Network Working Group                                            X. Geng
Internet-Draft                                                   M. Chen
Intended status: Standards Track                     Huawei Technologies
Expires: May 20, August 22, 2021                                         Y. Ryoo
                                                                    ETRI
                                                                D. Fedyk
                                                 LabN Consulting, L.L.C.
                                                               R. Rahman
                                                              Individual
                                                                   Z. Li
                                                            China Mobile
                                                       November 16, 2020
                                                       February 18, 2021

              Deterministic Networking (DetNet) Configuration YANG Model
                       draft-ietf-detnet-yang-09
                       draft-ietf-detnet-yang-10

Abstract

   This document contains the specification for the Deterministic
   Networking
   flow configuration YANG Model. Model for configuration and operational data for
   DetNet Flows.  The model allows for provisioning of end-to-end DetNet
   service along the path without dependency on any signaling protocol.
   It also specifies operational status for flows.

   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
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."
   This Internet-Draft will expire on May 20, August 22, 2021.

Copyright Notice

   Copyright (c) 2020 2021 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminologies  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  DetNet Configuration YANG Module  . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  DetNet Appliction Application Flow Configuration YANG Attributes . . . . . . . . .   3
     3.2.  DetNet Service Sub-layer Configuration YANG Attributes  . . . . . . . .   3
     3.3.  DetNet Forwarding Sub-layer Configuration YANG Attributes . . . . . . .   4
   4.  DetNet Flow Aggregation . . . . . . . . . . . . . . . . . . .   4
   5.  DetNet YANG Structure Considerations  . . . . . . . . . . . .   5
   6.  DetNet Configuration YANG Structures  . . . . . . . . . . . .   6
   7.  DetNet Configuration YANG Model . . . . . . . . . . . . . . .  14  15
   8.  Open Issues . . . . . . . . . . . . . . . . . . . . . . . . .  40  41
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  40  41
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  40  42
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  40  42
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  40  42
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  40  42
     12.2.  Informative References . . . . . . . . . . . . . . . . .  41  42
   Appendix A.  Examples . . . . . . . . . . . . . . . . . . . . . .  41  42
     A.1.  Example JSON Configuration  . . Configuration/Operational  . . . . . . . . . . . . .  41  43
     A.2.  Example XML Config: Aggregation using a Forwarding
           Sublayer  . . . . . . . . . . . . . . . . . . . . . . . .  45  47
     A.3.  Example JSON Service Aggregation Configuration  . . . . .  49  51
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  55  57

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  Terminology

   This documents document uses the terminologies terminology defined in [RFC8655].

3.  DetNet Configuration YANG Module

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

3.1.  DetNet Appliction Application Flow Configuration YANG Attributes

   DetNet application flow is responsible for mapping between
   application flows and DetNet flows at the edge node(egress/ingress
   node).  Where  The 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 YANG Attributes

   DetNet service functions, e.g., DetNet tunnel initialization/
   termination and service protection, are provided in the 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
      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 YANG 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  Flow Specification and Traffic Specification, Requirements, refers to Section 7.2 of
      [I-D.ietf-detnet-flow-information-model].  It  These may used for
      resource reservation, flow shaping, filtering and policing. policing by a
      control plane or other network management and control mechanisms.

   o  Explicit path,  Since this model programs the data plane 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  If a static MPLS tunnel is used as the
      transport tunnel, the configurations configuration need to be at every transit
      node along the path; for pure path.  For an IP based transport tunnel, it's path, the static
      configuration is similar to the static MPLS case.  This document
      provides data-plane configuration of IP addresses or MPLS labels
      but it does not provide control plane mapping mapping or other
      aspects.

4.  DetNet Flow Aggregation

   DetNet provides the capability of flow aggregation to improve
   scaleability of DetNet data, management and control planes.
   Aggregated flows can be viewed by the some DetNet nodes as individual
   DetNet flows.  When aggregating DetNet flows, the flows should be
   compatible: if bandwidth reservations are used, the reservation
   should be a reasonable representation of the individual reservations;
   if maximum delay bounds are used, the system should ensure that the
   aggregate does not exceed the delay bounds of the individual flows.

   The DetNet YANG model defined in this document supports DetNet flow
   aggregation with the following functions:

   o  Aggregation flow encapsulation/decapsulation/identification

   o  Mapping individual DetNet flows to an aggregated flow

   o  Changing traffic specification parameters for aggregated flow

   The following cases of DetNet aggregation are supported:

   o  aggregate data  Ingress node aggregates App flows into an application which is then mapped to a service sub-layer at the ingress node.  Note the data flows may be
      other of
      DetNet flows. flow

   o  map each  In ingress node, the service sub-layers of DetNet application to flows are
      aggregated into a single service forwarding sub-layer and
      allowing the aggregation of multiple applications at the

   o  In ingress node, and vice versa for de-aggregation.  A classifier may be
      required to de-aggregate the respective applications.

   o  map each service sub-layers of DetNet application uniquely to flows are
      aggregated into a single service sub-layer
      where those of an aggregated DetNet flow

   o  Relay node aggregates the forwarding sub-layers may be encapsulated as DetNet flows into
      a single service forwarding sub-layer and hence aggregating the applications at the ingress
      node, and vice versa for de-aggregation.  In this case,

   o  Relay node aggregates the service sub-layers of DetNet flows into
      a forwarding sub-layer identifier may be sufficient to identify the
      application.  A classifier may be required to de-aggregate the
      service sub-layers.

   o  aggregate DetNet  Relay node aggregates the service sub-layers of DetNet flows into an aggregated
      a service sub-layer of Aggregated DetNet flow by
      using

   o  Relay node aggregates the same forwarding sub-layers of DetNet flow
      into a service sub-layer at ingress node or relay node,
      and vice versa for de-aggregation. of Aggregated DetNet flow

   o  aggregate  Transit node aggregates the forwarding sub-layers of DetNet flows with different forwarding sub-layer
      into an
      aggregated flow by using the same a forwarding sub-layer at transit
      node, and vice versa for de-aggregation.

   Traffic requirements and traffic specification may be tracked for
   individual or aggregate flows but reserving resources and tracking
   the services in the aggregated flow is out of scope.

5.  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|            |
       +-----+-----+ +-----+-----+ +-------+------+            |
             |             |               |                   |
       +-----+-----+ +-----+-----+ +-------+------+   +--------+-------+
       | Ref to TR | | Ref to TR | |  Ref to TR   |   | Traffic Profile|
       +-----------+ +-----------+ +--------------+   +----------------+

   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
   in section 3.

6.  DetNet Configuration YANG Structures

module: ietf-detnet
  +--rw detnet
     +--rw traffic-profile* [profile-name]
     |  +--rw profile-name            string
     |  +--rw traffic-requirements
     |  |  +--rw min-bandwidth?                    uint64
     |  |  +--rw max-latency?                      uint32
     |  |  +--rw max-latency-variation?            uint32
     |  |  +--rw max-loss?                         uint32
     |  |  +--rw max-consecutive-loss-tolerance?   uint32
     |  |  +--rw max-misordering?                  uint32
     |  +--rw traffic-specification flow-spec
     |  |  +--rw interval?                uint32
     |  |  +--rw max-packets-per-interval? max-pkts-per-interval?   uint32
     |  |  +--rw max-payload-size?        uint32
     |  |  +--rw average-packets-per-interval? min-payload-size?        uint32
     |  |  +--rw average-payload-size? min-pkts-per-interval?   uint32
     |  +--ro member-applications* member-apps*            app-flow-ref
     |  +--ro member-services*        service-sub-layer-ref
     |  +--ro member-forwarding-sublayers* member-fwd-sublayers*   forwarding-sub-layer-ref
     +--rw app-flows
     |  +--rw app-flow* [name]
     |     +--rw name                        string
     |     +--rw app-flow-bidir-congruent?   boolean
     |     +--ro outgoing-service?           service-sub-layer-ref
     |     +--ro incoming-service?           service-sub-layer-ref
     |     +--rw traffic-profile?            traffic-profile-ref
     |     +--rw ingress
     |     |  +--rw name?                  string
     |     |  +--ro app-flow-status?       identityref
     |     |  +--rw interface?             if:interface-ref
     |     |  +--rw (data-flow-type)?
     |     |     +--:(tsn-app-flow)
     |     |     |  +--rw tsn-app-flow
     |     |     |     +--rw source-mac-address?
     |     |     |     |       yang:mac-address
     |     |     |     +--rw destination-mac-address?
     |     |     |     |       yang:mac-address
     |     |     |     +--rw ethertype?
     |     |     |     |       ethertypes:ethertype
     |     |     |     +--rw vlan-id?
     |     |     |     |       dot1q-types:vlanid
     |     |     |     +--rw pcp?                       uint8
     |     |     |             dot1q-types:priority-type
     |     |     +--:(ip-app-flow)
     |     |     |  +--rw ip-app-flow
     |     |     |     +--rw src-ip-prefix?          inet:ip-prefix
     |     |     |     +--rw dest-ip-prefix?         inet:ip-prefix
     |     |     |     +--rw next-header? protocol-next-header?   uint8
     |     |     |     +--rw traffic-class?             uint8 dscp?                   inet:dscp
     |     |     |     +--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 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 egress
     |        +--rw name?             string
     |        +--rw (application-type)?
     |           +--:(Ethernet)           +--:(ethernet)
     |           |  +--rw Ethernet ethernet
     |           |     +--rw Ethernet-place-holder?   string interface?   if:interface-ref
     |           +--:(ip-mpls)
     |              +--rw ip-mpls
     |                 +--rw (next-hop-options)
     |                    +--:(simple-next-hop)
     |                    |  +--rw outgoing-interface?
     |                    |  |       if:interface-ref
     |                    |  +--rw (flow-type)?
     |                    |     +--:(ip)
     |                    |     |  +--rw next-hop-address?
     |                    |     |          inet:ip-address
     |                    |     +--:(mpls)
     |                    |        +--rw mpls-label-stack
     |                    |           +--rw entry* [id]
     |                    |              +--rw id               uint8
     |                    |              +--rw label?
     |                    |              |       rt-types:mpls-label
     |                    |              +--rw ttl?             uint8
     |                    |              +--rw traffic-class?   uint8
     |                    +--:(next-hop-list)
     |                       +--rw next-hop-list
      |                          +--rw next-hop* [hop-index]
     |                          +--rw hop-index
      |                             |                 uint8
     |                          +--rw outgoing-interface?
     |                          |       if:interface-ref
     |                          +--rw (flow-type)?
     |                             +--:(ip)
     |                             |  +--rw next-hop-address?
     |                             |          inet:ip-address
     |                             +--:(mpls)
     |                                +--rw mpls-label-stack
     |                                   +--rw entry* [id]
     |                                      +--rw id
     |                                      |       uint8
     |                                      +--rw label?
     |                                      |       rt-types:
      |                                         |       mpls-label       rt-types:mpls-label
     |                                      +--rw ttl?
     |                                      |       uint8
     |                                      +--rw traffic-class?
     |                                              uint8
     +--rw service-sub-layer
     |  +--rw service-sub-layer-list* [name]
     |     +--rw name                      string
     |     +--rw service-rank?             uint8
     |     +--rw traffic-profile?          traffic-profile-ref
     |     +--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 incoming-type
     |     |  +--rw (incoming-type)
     |     |     +--:(app-flow)
     |     |     |  +--rw app-flow
     |     |     |     +--rw flow-list* app-flow-list*   app-flow-ref
     |     |     +--:(service)     +--:(service-aggregation)
     |     |     |  +--rw service service-aggregation
     |     |     |     +--rw service-sub-layer*
     |     |     |             service-sub-layer-ref
     |     |     +--:(forwarding)     +--:(forwarding-aggregation)
     |     |     |  +--rw forwarding forwarding-aggregation
     |     |     |     +--rw forwarding-sub-layer*
     |     |     |             forwarding-sub-layer-ref
     |     |     +--:(service-identification)     +--:(service-id)
     |     |        +--rw service-identification service-id
     |     |           +--rw (detnet-flow-type)?
     |     |              +--:(ip-detnet-flow)
     |     |              |  +--rw src-ip-prefix?
     |     |              |  |       inet:ip-prefix
     |     |              |  +--rw dest-ip-prefix?
     |     |              |  |       inet:ip-prefix
     |     |              |  +--rw next-header? protocol-next-header?     uint8
     |     |              |  +--rw traffic-class?            uint8 dscp?                     inet:dscp
     |     |              |  +--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 outgoing-type
     |        +--rw (outgoing-type)
     |           +--:(forwarding-sub-layer)
     |           |  +--rw forwarding-sub-layer
     |           |     +--rw service-outgoing-list*
     |           |             [service-outgoing-index]
     |           |        +--rw service-outgoing-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? protocol-next-header?   uint8
     |           |        |     +--rw traffic-class?      uint8 dscp?
     |           |        |     |       inet:dscp
     |           |        |     +--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*
     |           |                forwarding-sub-layer-ref
     |           +--:(service-sub-layer)
     |           |  +--rw service-sub-layer
     |           |     +--rw aggregation-service-sub-layer?
     |           |     |       service-sub-layer-ref
     |           |     +--rw service-label
     |           |        +--rw mpls-label-stack
     |           |           +--rw entry* [id]
     |           |              +--rw id               uint8
     |           |              +--rw label?
     |           |              |       rt-types:mpls-label
     |           |              +--rw ttl?             uint8
     |           |              +--rw traffic-class?   uint8
     |           +--:(upper-app-flow)           +--:(app-flow)
     |           |  +--rw upper-app-flow app-flow
     |           |     +--rw flow-list* app-flow-list*   app-flow-ref
     |           +--:(upper-service-sub-layer)           +--:(service-disaggregation)
     |           |  +--rw upper-service-sub-layer service-disaggregation
     |           |     +--rw service-sub-layer*
     |           |             service-sub-layer-ref
     |           +--:(upper-forwarding-sub-layer)           +--:(forwarding-disaggregation)
     |              +--rw upper-forwarding-sub-layer forwarding-disaggregation
     |                 +--rw forwarding-sub-layer*
     |                         forwarding-sub-layer-ref
     +--rw forwarding-sub-layer
        +--rw forwarding-sub-layer-list* [name]
           +--rw name                         string
           +--rw traffic-profile?             traffic-profile-ref
           +--rw forwarding-operation-type?
           |       forwarding-operations-type
           +--rw incoming-type
           |  +--rw (incoming-type)
           |     +--:(service-sub-layer)
           |     |  +--rw service-sub-layer
           |     |     +--ro sub-layer-list*     +--rw service-sub-layer*
           |     |             service-sub-layer-ref
           |     +--:(upper-forwarding-sub-layer)     +--:(forwarding-aggregation)
           |     |  +--rw forwarding-aggregation
           |     |     +--rw forwarding-sub-layer*
           |     |             forwarding-sub-layer-ref
           |     +--:(lower-forwarding-sub-layer)     +--:(forwarding-id)
           |        +--rw forwarding-id
           |           +--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? protocol-next-header?     uint8
           |              |  +--rw traffic-class?            uint8 dscp?                     inet:dscp
           |              |  +--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 outgoing-type
              +--rw (outgoing-type)
                 +--:(interface)
                 |  +--rw interface
                 |     +--rw (next-hop-options)
                 |        +--:(simple-next-hop)
                 |        |  +--rw outgoing-interface?
                 |        |  |       if:interface-ref
                 |        |  +--rw (flow-type)?
                 |        |     +--:(ip)
                 |        |     |  +--rw (operation-type)?
                 |        |     |     +--:(ip-forwarding)
                 |        |     |     |  +--rw next-hop-address?
                 |        |     |     |          inet:ip-address
                 |        |     |     +--:(mpls-over-ip-encapsulation)
                 |        |     |        +--rw src-ip-address?
                 |        |     |        |       inet:ip-address
                 |        |     |        +--rw dest-ip-address?
                 |        |     |        |       inet:ip-address
                 |        |     |        +--rw next-header? protocol-next-header?
                 |        |     |        |       uint8
                 |        |     |        +--rw traffic-class? dscp?
                 |        |     |        |       uint8       inet:dscp
                 |        |     |        +--rw flow-label?
                 |        |     |        |       inet:ipv6-flow-label
                 |        |     |        +--rw source-port?
                 |        |     |        |       inet:port-number
                 |        |     |        +--rw destination-port?
                 |        |     |                inet:port-number
                 |        |     +--:(mpls)
                 |        |        +--rw mpls-label-stack
                 |        |           +--rw entry* [id]
                 |        |              +--rw id               uint8
                 |        |              +--rw label?
                 |        |              |       rt-types:mpls-label
                 |        |              +--rw ttl?             uint8
                 |        |              +--rw traffic-class?   uint8
                 |        +--:(next-hop-list)
                 |           +--rw next-hop-list
                  |              +--rw next-hop* [hop-index]
                 |              +--rw hop-index
                 |              |       uint8
                 |              +--rw outgoing-interface?
                 |              |       if:interface-ref
                 |              +--rw (flow-type)?
                 |                 +--:(ip)
                 |                 |  +--rw (operation-type)?
                 |                 |     +--:(ip-forwarding)
                 |                 |     |  +--rw next-hop-address?
                 |                 |     |          inet:ip-address
                 |                 |     +--:(mpls-over-ip-
                 |                 |        |          encapsulation)
                 |                 |        +--rw src-ip-address?
                 |                 |        |       inet:ip-address
                 |                 |        +--rw dest-ip-address?
                 |                 |        |       inet:ip-address
                 |                 |        +--rw next-header? protocol-next-header?
                 |                 |        |       uint8
                 |                 |        +--rw traffic-class? dscp?
                 |                 |        |       uint8       inet:dscp
                 |                 |        +--rw flow-label?
                 |                 |        |       inet:
                  |                    |        |       ipv6-flow-label       inet:ipv6-flow-label
                 |                 |        +--rw source-port?
                 |                 |        |       inet:port-number
                 |                 |        +--rw destination-port?
                 |                 |                inet:port-number
                 |                 +--:(mpls)
                 |                    +--rw mpls-label-stack
                 |                       +--rw entry* [id]
                 |                          +--rw id
                 |                          |       uint8
                 |                          +--rw label?
                 |                          |       rt-types:
                  |                             |       mpls-label       rt-types:mpls-label
                 |                          +--rw ttl?
                 |                          |       uint8
                 |                          +--rw traffic-class?
                 |                                  uint8
                  +--:(service)
                 +--:(service-aggregation)
                 |  +--rw service-aggregation
                 |     +--rw aggregation-service-sub-layer?
                 |     |       service-sub-layer-ref
                 |     +--rw optional-forwarding-label
                 |        +--rw mpls-label-stack
                 |           +--rw entry* [id]
                 |              +--rw id               uint8
                 |              +--rw label?
                 |              |       rt-types:mpls-label
                 |              +--rw ttl?             uint8
                 |              +--rw traffic-class?   uint8
                  +--:(forwarding)
                 +--:(forwarding-sub-layer)
                 |  +--rw forwarding-sub-layer
                 |     +--rw aggregation-forwarding-sub-layer?
                 |     |       forwarding-sub-layer-ref
                 |     +--rw forwarding-label
                 |        +--rw mpls-label-stack
                 |           +--rw entry* [id]
                 |              +--rw id               uint8
                 |              +--rw label?
                 |              |       rt-types:mpls-label
                 |              +--rw ttl?             uint8
                 |              +--rw traffic-class?   uint8
                  +--:(upper-service)
                 +--:(service-sub-layer)
                 |  +--rw service-sub-layer
                 |     +--rw service-sub-layer*
                 |             service-sub-layer-ref
                  +--:(upper-forwarding)
                 +--:(forwarding-disaggregation)
                    +--rw forwarding-disaggregation
                       +--rw forwarding-sub-layer*
                               forwarding-sub-layer-ref

7.  DetNet Configuration YANG Model

 <CODE BEGINS>
 module ietf-detnet{ ietf-detnet {
   yang-version 1.1;
   namespace "urn:ietf:params:xml:ns:yang:ietf-detnet";
   prefix ietf-detnet;

   import ietf-yang-types {
     prefix yang;
     reference
       "RFC 6021 - Common YANG Data Types.";
   }
   import ietf-inet-types {
     prefix inet;
     reference
       "RFC 6991 - Common YANG Data Types.";
   }
   import ietf-ethertypes {
     prefix ethertypes;
     reference
       "RFC 8519 - YANG Data Model for Network Access Control
                   Lists (ACLs).";
   }
   import ietf-routing-types {
     prefix rt-types;
     reference
       "RFC 8294 - Common YANG Data Types for the Routing Area.";
   }
   import ietf-packet-fields {
     prefix packet-fields;
     reference
       "RFC 8519 - YANG Data Model for Network Access Control Lists
        (ACLs).";
   }
   import ietf-interfaces {
     prefix if;
     reference
       "RFC 8343 - A YANG Data Model for Interface Management.";
   }
   import ieee802-dot1q-types{ ieee802-dot1q-types {
     prefix dot1q-types;
     reference
       "IEEE 802.1Qcx-2020 - IEEE Standard for Local and Metropolitan
        Area Networks--Bridges and Bridged Networks Amendment 33: YANG
        Data Model for Connectivity Fault Management.";

   }

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

      Editor:   Don Fedyk
                 <mailto:dfedyk@labn.net>;

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

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

      Editor:   Zhenqiang Li
                 <mailto:lizhenqiang@chinamobile.com>";
   description
     "This YANG module describes the parameters needed
      for DetNet flow configuration and flow status
     reporting";
      reporting.";

   revision 2020-11-12 2021-02-17 {
     description
       "initial revision";
     reference
       "RFC XXXX: draft-ietf-detnet-yang-09"; draft-ietf-detnet-yang-10";
   }

   identity app-status {
     description
       "Base identity from which all application-status
       actions
        status types are derived"; derived.";
     reference
       "draft-ietf-detnet-flow-information-model Section 5.8";
   }

   identity none {
     base app-status;
     description
      "Application
       "This Application has no ingress/egress"; status. This type of status is
        expected when the configuration is incomplete.";
     reference
       "draft-ietf-detnet-flow-information-model Section 5.8";
   }

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

   identity failed {
     base app-status;
     description
       "Application ingres/egresss failed"; failed.";
     reference
       "draft-ietf-detnet-flow-information-model Section 5.8";
   }

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

   identity partial-failed {
     base app-status;
     description
      "Application One
       "This is an Application with 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 Section 5.8";
   }

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

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

   typedef traffic-profile-ref {
     type leafref {
       path "/ietf-detnet:detnet"
          + "/ietf-detnet:traffic-profile"
          + "/ietf-detnet:profile-name";
     }
   }

   typedef ipsec-spi {
     type uint32 {
       range "1..max";
     }
     description
       "IPsec Security Parameters Index"; Index.";
     reference
       "IETF RFC 6071";
   }

   typedef service-operation-type {
     type enumeration {
       enum service-initiation {
         description
          "Operation for DetNet
           "This is an initiating service sub-layer encapsulation"; encapsulation. ";
       }
       enum service-termination {
         description
           "Operation for DetNet service sub-layer decapsulation"; decapsulation.";
       }
       enum service-relay {
         description
           "Operation for DetNet service sub-layer swap"; swap.";
       }
       enum non-detnet {
         description
           "No operation for DetNet service sub-layer"; sub-layer.";
       }
     }
     description
       "Operation type identifies the behavior for this service
        sub-layer instance. Operations are described as unidirectional
        but a service sub-layer may combine operation types.";
   }

   typedef forwarding-operations-type {
     type enumeration {
       enum forward {
        description
          "Operation forward to next-hop";
      }
      enum impose-and-forward {
         description
          "Operation
           "This operation impose outgoing label(s) and forward to
           next-hop";
            next-hop.";
         reference
           " A YANG Data Model for MPLS Base
             draft-ietf-mpls-base-yang.";
       }
       enum pop-and-forward {
         description
          "Operation pop
           "This operation pops the incoming label and forward forwards to next-hop";
            the next-hop.";
         reference
           " A YANG Data Model for MPLS Base
             draft-ietf-mpls-base-yang";
       }
       enum pop-impose-and-forward {
         description
          "Operation pop
           "This operation pops the incoming label, impose imposes one or
            more outgoing label(s) and forward forwards to next-hop"; the next-hop.";
         reference
           " A YANG Data Model for MPLS Base
             draft-ietf-mpls-base-yang.";
       }
       enum swap-and-forward {
         description
          "Operation swap
           "This operation swaps incoming label, with an outgoing
            label and forwards to the next-hop.";
         reference
           " A YANG Data Model for MPLS Base
             draft-ietf-mpls-base-yang";
       }
       enum forward {
         description
           "This operation forward to next-hop"; next-hop.";
       }
       enum pop-and-lookup {
         description
          "Operation pop
           "This operation pops incoming label and perform performs a lookup";
            lookup.";
       }
     }
     description
       "MPLS operations types"; types.  This is an enum modeled after the
        MPLS enum.  The first 4 enums are the same as A YANG Data
        Model for MPLS Base.  draft-ietf-mpls-base-yang.";
   }

   typedef service-protection-type {
     type enumeration {
       enum none {
         description
          "no
           "No service protection provide"; provided.";
       }
       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"; 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"; 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 an end system"; system.";
       }
     }
   }

   typedef sequence-number-generation-type {
     type enumeration {
       enum copy-from-app-flow {
         description
          "Copy
           "This type means copy the app-flow sequence number to the DetNet-flow";
            DetNet-flow.";
       }
       enum generate-by-detnet-flow {
         description
          "Generate
           "This type means generate the sequence number by the
            DetNet flow"; flow.";
       }
     }
     description
       "An enumeration for the sequence number behaviors supported.";
   }

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

     }
     description
       "This type captures the sequence number behavior.";
   }

   grouping ip-header {
     description
      "The
       "This grouping captures the IPv4/IPv6 packet header information";
        information. it is modeled after existing fields";
     leaf src-ip-address {
       type inet:ip-address;
       description
         "The source IP address in the header"; header.";
       reference
         "RFC 6021 Common YANG Data Types";
     }
     leaf dest-ip-address {
       type inet:ip-address;
       description
         "The destination IP address in the header"; header.";
       reference
         "RFC 6021 Common YANG Data Types";
     }
     leaf next-header protocol-next-header {
       type uint8;
       description
        "The next header
         "Internet Protocol number.  Refers to the protocol of the IPv6 header";
          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 traffic-class dscp {
       type uint8; inet:dscp;
       description
         "The traffic class value of in the header"; header.";
       reference
         "RFC 6021 Common YANG Data Types";
     }
     leaf flow-label {
       type inet:ipv6-flow-label;
       description
         "The flow label value of the header"; header.IPV6 only.";
       reference
         "RFC 6021 Common YANG Data Types";
     }
     leaf source-port {
       type inet:port-number;
       description
         "The source port number";
       reference
         "RFC 6021 Common YANG Data Types";
     }
     leaf destination-port {
       type inet:port-number;
       description
         "The destination port number"; number.";
       reference
         "RFC 6021 Common YANG Data Types";
     }
   }

   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"; header.";
     }
     leaf destination-mac-address {
       type yang:mac-address;
       description
         "The destination MAC address value of the Ethernet header"; header.";
     }
     leaf ethertype {
       type ethertypes:ethertype;
       description
         "The Ethernet packet type value of the Ethernet header"; header.";
     }
     leaf vlan-id {
       type dot1q-types:vlanid;
       description
         "The VLAN value of the Ethernet header"; header.";
       reference
         "IEEE 802.1Qcx-2020.";
     }
     leaf pcp {
       type uint8; dot1q-types:priority-type;
       description
         "The priority value of the Ethernet header"; header.";
       reference
         "IEEE 802.1Qcx-2020.";
     }

   }

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

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

   grouping ip-flow-identification ip-flow-id {
     description
       "The IPv4/IPv6 packet header identification information"; information.";
     leaf src-ip-prefix {
       type inet:ip-prefix;
       description
         "The source IP address of the header"; prefix";
       reference
         "RFC 6021 Common YANG Data Types";
     }
     leaf dest-ip-prefix {
       type inet:ip-prefix;
       description
         "The destination IP address of the header"; prefix";
       reference
         "RFC 6021 Common YANG Data Types";
     }
     leaf next-header protocol-next-header {
       type uint8;
       description
        "The next header
         "Internet Protocol number.  Refers to the protocol of the IPv6 header";
          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 traffic-class dscp {
       type uint8; inet:dscp;
       description
         "The traffic class value of in the header"; header.";
       reference
         "RFC 6021 Common YANG Data Types";
     }
     leaf flow-label {
       type inet:ipv6-flow-label;
       description
         "The flow label value of the header"; header.";
       reference
         "RFC 6021 Common YANG Data Types";
     }
     uses source-ip-port-identification; source-ip-port-id;
     uses destination-ip-port-identification; destination-ip-port-id;
     leaf ipsec-spi {
       type ipsec-spi;
       description
         "IPsec Security Parameters Index of the Security Association"; Association.";
       reference
         "IETF RFC 6071"; 6071 IP Security (IPsec) and Internet Key Exchange
          (IKE) Document Roadmap.";
     }
   }

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

   grouping traffic-specification data-flow-spec {
     description
       "app-flow identification";
     choice data-flow-type {
       container traffic-specification tsn-app-flow {
      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 Section 4.1";
      leaf interval l2-header;
       }
       container ip-app-flow {
        type uint32;
        units microseconds;
        description
          "The period of time in which the traffic
           specification cannot be exceeded.";
         uses ip-flow-id;
       }
      leaf max-packets-per-interval
       container mpls-app-flow {
        type uint32;
        description
          "The maximum number of packets that the
           source will transmit in one Interval.";
         uses mpls-flow-id;
       }
      leaf max-payload-size
     }
   }

   grouping detnet-flow-spec {
        type uint32;
     description
          "The maximum payload size that the source
           will transmit.";
       "detnet-flow identification.";
     choice detnet-flow-type {
       case ip-detnet-flow {
         uses ip-flow-id;
       }
      leaf average-packets-per-interval
       case mpls-detnet-flow {
         uses mpls-flow-id;
       }
     }
   }

   grouping app-flows-group {
     description
       "Incoming or outgoing app-flow reference group.";
     leaf-list app-flow-list {
       type uint32; app-flow-ref;
       description
          "The average number
         "List of packets that the
           source will transmit in one interval"; ingress or egress app-flows.";
     }
      leaf average-payload-size
   }

   grouping service-sub-layer-group {
     description
       "Incoming or outgoing service sub-layer reference group.";
     leaf-list service-sub-layer {
       type uint32; service-sub-layer-ref;
       description
          "The average payload size
         "List of incoming or outgoing service sub-layers that the
           source will transmit.";
      } have
          to aggregate or disaggregate.";
     }
   }

   grouping traffic-requirements forwarding-sub-layer-group {
    container traffic-requirements
     description
       "Incoming or outgoing forwarding sub-layer reference group.";

     leaf-list forwarding-sub-layer {
       type forwarding-sub-layer-ref;
       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 Section 4.2";
      leaf min-bandwidth {
        type uint64;
        units bytes-per-second;
        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;
        units microseconds;
        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 uint32;
        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;
        units packets;
        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;
        units packets;
        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 identification";
    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 flow-list{
      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-layers
         that have 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
         "List of incoming or outgoing forwarding sub-layers that
          have to aggregate or disaggregate"; disaggregate.";
     }
   }

   grouping detnet-header {
     description
       "DetNet header info for DetNet encapsulation or swap"; swap.";
     choice header-type {
       case detnet-mpls-header {
         description
           "MPLS label stack for DetNet MPLS encapsulation or
         forwarding";
            forwarding.";
         uses rt-types:mpls-label-stack;
       }
       case detnet-ip-header {
         description
           "IPv4/IPv6 packet header for DetNet IP encapsulation"; 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.";
         leaf outgoing-interface {
           type if:interface-ref;
         }
         choice flow-type {
           case ip {
             leaf next-hop-address {
               type inet:ip-address;
             }
           }
           case mpls {
             uses rt-types:mpls-label-stack;
           }
         }
       }
       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
                "The value if
               "A user-specified identifier utilized to uniquely
                reference the index next-hop entry in the next-hop list.
                The value of this index has no semantic meaning other
                than for a hop."; referencing the entry.";
           }
           leaf outgoing-interface {
             type if:interface-ref;
             description
               "Name of the outgoing interface.";
           }
           choice flow-type {
             case ip {
               leaf next-hop-address {
                 type inet:ip-address;
               }
             }
             case mpls {
               uses rt-types:mpls-label-stack;
             }
           }
         }
       }
     }
   }
  }

   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.";
         leaf outgoing-interface {
           type if:interface-ref;
         }
         choice flow-type {
           case ip {
             choice operation-type {
               case ip-forwarding {
                 leaf next-hop-address {
                   type inet:ip-address;
                 }
               }
               case mpls-over-ip-encapsulation {
                 uses ip-header;
               }
             }
           }
           case mpls {
             uses rt-types:mpls-label-stack;
           }
         }
       }
      case next-hop-list {
       case 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
               "The value of the index for a hop.";
           }
           leaf outgoing-interface {
             type if:interface-ref;
           }
           choice flow-type {
             case ip {
               choice operation-type {
                 case ip-forwarding {
                   leaf next-hop-address {
                     type inet:ip-address;
                   }
                 }
                 case mpls-over-ip-encapsulation {
                   uses ip-header;
                 }
               }
             }
             case mpls {
               uses rt-types:mpls-label-stack;
             }
           }
         }
       }
     }
   }

   container detnet {
     list traffic-profile {
       key "profile-name";
       description
         "A traffic profile.";
       leaf profile-name {
         type string;
         description
           "An Aggregation group ID. Zero means the service is not
            part of a group.";
       }
       container traffic-requirements {
         description
           "This defines the attributes of the App-flow
            regarding bandwidth, latency, latency variation, loss, and
            misordering tolerance.";
         reference
           "draft-ietf-detnet-flow-information-model Section 4.2";
         leaf min-bandwidth {
           type uint64;
           units "bps";
           description
             "This 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;
           units "nanoseconds";
           description
             "This 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;
           units "nanoseconds";
           description
             "This 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 uint32;
           description
             "This 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;
           units "packets";
           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;
           units "packets";
           description
             "This 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.";
         }
       }
       container next-hop-list {
          description
            "Container for multiple next hops.";
          list next-hop flow-spec {
            key "hop-index";
         description
              "An entry in a next-hop list.

               Modules
           "Flow-specification specifies how the Source transmits
            packets for address families MUST augment this list
               with a leaf containing a next-hop address the flow.  This is the promise/request of that
               address family."; the
            Source to the network.  The network uses this flow
            specification to allocate resources and adjust queue
            parameters in network nodes.";
         reference
           "draft-ietf-detnet-flow-information-model Section 5.5";
         leaf hop-index interval {
           type uint8; uint32;
           units "nanoseconds";
           description
             "The value if the index period of for a hop."; time in which the traffic
              specification cannot be exceeded.";
         }
         leaf outgoing-interface max-pkts-per-interval {
           type if:interface-ref; uint32;
           description
             "The maximum number of packets that the
              source will transmit in one interval.";
         }
            choice flow-type {
              case ip {
                choice operation-type {
                  case ip-forwarding {
         leaf next-hop-address max-payload-size {
           type inet:ip-address;
                    }
                  }
                  case mpls-over-ip-encapsulation {
                    uses ip-header;
                  }
                }
              }
              case mpls {
                uses rt-types:mpls-label-stack;
              }
            }
          }
        }
      }
    } uint32;
           description
             "The maximum payload size that the source
              will transmit.";
         }
  container detnet {
    list traffic-profile
         leaf min-payload-size {
      key "profile-name";
           type uint32;
           description
        "A traffic profile";
             "The minimum payload size that the source
              will transmit.";
         }
         leaf profile-name min-pkts-per-interval {
           type string; uint32;
           description
          "An Aggregation group ID. Zero means the service is not
           part
             "The minimum number of a group"; packets that the
              source will transmit in one interval.";
         }
       }
      uses traffic-requirements;
      uses traffic-specification;
       leaf-list member-applications member-apps {
         type app-flow-ref;
         config false;
         description
           "Applications attached to this profile"; profile.";
       }
       leaf-list member-services {
         type service-sub-layer-ref;
         config false;
         description
           "Services attached to this profile"; profile.";
       }
       leaf-list member-forwarding-sublayers member-fwd-sublayers {
         type forwarding-sub-layer-ref;
         config false;
         description
           "Forwarding sub-layer attached to this profile"; profile.";
       }
     }
     container app-flows {
       description
         "The DetNet app-flow configuration"; configuration.";
       reference
         "draft-ietf-detnet-flow-information-model Section Section 4.1";
       list app-flow {
         key "name";
         description
           "A unique (management) identifier of the App-flow.";
         leaf name {
           type string;
           description
             "A unique (management) identifier of the App-flow.";
           reference
             "draft-ietf-detnet-flow-information-model
              Sections 4.1, 5.1";
         }
         leaf app-flow-bidir-congruent {
           type boolean;
           default false;
           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.";
           reference
             "draft-ietf-detnet-flow-information-model Section 4.2";
         }
         leaf outgoing-service {
           type service-sub-layer-ref;
           config false;
           description
             "Binding to this applications outgoing
             service";
              service.";
         }
         leaf incoming-service {
           type service-sub-layer-ref;
           config false;
           description
             "Binding to this applications incoming
             service"; service.";
         }
         leaf traffic-profile {
           type traffic-profile-ref;
           description
             "The Traffic Profile for this group"; group.";
         }
         container ingress {
          // key "name";  This should be a list for aggregation ingress {
           description
             "Ingress DetNet application flows or a compound flow"; flow.";
           leaf name {
             type string;
             description
               "Ingress DetNet application"; application.";
           }
           leaf app-flow-status {
             type identityref {
               base app-status;
             }
             config false;
             description
               "Status of ingress application flow"; flow.";
             reference
               "draft-ietf-detnet-flow-information-model Sections
                4.1, 5.8";
           }
           leaf interface {
             type if:interface-ref;
             description
             "Interface is used for any service type where a whole
             interface is mapped to the applications. It may be
             further filtered by type";
           }
           uses data-flow-spec;
         } //End of app-ingress
         container egress {
           description
             "Route's next-hop attribute.";
          // key "name";  This should be a list for aggregation
           leaf name {
             type string;
             description
               "Egress DetNet application"; application.";
           }
           choice application-type {
             container Ethernet ethernet {
               leaf Ethernet-place-holder interface {
                 type string;
                description
                  "Place holder for matching Ethernet"; if:interface-ref;
               }
               description
                 "TSN unaware maps to an interface.";
             }
             container ip-mpls {
               uses detnet-app-next-hop-content;
             }
           }
         }
       }
     }
     container service-sub-layer {
       description
         "The DetNet service sub-layer configuration"; configuration.";
       list service-sub-layer-list {
         key "name";
         description
           "Services are indexed by name"; name.";
         leaf name {
           type string;
           description
             "The name of the DetNet service sub-layer"; sub-layer.";
         }
         leaf service-rank {
           type uint8;
           description
             "The DetNet rank for this service"; service.";
           reference
             "draft-ietf-detnet-flow-information-model Section 5.7"; 5.7.";
         }
         leaf traffic-profile {
           type traffic-profile-ref;
           description
             "The Traffic Profile for this service"; service.";
         }
         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"; PEORF.";

             reference
               "draft-ietf-detnet-data-plane-framework Section 4.3";
           }
           leaf sequence-number-length {
             type sequence-number-field;
             description
               "Sequence number field length can be one of 0 (none),
               16 bits
                16-bits or 28 bits."; 28-bits.";
           }
         }
         leaf service-operation-type {
           type service-operation-type;
         }
         container incoming-type {
           description
             "The DetNet service sub-layer incoming configuration.";
           choice incoming-type {
             mandatory true;
             description
              "";
               "A service sub-layer may have App flows or other
                service sub-layers.";
             container app-flow {
               description
                 "This service sub-layer is related to the app-flows
                  of the upper layer and provide ingress proxy or
                  ingress aggregation at the ingress node.";
               uses app-flows-ref; app-flows-group;
             }
             container service service-aggregation {
               description
                 "This service sub-layer is related to the service
                  sub-layer of the upper layer and provide
                  service-to-service aggregation at the ingress node
                  or relay node.";
               uses service-sub-layer-ref; service-sub-layer-group;
             }
             container forwarding forwarding-aggregation {
               description
                 "This service sub-layer is related to the forwarding
                  sub-layer of the upper layer and provide
                  forwarding-to-service aggregation at the ingress
                  node or relay node.";
               uses forwarding-sub-layer-ref; forwarding-sub-layer-group;
             }
             container service-identification service-id {
               description
                 "This service sub-layer is related to the service or
                  forwarding sub-layer of the lower layer and provide
                  DetNet service relay or termination at the relay
                  node or egress node.";
               uses detnet-flow-spec;
             }
           }
         }
         container outgoing-type {
           description
             "The DetNet service sub-layer outgoing configuration.";
           choice outgoing-type {
             mandatory true;
             description
              "";
               "The out-going type may be a forwarding Sub-layer or a
                service sub-layer or ? types need to be named.";
             container forwarding-sub-layer {
               description
                 "This service sub-layer is sent to the forwarding
                  sub-layers of the lower layer for DetNet service
                  forwarding or service-to-forwarding aggregation at
                  the ingress node or relay node.  When the operation
                  type is service-initiation, The service sub-layer
                  encapsulates the DetNet Control-Word and services
                  label, which are for individual DetNet flow when the
                  incoming type is app-flow and for aggregated DetNet
                  flow when the incoming type is service or
                  forwarding.  The service sub-layer swaps the service
                  label when the operation type is service-relay.";
               list service-outgoing-list {
                 key "service-outgoing-index";
                 description
                  "list
                   "List of the outgoing service
                    that separately for each node
                    where services will be eliminated"; eliminated.";
                 leaf service-outgoing-index {
                   type uint8;
                 }
                 uses detnet-header;
                list next-layer {
                  key "index";
                  description
                    "list of the forwarding-sub-layer
                     for replicate to multiple paths";
                  leaf index {
                    type uint8;
                  }
                  leaf forwarding-sub-layer {
                    type forwarding-sub-layer-ref;
                    description
                      "forwarding-sub-layer reference point";
                  }
                }
                 uses forwarding-sub-layer-group;
               }
             }
             container service-sub-layer {
               description
                 "This service sub-layer is sent to the service
                  sub-layers of the lower layer for service-to-service
                  aggregation at the ingress node or relay node.  The
                  service sub-layer encapsulates the DetNet
                  Control-Word and S-label when the operation type is
                  service-initiation, and swaps the S-label when the
                  operation type is service-relay.";
               leaf aggregation-service-sub-layer {
                 type service-sub-layer-ref;
                 description
                   "reference point of the service-sub-layer
                    at which this service will be aggregated"; aggregated.";
               }
               container service-label {
                 uses rt-types:mpls-label-stack;
               }
             }
             container upper-app-flow app-flow {
               description
                 "This service sub-layer is sent to the app-flow of
                  the upper layer for egress proxy at the egress node,
                  and decapsulates the DetNet Control-Word and S-label
                  for individual DetNet service.  This outgoing type
                  only can be chosen when the operation type is
                  service-termination.";
               uses app-flows-ref; app-flows-group;
             }
             container upper-service-sub-layer service-disaggregation {
               description
                 "This service sub-layer is sent to the service
                  sub-layer of the upper layer for service-to-service
                  disaggregation at the relay node or egress node, and
                  decapsulates the DetNet Control-Word and A-label for
                  aggregated DetNet service.  This outgoing type only
                  can be chosen when the operation type is
                  service-termination.";
               uses service-sub-layer-ref; service-sub-layer-group;
             }
             container upper-forwarding-sub-layer forwarding-disaggregation {
               description
                 "This service sub-layer is sent to the forwarding
                  sub-layer of the upper layer for
                  forwarding-to-service disaggregation at the relay
                  node or egress node, and decapsulates the DetNet
                  Control-Word and A-label for aggregated DetNet
                  service.  This outgoing type only can be chosen when
                  the operation type is service-termination"; service-termination.";
               uses forwarding-sub-layer-ref; forwarding-sub-layer-group;
             }
           }
         }
       }
     }
     container forwarding-sub-layer {
       description
         "The DetNet forwarding sub-layer configuration"; configuration.";
       list forwarding-sub-layer-list {
         key "name";
         description
          "";
           "The List is one or more DetNet Traffic types.";
         leaf name {
           type string;
           description
             "The name of the DetNet forwarding sub-layer"; sub-layer.";
         }
         leaf traffic-profile {
           type traffic-profile-ref;
           description
             "The Traffic Profile for this group"; group.";
         }
         leaf forwarding-operation-type {
           type forwarding-operations-type;
         }
         container incoming-type {
           description
             "The DetNet forwarding sub-layer incoming configuration.";
           choice incoming-type {
             mandatory true;
             description
               "Cases of incoming types"; types.";
             container service-sub-layer {
               description
                 "This forwarding sub-layer is related to the service
                  sub-layers of the upper layer and provide DetNet
                  forwarding or service-to-forwarding aggregation at
                  the ingress node or relay node.";
              leaf-list sub-layer-list {
                type service-sub-layer-ref;
                config false;
                description
                  "";
              }
               uses service-sub-layer-group;
             }
            case upper-forwarding-sub-layer
             container forwarding-aggregation {
               description
                 "This forwarding sub-layer is related to the
                  forwarding sub-layer of the upper layer and provide
                  forwarding-to-forwarding aggregation at the ingress
                  node or relay node or transit node.";
               uses forwarding-sub-layer-ref; forwarding-sub-layer-group;
             }
            case lower-forwarding-sub-layer {
            //case forwarding-identification
             container forwarding-id  {
               description
                 "This forwarding sub-layer is related to all of the
                  lower layer and provide DetNet forwarding swap or
                  termination at the transit node or relay node or
                  egress node.";

               leaf interface {
                 type if:interface-ref;
                 description
                   "This is the interface associated with the
                    forwarding
                   sub-layer"; sub-layer.";
               }
               uses detnet-flow-spec;
             }
           }
         }
         container outgoing-type {
           description
             "The DetNet forwarding sub-layer outbound
              configuration.";
           choice outgoing-type {
             mandatory true;
             description
              "";
               "This is when a service connected directly to an
               interface with no forwarding sub-layer.";
             container
               interface {
               description
                 "This forwarding sub-layer is sent to the interface
                  for send to next-hop at the ingress node or relay
                  node or transit node.";
               uses detnet-forwarding-next-hop-content;
             }
            case service
             container service-aggregation {
               description
                 "This forwarding sub-layer is sent to the service
                  sub-layers of the lower layer for
                  forwarding-to-service aggregation at the ingress
                  node or relay node.";
               leaf aggregation-service-sub-layer {
                 type service-sub-layer-ref;
               }
               container optional-forwarding-label {
                 uses rt-types:mpls-label-stack;
               }
             }
            case forwarding
             container forwarding-sub-layer {
               description
                 "This forwarding sub-layer is sent to the forwarding
                  sub-layers of the lower layer for
                  forwarding-to-forwarding aggregation at the ingress
                  node or relay node or transit node.";
               leaf aggregation-forwarding-sub-layer {
                 type forwarding-sub-layer-ref;

               }
               container forwarding-label {
                 uses rt-types:mpls-label-stack;
               }
             }
            case upper-service
             container service-sub-layer {
               description
                 "This forwarding sub-layer is sent to the service
                  sub-layer of the upper layer and decapsulate the
                  F-label for DetNet service or service-to-forwarding
                  disaggregation at the relay node or egress node.
                  This outgoing type only can be chosen when the
                  operation type is pop-and-lookup"; pop-and-lookup.";
               uses service-sub-layer-ref; service-sub-layer-group;
             }
            case upper-forwarding
             container forwarding-disaggregation {
               description
                 "This forwarding sub-layer is sent to the forwarding
                  sub-layer of the upper layer and decapsulate the
                  F-label for forwarding-to-forwarding disaggregation
                  at the transit node or relay node or egress node.
                  This outgoing type only can be chosen when the
                  operation type is pop-and-lookup"; pop-and-lookup.";
               uses forwarding-sub-layer-ref; forwarding-sub-layer-group;
             }
           }
         }
       }
     }
   }
 }
 <CODE ENDS>

8.  Open Issues

   There are some open issues that are still under discussion:

   o  Terminology.

   o  Security Considerations.

   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

   [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.ietf-detnet-flow-information-model]
              Varga, B., Farkas, J., Cummings, R., Jiang, Y., and D.
              Fedyk, "DetNet Flow and Service Information Model", draft-ietf-detnet-
              flow-information-model-11 draft-
              ietf-detnet-flow-information-model-14 (work in progress), October
              2020.
              January 2021.

Appendix A.  Examples

   The following examples are provided.  These examples are tested with
   Yanglint and use operational output to exercise both config true and
   config false objects

   o  A simple DetNet application illustrting illustrating multiplexing of
      Application Flows.

   o  A case of Forwarding sub-layer aggregation using a single
      forwarding sublayer.

   o  A case of Service sub-layer aggregation with and aggrgation aggregation
      label.

A.1.  Example JSON Configuration Configuration/Operational

   {
     "ietf-interfaces:interfaces": {
       "interface": [
         {
           "name": "eth0",
           "type": "iana-if-type:ethernetCsmacd",
           "oper-status": "up",
           "statistics": {
             "discontinuity-time": "2020-10-02T23:59:00Z" "2020-12-18T23:59:00Z"
           }
         },
         {
           "name": "eth1",
           "type": "iana-if-type:ethernetCsmacd",
           "oper-status": "up",
           "statistics": {
             "discontinuity-time": "2020-10-02T23:59:00Z" "2020-12-18T23:59:00Z"
           }
         },
         {
           "name": "eth2",
           "type": "iana-if-type:ethernetCsmacd",
           "oper-status": "up",
           "statistics": {
             "discontinuity-time": "2020-10-02T23:59:00Z" "2020-12-18T23:59:00Z"
           }
         },
         {
           "name": "eth3",
           "type": "iana-if-type:ethernetCsmacd",
           "oper-status": "up",
           "statistics": {
             "discontinuity-time": "2020-10-02T23:59:00Z" "2020-12-18T23:59:00Z"
           }
         },
         {
           "name": "eth4",
           "type": "iana-if-type:ethernetCsmacd",
           "oper-status": "up",
           "statistics": {
             "discontinuity-time": "2020-10-02T23:59:00Z" "2020-12-18T23:59:00Z"
           }
         }
       ]
     },
     "ietf-detnet:detnet": {
       "app-flows": {
         "app-flow": [
           {
             "name": "app-0",
             "app-flow-bidir-congruent": false,
             "outgoing-service": "ssl-1",
             "traffic-profile": "pf-1",
             "ingress": {
               "app-flow-status": "ready",
               "interface": "eth0",
               "ip-app-flow": {
                 "src-ip-prefix": "1.1.1.1/32",
                 "dest-ip-prefix": "8.8.8.8/32",
               "traffic-class": "8.8.8.0/24",
                 "dscp": 6
               }
             }
           },
           {
             "name": "app-1",
             "app-flow-bidir-congruent": false,
             "outgoing-service": "ssl-1",
             "traffic-profile": "pf-1",
             "ingress": {
               "app-flow-status": "ready",
               "interface": "eth0",
               "ip-app-flow": {
                 "src-ip-prefix": "1.1.1.1/32", "2.1.1.1/32",
                 "dest-ip-prefix": "8.8.8.8/32",
               "traffic-class": "9.8.8.0/24",
                 "dscp": 7
               }
             }
           }
         ]
       },
       "traffic-profile": [
         {
           "profile-name": "pf-1",
           "traffic-requirements": {
             "min-bandwidth": "100000000",
             "max-latency": 100000000,
             "max-latency-variation": 200000000,
             "max-loss": 2,
             "max-consecutive-loss-tolerance": 5,
             "max-misordering": 0
           },
           "traffic-specification":
           "flow-spec": {
             "interval": 5,
             "max-packets-per-interval":
             "max-pkts-per-interval": 10,
             "max-payload-size": 1500,
             "average-packets-per-interval": 5,
             "average-payload-size": 1000
             "min-payload-size": 100,
             "min-pkts-per-interval": 1
           },
           "member-applications":
           "member-apps": [
             "app-0",
             "app-1"
           ]
         },
         {
           "profile-name": "pf-2",
           "traffic-requirements": {
             "min-bandwidth": "200000000",
             "max-latency": 100000000,
             "max-latency-variation": 200000000,
             "max-loss": 2,
             "max-consecutive-loss-tolerance": 5,
             "max-misordering": 0
           },
           "traffic-specification":
           "flow-spec": {
             "interval": 5,
             "max-packets-per-interval":
             "max-pkts-per-interval": 10,
             "max-payload-size": 1500,
             "average-packets-per-interval": 5,
             "average-payload-size": 1000
             "min-payload-size": 100,
             "min-pkts-per-interval": 1
           },
           "member-services": [
             "ssl-1"
           ]
         },
         {
           "profile-name": "pf-3",
           "traffic-specification":
           "flow-spec": {
             "interval": 5,
             "max-packets-per-interval":
             "max-pkts-per-interval": 10,
             "max-payload-size": 1500
           },
           "member-forwarding-sublayers":
           "member-fwd-sublayers": [
             "fsl-1"
           ]
         }
       ],
       "service-sub-layer": {
         "service-sub-layer-list": [
           {
             "name": "ssl-1",
             "service-rank": 10,
             "traffic-profile": "pf-2",
             "service-operation-type": "service-initiation",
             "service-protection": {
               "service-protection-type": "none",
               "sequence-number-length": "long-sn"
             },
             "incoming-type": {
               "app-flow": {
                 "flow-list":
                 "app-flow-list": [
                   "app-0",
                   "app-1"
                 ]
               }
             },
             "outgoing-type": {
               "forwarding-sub-layer": {
                 "service-outgoing-list": [
                   {
                     "service-outgoing-index": 0,
                     "mpls-label-stack": {
                       "entry": [
                         {
                           "id": 0,
                           "label": 100
                         }
                       ]
                     },
                     "next-layer": [
                       {
                         "index": 0,
                     "forwarding-sub-layer": [
                       "fsl-1"
                     ]
                   }
                 ]
               }
             }
           }
         ]
       },
       "forwarding-sub-layer": {
         "forwarding-sub-layer-list": [
           {
             "name": "fsl-1",
             "traffic-profile": "pf-3",
             "forwarding-operation-type": "impose-and-forward",
             "incoming-type": {
               "service-sub-layer": {
                 "service-sub-layer": [
                   "ssl-1"
                 ]
               }
             },
             "outgoing-type": {
               "interface": {
                 "outgoing-interface": "eth2",
                 "mpls-label-stack": {
                   "entry": [
                     {
                       "id": 0,
                       "label": 10000
                     }
                   ]
                 }
               }
             }
           }
         ]
       }
     }
   }

                Figure 1: Example DetNet JSON configuration

A.2.  Example XML Config: Aggregation using a Forwarding Sublayer

<interfaces
  xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces"
  xmlns:ia="urn:ietf:params:xml:ns:yang:iana-if-type">
    <interface>
      <name>eth0</name>
      <type>ia:ethernetCsmacd</type>
      <oper-status>up</oper-status>
      <statistics>
         <discontinuity-time>2020-10-02T23:59:00Z</discontinuity-time>
         <discontinuity-time>2020-12-18T23:59:00Z</discontinuity-time>
      </statistics>
    </interface>
    <interface>
      <name>eth1</name>
      <type>ia:ethernetCsmacd</type>
      <oper-status>up</oper-status>
      <statistics>
         <discontinuity-time>2020-10-02T23:59:00Z</discontinuity-time>
         <discontinuity-time>2020-12-18T23:59:00Z</discontinuity-time>
      </statistics>

    </interface>
    <interface>
      <name>eth2</name>
      <type>ia:ethernetCsmacd</type>
      <oper-status>up</oper-status>
      <statistics>
         <discontinuity-time>2020-10-02T23:59:00Z</discontinuity-time>
         <discontinuity-time>2020-12-18T23:59:00Z</discontinuity-time>
      </statistics>
    </interface>
    <interface>
      <name>eth3</name>
      <type>ia:ethernetCsmacd</type>
      <oper-status>up</oper-status>
      <statistics>
         <discontinuity-time>2020-10-02T23:59:00Z</discontinuity-time>
         <discontinuity-time>2020-12-18T23:59:00Z</discontinuity-time>
      </statistics>
    </interface>
    <interface>
      <name>eth4</name>
      <type>ia:ethernetCsmacd</type>
      <oper-status>up</oper-status>
      <statistics>
         <discontinuity-time>2020-10-02T23:59:00Z</discontinuity-time>
         <discontinuity-time>2020-12-18T23:59:00Z</discontinuity-time>
      </statistics>
    </interface>
  </interfaces>
<detnet
  xmlns="urn:ietf:params:xml:ns:yang:ietf-detnet">
  <app-flows>
    <app-flow>
      <name>app-1</name>
      <app-flow-bidir-congruent>false</app-flow-bidir-congruent>
      <outgoing-service>ssl-1</outgoing-service>
       <traffic-profile>1</traffic-profile>
      <ingress>
        <app-flow-status>ready</app-flow-status>
        <interface>eth0</interface>
        <ip-app-flow>
          <src-ip-prefix>1.1.1.1/32</src-ip-prefix>
          <dest-ip-prefix>8.8.8.8/32</dest-ip-prefix>
          <dscp>6</dscp>
        </ip-app-flow>
      </ingress>
    </app-flow>
    <app-flow>
      <name>app-2</name>
      <app-flow-bidir-congruent>false</app-flow-bidir-congruent>
      <outgoing-service>ssl-2</outgoing-service>
       <traffic-profile>1</traffic-profile>
      <ingress>
        <app-flow-status>ready</app-flow-status>
        <interface>eth1</interface>
        <src-ip-prefix>1.1.1.2/32</src-ip-prefix>
        <dest-ip-prefix>8.8.8.9/32</dest-ip-prefix>
        <ip-app-flow>
          <src-ip-prefix>2.1.1.1/32</src-ip-prefix>
          <dest-ip-prefix>9.8.8.8/32</dest-ip-prefix>
          <dscp>7</dscp>
        </ip-app-flow>
        <dscp>7</dscp>
      </ingress>
    </app-flow>
  </app-flows>
  <traffic-profile>
    <profile-name>1</profile-name>
    <traffic-requirements>
      <min-bandwidth>100000000</min-bandwidth>
      <max-latency>100000000</max-latency>
      <max-latency-variation>200000000</max-latency-variation>
      <max-loss>2</max-loss>
      <max-consecutive-loss-tolerance>5</max-consecutive-loss-tolerance>
      <max-misordering>0</max-misordering>
    </traffic-requirements>
    <member-applications>app-1</member-applications>
    <member-applications>app-2</member-applications>
    <member-apps>app-1</member-apps>
    <member-apps>app-2</member-apps>
  </traffic-profile>
  <traffic-profile>
    <profile-name>2</profile-name>
    <traffic-requirements>
      <min-bandwidth>100000000</min-bandwidth>
      <max-latency>100000000</max-latency>
      <max-latency-variation>200000000</max-latency-variation>
      <max-loss>2</max-loss>
      <max-consecutive-loss-tolerance>5</max-consecutive-loss-tolerance>
      <max-misordering>0</max-misordering>
    </traffic-requirements>
    <member-services>ssl-1</member-services>
    <member-services>ssl-2</member-services>
  </traffic-profile>
  <traffic-profile>
    <profile-name>3</profile-name>
    <traffic-specification>
    <flow-spec>
      <interval>5</interval>
      <max-packets-per-interval>10</max-packets-per-interval>
      <max-pkts-per-interval>10</max-pkts-per-interval>
      <max-payload-size>1500</max-payload-size>
    </traffic-specification>
    <member-forwarding-sublayers>afl-1</member-forwarding-sublayers>
    </flow-spec>
    <member-fwd-sublayers>afl-1</member-fwd-sublayers>
  </traffic-profile>
  <service-sub-layer>
    <service-sub-layer-list>
      <name>ssl-1</name>
      <service-rank>10</service-rank>
      <traffic-profile>2</traffic-profile>
      <service-operation-type>service-initiation</service-
operation-type>
      <service-operation-type>service-initiation
      </service-operation-type>
      <service-protection>
        <service-protection-type>none</service-protection-type>
        <sequence-number-length>long-sn</sequence-number-length>
      </service-protection>
     <incoming-type>
        <app-flow>
          <flow-list>app-1</flow-list>
          <app-flow-list>app-1</app-flow-list>
        </app-flow>
      </incoming-type>
      <outgoing-type>
        <forwarding-sub-layer>
          <service-outgoing-list>
            <service-outgoing-index>0</service-outgoing-index>
            <mpls-label-stack>
              <entry>
                <id>0</id>
                <label>100</label>
              </entry>
            </mpls-label-stack>
            <next-layer>
              <index>0</index>
            <forwarding-sub-layer>afl-1</forwarding-sub-layer>
            </next-layer>
          </service-outgoing-list>
         </forwarding-sub-layer>
      </outgoing-type>
    </service-sub-layer-list>
    <service-sub-layer-list>
      <name>ssl-2</name>
      <service-rank>10</service-rank>
      <traffic-profile>2</traffic-profile>
      <service-operation-type>service-initiation</service-
operation-type>
      <service-operation-type>service-initiation
      </service-operation-type>
      <service-protection>
        <service-protection-type>none</service-protection-type>
        <sequence-number-length>long-sn</sequence-number-length>
      </service-protection>
     <incoming-type>
        <app-flow>
          <flow-list>app-2</flow-list>
          <app-flow-list>app-2</app-flow-list>
        </app-flow>
      </incoming-type>
      <outgoing-type>
        <forwarding-sub-layer>
          <service-outgoing-list>
            <service-outgoing-index>0</service-outgoing-index>
            <mpls-label-stack>
              <entry>
                <id>0</id>
                <label>103</label>
              </entry>
            </mpls-label-stack>
            <next-layer>
              <index>0</index>
            <forwarding-sub-layer>afl-1</forwarding-sub-layer>
            </next-layer>
          </service-outgoing-list>
         </forwarding-sub-layer>
      </outgoing-type>
    </service-sub-layer-list>
    </service-sub-layer>
    <forwarding-sub-layer>
    <forwarding-sub-layer-list>
      <name>afl-1</name>
      <traffic-profile>3</traffic-profile>
      <forwarding-operation-type>impose-and-forward</forwarding-
operation-type>
      <forwarding-operation-type>impose-and-forward
      </forwarding-operation-type>
      <incoming-type>
        <service-sub-layer>
          <sub-layer-list>ssl-1</sub-layer-list>
          <sub-layer-list>ssl-2</sub-layer-list>
          <service-sub-layer>ssl-1</service-sub-layer>
          <service-sub-layer>ssl-2</service-sub-layer>
        </service-sub-layer>
      </incoming-type>
      <outgoing-type>
        <interface>
          <outgoing-interface>eth2</outgoing-interface>
          <mpls-label-stack>
            <entry>
              <id>0</id>
              <label>10000</label>
            </entry>
          </mpls-label-stack>
          <outgoing-interface>eth2</outgoing-interface>
         </interface>
      </outgoing-type>
    </forwarding-sub-layer-list>
    </forwarding-sub-layer>
</detnet>

                Figure 2: Example DetNet XML configuration

A.3.  Example JSON Service Aggregation Configuration

   {
     "ietf-interfaces:interfaces": {
       "interface": [
         {
           "name": "eth0",
           "type": "iana-if-type:ethernetCsmacd",
           "oper-status": "up",
           "statistics": {
             "discontinuity-time": "2020-10-02T23:59:00Z"
           }
         },
         {
           "name": "eth1",
           "type": "iana-if-type:ethernetCsmacd",
           "oper-status": "up",
           "statistics": {
             "discontinuity-time": "2020-10-02T23:59:00Z"
           }
         },
         {
           "name": "eth2",
           "type": "iana-if-type:ethernetCsmacd",
           "oper-status": "up",
           "statistics": {
             "discontinuity-time": "2020-10-02T23:59:00Z"
           }
         },
         {
           "name": "eth3",
           "type": "iana-if-type:ethernetCsmacd",
           "oper-status": "up",
           "statistics": {
             "discontinuity-time": "2020-10-02T23:59:00Z"
           }
         },
         {
           "name": "eth4",
           "type": "iana-if-type:ethernetCsmacd",
           "oper-status": "up",
           "statistics": {
             "discontinuity-time": "2020-10-02T23:59:00Z"
           }
         }
       ]
     },
     "ietf-detnet:detnet": {
       "app-flows": {
         "app-flow": [
           {
             "name": "app-1",
             "app-flow-bidir-congruent": false,
             "outgoing-service": "ssl-1",
             "traffic-profile": "1",
             "ingress": {
               "app-flow-status": "ready",
               "interface": "eth0",
               "ip-app-flow": {
                 "src-ip-prefix": "1.1.1.1/32",
                 "dest-ip-prefix": "8.8.8.8/32" "8.8.8.8/32",
                 "dscp": 6
               }
             }
           },
           {
             "name": "app-2",
             "app-flow-bidir-congruent": false,
             "outgoing-service": "ssl-2",
             "traffic-profile": "1",
             "ingress": {
               "app-flow-status": "ready",
               "interface": "eth1", "eth0",
               "ip-app-flow": {
                 "src-ip-prefix": "1.1.1.2/32", "2.1.1.1/32",
                 "dest-ip-prefix": "8.8.8.9/32" "9.8.8.8/32",
                 "dscp": 7
               }
             }
           }
         ]
       },
       "traffic-profile": [
         {
           "profile-name": "1",
           "traffic-requirements": {
             "min-bandwidth": "100000000",
             "max-latency": 100000000,
             "max-latency-variation": 200000000,
             "max-loss": 2,
             "max-consecutive-loss-tolerance": 5,
             "max-misordering": 0
           },
           "member-applications":
           "member-apps": [
             "app-1",
             "app-2"
           ]
         },
         {
           "profile-name": "2",
           "traffic-requirements": {
             "min-bandwidth": "100000000",
             "max-latency": 100000000,
             "max-latency-variation": 200000000,
             "max-loss": 2,
             "max-consecutive-loss-tolerance": 5,
             "max-misordering": 0
           },
           "member-services": [
             "ssl-1",
             "ssl-2"
           ]
         },
         {
           "profile-name": "3",
           "traffic-specification":
           "flow-spec": {
             "interval": 5,
             "max-packets-per-interval":
             "max-pkts-per-interval": 10,
             "max-payload-size": 1500
           },
           "member-forwarding-sublayers":
           "member-fwd-sublayers": [
             "afl-1"
           ]
         }
       ],
       "service-sub-layer": {
         "service-sub-layer-list": [
           {
             "name": "ssl-1",
             "service-rank": 10,
             "traffic-profile": "2",
             "service-protection": {
               "service-protection-type": "none",
               "sequence-number-length": "long-sn"
             },
             "service-operation-type": "service-initiation",
             "incoming-type": {
               "app-flow": {
                 "flow-list":
                 "app-flow-list": [
                   "app-1"
                 ]
               }
             },
             "outgoing-type": {
               "service-sub-layer": {
                 "aggregation-service-sub-layer": "asl-1",
                 "service-label": {
                   "mpls-label-stack": {
                     "entry": [
                       {
                         "id": 0,
                         "label": 102
                       }
                     ]
                   }
                 }
               }
             }
           },
           {
             "name": "ssl-2",
             "service-rank": 10,
             "traffic-profile": "2",
             "service-operation-type": "service-initiation",
             "service-protection": {
               "service-protection-type": "none",
               "sequence-number-length": "long-sn"
             },
             "incoming-type": {
               "app-flow": {
                 "flow-list":
                 "app-flow-list": [
                   "app-2"
                 ]
               }
             },
             "outgoing-type": {
               "service-sub-layer": {
                 "aggregation-service-sub-layer": "asl-1",
                 "service-label": {
                   "mpls-label-stack": {
                     "entry": [
                       {
                         "id": 0,
                         "label": 105
                       }
                     ]
                   }
                 }
               }
             }
           },
           {
             "name": "asl-1",
             "service-rank": 10,
             "service-protection": {
               "service-protection-type": "none",
               "sequence-number-length": "long-sn"

             },
             "incoming-type": {
               "service":
               "service-aggregation": {
                 "service-sub-layer": [
                   "ssl-1",
                   "ssl-2"
                 ]
               }
             },
             "outgoing-type": {
               "forwarding-sub-layer": {
                 "service-outgoing-list": [
                   {
                     "service-outgoing-index": 0,
                     "mpls-label-stack": {
                       "entry": [
                         {
                           "id": 0,
                           "label": 1000
                         }
                       ]
                     },
                     "next-layer": [
                       {
                         "index": 0,
                     "forwarding-sub-layer": [
                       "afl-1"
                       }
                     ]
                   }
                 ]
               }
             }
           }
         ]
       },
       "forwarding-sub-layer": {
         "forwarding-sub-layer-list": [
           {
             "name": "afl-1",
             "traffic-profile": "3",
             "forwarding-operation-type": "impose-and-forward",
             "incoming-type": {
               "service-sub-layer": {
                 "service-sub-layer": [
                   "asl-1"
                 ]
               }
             },
             "outgoing-type": {
               "interface": {
                 "outgoing-interface": "eth2",
                 "mpls-label-stack": {
                   "entry": [
                     {
                       "id": 0,
                       "label": 20000
                     }
                   ]
                 }
               }
             }
           }
         ]
       }
     }
   }

             Figure 3: Example DetNet JSON Service Aggregation

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

   Don Fedyk
   LabN Consulting, L.L.C.

   Email: dfedyk@labn.net

   Reshad Rahman
   Individual

   Email: reshad@yahoo.com
   Zhenqiang Li
   China Mobile

   Email: lizhenqiang@chinamobile.com