT)";
      }
      description
      "This container presents the ping round-trip-time statistics.";
     }
   }

Appendix B.  Appendix A.2 Example of new retrieval procedures Model

   As discussed in the Introduction section of this document, the new
   retrieval procedures can be defined for retrieval of the same data
   defined by base YANG Data model for connectionless OAM protocols.
   This appendix demonstrates how the base connectionless OAM data model
   can be extended to support persistent data retrieval besides on
   demand retrieval procedures defined in section 3, i.e., first
   retrieve a persistent-id based on the destination test point location
   information and then retrieve the export details based on persistent-



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   id.  Internet Protocol Flow Information Export (IPFIX) [RFC7011] or
   YANG-push [I-D.ietf-netconf-yang-push] are currently outlined here as
   data export options.  Additional export options can be added in
   future.

   The YANG module "example-cl-oam-persistent-methods" shown below is
   intended as an illustration rather than a real definition of a RPC
   operation model for persistent data retrieval.  For the sake of
   brevity, this module does not obey all the guidelines specified in
   [RFC6087].

  module example-cl-oam-persistent-methods {
  namespace "http://example.com/cl-oam-persistent-methods";
   prefix pcloam-methods;
   import ietf-interfaces {
    prefix if;
   }
   import ietf-connectionless-oam {
    prefix cl-oam;
   }
   import ietf-yang-types {
    prefix yang;
   }
    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";
    }
    identity protocol-id {
      description
      "A generic protocol identifier.";
    }
  identity status-code {
   description
   "Base status code";
  }
  identity success-reach {
    base status-code;
   description



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   "Indicate that the destination being verified
    is reachable";
  }
  identity fail-reach {
    base status-code;
   description
   "Indicate that the destination being verified
    is not reachable";
  }
  identity success-path-verification {
    base status-code;
   description
   "Indicate that the path verification is performed
   successfully.";
  }
  identity fail-path-verification {
    base status-code;
   description
   "Indicate that the path verification fails.";
  }
  identity status-sub-code {
   description
   "Base status sub code";
  }
    identity invalid-cc {
   base status-sub-code;
   description
   "Indicates that the Continuity check message is invalid";
  }
  identity invalid-pd {
   base status-sub-code;
   description
   "Indicates that the path discovery message is invalid";
  }
    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" {



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          description
            "Change due to a delete.";
        }
        enum "modify" {
          description
            "Change due to an update.";
        }
      }
      description
        "Different types of changes that may occur.";
    }

    rpc cc-get-persistent-id {
      if-feature "cl-oam:continuity-check";
      description
        "Obtains continuity-check persistent identification given mapping
         parameters as input.";
      input {
        container destination-tp {
          uses cl-oam:tp-address;
          description
            "Destination test point.";
        }
        uses cl-oam: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 cl-oam:routing-instance-ref;
          description
            "VRF instance.";
        }
      }
      output {
        container error-code {
          leaf protocol-id {
            type identityref {
              base protocol-id;
            }
            mandatory true;
            description



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              "Protocol used. This could be a standard
               protocol (e.g., TCP/IP protocols, MPLS etc.,)
               or a proprietary protocol as identified by
               this field.";
          }
          leaf protocol-id-meta-data {
            type uint64;
            description
              "An optional meta-data related to the protocol ID.
               For e.g., this could be the Internet Protocol number
               for standard Internet Protocols for help in protocol
               processing.";
          }
          leaf status-code {
            type identityref{
              base status-code;
            }
            mandatory true;
            description
              "Status code.";
          }
          leaf status-sub-code {
            type identityref{
              base status-sub-code;
            }
            mandatory true;
            description
              "Sub code for CC.";
          }
          description
            "Status code and Sub Code.";
        }

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

    rpc cc-persistent-get-export-details {
      if-feature "cl-oam:continuity-check";
      description
        "Given the persistent id, gets the configuration
         options, details related to the configured data
         export.";
      input {



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        leaf cc-persistent-id {
          type string;
          description
            "Persistent Id for use as a key in search.";
        }
      }
      output {
        container error-code {
          leaf protocol-id {
            type identityref {
              base protocol-id;
            }
            mandatory true;
            description
              "Protocol used. This could be a standard
               protocol (e.g., TCP/IP protocols, MPLS etc.,)
               or a proprietary protocol as identified by
               this field.";
          }
          leaf protocol-id-meta-data {
            type uint64;
            description
              "An optional meta-data related to the protocol ID.
               For e.g., this could be the Internet Protocol number
               for standard Internet Protocols for help in protocol
               processing.";
          }
          leaf status-code {
            type identityref{
              base status-code;
            }
            mandatory true;
            description
              "Status code.";
          }
          leaf status-sub-code {
            type identityref{
              base status-sub-code;
            }
            mandatory true;
            description
              "Sub code for CC.";
          }
          description
            "Status code and Sub Code.";
        }

        leaf data-export-method {



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          type export-method;
          description
            "Type of export in use.";
        }

        choice cc-trigger {
          description
            "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 were started.";
            }
          }
          case on-change {
            description
              "On-change trigger and not periodic.";
            leaf all-data-on-start {
              type boolean;
              description
                "Full update done on start or not.";
            }
            leaf-list excluded-change {
              type change-type;
              description
                "Changes that will not trigger an update.";
            }
          }
        }
      }
    }

   rpc pd-get-persistent-id {
      if-feature "cl-oam:path-discovery";
      description
        "Obtains persistent path discovery identification.";

      input {
        container destination-tp {



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          uses cl-oam:tp-address;
          description
            "Destination test point.";
        }
        uses cl-oam: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 cl-oam:routing-instance-ref;
          description
            "VRF";
        }
      }
      output {
        list response-list {
          key "response-index";
          description
            "Path discovery response list.";
          leaf response-index {
            type uint32;
            mandatory true;
            description
              "Response index.";
          }
          leaf protocol-id {
            type identityref {
              base protocol-id;
            }
            mandatory true;
            description
              "Protocol used. This could be a standard
               protocol (e.g., TCP/IP protocols, MPLS etc.,)
               or a proprietary protocol as identified by
               this field.";
          }
          leaf protocol-id-meta-data {
            type uint64;
            description
              "An optional meta-data related to the protocol ID.
               For e.g., this could be the Internet Protocol number



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               for standard Internet Protocols for help in protocol
               processing.";
          }
          leaf status-code {
            type identityref {
              base status-code;
            }
            mandatory true;
            description
              "Status code for Persistent Path Discovery Information. ";
          }
          leaf status-sub-code {
            type identityref{
              base status-sub-code;
            }
            mandatory true;
            description
              "Sub code for Persistent Path Discovery Information. ";
          }
          leaf pd-persistent-id {
            type string;
            description
              "Id to act as a cookie.";
          }
        }
      }
   }

  rpc pd-persistent-get-export-details {
     if-feature "cl-oam:path-discovery";
     description
       "Given the persistent id, gets the configuration
        options, details related to the configured data
        export.";
     input {
       leaf cc-persistent-id {
         type string;
         description
           "Persistent ID for use as a key in search.";
       }
     }

     output {
       list response-list {
         key "response-index";
         description
           "Path discovery response list.";
         leaf response-index {



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           type uint32;
           mandatory true;
           description
             "Response index.";
         }
         leaf protocol-id {
           type identityref {
             base protocol-id;
           }
           mandatory true;
           description
             "Protocol used. This could be a standard
              protocol (e.g., TCP/IP protocols, MPLS etc.,)
              or a proprietary protocol as identified by
              this field.";
         }
         leaf protocol-id-meta-data {
            type uint64;
            description
              "An optional meta-data related to the protocol ID.
               For e.g., this could be the Internet Protocol number
               for standard Internet Protocols for help in protocol
               processing.";
         }
         leaf status-code {
           type identityref{
             base status-code;
           }
           mandatory true;
           description
             "Status code for Persistent Path Discovery Creation. ";
         }
         leaf status-sub-code {
           type identityref{
             base status-sub-code;
           }
           mandatory true;
           description
             "Sub code for Persistent Path Discovery Creation. ";
         }
         leaf data-export-method {
           type export-method;
           description
             "Type of export.";
         }
         choice pd-trigger {
           description
             "Necessary conditions



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              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 done on start or not.";
             }
             leaf-list excluded-change {
               type change-type;
               description
                 "Changes that will not trigger an update.";
             }
           }
         }
       }
     }
   }
 }

Authors' Addresses

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

   Email: dekumar@cisco.com






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

   Email: wangzitao@huawei.com


   Qin Wu (editor)
   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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