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Versions: 00 01 02

Internet Engineering Task Force                          S. Barguil, Ed.
Internet-Draft                                  O. Gonzalez de Dios, Ed.
Intended status: Standards Track                              Telefonica
Expires: November 27, 2020                                  M. Boucadair
                                                                  Orange
                                                                L. Munoz
                                                                Vodafone
                                                                L. Jalil
                                                                 Verizon
                                                                   J. Ma
                                                            China Unicom
                                                            May 26, 2020


                    A Layer 2 VPN Network YANG Model
                   draft-barguil-opsawg-l2sm-l2nm-02

Abstract

   This document defines a YANG Data model (called, L2NM) that can be
   used to manage the provisioning of Layer 2 VPN services within a
   Service Provider Network.  This YANG module provides representation
   of the Layer 2 VPN Service from a network standpoint.  The module is
   meant to be used by a Network Controller to derive the configuration
   information that will be sent to relevant network devices.

   The L2NM YANG Data model complements the Layer 2 Service Model
   (RFC8466) by providing a network-centric view of the service that is
   internal to a Service Provider.

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 November 27, 2020.





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Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  Reference architecture  . . . . . . . . . . . . . . . . . . .   4
   3.  Description of the L2NM YANG Module . . . . . . . . . . . . .   7
     3.1.  Structure of the Module . . . . . . . . . . . . . . . . .   7
     3.2.  L2 VPN Service  . . . . . . . . . . . . . . . . . . . . .   7
       3.2.1.  L2 VPN Service Types  . . . . . . . . . . . . . . . .   8
       3.2.2.  Underlying Transport Selection  . . . . . . . . . . .   9
       3.2.3.  Other relevant Network Parameters . . . . . . . . . .   9
     3.3.  L2NM Module Tree  . . . . . . . . . . . . . . . . . . . .  10
   4.  Relation with other YANG Models . . . . . . . . . . . . . . .  18
     4.1.  Relation with L2SM  . . . . . . . . . . . . . . . . . . .  18
     4.2.  Relation with Network Topology  . . . . . . . . . . . . .  18
     4.3.  Relation with Device Models . . . . . . . . . . . . . . .  18
   5.  YANG Module . . . . . . . . . . . . . . . . . . . . . . . . .  19
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  89
   7.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  89
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  89
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  90
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  91
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  91
     10.2.  Informative References . . . . . . . . . . . . . . . . .  92
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  92

1.  Introduction

   [RFC8466] defines a L2VPN Service Model (L2SM) YANG data model that
   can be used for L2VPN service ordering matters between customers and
   Service Providers (SPs).  This document complements the L2SM model by
   creating a network-centric view of the service which can be exposed



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   by a Network to a Service Controller within the Service Provider
   Network.  In particular, the model can be used in the communication
   between the entity that interacts directly with the customer, the
   service orchestrator, (either fully automated or a human operator)
   and the entity in charge of network orchestration and control
   (a.k.a., network controller/orchestrator).

   The data model defined in this document is called the L2VPN Network
   Model (L2NM), playing the role of Service Delivery Model (Figure 3 of
   [RFC8466].  The module supports additional capabilities, such as
   exposing operational parameters, transport protocols selection and
   precedence.  It also serves as a multi-domain orchestration
   interface, because this model can transport resources (i.e., VCID)
   between domains.  The data model keeps minimum customer-related
   information.

   The YANG module reuses containers and groupings from L2SM [RFC8466]
   for the cases that the requirements from L2SM can be translated
   directly to L2NM.

1.1.  Terminology

   This document assumes that the reader is familiar with the contents
   of [RFC6241], [RFC7950], [RFC8466], [RFC8309], and [RFC8453] and uses
   terminology from those documents.  The meaning of the symbols in YANG
   tree diagrams is [RFC8340].

   This document makes use of the following terms:

   o  L2 VPN Customer Service Model (L2SM): Describes the service
      characterization (requirements) of a L2 VPN that interconnects a
      set of sites from the perspective of the customer.  The customer
      service model does not provide details on the Service Provider
      Network.  The L2 VPN Customer Service model is defined in
      [RFC8466].

   o  L2 VPN Service Network Model (L2NM): Refers to the YANG module
      that describes a L2 VPN Service with a network-centric view.  It
      contains information of the Service Provider network and might
      include allocated resources.  It can be used by network
      controllers to manage the Layer 2 VPN Service configuration in the
      Service Provider network.  The YANG module can be consumed by a
      Service Orchestrator to request a VPN Service to a Network
      controller or to expose the list of active L2VPN services.

   o  Service Orchestrator: Refers to a functional entity that interacts
      with the customer of a L2 VPN relying upon, e.g.  L2SM.  The
      Service Orchestrator is responsible of the CE-PE attachment



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      circuits, the PE selection, and requesting the activation of the
      L2 VPN service to a network controller.

   o  Network Controller: Denotes a functional entity responsible for
      the management of the service provider network.

   o  VPN node (vpn-node): Is an abstraction that represents a set of
      policies applied on a PE and that belong to a single VPN service
      (vpn-service).  A VPN service involves one or more VPN nodes.  The
      VPN node will identify the Service Provider node on which the VPN
      is deployed.

   o  VPN network access (vpn-network-access): Is an abstraction that
      represents the network interfaces that are associated to a given
      VPN node.  Traffic coming from the VPN network access belongs to
      the VPN.  The attachment circuits (bearers) between CEs and PEs
      are terminated in the VPN network access.

   o  VPN Service Provider (SP): Is a Service Provider that offers VPN-
      related services.

   o  Service Provider Network (SP Network): Is a network able to
      provide VPN-related services.

1.2.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

2.  Reference architecture

   Figure 1 illustrates how L2NM is used.  As a reminder, this figure is
   an expansion of the architecture presented in Section 3 of [RFC8466]
   and decomposes the box marked "orchestration" in that figure into
   three separate functional components called "Service Orchestration",
   "Network Orchestration", and "Domain Orchestration".

   The reader may refer to [RFC8309] for the distinction between the
   "Customer Service Model", the "Service Delivery Model", the "Network
   Configuration Model", and the "Device Configuration Model".  The
   "Domain Orchestration" and "Config Manager" roles may be performed by
   "SDN Controllers".






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                             +---------------+
                             |   Customer    |
                             +---------------+
             Customer Service Model  |
                    l2vpn-svc        |
                             +---------------+
                             |    Service    |
                             | Orchestration |
                             +---------------+
       Service Delivery Model       |
             L2NM                   |
            (l2vpn-ntw)     |
                             +---------------+
                             |   Network     |
                             | Orchestration |
                             +---------------+
       Network Configuration Model  |
                          __________|____________
                         |                       |
                +---------------+       +---------------+
                |    Domain     |       |     Domain    |
                | Orchestration |       | Orchestration |
                +---------------+       +---------------+
     Device         |        |                   |
     Configuration  |        |                   |
     Model          |        |                   |
               +---------+   |                   |
               | Config  |   |                   |
               | Manager |   |                   |
               +---------+   |                   |
                    |        |                   |
                    | NETCONF/CLI..................
                    |        |                   |
             +------------------------------------------------+
                                 Network

                            +++++++
                            + AAA +
                            +++++++

    ++++++++   Bearer    ++++++++           ++++++++      ++++++++
    + CE A + ----------- + PE A +           + PE B + ---- + CE B +
    ++++++++  Connection ++++++++           ++++++++      ++++++++

               Site A                               Site B

                    Figure 1: L2SM and L2NM Interaction




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   Figure 2 shows how L2SM and L2NM may be used in the context of the
   ACTN architecture [RFC8453].  Figure 2 shows the Customer Network
   Controller (CNC), the Multi-Domain Service Coordinator (MDSC), and
   the Provisioning Network Controller (PNC).  It shows the interfaces
   between these functional units: the CNC-MDSC Interface (CMI), the
   MDSC-PNC Interface (MPI), and the Southbound Interface (SBI).

                  ----------------------------------
                  | Customer                         |
                  |  -----------------------------   |
                  | |             CNC             |  |
                  |  -----------------------------   |
                   ----:-----------------------:-----
                       :                       :
                       : L2SM                  : L2SM
                       :                       :
              ---------:---------     -------------------
             | MDSC    :         |   |       MDSC        |
             |  ---------------  |   |     (parent)      |
             | |    Service    | |    -------------------
             | | Orchestration | |             :
             |  ---------------  |             : L2NM
             |         :         |             :
             |         : L2NM    |    -------------------
             |         :         |   |       MDSC        |
             |  ---------------  |   |      (child)      |
             | |    Network    | |    -------------------
             | | Orchestration | |             :
             |  ---------------  |             :
              ---------:---------              :
                       :                       :
                       : Network Configuration :
                       :                       :
           ------------:-------       ---------:------------
          | Domain     :       |     |         : Domain     |
          | Controller :       |     |         : Controller |
          |        ---------   |     |     ---------        |
          |       |   PNC   |  |     |    |   PNC   |       |
          |        ---------   |     |     ---------        |
           ------------:-------       ---------:------------
                       :                       :
                       : Device Configuration  :
                       :                       :
                   --------                --------
                  | Device |              | Device |
                   --------                --------

              Figure 2: L2SM and L2NM in the Context of ACTN



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3.  Description of the L2NM YANG Module

   The L2NM module ('ietf-l2vpn-ntw') is meant to manage L2 VPNs within
   a service provider network.  In particular, the 'ietf-l2vpn-ntw'
   module can be used to create, modify, and retrieve L2VPN Services in
   a Network Controller.  The module is not aimed at maintaining
   customer-related information.

   Editor's note: Next version of the document will include the full
   description of the parameters.  When the parameters match with L2SM,
   the exact reference will be done

3.1.  Structure of the Module

   The 'ietf-l2vpn-ntw' module uses two main containers: 'vpn-services'
   and 'vpn-profiles'.  The 'vpn-services' container maintains a set of
   L2 VPN Services managed in the service provider network.  The module
   allows to create a new l2 VPN service by adding a new instance of
   'vpn-service'.  The 'vpn-service' is the data structure that
   abstracts the VPN Service.

       module: ietf-l2vpn-ntw
       +--rw l2vpn-ntw
        +--rw vpn-profiles
        |     .......
        +--rw vpn-services
            +--rw vpn-service* [vpn-id]
              ........

                 Figure 3: Simplified L2NM Tree Structure

3.2.  L2 VPN Service

   The 'vpn-service' is the data structure that abstracts a L2 VPN
   Service within the SP Network.  Every 'vpn-service' has a unique
   identifier: vpn-id.  Such vpn-id is only meaningful locally within
   the Network controller.  In order to facilitate the recognition of
   the service, a 'customer-name' and a 'description' may be included.
   The topology of the VPN service is expressed in the 'vpn-service-
   topology' leaf.

   A VPN Service is built by adding instances of 'vpn-node' to the 'vpn-
   nodes' container.  The 'vpn-node' is an abstraction that represents a
   set of policies applied to a network node and that belong to a single
   'vpn-service'.  A 'vpn-node' contains 'vpn-network-accesses', which
   are the interfaces involved in the creation of the VPN.  The customer
   sites are connected to the 'vpn_network_accesses'.  Note that, as




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   this is a network data model, the information about customers site is
   not needed.  Such information, is only relevant in the L2SM model.


    +--rw vpn-services
        +--rw vpn-service* [vpn-id]
              +--rw vpn-id                      svc-id
              +--rw vpn-svc-type?               identityref
              +--rw customer-name?              string
              +--rw svc-topo?                   identityref
              +-rw service-status
              |  +-rw admin
              |  |  +-rw status?      operational-type
              |  |  +-rw timestamp?   yang:date-and-time
              |  +-ro ops
              |     +-ro status?      operational-type
              |     +-ro timestamp?   yang:date-and-time
              |  ...
              +--rw multicast-like {multicast-like}?
              |  ...
              +--rw extranet-vpns {extranet-vpn}?
              |  ...
              |     +--rw local-sites-role?   identityref
              +--rw svc-mtu?                    uint32
              +--rw ce-vlan-preservation?       boolean
              +--rw ce-vlan-cos-perservation?   boolean
              +--rw transport-encapsulation
                    +--rw protocol?   protocols-type
              +--rw vpn-nodes

                                 Figure 4

3.2.1.  L2 VPN Service Types

   The L2 VPN Service types directly matches with the L2VPN Service
   types defined in Section 5.1.3 of [RFC8466]:

   o  Point-to-point VPWSs.

   o  Point-to-point or point-to-multipoint VPWSs [RFC8214].

   o  Multipoint VPLSs.

   o  Multipoint VPLSs connecting one or more root sites and a set of
      leaf sites but preventing inter-leaf-site communication.

   o  EVPN services [RFC7432].




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   o  EVPN VPWSs between two customer sites or a set of customer sites
      as specified in [RFC8214].

3.2.2.  Underlying Transport Selection

   The model enables network operators to select the type of transport
   protocol underlay.  Also, in scenarios with multiple domains and NNI
   types, the selection of the transport protocol underlay is required.
   The Service Provider Network might have several underlay
   possibilities available.  If no underlay transport protocol is
   specified, the Network Controller will take care of the transport
   decision.  The following options are supported in the "underlay-
   transport" container:

      LDP: MPLS with LDP (martini encapsulation).

      GRE: A mesh of GRE tunnels is established between vpn-nodes.

      BGP: BGP tunnels (kompella encapsulation) are preferred to route
      traffic between VPN nodes.

      TE: TE tunnels (either RSVP-TE or SR) are prefered.  The mapping
      details will be specified in draft-ietf-te-service-mapping.

      SR: Non-TE SR is preferred to route traffic.

3.2.3.  Other relevant Network Parameters

   This draft is focus in the development of the network centric set of
   parameters to provision L2VPNs.  Thus, the covered scenarios include
   the augmentation of Virtual Circuit Identifier synchronization in a
   multidomain environment, precedence management (i.e., Primary and
   backup coordination), Split Horizon group management.  The parameters
   are described by the container associated:

   The set of augmentations done in the VPN service are:

      Status: Request and modify the service status

   The set of augmentations done in the Site Network Access are:

      Site Bearer: Reference the NEs and Ports were each site Network
      access belongs.  This may help to preserve the local and farends
      from the Network controller site.

      Precedence: When two L2VPNs are created at the same time, the
      primary secondary option is enabled according to the tunnel role
      on the network.



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      Lag Interface Support.

      Split Horizon group: Split-horizon group name is extended as part
      of the Site Network Access container.

      Status: Request and modify the interface status.

3.3.  L2NM Module Tree

   The tree structure of the YANG module proposed by this document is
   shown below:

   module: ietf-l2vpn-ntw
     +--rw l2vpn-ntw
        +--rw vpn-profiles
        |  +--rw valid-provider-identifiers
        |     +--rw cloud-identifier*            string {cloud-access}?
        |     +--rw qos-profile-identifier*      string
        |     +--rw bfd-profile-identifier*      string
        |     +--rw remote-carrier-identifier*   string
        +--rw vpn-services
           +--rw vpn-service* [vpn-id]
              +--rw vpn-id                      svc-id
              +--rw vpn-service-type?               identityref
              +--rw customer-name?              string
              +--rw svc-topo?                   identityref
              +--rw status?                     operational-type
              +--rw timestamp?                  yang:date-and-time
              +--rw multicast-like {multicast-like}?
              |  +--rw enabled?                     boolean
              |  +--rw customer-tree-flavors
              |  |  +--rw tree-flavor*   identityref
              |  +--rw bum-frame-delivery-modes
              |  |  +--rw bum-frame-delivery* [traffic-type]
              |  |     +--rw traffic-type     identityref
              |  |     +--rw delivery-mode?   identityref
              |  +--rw multicast-gp-port-mapping?   identityref
              +--rw extranet-vpns {extranet-vpn}?
              |  +--rw extranet-vpn* [vpn-id]
              |     +--rw vpn-id              svc-id
              |     +--rw local-sites-role?   identityref
              +--rw svc-mtu?                    uint32
              +--rw ce-vlan-preservation?       boolean
              +--rw ce-vlan-cos-perservation?   boolean
              +--rw underlay-transport
              |  +--rw type*   protocol-type
              +--rw vpn-nodes
                 +--rw vpn-node* [vpn-node-id ne-id]



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                    +--rw vpn-node-id             string
                    +--rw description?            string
                    +--rw node-role?              identityref
                    +--rw ne-id                   string
                    +--rw vpn-target* [id]
                    |  +--rw id                   int8
                    |  +--rw route-targets* [route-target]
                    |  |  +--rw route-target    rt-types:route-target
                    |  +--rw route-target-type
                    |          rt-types:route-target-type
                    +--rw vpn-policies
                    |  +--rw import-policy?   leafref
                    |  +--rw export-policy?   leafref
                    +--rw vpn-network-accesses
                       +--rw vpn-network-access* [network-access-id]
                          +--rw network-access-id
                          |       string
                          +--rw description?
                          |       string
                          +--rw remote-carrier-name?
                          |       string
                          +--rw Interface-mtu?
                          |       uint32
                          +--rw status?
                          |       operational-type
                          +--rw timestamp?
                          |       yang:date-and-time
                          +--rw access-diversity {site-diversity}?
                          |  +--rw groups
                          |  |  +--rw fate-sharing-group-size?   uint16
                          |  |  +--rw group-color?               string
                          |  |  +--rw group* [group-id]
                          |  |     +--rw group-id    string
                          |  +--rw constraints
                          |     +--rw constraint* [constraint-type]
                          |        +--rw constraint-type    identityref
                          |        +--rw target
                          |           +--rw (target-flavor)?
                          |              +--:(id)
                          |              |  +--rw group* [group-id]
                          |              |     +--rw group-id    string
                          |              +--:(all-accesses)
                          |              |  +--rw all-other-accesses?
                          |              |          empty
                          |              +--:(all-groups)
                          |                 +--rw all-other-groups?
                          |                         empty
                          +--rw connection



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                          |  +--rw encapsulation-type?    identityref
                          |  +--rw eth-inf-type*          identityref
                          |  +--rw dot1q-interface
                          |  |  +--rw l2-access-type?   identityref
                          |  |  +--rw dot1q {dot1q}?
                          |  |  |  +--rw physical-inf?   string
                          |  |  |  +--rw c-vlan-id?      uint32
                          |  |  +--rw sub-inf {sub-inf}?
                          |  |  |  +--rw interface-description?
                          |  |  |  |       string
                          |  |  |  +--rw sub-if-id?
                          |  |  |          uint32
                          |  |  +--rw qinq {qinq}?
                          |  |  |  +--rw s-vlan-id?   uint32
                          |  |  |  +--rw c-vlan-id?   uint32
                          |  |  +--rw qinany {qinany}?
                          |  |  |  +--rw s-vlan-id?   uint32
                          |  |  +--rw atm {atm}?
                          |  |  |  +--rw vpi?   uint32
                          |  |  |  +--rw vci?   uint32
                          |  |  +--rw vxlan {vxlan}?
                          |  |     +--rw vni-id?      uint32
                          |  |     +--rw peer-mode?   identityref
                          |  |     +--rw peer-list* [peer-ip]
                          |  |        +--rw peer-ip    inet:ip-address
                          |  +--rw phy-interface
                          |  |  +--rw port-number?           uint32
                          |  |  +--rw port-speed?            uint32
                          |  |  +--rw mode?                  neg-mode
                          |  |  +--rw phy-mtu?               uint32
                          |  |  +--rw flow-control?          string
                          |  |  +--rw physical-if?           string
                          |  |  +--rw circuit-id?            string
                          |  |  +--rw lldp?                  boolean
                          |  |  +--rw oam-802.3ah-link {oam-3ah}?
                          |  |  |  +--rw enable?   boolean
                          |  |  +--rw uni-loop-prevention?   boolean
                          |  +--rw lag-interface {lag-interface}?
                          |  |  +--rw lag-interface*
                          |  |          [lag-interface-number]
                          |  |     +--rw lag-interface-number    uint32
                          |  |     +--rw lacp
                          |  |        +--rw lacp-state?         boolean
                          |  |        +--rw lacp-mode?          boolean
                          |  |        +--rw lacp-speed?         boolean
                          |  |        +--rw mini-link?          uint32
                          |  |        +--rw system-priority?    uint16
                          |  |        +--rw micro-bfd {micro-bfd}?



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                          |  |        |  +--rw micro-bfd-on-off?
                          |  |        |  |       enumeration
                          |  |        |  +--rw bfd-interval?
                          |  |        |  |       uint32
                          |  |        |  +--rw bfd-hold-timer?
                          |  |        |          uint32
                          |  |        +--rw bfd {bfd}?
                          |  |        |  +--rw bfd-enabled?
                          |  |        |  |       boolean
                          |  |        |  +--rw (holdtime)?
                          |  |        |     +--:(profile)
                          |  |        |     |  +--rw profile-name?
                          |  |        |     |          string
                          |  |        |     +--:(fixed)
                          |  |        |        +--rw fixed-value?
                          |  |        |                uint32
                          |  |        +--rw member-link-list
                          |  |        |  +--rw member-link* [name]
                          |  |        |     +--rw name
                          |  |        |     |       string
                          |  |        |     +--rw port-speed?
                          |  |        |     |       uint32
                          |  |        |     +--rw mode?
                          |  |        |     |       neg-mode
                          |  |        |     +--rw link-mtu?
                          |  |        |     |       uint32
                          |  |        |     +--rw oam-802.3ah-link
                          |  |        |             {oam-3ah}?
                          |  |        |        +--rw enable?   boolean
                          |  |        +--rw flow-control?       string
                          |  |        +--rw lldp?               boolean
                          |  +--rw cvlan-id-to-svc-map* [svc-id]
                          |  |  +--rw svc-id      leafref
                          |  |  +--rw cvlan-id* [vid]
                          |  |     +--rw vid    uint32
                          |  +--rw split-horizon
                          |  |  +--rw group-name?   string
                          |  +--rw l2cp-control {L2CP-control}?
                          |     +--rw stp-rstp-mstp?    control-mode
                          |     +--rw pause?            control-mode
                          |     +--rw lacp-lamp?        control-mode
                          |     +--rw link-oam?         control-mode
                          |     +--rw esmc?             control-mode
                          |     +--rw l2cp-802.1x?      control-mode
                          |     +--rw e-lmi?            control-mode
                          |     +--rw lldp?             boolean
                          |     +--rw ptp-peer-delay?   control-mode
                          |     +--rw garp-mrp?         control-mode



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                          +--rw availability
                          |  +--rw access-priority?       uint32
                          |  +--rw (redundancy-mode)?
                          |     +--:(single-active)
                          |     |  +--rw single-active?   boolean
                          |     +--:(all-active)
                          |        +--rw all-active?      boolean
                          +--rw service
                          |  +--rw svc-input-bandwidth {input-bw}?
                          |  |  +--rw input-bandwidth* [type]
                          |  |     +--rw type      identityref
                          |  |     +--rw cos-id?   uint8
                          |  |     +--rw vpn-id?   svc-id
                          |  |     +--rw cir?      uint64
                          |  |     +--rw cbs?      uint64
                          |  |     +--rw eir?      uint64
                          |  |     +--rw ebs?      uint64
                          |  |     +--rw pir?      uint64
                          |  |     +--rw pbs?      uint64
                          |  +--rw svc-output-bandwidth {output-bw}?
                          |  |  +--rw output-bandwidth* [type]
                          |  |     +--rw type      identityref
                          |  |     +--rw cos-id?   uint8
                          |  |     +--rw vpn-id?   svc-id
                          |  |     +--rw cir?      uint64
                          |  |     +--rw cbs?      uint64
                          |  |     +--rw eir?      uint64
                          |  |     +--rw ebs?      uint64
                          |  |     +--rw pir?      uint64
                          |  |     +--rw pbs?      uint64
                          |  +--rw qos {qos}?
                          |     +--rw classification-policy
                          |     |  +--rw rule* [id]
                          |     |     +--rw id
                          |     |     |       string
                          |     |     +--rw (match-type)?
                          |     |     |  +--:(match-flow)
                          |     |     |  |  +--rw match-flow
                          |     |     |  |     +--rw dscp?
                          |     |     |  |     |       inet:dscp
                          |     |     |  |     +--rw dot1q?
                          |     |     |  |     |       uint16
                          |     |     |  |     +--rw pcp?
                          |     |     |  |     |       uint8
                          |     |     |  |     +--rw src-mac?
                          |     |     |  |     |       yang:mac-address
                          |     |     |  |     +--rw dst-mac?
                          |     |     |  |     |       yang:mac-address



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                          |     |     |  |     +--rw color-type?
                          |     |     |  |     |       identityref
                          |     |     |  |     +--rw target-sites*
                          |     |     |  |     |       svc-id
                          |     |     |  |     |       {target-sites}?
                          |     |     |  |     +--rw any?
                          |     |     |  |     |       empty
                          |     |     |  |     +--rw vpn-id?
                          |     |     |  |             svc-id
                          |     |     |  +--:(match-application)
                          |     |     |     +--rw match-application?
                          |     |     |             identityref
                          |     |     +--rw target-class-id?
                          |     |             string
                          |     +--rw qos-profile
                          |        +--rw (qos-profile)?
                          |           +--:(standard)
                          |           |  +--rw profile?   leafref
                          |           +--:(custom)
                          |              +--rw classes {qos-custom}?
                          |                 +--rw class* [class-id]
                          |                    +--rw class-id
                          |                    |       string
                          |                    +--rw direction?
                          |                    |       identityref
                          |                    +--rw policing?
                          |                    |       identityref
                          |                    +--rw byte-offset?
                          |                    |       uint16
                          |                    +--rw frame-delay
                          |                    |  +--rw (flavor)?
                          |                    |     +--:(lowest)
                          |                    |     |  +--rw use-lowest
                          |                    |     |   -latency? empty
                          |                    |     +--:(boundary)
                          |                    |        +--rw delay-
                          |                    |           bound? uint16
                          |                    +--rw frame-jitter
                          |                    |  +--rw (flavor)?
                          |                    |     +--:(lowest)
                          |                    |     |  +--rw use-lowest
                          |                    |     |    -jitter? empty
                          |                    |     +--:(boundary)
                          |                    |        +--rw delay-
                          |                    |           bound? uint32
                          |                    +--rw frame-loss
                          |                    |  +--rw rate?
                          |                    |          decimal64



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                          |                    +--rw bandwidth
                          |                       +--rw guaranteed-bw-
                          |                       |    percent decimal64
                          |                       +--rw end-to-end?
                          |                               empty
                          +--rw svc-precedence
                          |  +--rw precedence?   identityref
                          +--rw broadcast-unknown-unicast-multicast
                          |  +--rw multicast-site-type?
                          |  |       enumeration
                          |  +--rw multicast-gp-address-mapping* [id]
                          |  |  +--rw id                 uint16
                          |  |  +--rw vlan-id?           uint32
                          |  |  +--rw mac-gp-address?
                          |  |  |       yang:mac-address
                          |  |  +--rw port-lag-number?   uint32
                          |  +--rw bum-overall-rate?
                          |  |       uint32
                          |  +--rw bum-rate-per-type* [type]
                          |     +--rw type    identityref
                          |     +--rw rate?   uint32
                          +--rw ethernet-service-oam
                          |  +--rw md-name?        string
                          |  +--rw md-level?       uint8
                          |  +--rw cfm-802.1-ag
                          |  |  +--rw n2-uni-c* [maid]
                          |  |  |  +--rw maid
                          |  |  |  |       string
                          |  |  |  +--rw mep-id?
                          |  |  |  |       uint32
                          |  |  |  +--rw mep-level?
                          |  |  |  |       uint32
                          |  |  |  +--rw mep-up-down?
                          |  |  |  |       enumeration
                          |  |  |  +--rw remote-mep-id?
                          |  |  |  |       uint32
                          |  |  |  +--rw cos-for-cfm-pdus?
                          |  |  |  |       uint32
                          |  |  |  +--rw ccm-interval?
                          |  |  |  |       uint32
                          |  |  |  +--rw ccm-holdtime?
                          |  |  |  |       uint32
                          |  |  |  +--rw alarm-priority-defect?
                          |  |  |  |       identityref
                          |  |  |  +--rw ccm-p-bits-pri?
                          |  |  |          ccm-priority-type
                          |  |  +--rw n2-uni-n* [maid]
                          |  |     +--rw maid



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                          |  |     |       string
                          |  |     +--rw mep-id?
                          |  |     |       uint32
                          |  |     +--rw mep-level?
                          |  |     |       uint32
                          |  |     +--rw mep-up-down?
                          |  |     |       enumeration
                          |  |     +--rw remote-mep-id?
                          |  |     |       uint32
                          |  |     +--rw cos-for-cfm-pdus?
                          |  |     |       uint32
                          |  |     +--rw ccm-interval?
                          |  |     |       uint32
                          |  |     +--rw ccm-holdtime?
                          |  |     |       uint32
                          |  |     +--rw alarm-priority-defect?
                          |  |     |       identityref
                          |  |     +--rw ccm-p-bits-pri?
                          |  |             ccm-priority-type
                          |  +--rw y-1731* [maid]
                          |     +--rw maid
                          |     |       string
                          |     +--rw mep-id?
                          |     |       uint32
                          |     +--rw type?
                          |     |       identityref
                          |     +--rw remote-mep-id?
                          |     |       uint32
                          |     +--rw message-period?
                          |     |       uint32
                          |     +--rw measurement-interval?
                          |     |       uint32
                          |     +--rw cos?
                          |     |       uint32
                          |     +--rw loss-measurement?
                          |     |       boolean
                          |     +--rw synthethic-loss-measurement?
                          |     |       boolean
                          |     +--rw delay-measurement
                          |     |  +--rw enable-dm?   boolean
                          |     |  +--rw two-way?     boolean
                          |     +--rw frame-size?
                          |     |       uint32
                          |     +--rw session-type?
                          |             enumeration
                          +--rw mac-loop-prevention
                          |  +--rw frequency?         uint32
                          |  +--rw protection-type?   identityref



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                          |  +--rw number-retries?    uint32
                          +--rw access-control-list
                          |  +--rw mac* [mac-address]
                          |     +--rw mac-address    yang:mac-address
                          +--rw mac-addr-limit
                          |  +--rw mac-num-limit?   uint16
                          |  +--rw time-interval?   uint32
                          |  +--rw action?          identityref
                          +--rw site-bearers
                             +--rw bearer-id?
   string

                                 Figure 5

4.  Relation with other YANG Models

   The L2NM model, aimed at managing the L2VPN Services in a Service
   Provider Network controller/orchestrator has relations with other
   YANG modules.

4.1.  Relation with L2SM

   [RFC8466] defines a L2VPN Service YANG data Model (L2SM) that can be
   used for communication between customers and VPN service providers.
   Hence, the model provides inputs to the Network Operator to deliver
   such service to the customer.  Hence, most parts of the model can be
   directly mapped into L2NM.

   o  Service requirements: The service requirements can be directly
      taken from L2SM to L2NM.

   o  Sites: The sites from L2SM are used to select the Service Prodider
      node.  The site information is NOT maintained in L2NM

4.2.  Relation with Network Topology

   The L2NM model manages VPN Services running over Service Provider
   Backbone network.  The set of nodes over which it is possible to
   deploy a L2 VPN Service MAY be part of the topology contained in an
   ietf-network module.

4.3.  Relation with Device Models

   Creating services in the l2vpn-ntw module will will lead at some
   point to the configuration of devices.  Hence, it is foreseen that
   the data for the device yang modules will be derived partially from
   the L2NM vpn-service container.  Note that L2NM is NOT a device
   model.



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5.  YANG Module

<CODE BEGINS>file "ietf-l2vpn-ntw@2020-05-26.yang"
module ietf-l2vpn-ntw {
  yang-version 1.1;
  namespace "urn:ietf:params:xml:ns:yang:ietf-l2vpn-ntw";
  prefix l2vpn-ntw;

  import ietf-inet-types {
    prefix inet;
    reference
      "Section 4 of RFC 6991";
  }
  import ietf-yang-types {
    prefix yang;
    reference
      "Section 3 of RFC 6991";
  }
  import ietf-netconf-acm {
    prefix nacm;
    reference
      "RFC 8341: Network Configuration Access Control Model";
  }
  import ietf-l3vpn-ntw {
    prefix l3vpn-ntw;
    reference
      "RFC NNNN: A Layer 3 VPN Network YANG Model";
  }
  import ietf-l2vpn-svc {
    prefix l2vpn-svc;
    reference
      "RFC 8466: YANG Data Model for Layer 2 Virtual Private
        Network (L2VPN) Service Delivery";
  }
  import ietf-packet-fields {
    prefix pf;
    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";
  }

  organization
    "IETF OPSA (Operations and Management Area) Working Group";



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  contact
    "WG Web:   <http://tools.ietf.org/wg/opsawg/>
        WG List:  <mailto:opsawg@ietf.org>
        Editor:    Samier Barguil
                  <mailto:samier.barguilgiraldo.ext@telefonica.com>
        Editor:    Oscar Gonzalez de Dios
                  <mailto:oscar.gonzalezdedios@telefonica.com>
        Author:    Mohamed Boucadair
                  <mailto:mohamed.boucadair@orange.com>
        Author:    Luis Angel Munoz
                  <mailto:luis-angel.munoz@vodafone.com>
        Author:    Luay Jalil
                  <mailto:luay.jalil@verizon.com>
        Author:    Jichun Ma
                  <mailto:majc16@chinaunicom.cn>
    ";
  description
    "The YANG module defines a generic network configuration
     model for Layer 2 VPN services common across all of the
     vendor implementations.

     Copyright (c) 2020 IETF Trust and the persons identified as
     authors of the code.  All rights reserved.

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

     This version of this YANG module is part of RFC XXXX
     (https://www.rfc-editor.org/info/rfcXXXX); see the RFC itself
     for full legal notices.";

  revision 2020-05-26 {
    description
      "Third revision -02 version";
    reference
      "RFC XXXX: A Layer 2 VPN Network YANG Model.";
  }

  /* Features */

 feature multicast-like {
    description
      "Indicates the support of multicast-like capabilities
       in a L2VPN.";



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  }

  feature extranet-vpn {
    description
      "Indicates the Support of Extranet VPN.";
  }

  feature target-sites {
    description
      "Indicates the support of 'target-sites' match flow
       parameter.";
  }

  feature l2cp-control {
    description
      "Indicates the support of L2CP control.";
  }

  feature input-bw {
    description
      "Indicates the suppport of Input Bandwidth
      in a VPN.";
  }

  feature output-bw {
    description
      "Indicates the support of Output Bandwidth in
       a VPN";
  }

  feature uni-list {
    description
      "Indicates thesupport of UNI list in a VPN.";
  }

  feature cloud-access {
    description
      "Indicates the support of a VPN to connect to a Cloud Service
       provider.";
  }

  feature oam-3ah {
    description
      "Indicates the support of OAM 802.3ah.";
  }

  feature micro-bfd {
    description



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      "Indicates the support of Micro-BFD.";
  }

  feature bfd {
    description
      "Indicates the support of BFD.";
  }

  feature signaling-options {
    description
      "Indicates the support of signalling option.";
  }

  feature site-diversity {
    description
      "Indicates the support of site diversity constraints in
       a VPN.";
  }

  feature encryption {
    description
      "Indicates the support of encryption.";
  }

  feature always-on {
    description
      "Indicates the support for always-on access
       constraint.";
  }

  feature requested-type {
    description
      "Indicates the support for requested-type access
       constraint.";
  }

  feature bearer-reference {
    description
      "Indicates the support for bearer-reference access
       constraint.";
  }

  feature qos {
    description
      "Indicates the support of Class of Services.";
  }

  feature lag-interface {



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    description
      "Enable lag-interface.";
  }

  feature vlan {
    description
      "Indicates the support of VLAN.";
  }

  feature dot1q {
    description
      "Indicates the support of Dot1Q.";
  }

  feature sub-inf {
    description
      "Indicates the support of Sub Interface.";
  }

  feature qinq {
    description
      "Indicates the support of QinQ.";
  }

  feature qinany {
    description
      "Indicates the support of QinAny.";
  }

  feature atm {
    description
      "Indicates the support of ATM.";
  }

  feature vxlan {
    description
      "Indicates the support of VxLAN.";
  }

  feature ipv4 {
    description
      "Indicates the support in a VPN.";
  }

  feature ipv6 {
    description
      "Indicates the support in a VPN.";
  }



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  feature lan-tag {
    description
      "Indicates the LAN Tag support in a VPN.";
  }

  /* Typedefs */

  typedef protocol-type {
    type enumeration {
      enum GRE {
        value 0;
        description
          "Transport based on GRE.";
      }
      enum LDP {
        value 1;
        description
          "Transport based on LDP.";
        reference
          "RFC 5036: LDP Specification";
      }
      enum BGP {
        value 2;
        description
          "Transport based on BGP.";
        reference
          "RFC 4760: Multiprotocol Extensions for BGP-4";
      }
      enum SR {
        value 3;
        description
          "Transport based on Segment Routing";
        reference
         "RFC 8660: Segment Routing with the MPLS Data Plane";
      }
      enum SR-TE {
        value 4;
        description
          "Transport based on Segment Routing for Traffic
           Engineering";
      }
      enum RSVP-TE {
        value 5;
        description
          "Transport based on RSVP-TE signaled tunnels";
        reference
         "RFC 3209: RSVP-TE: Extensions to RSVP for LSP Tunnels";
      }



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    }
    description
      "This are attributes used to identify underly
       transport protocols used to deliver the service.";
  }

  typedef operational-type {
    type enumeration {
      enum up {
        value 0;
        description
          "Operational status UP.";
      }
      enum down {
        value 1;
        description
          "Operational status DOWN";
      }
      enum unknown {
        value 2;
        description
          "Operational status UNKNOWN";
      }
    }
    description
      "This is an attribute used to determine the
       operational status of a particular element.";
  }

  typedef svc-id {
    type string;
    description
      "Indicates the type of service component identifier.";
  }

  typedef ccm-priority-type {
    type uint8 {
      range "0..7";
    }
    description
      "A 3 bit priority value to be used in the VLAN tag,
       if present in the transmitted frame.";
  }

  typedef control-mode {
    type enumeration {
      enum peer {
        description



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          "Peer mode, i.e., participate in the protocol towards
           the CE. Peering is common for LACP  and E-LMI and
           occasionally for LLDP. For virtual private services
           the Subscriber can also request that the Service
           Provider peer spanning tree.";
      }
      enum tunnel {
        description
          "Tunnel mode,i.e.,pass to the egress or destination site.
           For EPL, the expectation is that L2CP frames are
           tunneled.";
      }
      enum discard {
        description
          "Discard mode,i.e.,discard the frame.";
      }
    }
    description
      "Defining a type of the control mode on L2CP protocols.";
  }

  typedef neg-mode {
    type enumeration {
      enum full-duplex {
        description
          "Defining Full duplex mode";
      }
      enum auto-neg {
        description
          "Defining Auto negotiation mode";
      }
    }
    description
      "Defining a type of the negotiation mode";
  }

  /* Identities */

  identity multicast-tree-type {
    base l2vpn-svc:multicast-tree-type;
    description
      "Base identity for multicast tree type.";
  }

  identity mapping-type {
    base l2vpn-svc:multicast-gp-address-mapping;
    description
      "Identity mapping-type.";



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  }

  identity tf-type {
    base l2vpn-svc:tf-type;
    description
      "Identity traffic-type";
  }

  identity pwe-encapsulation-type {
    base l2vpn-svc:encapsulation-type;
    description
      "Identity pwe-encapsulation-type";
  }

  identity l2tp-pw-type {
    description
      "Identity for L2TP PW type";
  }

  identity encapsulation-type {
    description
      "Identity for encapsulation type";
  }

  identity ethernet-type {
    base encapsulation-type;
    description
      "Identity for encapsulation type";
  }

  identity vlan-type {
    base encapsulation-type;
    description
      "Identity for encapsulation type";
  }

  identity protection-mode {
    description
      "Identity of protection mode";
  }

  identity oneplusone {
    base protection-mode;
    description
      "In this scheme, the primary circuit will be
       protected by a backup circuit, typically meeting certain
       diverse path/fiber/site/node criteria.  Both primary and
       protection circuits are provisioned to be in the active



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       forward ing state. The subscriber may choose to send the
       same service frames across both circuits simultaneously.";
  }

  identity one-to-one {
    base protection-mode;
    description
      "In this scheme, a backup circuit to the primary
       circuit is provisioned.  Depending on the implementation
       agreement, the protection circuits may either always be
       in active forwarding state, or may only become active when
       a faulty state is detected on the primary circuit.";
  }

  identity eth-inf-type {
    base l2vpn-svc:eth-inf-type;
    description
      "Identity of Ethernet Interface Type";
  }

  identity bw-type {
    base l2vpn-svc:bw-type;
    description
      "Identity of bandwidth";
  }

  identity site-type {
    description
      "Identity of site type.";
  }

  identity uni {
    base site-type;
    description
      "Identity of User Network Interface ";
  }

  identity enni {
    base site-type;
    description
      "Identity of External Network to Network Interface";
  }

  identity service-type {
    base l2vpn-svc:service-type;
    description
      "Base Identity of service type.";
  }



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  identity bundling-type {
    base l2vpn-svc:bundling-type;
    description
      "This is base identity for Bundling type. It supports
       multiple CE-VLAN associated with L2VPN service or all
       CE-VLANs associated with L2VPN service.";
  }

  identity color-id {
    base l2vpn-svc:color-id;
    description
      "base identity of color id";
  }

  identity cos-id {
    base l2vpn-svc:cos-id;
    description
      "Identity of class of service id";
  }

  identity color-type {
    base l2vpn-svc:color-type;
    description
      "Identity of color types";
  }

  identity perf-tier-opt {
    description
      "Identity of performance tier option.";
  }

  identity metro {
    base perf-tier-opt;
    description
      "Identity of metro";
  }

  identity regional {
    base perf-tier-opt;
    description
      "Identity of regional";
  }

  identity continental {
    base perf-tier-opt;
    description
      "Identity of continental";
  }



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  identity global {
    base perf-tier-opt;
    description
      "Identity of global";
  }

  identity policing {
    description
      "Identity of policing type";
  }

  identity one-rate-two-color {
    base policing;
    description
      "Identity of one-rate, two-color (1R2C)";
  }

  identity two-rate-three-color {
    base policing;
    description
      "Identity of two-rate, three-color (2R3C)";
  }

  identity bum-type {
    base l2vpn-svc:bum-type;
    description
      "Identity of BUM type";
  }

  identity loop-prevention-type {
    base l2vpn-svc:loop-prevention-type;
    description
      "Identity of loop prevention";
  }

  identity lacp-state {
    base l2vpn-svc:lacp-state;
    description
      "Identity of LACP state";
  }

  identity lacp-mode {
  base l2vpn-svc:lacp-mode;
    description
      "Identity of LACP mode";
  }

  identity lacp-speed {



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    base l2vpn-svc:lacp-speed;
    description
      "Identity of LACP speed";
  }

  identity vpn-signaling-type {
    description
      "Identity of VPN signaling types";
  }

  identity l2vpn-bgp {
    base vpn-signaling-type;
    description
      "Identity of l2vpn-bgp";
  }

  identity evpn-bgp {
    base vpn-signaling-type;
    description
      "Identity of evpn-bgp";
  }

  identity t-ldp {
    base vpn-signaling-type;
    description
      "Identity of t-ldp.";
  }

  identity h-vpls {
    base vpn-signaling-type;
    description
      "Identity for h-vpls";
  }

  identity l2tp {
    base vpn-signaling-type;
    description
      "Identity of l2tp.";
  }

  identity t-ldp-pwe-type {
    description
      "Identity for t-ldp-pwe-type.";
  }

  identity vpws-type {
    base t-ldp-pwe-type;
    description



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      "Identity for VPWS";
  }

  identity vpls-type {
    base t-ldp-pwe-type;
    description
      "Identity for vpls";
  }

  identity hvpls {
    base t-ldp-pwe-type;
    description
      "Identity for h-vpls";
  }

  identity l2vpn-type {
    description
      "Layer 2 VPN types";
  }

  identity l2vpn-vpws {
    base l2vpn-type;
    description
      "VPWS L2VPN type.";
  }

  identity l2vpn-vpls {
    base l2vpn-type;
    description
      "VPLS L2VPN type.";
  }

  identity distribute-vpls {
    base l2vpn-type;
    description
      "distribute VPLS L2VPN type.";
  }

  identity evpn-type {
    description
      "Ethernet VPN types";
  }

  identity evpn-vpws {
    base evpn-type;
    description
      "VPWS support in EVPN.";
  }



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  identity evpn-pbb {
    base evpn-type;
    description
      " Provider Backbone Bridging Support in EVPN.";
  }

  identity management {
    base l2vpn-svc:management;
    description
      "Base identity for site management scheme.";
  }

  identity address-family {
    base l2vpn-svc:address-family;
    description
      "Base identity for an address family.";
  }

  identity vpn-topology {
    base l3vpn-ntw:vpn-topology;
    description
      "Base identity for VPN topology.";
  }

  identity site-role {
    base l2vpn-svc:site-role;
    description
      "Base identity for site type.";
  }

  identity any-to-any-role {
    base site-role;
    description
      "Any-to-any-role site type.";
  }

  identity pm-type {
    base l2vpn-svc:pm-type;
    description
      "Performance monitor type";
  }

  identity fault-alarm-defect-type {
    base l2vpn-svc:fault-alarm-defect-type;
    description
      "Indicating the alarm priority defect";
  }




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  identity frame-delivery-mode {
   base l2vpn-svc:frame-delivery-mode;
    description
      "Delivery types";
  }

  identity pw-topo-type {
    base l2vpn-svc:site-network-access-type;
    description
      "base identity for pw topology Type";
  }

  identity placement-diversity {
   base l2vpn-svc:placement-diversity;
    description
      "Base identity for site placement
       constraints";
  }

  identity l2-access-type {
    description
      "This identify the access type
       of the vpn acccess interface";
  }

  identity untag {
    base l2-access-type;
    description
      "Untag";
  }

  identity port {
    base l2-access-type;
    description
      "Port";
  }

  identity dot1q {
    base l2-access-type;
    description
      "Qot1q";
  }

  identity qinq {
    base l2-access-type;
    description
      "QinQ";
  }



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  identity sub-interface {
    base l2-access-type;
    description
      "Create a default sub-interface and keep vlan.";
  }

  identity atm {
    base l2-access-type;
    description
      "ATM Cell.";
  }

  identity vxlan {
    base l2-access-type;
    description
      "Vxlan access into the vpn";
  }

  identity provision-model {
   base l2vpn-svc:provision-model;
    description
      "base identity for provision model.";
  }

  identity mac-learning-mode {
   base l2vpn-svc:mac-learning-mode;
    description
      "MAC learning mode";
  }

  identity vpn-policy-filter-type {
   base l2vpn-svc:vpn-policy-filter-type;
    description
      "Base identity for filter type.";
  }

  identity mac-action {
   base l2vpn-svc:mac-action;
    description
      "Base identity for MAC action.";
  }

  identity load-balance-method {
    description
      "Base identity for load balance method.";
  }

  identity fat-pw {



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    base load-balance-method;
    description
      "Identity for Fat PW. Fat label is
       applied to Pseudowires across MPLS
       network.";
  }

  identity entropy-label {
    base load-balance-method;
    description
      "Identity for entropy label.Entropy label
       is applied to IP forwarding,
       L2VPN or L3VPN across MPLS network";
  }

  identity vxlan-source-port {
    base load-balance-method;
    description
      "Identity for vxlan source port.VxLAN
       Source Port is one load balancing method.";
  }

  identity qos-profile-direction {
   base l2vpn-svc:qos-profile-direction;
    description
      "Base identity for qos profile direction.";
  }

  identity vxlan-peer-mode {
   base l2vpn-svc:vxlan-peer-mode;
    description
      "Base identity for vxlan peer mode.";
  }

  identity customer-application {
   base l2vpn-svc:customer-application;
    description
      "Base identity for customer application.";
  }

  identity precedence-type {
    description
      "Redundancy type. The service can be created
       with active and bakcup signalization.";
  }

  identity primary {
    base precedence-type;



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    description
      "Identifies the Main L2VPN.";
  }

  identity backup {
    base precedence-type;
    description
      "Identifies the Backup L2VPN.";
  }

  /* Groupings */

  grouping vpn-route-targets {
    description
      "A grouping that specifies Route Target import-export rules
       used in a BGP-enabled VPN.";
    list vpn-target {
      key "id";
      leaf id {
        type int8;
        description
          "Identifies each VPN Target";
      }
      list route-targets {
        key "route-target";
        leaf route-target {
          type rt-types:route-target;
          description
            "Route Target value";
        }
        description
          "List of Route Targets.";
      }
      leaf route-target-type {
        type rt-types:route-target-type;
        mandatory true;
        description
          "Import/export type of the Route Target.";
      }
      description
        "l3vpn route targets. AND/OR Operations are available
         based on the RTs assigment";
    }
    reference
      "RFC4364: BGP/MPLS IP Virtual Private Networks (VPNs)
       RFC4664: Framework for Layer 2 Virtual Private Networks
       (L2VPNs)";
    container vpn-policies {



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      description
        "";
      leaf import-policy {
        type string;
        description
          "Reference to a VRF import policy.";
      }
      leaf export-policy {
        type string;
        description
          "Reference to a VRF export policy.";
      }
    }
  }

  grouping svc-transport-encapsulation {
    container transport-encapsulation {
      leaf-list protocol {
        type protocol-type;
        ordered-by user;
        description
          "Protocols used to support transport";
      }
      description
        "Container for the Transport Underlay.";
    }
    description
      "This grouping defines the type of underlay transport
    for VPN service.";
  }

  grouping split-horizon-group {
    container split-horizon {
      leaf group-name {
        type string;
        description
          "group-name of the Split Horizon";
      }
      description
        "Configuration with split horizon enabled";
    }
    description
      "Configuration with split horizon enabled";
  }


  grouping svc-precedence {
    container svc-precedence {



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      leaf precedence {
        type identityref {
          base precedence-type;
        }
        description
          "Defining service redundancy in transport
           network.";
      }
      description
        "Transport netowrk precedence selector
         Primary or Secondary tunnel.";
    }
    description
      "Transport netowrk precedence selector
       Primary or Secondary tunnel.";
  }

  grouping vpn-service-cloud-access {
    container cloud-accesses {
      if-feature "cloud-access";
      list cloud-access {
        key "cloud-identifier";
        leaf cloud-identifier {
          type string;
          description
            "Identification of cloud service. Local
             admin meaning.";
        }
        choice list-flavor {
          case permit-any {
            leaf permit-any {
              type empty;
              description
                "Allow all sites.";
            }
          }
          case deny-any-except {
            leaf-list permit-site {
              type leafref {
                path "/l2vpn-ntw/sites/site/site-id";
              }
              description
                "Site ID to be authorized.";
            }
          }
          case permit-any-except {
            leaf-list deny-site {
              type leafref {



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                path "/l2vpn-ntw/sites/site/site-id";
              }
              description
                "Site ID to be denied.";
            }
          }
          description
            "Choice for cloud access policy.";
        }
        container authorized-sites {
          list authorized-site {
            key "site-id";
            leaf site-id {
              type leafref {
                path "/l2vpn-ntw/sites/site/site-id";
              }
              description
                "Site ID.";
            }
            description
              "List of authorized sites.";
          }
          description
            "Configuration of authorized sites.";
        }
        container denied-sites {
          list denied-site {
            key "site-id";
            leaf site-id {
              type leafref {
                path "/l2vpn-ntw/sites/site/site-id";
              }
              description
                "Site ID.";
            }
            description
              "List of denied sites.";
          }
          description
            "Configuration of denied sites.";
        }
        description
          "Cloud access configuration.";
      }
      description
        "Container for cloud access configurations";
    }
    description



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      "Grouping for vpn cloud definition";
  }

  grouping site-device {
    container device {
      list devices {
        key "device-id";
        leaf device-id {
          type string;
          description
            "Device ID";
        }
        leaf location {
          type leafref {
            path "/l2vpn-ntw/sites/site/locations/location/" +
                 "location-id";
          }
          description
            "Site name";
        }
        container management {
          leaf address {
            type inet:ip-address;
            description
              "Address";
          }
          leaf management-transport {
            type identityref {
              base address-family;
            }
            description
              "Transport protocol used for management.";
          }
          description
            "Container for management";
        }
        description
          "List of devices";
      }
      description
        "Devices configuration";
    }
    description
      "Device parameters for the site.";
  }

  grouping site-management {
    container management {



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      leaf type {
        type identityref {
          base management;
        }
        description
          "Management type of the connection.";
      }
      description
        "Container for management";
    }
    description
      "Grouping for management";
  }

  grouping site-vpn-policy {
    container vpn-policies {
      list vpn-policy {
        key "vpn-policy-id";
        leaf vpn-policy-id {
          type string;
          description
            "Unique identifier for the VPN policy.";
        }
        list entries {
          key "id";
          leaf id {
            type string;
            description
              "Unique identifier for the policy entry.";
          }
          container filters {
            list filter {
              key "type";
              ordered-by user;
              leaf type {
                type identityref {
                  base vpn-policy-filter-type;
                }
                description
                  "Type of VPN Policy filter.";
              }

              description
                "List of filters used on the site. This list can
                 be augmented.";
            }
            description
              "If a more-granular VPN attachment is necessary,



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               filtering can be used. If used, it permits the
               splitting of site LANs among multiple VPNs. The
               Site LAN can be split based on either LAN-tag
               or LAN prefix. If no filter is used, all the LANs
               will be part of the same VPNs with the same role.";
          }
          list vpn {
            key "vpn-id";
            leaf vpn-id {
              type leafref {
                path "/l2vpn-ntw/vpn-services/"
                   + "vpn-service/vpn-id";
              }
              mandatory true;
              description
                "Reference to an IP VPN.";
            }
            leaf site-role {
              type identityref {
                base site-role;
              }
              default "any-to-any-role";
              description
                "Role of the site in the IP VPN.";
            }
            description
              "List of VPNs the LAN is associated with.";
          }
          description
            "List of entries for export policy.";
        }
        description
          "List of VPN policies.";
      }
      description
        "VPN policy.";
    }
    description
      "VPN policy parameters for the site.";
  }

  grouping bum-frame-delivery {
    container bum-frame-delivery-modes {
      list bum-frame-delivery {
        key "traffic-type";
        leaf traffic-type {
          type identityref {
            base tf-type;



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          }
          description
            "Type of frame delivery. It support unicast
             frame delivery, multicast frame delivery
             and broadcast frame delivery.";
        }
        leaf delivery-mode {
          type identityref {
            base frame-delivery-mode;
          }
          description
            " Define Frame Delivery Mode
             (unconditional[default], conditional, or discard).";
        }
        description
          "List of frame delivery type and mode.";
      }
      description
        "Define frame delivery type and mode.";
    }
    description
      "Grouping for unicast, mulitcast, broadcast frame delivery";
  }

  grouping cvlan-svc-map-grouping {
    list cvlan-id-to-svc-map {
      key "svc-id";
      leaf svc-id {
        type leafref {
          path "/l2vpn-ntw/vpn-services/vpn-service/vpn-id";
        }
        description
          "VPN Service identifier";
      }
      list cvlan-id {
        key "vid";
        leaf vid {
          type uint32;
          description
            "CVLAN ID";
        }
        description
          "List of CVLAN-ID to SVC Map configurations";
      }
      description
        "List for cvlan-id to L2VPn Service map configurations";
    }
    description



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      "Grouping for cvlan to L2VPN service mapping";
  }

  grouping customer-location-info {
    container locations {
      list location {
        key "location-id";
        leaf location-id {
          type string;
          description
            "Location ID";
        }
        leaf address {
          type string;
          description
            "Address (number and street) of the site.";
        }
        leaf zip-code {
          type string;
          description
            "ZIP code of the site.";
        }
        leaf state {
          type string;
          description
            "State of the site. This leaf can also be used to
             describe a region for country who does not have
             states.";
        }
        leaf city {
          type string;
          description
            "City of the site.";
        }
        leaf country-code {
          type string;
          description
            "Country of the site.";
        }
        description
          "List for location";
      }
      description
        "Location of the site.";
    }
    description
      "This grouping defines customer location parameters";
  }



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  grouping site-diversity {
    container site-diversity {
      if-feature "site-diversity";
      container groups {
        list group {
          key "group-id";
          leaf group-id {
            type string;
            description
              "Group-id the site is belonging to";
          }
          description
            "List of group-id";
        }
        description
          "Groups the site is belonging to.
           All site network accesses will inherit those group
           values.";
      }
      description
        "Diversity constraint type.";
    }
    description
      "This grouping defines site diversity parameters";
  }

  grouping site-service {
    description
      "This grouping defines site service parameters";
  }

  grouping vpn-service-multicast {
    container multicast-like {
      if-feature "multicast-like";
      leaf enabled {
        type boolean;
        default "false";
        description
          "Enables multicast.";
      }
      container customer-tree-flavors {
        leaf-list tree-flavor {
          type identityref {
            base multicast-tree-type;
          }
          description
            "Type of tree to be used.";
        }



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        description
          "Type of trees used by customer.";
      }

      uses bum-frame-delivery;
      leaf multicast-gp-port-mapping {
        type identityref {
          base mapping-type;
        }
        description
          "Describe the way in which each interface is associated
           with the Multicast group";
      }
      description
        "Multicast global parameters for the VPN service.";
    }
    description
      "Grouping for multicast VPN definition.";
  }

  grouping vpn-extranet {
    container extranet-vpns {
      if-feature "extranet-vpn";
      list extranet-vpn {
        key "vpn-id";
        leaf vpn-id {
          type svc-id;
          description
            "Identifies the target VPN.";
        }
        leaf local-sites-role {
          type identityref {
            base site-role;
          }
          default "any-to-any-role";
          description
            "This describes the role of the
             local sites in the target VPN topology.";
        }
        description
          "List of extranet VPNs the local VPN is attached to.";
      }
      description
        "Container for extranet VPN configuration.";
    }
    description
      "Grouping for extranet VPN configuration.
       This provides an easy way to interconnect



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       all sites from two VPNs.";
  }

  grouping signaling-options-grouping {
    list signaling-options {
      key "type";
      leaf type {
        type identityref {
          base vpn-signaling-type;
        }
        description
          "VPN signaling types";
      }
      container l2vpn-bgp {
        when "/l2vpn-ntw/vpn-services/vpn-service/vpn-nodes/vpn-node/signaling-options/type = 'l2vpn-ntw:l2vpn-bgp'" {
          description
            "Only applies when vpn signaling type is l2vpn
             BGP protocol.";
        }
        leaf vpn-id {
          type leafref {
            path "/l2vpn-ntw/vpn-services/vpn-service/vpn-id";
          }
          description
            "Identifies the target VPN";
        }
        leaf type {
          type identityref {
            base l2vpn-type;
          }
          description
            "L2VPN types";
        }
        leaf pwe-encapsulation-type {
          type identityref {
            base pwe-encapsulation-type;
          }
          description
            "PWE Encapsulation Type";
        }
        uses vpn-route-targets;
        container pwe-mtu {
          leaf allow-mtu-mismatch {
            type boolean;
            description
              "Allow MTU mismatch";
          }
          description



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            "Container of PWE MTU configurations";
        }
        leaf address-family {
          type identityref {
            base address-family;
          }
          description
            "Address family used for management.";
        }
        description
          "Container for MP BGP L2VPN";
      }
      container evpn-bgp {
        when "/l2vpn-ntw/vpn-services/vpn-service/vpn-nodes/vpn-node/signaling-options/type = 'l2vpn-ntw:evpn-bgp'" {
          description
            "Only applies when vpn signaling type is EVPN
             BGP protocol.";
        }
        leaf vpn-id {
          type leafref {
            path "/l2vpn-ntw/vpn-services/vpn-service/vpn-id";
          }
          description
            "Identifies the target EVPN";
        }
        leaf type {
          type identityref {
            base evpn-type;
          }
          description
            "L2VPN types";
        }
        leaf address-family {
          type identityref {
            base address-family;
          }
          description
            "Address family used for management.";
        }
        leaf mac-learning-mode {
          type identityref {
            base mac-learning-mode;
          }
          description
            "Indicates through which plane MAC addresses are
             advertised.";
        }
        leaf arp-suppress {



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          type boolean;
          default "false";
          description
            "Indicates whether to suppress ARP broadcast.";
        }
        description
          "Container for MP BGP L2VPN";
      }
      container t-ldp-pwe {
        when "/l2vpn-ntw/vpn-services/vpn-service/vpn-nodes/vpn-node/signaling-options/type = 'l2vpn-ntw:t-ldp'" {
          description
            "Only applies when vpn signaling type is Target LDP.";
        }
        leaf type {
          type identityref {
            base t-ldp-pwe-type;
          }
          description
            "T-LDP PWE type";
        }
        leaf pwe-encapsulation-type {
          type identityref {
            base pwe-encapsulation-type;
          }
          description
            "PWE Encapsulation Type.";
        }
        leaf control-word {
          type boolean;
          description
            "Control word configurations";
        }
        container pwe-mtu {
          leaf allow-mtu-mismatch {
            type boolean;
            description
              "Allow MTU mismatch";
          }
          description
            "Container of PWE MTU configurations";
        }
        leaf provision-mode {
          type identityref {
            base provision-model;
          }
          description
            "provision-models. It support Double-Sided Provisioning
             model or single-side provisioning model.";



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        }
        list ac-pw-list {
          key "peer-addr vc-id";
          leaf peer-addr {
            type inet:ip-address;
            description
              "Peer IP address.";
          }
          leaf vc-id {
            type string;
            description
              "VC lable used to identify PW.";
          }
          leaf pw-type {
            type identityref {
              base pw-topo-type;
            }
            description
              "PW topology type";
          }
          leaf pw-priority {
            type uint32;
            description
              "Defines the priority for the PW.
               The higher the pw-priority value,
               the higher the preference of the PW will be.";
          }
          description
            "List of AC and PW bindings.";
        }
        container qinq {
          when "/l2vpn-ntw/vpn-services/vpn-service/vpn-nodes/vpn-node/signaling-options/type = 'l2vpn-ntw:h-vpls'" {
            description
              "Only applies when t-ldp pwe type is h-vpls.";
          }
          leaf s-tag {
            type uint32;
            description
              "S-TAG";
          }
          leaf c-tag {
            type uint32;
            description
              "C-TAG";
          }
          description
            "Container for QinQ";
        }



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        description
          "Container of T-LDP PWE configurations";
      }
      container l2tp-pwe {
        when "/l2vpn-ntw/vpn-services/vpn-service/vpn-nodes/vpn-node/signaling-options/type = 'l2vpn-ntw:l2tp'" {
          description
            "Applies when vpn signaling type is L2TP protocol.";
        }
        leaf type {
          type identityref {
            base t-ldp-pwe-type;
          }
          description
            "T-LDP PWE type";
        }
        leaf encapsulation-type {
          type identityref {
            base encapsulation-type;
          }
          description
            "Encapsulation type";
        }
        leaf control-word {
          type boolean;
          description
            "Control word configurations";
        }
        list ac-pw-list {
          key "peer-addr vc-id";
          leaf peer-addr {
            type inet:ip-address;
            description
              "Peer IP address.";
          }
          leaf vc-id {
            type string;
            description
              "VC lable used to identify PW.";
          }

          leaf pw-type {
            type identityref {
              base pw-topo-type;
            }
            description
              "PW topology type";
          }
          leaf pw-priority {



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            type uint32;
            description
              "PW priority";
          }
          description
            "List of AC and PW bindings.";
        }
        description
          "Container for l2tp pw";
      }
      description
        "List of VPN Signaling Option.";
    }
    description
      "Grouping for signaling option";
  }

  grouping operational-requirements-ops {
    leaf actual-site-start {
      type yang:date-and-time;
      config false;
      description
        "Optional leaf indicating actual date
         and time when the service at a particular
         site actually started";
    }
    leaf actual-site-stop {
      type yang:date-and-time;
      config false;
      description
        "Optional leaf indicating actual date
         and time when the service at a particular
         site actually stopped";
    }
    leaf bundling-type {
      type identityref {
        base bundling-type;
      }
      description
        "Bundling type";
    }
    leaf default-ce-vlan-id {
      type uint32;
      description
        "Default CE VLAN ID set at site level.";
    }
    description
      "This grouping defines some operational parameters



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       parameters";
  }

  grouping cfm-802-grouping {
    leaf maid {
      type string;
      description
        "MA ID";
    }
    leaf mep-id {
      type uint32;
      description
        "Local MEP ID";
    }
    leaf mep-level {
      type uint32;
      description
        "MEP level";
    }
    leaf mep-up-down {
      type enumeration {
        enum up {
          description
            "MEP up";
        }
        enum down {
          description
            "MEP down";
        }
      }
      description
        "MEP up/down";
    }
    leaf remote-mep-id {
      type uint32;
      description
        "Remote MEP ID";
    }
    leaf cos-for-cfm-pdus {
      type uint32;
      description
        "COS for CFM PDUs";
    }
    leaf ccm-interval {
      type uint32;
      description
        "CCM interval";
    }



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    leaf ccm-holdtime {
      type uint32;
      description
        "CCM hold time";
    }
    leaf alarm-priority-defect {
      type identityref {
        base fault-alarm-defect-type;
      }
      description
        "The lowest priority defect that is
         allowed to generate a Fault Alarm.
         The non-existence of this leaf means
         that no defects are to be reported";
    }
    leaf ccm-p-bits-pri {
      type ccm-priority-type;
      description
        "The priority parameter for CCMs transmitted by the MEP";
    }
    description
      "Grouping for 802.1ag CFM attribute";
  }

  grouping y-1731 {
    list y-1731 {
      key "maid";
      leaf maid {
        type string;
        description
          "MA ID ";
      }
      leaf mep-id {
        type uint32;
        description
          "Local MEP ID";
      }
      leaf type {
        type identityref {
          base pm-type;
        }
        description
          "Performance monitor types";
      }
      leaf remote-mep-id {
        type uint32;
        description
          "Remote MEP ID";



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      }
      leaf message-period {
        type uint32;
        description
          "Defines the interval between OAM messages. The message
           period is expressed in milliseconds";
      }
      leaf measurement-interval {
        type uint32;
        description
          "Specifies the measurement interval for statistics. The
           measurement interval is expressed in seconds";
      }
      leaf cos {
        type uint32;
        description
          "Class of service";
      }
      leaf loss-measurement {
        type boolean;
        description
          "Whether enable loss measurement";
      }
      leaf synthethic-loss-measurement {
        type boolean;
        description
          "Indicate whether enable synthetic loss measurement";
      }
      container delay-measurement {
        leaf enable-dm {
          type boolean;
          description
            "Whether to enable delay measurement";
        }
        leaf two-way {
          type boolean;
          description
            "Whether delay measurement is two-way (true) of one-
             way (false)";
        }
        description
          "Container for delay measurement";
      }
      leaf frame-size {
        type uint32;
        description
          "Frame size";
      }



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      leaf session-type {
        type enumeration {
          enum proactive {
            description
              "Proactive mode";
          }
          enum on-demand {
            description
              "On demand mode";
          }
        }
        description
          "Session type";
      }
      description
        "List for y-1731.";
    }
    description
      "Grouping for y.1731";
  }

  grouping enni-site-info-grouping {
    container site-info {
      leaf site-name {
        type string;
        description
          "Site name";
      }
      leaf address {
        type inet:ip-address;
        description
          "Address";
      }
      leaf Edge-Gateway-Device-Info {
        type string;
        description
          "Edge Gateway Device Info ";
      }
      description
        "Container of site info configurations";
    }
    description
      "Grouping for site information";
  }

  grouping acl-grouping {
    container access-control-list {
      list mac {



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        key "mac-address";
        leaf mac-address {
          type yang:mac-address;
          description
            "MAC address.";
        }
        description
          "List for MAC.";
      }
      description
        "Container for access control List.";
    }
    description
      "This grouping defines Access Control List.";
  }

  grouping lacp-grouping {
    container lacp {
      leaf lacp-state {
        type boolean;
        description
          "LACP on/off";
      }
      leaf lacp-mode {
        type boolean;
        description
          "LACP mode";
      }
      leaf lacp-speed {
        type boolean;
        description
          "LACP speed";
      }
      leaf mini-link {
        type uint32;
        description
          "The minimum aggregate bandwidth for a LAG";
      }
      leaf system-priority {
        type uint16;
        description
          "Indicates the LACP priority for the system.
           The range is from 0 to 65535.
           The default is 32768.";
      }
      container micro-bfd {
        if-feature "micro-bfd";
        leaf micro-bfd-on-off {



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          type enumeration {
            enum on {
              description
                "Micro-bfd on";
            }
            enum off {
              description
                "Micro-bfd off";
            }
          }
          description
            "Micro BFD ON/OFF";
        }
        leaf bfd-interval {
          type uint32;
          description
            "BFD interval";
        }
        leaf bfd-hold-timer {
          type uint32;
          description
            "BFD hold timer";
        }
        description
          "Container of Micro-BFD configurations";
      }
      container bfd {
        if-feature "bfd";
        leaf bfd-enabled {
          type boolean;
          description
            "BFD activation";
        }
        choice holdtime {
          case profile {
            leaf profile-name {
              type string;
              description
                "Service provider well known profile.";
            }
            description
              "Service provider well known profile.";
          }
          case fixed {
            leaf fixed-value {
              type uint32;
              units "msec";
              description



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                "Expected hold time expressed in msec.";
            }
          }
          description
            "Choice for hold time flavor.";
        }
        description
          "Container for BFD.";
      }
      container member-link-list {
        list member-link {
          key "name";
          leaf name {
            type string;
            description
              "Member link name";
          }
          leaf port-speed {
            type uint32;
            description
              "Port speed";
          }
          leaf mode {
            type neg-mode;
            description
              "Negotiation mode";
          }
          leaf link-mtu {
            type uint32;
            description
              "Link MTU size.";
          }
          container oam-802.3ah-link {
            if-feature "oam-3ah";
            leaf enable {
              type boolean;
              description
                "Indicate whether support oam 802.3 ah link";
            }
            description
              "Container for oam 802.3 ah link.";
          }
          description
            "Member link";
        }
        description
          "Container of Member link list";
      }



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      leaf flow-control {
        type string;
        description
          "Flow control";
      }
      leaf lldp {
        type boolean;
        description
          "LLDP";
      }
      description
        "LACP";
    }
    description
      "Grouping for lacp";
  }

  grouping phy-interface-grouping {
    container phy-interface {
      leaf port-number {
        type uint32;
        description
          "Port number";
      }
      leaf port-speed {
        type uint32;
        description
          "Port speed";
      }
      leaf mode {
        type neg-mode;
        description
          "Negotiation mode";
      }
      leaf phy-mtu {
        type uint32;
        description
          "PHY MTU";
      }
      leaf flow-control {
        type string;
        description
          "Flow control";
      }
      leaf physical-if {
        type string;
        description
          "Physical interface";



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      }
      leaf circuit-id {
        type string;
        description
          "Circuit ID";
      }
      leaf lldp {
        type boolean;
        description
          "LLDP";
      }
      container oam-802.3ah-link {
        if-feature "oam-3ah";
        leaf enable {
          type boolean;
          description
            "Indicate whether support oam 802.3 ah link";
        }
        description
          "Container for oam 802.3 ah link.";
      }
      leaf uni-loop-prevention {
        type boolean;
        description
          "If this leaf set to truth that the port automatically
           goes down when a physical loopback is detect.";
      }
      description
        "Container of PHY Interface Attributes configurations";
    }
    description
      "Grouping for phy interface.";
  }

  grouping lag-interface-grouping {
    container lag-interface {
      if-feature "lag-interface";
      list lag-interface {
        key "lag-interface-number";
        leaf lag-interface-number {
          type uint32;
          description
            "LAG interface number";
        }
        uses lacp-grouping;
        description
          "List of LAG interfaces";
      }



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      description
        "Container of LAG interface attributes configuration";
    }
    description
      "Grouping for LAG interface";
  }

  grouping dot1q-interface-grouping {
    container dot1q-interface {
      leaf l2-access-type {
        type identityref {
          base l2-access-type;
        }
        description
          "L2 Access Encapsulation Type";
      }
      container dot1q {
        when "'../l2-access-type'='dot1q'";
        if-feature "dot1q";
        leaf physical-inf {
          type string;
          description
            "Physical Interface";
        }
        leaf c-vlan-id {
          type uint32;
          description
            "VLAN identifier";
        }
        description
          "Qot1q";
      }
      container sub-inf {
        when "'../l2-access-type'='sub-interface'";
        if-feature "sub-inf";
        leaf interface-description {
          type string;
          description
            "Interface description";
        }
        leaf sub-if-id {
          type uint32;
          description
            "Sub interface ID";
        }
        description
          "sub interface";
      }



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      container qinq {
        when "'../l2-access-type'='qinq'";
        if-feature "qinq";
        leaf s-vlan-id {
          type uint32;
          description
            "S-VLAN Identifier";
        }
        leaf c-vlan-id {
          type uint32;
          description
            "C-VLAN Identifier";
        }
        description
          "QinQ";
      }
      container qinany {
        if-feature "qinany";
        leaf s-vlan-id {
          type uint32;
          description
            "S-Vlan ID";
        }
        description
          "Container for Q in Any";
      }
      container atm {
        when "'../l2-access-type'='atm'";
        if-feature "atm";
        leaf vpi {
          type uint32;
          description
            "VPI Identifier";
        }
        leaf vci {
          type uint32;
          description
            "VCI Identifier";
        }
        description
          "ATM Cell.";
      }
      container vxlan {
        when "'../l2-access-type'='vxlan'";
        if-feature "vxlan";
        leaf vni-id {
          type uint32;
          description



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            "VNI Identifier";
        }
        leaf peer-mode {
          type identityref {
            base vxlan-peer-mode;
          }
          description
            "specify the vxlan access mode";
        }
        list peer-list {
          key "peer-ip";
          leaf peer-ip {
            type inet:ip-address;
            description
              "Peer IP";
          }
          description
            "List for peer IP";
        }
        description
          "QinQ";
      }
      description
        "Container for dot1Q Interface";
    }
    description
      "Grouping for Layer2 access";
  }

  grouping ethernet-connection-grouping {
    container connection {
      leaf port-id {
          type string;
          description
            "Reference to the Port-id.
             The semantic of the Port-Id depends on the vendor's
             semantic. i.e ge-X/Y/Z , xe-X/Y/Z , et-X/Y/Z,AeXXX.YYY,
             aeXXX,GigabitEthernetX/Y/Z";
        }

      leaf encapsulation-type {
        type identityref {
          base encapsulation-type;
        }
        description
          "Encapsulation Type";
      }
      leaf-list eth-inf-type {



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        type identityref {
          base eth-inf-type;
        }
        description
          "Ethernet Interface Type";
      }
      uses dot1q-interface-grouping;
      uses phy-interface-grouping;
      uses lag-interface-grouping;
      uses cvlan-svc-map-grouping;
      uses split-horizon-group;
      uses l2cp-grouping;
      description
        "Container for bearer";
    }
    description
      "Grouping for bearer.";
  }

  grouping svc-mtu-grouping {
    leaf svc-mtu {
      type uint32;
      description
        "SVC MTU, it is also known as the maximum transmission unit
         or maximum frame size,When a frame is larger than the MTU,
         it is broken down, or fragmented, into smaller pieces by the
         network protocol to accommodate the MTU of the network";
    }
    description
      "Grouping for service mtu.";
  }

  grouping svc-preservation-grouping {
    leaf ce-vlan-preservation {
      type boolean;
      description
        "Preserve the CE-VLAN ID from ingress to egress,i.e.,
         CE-VLAN tag of the egress frame are identical to
         those of the ingress frame that yielded this egress
         service frame. If All-to-One bundling within a site
         is Enabled, then preservation applies to all Ingress
         service frames. If All-to-One bundling is Disabled,
         then preservation applies to tagged Ingress service
         frames having CE-VLAN ID 1 through 4094.";
    }
    leaf ce-vlan-cos-perservation {
      type boolean;
      description



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        "CE vlan CoS preservation. PCP bits in the CE-VLAN tag
         of the egress frame are identical to those of the ingress
         frame that yielded this egress service frame.";
    }
    description
      "Grouping for service preservation.";
  }

  grouping mac-addr-limit-grouping {
    container mac-addr-limit {
      leaf mac-num-limit {
        type uint16;
        description
          "maximum number of MAC addresses learned from
           the subscriber for a single service instance.";
      }
      leaf time-interval {
        type uint32;
        units "milliseconds";
        description
          "The aging time of the mac address.";
      }
      leaf action {
        type identityref {
          base mac-action;
        }
        description
          "specify the action when the upper limit is
           exceeded: drop the packet, flood the
           packet, or simply send a warning log message.";
      }
      description
        "Container of MAC-Addr limit configurations";
    }
    description
      "Grouping for mac address limit";
  }

  grouping availability-grouping {
    container availability {
      leaf access-priority {
        type uint32;
        description
          "Access priority";
      }
      choice redundancy-mode {
        case single-active {
          leaf single-active {



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            type boolean;
            description
              "Single active";
          }
          description
            "Single active case";
        }
        case all-active {
          leaf all-active {
            type boolean;
            description
              "All active";
          }
          description
            "All active case";
        }
        description
          "Redundancy mode choice";
      }
      description
        "Container of availability optional configurations";
    }
    description
      "Grouping for availability";
  }

  grouping l2cp-grouping {
    container l2cp-control {
      if-feature "l2cp-control";
      leaf stp-rstp-mstp {
        type control-mode;
        description
          "STP/RSTP/MSTP protocol type applicable to all UNIs";
      }
      leaf pause {
        type control-mode;
        description
          "Pause protocol type applicable to all UNIs";
      }
      leaf lacp-lamp {
        type control-mode;
        description
          "LACP/LAMP  ";
      }
      leaf link-oam {
        type control-mode;
        description
          "Link OAM";



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      }
      leaf esmc {
        type control-mode;
        description
          "ESMC";
      }
      leaf l2cp-802.1x {
        type control-mode;
        description
          "802.x";
      }
      leaf e-lmi {
        type control-mode;
        description
          "E-LMI";
      }
      leaf lldp {
        type boolean;
        description
          "LLDP protocol type applicable to all UNIs";
      }
      leaf ptp-peer-delay {
        type control-mode;
        description
          "PTP peer delay";
      }
      leaf garp-mrp {
        type control-mode;
        description
          "GARP/MRP";
      }
      description
        "Container of L2CP control configurations";
    }
    description
      "Grouping for l2cp control";
  }

  grouping B-U-M-grouping {
    container broadcast-unknown-unicast-multicast {
      leaf multicast-site-type {
        type enumeration {
          enum receiver-only {
            description
              "The site only has receivers.";
          }
          enum source-only {
            description



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              "The site only has sources.";
          }
          enum source-receiver {
            description
              "The site has both sources and receivers.";
          }
        }
        default "source-receiver";
        description
          "Type of multicast site.";
      }
      list multicast-gp-address-mapping {
        key "id";
        leaf id {
          type uint16;
          description
            "Unique identifier for the mapping.";
        }
        leaf vlan-id {
          type uint32;
          description
            "the VLAN ID of the Multicast group";
        }
        leaf mac-gp-address {
          type yang:mac-address;
          description
            "the MAC address of the Multicast group";
        }
        leaf port-lag-number {
          type uint32;
          description
            "the ports/LAGs belonging to the Multicast group";
        }
        description
          "List of Port to group mappings.";
      }
      leaf bum-overall-rate {
        type uint32;
        description
          "overall rate for BUM";
      }
      list bum-rate-per-type {
        key "type";
        leaf type {
          type identityref {
            base bum-type;
          }
          description



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            "BUM type";
        }
        leaf rate {
          type uint32;
          description
            "rate for BUM";
        }
        description
          "List of rate per type";
      }
      description
        "Container of broadcast, unknown unicast, and multicast
         configurations";
    }
    description
      "Grouping for broadcast, unknown unicast, and multicast ";
  }

  grouping mac-loop-prevention-grouping {
    container mac-loop-prevention {
      leaf frequency {
        type uint32;
        description
          "Frequency";
      }
      leaf protection-type {
        type identityref {
          base loop-prevention-type;
        }
        description
          "Protection type";
      }
      leaf number-retries {
        type uint32;
        description
          "Number of retries";
      }
      description
        "Container of MAC loop prevention.";
    }
    description
      "Grouping for MAC loop prevention";
  }

  grouping ethernet-svc-oam-grouping {
    container ethernet-service-oam {
      leaf md-name {
        type string;



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        description
          "Maintenance domain name";
      }
      leaf md-level {
        type uint8;
        description
          "Maintenance domain level";
      }
      container cfm-802.1-ag {
        list n2-uni-c {
          key "maid";
          uses cfm-802-grouping;
          description
            "List of UNI-N to UNI-C";
        }
        list n2-uni-n {
          key "maid";
          uses cfm-802-grouping;
          description
            "List of UNI-N to UNI-N";
        }
        description
          "Container of 802.1ag CFM configurations.";
      }
      uses y-1731;
      description
        "Container for Ethernet service OAM.";
    }
    description
      "Grouping for Ethernet service OAM.";
  }

  grouping fate-sharing-group {
    container groups {
      leaf fate-sharing-group-size {
        type uint16;
        description
          "Fate sharing group size.";
      }
      leaf group-color {
        type string;
        description
          "Group color associated with a particular VPN.";
      }
      list group {
        key "group-id";
        leaf group-id {
          type string;



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          description
            "Group-id the site network access
             is belonging to";
        }
        description
          "List of group-id";
      }
      description
        "Groups the fate sharing group member
         is belonging to";
    }
    description
      "Grouping for Fate sharing group.";
  }

  grouping site-group {
    container groups {
      list group {
        key "group-id";
        leaf group-id {
          type string;
          description
            "Group-id the site is belonging to";
        }
        description
          "List of group-id";
      }
      description
        "Groups the site or vpn-network-access
         is belonging to.";
    }
    description
      "Grouping definition to assign
       group-ids to site or vpn-network-access";
  }

  grouping access-diversity {
    container access-diversity {
      if-feature "site-diversity";
      uses fate-sharing-group;
      container constraints {
        list constraint {
          key "constraint-type";
          leaf constraint-type {
            type identityref {
              base placement-diversity;
            }
            description



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              "Diversity constraint type.";
          }
          container target {
            choice target-flavor {
              case id {
                list group {
                  key "group-id";
                  leaf group-id {
                    type string;
                    description
                      "The constraint will apply
                       against this particular
                       group-id";
                  }
                  description
                    "List of groups";
                }
              }
              case all-accesses {
                leaf all-other-accesses {
                  type empty;
                  description
                    "The constraint will apply
                     against all other site network
                     access of this site";
                }
              }
              case all-groups {
                leaf all-other-groups {
                  type empty;
                  description
                    "The constraint will apply
                     against all other groups the
                     customer is managing";
                }
              }
              description
                "Choice for the group definition";
            }
            description
              "The constraint will apply against
               this list of groups";
          }
          description
            "List of constraints";
        }
        description
          "Constraints for placing this site



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            network access";
      }
      description
        "Diversity parameters.";
    }
    description
      "This grouping defines access diversity
       parameters";
  }

  grouping request-type-profile-grouping {
    container request-type-profile {
      choice request-type-choice {
        case dot1q-case {
          container dot1q {
            leaf physical-if {
              type string;
              description
                "Physical interface";
            }
            leaf vlan-id {
              type uint16;
              description
                "VLAN ID";
            }
            description
              "Container for dot1q.";
          }
          description
            "Case for dot1q";
        }
        case physical-case {
          leaf physical-if {
            type string;
            description
              "Physical interface";
          }
          leaf circuit-id {
            type string;
            description
              "Circuit ID";
          }
          description
            "Physical case";
        }
        description
          "Choice for request type";
      }



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      description
        "Container for request type profile.";
    }
    description
      "Grouping for request type profile";
  }

  grouping site-attachment-bearer {
    container bearer {
      container requested-type {
        if-feature "requested-type";
        leaf requested-type {
          type string;
          description
            "Type of requested bearer Ethernet, ATM, Frame
             Relay, IP Layer 2 Transport, Frame Relay DLCI,
             SONET/SDH,PPP.";
        }
        leaf strict {
          type boolean;
          default "false";
          description
            "Define if the requested-type is a preference
             or a strict requirement.";
        }
        description
          "Container for requested type.";
      }
      leaf always-on {
        if-feature "always-on";
        type boolean;
        default "true";
        description
          "Request for an always on access type.
           This means no Dial access type for
           example.";
      }
      leaf bearer-reference {
        if-feature "bearer-reference";
        type string;
        description
          "This is an internal reference for the
           service provider.";
      }
      description
        "Bearer specific parameters.
         To be augmented.";
    }



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    description
      "Grouping to define physical properties of
       a site attachment.";
  }

  grouping vpn-attachment-grouping {
    container vpn-attachment {
      leaf device-id {
        type string;
        description
          "Device ID";
      }
      container management {
        leaf address-family {
          type identityref {
            base address-family;
          }
          description
            "Address family used for management.";
        }
        leaf address {
          type inet:ip-address;
          description
            "Management address";
        }
        description
          "Management configuration..";
      }
      choice attachment-flavor {
        case vpn-flavor {
          list vpn-flavor {
            key "vpn-id";
            leaf vpn-id {
              type leafref {
                path "/l2vpn-ntw/vpn-services"
                   + "/vpn-service/vpn-id";
              }
              description
                "Reference to a VPN.";
            }
            leaf site-role {
              type identityref {
                base site-role;
              }
              default "any-to-any-role";
              description
                "Role of the site in the IPVPN.";
            }



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            description
              "List of IPVPNs attached by the Site Network Access";
          }
        }
        case vpn-policy-id {
          leaf vpn-policy-id {
            type leafref {
              path "/l2vpn-ntw/sites/site/vpn-policies/vpn-policy/"+
              "vpn-policy-id";
            }
            description
              "Reference to a vpn policy";
          }
        }
        mandatory true;
        description
          "Choice for VPN attachment flavor.";
      }
      description
        "Defines VPN attachment of a site.";
    }
    description
      "Grouping for access attachment";
  }

  grouping site-service-basic {
    container svc-input-bandwidth {
      if-feature "input-bw";
      list input-bandwidth {
        key "type";
        leaf type {
          type identityref {
            base bw-type;
          }
          description
            "Bandwidth Type";
        }
        leaf cos-id {
          type uint8;
          description
            "Identifier of Class of Service
             , indicated by DSCP or a CE-CLAN
             CoS(802.1p)value in the service frame.";
        }
        leaf vpn-id {
          type svc-id;
          description
            "Identifies the target VPN.";



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        }
        leaf cir {
          type uint64;
          description
            "Committed Information Rate. The maximum number of
             bits that a port can receive or send during
             one-second over an interface.";
        }
        leaf cbs {
          type uint64;
          description
            "Committed Burst Size.CBS controls the bursty nature
             of the traffic. Traffic that does not use the
             configured CIR accumulates credits until the credits
             reach the configured CBS.";
        }
        leaf eir {
          type uint64;
          description
            "Excess Information Rate,i.e.,Excess frame delivery
             allowed not subject to SLA.The traffic rate can be
             limited by eir.";
        }
        leaf ebs {
          type uint64;
          description
            "Excess Burst Size. The bandwidth available for burst
             traffic from the EBS is subject to the amount of
             bandwidth that is accumulated during periods when
             traffic allocated by the EIR policy is not used.";
        }
        leaf pir {
          type uint64;
          description
            "Peak Information Rate, i.e., maixmum frame delivery
             allowed. It is equal to or less than sum of cir and
             eir.";
        }
        leaf pbs {
          type uint64;
          description
            "Peak Burst Size. It is measured in bytes per second.";
        }
        description
          "List for input bandwidth";
      }
      description
        "From the PE perspective, the service input



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         bandwidth of the connection.";
    }
    container svc-output-bandwidth {
      if-feature "output-bw";
      list output-bandwidth {
        key "type";
        leaf type {
          type identityref {
            base bw-type;
          }
          description
            "Bandwidth Type";
        }
        leaf cos-id {
          type uint8;
          description
            "Identifier of Class of Service
             , indicated by DSCP or a CE-CLAN
             CoS(802.1p)value in the service frame.";
        }
        leaf vpn-id {
          type svc-id;
          description
            "Identifies the target VPN.";
        }
        leaf cir {
          type uint64;
          description
            "Committed Information Rate. The maximum number of
             bits that a port can receive or send during
             one-second over an interface.";
        }
        leaf cbs {
          type uint64;
          description
            "Committed Burst Size.CBS controls the bursty nature
             of the traffic. Traffic that does not use the
             configured CIR accumulates credits until the credits
             reach the configured CBS.";
        }
        leaf eir {
          type uint64;
          description
            "Excess Information Rate,i.e.,Excess frame delivery
             allowed not subject to SLA.The traffic rate can be
             limited by eir.";
        }
        leaf ebs {



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          type uint64;
          description
            "Excess Burst Size. The bandwidth available for burst
             traffic from the EBS is subject to the amount of
             bandwidth that is accumulated during periods when
             traffic allocated by the EIR policy is not used.";
        }
        leaf pir {
          type uint64;
          description
            "Peak Information Rate, i.e., maixmum frame delivery
             allowed. It is equal to or less than sum of cir and
             eir.";
        }
        leaf pbs {
          type uint64;
          description
            "Peak Burst Size. It is measured in bytes per second.";
        }
        description
          "List for output bandwidth";
      }
      description
        "From the PE perspective, the service output
         bandwidth of the connection.";
    }
    description
      "Grouping for site service";
  }

  grouping flow-definition {
    container match-flow {
      leaf dscp {
        type inet:dscp;
        description
          "DSCP value.";
      }
      leaf dot1q {
        type uint32;
        description
          "802.1q matching. It is VLAN Tag added into frame.";
      }
      leaf pcp {
        type uint8 {
          range "0 .. 7";
        }
        description
          "PCP value";



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      }

      uses pf:acl-eth-header-fields;
      leaf color-type {
        type identityref {
          base color-type;
        }
        description
          "Color Types";
      }
      leaf-list target-sites {
        type svc-id;
        description
          "Identify a site as traffic destination.";
      }
      leaf any {
        type empty;
        description
          "Allow all.";
      }
      leaf vpn-id {
        type svc-id;
        description
          "Reference to the target VPN.";
      }
      description
        "Describe flow matching criteria.";
    }
    description
      "Flow definition based on criteria.";
  }

  grouping services-grouping {
    container service {
      uses site-service-qos-profile;
      description
        "Container for service";
    }
    description
      "Grouping for Services";
  }

  grouping service-grouping {
    container service {
      uses site-service-basic;
      uses site-service-qos-profile;
      uses svc-precedence;
      description



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        "Container for service";
    }
    description
      "Grouping for service.";
  }

  grouping site-service-qos-profile {
    container qos {
      if-feature "qos";
      container classification-policy {
        list rule {
          key "id";
          ordered-by user;
          leaf id {
            type string;
            description
              "A description identifying qos classification
               policy rule.";
          }
          choice match-type {
            default "match-flow";
            case match-flow {
              container match-flow {
                leaf dscp {
                  type inet:dscp;
                  description
                    "DSCP value.";
                }
                leaf dot1q {
                  type uint16;
                  description
                    "802.1q matching. It is VLAN Tag added into
                     frame.";
                }
                leaf pcp {
                  type uint8 {
                    range "0 .. 7";
                  }
                  description
                    "PCP value.";
                }
                uses pf:acl-eth-header-fields;
                leaf color-type {
                  type identityref {
                    base color-type;
                  }
                  description
                    "Color Types.";



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                }
                leaf-list target-sites {
                  if-feature "target-sites";
                  type svc-id;
                  description
                    "Identify a site as traffic destination.";
                }
                leaf any {
                  type empty;
                  description
                    "Allow all.";
                }
                leaf vpn-id {
                  type svc-id;
                  description
                    "Reference to the target VPN.";
                }
                description
                  "Describe flow matching criteria.";
              }
            }
            case match-application {
              leaf match-application {
                type identityref {
                  base customer-application;
                }
                description
                  "Defines the application to match.";
              }
            }
            description
              "Choice for classification";
          }
          leaf target-class-id {
            type string;
            description
              "Identification of the class of service.
               This identifier is internal to the
               administration.";
          }
          description
            "List of marking rules.";
        }
        description
          "Configuration of the traffic classification policy.";
      }
      container qos-profile {
        leaf profile {



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          type leafref {
            path "/l2vpn-ntw/vpn-profiles/"
               + "valid-provider-identifiers"
               + "/qos-profile-identifier";
          }
          description
            "QoS profile configuration.";
        }
        description
          "QoS profile configuration.";
      }
      description
        "QoS configuration.";
    }
    description
      "This grouping defines QoS parameters
       for a site";
  }

  /* MAIN L2VPN SERVICE */

  container l2vpn-ntw {
    container vpn-profiles {
      container valid-provider-identifiers {
        leaf-list cloud-identifier {
          if-feature "cloud-access";
          type string;
          description
            "Identification of public cloud service
             or internet service. Local administration
             meaning.";
        }
        leaf-list qos-profile-identifier {
          type string;
          description
            "Identification of the QoS Profile to be used.
             Local administration meaning.";
        }
        leaf-list bfd-profile-identifier {
          type string;
          description
            "Identification of the SP BFD Profile to be used.
             Local administration meaning.";
        }
        leaf-list remote-carrier-identifier {
          type string;
          description
            "Identification of the remote carrier name to be used.



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             It can be L2VPN partner, Data center service provider
             or private cloud service provider. Local administration
             meaning.";
        }
        nacm:default-deny-write;
        description
          "Container for Valid Provider Identifies.";
      }
      description
        "Container for VPN Profiles.";
    }
    container vpn-services {
      list vpn-service {
        key "vpn-id";
        leaf vpn-id {
          type svc-id;
          description
            "Refers to unique identifier for the L2NM.";
        }
        leaf l2sm-vpn-id {
          type svc-id;
          description
            "Pointer to the L2SM service.";
        }
        leaf vpn-svc-type {
          type identityref {
            base service-type;
          }
          description
            "Service type";
        }
        leaf customer-name {
          type string;
          description
            "Customer name";
        }
        leaf svc-topo {
          type identityref {
            base vpn-topology;
          }
          description
            "Defining service topology, such as
             any-to-any,hub-spoke, etc.";
        }
        uses l3vpn-ntw:service-status;
        uses site-service;
        uses vpn-service-multicast;
        uses vpn-extranet;



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        uses svc-mtu-grouping;
        uses svc-preservation-grouping;
        uses l3vpn-ntw:svc-transport-encapsulation;
        container vpn-nodes {
          list vpn-node {
            key "vpn-node-id ne-id";
            leaf vpn-node-id {
              type string;
              description
                "";
            }
            leaf description {
              type string;
              description
                "Textual description of a VPN node.";
            }
            leaf node-role {
              type identityref {
                base site-role;
              }
              default "any-to-any-role";
              description
                "Role of the vpn-node in the IP VPN.";
            }
            leaf ne-id {
              type string;
              description
                "NE IP address";
            }
            leaf port-id {
              type string;
              description
                "NE Port-id";
            }
            uses signaling-options-grouping;
            container vpn-network-accesses {
              list vpn-network-access {
                key "network-access-id";
                leaf network-access-id {
                  type string;
                  description
                    "Identifier of network access";
                }
                leaf description {
                  type string;
                  description
                    "String to describe the element.";
                }



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                leaf remote-carrier-name {
                  when "'../site-type' = 'enni'" {
                    description
                      "Site type = enni";
                  }
                  type string;
                  description
                    "Remote carrier name";
                }
                leaf Interface-mtu {
                  type uint32;
                  description
                    "Interface MTU, it is also known as the maximum
                     transmission unit or maximum frame size. When a
                     frame is larger than the MTU, it is broken down,
                     or fragmented, into smaller pieces by the
                     network protocol to accommodate the MTU of the
                     network";
                }
                uses l3vpn-ntw:service-status;
                uses access-diversity;
                uses ethernet-connection-grouping;
                uses availability-grouping;
                uses service-grouping;
                uses B-U-M-grouping;
                uses ethernet-svc-oam-grouping;
                uses mac-loop-prevention-grouping;
                uses acl-grouping;
                uses mac-addr-limit-grouping;
                description
                  "List of VPN Network Accesses.";
              }
              description
                "List of VPN Nodes.";
            }
            description
              "Container of VPN Nodes.";
          }
          description
            "List of vpn-svc";
        }
        description
          "Container of port configurations";
      }
      description
        "Container for L2VPN service";
    }
    description



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      "Container for VPN services.";
  }
}
<CODE ENDS>

                                 Figure 6

6.  Acknowledgements

   The authors would like to thank Tom Petch for the comments to improve
   the document.

7.  Contributors

   Daniel King
   Old Dog Consulting
   Email: daniel@olddog.co.uk

   Victor Lopez
   Telefonica
   Email: victor.lopezalvarez@telefonica.com

   Zhang Guiyu
   China Unicom
   Email: zhanggy113@chinaunicom.cn

   Qin Wu
   Huawei
   Email: bill.wu@huawei.com

8.  IANA Considerations

   This document requests IANA to register the following URI in the "ns"
   subregistry within the "IETF XML Registry" [RFC3688]:

      URI: urn:ietf:params:xml:ns:yang:ietf-l2vpn-ntw

      Registrant Contact: The IESG.

      XML: N/A; the requested URI is an XML namespace.

   This document requests IANA to register the following YANG module in
   the "YANG Module Names" subregistry [RFC6020] within the "YANG
   Parameters" registry.

      name: ietf-l2vpn-ntw

      namespace: urn:ietf:params:xml:ns:yang:ietf-l2vpn-ntw



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      maintained by IANA: N

      prefix: l2vpn-ntw

      reference: RFC XXXX

9.  Security Considerations

   The YANG module specified in this document defines a schema for data
   that is designed to be accessed via network management protocols such
   as NETCONF [RFC6241] or RESTCONF [RFC8040] .  The lowest NETCONF
   layer is the secure transport layer, and the mandatory-to-implement
   secure transport is Secure Shell (SSH) [RFC6242].  The lowest
   RESTCONF layer is HTTPS, and the mandatory-to-implement secure
   transport is TLS [RFC8466].

   The Network Configuration Access Control Model (NACM) [RFC8341]
   provides the means to restrict access for particular NETCONF or
   RESTCONF users to a preconfigured subset of all available NETCONF or
   RESTCONF protocol operations and content.

   The ietf-l2vpn-ntw module is used to manage L2 VPNs in a service
   provider backbone network.  Hence, the module can be used to request,
   modify, or retrieve L2VPN services.  There are a number of data nodes
   defined in this YANG module that are writable/creatable/deletable
   (i.e., config true, which is the default).  These data nodes MAY be
   considered sensitive or vulnerable in some network environments.
   Write operations (e.g., edit-config) and delete operations to these
   data nodes without proper protection or authentication can have a
   negative effect on network operations.  These are the subtrees and
   data nodes and their sensitivity/vulnerability in the ietf-l2vpn-ntw
   module:

   o  vpn-service: An attacker who is able to access network nodes can
      undertake various attacks, such as deleting a running L2 VPN
      Service, interrupting all the traffic of a client.

   Some of the readable data nodes in this YANG module may be considered
   sensitive or vulnerable in some network environments.  It is thus
   important to control read access (e.g., via get, get-config, or
   notification) to these data nodes.  These are the subtrees and data
   nodes and their sensitivity/vulnerability:

   o  customer-name: An attacker can retrieve privacy-related
      information which can be used to track a customer.  Disclosing
      such information may be considered as a violation of the customer-
      provider trust relationship.




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10.  References

10.1.  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>.

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

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

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

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

   [RFC7432]  Sajassi, A., Ed., Aggarwal, R., Bitar, N., Isaac, A.,
              Uttaro, J., Drake, J., and W. Henderickx, "BGP MPLS-Based
              Ethernet VPN", RFC 7432, DOI 10.17487/RFC7432, February
              2015, <https://www.rfc-editor.org/info/rfc7432>.

   [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>.

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

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

   [RFC8214]  Boutros, S., Sajassi, A., Salam, S., Drake, J., and J.
              Rabadan, "Virtual Private Wire Service Support in Ethernet
              VPN", RFC 8214, DOI 10.17487/RFC8214, August 2017,
              <https://www.rfc-editor.org/info/rfc8214>.



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   [RFC8341]  Bierman, A. and M. Bjorklund, "Network Configuration
              Access Control Model", STD 91, RFC 8341,
              DOI 10.17487/RFC8341, March 2018,
              <https://www.rfc-editor.org/info/rfc8341>.

   [RFC8466]  Wen, B., Fioccola, G., Ed., Xie, C., and L. Jalil, "A YANG
              Data Model for Layer 2 Virtual Private Network (L2VPN)
              Service Delivery", RFC 8466, DOI 10.17487/RFC8466, October
              2018, <https://www.rfc-editor.org/info/rfc8466>.

10.2.  Informative References

   [RFC8309]  Wu, Q., Liu, W., and A. Farrel, "Service Models
              Explained", RFC 8309, DOI 10.17487/RFC8309, January 2018,
              <https://www.rfc-editor.org/info/rfc8309>.

   [RFC8340]  Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams",
              BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018,
              <https://www.rfc-editor.org/info/rfc8340>.

   [RFC8453]  Ceccarelli, D., Ed. and Y. Lee, Ed., "Framework for
              Abstraction and Control of TE Networks (ACTN)", RFC 8453,
              DOI 10.17487/RFC8453, August 2018,
              <https://www.rfc-editor.org/info/rfc8453>.

Authors' Addresses

   Samier Barguil (editor)
   Telefonica
   Madrid
   ES

   Email: samier.barguilgiraldo.ext@telefonica.com


   Oscar Gonzalez de Dios (editor)
   Telefonica
   Madrid
   ES

   Email: oscar.gonzalezdedios@telefonica.com


   Mohamed Boucadair
   Orange
   France

   Email: "mohamed.boucadair@orange.com



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   Luis Angel Munoz
   Vodafone
   ES

   Email: luis-angel.munoz@vodafone.com


   Luay Jalil
   Verizon
   USA

   Email: luay.jalil@verizon.com


   Jichun Ma
   China Unicom
   China

   Email: majc16@chinaunicom.cn
































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