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Versions: (draft-geng-detnet-conf-yang) 00 01 02 03

Network Working Group                                            X. Geng
Internet-Draft                                                   M. Chen
Intended status: Standards Track                     Huawei Technologies
Expires: September 27, 2019                                        Z. Li
                                                            China Mobile
                                                               R. Rahman
                                                           Cisco Systems
                                                          March 26, 2019


       Deterministic Networking (DetNet) Configuration YANG Model
                       draft-ietf-detnet-yang-02

Abstract

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

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

Requirements Language

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

Status of This Memo

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

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

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

   This Internet-Draft will expire on September 27, 2019.






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Copyright Notice

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

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

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminologies . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  DetNet Configuration Model  . . . . . . . . . . . . . . . . .   4
     3.1.  DetNet Service Proxy Configuration Attributes . . . . . .   4
     3.2.  DetNet Service Layer Configuration Attributes . . . . . .   5
     3.3.  DetNet Transport Layer Configuration Attributes . . . . .   8
   4.  DetNet Configuration YANG Structure . . . . . . . . . . . . .   9
   5.  DetNet Configuration YANG Model . . . . . . . . . . . . . . .  17
   6.  Open Issues . . . . . . . . . . . . . . . . . . . . . . . . .  42
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  43
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  43
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  43
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  43
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  43
     10.2.  Informative References . . . . . . . . . . . . . . . . .  44
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  46

1.  Introduction

   Deterministic Networking (DetNet) [I-D.ietf-detnet-architecture] is
   defined to provide high-quality network service with extremely low
   packet loss rate, bounded low latency and jitter.

   DetNet flow information is defined
   in[I-D.ietf-detnet-flow-information-model], and the DetNet models are
   categorized as:

   o  Flow models: describe characteristics of data flows.  These models
      describe in detail all relevant aspects of a flow that are needed
      to support the flow properly by the network between the source and
      the destination(s).



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   o  Service models: describe characteristics of services being
      provided for data flows over a network.  These models can be
      treated as a network operator independent information model.

   o  Configuration models: describe in detail the settings required on
      network nodes to serve a data flow properly.  Service and flow
      information models are used between the user and the network
      operator.  Configuration information models are used between the
      management/control plane entity of the network and the network
      nodes.

   They are shown in the Figure 1.

               User                Network Operator
                      flow/service
              +---+      model        +---+
              |   | <---------------> | X |    management/control
              +---+                   +-+-+       plane entity
                                        ^
                                        |   configuration
                                        |      model
                                 +------------+
                                 v      |     |
                                +-+     |     v  network
                                +-+     v    +-+  nodes
                                       +-+   +-+
                                       +-+

                     Figure 1. Three Information Models

   DetNet YANG [RFC7950] [RFC6991] models include:

   DetNet YANG [RFC7950] [RFC6991] models are used for DetNet service
   configurations, QoS configuration and topology discovery.  DetNet
   topology model is defined in ietf-detnet-topology-yang.  This
   document defines two YANG models, which are referred to as DetNet
   flow configuration model and DetNet transport QoS model.  DetNet flow
   model is designed for DetNet flow path configuration and flow status
   reporting.  DetNet transport QoS model is designed for QoS attributes
   configuration of transport tunnels to achieve end-to-end bounded
   latency and zero congestion loss.

2.  Terminologies

   This documents uses the terminologies defined in
   [I-D.ietf-detnet-architecture].





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3.  DetNet Configuration Model

   DetNet flow configuration includes DetNet Service Proxy
   configuration, DetNet Service Layer configuration and DetNet
   Transport Layer configuration.  The corresponding attributes used in
   different layers are defined in Section 3.1, 3.2, 3.3, respectively.

3.1.  DetNet Service Proxy Configuration Attributes

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

   o  DetNet L3 Flow Identification, refers to Section 7.1.1 of
      [I-D.ietf-detnet-flow-information-model]

   o  DetNet L2 Flow Identification, refers to Section 7.1.2 of
      [I-D.ietf-detnet-flow-information-model]

   DetNet service proxy can also do flow filtering and policing at the
   ingress to prevent the misbehaviored flows from going into the
   network, which needs:

   o  Traffic Specification, refers to Section 7.2 of
      [I-D.ietf-detnet-flow-information-model]

   The YANG module structure is shown below:





















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                  |  +--rw client-flow* [flow-id]
                  |  |  +--rw flow-id                    uint32
                  |  |  +--rw flow-rank?                 boolean
                  |  |  +--rw (flow-type)?
                  |  |  |  +--:(l2-flow)
                  |  |  |  |  +--rw source-mac-address?        yang:mac-address
                  |  |  |  |  +--rw destination-mac-address?   yang:mac-address
                  |  |  |  |  +--rw ethertype?                 eth:ethertype
                  |  |  |  |  +--rw vlan-id?                   uint16
                  |  |  |  |  +--rw pcp
                  |  |  |  +--:(l3-flow)
                  |  |  |     +--rw (ip-flow-type)?
                  |  |  |     |  +--:(ipv4)
                  |  |  |     |  |  +--rw src-ipv4-address?          inet:ipv4-address
                  |  |  |     |  |  +--rw dest-ipv4-address?         inet:ipv4-address
                  |  |  |     |  |  +--rw dscp?                      uint8
                  |  |  |     |  +--:(ipv6)
                  |  |  |     |     +--rw src-ipv6-address?          inet:ipv6-address
                  |  |  |     |     +--rw dest-ipv6-address?         inet:ipv6-address
                  |  |  |     |     +--rw traffic-class?             uint8
                  |  |  |     |     +--rw flow-label?                inet:ipv6-flow-label
                  |  |  |     +--rw source-port?               inet:port-number
                  |  |  |     +--rw destination-port?          inet:port-number
                  |  |  |     +--rw protocol?                  uint8
                  |  |  +--rw traffic-specification
                  |  |     +--rw interval?                       uint32
                  |  |     +--rw max-packets-per-interval?       uint32
                  |  |     +--rw max-payload-size?               uint32
                  |  |     +--rw average-packets-per-interval?   uint32
                  |  |     +--rw average-payload-size?           uint32
                  |  +--rw service-function?                  service-function-type
                  |  +--rw sequence-number-generation-type?   sequence-number-generation
                  |  +--rw sequence-number-length?            uint8

3.2.  DetNet Service Layer Configuration Attributes

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

   o  DetNet flow identification, refers to Section 7.1.3 of
      [I-D.ietf-detnet-flow-information-model].

   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




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      DetNet service layer, so there is no need for explicit
      indication.)

   o  Flow Rank, refers to Section 7.3 of
      [I-D.ietf-detnet-flow-information-model].

   o  Service Rank, refers to Section 7.4 of
      [I-D.ietf-detnet-flow-information-model].

   o  Service decapsulation, refers to Section 6.2 of
      [I-D.ietf-detnet-dp-sol-mpls]

   o  Transport decapsulation, refers to Section 6.2 of
      [I-D.ietf-detnet-dp-sol-mpls] and Section 3 of
      [I-D.ietf-detnet-dp-sol-ip]

   o  Service encapsulation, refers to Section 6.2 of
      [I-D.ietf-detnet-dp-sol-mpls]

   o  Transport encapsulation, refers to Section 6.2 of
      [I-D.ietf-detnet-dp-sol-mpls]and Section 3 of
      [I-D.ietf-detnet-dp-sol-ip]

   The YANG module structure is shown below:

          +--:(relay-node) {detnet-mpls-dp-sol}?
         |  +--rw relay-node
         |     +--rw name?           string
         |     +--rw service-rank
         |     +--rw in-segment* [in-segment-id]
         |     |  +--rw in-segment-id        uint32
         |     |  +--rw (flow-type)?
         |     |  |  +--:(IP)
         |     |  |  |  +--rw (ip-flow-type)?
         |     |  |  |  |  +--:(ipv4)
         |     |  |  |  |  |  +--rw src-ipv4-address?    inet:ipv4-address
         |     |  |  |  |  |  +--rw dest-ipv4-address?   inet:ipv4-address
         |     |  |  |  |  |  +--rw dscp?                uint8
         |     |  |  |  |  +--:(ipv6)
         |     |  |  |  |     +--rw src-ipv6-address?    inet:ipv6-address
         |     |  |  |  |     +--rw dest-ipv6-address?   inet:ipv6-address
         |     |  |  |  |     +--rw traffic-class?       uint8
         |     |  |  |  |     +--rw flow-label?          inet:ipv6-flow-label
         |     |  |  |  +--rw source-port?         inet:port-number
         |     |  |  |  +--rw destination-port?    inet:port-number
         |     |  |  |  +--rw protocol?            uint8
         |     |  |  +--:(MPLS)
         |     |  |     +--rw service-label        uint32



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         |     |  +--rw service-function?    service-function-type
         |     +--rw out-segment* [out-segment-id]
         |        +--rw out-segment-id                    uint32
         |        +--rw detnet-service-encapsulation
         |        |  +--rw service-label    uint32
         |        |  +--rw control-word?    uint32
         |        +--rw detnet-transport-encapsulation
         |           +--rw (tunnel-type)?
         |           |  +--:(IPv4) {ipv4-tunnel}?
         |           |  |  +--rw ipv4-encapsulation
         |           |  |     +--rw src-ipv4-address     inet:ipv4-address
         |           |  |     +--rw dest-ipv4-address    inet:ipv4-address
         |           |  |     +--rw protocol             uint8
         |           |  |     +--rw ttl?                 uint8
         |           |  |     +--rw dscp?                uint8
         |           |  +--:(IPv6) {ipv6-tunnel}?
         |           |  |  +--rw ipv6-encapsulation
         |           |  |     +--rw src-ipv6-address     inet:ipv6-address
         |           |  |     +--rw dest-ipv6-address    inet:ipv6-address
         |           |  |     +--rw next-header          uint8
         |           |  |     +--rw traffic-class?       uint8
         |           |  |     +--rw flow-label?          inet:ipv6-flow-label
         |           |  |     +--rw hop-limit?           uint8
         |           |  +--:(MPLS) {mpls-tunnel}?
         |           |  |  +--rw mpls-encapsulation
         |           |  |     +--rw label-operations* [label-oper-id]
         |           |  |        +--rw label-oper-id    uint32
         |           |  |        +--rw (label-actions)?
         |           |  |           +--:(label-push)
         |           |  |           |  +--rw label-push
         |           |  |           |     +--rw label        uint32
         |           |  |           |     +--rw s-bit?       boolean
         |           |  |           |     +--rw tc-value?    uint8
         |           |  |           |     +--rw ttl-value?   uint8
         |           |  |           +--:(label-swap)
         |           |  |              +--rw label-swap
         |           |  |                 +--rw out-label     uint32
         |           |  |                 +--rw ttl-action?   ttl-action-definition
         |           |  +--:(MPLS-over-UDP) {mpls-over-udp-tunnel}?
         |           |     +--rw mpls-over-udp-encaplustion
         |           |        +--rw label-operations* [label-oper-id]
         |           |        |  +--rw label-oper-id    uint32
         |           |        |  +--rw (label-actions)?
         |           |        |     +--:(label-push)
         |           |        |     |  +--rw label-push
         |           |        |     |     +--rw label        uint32
         |           |        |     |     +--rw s-bit?       boolean
         |           |        |     |     +--rw tc-value?    uint8



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         |           |        |     |     +--rw ttl-value?   uint8
         |           |        |     +--:(label-swap)
         |           |        |        +--rw label-swap
         |           |        |           +--rw out-label     uint32
         |           |        |           +--rw ttl-action?   ttl-action-definition
         |           |        +--rw source-port?         inet:port-number
         |           |        +--rw destination-port?    inet:port-number
         |           |        +--rw (address-family)?
         |           |           +--:(IPv4)
         |           |           |  +--rw src-ipv4-address     inet:ipv4-address
         |           |           |  +--rw dest-ipv4-address    inet:ipv4-address
         |           |           |  +--rw protocol             uint8
         |           |           |  +--rw ttl?                 uint8
         |           |           |  +--rw dscp?                uint8
         |           |           +--:(IPv6)
         |           |              +--rw src-ipv6-address     inet:ipv6-address
         |           |              +--rw dest-ipv6-address    inet:ipv6-address
         |           |              +--rw next-header          uint8
         |           |              +--rw traffic-class?       uint8
         |           |              +--rw flow-label?          inet:ipv6-flow-label
         |           |              +--rw hop-limit?           uint8

3.3.  DetNet Transport Layer Configuration Attributes

   As defined in [I-D.ietf-detnet-architecture], DetNet transport 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 transport layer.

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

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

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

   The YANG module structure is shown below:




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            +--:(transit-node)
            |  +--rw transit-node
            |     +--rw interval?                       uint32
            |     +--rw max-packets-per-interval?       uint32
            |     +--rw max-payload-size?               uint32
            |     +--rw average-packets-per-interval?   uint32
            |     +--rw average-payload-size?           uint32

   The parameters for DetNet transport QoS are defined in Section 5.

4.  DetNet Configuration YANG Structure

module: ietf-detnet-flow-config
   +--rw detnet-flow
      +--rw (detnet-node-role)?
         +--:(transit-node)
         |  +--rw transit-node
         |     +--rw interval?                       uint32
         |     +--rw max-packets-per-interval?       uint32
         |     +--rw max-payload-size?               uint32
         |     +--rw average-packets-per-interval?   uint32
         |     +--rw average-payload-size?           uint32
         +--:(relay-node) {detnet-mpls-dp-sol}?
         |  +--rw relay-node
         |     +--rw name?           string
         |     +--rw service-rank
         |     +--rw in-segment* [in-segment-id]
         |     |  +--rw in-segment-id        uint32
         |     |  +--rw (flow-type)?
         |     |  |  +--:(IP)
         |     |  |  |  +--rw (ip-flow-type)?
         |     |  |  |  |  +--:(ipv4)
         |     |  |  |  |  |  +--rw src-ipv4-address?    inet:ipv4-address
         |     |  |  |  |  |  +--rw dest-ipv4-address?   inet:ipv4-address
         |     |  |  |  |  |  +--rw dscp?                uint8
         |     |  |  |  |  +--:(ipv6)
         |     |  |  |  |     +--rw src-ipv6-address?    inet:ipv6-address
         |     |  |  |  |     +--rw dest-ipv6-address?   inet:ipv6-address
         |     |  |  |  |     +--rw traffic-class?       uint8
         |     |  |  |  |     +--rw flow-label?          inet:ipv6-flow-label
         |     |  |  |  +--rw source-port?         inet:port-number
         |     |  |  |  +--rw destination-port?    inet:port-number
         |     |  |  |  +--rw protocol?            uint8
         |     |  |  +--:(MPLS)
         |     |  |     +--rw service-label        uint32
         |     |  +--rw service-function?    service-function-type
         |     +--rw out-segment* [out-segment-id]
         |        +--rw out-segment-id                    uint32



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         |        +--rw detnet-service-encapsulation
         |        |  +--rw service-label    uint32
         |        |  +--rw control-word?    uint32
         |        +--rw detnet-transport-encapsulation
         |           +--rw (tunnel-type)?
         |           |  +--:(IPv4) {ipv4-tunnel}?
         |           |  |  +--rw ipv4-encapsulation
         |           |  |     +--rw src-ipv4-address     inet:ipv4-address
         |           |  |     +--rw dest-ipv4-address    inet:ipv4-address
         |           |  |     +--rw protocol             uint8
         |           |  |     +--rw ttl?                 uint8
         |           |  |     +--rw dscp?                uint8
         |           |  +--:(IPv6) {ipv6-tunnel}?
         |           |  |  +--rw ipv6-encapsulation
         |           |  |     +--rw src-ipv6-address     inet:ipv6-address
         |           |  |     +--rw dest-ipv6-address    inet:ipv6-address
         |           |  |     +--rw next-header          uint8
         |           |  |     +--rw traffic-class?       uint8
         |           |  |     +--rw flow-label?          inet:ipv6-flow-label
         |           |  |     +--rw hop-limit?           uint8
         |           |  +--:(MPLS) {mpls-tunnel}?
         |           |  |  +--rw mpls-encapsulation
         |           |  |     +--rw label-operations* [label-oper-id]
         |           |  |        +--rw label-oper-id    uint32
         |           |  |        +--rw (label-actions)?
         |           |  |           +--:(label-push)
         |           |  |           |  +--rw label-push
         |           |  |           |     +--rw label        uint32
         |           |  |           |     +--rw s-bit?       boolean
         |           |  |           |     +--rw tc-value?    uint8
         |           |  |           |     +--rw ttl-value?   uint8
         |           |  |           +--:(label-swap)
         |           |  |              +--rw label-swap
         |           |  |                 +--rw out-label     uint32
         |           |  |                 +--rw ttl-action?   ttl-action-definition
         |           |  +--:(MPLS-over-UDP) {mpls-over-udp-tunnel}?
         |           |     +--rw mpls-over-udp-encaplustion
         |           |        +--rw label-operations* [label-oper-id]
         |           |        |  +--rw label-oper-id    uint32
         |           |        |  +--rw (label-actions)?
         |           |        |     +--:(label-push)
         |           |        |     |  +--rw label-push
         |           |        |     |     +--rw label        uint32
         |           |        |     |     +--rw s-bit?       boolean
         |           |        |     |     +--rw tc-value?    uint8
         |           |        |     |     +--rw ttl-value?   uint8
         |           |        |     +--:(label-swap)
         |           |        |        +--rw label-swap



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         |           |        |           +--rw out-label     uint32
         |           |        |           +--rw ttl-action?   ttl-action-definition
         |           |        +--rw source-port?         inet:port-number
         |           |        +--rw destination-port?    inet:port-number
         |           |        +--rw (address-family)?
         |           |           +--:(IPv4)
         |           |           |  +--rw src-ipv4-address     inet:ipv4-address
         |           |           |  +--rw dest-ipv4-address    inet:ipv4-address
         |           |           |  +--rw protocol             uint8
         |           |           |  +--rw ttl?                 uint8
         |           |           |  +--rw dscp?                uint8
         |           |           +--:(IPv6)
         |           |              +--rw src-ipv6-address     inet:ipv6-address
         |           |              +--rw dest-ipv6-address    inet:ipv6-address
         |           |              +--rw next-header          uint8
         |           |              +--rw traffic-class?       uint8
         |           |              +--rw flow-label?          inet:ipv6-flow-label
         |           |              +--rw hop-limit?           uint8
         |           +--rw interval?                       uint32
         |           +--rw max-packets-per-interval?       uint32
         |           +--rw max-payload-size?               uint32
         |           +--rw average-packets-per-interval?   uint32
         |           +--rw average-payload-size?           uint32
         +--:(edge-node) {detnet-mpls-dp-sol}?
         |  +--rw edge-node
         |     +--rw (edge-node-type)?
         |        +--:(ingress-node)
         |        |  +--rw client-flow* [flow-id]
         |        |  |  +--rw flow-id                    uint32
         |        |  |  +--rw flow-rank?                 boolean
         |        |  |  +--rw (flow-type)?
         |        |  |  |  +--:(l2-flow)
         |        |  |  |  |  +--rw source-mac-address?        yang:mac-address
         |        |  |  |  |  +--rw destination-mac-address?   yang:mac-address
         |        |  |  |  |  +--rw ethertype?                 eth:ethertype
         |        |  |  |  |  +--rw vlan-id?                   uint16
         |        |  |  |  |  +--rw pcp
         |        |  |  |  +--:(l3-flow)
         |        |  |  |     +--rw (ip-flow-type)?
         |        |  |  |     |  +--:(ipv4)
         |        |  |  |     |  |  +--rw src-ipv4-address?          inet:ipv4-address
         |        |  |  |     |  |  +--rw dest-ipv4-address?         inet:ipv4-address
         |        |  |  |     |  |  +--rw dscp?                      uint8
         |        |  |  |     |  +--:(ipv6)
         |        |  |  |     |     +--rw src-ipv6-address?          inet:ipv6-address
         |        |  |  |     |     +--rw dest-ipv6-address?         inet:ipv6-address
         |        |  |  |     |     +--rw traffic-class?             uint8
         |        |  |  |     |     +--rw flow-label?                inet:ipv6-flow-label



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         |        |  |  |     +--rw source-port?               inet:port-number
         |        |  |  |     +--rw destination-port?          inet:port-number
         |        |  |  |     +--rw protocol?                  uint8
         |        |  |  +--rw traffic-specification
         |        |  |     +--rw interval?                       uint32
         |        |  |     +--rw max-packets-per-interval?       uint32
         |        |  |     +--rw max-payload-size?               uint32
         |        |  |     +--rw average-packets-per-interval?   uint32
         |        |  |     +--rw average-payload-size?           uint32
         |        |  +--rw service-function?                  service-function-type
         |        |  +--rw sequence-number-generation-type?   sequence-number-generation
         |        |  +--rw sequence-number-length?            uint8
         |        |  +--rw out-segment* [out-segment-id]
         |        |     +--rw out-segment-id                    uint32
         |        |     +--rw detnet-service-encapsulation
         |        |     |  +--rw service-label    uint32
         |        |     |  +--rw control-word?    uint32
         |        |     +--rw detnet-transport-encapsulation
         |        |        +--rw (tunnel-type)?
         |        |        |  +--:(IPv4) {ipv4-tunnel}?
         |        |        |  |  +--rw ipv4-encapsulation
         |        |        |  |     +--rw src-ipv4-address     inet:ipv4-address
         |        |        |  |     +--rw dest-ipv4-address    inet:ipv4-address
         |        |        |  |     +--rw protocol             uint8
         |        |        |  |     +--rw ttl?                 uint8
         |        |        |  |     +--rw dscp?                uint8
         |        |        |  +--:(IPv6) {ipv6-tunnel}?
         |        |        |  |  +--rw ipv6-encapsulation
         |        |        |  |     +--rw src-ipv6-address     inet:ipv6-address
         |        |        |  |     +--rw dest-ipv6-address    inet:ipv6-address
         |        |        |  |     +--rw next-header          uint8
         |        |        |  |     +--rw traffic-class?       uint8
         |        |        |  |     +--rw flow-label?          inet:ipv6-flow-label
         |        |        |  |     +--rw hop-limit?           uint8
         |        |        |  +--:(MPLS) {mpls-tunnel}?
         |        |        |  |  +--rw mpls-encapsulation
         |        |        |  |     +--rw label-operations* [label-oper-id]
         |        |        |  |        +--rw label-oper-id    uint32
         |        |        |  |        +--rw (label-actions)?
         |        |        |  |           +--:(label-push)
         |        |        |  |           |  +--rw label-push
         |        |        |  |           |     +--rw label        uint32
         |        |        |  |           |     +--rw s-bit?       boolean
         |        |        |  |           |     +--rw tc-value?    uint8
         |        |        |  |           |     +--rw ttl-value?   uint8
         |        |        |  |           +--:(label-swap)
         |        |        |  |              +--rw label-swap
         |        |        |  |                 +--rw out-label     uint32



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         |        |        |  |                 +--rw ttl-action?   ttl-action-definition
         |        |        |  +--:(MPLS-over-UDP) {mpls-over-udp-tunnel}?
         |        |        |     +--rw mpls-over-udp-encaplustion
         |        |        |        +--rw label-operations* [label-oper-id]
         |        |        |        |  +--rw label-oper-id    uint32
         |        |        |        |  +--rw (label-actions)?
         |        |        |        |     +--:(label-push)
         |        |        |        |     |  +--rw label-push
         |        |        |        |     |     +--rw label        uint32
         |        |        |        |     |     +--rw s-bit?       boolean
         |        |        |        |     |     +--rw tc-value?    uint8
         |        |        |        |     |     +--rw ttl-value?   uint8
         |        |        |        |     +--:(label-swap)
         |        |        |        |        +--rw label-swap
         |        |        |        |           +--rw out-label     uint32
         |        |        |        |           +--rw ttl-action?   ttl-action-definition
         |        |        |        +--rw source-port?         inet:port-number
         |        |        |        +--rw destination-port?    inet:port-number
         |        |        |        +--rw (address-family)?
         |        |        |           +--:(IPv4)
         |        |        |           |  +--rw src-ipv4-address     inet:ipv4-address
         |        |        |           |  +--rw dest-ipv4-address    inet:ipv4-address
         |        |        |           |  +--rw protocol             uint8
         |        |        |           |  +--rw ttl?                 uint8
         |        |        |           |  +--rw dscp?                uint8
         |        |        |           +--:(IPv6)
         |        |        |              +--rw src-ipv6-address     inet:ipv6-address
         |        |        |              +--rw dest-ipv6-address    inet:ipv6-address
         |        |        |              +--rw next-header          uint8
         |        |        |              +--rw traffic-class?       uint8
         |        |        |              +--rw flow-label?          inet:ipv6-flow-label
         |        |        |              +--rw hop-limit?           uint8
         |        |        +--rw interval?                       uint32
         |        |        +--rw max-packets-per-interval?       uint32
         |        |        +--rw max-payload-size?               uint32
         |        |        +--rw average-packets-per-interval?   uint32
         |        |        +--rw average-payload-size?           uint32
         |        +--:(egress-node)
         |           +--rw in-segment* [in-segment-id]
         |           |  +--rw in-segment-id        uint32
         |           |  +--rw (flow-type)?
         |           |  |  +--:(IP)
         |           |  |  |  +--rw (ip-flow-type)?
         |           |  |  |  |  +--:(ipv4)
         |           |  |  |  |  |  +--rw src-ipv4-address?    inet:ipv4-address
         |           |  |  |  |  |  +--rw dest-ipv4-address?   inet:ipv4-address
         |           |  |  |  |  |  +--rw dscp?                uint8
         |           |  |  |  |  +--:(ipv6)



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         |           |  |  |  |     +--rw src-ipv6-address?    inet:ipv6-address
         |           |  |  |  |     +--rw dest-ipv6-address?   inet:ipv6-address
         |           |  |  |  |     +--rw traffic-class?       uint8
         |           |  |  |  |     +--rw flow-label?          inet:ipv6-flow-label
         |           |  |  |  +--rw source-port?         inet:port-number
         |           |  |  |  +--rw destination-port?    inet:port-number
         |           |  |  |  +--rw protocol?            uint8
         |           |  |  +--:(MPLS)
         |           |  |     +--rw service-label        uint32
         |           |  +--rw service-function?    service-function-type
         |           +--rw (tunnel-type)?
         |           |  +--:(ipv4) {ipv4-tunnel}?
         |           |  |  +--rw ipv4-decap
         |           |  |     +--rw ipv4-decap    tunnel-decap-action-def
         |           |  |     +--rw ttl-action?   ttl-action-def
         |           |  +--:(ipv6) {ipv6-tunnel}?
         |           |  |  +--rw ipv6-decap
         |           |  |     +--rw ipv6-decap          tunnel-decap-action-def
         |           |  |     +--rw hop-limit-action?   hop-limit-action-def
         |           |  +--:(mpls) {mpls-tunnel}?
         |           |     +--rw label-pop
         |           |        +--rw label-pop     mpls-label-action-def
         |           |        +--rw ttl-action?   ttl-action-def
         |           +--rw label-pop                          mpls-label-action-def
         |           +--rw ttl-action?                        ttl-action-def
         +--:(end-station)
            +--rw end-station
               +--rw (edge-node-type)?
                  +--:(ingress-node)
                  |  +--rw client-flow* [flow-id]
                  |  |  +--rw flow-id                    uint32
                  |  |  +--rw flow-rank?                 boolean
                  |  |  +--rw (flow-type)?
                  |  |  |  +--:(l2-flow)
                  |  |  |  |  +--rw source-mac-address?        yang:mac-address
                  |  |  |  |  +--rw destination-mac-address?   yang:mac-address
                  |  |  |  |  +--rw ethertype?                 eth:ethertype
                  |  |  |  |  +--rw vlan-id?                   uint16
                  |  |  |  |  +--rw pcp
                  |  |  |  +--:(l3-flow)
                  |  |  |     +--rw (ip-flow-type)?
                  |  |  |     |  +--:(ipv4)
                  |  |  |     |  |  +--rw src-ipv4-address?          inet:ipv4-address
                  |  |  |     |  |  +--rw dest-ipv4-address?         inet:ipv4-address
                  |  |  |     |  |  +--rw dscp?                      uint8
                  |  |  |     |  +--:(ipv6)
                  |  |  |     |     +--rw src-ipv6-address?          inet:ipv6-address
                  |  |  |     |     +--rw dest-ipv6-address?         inet:ipv6-address



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                  |  |  |     |     +--rw traffic-class?             uint8
                  |  |  |     |     +--rw flow-label?                inet:ipv6-flow-label
                  |  |  |     +--rw source-port?               inet:port-number
                  |  |  |     +--rw destination-port?          inet:port-number
                  |  |  |     +--rw protocol?                  uint8
                  |  |  +--rw traffic-specification
                  |  |     +--rw interval?                       uint32
                  |  |     +--rw max-packets-per-interval?       uint32
                  |  |     +--rw max-payload-size?               uint32
                  |  |     +--rw average-packets-per-interval?   uint32
                  |  |     +--rw average-payload-size?           uint32
                  |  +--rw service-function?                  service-function-type
                  |  +--rw sequence-number-generation-type?   sequence-number-generation
                  |  +--rw sequence-number-length?            uint8
                  |  +--rw out-segment* [out-segment-id]
                  |     +--rw out-segment-id                    uint32
                  |     +--rw detnet-service-encapsulation
                  |     |  +--rw service-label    uint32
                  |     |  +--rw control-word?    uint32
                  |     +--rw detnet-transport-encapsulation
                  |        +--rw (tunnel-type)?
                  |        |  +--:(IPv4) {ipv4-tunnel}?
                  |        |  |  +--rw ipv4-encapsulation
                  |        |  |     +--rw src-ipv4-address     inet:ipv4-address
                  |        |  |     +--rw dest-ipv4-address    inet:ipv4-address
                  |        |  |     +--rw protocol             uint8
                  |        |  |     +--rw ttl?                 uint8
                  |        |  |     +--rw dscp?                uint8
                  |        |  +--:(IPv6) {ipv6-tunnel}?
                  |        |  |  +--rw ipv6-encapsulation
                  |        |  |     +--rw src-ipv6-address     inet:ipv6-address
                  |        |  |     +--rw dest-ipv6-address    inet:ipv6-address
                  |        |  |     +--rw next-header          uint8
                  |        |  |     +--rw traffic-class?       uint8
                  |        |  |     +--rw flow-label?          inet:ipv6-flow-label
                  |        |  |     +--rw hop-limit?           uint8
                  |        |  +--:(MPLS) {mpls-tunnel}?
                  |        |  |  +--rw mpls-encapsulation
                  |        |  |     +--rw label-operations* [label-oper-id]
                  |        |  |        +--rw label-oper-id    uint32
                  |        |  |        +--rw (label-actions)?
                  |        |  |           +--:(label-push)
                  |        |  |           |  +--rw label-push
                  |        |  |           |     +--rw label        uint32
                  |        |  |           |     +--rw s-bit?       boolean
                  |        |  |           |     +--rw tc-value?    uint8
                  |        |  |           |     +--rw ttl-value?   uint8
                  |        |  |           +--:(label-swap)



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                  |        |  |              +--rw label-swap
                  |        |  |                 +--rw out-label     uint32
                  |        |  |                 +--rw ttl-action?   ttl-action-definition
                  |        |  +--:(MPLS-over-UDP) {mpls-over-udp-tunnel}?
                  |        |     +--rw mpls-over-udp-encaplustion
                  |        |        +--rw label-operations* [label-oper-id]
                  |        |        |  +--rw label-oper-id    uint32
                  |        |        |  +--rw (label-actions)?
                  |        |        |     +--:(label-push)
                  |        |        |     |  +--rw label-push
                  |        |        |     |     +--rw label        uint32
                  |        |        |     |     +--rw s-bit?       boolean
                  |        |        |     |     +--rw tc-value?    uint8
                  |        |        |     |     +--rw ttl-value?   uint8
                  |        |        |     +--:(label-swap)
                  |        |        |        +--rw label-swap
                  |        |        |           +--rw out-label     uint32
                  |        |        |           +--rw ttl-action?   ttl-action-definition
                  |        |        +--rw source-port?         inet:port-number
                  |        |        +--rw destination-port?    inet:port-number
                  |        |        +--rw (address-family)?
                  |        |           +--:(IPv4)
                  |        |           |  +--rw src-ipv4-address     inet:ipv4-address
                  |        |           |  +--rw dest-ipv4-address    inet:ipv4-address
                  |        |           |  +--rw protocol             uint8
                  |        |           |  +--rw ttl?                 uint8
                  |        |           |  +--rw dscp?                uint8
                  |        |           +--:(IPv6)
                  |        |              +--rw src-ipv6-address     inet:ipv6-address
                  |        |              +--rw dest-ipv6-address    inet:ipv6-address
                  |        |              +--rw next-header          uint8
                  |        |              +--rw traffic-class?       uint8
                  |        |              +--rw flow-label?          inet:ipv6-flow-label
                  |        |              +--rw hop-limit?           uint8
                  |        +--rw interval?                       uint32
                  |        +--rw max-packets-per-interval?       uint32
                  |        +--rw max-payload-size?               uint32
                  |        +--rw average-packets-per-interval?   uint32
                  |        +--rw average-payload-size?           uint32
                  +--:(egress-node)
                     +--rw in-segment* [in-segment-id]
                     |  +--rw in-segment-id        uint32
                     |  +--rw (flow-type)?
                     |  |  +--:(IP)
                     |  |  |  +--rw (ip-flow-type)?
                     |  |  |  |  +--:(ipv4)
                     |  |  |  |  |  +--rw src-ipv4-address?    inet:ipv4-address
                     |  |  |  |  |  +--rw dest-ipv4-address?   inet:ipv4-address



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                     |  |  |  |  |  +--rw dscp?                uint8
                     |  |  |  |  +--:(ipv6)
                     |  |  |  |     +--rw src-ipv6-address?    inet:ipv6-address
                     |  |  |  |     +--rw dest-ipv6-address?   inet:ipv6-address
                     |  |  |  |     +--rw traffic-class?       uint8
                     |  |  |  |     +--rw flow-label?          inet:ipv6-flow-label
                     |  |  |  +--rw source-port?         inet:port-number
                     |  |  |  +--rw destination-port?    inet:port-number
                     |  |  |  +--rw protocol?            uint8
                     |  |  +--:(MPLS)
                     |  |     +--rw service-label        uint32
                     |  +--rw service-function?    service-function-type
                     +--rw (tunnel-type)?
                     |  +--:(ipv4) {ipv4-tunnel}?
                     |  |  +--rw ipv4-decap
                     |  |     +--rw ipv4-decap    tunnel-decap-action-def
                     |  |     +--rw ttl-action?   ttl-action-def
                     |  +--:(ipv6) {ipv6-tunnel}?
                     |  |  +--rw ipv6-decap
                     |  |     +--rw ipv6-decap          tunnel-decap-action-def
                     |  |     +--rw hop-limit-action?   hop-limit-action-def
                     |  +--:(mpls) {mpls-tunnel}?
                     |     +--rw label-pop
                     |        +--rw label-pop     mpls-label-action-def
                     |        +--rw ttl-action?   ttl-action-def
                     +--rw label-pop                          mpls-label-action-def
                     +--rw ttl-action?                        ttl-action-def

5.  DetNet Configuration YANG Model

   <CODE BEGINS> file "ietf-detnet@20190321.yang"
   module ietf-detnet{
     namespace "urn:ietf:params:xml:ns:yang:ietf-detnet";
     //yang-version 1.1;
     prefix "detnet-flow";

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

     import ietf-interfaces {
       prefix "if";
     }

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




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   /*  import ietf-ethertypes {
       prefix "eth";
       }*/

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

     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
                  <janos.farkas@ericsson.com>

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

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

        Editor:   Zhenqiang Li
                  <lizhenqiang@chinamobile.com>

        Editor:   Reshad Rahman
                  <rrahman@cisco.com>";
     description
       "This YANG module describes the parameters needed
        for DetNet flow configuration and flow status
        reporting.";

     revision "2018-09-10" {
       description "initial revision";
       reference "RFC XXXX: draft-geng-detnet-config-yang-05";
     }

     feature ipv4-tunnel {
       description
         "This feature means that a node support
          IPv4 tunnel encapsulation capability.";
     }

     feature ipv6-tunnel {
       description



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         "This feature means that a node support
          IPv6 tunnel encapsulation capability.";
     }

     feature mpls-tunnel {
       description
         "This feature means that a node support
          MPLS tunnel encapsulation capability.";
     }

     feature mpls-over-udp-tunnel {
       description
         "This feature means that a node supports
          MPLS over UDP tunnel encapsulation
          capability.";
     }

     feature detnet-mpls-dp-sol {
       description
         "This feature means that MPLS data plane
          solution is supported.";
     }

     identity detnet-node-role {
       description
         "base detnet-node-role";
     }

     identity end-station {
       base detnet-node-role;
       description
         "Commonly called a 'host' in IETF documents,
          and an 'end station' is IEEE 802 documents.
          End systems of interest to this document
          are either sources or destinations of DetNet
          flows.  And end system may or may not be
          DetNet transport layer aware or DetNet
          service layer aware.";
     }

     identity edge-node {
       base detnet-node-role;
       description
         "An instance of a DetNet relay node that
          includes either a DetNet service layer proxy
          function for DetNet service protection (e.g.
          the addition or removal of packet sequencing
          information) for one or more end systems, or



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          starts or terminate congestion protection at
          the DetNet transport layer,analogous to a
          Label Edge Router (LER).";
     }

     identity relay-node {
       base detnet-node-role;
       description
         "A DetNet node including a service layer
          function that interconnects different DetNet
          transport layer paths to provide service
          protection. A DetNet relay node can be a bridge,
          a router, a firewall, or any other system that
          participates in the DetNet service layer. It
          typically incorporates DetNet transport layer
          functions as well, in which case it is
          collocated with a transit node.";
     }

     identity transit-node {
       base detnet-node-role;
       description
         "A node operating at the DetNet transport layer,
          that utilizes link layer and/or network layer
          switching across multiple links and/or
          sub-networks to provide paths for DetNet
          service layer functions. Optionally provides
          congestion protection over those paths. An MPLS
          LSR is an example of a DetNet transit node.";
     }

     identity tunnel-decap-action {
       description
         "Base identify from which all tunnel decap
          actions are derived.
          Tunnel decap actions include:
          ipv4-decap - to decap an IPv4 tunnel,
          ipv6-decap - to decap an IPv6 tunnel.";
     }

     identity ipv4-decap {
       base "tunnel-decap-action";
       description
         "IPv4 tunnel decap.";
     }

     identity ipv6-decap {
       base "tunnel-decap-action";



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       description
         "IPv4 tunnel decap.";
     }

     typedef tunnel-decap-action-def {
       type identityref {
         base "tunnel-decap-action";
       }
       description
         "Tunnel decap def.";
     }

     identity ttl-action {
       description
         "Base identity from which all TTL
          actions are derived.";
     }

     identity no-action {
       base "ttl-action";
       description
         "Do nothing regarding the TTL.";
     }

     identity copy-to-inner {
       base "ttl-action";
       description
         "Copy the TTL of the outer header
          to the inner header.";
     }

     identity decrease-and-copy-to-inner {
       base "ttl-action";
       description
         "Decrease TTL by one and copy the TTL
          to the inner header.";
     }

     typedef ttl-action-def {
       type identityref {
         base "ttl-action";
       }
       description
         "TTL action definition.";
     }

     identity hop-limit-action {
       description



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         "Base identity from which all hop limit
          actions are derived.";
     }

     typedef hop-limit-action-def {
       type identityref {
         base "hop-limit-action";
       }
       description
         "hop limit action definition.";
     }

     identity mpls-label-action {
       description
         "Base identity from which all MPLS label
          operations are derived.
          The MPLS label stack operations include:
          push - to add a new label to a label stack,
          pop - to pop the top label from a label stack,
          swap - to exchange the top label of a label
                 stack with new label.";
     }

     identity label-push {
       base "mpls-label-action";
        description
         "MPLS label stack operation: push.";
     }

     identity label-pop {
       base "mpls-label-action";
       description
         "MPLS label stack operation: pop.";
     }

     identity label-swap {
       base "mpls-label-action";
       description
         "MPLS label stack operation: swap.";
     }

     typedef mpls-label-action-def {
       type identityref {
         base "mpls-label-action";
       }
       description
         "MPLS label action definition.";
     }



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     identity detnet-transport-layer {
       description
         "The layer that optionally provides congestion
          protection for DetNet flows over paths provided
          by the underlying network.";
     }

     identity detnet-service-layer {
       description
         "The layer at which service protection is
          provided, either packet sequencing, replication,
          and elimination or packet encoding";
     }

     typedef service-function-type {
       type enumeration {
         enum null {
           description
             "No service function is enabled.";
         }
         enum replication {
           description
             "A Packet Replication Function (PRF) replicates
              DetNet flow packets and forwards them to one or
              more next hops in the DetNet domain.  The number
              of packet copies sent to each next hop is a
              DetNet flow specific parameter at the node doing
              the replication.  PRF can be implemented by an
              edge node, a relay node, or an end system";
         }
         enum elimination {
           description
             "A Packet Elimination Function (PEF) eliminates
              duplicate copies of packets to prevent excess
              packets flooding the network or duplicate
              packets being sent out of the DetNet domain.
              PEF can be implemented by an edge node, a relay
              node, or an end system.";
         }
         enum ordering {
           description
             "A Packet Ordering Function (POF) re-orders
              packets within a DetNet flow that are received
              out of order.  This function can be implemented
              by an edge node, a relay node, or an end system.";
         }
         enum elimination-ordering {
           description



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             "A combination of PEF and POF that can be
              implemented by an edge node, a relay node, or
              an end system.";
         }
         enum elimination-replication {
           description
             "A combination of PEF and PRF that can be
              implemented by an edge node, a relay node, or
              an end system";
         }
         enum elimination-ordering-replicaiton {
           description
             "A combination of PEF, POF and PRF that can be
              implemented by an edge node, a relay node, or
              an end system";
         }
       }
       description
         "DetNet service function and function combination
          types.";
     }

     typedef sequence-number-generation {
       type enumeration {
         enum "copy-from-app-flow" {
           description
             "DetNet flow sequence number is copied
              from application flow.";
         }
         enum "generated-by-edge-node" {
           description
             "DetNet flow sequence number is generated
              by DetNet edge node.";
         }
       }
       description
         "DetNet sequence number generation types.";
     }

     grouping detnet-sequence-number {
       description
         "DetNet sequence number.";
       leaf sequence-number-generation-type {
         type sequence-number-generation;
         description
           "The way on how sequence number is generated.";
         }
       leaf sequence-number-length {



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         type uint8;
         description
           "DetNet sequence number length.";
       }
     }

     grouping detnet-transport-identifier {
       description
         "DetNet transport identifier";
     }

     grouping detnet-transport-qos {
       //Editor notes: this will be defined in a separate
       //              YANG model (detnet-transport-qos).
       //              More inputs and discussions are needed here.
       description
         "DetNet transport tunnel QoS attributes.";
       uses traffic-specification;
     }

     grouping ipv4-header {
       description
         "The IPv4 header encapsulation information.";
       leaf src-ipv4-address {
         type inet:ipv4-address;
         mandatory true;
         description
           "The source IP address of the header.";
       }
       leaf dest-ipv4-address {
         type inet:ipv4-address;
         mandatory true;
         description
           "The destination IP address of the header.";
       }
       leaf protocol {
         type uint8;
         mandatory true;
         description
           "The protocol id of the header.";
       }
       leaf ttl {
         type uint8;
         description
           "The TTL of the header.";
       }
       leaf dscp {
         type uint8;



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         description
           "The DSCP field of the header.";
       }
     }

     grouping ipv6-header {
       description
         "The IPv6 header encapsulation information.";
       leaf src-ipv6-address {
         type inet:ipv6-address;
         mandatory true;
         description
           "The source IP address of the header.";
       }
       leaf dest-ipv6-address {
         type inet:ipv6-address;
         mandatory true;
         description
           "The destination IP address of the header.";
       }
       leaf next-header {
         type uint8;
         mandatory true;
         description
           "The next header of the IPv6 header.";
       }
       leaf traffic-class {
         type uint8;
         description
           "The traffic class value of the header.";
       }
       leaf flow-label {
         type inet:ipv6-flow-label;
         description
           "The flow label of the header.";
       }
       leaf hop-limit {
         type uint8 {
           range "1..255";
         }
         description
           "The hop limit of the header.";
       }
     }

     grouping mpls-header {
       description
         "The MPLS encapsulation header information.";



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       list label-operations {
         key "label-oper-id";
         description
           "Label operations.";
         leaf label-oper-id {
           type uint32;
           description
             "An optional identifier that points
              to a label operation.";
         }
         choice label-actions {
           description
             "Label action options.";
           case label-push {
             container label-push {
               description
                 "Label push operation.";
               leaf label {
                 type uint32;
                 mandatory true;
                 description
                   "The label to be pushed.";
               }
               leaf s-bit {
                 type boolean;
                 description
                   "The s-bit of the label to be pushed.";
               }
               leaf tc-value {
                 type uint8;
                 description
                   "The traffic class value of the label
                    to be pushed.";
               }
               leaf ttl-value {
                 type uint8;
                 description
                   "The TTL value of the label to be
                    pushed.";
               }
             }
           }
           case label-swap {
             container label-swap {
               description
                 "Label swap operation.";
               leaf out-label {
                 type uint32;



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                 mandatory true;
                 description
                   "The out MPLS label.";
               }
               leaf ttl-action {
                 type ttl-action-def;
                 description
                   "The label ttl actions:
                    - No-action, or
                    - Copy to inner label,or
                    - Decrease (the in label) by 1 and
                      copy to the out label.";
               }
             }
           }
         }
       }
     }

     grouping mpls-detnet-header {
       description
         "The MPLS DetNet encapsulation header information.";
       leaf service-label {
         type uint32;
         mandatory true;
         description
           "The service label of the DetNet header.";
       }
       leaf control-word {
         type uint32;
         description
           "The control word of the DetNet header.";
       }
     }

     grouping udp-header {
       description
         "UDP header.";
       leaf source-port {
         type inet:port-number;
         description
           "The source port number.";
       }
       leaf destination-port {
         type inet:port-number;
         description
           "The destination port number.";
       }



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     }

     grouping transport-tunnel-encap {
       description
         "Defines the transport tunnel encapsulation
          header.";
       choice tunnel-type {
         description
           "Tunnel type includes: IPv4, IPv6, MPLS,
            MPLS over UDP tunnels.";

         case IPv4 {
           if-feature ipv4-tunnel;
           description
             "IPv4 tunnel.";
           container ipv4-encapsulation {
             description
               "IPv4 encapsulation.";
             uses ipv4-header;
           }
         }
         case IPv6 {
           if-feature ipv6-tunnel;
           description
             "IPv6 tunnel.";
           container ipv6-encapsulation {
             description
               "IPv6 encapsulation.";
             uses ipv6-header;
           }
         }
         case MPLS {
           if-feature mpls-tunnel;
           description
             "MPLS tunnel.";
           container mpls-encapsulation {
             description
               "MPLS encapsulation.";
             uses mpls-header;
           }
         }
         case MPLS-over-UDP {
           if-feature mpls-over-udp-tunnel;
           description
             "MPLS over UDP tunnel.";
           container mpls-over-udp-encaplustion {
             description
               "MPLS over udp encapsulation.";



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             uses mpls-header;
             uses udp-header;
             choice address-family {
               description
                 "According to IP address family(IPv4 and IPv6)
                  to apply corresponding IP header.";
               case IPv4 {
                 description
                   "IPv4 address family.";
                 uses ipv4-header;
               }
               case IPv6 {
                 description
                   "IPv6 address family.";
                 uses ipv6-header;
               }
             }
           }
         }
       }
     }


     grouping transport-tunnel-decap {
       description
         "Tunnel decapsulation inforamtion.";
       choice tunnel-type {
         description
           "Nexthop tunnel type options.";
         case ipv4 {
           if-feature ipv4-tunnel;
           container ipv4-decap {
             description
               "IPv4 decap.";
             leaf ipv4-decap  {
               type tunnel-decap-action-def;
               mandatory true;
               description
                 "IPv4 decap operations.";
             }
             leaf ttl-action {
               type ttl-action-def;
               description
                 "The ttl actions:
                  no-action or copy to inner header.";
             }
           }
         }



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         case ipv6 {
           if-feature ipv6-tunnel;
           container ipv6-decap {
             description
               "IPv6 decap.";
             leaf ipv6-decap {
               type tunnel-decap-action-def;
               mandatory true;
               description
                 "IPv6 decap operations.";
             }
             leaf hop-limit-action {
               type hop-limit-action-def;
               description
                 "The hop limit actions:
                  no-action or copy to inner header.";
             }
           }
         }
         case mpls {
           if-feature mpls-tunnel;
           container label-pop {
             description
               "MPLS decap.";
             leaf label-pop {
               type mpls-label-action-def;
               mandatory true;
               description
                 "Pop a label from the label stack.";
             }
             leaf ttl-action {
               type ttl-action-def;
               description
                 "The label ttl actions:
                  no-action or copy to inner label/header.";
             }
           }
         }
       }
     }

     grouping detnet-transport-instance {
       description
         "An instance of the DetNet transport layer, which
          depends on the specific data plane that is used
          as the underlay tunnel.";
       uses transport-tunnel-encap;
       uses detnet-transport-qos;



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     }

     grouping ipv6-flow-identification {
       description
         "IPv6 flow identification.";
       leaf src-ipv6-address {
         type inet:ipv6-address;
         description
           "The source IP address of the header.";
       }
       leaf dest-ipv6-address {
         type inet:ipv6-address;
         description
           "The destination IP address of the header.";
       }
       leaf traffic-class {
         type uint8;
         description
           "The traffic class value of the header.";
       }
       leaf flow-label {
         type inet:ipv6-flow-label;
         description
           "The flow label of the header.";
       }
       leaf source-port {
         type inet:port-number;
         description
           "The source port number.";
       }
       leaf destination-port {
         type inet:port-number;
         description
           "The destination port number.";
       }
       leaf protocol {
         type uint8;
         description
           "The protocol id of the header.";
       }
     }

     grouping ipv4-flow-identification {
       description
         "IPv4 flow identification.";
       leaf src-ipv4-address {
         type inet:ipv4-address;
         description



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           "The source IP address of the header of
            a DetNet flow.";
       }
       leaf dest-ipv4-address {
         type inet:ipv4-address;
         description
           "The destination IP address of the header
            of a DetNet flow.";
       }
       leaf dscp {
         type uint8;
         description
           "The DSCP field of the header of a DetNet flow..";
       }
       leaf source-port {
         type inet:port-number;
         description
           "The source port number.";
       }
       leaf destination-port {
         type inet:port-number;
         description
           "The destination port number.";
       }
       leaf protocol {
         type uint8;
         description
           "The protocol id of the header of a DetNet flow..";
       }
     }

     grouping ip-flow-identification {
       description
           "IP flow identification.";
       choice ip-flow-type {
         description
           "IP flow types: IPv4, IPv6.";
         case ipv4 {
           description
             "IPv4 flow identification.";
           leaf src-ipv4-address {
             type inet:ipv4-address;
             description
               "The source IP address of the header.";
           }
           leaf dest-ipv4-address {
             type inet:ipv4-address;
             description



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               "The destination IP address of the header.";
           }
           leaf dscp {
             type uint8;
             description
               "The DSCP field of the header.";
           }
         }
         case ipv6 {
           description
             "IPv6 flow identification.";
           leaf src-ipv6-address {
             type inet:ipv6-address;
             description
               "The source IP address of the header.";
           }
           leaf dest-ipv6-address {
             type inet:ipv6-address;
             description
               "The destination IP address of the header.";
           }
           leaf traffic-class {
             type uint8;
             description
               "The traffic class value of the header.";
           }
           leaf flow-label {
             type inet:ipv6-flow-label;
             description
               "The flow label of the header.";
           }
         }
       }
       leaf source-port {
         type inet:port-number;
         description
           "The source port number.";
       }
       leaf destination-port {
         type inet:port-number;
         description
           "The destination port number.";
       }
       leaf protocol {
         type uint8;
         description
           "The protocol id of the header.";
       }



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     }

     grouping l3-flow-identification {
       description
         "Layer 3 flow identification in a DetNet
          domain.";
       choice flow-type {
         description
           "L3 DetNet flow types: IP and MPLS.";
         case IP {
           description
             "IP (IPv4 or IPv6) flow identification.";
           uses ip-flow-identification;
         }
         case MPLS {
           description
             "MPLS flow identification.";
           leaf service-label {
             type uint32;
             mandatory true;
             description
               "The service label of a DetNet flow.";
           }
         }
       }
     } //l3-flow-identification

     grouping in-segments {
       description
         "From a receiving node point of view, In-segments
          are a set of instances of a DetNet flow at the
          receiving node. This occurs when Packet Replication
          Function (PRF) is enabled at an upstream node or
          multiple flows map/aggregate to a single DetNet
          flow.";
       list in-segment {
         key "in-segment-id";

         description
           "A list of in segments, there will be
            multiple in-segments for a DetNet flow
            when PRF and PEF enabled.";

         leaf in-segment-id {
           type uint32;
           description
             "in-segment identifier.";
         }



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         uses l3-flow-identification;

         leaf service-function {
           type service-function-type;
           description
             "DetNet service function indication.";
         }
       }
     }

     grouping out-segments {
       description
         "Out-segments are a set of instances of
          a DetNet flow, this occurs when implement
          packet replication function, where an
          in-segment of a DetNet flow is replicated
          to multiple out-segments.";

       list out-segment {
         key "out-segment-id";
         description
           "A list of segments, there will be multiple
            out-segments when perform PRF.";
         leaf out-segment-id {
           type uint32;
           description
             "The out-segment identifier";
         }

         container detnet-service-encapsulation {
           description
             "Only MPLS based DetNet defines DetNet
              service layer. The service encapsulation
              includes service label and control word.";
           uses mpls-detnet-header;
         }

         container detnet-transport-encapsulation {
           description
             "Each out-segment corresponds to a
              transport instance.";
           uses detnet-transport-instance;
         }
       }
     }

     grouping detnet-service-instance {
       description



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         "An end-2-end DetNet service is consisted of
          multiple segments. The concept of segment is
          similar to PW segment. For DetNet, since the
          existing of PREOF, there could be three cases:
          1 - One in-segment maps to multiple
              out-segments, when implement PRF;
          2 - Multiple in-segments map to one
              out-segment, when implement PEF;
          3 - Multiple in-segments map to multiple
              out-segments, when implement a combination
              of PEF and PRF.";

       leaf name {
         type string;
         description
           "The name of the service instance. This MUST
            be unique across all service instances in
            a given network device.";
       }

       leaf service-rank {
         type boolean;
         description
           "Service rank is used by the network to decide
            which services can and cannot exist when network
            resources reach their limit.  Rank is used to help
            to determine which services can be dropped (i.e.,
            removed from node configuration) if a port of a
            node becomes oversubscribed (e.g., due to network
            reconfiguration).  The true value is more important
            than the false value (i.e., services with false
            are dropped first).";
         reference
           "draft-ietf-detnet-flow-information-model";
       }
       uses in-segments;
       uses out-segments;
     }

     grouping l2-flow-identification-at-uni {
       description
         "Layer 2 flow identification at UNI.";
       leaf source-mac-address {
         type yang:mac-address;
         description
           "The source MAC address used for
            flow identification.";
       }



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       leaf destination-mac-address {
         type yang:mac-address;
         description
           "The destination MAC address used for
            flow identification.";
       }

   /*    leaf ethertype {
         type eth:ethertype;
         description
           "The Ethernet Type (or Length) value represented
            in the canonical order defined by IEEE 802.
            The canonical representation uses lowercase
            characters.";
         reference
           "IEEE 802-2014 Clause 9.2";
       }
   */

       leaf vlan-id {
         type uint16 {
           range "1..4094";
         }
         description
           "Vlan Identifier used for L2 flow identification.";
       }
       container pcp {
         //Todo
         description
           "PCP used for L2 flow identification.";
       }
     }

     grouping l3-flow-identification-at-uni {
       description
         "Layer 3 flow identification at UNI.";
       uses ip-flow-identification;
     }

     grouping traffic-specification {
       description
         "traffic-specification specifies how the Source
          transmits packets for the flow.  This is the
          promise/request of the Source to the network.
          The network uses this traffic specification
          to allocate resources and adjust queue
          parameters in network nodes.";
       reference



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         "draft-ietf-detnet-flow-information-model";

       leaf interval {
         type uint32;
         description
           "The period of time in which the traffic
            specification cannot be exceeded";
       }
       leaf max-packets-per-interval {
         type uint32;
         description
           "The maximum number of packets that the
            source will transmit in one Interval.";
       }
       leaf max-payload-size {
         type uint32;
         description
            "The maximum payload size that the source
             will transmit.";
       }
       leaf average-packets-per-interval {
         type uint32;
           description
             "The average number of packets that the
              source will transmit in one Interval";
       }
       leaf average-payload-size {
           type uint32;
           description
            "The average payload size that the
             source will transmit.";
       }
     }

     grouping client-flows-at-uni {
       description
         "The attributes of the client flow at UNI. When
          flow aggregation is enabled at ingress, multiple
          client flows map to a DetNet service instance.";
       list client-flow {
         key "flow-id";
         description
           "A list of client flows.";
         leaf flow-id {
           type uint32;
           description
             "Flow identifier that is unique in a network
              device for client flow identification";



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         }
         leaf flow-rank {
           type boolean;
           description
             "Flow rank is used by the network
              to decide which flows can and cannot exist
              when network resources reach their limit.
              Rank is used to help to determine which flows
              can be dropped (i.e., removed from node
              configuration) if a port of a node becomes
              oversubscribed (e.g., due to network
              reconfiguration).  The true value is more
              important than the false value (i.e., flows
              with false are dropped first).";
           reference
             "draft-ietf-detnet-flow-information-model";
         }
         choice flow-type {
           description
             "Client flow type: layer 2 flow, layer 3
              flow.";
           case l2-flow {
             description
               "Ethernet flow identification.";
             uses l2-flow-identification-at-uni;
           }
           case l3-flow {
             description
               "Layer 3 flow identification, including
                IPv4,IPv6 and MPLS.";
             uses l3-flow-identification-at-uni;
           }
         }
         container traffic-specification {
           description
             "The traffic specification of the client flow.";
           uses traffic-specification;
         }
       }
     }

     grouping detnet-service-decap {
       description
         "DetNet service decapsulation inforamtion.";
       leaf service-label-pop {
         type mpls-label-action-def;
         mandatory true;
         description



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           "Pop the DetNet service label.";
       }
       leaf ttl-action {
         type ttl-action-def;
         description
           "The label ttl actions:
            no-action or copy to inner label/header.";
       }
     }

     grouping detnet-service-proxy-instance {
       description
         "Mapping between App-flows and DetNet flows.";

       choice edge-node-type {
         description
           "There are two types of edge node: ingress node and
            egress node";
         case ingress-node {
           uses client-flows-at-uni;
           leaf service-function {
             type service-function-type;
             description
               "DetNet service function indication.";
           }
           uses detnet-sequence-number;
           uses out-segments;
         }
         case egress-node {
           uses in-segments;
           uses transport-tunnel-decap;
           uses detnet-service-decap;
         }
       }
     }

     container detnet-flow {
       description
         "DetNet flow configuration and status reporting.";
       choice detnet-node-role{
         description
           "Depends on the role of a node to configure
            corresponding flow parameters.";
         case transit-node {
           description
             "DetNet flow configuration parameters for
              transit nodes.";
           container transit-node {



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             description
               "Transit node container.";
             uses detnet-transport-qos;
           }
         }
         case relay-node {
           if-feature detnet-mpls-dp-sol;
           description
             "DetNet flow configuration parameters for
              relay nodes.";
           container relay-node {
             description
               "Relay node container.";
             uses detnet-service-instance;
           }
         }
         case edge-node {
           if-feature detnet-mpls-dp-sol;
           description
             "DetNet flow configuration parameters for
              edge nodes.";
           container edge-node {
             description
               "Edge node container.";
             uses detnet-service-proxy-instance;
           }
         }
         case end-station {
           description
             "DetNet flow configuration parameters for
              end stations.";
           container end-station {
             description
               "End station container.";
             uses detnet-service-proxy-instance;
           }
         }
       }
     }
   }
   <CODE ENDS>

6.  Open Issues

   There are some open issues that are still under discussion:

   o  The Relationship with 802.1 TSN YANG models is TBD.  TSN YANG
      models include: P802.1Qcw, which defines TSN YANG for Qbv, Qbu,



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      and Qci, and P802.1CBcv, which defines YANG for 802.1CB.  The
      possible problem here is how to avoid possible overlap among yang
      models defined in IETF and IEEE.  A common YANG model may be
      defined in the future to shared by both TSN and DetNet.  More
      discussion are needed here.

   o  How to support DetNet OAM is TBD.

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

7.  IANA Considerations

   This document makes no request of IANA.

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

8.  Security Considerations

   <TBD>

9.  Acknowledgements

10.  References

10.1.  Normative References

   [I-D.finn-detnet-bounded-latency]
              Finn, N., Boudec, J., Mohammadpour, E., Zhang, J., Varga,
              B., and J. Farkas, "DetNet Bounded Latency", draft-finn-
              detnet-bounded-latency-03 (work in progress), March 2019.

   [I-D.ietf-detnet-architecture]
              Finn, N., Thubert, P., Varga, B., and J. Farkas,
              "Deterministic Networking Architecture", draft-ietf-
              detnet-architecture-12 (work in progress), March 2019.

   [I-D.ietf-detnet-dp-sol-ip]
              Korhonen, J. and B. Varga, "DetNet IP Data Plane
              Encapsulation", draft-ietf-detnet-dp-sol-ip-02 (work in
              progress), March 2019.

   [I-D.ietf-detnet-dp-sol-mpls]
              Korhonen, J. and B. Varga, "DetNet MPLS Data Plane
              Encapsulation", draft-ietf-detnet-dp-sol-mpls-02 (work in
              progress), March 2019.





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   [I-D.ietf-detnet-flow-information-model]
              Farkas, J., Varga, B., Cummings, R., and Y. Jiang, "DetNet
              Flow Information Model", draft-ietf-detnet-flow-
              information-model-03 (work in progress), March 2019.

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

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

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

10.2.  Informative References

   [I-D.geng-detnet-info-distribution]
              Geng, X., Chen, M., and Z. Li, "IGP-TE Extensions for
              DetNet Information Distribution", draft-geng-detnet-info-
              distribution-03 (work in progress), October 2018.

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

   [I-D.ietf-teas-yang-te]
              Saad, T., Gandhi, R., Liu, X., Beeram, V., and I. Bryskin,
              "A YANG Data Model for Traffic Engineering Tunnels and
              Interfaces", draft-ietf-teas-yang-te-19 (work in
              progress), February 2019.

   [I-D.ietf-teas-yang-te-topo]
              Liu, X., Bryskin, I., Beeram, V., Saad, T., Shah, H., and
              O. Dios, "YANG Data Model for Traffic Engineering (TE)
              Topologies", draft-ietf-teas-yang-te-topo-19 (work in
              progress), February 2019.

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





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

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

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

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

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

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

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

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

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



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

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

Authors' Addresses

   Xuesong Geng
   Huawei Technologies

   Email: gengxuesong@huawei.com


   Mach(Guoyi) Chen
   Huawei Technologies

   Email: mach.chen@huawei.com


   Zhenqiang Li
   China Mobile

   Email: lizhenqiang@chinamobile.com


   Reshad Rahman
   Cisco Systems

   Email: rrahman@cisco.com















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