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RFC 8533

A YANG Data Model for Retrieval Methods for the Management of Operations, Administration, and Maintenance (OAM) Protocols That Use Connectionless Communications

Pages: 41
Proposed STD
Part 1 of 2 – Pages 1 to 25
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Internet Engineering Task Force (IETF)                          D. Kumar
Request for Comments: 8533                                         Cisco
Category: Standards Track                                        M. Wang
ISSN: 2070-1721                                               Q. Wu, Ed.
                                                                  Huawei
                                                               R. Rahman
                                                             S. Raghavan
                                                                   Cisco
                                                              April 2019


     A YANG Data Model for Retrieval Methods for the Management of
      Operations, Administration, and Maintenance (OAM) Protocols
                 That Use Connectionless Communications

Abstract

   This document presents a retrieval method YANG data model for
   connectionless Operations, Administration, and Maintenance (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.  Second, it
   supports both nested OAM workflows (i.e., performing OAM functions at
   different or the same levels through a unified interface) as well as
   interactive OAM workflows (i.e., performing OAM functions at the same
   levels through a unified interface).

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8533.
Top   ToC   Page 2
Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   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  .   4
     3.1.  RPC Operation Definitions . . . . . . . . . . . . . . . .   4
     3.2.  OAM Retrieval Methods Hierarchy . . . . . . . . . . . . .   7
   4.  OAM Retrieval Methods YANG Module . . . . . . . . . . . . . .  16
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  26
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  26
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  27
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  27
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  28
   Appendix A.  Extending Connectionless OAM Method Module Example .  29
     A.1.  Example of New Retrieval Procedures Model . . . . . . . .  29
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  40
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  41
Top   ToC   Page 3
1.  Introduction

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

   1.  monitor network communications (i.e., reachability verification
       and Continuity Check)

   2.  troubleshoot failures (i.e., fault verification and localization)

   3.  monitor service-level agreements and performance (i.e.,
       performance management)

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

   Ping and Traceroute [RFC4443], as well as Bidirectional Forwarding
   Detection (BFD) [RFC5880], are well-known fault verification and
   isolation tools, respectively, for IP networks [RFC792].  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 data model for connectionless OAM
   [RFC8532] and can avoid mixing the models for the retrieved data from
   the retrieval procedures.  It is expected that retrieval procedures
   will evolve faster than the data model [RFC8532] 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
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   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].

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

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

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 that is defined by the "ietf-connectionless-
   oam.yang" module [RFC8532].

3.1.  RPC Operation Definitions

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

   Under the "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 are supported by corresponding technology-
   specific OAM tools [RFC7276].  For example, for the IP OAM model, the
   Continuity Check RPC corresponds to the IP Ping [RFC792] [RFC4443],
Top   ToC   Page 5
   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 Label Switched
   Path (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 [RFC8532] 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 RFC 7276.";
         reference
           "RFC 7276: An Overview of Operations, Administration, and
            Maintenance (OAM) Tools";
         input {
         uses rpc-input-parameters;
         ....
         }
       output {
         container response-info {
           leaf protocol-id {
             type identityref {
               base protocol-id;
             }
             mandatory true;
             description
               "Protocol used in the Continuity Check. ";
           }
           leaf protocol-id-meta-data {
              type identityref {
               base protocol-id-meta-data;
               }
                description
                "An optional metadata related to the protocol ID.";
           }
           leaf status-code {
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             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 RFC 7276.";
         reference
           "RFC 7276: An Overview of Operations, Administration, and
            Maintenance (OAM) Tools";
         input {
         uses rpc-input-parameters;
         .....
         }
       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;
             }
Top   ToC   Page 7
             mandatory true;
             description
               "Protocol used in path discovery. ";
           }
           leaf protocol-id-meta-data {
              type identityref {
               base protocol-id-meta-data;
               }
                description
                "An optional metadata 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

3.2.  OAM Retrieval Methods Hierarchy

   The complete data hierarchy related to the Connectionless OAM
   Retrieval Methods YANG data 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
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       |  |  |  +---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
       |  |  +---w count?                uint32
       |  |  +---w ttl?                  uint8
       |  |  +---w packet-size?          uint32
       |  +--ro output
Top   ToC   Page 9
       |     +--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
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       |     |  |  +--ro router-id?   rt:router-id
       |     |  +--ro egress-intf-name?   if:interface-ref
       |     +--ro dest-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 ingress-intf-name?   if:interface-ref
       |     +--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-loss-count?          uint32
       |     |  +--ro loss-ratio?                 percentage
       |     |  +--ro packet-reorder-count?       uint32
       |     |  +--ro packets-out-of-seq-count?   uint32
       |     |  +--ro packets-dup-count?          uint32
       |     +--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
Top   ToC   Page 12
          |  |  |     +--:(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
          |  +---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
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             |  |     +--:(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
             |  +--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)
Top   ToC   Page 14
             |  |     |  +--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
             +--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
Top   ToC   Page 15
             |  +--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?
Top   ToC   Page 16
                   |           |          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 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@2019-04-16.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;
  }
Top   ToC   Page 17
  organization
    "IETF LIME Working Group";
  contact
    "WG Web:   <https://datatracker.ietf.org/wg/lime>
     WG List:  <mailto:lmap@ietf.org>

     Deepak Kumar <dekumar@cisco.com>
     Qin Wu <bill.wu@huawei.com>
     Srihari Raghavan <rihari@cisco.com>
     Michael Wang <wangzitao@huawei.com>
     Reshad Rahman <rrahman@cisco.com>";
  description
    "This YANG module defines the RPC operations for
     connectionless OAM to be used within the 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 data model defined here to
     include protocol-specific extensions.

     Copyright (c) 2019 IETF Trust and the persons identified as
     authors of the code.  All rights reserved.

     Redistribution and use in source and binary forms, with or
     without modification, is permitted pursuant to, and subject
     to the license terms contained in, the Simplified BSD License
     set forth in Section 4.c of the IETF Trust's Legal Provisions
     Relating to IETF Documents
     (http://trustee.ietf.org/license-info).

     This version of this YANG module is part of RFC 8533; see
     the RFC itself for full legal notices.";

  revision 2019-04-16 {
    description
      "Initial revision.";
    reference
      "RFC 8533: Retrieval Methods YANG Data Model for the Management
       of Operations, Administration, and Maintenance (OAM)
       Protocols That Use Connectionless Communications";
  }

  identity protocol-id {
    description
      "This is the base identity for a generic protocol
       ID.  The protocol registry can be found at
       https://www.iana.org/protocols.";
  }
Top   ToC   Page 18
  identity protocol-id-internet {
    base protocol-id;
    description
      "Identity for Internet Protocols.";
  }

  identity protocol-id-proprietary {
    base protocol-id;
    description
      "Identity for proprietary protocols (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
      "The MPLS protocol.";
  }

  identity protocol-id-mpls-tp {
    base protocol-id;
    description
      "The MPLS-TP protocol.";
  }

  identity protocol-id-twamp {
    base protocol-id;
    description
      "The Two-Way Active Measurement Protocol (TWAMP)
       protocol.";
  }

  identity protocol-id-bier {
    base protocol-id;
    description
      "The Bit Index Explicit Replication (BIER)
       protocol.";
  }

  identity status-code {
    description
      "This is base identity for a status code.";
Top   ToC   Page 19
  }

  identity success-reach {
    base status-code;
    description
      "Indicates that the destination being verified
       is reachable (see RFC 7276).";
    reference
      "RFC 7276: An Overview of Operations, Administration, and
       Maintenance (OAM) Tools";
  }

  identity fail-reach {
    base status-code;
    description
      "Indicates that the destination being verified
       is not reachable (see RFC 7276).";
    reference
      "RFC 7276: An Overview of Operations, Administration, and
       Maintenance (OAM) Tools";
  }

  identity success-path-verification {
    base status-code;
    description
      "Indicates that the path verification is performed
       successfully (see RFC 7276).";
    reference
      "RFC 7276: An Overview of Operations, Administration, and
       Maintenance (OAM) Tools";
  }

  identity fail-path-verification {
    base status-code;
    description
      "Indicates that the path verification fails
       (see RFC 7276).";
    reference
      "RFC 7276: An Overview of Operations, Administration, and
       Maintenance (OAM) Tools";
  }

  identity status-sub-code {
    description
      "IdentityBase status-sub-code.";
  }

  identity invalid-cc {
Top   ToC   Page 20
    base status-sub-code;
    description
      "Indicates that the Continuity Check message is invalid
       (see RFC 7276).";
    reference
      "RFC 7276: An Overview of Operations, Administration, and
       Maintenance (OAM) Tools";
  }

  identity invalid-pd {
    base status-sub-code;
    description
      "Indicates that the path discovery message is invalid
       (see RFC 7276).";
    reference
      "RFC 7276: An Overview of Operations, Administration, and
       Maintenance (OAM) Tools";
  }

  identity protocol-id-meta-data {
    description
      "This is the base identity for metadata that corresponds
       to the 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 Numbers registry can be found at
       https://www.iana.org/assignments/protocol-numbers.";
  }

  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 {
Top   ToC   Page 21
      type if:interface-ref;
      mandatory true;
      description
        "Outbound interface.";
    }
    leaf vrf {
      type cl-oam:routing-instance-ref;
      description
        "Virtual Routing and Forwarding (VRF) instance.";
    }
    description
      "Grouping for RPC input parameters";
  }

  rpc continuity-check {
    if-feature "cl-oam:continuity-check";
    description
      "Continuity Check RPC operation as per RFC 7276.";
    reference
      "RFC 7276: An Overview of Operations, Administration, and
       Maintenance (OAM) Tools";
    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 count {
        type uint32 {
          range "0..4294967295" {
            description
              "The overall number of packets to be transmitted
               by the sender.  The value of the 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 {
Top   ToC   Page 22
        type uint8;
        default "255";
        description
          "Time to live (TTL) used to limit the lifetime
           of data packets transmitted in the network
           to prevent looping.  The TTL value is decremented
           for every hop that 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 the 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;
          description
            "Protocol used in the 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 metadata related to the protocol ID.
             For example, this could be the Internet Protocol
             number for standard Internet Protocols used for
             help with protocol processing.";
        }
        leaf status-code {
          type identityref {
            base status-code;
          }
          mandatory true;
          description
Top   ToC   Page 23
            "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 RFC 7276)
             or some customized status code as identified by this
             field.";
          reference
            "RFC 7276: An Overview of Operations, Administration, and
             Maintenance (OAM) Tools";
        }
        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 an invalid Continuity Check) or
             other error codes specific to the protocol under use for
             the Continuity Checks.  For example, if ICMP is the
             protocol under use, the error codes defined in RFC 4443
             can be used to specify the reasons specific to ICMP.
             This technology-specific status-sub-code can be
             defined in technology-specific models.";
          reference
            "RFC 4443: The IETF Administrative Oversight Committee
             (IAOC) Member Selection Guidelines and Process.";
        }
        description
          "Status code and status-sub-code for Continuity Check RPC
           operation.";
      }
      uses cl-oam:continuity-check-data;
    }
  }

  rpc path-discovery {
    if-feature "cl-oam:path-discovery";
    description
      "Path discovery RPC operation as per RFC 7276.";
    reference
      "RFC 7276: An Overview of Operations, Administration, and
       Maintenance (OAM) Tools";
    input {
Top   ToC   Page 24
      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 maximum number of hops that
           a packet is permitted to travel before being discarded
           by a router.  By default, the maximum 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 path discovery.  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 metadata related to the protocol ID.
             For example, this could be the Internet Protocol
             number for standard Internet Protocols used for
             help with protocol processing.";
        }
Top   ToC   Page 25
        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 an invalid Continuity Check) or
             other error codes specific to the protocol under use for
             Continuity Checks.  For example, if ICMP is the protocol
             under use, the error codes defined in RFC 4443
             can be used to specify the reasons specific to ICMP.
             This technology-specific status-sub-code can be defined
             in technology-specific models.";
          reference
            "RFC 4443: The IETF Administrative Oversight Committee
             (IAOC) Member Selection Guidelines and Process.";
        }
      }
      uses cl-oam:path-discovery-data;
    }
  }
}

<CODE ENDS>


Next Section