Deterministic Networking (DetNet) Configuration YANG Model
draft-ietf-detnet-yang-06

Document Type Active Internet-Draft (detnet WG)
Last updated 2020-06-11
Replaces draft-geng-detnet-conf-yang
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Network Working Group                                            X. Geng
Internet-Draft                                                   M. Chen
Intended status: Standards Track                     Huawei Technologies
Expires: December 13, 2020                                       Y. Ryoo
                                                                    ETRI
                                                                   Z. Li
                                                            China Mobile
                                                               R. Rahman
                                                           Cisco Systems
                                                                D. Fedyk
                                                 LabN Consulting, L.L.C.
                                                           June 11, 2020

       Deterministic Networking (DetNet) Configuration YANG Model
                       draft-ietf-detnet-yang-06

Abstract

   This document contains the specification for Deterministic Networking
   flow configuration YANG Model.  The model allows for provisioning of
   end-to-end DetNet service along the path without dependency on any
   signaling protocol.

   The YANG module defined in this document conforms to the Network
   Management Datastore Architecture (NMDA).

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

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."

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   This Internet-Draft will expire on December 13, 2020.

Copyright Notice

   Copyright (c) 2020 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.  Terminologies . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  DetNet Configuration Module . . . . . . . . . . . . . . . . .   3
     3.1.  DetNet Appliction Flow Configuration Attributes . . . . .   3
     3.2.  DetNet Service Sub-layer Configuration Attributes . . . .   3
     3.3.  DetNet Forwarding Sub-layer Configuration Attributes  . .   4
   4.  DetNet YANG Structure Considerations  . . . . . . . . . . . .   4
   5.  DetNet Configuration YANG Structures  . . . . . . . . . . . .   5
   6.  DetNet Configuration YANG Model . . . . . . . . . . . . . . .  16
   7.  An alternative DetNet YANG model  . . . . . . . . . . . . . .  34
     7.1.  Conventions . . . . . . . . . . . . . . . . . . . . . . .  35
       7.1.1.  Aggregation . . . . . . . . . . . . . . . . . . . . .  35
     7.2.  Alternative DetNet Configuration YANG . . . . . . . . . .  36
     7.3.  Alternative DetNet Configuration YANG Model . . . . . . .  50
     7.4.  Test Configuration  . . . . . . . . . . . . . . . . . . .  67
       7.4.1.  DetNet Test Configuration YANG Model  . . . . . . . .  67
       7.4.2.  DetNet Test Configuration YANG Model  . . . . . . . .  69
   8.  Open Issues . . . . . . . . . . . . . . . . . . . . . . . . .  70
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  71
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  71
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  71
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  71
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  71
     12.2.  Informative References . . . . . . . . . . . . . . . . .  72
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  74

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1.  Introduction

   DetNet (Deterministic Networking) provides a capability to carry
   specified unicast or multicast data flows for real-time applications
   with extremely low packet loss rates and assured maximum end-to-end
   delivery latency.  A description of the general background and
   concepts of DetNet can be found in [RFC8655].

   This document defines a YANG model for DetNet based on YANG data
   types and modeling language defined in [RFC6991] and [RFC7950].
   DetNet service, which is designed for describing the characteristics
   of services being provided for application flows over a network, and
   DetNet configuration, which is designed for DetNet flow path
   establishment, flow status reporting, and DetNet functions
   configuration in order to achieve end-to-end bounded latency and zero
   congestion loss, are both included in this document.

2.  Terminologies

   This documents uses the terminologies defined in [RFC8655].

3.  DetNet Configuration Module

   DetNet configuration module includes DetNet App-flow configuration,
   DetNet Service Sub-layer configuration, and DetNet Forwarding Sub-
   layer configuration.  The corresponding attributes used in different
   sub-layers are defined in Section 3.1, 3.2, 3.3 respectively.

3.1.  DetNet Appliction Flow Configuration Attributes

   DetNet application flow is responsible for mapping between
   application flows and DetNet flows at the edge node(egress/ingress
   node).  Where the application flows can be either layer 2 or layer 3
   flows.  To map a flow at the User Network Interface (UNI), the
   corresponding attributes are defined in
   [I-D.ietf-detnet-flow-information-model].

3.2.  DetNet Service Sub-layer Configuration Attributes

   DetNet service functions, e.g., DetNet tunnel initialization/
   termination and service protection, are provided in DetNet service
   sub-layer.  To support these functions, the following service
   attributes need to be configured:

   o  DetNet flow identification

   o  Service function indication, indicates which service function will
      be invoked at a DetNet edge, relay node or end station.  (DetNet

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      tunnel initialization or termination are default functions in
      DetNet service layer, so there is no need for explicit
      indication).  The corresponding arguments for service functions
      also needs to be defined.

3.3.  DetNet Forwarding Sub-layer Configuration Attributes

   As defined in [RFC8655], DetNet forwarding sub-layer optionally
   provides congestion protection for DetNet flows over paths provided
   by the underlying network.  Explicit route is another mechanism that
   is used by DetNet to avoid temporary interruptions caused by the
   convergence of routing or bridging protocols, and it is also
   implemented at the DetNet forwarding sub-layer.

   To support congestion protection and explicit route, the following
   transport layer related attributes are necessary:

   o  Traffic Specification, refers to Section 7.2 of
      [I-D.ietf-detnet-flow-information-model].  It may used for
      resource reservation, flow shaping, filtering and policing.

   o  Explicit path, existing explicit route mechanisms can be reused.
      For example, if Segment Routing (SR) tunnel is used as the
      transport tunnel, the configuration is mainly at the ingress node
      of the transport layer; if the static MPLS tunnel is used as the
      transport tunnel, the configurations need to be at every transit
      node along the path; for pure IP based transport tunnel, it's
      similar to the static MPLS case.

4.  DetNet YANG Structure Considerations

   The picture shows that the general structure of the DetNet YANG
   Model:

                     +-----------+
                     |ietf-detnet|
                     +-----+-----+
                           |
             +-------------+---------------+
             |             |               |
       +-----+-----+ +-----+-----+ +-------+------+
       | App Flows | |service s-l| |forwarding s-l|
       +-----------+ +-----------+ +--------------+

   There are three instances in DetNet YANG Model: App-flow instance,
   service sub-layer instance and forwarding sub-layer instance,
   respectively corresponding to four parts of DetNet functions defined

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   in section 3.  In each instance, there are four elements: name, in-
   segments, out-segments and operations, which means:

   o  Name: indicates the key value of the instance identification.

   o  In-segments: indicates the key value of identification, e.g.,
      Layer 2 App flow identification, Layer 3 App flow identification
      and DetNet flow identification.

   o  Out-segments: indicates the information of DetNet processing(e.g.,
      DetNet forwarding, DetNet header Encapsulation) and the mapping
      relationship to the lower sub-layer/sub-network.

   o  Operations: indicates DetNet functions, e.g., DetNet forwarding
      functions, DetNet Service functions, DetNet Resource Reservation.

   These elements are different when the technologies used for the
   specific instance is different.  So this structure is abstract, which
   allows for different technology specifics as defined in different
   data plane drafts.

5.  DetNet Configuration YANG Structures

module: ietf-detnet-config-modify
  +--rw app-flows
  |  +--rw app-flow* [name]
  |     +--rw name                      string
  |     +--ro app-id?                   uint16
  |     +--rw app-flow-bidir-congruent? boolean
  |     +--rw traffic-requirements
  |     |  +--rw min-bandwidth?                  uint64
  |     |  +--rw max-latency?                    uint32
  |     |  +--rw max-latency-variation?          uint32
  |     |  +--rw max-loss?                       uint8
  |     |  +--rw max-consecutive-loss-tolerance? uint32
  |     |  +--rw max-misordering?                uint32
  |     +--rw traffic-specification
  |     |  +--rw interval?                     uint32
  |     |  +--rw max-packets-per-interval?     uint32
  |     |  +--rw max-payload-size?             uint32
  |     |  +--rw average-packets-per-interval? uint32
  |     |  +--rw average-payload-size?         uint32
  |     +--rw in-segment
  |     |  +--rw interface?               if:interface-ref
  |     |  +--rw (data-flow-type)?
  |     |     +--:(tsn-app-flow)
  |     |     |  +--rw source-mac-address?      yang:mac-address
  |     |     |  +--rw destination-mac-address? yang:mac-address

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  |     |     |  +--rw ethertype?               eth:ethertype
  |     |     |  +--rw vlan-id?                 uint16
  |     |     |  +--rw pcp?                     uint8
  |     |     +--:(ip-app-flow)
  |     |     |  +--rw src-ip-prefix?           inet:ip-prefix
  |     |     |  +--rw dest-ip-prefix?          inet:ip-prefix
  |     |     |  +--rw next-header?             uint8
  |     |     |  +--rw traffic-class?           uint8
  |     |     |  +--rw flow-label?              inet:ipv6-flow-label
  |     |     |  +--rw source-port
  |     |     |  |  +--rw (port-range-or-operator)?
  |     |     |  |     +--:(range)
  |     |     |  |     |  +--rw lower-port  inet:port-number
  |     |     |  |     |  +--rw upper-port  inet:port-number
  |     |     |  |     +--:(operator)
  |     |     |  |        +--rw operator?   operator
  |     |     |  |        +--rw port        inet:port-number
  |     |     |  +--rw destination-port
  |     |     |  |  +--rw (port-range-or-operator)?
  |     |     |  |     +--:(range)
  |     |     |  |     |  +--rw lower-port  inet:port-number
  |     |     |  |     |  +--rw upper-port  inet:port-number
  |     |     |  |     +--:(operator)
  |     |     |  |        +--rw operator?   operator
  |     |     |  |        +--rw port        inet:port-number
  |     |     |  +--rw ipsec-spi?               ipsec-spi
  |     |     +--:(mpls-app-flow)
  |     |        +--rw (label-space)?
  |     |           +--:(context-label-space)
  |     |           |  +--rw mpls-label-stack
  |     |           |     +--rw entry* [id]
  |     |           |        +--rw id             uint8
  |     |           |        +--rw label?         rt-types:mpls-label
  |     |           |        +--rw ttl?           uint8
  |     |           |        +--rw traffic-class? uint8
  |     |           +--:(platform-label-space)
  |     |              +--rw label?                   rt-types:mpls-label
  |     +--rw out-segment
  |        +--rw (outgoing-options)
  |           +--:(ingress-proxy)
  |           |  +--rw service-sub-layer?  service-sub-layer-ref
  |           +--:(egress)
  |              +--rw (next-hop-options)
  |                 +--:(simple-next-hop)
  |                 |  +--rw mpls-header
  |                 |  |  +--rw mpls-label-stack
  |                 |  |     +--rw entry* [id]
  |                 |  |        +--rw id             uint8

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  |                 |  |        +--rw label?         rt-types:mpls-label
  |                 |  |        +--rw ttl?           uint8
  |                 |  |        +--rw traffic-class? uint8
  |                 |  +--rw outgoing-interface? if:interface-ref
  |                 +--:(next-hop-list)
  |                    +--rw next-hop-list
  |                       +--rw next-hop* [hop-index]
  |                          +--rw hop-index           uint8
  |                          +--rw mpls-header
  |                          |  +--rw mpls-label-stack
  |                          |     +--rw entry* [id]
  |                          |        +--rw id             uint8
  |                          |        +--rw label?         rt-types:mpls-label
  |                          |        +--rw ttl?           uint8
  |                          |        +--rw traffic-class? uint8
  |                          +--rw outgoing-interface? if:interface-ref
  +--rw service-sub-layer
  |  +--rw service-sub-layer-list* [name]
  |     +--rw name                    string
  |     +--ro service-id?             uint16
  |     +--rw service-rank?           uint8
  |     +--rw traffic-requirements
  |     |  +--rw min-bandwidth?                  uint64
  |     |  +--rw max-latency?                    uint32
  |     |  +--rw max-latency-variation?          uint32
  |     |  +--rw max-loss?                       uint8
  |     |  +--rw max-consecutive-loss-tolerance? uint32
  |     |  +--rw max-misordering?                uint32
  |     +--rw traffic-specification
  |     |  +--rw interval?                     uint32
  |     |  +--rw max-packets-per-interval?     uint32
  |     |  +--rw max-payload-size?             uint32
  |     |  +--rw average-packets-per-interval? uint32
  |     |  +--rw average-payload-size?         uint32
  |     +--rw service-protection
  |     |  +--rw service-protection-type? service-protection-type
  |     |  +--rw sequence-number-length?  sequence-number-field
  |     +--rw service-operation-type? service-operation-type
  |     +--rw in-segment
  |     |  +--rw (incoming-options)
  |     |     +--:(ingress-proxy)
  |     |     |  +--rw app-flow*         app-flow-ref
  |     |     +--:(detnet-service-identification)
  |     |        +--rw (detnet-flow-type)?
  |     |           +--:(ip-detnet-flow)
  |     |           |  +--rw src-ip-prefix?    inet:ip-prefix
  |     |           |  +--rw dest-ip-prefix?   inet:ip-prefix
  |     |           |  +--rw next-header?      uint8

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  |     |           |  +--rw traffic-class?    uint8
  |     |           |  +--rw flow-label?       inet:ipv6-flow-label
  |     |           |  +--rw source-port
  |     |           |  |  +--rw (port-range-or-operator)?
  |     |           |  |     +--:(range)
  |     |           |  |     |  +--rw lower-port  inet:port-number
  |     |           |  |     |  +--rw upper-port  inet:port-number
  |     |           |  |     +--:(operator)
  |     |           |  |        +--rw operator?   operator
  |     |           |  |        +--rw port        inet:port-number
  |     |           |  +--rw destination-port
  |     |           |  |  +--rw (port-range-or-operator)?
  |     |           |  |     +--:(range)
  |     |           |  |     |  +--rw lower-port  inet:port-number
  |     |           |  |     |  +--rw upper-port  inet:port-number
  |     |           |  |     +--:(operator)
  |     |           |  |        +--rw operator?   operator
  |     |           |  |        +--rw port        inet:port-number
  |     |           |  +--rw ipsec-spi?        ipsec-spi
  |     |           +--:(mpls-detnet-flow)
  |     |              +--rw (label-space)?
  |     |                 +--:(context-label-space)
  |     |                 |  +--rw mpls-label-stack
  |     |                 |     +--rw entry* [id]
  |     |                 |        +--rw id             uint8
  |     |                 |        +--rw label?         rt-types:mpls-label
  |     |                 |        +--rw ttl?           uint8
  |     |                 |        +--rw traffic-class? uint8
  |     |                 +--:(platform-label-space)
  |     |                    +--rw label?            rt-types:mpls-label
  |     +--rw out-segment
  |        +--rw (outgoing-options)
  |           +--:(egress-proxy)
  |           |  +--rw app-flow*            app-flow-ref
  |           +--:(detnet-service-output)
  |              +--rw service-output-list* [service-output-index]
  |                 +--rw service-output-index  uint8
  |                 +--rw (header-type)?
  |                 |  +--:(detnet-mpls-header)
  |                 |  |  +--rw mpls-label-stack
  |                 |  |     +--rw entry* [id]
  |                 |  |        +--rw id             uint8
  |                 |  |        +--rw label?         rt-types:mpls-label
  |                 |  |        +--rw ttl?           uint8
  |                 |  |        +--rw traffic-class? uint8
  |                 |  +--:(detnet-ip-header)
  |                 |     +--rw src-ip-address?       inet:ip-address
  |                 |     +--rw dest-ip-address?      inet:ip-address

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  |                 |     +--rw next-header?          uint8
  |                 |     +--rw traffic-class?        uint8
  |                 |     +--rw flow-label?           inet:ipv6-flow-label
  |                 |     +--rw source-port?          inet:port-number
  |                 |     +--rw destination-port?     inet:port-number
  |                 +--rw next-layer* [index]
  |                    +--rw index                 uint8
  |                    +--rw forwarding-sub-layer? forwarding-sub-layer-ref
  +--rw forwarding-sub-layer
  |  +--rw forwarding-sub-layer-list* [name]
  |     +--rw name                       string
  |     +--ro forwarding-id?             uint16
  |     +--rw traffic-requirements
  |     |  +--rw min-bandwidth?                  uint64
  |     |  +--rw max-latency?                    uint32
  |     |  +--rw max-latency-variation?          uint32
  |     |  +--rw max-loss?                       uint8
  |     |  +--rw max-consecutive-loss-tolerance? uint32
  |     |  +--rw max-misordering?                uint32
  |     +--rw traffic-specification
  |     |  +--rw interval?                     uint32
  |     |  +--rw max-packets-per-interval?     uint32
  |     |  +--rw max-payload-size?             uint32
  |     |  +--rw average-packets-per-interval? uint32
  |     |  +--rw average-payload-size?         uint32
  |     +--rw forwarding-operation-type? forwarding-operations-type
  |     +--rw in-segment
  |     |  +--rw (incoming-options)
  |     |     +--:(detnet-service-forwarding)
  |     |     |  +--rw service-sub-layer* service-sub-layer-ref
  |     |     +--:(detnet-forwarding-identification)
  |     |        +--rw interface?         if:interface-ref
  |     |        +--rw (detnet-flow-type)?
  |     |           +--:(ip-detnet-flow)
  |     |           |  +--rw src-ip-prefix?     inet:ip-prefix
  |     |           |  +--rw dest-ip-prefix?    inet:ip-prefix
  |     |           |  +--rw next-header?       uint8
  |     |           |  +--rw traffic-class?     uint8
  |     |           |  +--rw flow-label?        inet:ipv6-flow-label
  |     |           |  +--rw source-port
  |     |           |  |  +--rw (port-range-or-operator)?
  |     |           |  |     +--:(range)
  |     |           |  |     |  +--rw lower-port  inet:port-number
  |     |           |  |     |  +--rw upper-port  inet:port-number
  |     |           |  |     +--:(operator)
  |     |           |  |        +--rw operator?   operator
  |     |           |  |        +--rw port        inet:port-number
  |     |           |  +--rw destination-port

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  |     |           |  |  +--rw (port-range-or-operator)?
  |     |           |  |     +--:(range)
  |     |           |  |     |  +--rw lower-port  inet:port-number
  |     |           |  |     |  +--rw upper-port  inet:port-number
  |     |           |  |     +--:(operator)
  |     |           |  |        +--rw operator?   operator
  |     |           |  |        +--rw port        inet:port-number
  |     |           |  +--rw ipsec-spi?         ipsec-spi
  |     |           +--:(mpls-detnet-flow)
  |     |              +--rw (label-space)?
  |     |                 +--:(context-label-space)
  |     |                 |  +--rw mpls-label-stack
  |     |                 |     +--rw entry* [id]
  |     |                 |        +--rw id             uint8
  |     |                 |        +--rw label?         rt-types:mpls-label
  |     |                 |        +--rw ttl?           uint8
  |     |                 |        +--rw traffic-class? uint8
  |     |                 +--:(platform-label-space)
  |     |                    +--rw label?             rt-types:mpls-label
  |     +--rw out-segment
  |        +--rw (outgoing-options)
  |           +--:(service-operation)
  |           |  +--rw service-sub-layer*  service-sub-layer-ref
  |           +--:(detnet-forwarding-output)
  |              +--rw (next-hop-options)
  |                 +--:(simple-next-hop)
  |                 |  +--rw (header-type)?
  |                 |  |  +--:(detnet-mpls-header)
  |                 |  |  |  +--rw mpls-label-stack
  |                 |  |  |     +--rw entry* [id]
  |                 |  |  |        +--rw id             uint8
  |                 |  |  |        +--rw label?         rt-types:mpls-label
  |                 |  |  |        +--rw ttl?           uint8
  |                 |  |  |        +--rw traffic-class? uint8
  |                 |  |  +--:(detnet-ip-header)
  |                 |  |     +--rw src-ip-address?     inet:ip-address
  |                 |  |     +--rw dest-ip-address?    inet:ip-address
  |                 |  |     +--rw next-header?        uint8
  |                 |  |     +--rw traffic-class?      uint8
  |                 |  |     +--rw flow-label?         inet:ipv6-flow-label
  |                 |  |     +--rw source-port?        inet:port-number
  |                 |  |     +--rw destination-port?   inet:port-number
  |                 |  +--rw outgoing-interface? if:interface-ref
  |                 +--:(next-hop-list)
  |                    +--rw next-hop-list
  |                       +--rw next-hop* [hop-index]
  |                          +--rw hop-index           uint8
  |                          +--rw (header-type)?

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  |                          |  +--:(detnet-mpls-header)
  |                          |  |  +--rw mpls-label-stack
  |                          |  |     +--rw entry* [id]
  |                          |  |        +--rw id             uint8
  |                          |  |        +--rw label?         rt-types:mpls-label
  |                          |  |        +--rw ttl?           uint8
  |                          |  |        +--rw traffic-class? uint8
  |                          |  +--:(detnet-ip-header)
  |                          |     +--rw src-ip-address?     inet:ip-address
  |                          |     +--rw dest-ip-address?    inet:ip-address
  |                          |     +--rw next-header?        uint8
  |                          |     +--rw traffic-class?      uint8
  |                          |     +--rw flow-label?         inet:ipv6-flow-label
  |                          |     +--rw source-port?        inet:port-number
  |                          |     +--rw destination-port?   inet:port-number
  |                          +--rw outgoing-interface? if:interface-ref
  +--rw sub-network
     +--rw sub-network-list* [name]
        +--rw name  string

  grouping ip-header:
    +--rw src-ip-address?   inet:ip-address
    +--rw dest-ip-address?  inet:ip-address
    +--rw next-header?      uint8
    +--rw traffic-class?    uint8
    +--rw flow-label?       inet:ipv6-flow-label
    +--rw source-port?      inet:port-number
    +--rw destination-port? inet:port-number
  grouping l2-header:
    +--rw source-mac-address?      yang:mac-address
    +--rw destination-mac-address? yang:mac-address
    +--rw ethertype?               eth:ethertype
    +--rw vlan-id?                 uint16
    +--rw pcp?                     uint8
  grouping destination-ip-port-identification:
    +--rw destination-port
       +--rw (port-range-or-operator)?
          +--:(range)
          |  +--rw lower-port  inet:port-number
          |  +--rw upper-port  inet:port-number
          +--:(operator)
             +--rw operator?   operator
             +--rw port        inet:port-number
  grouping source-ip-port-identification:
    +--rw source-port
       +--rw (port-range-or-operator)?
          +--:(range)
          |  +--rw lower-port  inet:port-number

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          |  +--rw upper-port  inet:port-number
          +--:(operator)
             +--rw operator?   operator
             +--rw port        inet:port-number
  grouping ip-flow-identification:
    +--rw src-ip-prefix?    inet:ip-prefix
    +--rw dest-ip-prefix?   inet:ip-prefix
    +--rw next-header?      uint8
    +--rw traffic-class?    uint8
    +--rw flow-label?       inet:ipv6-flow-label
    +--rw source-port
    |  +--rw (port-range-or-operator)?
    |     +--:(range)
    |     |  +--rw lower-port  inet:port-number
    |     |  +--rw upper-port  inet:port-number
    |     +--:(operator)
    |        +--rw operator?   operator
    |        +--rw port        inet:port-number
    +--rw destination-port
    |  +--rw (port-range-or-operator)?
    |     +--:(range)
    |     |  +--rw lower-port  inet:port-number
    |     |  +--rw upper-port  inet:port-number
    |     +--:(operator)
    |        +--rw operator?   operator
    |        +--rw port        inet:port-number
    +--rw ipsec-spi?        ipsec-spi
  grouping mpls-flow-identification:
    +--rw (label-space)?
       +--:(context-label-space)
       |  +--rw mpls-label-stack
       |     +--rw entry* [id]
       |        +--rw id             uint8
       |        +--rw label?         rt-types:mpls-label
       |        +--rw ttl?           uint8
       |        +--rw traffic-class? uint8
       +--:(platform-label-space)
          +--rw label?            rt-types:mpls-label
  grouping traffic-specification:
    +--rw traffic-specification
       +--rw interval?                     uint32
       +--rw max-packets-per-interval?     uint32
       +--rw max-payload-size?             uint32
       +--rw average-packets-per-interval? uint32
       +--rw average-payload-size?         uint32
  grouping traffic-requirements:
    +--rw traffic-requirements
       +--rw min-bandwidth?                  uint64

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       +--rw max-latency?                    uint32
       +--rw max-latency-variation?          uint32
       +--rw max-loss?                       uint8
       +--rw max-consecutive-loss-tolerance? uint32
       +--rw max-misordering?                uint32
  grouping data-flow-spec:
    +--rw (data-flow-type)?
       +--:(tsn-app-flow)
       |  +--rw source-mac-address?      yang:mac-address
       |  +--rw destination-mac-address? yang:mac-address
       |  +--rw ethertype?               eth:ethertype
       |  +--rw vlan-id?                 uint16
       |  +--rw pcp?                     uint8
       +--:(ip-app-flow)
       |  +--rw src-ip-prefix?           inet:ip-prefix
       |  +--rw dest-ip-prefix?          inet:ip-prefix
       |  +--rw next-header?             uint8
       |  +--rw traffic-class?           uint8
       |  +--rw flow-label?              inet:ipv6-flow-label
       |  +--rw source-port
       |  |  +--rw (port-range-or-operator)?
       |  |     +--:(range)
       |  |     |  +--rw lower-port  inet:port-number
       |  |     |  +--rw upper-port  inet:port-number
       |  |     +--:(operator)
       |  |        +--rw operator?   operator
       |  |        +--rw port        inet:port-number
       |  +--rw destination-port
       |  |  +--rw (port-range-or-operator)?
       |  |     +--:(range)
       |  |     |  +--rw lower-port  inet:port-number
       |  |     |  +--rw upper-port  inet:port-number
       |  |     +--:(operator)
       |  |        +--rw operator?   operator
       |  |        +--rw port        inet:port-number
       |  +--rw ipsec-spi?               ipsec-spi
       +--:(mpls-app-flow)
          +--rw (label-space)?
             +--:(context-label-space)
             |  +--rw mpls-label-stack
             |     +--rw entry* [id]
             |        +--rw id             uint8
             |        +--rw label?         rt-types:mpls-label
             |        +--rw ttl?           uint8
             |        +--rw traffic-class? uint8
             +--:(platform-label-space)
                +--rw label?                   rt-types:mpls-label
  grouping detnet-flow-spec:

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    +--rw (detnet-flow-type)?
       +--:(ip-detnet-flow)
       |  +--rw src-ip-prefix?    inet:ip-prefix
       |  +--rw dest-ip-prefix?   inet:ip-prefix
       |  +--rw next-header?      uint8
       |  +--rw traffic-class?    uint8
       |  +--rw flow-label?       inet:ipv6-flow-label
       |  +--rw source-port
       |  |  +--rw (port-range-or-operator)?
       |  |     +--:(range)
       |  |     |  +--rw lower-port  inet:port-number
       |  |     |  +--rw upper-port  inet:port-number
       |  |     +--:(operator)
       |  |        +--rw operator?   operator
       |  |        +--rw port        inet:port-number
       |  +--rw destination-port
       |  |  +--rw (port-range-or-operator)?
       |  |     +--:(range)
       |  |     |  +--rw lower-port  inet:port-number
       |  |     |  +--rw upper-port  inet:port-number
       |  |     +--:(operator)
       |  |        +--rw operator?   operator
       |  |        +--rw port        inet:port-number
       |  +--rw ipsec-spi?        ipsec-spi
       +--:(mpls-detnet-flow)
          +--rw (label-space)?
             +--:(context-label-space)
             |  +--rw mpls-label-stack
             |     +--rw entry* [id]
             |        +--rw id             uint8
             |        +--rw label?         rt-types:mpls-label
             |        +--rw ttl?           uint8
             |        +--rw traffic-class? uint8
             +--:(platform-label-space)
                +--rw label?            rt-types:mpls-label
  grouping app-flows-ref:
    +--rw app-flow* app-flow-ref
  grouping service-sub-layer-ref:
    +--rw service-sub-layer* service-sub-layer-ref
  grouping forwarding-sub-layer-ref:
    +--rw forwarding-sub-layer* forwarding-sub-layer-ref
  grouping detnet-header:
    +--rw (header-type)?
       +--:(detnet-mpls-header)
       |  +--rw mpls-label-stack
       |     +--rw entry* [id]
       |        +--rw id             uint8
       |        +--rw label?         rt-types:mpls-label

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       |        +--rw ttl?           uint8
       |        +--rw traffic-class? uint8
       +--:(detnet-ip-header)
          +--rw src-ip-address?   inet:ip-address
          +--rw dest-ip-address?  inet:ip-address
          +--rw next-header?      uint8
          +--rw traffic-class?    uint8
          +--rw flow-label?       inet:ipv6-flow-label
          +--rw source-port?      inet:port-number
          +--rw destination-port? inet:port-number
  grouping detnet-app-next-hop-content:
    +--rw (next-hop-options)
       +--:(simple-next-hop)
       |  +--rw mpls-header
       |  |  +--rw mpls-label-stack
       |  |     +--rw entry* [id]
       |  |        +--rw id             uint8
       |  |        +--rw label?         rt-types:mpls-label
       |  |        +--rw ttl?           uint8
       |  |        +--rw traffic-class? uint8
       |  +--rw outgoing-interface? if:interface-ref
       +--:(next-hop-list)
          +--rw next-hop-list
             +--rw next-hop* [hop-index]
                +--rw hop-index           uint8
                +--rw mpls-header
                |  +--rw mpls-label-stack
                |     +--rw entry* [id]
                |        +--rw id             uint8
                |        +--rw label?         rt-types:mpls-label
                |        +--rw ttl?           uint8
                |        +--rw traffic-class? uint8
                +--rw outgoing-interface? if:interface-ref
  grouping detnet-forwarding-next-hop-content:
    +--rw (next-hop-options)
       +--:(simple-next-hop)
       |  +--rw (header-type)?
       |  |  +--:(detnet-mpls-header)
       |  |  |  +--rw mpls-label-stack
       |  |  |     +--rw entry* [id]
       |  |  |        +--rw id             uint8
       |  |  |        +--rw label?         rt-types:mpls-label
       |  |  |        +--rw ttl?           uint8
       |  |  |        +--rw traffic-class? uint8
       |  |  +--:(detnet-ip-header)
       |  |     +--rw src-ip-address?     inet:ip-address
       |  |     +--rw dest-ip-address?    inet:ip-address
       |  |     +--rw next-header?        uint8

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       |  |     +--rw traffic-class?      uint8
       |  |     +--rw flow-label?         inet:ipv6-flow-label
       |  |     +--rw source-port?        inet:port-number
       |  |     +--rw destination-port?   inet:port-number
       |  +--rw outgoing-interface? if:interface-ref
       +--:(next-hop-list)
          +--rw next-hop-list
             +--rw next-hop* [hop-index]
                +--rw hop-index           uint8
                +--rw (header-type)?
                |  +--:(detnet-mpls-header)
                |  |  +--rw mpls-label-stack
                |  |     +--rw entry* [id]
                |  |        +--rw id             uint8
                |  |        +--rw label?         rt-types:mpls-label
                |  |        +--rw ttl?           uint8
                |  |        +--rw traffic-class? uint8
                |  +--:(detnet-ip-header)
                |     +--rw src-ip-address?     inet:ip-address
                |     +--rw dest-ip-address?    inet:ip-address
                |     +--rw next-header?        uint8
                |     +--rw traffic-class?      uint8
                |     +--rw flow-label?         inet:ipv6-flow-label
                |     +--rw source-port?        inet:port-number
                |     +--rw destination-port?   inet:port-number
                +--rw outgoing-interface? if:interface-ref

6.  DetNet Configuration YANG Model

<CODE BEGINS>
module ietf-detnet-config-modify {
  namespace "urn:ietf:params:xml:ns:yang:ietf-detnet-config";
  prefix "ietf-detnet";

  import ietf-yang-types {
    prefix "yang";
  }

  import ietf-inet-types{
    prefix "inet";
  }

  import ietf-ethertypes {
    prefix "eth";
  }

  import ietf-routing-types {
    prefix "rt-types";

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  }

  import ietf-routing {
    prefix "rt";
  }

  import ietf-packet-fields {
    prefix "packet-fields";
  }
  import ietf-interfaces {
    prefix "if";
  }

  organization "IETF DetNet Working Group";

  contact
    "WG Web:   <http://tools.ietf.org/wg/detnet/>
     WG List:  <mailto: detnet@ietf.org>
     WG Chair: Lou Berger
                 <mailto:lberger@labn.net>

                 Janos Farkas
                 <mailto:janos.farkas@ericsson.com>

     Editor:   Xuesong Geng
                <mailto:gengxuesong@huawei.com>

     Editor:   Mach Chen
                <mailto:mach.chen@huawei.com>

     Editor:   Zhenqiang Li
                <mailto:lizhenqiang@chinamobile.com>

     Editor:   Reshad Rahman
                <mailto:rrahman@cisco.com>

     Editor:   Yeoncheol Ryoo
                <mailto:dbduscjf@etri.re.kr>";

  description
    "This YANG module describes the parameters needed
     for DetNet flow configuration and flow status
  reporting";

  revision 2020-03-04 {
    description "initial revision";
    reference "RFC XXXX: draft-ietf-detnet-yang-02";

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  }

  typedef app-flow-ref {
    type leafref {
      path "/ietf-detnet:app-flows"
         + "/ietf-detnet:app-flow"
         + "/ietf-detnet:name";
    }
  }

  typedef service-sub-layer-ref {
    type leafref {
      path "/ietf-detnet:service-sub-layer"
         + "/ietf-detnet:service-sub-layer-list"
         + "/ietf-detnet:name";
    }
  }

  typedef forwarding-sub-layer-ref {
    type leafref {
      path "/ietf-detnet:forwarding-sub-layer"
         + "/ietf-detnet:forwarding-sub-layer-list"
         + "/ietf-detnet:name";
    }
  }

  typedef sub-network-ref {
    type leafref {
      path "/ietf-detnet:sub-network"
         + "/ietf-detnet:sub-network-list"
         + "/ietf-detnet:name";
    }
  }

  typedef ipsec-spi {
    type uint32 {
      range "1..max";
    }
    description
      "SPI";
  }

  typedef service-operation-type {
    type enumeration {
      enum service-initiation {
        description
          "Operation for DetNet service sub-layer encapsulation";
      }

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      enum service-termination {
        description
          "Operation for DetNet service sub-layer decapsulation";
      }
      enum service-relay {
        description
          "Operation for DetNet service sub-layer swap";
      }
      enum non-detnet {
        description
          "No operation for DetNet service sub-layer";
      }
    }
  }

  typedef forwarding-operations-type {
    type enumeration {
      enum forward {
        description
          "Operation forward to next-hop";
      }
      enum impose-and-forward {
        description
          "Operation impose outgoing label(s) and forward to
           next-hop";
      }
      enum pop-and-forward {
        description
          "Operation pop incoming label and forward to next-hop";
      }
      enum pop-impose-and-forward {
        description
          "Operation pop incoming label, impose one or more
           outgoing label(s) and forward to next-hop";
      }
      enum swap-and-forward {
        description
          "Operation swap incoming label, with outgoing label and
           forward to next-hop";
      }
      enum pop-and-lookup {
        description
          "Operation pop incoming label and perform a lookup";
      }
    }
    description "MPLS operations types";
  }

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  typedef service-protection-type {
    type enumeration {
      enum none {
        description
          "no service protection provide";
      }
      enum replication {
        description
          "A Packet Replication Function (PRF) replicates
           DetNet flow packets and forwards them to one or
           more next hops in the DetNet domain.  The number
           of packet copies sent to each next hop is a
           DetNet flow specific parameter at the node doing
           the replication.  PRF can be implemented by an
           edge node, a relay node, or an end system";
      }
      enum elimination {
        description
          "A Packet Elimination Function (PEF) eliminates
           duplicate copies of packets to prevent excess
           packets flooding the network or duplicate
           packets being sent out of the DetNet domain.
           PEF can be implemented by an edge node, a relay
           node, or an end system.";
      }
      enum ordering {
        description
          "A Packet Ordering Function (POF) re-orders
           packets within a DetNet flow that are received
           out of order.  This function can be implemented
           by an edge node, a relay node, or an end system.";
      }
      enum elimination-ordering {
        description
          "A combination of PEF and POF that can be
           implemented by an edge node, a relay node, or
           an end system.";
      }
      enum elimination-replication {
        description
          "A combination of PEF and PRF that can be
           implemented by an edge node, a relay node, or
           an end system";
      }
      enum elimination-ordering-replicaiton {
        description
          "A combination of PEF, POF and PRF that can be
           implemented by an edge node, a relay node, or

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           an end system";
      }
    }
  }

  typedef sequence-number-generation-type {
    type enumeration {
      enum copy-from-app-flow {
        description
          "Copy the app-flow sequence number to the DetNet-flow";
      }
      enum generate-by-detnet-flow {
        description
          "Generate the sequence number by DetNet flow";
      }
    }
  }

  typedef sequence-number-field {
    type enumeration {
      enum zero-sn {
        description "there is no DetNet sequence number field.";
      }
      enum short-sn {
        description "there is 16bit DetNet sequence number field";
        value 16;
      }
      enum long-sn {
        description "there is 28bit DetNet sequence number field";
        value 28;
      }
    }
  }

  grouping ip-header {
    description
      "The IPv4/IPv6 packet header information";
    leaf src-ip-address {
      type inet:ip-address;
      description
        "The source IP address of the header";
    }
    leaf dest-ip-address {
      type inet:ip-address;
      description
        "The destination IP address of the header";
    }
    leaf next-header {

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      type uint8;
      description
        "The next header of the IPv6 header";
    }
    leaf traffic-class {
      type uint8;
      description
        "The traffic class value of the header";
    }
    leaf flow-label {
      type inet:ipv6-flow-label;
      description
        "The flow label value of the header";
    }
    leaf source-port {
      type inet:port-number;
      description
      "The source port number";
    }
    leaf destination-port {
      type inet:port-number;
      description
      "The destination port number";
    }
  }

  grouping l2-header {
    description
      "The Ethernet or TSN packet header information";
    leaf source-mac-address {
      type yang:mac-address;
      description
        "The source MAC address value of the ethernet header";
    }
    leaf destination-mac-address {
      type yang:mac-address;
      description
        "The destination MAC address value of the ethernet header";
    }
    leaf ethertype {
      type eth:ethertype;
      description
        "The ethernet packet type value of the ethernet header";
    }
    leaf vlan-id {
      type uint16;
      description
        "The Vlan value of the ethernet header";

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    }
    leaf pcp {
      type uint8;
      description
        "The priority value of the ethernet header";
    }
  }
  grouping destination-ip-port-identification {
    description
    "The TCP/UDP port(source/destination) identification information";
      container destination-port {
      uses packet-fields:port-range-or-operator;
      }
  }

  grouping source-ip-port-identification {
    description
    "The TCP/UDP port(source/destination) identification information";
      container source-port {
      uses packet-fields:port-range-or-operator;
      }
  }

  grouping ip-flow-identification {
    description
    "The IPv4/IPv6 packet header identification information";
    leaf src-ip-prefix {
      type inet:ip-prefix;
      description
      "The source IP address of the header";
    }
    leaf dest-ip-prefix {
      type inet:ip-prefix;
      description
      "The destination IP address of the header";
    }
    leaf next-header {
      type uint8;
      description
      "The next header of the IPv6 header";
    }
    leaf traffic-class {
      type uint8;
      description
      "The traffic class value of the header";
    }
    leaf flow-label {
      type inet:ipv6-flow-label;

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      description
      "The flow label value of the header";
    }
      uses source-ip-port-identification;
      uses destination-ip-port-identification;
    leaf ipsec-spi {
      type ipsec-spi;
      description "Security parameter index of SA entry";
    }
  }

  grouping mpls-flow-identification {
    description
    "The MPLS packet header identification information";
    choice label-space {
      description "";
      case context-label-space {
        uses rt-types:mpls-label-stack;
      }
      case platform-label-space {
        leaf label {
          type rt-types:mpls-label;
        }
      }
    }
  }

  grouping traffic-specification {
    container traffic-specification {
    description
      "traffic-specification specifies how the Source
       transmits packets for the flow.  This is the
       promise/request of the Source to the network.
       The network uses this traffic specification
       to allocate resources and adjust queue
       parameters in network nodes.";
    reference
      "draft-ietf-detnet-flow-information-model";
    leaf interval {
      type uint32;
        description
          "The period of time in which the traffic
           specification cannot be exceeded";
    }
    leaf max-packets-per-interval{
      type uint32;
      description
        "The maximum number of packets that the

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         source will transmit in one Interval.";
    }
    leaf max-payload-size{
      type uint32;
      description
        "The maximum payload size that the source
         will transmit.";
    }
    leaf average-packets-per-interval {
      type uint32;
      description
        "The average number of packets that the
         source will transmit in one Interval";
    }
    leaf average-payload-size {
      type uint32;
      description
        "The average payload size that the
         source will transmit.";
    }
    }
  }

  grouping traffic-requirements {
    container traffic-requirements {
      description
        "FlowRequirements: defines the attributes of the App-flow
        regarding bandwidth, latency, latency variation, loss, and
        misordering tolerance.";
      leaf min-bandwidth {
        type uint64;
        description
          "MinBandwidth is the minimum bandwidth that has to be
          guaranteed for the DetNet service.  MinBandwidth is
          specified in octets per second.";
      }
      leaf max-latency {
        type uint32;
        description
          "MaxLatency is the maximum latency from Ingress to Egress(es)
          for a single packet of the DetNet flow.  MaxLatency is
          specified as an integer number of nanoseconds";
      }
      leaf max-latency-variation {
        type uint32;
        description
          "MaxLatencyVariation is the difference between the minimum and
          the maximum end-to-end one-way latency.  MaxLatencyVariation

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          is specified as an integer number of nanoseconds.";
      }
      leaf max-loss {
        type uint8;
        description
          "MaxLoss defines the maximum Packet Loss Ratio (PLR) parameter
          for the DetNet service between the Ingress and Egress(es) of
          the DetNet domain.";
      }
      leaf max-consecutive-loss-tolerance {
        type uint32;
        description
          "Some applications have special loss requirement, such as
          MaxConsecutiveLossTolerance.  The maximum consecutive loss
          tolerance parameter describes the maximum number of
          consecutive packets whose loss can be tolerated.  The maximum
          consecutive loss tolerance can be measured for example based
          on sequence number";
      }
      leaf max-misordering {
        type uint32;
        description
          "MaxMisordering describes the tolerable maximum number of
          packets that can be received out of order.  The maximum
          allowed misordering can be measured for example based on
          sequence number.  The value zero for the maximum allowed
          misordering indicates that in order delivery is required,
          misordering cannot be tolerated.";
      }
      }
  }

  grouping data-flow-spec {
    description "app-flow identification";
    choice data-flow-type {
      case tsn-app-flow {
        uses l2-header;
      }
      case ip-app-flow {
        uses ip-flow-identification;
      }
      case mpls-app-flow {
        uses mpls-flow-identification;
      }
    }
  }
  grouping detnet-flow-spec {
    description "detnet-flow identificatioin";

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    choice detnet-flow-type {
      case ip-detnet-flow {
        uses ip-flow-identification;
      }
      case mpls-detnet-flow {
        uses mpls-flow-identification;
      }
    }
  }

  grouping app-flows-ref {
    description "incoming or outgoing app-flow reference group";
    leaf-list app-flow {
      type app-flow-ref;
      description "List of ingress or egress app-flows";
    }
  }

  grouping service-sub-layer-ref {
    description "incoming or outgoing service sub-layer reference group";
    leaf-list service-sub-layer {
      type service-sub-layer-ref;
      description
      "List of incoming or outgoing service sub-layer
       that has to aggregate or disaggregate";
    }
  }

  grouping forwarding-sub-layer-ref {
    description "incoming or outgoing forwarding sub-layer reference group";
    leaf-list forwarding-sub-layer {
      type forwarding-sub-layer-ref;
      description
      "List of incoming or outgoing forwarding sub-layer
       that has to aggregate or disaggregate";
    }
  }

  grouping detnet-header {
    description "DetNet header info for DetNet encapsulation or swap";
    choice header-type {
      case detnet-mpls-header {
        description
        "MPLS label stack for DetNet MPLS encapsulation or forwarding";
        uses rt-types:mpls-label-stack;
      }
      case detnet-ip-header {
        description

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        "IPv4/IPv6 packet header for DetNet IP encapsulation";
        uses ip-header;
      }
    }
  }

  grouping detnet-app-next-hop-content {
    description
      "Generic parameters of DetNet next hops.";
    choice next-hop-options {
      mandatory true;
      description
        "Options for next hops.
         It is expected that further cases will be added through
         augments from other modules, e.g., for recursive
         next hops.";
      case simple-next-hop {
        description
          "This case represents a simple next hop consisting of the
           next-hop address and/or outgoing interface.
           Modules for address families MUST augment this case with a
           leaf containing a next-hop address of that address
           family.";
        container mpls-header {
          description
          "MPLS label stack for DetNet MPLS encapsulation or forwarding";
          uses rt-types:mpls-label-stack;
        }
        leaf outgoing-interface {
          type if:interface-ref;
        }
      }
      case next-hop-list {
        container next-hop-list {
          description
            "Container for multiple next hops.";
          list next-hop {
            key "hop-index";
            description
              "An entry in a next-hop list.

               Modules for address families MUST augment this list
               with a leaf containing a next-hop address of that
               address family.";
            leaf hop-index {
              type uint8;
              description "";
            }

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            container mpls-header {
              description
              "MPLS label stack for DetNet MPLS encapsulation or forwarding";
              uses rt-types:mpls-label-stack;
            }
            leaf outgoing-interface {
              type if:interface-ref;
            }
          }
        }
      }
    }
  }

  grouping detnet-forwarding-next-hop-content {
    description
      "Generic parameters of DetNet next hops.";
    choice next-hop-options {
      mandatory true;
      description
        "Options for next hops.
         It is expected that further cases will be added through
         augments from other modules, e.g., for recursive
         next hops.";
      case simple-next-hop {
        description
          "This case represents a simple next hop consisting of the
           next-hop address and/or outgoing interface.
           Modules for address families MUST augment this case with a
           leaf containing a next-hop address of that address
           family.";
        uses detnet-header;
        leaf outgoing-interface {
          type if:interface-ref;
        }
      }
      case next-hop-list {
        container next-hop-list {
          description
            "Container for multiple next hops.";
          list next-hop {
            key "hop-index";
            description
              "An entry in a next-hop list.

               Modules for address families MUST augment this list
               with a leaf containing a next-hop address of that
               address family.";

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            leaf hop-index {
              type uint8;
              description "";
            }
            uses detnet-header;
            leaf outgoing-interface {
              type if:interface-ref;
            }
          }
        }
      }
    }
  }

  container app-flows {
    description
    "The DetNet app-flow configuration";
    list app-flow {
      key "name";
      description "";
      leaf name {
        type "string";
        description "The name to identify the DetNet app-flow";
      }
      leaf app-id {
        type uint16;
        config false;
        description
          "The DetNet Application ID";
      }
      leaf app-flow-bidir-congruent {
        type boolean;
        description
        "Defines the data path requirement of the App-flow whether
         it must share the same data path and physical path
         for both directions through the network,
         e.g., to provide congruent paths in the two directions.";
      }
      uses traffic-requirements;
      uses traffic-specification;
      container in-segment {
        description "app-flow identification";
        leaf interface {
          type if:interface-ref;
          description "";
        }
        uses data-flow-spec;
      }

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      container out-segment {
        description
        "ingress proxy that incoming app-flow map to detnet-flow
         and egress proxy that next-hop for outging app-flow";
        choice outgoing-options {
          mandatory true;
          description
           "";
          case ingress-proxy {
            leaf service-sub-layer {
              type service-sub-layer-ref;
            }
          }
          case egress {
            uses detnet-app-next-hop-content;
          }
        }
      }
    }
  }
  container service-sub-layer {
    description "The DetNet service sub-layer configuration";
    list service-sub-layer-list {
      key "name";
      description "";
      leaf name {
        type string;
        description "The name of the DetNet service sub-layer";
      }
      leaf service-id {
        type uint16;
        config false;
        description
          "The DetNet service ID";
      }
      leaf service-rank {
        type uint8;
        description
          "The DetNet rank for this service";
      }
      uses traffic-requirements;
      uses traffic-specification;
      container service-protection {
        leaf service-protection-type {
          type service-protection-type;
          description
          "The DetNet service protection type
           such as PRF, PEF, PEOF,PERF, and PEORF";

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        }
        leaf sequence-number-length {
          type sequence-number-field;
          description
          "sequence number filed can choice 0 bit, 16bit, 28 bit filed";
        }
      }
      leaf service-operation-type {
        type service-operation-type;
      }
      container in-segment {
        description
        "The DetNet service sub-layer inbound configuration.
         This should not be used if this service operation is initiation";
        choice incoming-options {
          mandatory true;
          description
           "";
          case ingress-proxy {
            uses app-flows-ref;
          }
          case detnet-service-identification {
            uses detnet-flow-spec;
          }
        }
      }
      container out-segment {
        description
        "The DetNet service sub-layer outbound configuration.
         This should not be used
         if this service operation is termination";
        choice outgoing-options {
          mandatory true;
          description
           "";
          case egress-proxy {
            uses app-flows-ref;
          }
          case detnet-service-output {
            //uses detnet-service-next-hop-content;
            list service-output-list {
              key "service-output-index";
              leaf service-output-index {
                type uint8;
              }
              uses detnet-header;
              list next-layer{
                key "index";

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                description "lower-layer info";
                leaf index {
                  type uint8;
                }
                leaf forwarding-sub-layer {
                  type forwarding-sub-layer-ref;
                }
              }
            }
          }
        }
      }
    }
  }
  container forwarding-sub-layer {
    description "The DetNet forwarding sub-layer configuration";
    list forwarding-sub-layer-list {
      key "name";
      description "";
      leaf name {
        type string;
        description "The name of the DetNet forwarding sub-layer";
      }
      leaf forwarding-id {
        type uint16;
        config false;
        description
          "The DetNet forwarding ID";
      }
      uses traffic-requirements;
      uses traffic-specification;
      leaf forwarding-operation-type {
        type forwarding-operations-type;
      }
      container in-segment {
        description
        "The DetNet forwarding sub-layer inbound configuration. This should not be used
         if this forwarding operation is impose-and-forward";

        choice incoming-options {
          mandatory true;
          description
           "";
          case detnet-service-forwarding {
            uses service-sub-layer-ref;
          }
          case detnet-forwarding-identification {
            leaf interface {

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              type if:interface-ref;
              description "";
            }
            uses detnet-flow-spec;
          }
        }
      }
      container out-segment {
        description
        "The DetNet forwarding sub-layer outbound configuration. This should not be used
         if this forwarding operation is pop-and-lookup";
        choice outgoing-options {
          mandatory true;
          description
           "";
          case service-operation {
            uses service-sub-layer-ref;
          }
          case detnet-forwarding-output {
            uses detnet-forwarding-next-hop-content;
          }
        }
      }
    }
  }
  container sub-network {
    description "";
    list sub-network-list {
      key "name";
      description "";
      leaf name {
        type string;
        description "";
      }
    }
  }
}
<CODE ENDS>

7.  An alternative DetNet YANG model

   This is a model that is organized by the concepts in the flow model.
   In order to align with the principles in the flow document a ground
   up model was built.  In order to illustrate this YANG model some
   example test configurations are used to validate the model.  Building
   the DetNet YANG model is not that easy because the number of
   permutations of IP/MPLS data planes with and without aggregation at
   each layer is hard to keep straight.  This model tries to follow the

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   current DetNet data plane documents and supported data planes.  The
   examples do not illustrate aggregation but the models are build for
   several levels of aggregation.

7.1.  Conventions

   This YANG model consists of three main sections: application, service
   sub-layer and forwarding sub-layer, that use a number of common
   building blocks.  Many of the building blocks are also the same as
   the first model presented in this document.  To minimize duplication,
   leaf-refs between the sections are utilized.  With a single leaf-ref
   between an application and a service sub-layer the backend code can
   relate the two instances.  The backend code can also populate a read
   only instance of a leaf-ref for the operational view so leaf-refs
   only need to be configured once for both objects.  Early versions of
   the model used leaf-refs configure mainly outside the service sub-
   layer, however this turned out being awkward because the in the
   current model of the service sub-layer presented here it is binding a
   service id to the leaf-ref.  Therefore the leaf-ref for an
   application and a forwarding sub-layer is more naturally configured
   from the service sub-layer.

   Another point about the model is each component has two
   unidirectional parts.  Applications would typically contain both
   directions and become a complete bidirectional entity containing both
   directionsl of a flow.  Service sub-layers components can be
   configured as unidirectional with only one direction being
   configured.  Forwarding sub-layer components are unidirectional.
   Leaf-refs are used for each direction even though there are cases
   where a single leaf-ref could work in a bidirctional model.  DetNet
   Services require configuarion of each undirectional flow and have
   configuration options based on the roles they play and the types of
   traffic mappings.

   DetNet Edges have application, service and forwarding configuration.
   DetNet Relays only use DetNet services sub-layer and forwarding sub-
   layer configuration.  DetNet Transit nodes may only have forwarding
   sub-layer configuration.  The behavior is DetNet service dependent,
   such that a a physical node may be an edge node for some flows, it
   may be a relay node for some flows and it may be a transit node for
   some flows.  The full YANG model is defined and only the relevant
   aspects are configured at each stage.

7.1.1.  Aggregation

   Aggregation may be configured at each of the instances.  Aggregation
   is data plane specific.  DetNet Service Sub-layer MPLS aggregation
   for example, from application to service adds a per Application

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   Service sub-layer label.  If a DetNet service is aggregated to
   another DetNet service there are a couple ways this can be
   accomplished.

   A service sub-layer can play a role similar to an application to
   another service allowing aggregation of services.  A service sub-
   layer can appear as relay service peering with that service.  Relay
   functions are dependent in the traffic type.  Aggregation can be
   achieved by encapsulation (MPLS) or by wild cards (IP) using the
   native IP header.  IP headers that are used in place aggregate by
   allowing a broader address range (wild cards) or port range or DSCP
   filter.  These aggregating flows also require the reverse operation
   to disaggregate the traffic at the edge of the DetNet service.

   There are many ways to achieve aggregation and this can complicate
   the YANG design to some degree.  The current models support
   aggregation but the configuration examples provided are illustrating
   no aggregation for this version of the draft.

7.2.  Alternative DetNet Configuration YANG

module: ietf-detnet-configa
  +--rw detnet
     +--rw applications
     |  +--rw app-list* [name]
     |  |  +--rw name                        string
     |  |  +--ro app-id?                     uint16
     |  |  +--rw app-flow-bidir-congruent?   boolean
     |  |  +--ro service-outbound?           service-ref
     |  |  +--ro service-inbound?            service-ref
     |  |  +--rw traffic-requirements
     |  |  |  +--rw min-bandwidth?                    uint64
     |  |  |  +--rw max-latency?                      uint32
     |  |  |  +--rw max-latency-variation?            uint32
     |  |  |  +--rw max-loss?                         percent
     |  |  |  +--rw max-consecutive-loss-tolerance?   uint32
     |  |  |  +--rw max-misordering?                  uint32
     |  |  +--rw traffic-specification
     |  |     +--rw interval?                   uint32
     |  |     +--rw max-packets-per-interval?   uint64
     |  |     +--rw max-payload-size?           uint32
     |  +--rw app-ingress* [name]
     |  |  +--rw name                  string
     |  |  +--ro app-flow-status?      identityref
     |  |  +--rw incoming-interface*   if:interface-ref
     |  |  +--rw (detnet-forwarding-type)?
     |  |     +--:(ethernet)
     |  |     |  +--rw ethernet

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     |  |     |     +--rw placeholder?   string
     |  |     +--:(ip)
     |  |     |  +--rw ip
     |  |     |     +--rw source             inet:ip-prefix
     |  |     |     +--rw destination        inet:ip-prefix
     |  |     |     +--rw protocol-next      uint8
     |  |     |     +--rw dscp*              uint8
     |  |     |     +--rw ipv6-flow-label?   inet:ipv6-flow-label
     |  |     |     +--rw (l4)?
     |  |     |        +--:(tcp)
     |  |     |        |  +--rw tcp
     |  |     |        |     +--rw source-port
     |  |     |        |     |  +--rw (source-port)?
     |  |     |        |     |     +--:(range-or-operator)
     |  |     |        |     |        +--rw range-or-operator
     |  |     |        |     |           +--rw (port-range-or-operator)?
     |  |     |        |     |              +--:(range)
     |  |     |        |     |              |  +--rw lower-port    inet:
port-number
     |  |     |        |     |              |  +--rw upper-port    inet:
port-number
     |  |     |        |     |              +--:(operator)
     |  |     |        |     |                 +--rw operator?     opera
tor
     |  |     |        |     |                 +--rw port          inet:
port-number
     |  |     |        |     +--rw destination-port
     |  |     |        |        +--rw (destination-port)?
     |  |     |        |           +--:(range-or-operator)
     |  |     |        |              +--rw range-or-operator
     |  |     |        |                 +--rw (port-range-or-operator)?
     |  |     |        |                    +--:(range)
     |  |     |        |                    |  +--rw lower-port    inet:
port-number
     |  |     |        |                    |  +--rw upper-port    inet:
port-number
     |  |     |        |                    +--:(operator)
     |  |     |        |                       +--rw operator?     opera
tor
     |  |     |        |                       +--rw port          inet:
port-number
     |  |     |        +--:(udp)
     |  |     |        |  +--rw udp
     |  |     |        |     +--rw source-port
     |  |     |        |     |  +--rw (source-port)?
     |  |     |        |     |     +--:(range-or-operator)
     |  |     |        |     |        +--rw range-or-operator
     |  |     |        |     |           +--rw (port-range-or-operator)?

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     |  |     |        |     |              +--:(range)
     |  |     |        |     |              |  +--rw lower-port    inet:
port-number
     |  |     |        |     |              |  +--rw upper-port    inet:
port-number
     |  |     |        |     |              +--:(operator)
     |  |     |        |     |                 +--rw operator?     opera
tor
     |  |     |        |     |                 +--rw port          inet:
port-number
     |  |     |        |     +--rw destination-port
     |  |     |        |        +--rw (destination-port)?
     |  |     |        |           +--:(range-or-operator)
     |  |     |        |              +--rw range-or-operator
     |  |     |        |                 +--rw (port-range-or-operator)?
     |  |     |        |                    +--:(range)
     |  |     |        |                    |  +--rw lower-port    inet:
port-number
     |  |     |        |                    |  +--rw upper-port    inet:
port-number
     |  |     |        |                    +--:(operator)
     |  |     |        |                       +--rw operator?     opera
tor
     |  |     |        |                       +--rw port          inet:
port-number
     |  |     |        +--:(ipsec)
     |  |     |           +--rw ipsec
     |  |     |              +--rw ipsec-spi?   ipsec-spi
     |  |     +--:(mpls)
     |  |        +--rw mpls
     |  |           +--rw (label-space)?
     |  |              +--:(interface)
     |  |              |  +--rw interface
     |  |              |     +--rw mpls-label-stack
     |  |              |        +--rw entry* [id]
     |  |              |           +--rw id               uint8
     |  |              |           +--rw label?           rt-types:mpls-
label
     |  |              |           +--rw ttl?             uint8
     |  |              |           +--rw traffic-class?   uint8
     |  |              +--:(platform)
     |  |                 +--rw platform
     |  |                    +--rw mpls-label-stack
     |  |                       +--rw entry* [id]
     |  |                          +--rw id               uint8
     |  |                          +--rw label?           rt-types:mpls-
label
     |  |                          +--rw ttl?             uint8

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     |  |                          +--rw traffic-class?   uint8
     |  +--rw app-egress* [name]
     |     +--rw name               string
     |     +--ro app-flow-status?   identityref
     |     +--rw next-hop
     |        +--rw (application-type)?
     |           +--:(ethernet)
     |           |  +--rw ethernet
     |           |     +--rw ethernet-place-holder?   string
     |           +--:(ip-mpls)
     |              +--rw ip-mpls
     |                 +--rw (next-hop-options)
     |                    +--:(simple-next-hop)
     |                    |  +--rw simple-next-hop
     |                    |     +--rw outgoing-interface?   if:interface
-ref
     |                    |     +--rw mpls-label-stack
     |                    |        +--rw entry* [id]
     |                    |           +--rw id               uint8
     |                    |           +--rw label?           rt-types:mp
ls-label
     |                    |           +--rw ttl?             uint8
     |                    |           +--rw traffic-class?   uint8
     |                    +--:(special-next-hop)
     |                    |  +--rw special-next-hop
     |                    |     +--rw special-next-hop?   enumeration
     |                    +--:(next-hop)
     |                       +--rw next-hop* [hop-index]
     |                          +--rw hop-index             uint8
     |                          +--rw outgoing-interface?   if:interface
-ref
     |                          +--rw index?                string
     |                          +--rw backup-index?         string
     |                          +--rw loadshare?            uint16
     |                          +--rw role?                 nhlfe-role
     |                          +--rw mpls-label-stack
     |                             +--rw entry* [id]
     |                                +--rw id               uint8
     |                                +--rw label?           rt-types:mp
ls-label
     |                                +--rw ttl?             uint8
     |                                +--rw traffic-class?   uint8
     +--rw services
     |  +--rw service-list* [name]
     |     +--rw name            string
     |     +--ro service-id?     uint16
     |     +--rw service-rank?   uint8
     |     +--rw outbound

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     |     |  +--ro forward-sublayer-output*   fwd-sub-layer-output-ref
     |     |  +--rw service-protection-type?   identityref
     |     |  +--rw sequence_number_length?    uint8
     |     |  +--rw application-input* [name]
     |     |  |  +--rw name                        application-ref
     |     |  |  +--rw (detnet-forwarding-type)?
     |     |  |     +--:(ip)
     |     |  |     |  +--rw ip
     |     |  |     |     +--rw source             inet:ip-prefix
     |     |  |     |     +--rw destination        inet:ip-prefix
     |     |  |     |     +--rw protocol-next      uint8
     |     |  |     |     +--rw dscp*              uint8
     |     |  |     |     +--rw ipv6-flow-label?   inet:ipv6-flow-label
     |     |  |     |     +--rw (l4)?
     |     |  |     |        +--:(tcp)
     |     |  |     |        |  +--rw tcp
     |     |  |     |        |     +--rw source-port
     |     |  |     |        |     |  +--rw (source-port)?
     |     |  |     |        |     |     +--:(range-or-operator)
     |     |  |     |        |     |        +--rw range-or-operator
     |     |  |     |        |     |           +--rw (port-range-or-oper
ator)?
     |     |  |     |        |     |              +--:(range)
     |     |  |     |        |     |              |  +--rw lower-port
 inet:port-number
     |     |  |     |        |     |              |  +--rw upper-port
 inet:port-number
     |     |  |     |        |     |              +--:(operator)
     |     |  |     |        |     |                 +--rw operator?
 operator
     |     |  |     |        |     |                 +--rw port
 inet:port-number
     |     |  |     |        |     +--rw destination-port
     |     |  |     |        |        +--rw (destination-port)?
     |     |  |     |        |           +--:(range-or-operator)
     |     |  |     |        |              +--rw range-or-operator
     |     |  |     |        |                 +--rw (port-range-or-oper
ator)?
     |     |  |     |        |                    +--:(range)
     |     |  |     |        |                    |  +--rw lower-port
 inet:port-number
     |     |  |     |        |                    |  +--rw upper-port
 inet:port-number
     |     |  |     |        |                    +--:(operator)
     |     |  |     |        |                       +--rw operator?
 operator
     |     |  |     |        |                       +--rw port
 inet:port-number

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     |     |  |     |        +--:(udp)
     |     |  |     |        |  +--rw udp
     |     |  |     |        |     +--rw source-port
     |     |  |     |        |     |  +--rw (source-port)?
     |     |  |     |        |     |     +--:(range-or-operator)
     |     |  |     |        |     |        +--rw range-or-operator
     |     |  |     |        |     |           +--rw (port-range-or-oper
ator)?
     |     |  |     |        |     |              +--:(range)
     |     |  |     |        |     |              |  +--rw lower-port
 inet:port-number
     |     |  |     |        |     |              |  +--rw upper-port
 inet:port-number
     |     |  |     |        |     |              +--:(operator)
     |     |  |     |        |     |                 +--rw operator?
 operator
     |     |  |     |        |     |                 +--rw port
 inet:port-number
     |     |  |     |        |     +--rw destination-port
     |     |  |     |        |        +--rw (destination-port)?
     |     |  |     |        |           +--:(range-or-operator)
     |     |  |     |        |              +--rw range-or-operator
     |     |  |     |        |                 +--rw (port-range-or-oper
ator)?
     |     |  |     |        |                    +--:(range)
     |     |  |     |        |                    |  +--rw lower-port
 inet:port-number
     |     |  |     |        |                    |  +--rw upper-port
 inet:port-number
     |     |  |     |        |                    +--:(operator)
     |     |  |     |        |                       +--rw operator?
 operator
     |     |  |     |        |                       +--rw port
 inet:port-number
     |     |  |     |        +--:(ipsec)
     |     |  |     |           +--rw ipsec
     |     |  |     |              +--rw ipsec-spi?   ipsec-spi
     |     |  |     +--:(mpls-service-label)
     |     |  |        +--rw mpls-service-label?   rt-types:mpls-label-g
eneral-use
     |     |  +--rw prev-relay-services* [name]
     |     |  |  +--rw name                        service-ref
     |     |  |  +--rw (detnet-forwarding-type)?
     |     |  |     +--:(ip)
     |     |  |     |  +--rw ip
     |     |  |     |     +--rw source             inet:ip-prefix
     |     |  |     |     +--rw destination        inet:ip-prefix
     |     |  |     |     +--rw protocol-next      uint8

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     |     |  |     |     +--rw dscp*              uint8
     |     |  |     |     +--rw ipv6-flow-label?   inet:ipv6-flow-label
     |     |  |     |     +--rw (l4)?
     |     |  |     |        +--:(tcp)
     |     |  |     |        |  +--rw tcp
     |     |  |     |        |     +--rw source-port
     |     |  |     |        |     |  +--rw (source-port)?
     |     |  |     |        |     |     +--:(range-or-operator)
     |     |  |     |        |     |        +--rw range-or-operator
     |     |  |     |        |     |           +--rw (port-range-or-oper
ator)?
     |     |  |     |        |     |              +--:(range)
     |     |  |     |        |     |              |  +--rw lower-port
 inet:port-number
     |     |  |     |        |     |              |  +--rw upper-port
 inet:port-number
     |     |  |     |        |     |              +--:(operator)
     |     |  |     |        |     |                 +--rw operator?
 operator
     |     |  |     |        |     |                 +--rw port
 inet:port-number
     |     |  |     |        |     +--rw destination-port
     |     |  |     |        |        +--rw (destination-port)?
     |     |  |     |        |           +--:(range-or-operator)
     |     |  |     |        |              +--rw range-or-operator
     |     |  |     |        |                 +--rw (port-range-or-oper
ator)?
     |     |  |     |        |                    +--:(range)
     |     |  |     |        |                    |  +--rw lower-port
 inet:port-number
     |     |  |     |        |                    |  +--rw upper-port
 inet:port-number
     |     |  |     |        |                    +--:(operator)
     |     |  |     |        |                       +--rw operator?
 operator
     |     |  |     |        |                       +--rw port
 inet:port-number
     |     |  |     |        +--:(udp)
     |     |  |     |        |  +--rw udp
     |     |  |     |        |     +--rw source-port
     |     |  |     |        |     |  +--rw (source-port)?
     |     |  |     |        |     |     +--:(range-or-operator)
     |     |  |     |        |     |        +--rw range-or-operator
     |     |  |     |        |     |           +--rw (port-range-or-oper
ator)?
     |     |  |     |        |     |              +--:(range)
     |     |  |     |        |     |              |  +--rw lower-port
 inet:port-number

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     |     |  |     |        |     |              |  +--rw upper-port
 inet:port-number
     |     |  |     |        |     |              +--:(operator)
     |     |  |     |        |     |                 +--rw operator?
 operator
     |     |  |     |        |     |                 +--rw port
 inet:port-number
     |     |  |     |        |     +--rw destination-port
     |     |  |     |        |        +--rw (destination-port)?
     |     |  |     |        |           +--:(range-or-operator)
     |     |  |     |        |              +--rw range-or-operator
     |     |  |     |        |                 +--rw (port-range-or-oper
ator)?
     |     |  |     |        |                    +--:(range)
     |     |  |     |        |                    |  +--rw lower-port
 inet:port-number
     |     |  |     |        |                    |  +--rw upper-port
 inet:port-number
     |     |  |     |        |                    +--:(operator)
     |     |  |     |        |                       +--rw operator?
 operator
     |     |  |     |        |                       +--rw port
 inet:port-number
     |     |  |     |        +--:(ipsec)
     |     |  |     |           +--rw ipsec
     |     |  |     |              +--rw ipsec-spi?   ipsec-spi
     |     |  |     +--:(mpls-service-label)
     |     |  |        +--rw mpls-service-label?   rt-types:mpls-label-g
eneral-use
     |     |  +--rw traffic-requirements
     |     |  |  +--rw min-bandwidth?                    uint64
     |     |  |  +--rw max-latency?                      uint32
     |     |  |  +--rw max-latency-variation?            uint32
     |     |  |  +--rw max-loss?                         percent
     |     |  |  +--rw max-consecutive-loss-tolerance?   uint32
     |     |  |  +--rw max-misordering?                  uint32
     |     |  +--rw traffic-specification
     |     |     +--rw interval?                   uint32
     |     |     +--rw max-packets-per-interval?   uint64
     |     |     +--rw max-payload-size?           uint32
     |     +--rw inbound
     |        +--rw forward-sublayer-input*    fwd-sub-layer-input-ref
     |        +--rw service-protection-type?   identityref
     |        +--rw sequence_number_length?    uint8
     |        +--rw application-output* [name]
     |        |  +--rw name                        application-ref
     |        |  +--rw (detnet-forwarding-type)?
     |        |     +--:(ip)

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     |        |     |  +--rw ip
     |        |     |     +--rw source             inet:ip-prefix
     |        |     |     +--rw destination        inet:ip-prefix
     |        |     |     +--rw protocol-next      uint8
     |        |     |     +--rw dscp*              uint8
     |        |     |     +--rw ipv6-flow-label?   inet:ipv6-flow-label
     |        |     |     +--rw (l4)?
     |        |     |        +--:(tcp)
     |        |     |        |  +--rw tcp
     |        |     |        |     +--rw source-port
     |        |     |        |     |  +--rw (source-port)?
     |        |     |        |     |     +--:(range-or-operator)
     |        |     |        |     |        +--rw range-or-operator
     |        |     |        |     |           +--rw (port-range-or-oper
ator)?
     |        |     |        |     |              +--:(range)
     |        |     |        |     |              |  +--rw lower-port
 inet:port-number
     |        |     |        |     |              |  +--rw upper-port
 inet:port-number
     |        |     |        |     |              +--:(operator)
     |        |     |        |     |                 +--rw operator?
 operator
     |        |     |        |     |                 +--rw port
 inet:port-number
     |        |     |        |     +--rw destination-port
     |        |     |        |        +--rw (destination-port)?
     |        |     |        |           +--:(range-or-operator)
     |        |     |        |              +--rw range-or-operator
     |        |     |        |                 +--rw (port-range-or-oper
ator)?
     |        |     |        |                    +--:(range)
     |        |     |        |                    |  +--rw lower-port
 inet:port-number
     |        |     |        |                    |  +--rw upper-port
 inet:port-number
     |        |     |        |                    +--:(operator)
     |        |     |        |                       +--rw operator?
 operator
     |        |     |        |                       +--rw port
 inet:port-number
     |        |     |        +--:(udp)
     |        |     |        |  +--rw udp
     |        |     |        |     +--rw source-port
     |        |     |        |     |  +--rw (source-port)?
     |        |     |        |     |     +--:(range-or-operator)
     |        |     |        |     |        +--rw range-or-operator
     |        |     |        |     |           +--rw (port-range-or-oper

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ator)?
     |        |     |        |     |              +--:(range)
     |        |     |        |     |              |  +--rw lower-port
 inet:port-number
     |        |     |        |     |              |  +--rw upper-port
 inet:port-number
     |        |     |        |     |              +--:(operator)
     |        |     |        |     |                 +--rw operator?
 operator
     |        |     |        |     |                 +--rw port
 inet:port-number
     |        |     |        |     +--rw destination-port
     |        |     |        |        +--rw (destination-port)?
     |        |     |        |           +--:(range-or-operator)
     |        |     |        |              +--rw range-or-operator
     |        |     |        |                 +--rw (port-range-or-oper
ator)?
     |        |     |        |                    +--:(range)
     |        |     |        |                    |  +--rw lower-port
 inet:port-number
     |        |     |        |                    |  +--rw upper-port
 inet:port-number
     |        |     |        |                    +--:(operator)
     |        |     |        |                       +--rw operator?
 operator
     |        |     |        |                       +--rw port
 inet:port-number
     |        |     |        +--:(ipsec)
     |        |     |           +--rw ipsec
     |        |     |              +--rw ipsec-spi?   ipsec-spi
     |        |     +--:(mpls-service-label)
     |        |        +--rw mpls-service-label?   rt-types:mpls-label-g
eneral-use
     |        +--rw next-relay-services* [name]
     |           +--rw name                        service-ref
     |           +--rw (detnet-forwarding-type)?
     |              +--:(ip)
     |              |  +--rw ip
     |              |     +--rw source             inet:ip-prefix
     |              |     +--rw destination        inet:ip-prefix
     |              |     +--rw protocol-next      uint8
     |              |     +--rw dscp*              uint8
     |              |     +--rw ipv6-flow-label?   inet:ipv6-flow-label
     |              |     +--rw (l4)?
     |              |        +--:(tcp)
     |              |        |  +--rw tcp
     |              |        |     +--rw source-port
     |              |        |     |  +--rw (source-port)?

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     |              |        |     |     +--:(range-or-operator)
     |              |        |     |        +--rw range-or-operator
     |              |        |     |           +--rw (port-range-or-oper
ator)?
     |              |        |     |              +--:(range)
     |              |        |     |              |  +--rw lower-port
 inet:port-number
     |              |        |     |              |  +--rw upper-port
 inet:port-number
     |              |        |     |              +--:(operator)
     |              |        |     |                 +--rw operator?
 operator
     |              |        |     |                 +--rw port
 inet:port-number
     |              |        |     +--rw destination-port
     |              |        |        +--rw (destination-port)?
     |              |        |           +--:(range-or-operator)
     |              |        |              +--rw range-or-operator
     |              |        |                 +--rw (port-range-or-oper
ator)?
     |              |        |                    +--:(range)
     |              |        |                    |  +--rw lower-port
 inet:port-number
     |              |        |                    |  +--rw upper-port
 inet:port-number
     |              |        |                    +--:(operator)
     |              |        |                       +--rw operator?
 operator
     |              |        |                       +--rw port
 inet:port-number
     |              |        +--:(udp)
     |              |        |  +--rw udp
     |              |        |     +--rw source-port
     |              |        |     |  +--rw (source-port)?
     |              |        |     |     +--:(range-or-operator)
     |              |        |     |        +--rw range-or-operator
     |              |        |     |           +--rw (port-range-or-oper
ator)?
     |              |        |     |              +--:(range)
     |              |        |     |              |  +--rw lower-port
 inet:port-number
     |              |        |     |              |  +--rw upper-port
 inet:port-number
     |              |        |     |              +--:(operator)
     |              |        |     |                 +--rw operator?
 operator
     |              |        |     |                 +--rw port
 inet:port-number

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     |              |        |     +--rw destination-port
     |              |        |        +--rw (destination-port)?
     |              |        |           +--:(range-or-operator)
     |              |        |              +--rw range-or-operator
     |              |        |                 +--rw (port-range-or-oper
ator)?
     |              |        |                    +--:(range)
     |              |        |                    |  +--rw lower-port
 inet:port-number
     |              |        |                    |  +--rw upper-port
 inet:port-number
     |              |        |                    +--:(operator)
     |              |        |                       +--rw operator?
 operator
     |              |        |                       +--rw port
 inet:port-number
     |              |        +--:(ipsec)
     |              |           +--rw ipsec
     |              |              +--rw ipsec-spi?   ipsec-spi
     |              +--:(mpls-service-label)
     |                 +--rw mpls-service-label?   rt-types:mpls-label-g
eneral-use
     +--rw fwd-sub-layer-input* [name]
     |  +--rw name                           string
     |  +--rw incoming-interface*            if:interface-ref
     |  +--rw (connectors)?
     |  |  +--:(service-sub-layers)
     |  |  |  +--ro service-sub-layers*      service-ref
     |  |  +--:(forwarding-sub-layers)
     |  |     +--ro forwarding-sub-layers*   fwd-sub-layer-output-ref
     |  +--rw (detnet-forwarding-type)?
     |     +--:(ip)
     |     |  +--rw ip
     |     |     +--rw source             inet:ip-prefix
     |     |     +--rw destination        inet:ip-prefix
     |     |     +--rw protocol-next      uint8
     |     |     +--rw dscp*              uint8
     |     |     +--rw ipv6-flow-label?   inet:ipv6-flow-label
     |     |     +--rw (l4)?
     |     |        +--:(tcp)
     |     |        |  +--rw tcp
     |     |        |     +--rw source-port
     |     |        |     |  +--rw (source-port)?
     |     |        |     |     +--:(range-or-operator)
     |     |        |     |        +--rw range-or-operator
     |     |        |     |           +--rw (port-range-or-operator)?
     |     |        |     |              +--:(range)
     |     |        |     |              |  +--rw lower-port    inet:por

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t-number
     |     |        |     |              |  +--rw upper-port    inet:por
t-number
     |     |        |     |              +--:(operator)
     |     |        |     |                 +--rw operator?     operator
     |     |        |     |                 +--rw port          inet:por
t-number
     |     |        |     +--rw destination-port
     |     |        |        +--rw (destination-port)?
     |     |        |           +--:(range-or-operator)
     |     |        |              +--rw range-or-operator
     |     |        |                 +--rw (port-range-or-operator)?
     |     |        |                    +--:(range)
     |     |        |                    |  +--rw lower-port    inet:por
t-number
     |     |        |                    |  +--rw upper-port    inet:por
t-number
     |     |        |                    +--:(operator)
     |     |        |                       +--rw operator?     operator
     |     |        |                       +--rw port          inet:por
t-number
     |     |        +--:(udp)
     |     |        |  +--rw udp
     |     |        |     +--rw source-port
     |     |        |     |  +--rw (source-port)?
     |     |        |     |     +--:(range-or-operator)
     |     |        |     |        +--rw range-or-operator
     |     |        |     |           +--rw (port-range-or-operator)?
     |     |        |     |              +--:(range)
     |     |        |     |              |  +--rw lower-port    inet:por
t-number
     |     |        |     |              |  +--rw upper-port    inet:por
t-number
     |     |        |     |              +--:(operator)
     |     |        |     |                 +--rw operator?     operator
     |     |        |     |                 +--rw port          inet:por
t-number
     |     |        |     +--rw destination-port
     |     |        |        +--rw (destination-port)?
     |     |        |           +--:(range-or-operator)
     |     |        |              +--rw range-or-operator
     |     |        |                 +--rw (port-range-or-operator)?
     |     |        |                    +--:(range)
     |     |        |                    |  +--rw lower-port    inet:por
t-number
     |     |        |                    |  +--rw upper-port    inet:por
t-number
     |     |        |                    +--:(operator)

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     |     |        |                       +--rw operator?     operator
     |     |        |                       +--rw port          inet:por
t-number
     |     |        +--:(ipsec)
     |     |           +--rw ipsec
     |     |              +--rw ipsec-spi?   ipsec-spi
     |     +--:(mpls)
     |        +--rw mpls
     |           +--rw (label-space)?
     |              +--:(interface)
     |              |  +--rw interface
     |              |     +--rw mpls-label-stack
     |              |        +--rw entry* [id]
     |              |           +--rw id               uint8
     |              |           +--rw label?           rt-types:mpls-lab
el
     |              |           +--rw ttl?             uint8
     |              |           +--rw traffic-class?   uint8
     |              +--:(platform)
     |                 +--rw platform
     |                    +--rw mpls-label-stack
     |                       +--rw entry* [id]
     |                          +--rw id               uint8
     |                          +--rw label?           rt-types:mpls-lab
el
     |                          +--rw ttl?             uint8
     |                          +--rw traffic-class?   uint8
     +--rw fwd-sub-layer-output* [name]
        +--rw name                     string
        +--rw connectors
        |  +--rw outbound-service*         service-ref
        |  +--rw prev-forward-sub-layer*   fwd-sub-layer-output-ref
        +--rw traffic-requirements
        |  +--rw min-bandwidth?                    uint64
        |  +--rw max-latency?                      uint32
        |  +--rw max-latency-variation?            uint32
        |  +--rw max-loss?                         percent
        |  +--rw max-consecutive-loss-tolerance?   uint32
        |  +--rw max-misordering?                  uint32
        +--rw traffic-specification
        |  +--rw interval?                   uint32
        |  +--rw max-packets-per-interval?   uint64
        |  +--rw max-payload-size?           uint32
        +--rw next-hop
           +--rw (next-hop-options)
              +--:(simple-next-hop)
              |  +--rw simple-next-hop
              |     +--rw outgoing-interface?   if:interface-ref

Geng, et al.            Expires December 13, 2020              [Page 49]
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              |     +--rw mpls-label-stack
              |        +--rw entry* [id]
              |           +--rw id               uint8
              |           +--rw label?           rt-types:mpls-label
              |           +--rw ttl?             uint8
              |           +--rw traffic-class?   uint8
              +--:(special-next-hop)
              |  +--rw special-next-hop
              |     +--rw special-next-hop?   enumeration
              +--:(next-hop)
                 +--rw next-hop* [hop-index]
                    +--rw hop-index             uint8
                    +--rw outgoing-interface?   if:interface-ref
                    +--rw index?                string
                    +--rw backup-index?         string
                    +--rw loadshare?            uint16
                    +--rw role?                 nhlfe-role
                    +--rw mpls-label-stack
                       +--rw entry* [id]
                          +--rw id               uint8
                          +--rw label?           rt-types:mpls-label
                          +--rw ttl?             uint8
                          +--rw traffic-class?   uint8

7.3.  Alternative DetNet Configuration YANG Model

 <CODE BEGINS> file "ietf-detnet-configa@2020-06-02.yang"
 module ietf-detnet-configa {
   namespace "urn:ietf:params:xml:ns:yang:ietf-detnet-configa";
   prefix "ietf-detnet";

   import ietf-inet-types{
     prefix "inet";
   }

   import ietf-routing-types {
     prefix "rt-types";
   }

   import ietf-interfaces {
     prefix "if";
   }

   import ietf-routing {
     prefix "rt";
   }

   import ietf-mpls {

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     prefix "mpls";
   }

   import ietf-packet-fields {
     prefix "packet-fields";
   }

   organization "IETF DetNet Working Group";

   contact
     "     Editor: Don Fedyk dfedyk@labn.net ";
   description
     "This YANG module describes the parameters needed
      for DetNet flow configuration and flow status reporting";

   revision 2020-06-02 {
     description "initial revision";
     reference
       "RFC XXXX: draft-ietf-detnet-flow-information-model-06";
   }

   identity status {
     description
       "Base identity from which all application-status
        actions are derived";
   }

   identity none {
     base "status";
     description
       "Application no ingress/egress";
     reference
       "draft-ietf-detnet-flow-information-model-06 Section 5.8";
   }

   identity ready {
     base "status";
     description
       "Application ingress/egress ready";
     reference
       "draft-ietf-detnet-flow-information-model-06 Section 5.8";
   }

   identity failed {
     base "status";
     description
       "Application ingres/egresss failed";
     reference

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       "draft-ietf-detnet-flow-information-model-06 Section 5.8";
   }

   identity out-of-service {
     base "status";
     description
       "Application Administratively blocked";
     reference
       "draft-ietf-detnet-flow-information-model-06 Section 5.8";
   }

   identity partial-failed {
     base "status";
     description
       "Application One or more Egress ready, and one or more Egress
       failed.  The DetNet flow can be used if the Ingress is
       Ready.";
     reference
       "draft-ietf-detnet-flow-information-model-06 Section 5.8";
   }

   typedef ipsec-spi {
     type uint32 {
       range "1..max";
     }
     description
       "SPI";
   }

   typedef application-ref {
     type leafref {
       path "/ietf-detnet:detnet/ietf-detnet:applications" +
       "/ietf-detnet:app-list/ietf-detnet:name";
     }
     description
       "This type is used by applications ingress and egress to
       refernce application.";
     }
   typedef application-ingress-ref {
     type leafref {
       path "/ietf-detnet:detnet/ietf-detnet:applications" +
       "/ietf-detnet:app-ingress/ietf-detnet:name";
     }
     description
       "This type is used by applications to reference ingress
       interfaces.";
     }

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   typedef application-egress-ref {
     type leafref {
       path "/ietf-detnet:detnet/ietf-detnet:applications" +
       "/ietf-detnet:app-egress/ietf-detnet:name";
     }
     description
       "This type is used by applications to reference egress
       interfaces.";
     }

   typedef service-ref {
     type leafref {
       path "/ietf-detnet:detnet/ietf-detnet:services" +
       "/ietf-detnet:service-list/ietf-detnet:name";
     }
     description
       "This type is used by applications and forwarding sub-layers
       data models that need to reference a configured
       service-sub-layer.";
   }

   typedef fwd-sub-layer-input-ref {
     type leafref {
       path "/ietf-detnet:detnet/ietf-detnet:fwd-sub-layer-input"
       + "/ietf-detnet:name";
     }
     description
       "This type is used by applications to reference input
       interfaces.";
   }

   typedef fwd-sub-layer-output-ref {
     type leafref {
       path "/ietf-detnet:detnet/ietf-detnet:fwd-sub-layer-output"
       + "/ietf-detnet:name";
     }
     description
       "This type is used by applications to reference output
       interfaces.";
   }

 // Service protection
   identity service-protection-type  {
     description
     "Base identity from which specific
     interface types are derived.";
   }

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   identity no-protection {
     base "service-protection-type";
     description
       "no service protection provided";
   }

   identity replication {
     base "service-protection-type";
     description
       "A Packet Replication Function (PRF) replicates DetNet flow
       packets and forwards them to one or more next hops in the
       DetNet domain.  The number of packet copies sent to each next
       hop is a DetNet flow specific parameter at the node doing the
       replication.  PRF can be implemented by an edge node, a relay
       node, or an end system";
   }

   identity elimination {
     base "service-protection-type";
     description
       "A Packet Elimination Function (PEF) eliminates duplicate
       copies of packets to prevent excess packets flooding the
       network or duplicate packets being sent out of the DetNet
       domain.  PEF can be implemented by an edge node, a relay node,
       or an end system.";
   }

   identity ordering {
     base "service-protection-type";
     description
       "A Packet Ordering Function (POF) re-orders packets within a
       DetNet flow that are received out of order.  This function can
       be implemented by an edge node, a relay node, or an end
       system.";
   }

   identity elimination-ordering {
     base "service-protection-type";
     description
       "A combination of PEF and POF that can be implemented by an
       edge node, a relay node, or an end system.";
   }

   identity elimination-replication {
     base "service-protection-type";
     description
       "A combination of PEF and PRF that can be implemented by an
       edge node, a relay node, or an end system";

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   }

   identity elimination-ordering-replication {
     base "service-protection-type";
     description
       "A combination of PEF, POF and PRF that can be implemented by
       an edge node, a relay node, or an end system";
   }
   typedef percent {
     type uint8 {
       range "0 .. 100";
     }
     description "Percentage";
   }

   grouping ip-ports {
     container source-port {
       choice source-port {
         container range-or-operator {
           uses packet-fields:port-range-or-operator;
           description
             "Source port definition from range or operator.";
         }
         description
          "Choice of source port definition using range/operator or a
          choice to support future 'case' statements, such as one
          enabling a group of source ports to be referenced.";
       }
       description
         "Source port definition.";
     }
     container destination-port {
       choice destination-port {
         container range-or-operator {
           uses packet-fields:port-range-or-operator;
           description
             "Destination port definition from range or operator.";
         }
         description
          "Choice of destination port definition using range/operator
          or a choice to support future 'case' statements, such as
          one enabling a group of source ports to be referenced.";
       }
       description
         "Destination port definition.";
       }
     }

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   grouping ip-incoming {
     description
       "The IPv4 packet header identification information";
       leaf source {
         type inet:ip-prefix;
         mandatory true;
         description "IP source address prefix";
       }
       leaf destination {
         type inet:ip-prefix;
         description "IP destination address prefix";
         mandatory true;
     }
     leaf protocol-next {
       type uint8;
       mandatory true;
       description
         "Internet Protocol number.  Refers to the protocol of the
         payload.  In IPv6, this field is known as 'next-header', and
         if extension headers are present, the protocol is present in
         the 'upper-layer' header.";
       reference
         "RFC 791: Internet Protocol
          RFC 8200: Internet Protocol, Version 6 (IPv6) Specification.";
     }
     leaf-list dscp {
       type uint8 {
         range "0 .. 64";
       }
       description
           "The DSCP field of the header";
     }
     leaf ipv6-flow-label {
       type inet:ipv6-flow-label;
       description
         "The DSCP field of the header";
     }
     choice l4 {
       container tcp {
         uses ip-ports;
       }
       container udp {
         uses ip-ports;
       }
       container ipsec {
         leaf ipsec-spi {
           type ipsec-spi;
         description

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           "Security parameter index of SA entry.";
         }
       }
     }
   } // End of ip-incoming

   grouping traffic-specification {
     container traffic-specification {
       description
         "Traffic-specification specifies how the Source transmits
         packets for the flow.  This is the promise/request of the
         Source to the network.  The network uses this traffic
         specification to allocate resources and adjust queue
         parameters in network nodes.";
       reference
         "draft-ietf-detnet-flow-information-model-06 Section 5.5";
       leaf interval {
         type uint32;
           description
             "The period of time in which the traffic specification
             cannot be exceeded";
       }
       leaf max-packets-per-interval{
         type uint64;
         units "bits";
         description
           "The maximum number of packets that the source will
           transmit in one Interval.";
       }
       leaf max-payload-size{
         type uint32;
         description
           "The maximum payload size in bytes that the source will
           transmit.";
       }
     }
   }
   grouping traffic-requirements {
     container traffic-requirements {
       description
         "FlowRequirements: defines the attributes of the App-flow
         regarding bandwidth, latency, latency variation, loss, and
         misordering tolerance.";
       reference
         "draft-ietf-detnet-flow-information-model-06 Section 5.9";
       leaf min-bandwidth {
         type uint64;
         description

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           "MinBandwidth is the minimum bandwidth that has to be
           guaranteed for the DetNet service.  MinBandwidth is
           specified in octets per second.";
       }
       leaf max-latency {
         type uint32;
         description
           "MaxLatency is the maximum latency from Ingress to
           Egress(es) for a single packet of the DetNet flow.
           MaxLatency is specified as an integer number of
           nanoseconds";
       }
       leaf max-latency-variation {
         type uint32;
         description
           "MaxLatencyVariation is the difference between the minimum
           and the maximum end-to-end one-way latency.
           MaxLatencyVariation is specified as an integer number of
           nanoseconds.";
       }
       leaf max-loss {
         type percent;
         description
           "MaxLoss defines the maximum Packet Loss Ratio (PLR)
           parameter for the DetNet service between the Ingress and
           Egress(es) of the DetNet domain.";
       }
       leaf max-consecutive-loss-tolerance {
         type uint32;
         description
           "Some applications have special loss requirement, such as
           MaxConsecutiveLossTolerance.  The maximum consecutive loss
           tolerance parameter describes the maximum number of
           consecutive packets whose loss can be tolerated.  The
           maximum consecutive loss tolerance can be measured for
           example based on sequence number";
       }
       leaf max-misordering {
         type uint32;
         description
           "MaxMisordering describes the tolerable maximum number of
           packets that can be received out of order.  The maximum
           allowed misordering can be measured for example based on
           sequence number.  The value zero for the maximum allowed
           misordering indicates that in order delivery is required,
           misordering cannot be tolerated.";
       }
     }

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   }

 // Copied from ietf-routing
   grouping next-hop-state-content {
     description
       "Generic state parameters of next hops.";
     choice next-hop-options {
       mandatory true;
       description
         "Options for next hops.

          It is expected that further cases will be added through
          augments from other modules, e.g., for recursive next
          hops.";
       container simple-next-hop {
         description
           "This case represents a simple next hop consisting of the
           next-hop address and/or outgoing interface.

            Modules for address families MUST augment this case with
            a leaf containing a next-hop address of that address
            family.";
         leaf outgoing-interface {
           type if:interface-ref;
           description
             "Name of the outgoing interface.";
         }
         uses rt-types:mpls-label-stack;
       }
       container special-next-hop {
         uses rt:special-next-hop;
       }
       list next-hop {
         key hop-index;
         description
           "An entry in a next-hop list.  Modules for address
           families MUST augment this list with a leaf containing a
           next-hop address of that address family.";
         leaf hop-index {
           type uint8;
           description "";
         }
         leaf outgoing-interface {
           type if:interface-ref;
           description
             "Name of the outgoing interface.";
         }

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         uses mpls:nhlfe-multiple-contents;
       }
     }
   }

   grouping mpls-incoming {
     description "";
     choice label-space {
       description "";
       container interface{
         description
         "MPLS label is associated with non-platform label space, all
         of the F-labels and incoming interface information was used
         for identification";
          uses rt-types:mpls-label-stack;
       } //End of non-platform-label-space
       container platform {
         description
           "MPLS label is associated with platform label space, only
           the F-label is used for identification";
         uses rt-types:mpls-label-stack;
       }
     }
   }

   grouping ip-mpls-service {
     choice detnet-forwarding-type {
       container ip {
          uses ip-incoming;
       }
       leaf mpls-service-label {
         type rt-types:mpls-label-general-use;
         description
           "A service label for DetNet sent on egress, checked on
           ingress";
       } //End of Service-Label
     } //End of detnet-forwarding-type */
   } //End of ip-mpls-service  */

   grouping ip-mpls-profile {
     choice detnet-forwarding-type {
       container ip {
          uses ip-incoming;
       }
       container mpls {
         uses mpls-incoming;
       } //End of mpls
     } //End of detnet-forwarding-type */

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   } // ip-mpls-profile  */

   grouping ip-mpls-incoming {
     leaf-list incoming-interface {
       type if:interface-ref;
       description
       "The name of the interface";
     }
     choice detnet-forwarding-type {
       description "Traffic type";
         container ip {
            description "IP encapsulation information";
              uses ip-incoming;
         }
         container mpls {
           uses mpls-incoming;
         } //End of mpls
       } //End of detnet-forwarding-type */
     } // ip-mpls-incoming  */

   grouping eth-ip-mpls-incoming {
     leaf-list incoming-interface {
       type if:interface-ref;
       description
       "The name of the interface";
     }
     choice detnet-forwarding-type {
       description "Traffic type";
         container ethernet {
           leaf placeholder {
             type string;
             description "Place holder for matching ethernet";
           }
         }
         container ip {
            description "IP encapsulation information";
              uses ip-incoming;
         }
         container mpls {
           uses mpls-incoming;
         } //End of mpls
       } //End of detnet-forwarding-type */
     } // ip-mpls-incoming  */

   grouping service-group {
     leaf service-protection-type {
       type identityref {
           base service-protection-type;

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         }
         description
           "The DetNet service protection type such as PRF, PEF,
           PEOF, PERF, and PEORF";
     }
     leaf sequence_number_length {
       type uint8 {
         range "0 | 16 | 28";
       }
       default 0;
       description
         "When the sequence number field length is 16 or 28 bits for
         a flow, the sequence number MUST be incremented by one for
         each new app-flow packet sent.  When the field length is 16
         bits, d-CW bits 4 to 15 MUST be set to zero (0).";
     }
   }

   container detnet {
     container applications {
       description
         "DetNet applications";
       list app-list {
         key "name";
         description
           "list of the DetNet configurations";
         leaf name {
           type string;
           description
             "The name to identify the DetNet configuration";
         }
         leaf app-id {
           type uint16;
           config false;
           description
             "The DetNet service ID";
           reference
           "draft-ietf-detnet-flow-information-model-06 Section 6.1";
         }
         leaf app-flow-bidir-congruent {
           type boolean;
           description
             "Defines the data path requirement of the App-flow
             whether it must share the same data path and physical
             path for both directions through the network, e.g., to
             provide congruent paths in the two directions.";
         }
         leaf service-outbound{

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           type service-ref;
           description "Binding to this applications outgoing
           service";
         }
         leaf service-inbound{
           type service-ref;
           description "Binding to this applications incoming
           service";
         }
         uses traffic-requirements;
         uses traffic-specification;
       }
       list app-ingress {
         key "name";
         description
         "Ingress DetNet application flows or a compound flow";
         leaf name {
           type string;
           description
             "Ingress DetNet application";
         }
         leaf app-flow-status {
           type identityref {
             base status;
           }
           config false;
           description "Status of ingress application flow";
         }
         uses eth-ip-mpls-incoming;
       } //End of app-ingress
       list app-egress {
         key "name";
         description
         "Ingress DetNet application flows or a compound flow";
         leaf name {
           type string;
           description
             "Ingress DetNet application";
         }
         leaf app-flow-status {
           type identityref {
             base status;
           }
           config false;
           description "Status of egress application flows";
         }
         container next-hop {
           description

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             "Route's next-hop attribute.";
           choice application-type {
             container ethernet {
               leaf ethernet-place-holder {
                 type string;
                 description "Place holder for matching ethernet";
               }
             }
             container ip-mpls {
               uses next-hop-state-content;
             }
           }
         }
       } // End of app-egress
     } // End of applications
     container services {
       description
         "DetNet services";
       list service-list {
         key "name";
         description
           "list of the DetNet configurations";
         leaf name {
           type string;
           description
             "The name to identify the DetNet configuration";
         }
         leaf service-id {
           type uint16;
           config false;
           description
             "The DetNet service ID";
         }
         leaf service-rank {
           type uint8;
           description
             "The DetNet rank for this service";
         }
         container outbound{
           leaf-list forward-sublayer-output {
             type fwd-sub-layer-output-ref;
             config false;
           }
           uses service-group;
           list application-input {
             key "name";
             description
             "list of the DetNet applications";

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             leaf name {
               type application-ref;
               description
                "List of input applications";
              }
              uses ip-mpls-service;
           }
           list prev-relay-services {
              key "name";
             description
             "list of the DetNet applications";
             leaf name {
               type service-ref;
               description
                "List of input applications";
              }
              uses ip-mpls-service;
           }
           uses traffic-requirements;
           uses traffic-specification;
         }
         container inbound{
           leaf-list forward-sublayer-input {
             type fwd-sub-layer-input-ref;
             config false;
             description
             "List of input forwarding sub-layer interfaces";
           }
           uses service-group;
           list application-output {
             key "name";
             description "";
             leaf name {
               type application-ref;
               //config false;
               description
                 "List of input applications";
             }
             uses ip-mpls-service;
           }
           list next-relay-services {
             key "name";
             description "The Next service";
             leaf name {
               type service-ref;
               description "Binding to another service";
             }
             uses ip-mpls-service;

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           }
         }
       } // End of service-list
     } // End of services

     list fwd-sub-layer-input {
       key "name";
       description
       "Incoming DetNet member flows or a compound flow
        for receiving a packet from a port";
       leaf name {
         type string;
         description
           "Incoming DetNet sub-layer name";
       }
       leaf-list incoming-interface {
         type if:interface-ref;
         description
         "The name of the interface";
       }
       choice connectors {
         list services {
           key "name";
           description "Binding to this sub-layer services";
           leaf name {
             type service-ref;
             description "Binding to this sub-layer services";
           }
           uses ip-mpls-profile;
         }
         list forwarding-sub-layers {
           key "name";
           description "Binding to  the next forwarding sub-layer ";
           leaf name {
             type fwd-sub-layer-output-ref;
             description "Binding to  the next forwarding sub-layer ";
           }
           uses ip-mpls-profile;
         }
       }
     } //End of sub-layer
     list fwd-sub-layer-output {
       key "name";
       description
       "Outgoing DetNet member flows or a compound flow
        for sending a packet to a port";
       leaf name {
         type string;

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         description
           "Outgoing DetNet sub-layer index";
       }
       container connectors {
         leaf-list outbound-service {
           type service-ref;
           description "Binding to this sub-layer services";
         }
         leaf-list prev-forward-sub-layer {
           type fwd-sub-layer-output-ref;
           description "Binding to  the next forwarding sub-layer ";
         }
       }
       uses traffic-requirements;
       uses traffic-specification;
       container next-hop {
         description
           "IPv4 packet header encapsulation information";
         uses next-hop-state-content;
       }
     } // End of out-segments
   } // End of detnet
 } // End of ietf-detnet-flow
 <CODE ENDS>

7.4.  Test Configuration

   The following XML test configuration shows some of the parameters for
   a DetNet application, service sub-layer and forwarding sub-layer.

7.4.1.  DetNet Test Configuration YANG Model

   The case illustrated is for an ingress IP application to an MPLS
   service sub-layer and MPLS forwarding sub-layer.  In this example a
   unidirectional flow is configured.  The application input traffic is
   IP.  The Service links the application "app1", the service ID, a
   service label and the outgoing forwarding sublayer "fsl1".  The
   service label is from the remote end serice for the unidirectional
   path.

 <dn:detnet
   xmlns:dn="urn:ietf:params:xml:ns:yang:ietf-detnet-configa"
   xmlns:in="urn:ietf:params:xml:ns:yang:ietf-inet-types"
   xmlns:rt="urn:ietf:params:xml:ns:yang:ietf-routing-types"
   xmlns:if="urn:ietf:params:xml:ns:yang:ietf-interfaces"
   xmlns:r="urn:ietf:params:xml:ns:yang:ietf-routing"
   xmlns:mpls="urn:ietf:params:xml:ns:yang:ietf-mpls"
   xmlns:pf="urn:ietf:params:xml:ns:yang:ietf-packet-fields">

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   <dn:applications>
     <dn:app-list>
       <dn:name>app1</dn:name>
       <dn:app-flow-bidir-congruent>false</dn:app-flow-bidir-congruent>
     </dn:app-list>
     <dn:app-ingress>
       <dn:name>port1</dn:name>
       <if:incoming-interface>eth0</if:incoming-interface>
       <dn:ip>
         <dn:source>1.1.1.1/32</dn:source>
         <dn:destination>2.2.2.2/32</dn:destination>
         <dn:protocol-next>6</dn:protocol-next>
         <dn:dscp>40</dn:dscp>
         </dn:ip>
     </dn:app-ingress>
   </dn:applications>
   <dn:services>
     <dn:service-list>
       <dn:name>ssl1</dn:name>
       <dn:service-rank>10</dn:service-rank>
       <dn:outbound>
         <dn:forward-sublayer-output>fsl1</dn:forward-sublayer-output>
         <dn:sequence_number_length>0</dn:sequence_number_length>
         <dn:application-input>
           <dn:name>app1</dn:name>
           <dn:mpls-service-label>55555</dn:mpls-service-label>
         </dn:application-input>
         <dn:traffic-requirements>
           <dn:min-bandwidth>100000000 </dn:min-bandwidth>
           <dn:max-latency>10000000</dn:max-latency>
           <dn:max-latency-variation>2000000</dn:max-latency-variation>
           <dn:max-loss>2</dn:max-loss>
           <dn:max-consecutive-loss-tolerance>5
           </dn:max-consecutive-loss-tolerance>
           <dn:max-misordering>0</dn:max-misordering>
         </dn:traffic-requirements>
         <dn:traffic-specification>
           <dn:interval>5</dn:interval>
           <dn:max-packets-per-interval>10</dn:max-packets-per-interval>
           <dn:max-payload-size>1500</dn:max-payload-size>
         </dn:traffic-specification>
       </dn:outbound>
     </dn:service-list>
   </dn:services>
   <dn:fwd-sub-layer-output>
     <dn:name>fsl1</dn:name>
     <dn:next-hop>
       <dn:next-hop>

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         <dn:hop-index>1</dn:hop-index>
         <if:outgoing-interface>eth1</if:outgoing-interface>
         <dn:mpls-label-stack>
            <dn:entry>
              <dn:id>1</dn:id>
              <dn:label>42</dn:label>
              <dn:traffic-class>5</dn:traffic-class>
            </dn:entry>
         </dn:mpls-label-stack>
       </dn:next-hop>
     </dn:next-hop>
   </dn:fwd-sub-layer-output>
 </dn:detnet>

7.4.2.  DetNet Test Configuration YANG Model

   The next case illustrated is for an egress IP application from an
   MPLS service sub-layer and MPLS forwarding sub-layer.  In this
   example a unidirectional flow is configured.  The application egress
   traffic is IP.  The Service links the application "app2", the service
   ID, a service label and the outgoing forwarding sub-layer "fsl2".
   Again the service label is relevant to this egress service.  The
   forwarding sub-layer has an mpls stack that it removes.  The next
   label can be looked up because the forwarding sub-layer has a
   reference to any DetNet services and those services have registered
   the service label such that forwarding layer can forward to the
   respective service sub-layer.  Since the service sub-layer label is
   unique to "app1" the service layer can forward the flow to the
   correct app1.  While not illustrated a single service can associated
   multiple applications with a unique service label.

  <dn:detnet
    xmlns:dn="urn:ietf:params:xml:ns:yang:ietf-detnet-configa"
    xmlns:in="urn:ietf:params:xml:ns:yang:ietf-inet-types"
    xmlns:rt="urn:ietf:params:xml:ns:yang:ietf-routing-types"
    xmlns:if="urn:ietf:params:xml:ns:yang:ietf-interfaces"
    xmlns:r="urn:ietf:params:xml:ns:yang:ietf-routing"
    xmlns:mpls="urn:ietf:params:xml:ns:yang:ietf-mpls"
    xmlns:pf="urn:ietf:params:xml:ns:yang:ietf-packet-fields">
    <dn:applications>
      <dn:app-list>
        <dn:name>app2</dn:name>
        <dn:app-flow-bidir-congruent>false</dn:app-flow-bidir-congruent>
      </dn:app-list>
      <dn:app-egress>
        <dn:name>port1</dn:name>
          <dn:ip-mpls>
          <dn:next-hop>

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            <dn:hop-index> </dn:hop-index>
            <if:outgoing-interface>eth0</if:outgoing-interface>
          </dn:next-hop>
        </dn:ip-mpls>
      </dn:app-egress>
    </dn:applications>
    <dn:services>
      <dn:service-list>
        <dn:name>ssl2</dn:name>
        <dn:service-rank>10</dn:service-rank>
        <dn:inbound>
          <dn:forward-sublayer-input>fsl2</dn:forward-sublayer-input>
          <dn:sequence_number_length>0</dn:sequence_number_length>
          <dn:application-output>
            <dn:name>app1</dn:name>
            <dn:mpls-service-label>55555</dn:mpls-service-label>
          </dn:application-output>
        </dn:inbound>
      </dn:service-list>
    </dn:services>
    <dn:fwd-sub-layer-input>
      <dn:name>fsl2</dn:name>
      <if:incomming-interface>eth1</if:incomming-interface>
      <dn:service-sub-layer>
        <dn:name>ssl2</dn:name>
      </dn:service-sub-layer>
      <dn:mpls>
        <dn:interface>
          <dn:mpls-label-stack>
            <dn:entry>
              <dn:id>1</dn:id>
              <dn:label>42</dn:label>
              <dn:traffic-class>5</dn:traffic-class>
            </dn:entry>
          </dn:mpls-label-stack>
        </dn:interface>
      </dn:mpls>
    </dn:fwd-sub-layer-input>
  </dn:detnet>

8.  Open Issues

   There are some open issues that are still under discussion:

   o  The name of 'in-segment' and 'out-segment' are still under
      discussion.  These terms are used in YANG model for MPLS, but they
      may cause confusion in DetNet.

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   o  Whether application flow should be in service sub-layer is still
      under discussion.

   o  Whether we are supposed to define a new YANG Model for DetNet as
      the current draft does, or we should augment the current YANG
      Model.

   These issues will be resolved in the following versions of the draft.

9.  IANA Considerations

   This document makes no request of IANA.

   Note to RFC Editor: this section may be removed on publication as an
   RFC.

10.  Security Considerations

   <TBD>

11.  Acknowledgements

12.  References

12.1.  Normative References

   [I-D.finn-detnet-bounded-latency]
              Finn, N., Boudec, J., Mohammadpour, E., Zhang, J., Varga,
              B., and J. Farkas, "DetNet Bounded Latency", draft-finn-
              detnet-bounded-latency-04 (work in progress), June 2019.

   [I-D.ietf-detnet-flow-information-model]
              Varga, B., Farkas, J., Cummings, R., Jiang, Y., and D.
              Fedyk, "DetNet Flow Information Model", draft-ietf-detnet-
              flow-information-model-10 (work in progress), May 2020.

   [I-D.ietf-detnet-ip]
              Varga, B., Farkas, J., Berger, L., Fedyk, D., and S.
              Bryant, "DetNet Data Plane: IP", draft-ietf-detnet-ip-06
              (work in progress), April 2020.

   [I-D.ietf-detnet-mpls]
              Varga, B., Farkas, J., Berger, L., Malis, A., Bryant, S.,
              and J. Korhonen, "DetNet Data Plane: MPLS", draft-ietf-
              detnet-mpls-06 (work in progress), April 2020.

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   [I-D.ietf-detnet-topology-yang]
              Geng, X., Chen, M., Li, Z., and R. Rahman, "Deterministic
              Networking (DetNet) Topology YANG Model", draft-ietf-
              detnet-topology-yang-00 (work in progress), January 2019.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC6991]  Schoenwaelder, J., Ed., "Common YANG Data Types",
              RFC 6991, DOI 10.17487/RFC6991, July 2013,
              <https://www.rfc-editor.org/info/rfc6991>.

   [RFC7950]  Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
              RFC 7950, DOI 10.17487/RFC7950, August 2016,
              <https://www.rfc-editor.org/info/rfc7950>.

   [RFC8655]  Finn, N., Thubert, P., Varga, B., and J. Farkas,
              "Deterministic Networking Architecture", RFC 8655,
              DOI 10.17487/RFC8655, October 2019,
              <https://www.rfc-editor.org/info/rfc8655>.

12.2.  Informative References

   [I-D.geng-detnet-info-distribution]
              Geng, X., Chen, M., Li, Z., Qin, F., and L. Qiang, "IGP-TE
              Extensions for DetNet Information Distribution", draft-
              geng-detnet-info-distribution-04 (work in progress), July
              2019.

   [I-D.ietf-detnet-use-cases]
              Grossman, E., "Deterministic Networking Use Cases", draft-
              ietf-detnet-use-cases-20 (work in progress), December
              2018.

   [I-D.ietf-teas-yang-te]
              Saad, T., Gandhi, R., Liu, X., Beeram, V., and I. Bryskin,
              "A YANG Data Model for Traffic Engineering Tunnels and
              Interfaces", draft-ietf-teas-yang-te-23 (work in
              progress), March 2020.

   [I-D.ietf-teas-yang-te-topo]
              Liu, X., Bryskin, I., Beeram, V., Saad, T., Shah, H., and
              O. Dios, "YANG Data Model for Traffic Engineering (TE)
              Topologies", draft-ietf-teas-yang-te-topo-22 (work in
              progress), June 2019.

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   [I-D.thubert-tsvwg-detnet-transport]
              Thubert, P., "A Transport Layer for Deterministic
              Networks", draft-thubert-tsvwg-detnet-transport-01 (work
              in progress), October 2017.

   [I-D.varga-detnet-service-model]
              Varga, B. and J. Farkas, "DetNet Service Model", draft-
              varga-detnet-service-model-02 (work in progress), May
              2017.

   [IEEE802.1CB]
              IEEE, "IEEE, "Frame Replication and Elimination for
              Reliability (IEEE Draft P802.1CB)", 2017,
              <http://www.ieee802.org/1/files/private/cb-drafts/>.",
              2016.

   [IEEE802.1Q-2014]
              "IEEE, "IEEE Std 802.1Q Bridges and Bridged Networks",
              2014, <http://ieeexplore.ieee.org/document/6991462/>.",
              2014.

   [IEEE802.1Qbu]
              IEEE, "IEEE, "IEEE Std 802.1Qbu Bridges and Bridged
              Networks - Amendment 26: Frame Preemption", 2016,
              <http://ieeexplore.ieee.org/document/7553415/>.", 2016.

   [IEEE802.1Qbv]
              "IEEE, "IEEE Std 802.1Qbu Bridges and Bridged Networks -
              Amendment 25: Enhancements for Scheduled Traffic", 2015,
              <http://ieeexplore.ieee.org/document/7572858/>.", 2016.

   [IEEE802.1Qcc]
              IEEE, "IEEE, "Stream Reservation Protocol (SRP)
              Enhancements and Performance Improvements (IEEE Draft
              P802.1Qcc)", 2017,
              <http://www.ieee802.org/1/files/private/cc-drafts/>.".

   [IEEE802.1Qch]
              IEEE, "IEEE, "Cyclic Queuing and Forwarding (IEEE Draft
              P802.1Qch)", 2017,
              <http://www.ieee802.org/1/files/private/ch-drafts/>.",
              2016.

   [IEEE802.1Qci]
              IEEE, "IEEE, "Per-Stream Filtering and Policing (IEEE
              Draft P802.1Qci)", 2016,
              <http://www.ieee802.org/1/files/private/ci-drafts/>.",
              2016.

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   [RFC3209]  Awduche, D., Berger, L., Gan, D., Li, T., Srinivasan, V.,
              and G. Swallow, "RSVP-TE: Extensions to RSVP for LSP
              Tunnels", RFC 3209, DOI 10.17487/RFC3209, December 2001,
              <https://www.rfc-editor.org/info/rfc3209>.

   [RFC4875]  Aggarwal, R., Ed., Papadimitriou, D., Ed., and S.
              Yasukawa, Ed., "Extensions to Resource Reservation
              Protocol - Traffic Engineering (RSVP-TE) for Point-to-
              Multipoint TE Label Switched Paths (LSPs)", RFC 4875,
              DOI 10.17487/RFC4875, May 2007,
              <https://www.rfc-editor.org/info/rfc4875>.

   [RFC8342]  Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K.,
              and R. Wilton, "Network Management Datastore Architecture
              (NMDA)", RFC 8342, DOI 10.17487/RFC8342, March 2018,
              <https://www.rfc-editor.org/info/rfc8342>.

Authors' Addresses

   Xuesong Geng
   Huawei Technologies

   Email: gengxuesong@huawei.com

   Mach(Guoyi) Chen
   Huawei Technologies

   Email: mach.chen@huawei.com

   Yeoncheol Ryoo
   ETRI

   Email: dbduscjf@etri.re.kr

   Zhenqiang Li
   China Mobile

   Email: lizhenqiang@chinamobile.com

   Reshad Rahman
   Cisco Systems

   Email: rrahman@cisco.com

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   Don Fedyk
   LabN Consulting, L.L.C.

   Email: dfedyk@labn.net

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