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Versions: (draft-shah-pals-mpls-l2vpn-yang) 00 01 draft-ietf-bess-l2vpn-yang

BESS Working Group                                               H. Shah
Internet-Draft                                         Ciena Corporation
Intended status: Standards Track                            P. Brissette
Expires: September 15, 2016                                    R. Rahman
                                                                 K. Raza
                                                     Cisco Systems, Inc.
                                                                   Z. Li
                                                              Z. Shunwan
                                                                W. Haibo
                                                     Huawei Technologies
                                                                 I. Chen
                                                                S. Ahmed
                                                                Ericsson
                                                                M. Bocci
                                                          Alcatel-Lucent
                                                             J. Hardwick
                                                              Metaswitch
                                                                S. Esale
                                                         K. Tiruveedhula
                                                                T. Singh
                                                        Juniper Networks
                                                              I. Hussain
                                                    Infinera Corporation
                                                                  B. Wen
                                                               J. Walker
                                                                 Comcast
                                                             N. Delregno
                                                                L. Jalil
                                                             M. Joecylyn
                                                                 Verizon
                                                          March 14, 2016


                  YANG Data Model for MPLS-based L2VPN
                   draft-shah-bess-l2vpn-yang-01.txt

Abstract

   This document describes a YANG data model for Layer 2 VPN services
   over MPLS networks.  These services include Virtual Private Wire
   Service (VPWS) and Virtual Private LAN service (VPLS) that uses LDP
   and BGP signaled Pseudowires.  The current version of the document
   expands the L2VPN object model to include VPLS services in addition
   to the VPWS services described in the last revision.  This is a
   living document and contains aspects of object models that have been
   discussed extensively in the working group with consensus.  The
   intention is to continue to seek input from larger audience during
   evolution of the L2VPN service model through this document.



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

   This Internet-Draft will expire on September 15, 2016.

Copyright Notice

   Copyright (c) 2016 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
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Updates in this revision  . . . . . . . . . . . . . . . . . .   4
   3.  Specification of Requirements . . . . . . . . . . . . . . . .   4
   4.  L2VPN YANG Model  . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.2.  L2VPN Common  . . . . . . . . . . . . . . . . . . . . . .   8
       4.2.1.  ac-templates  . . . . . . . . . . . . . . . . . . . .   8
       4.2.2.  pw-templates  . . . . . . . . . . . . . . . . . . . .   8
     4.3.  VPWS and Bridge-Table-Instance (formerly referred as
           VPLS) . . . . . . . . . . . . . . . . . . . . . . . . . .   8
       4.3.1.  ac list . . . . . . . . . . . . . . . . . . . . . . .   8
       4.3.2.  pw list . . . . . . . . . . . . . . . . . . . . . . .   8
       4.3.3.  redundancy-grp choice . . . . . . . . . . . . . . . .   9
       4.3.4.  endpoint container  . . . . . . . . . . . . . . . . .   9



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       4.3.5.  vpws-instances and bridge-table-instances container .   9
     4.4.  Operational State . . . . . . . . . . . . . . . . . . . .  10
     4.5.  Open items  . . . . . . . . . . . . . . . . . . . . . . .  10
     4.6.  Yang tree . . . . . . . . . . . . . . . . . . . . . . . .  10
   5.  YANG Module . . . . . . . . . . . . . . . . . . . . . . . . .  20
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  45
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  45
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  45
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  45
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  45
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  45
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  48

1.  Introduction

   The Network Configuration Protocol (NETCONF) [RFC6241] is a network
   management protocol that defines mechanisms to manage network
   devices.  YANG [RFC6020] is a modular language that represents data
   structures in an XML or JSON tree format, and is used as a data
   modeling language for the NETCONF.

   This document introduces a YANG data model for MPLS based Layer 2 VPN
   services (L2VPN) [RFC4664] as well as switching between the local
   attachment circuits.  The L2VPN services include point-to-point VPWS
   and Multipoint VPLS services.  These services are realized by
   signaling Pseudowires across MPLS networks using LDP
   [RFC4447][RFC4762] or BGP[RFC4761].

   The YANG data model in this document defines Ethernet based Layer 2
   services.  Other Layer 2 services, such as ATM, Frame Relay, TDM, etc
   are included in the scope but will be covered as the future work
   items.  The Ethernet based Layer 2 services will leverage the
   definitions used in other standards organizations such as IEEE 802.1
   and Metro Ethernet Forum (MEF).

   The goal is to propose a data object model consisting of building
   blocks that can be assembled in different order to realize different
   services.  The definition work is undertaken initially by a smaller
   working group with members representing various vendors and service
   providers.  The VPWS service definitions were covered first in the
   last revision of the document.  The current version documents VPLS
   services that build on the data blocks defined for VPWS.

   In the current version of this document, refinements to the
   configuration objects and Operational State objects for the same are
   added.





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   The data model is defined for following constructs that are used for
   managing the services:

   o  Configuration

   o  Operational State

   o  Executables (Actions)

   o  Notifications

   The document is organized to first define the data model for the
   configuration of all the L2VPN services followed by definition of
   operational state, actions and notifications for the same.  The L2VPN
   data object model defined in this document uses the instance centric
   approach.  The attributes of each service, VPWS, VPLS, etc are
   specified for a given service instance.

2.  Updates in this revision

   The organization of the configuration objects has been updated.  The
   ac-templates in the common container is removed and a new redundancy-
   group-templates is added.

   The vpls-instances container is removed and replaced with bridge-
   table-instances container to include the PBB, BGP parameters.  This
   revision also introduces a reference to EVPN instance.  This revision
   removes the definition of Attachment Circuits, "ac".  Instead, the
   L2VPN data object model will rely on standard definitions of
   Attachment Circuits that IEEE and IETF are coordinating to define.
   Thus, this revision uses a string as a placeholder for an Attachment
   Circuit within the ac-or-pw-redundancy-grp within the respective
   endpoints list of bridge-table-instances or VPWS instances, and
   expect to update this field once the standard definitions of
   Attachment Circuits are available.

3.  Specification of Requirements

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

4.  L2VPN YANG Model








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4.1.  Overview

   One single top level container, l2vpn, is defined as a parent for
   three different second level containers that are vpws-instances,
   bridge-table-instances, and common building blocks of redundancy-grp
   templates and pseudowire-templates.  The current version of the
   document is extended to include refinements to configuration of vpws-
   instance and bridge-table-instances.  The operations state object has
   been added to hold read-only information of objects that has either
   been configured or dynamically created.

   The L2VPN services have been defined in the IETF L2VPN working group
   but leverages the pseudowire technologies that were defined in the
   PWE3 working group.  A large number of RFCs from these working groups
   cover this subject matter.  Hence, it is prudent that this document
   state the scope of the MPLS L2VPN object model definitions.

   The following documents are within the scope.  This is not an
   exhaustive list but a representation of documents that are covered
   for this work:

   o  Requirements for Pseudo-wire Emulation Edge-to-Edge (PWE3)
      [RFC3916]

   o  Pseudo-wire Emulation Edge-to-Edge (PWE3) Architecture [RFC3985]

   o  IANA Allocations for Pseudowire Edge to Edge Emulation (PWE3)
      [RFC4446]

   o  Pseudowire Setup and Maintenance Using the Label Distribution
      Protocol (LDP) [RFC4447]

   o  Encapsulation Methods for Transport of Ethernet over MPLS Networks
      [RFC4448]

   o  Pseudowire Emulation Edge-to-Edge (PWE3) Control Word for Use over
      an MPLS PSN [RFC4385]

   o  Requirements for Multi-Segment Pseudowire Emulation Edge-to-Edge
      (PWE3) [RFC5254]

   o  An Architecture for Multi-Segment Pseudowire Emulation Edge-to-
      Edge [RFC5659]

   o  Segmented Pseudowire [RFC6073]

   o  Framework for Layer 2 Virtual Private Networks [RFC4664]




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   o  Service Requirements for Layer 2 Provider-Provisioned Virtual
      Private Networks [RFC4665]

   o  Virtual Private LAN Service (VPLS) Using BGP for Auto-Discovery
      and Signaling [RFC4761]

   o  Virtual Private LAN Service (VPLS) Using Label Distribution
      Protocol (LDP) Signaling [RFC4762]

   o  Attachment Individual Identifier (AII) Types for Aggregation
      [RFC5003]

   o  Provisioning, Auto-Discovery, and Signaling in Layer 2 Virtual
      Private Networks (L2VPNs) [RFC6074]

   o  Flow-Aware Transport of Pseudowires over an MPLS Packet Switched
      Network [RFC6391]

   o  Layer 2 Virtual Private Networks Using BGP for Auto-Discovery and
      Signaling [RFC6624]

   o  Extensions to the Virtual Private LAN Service (VPLS) Provider Edge
      (PE) Model for Provider Backbone Bridging [RFC7041]

   o  LDP Extensions for Optimized MAC Address Withdrawal in a
      Hierarchical Virtual Private LAN Service (H-VPLS) [RFC7361]

   o  Using the generic associated channel label for Pseudowire in the
      MPLS Transport Profile [RFC6423]

   o  Pseudowire status for static pseudowire [RFC6478]

   Note that while pseudowire over MPLS-TP related work is in scope, the
   initial effort will only address definitions of object models for
   services that are commonly deployed.

   The ietf work in L2VPN and PWE3 working group relating to L2TP, OAM,
   multicast (e.g. p2mp, etree, etc) and access specific protocols such
   as G.8032, MSTP, etc is out-of-scope for this document.

   The following is the high level view of the L2VPN data model.


 template-ref PW // PW
                    template
                    attributes

 template-ref Redundancy-Group // redundancy-group



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                    template
                    attributes


 bridge-table-instance name // container

         common attributes

         PBB-parameters // container
                           pbb specific attributes

         BGP-parameters // container
                           common attributes
                           auto-discovery attributes
                           signaling attributes

         evpn-instance // reference

         // list of PWs being used
         PW // container
                 template-ref PW
                 attribute-override

         // List of endpoints, where each member endpoint container is -
                 PW // reference
                 redundancy-grp // container
                         AC // eventual reference to standard AC
                         PW // reference

 vpws-instance name // container

         common attributes

         BGP-parameters // container
                           common attributes
                           auto-discovery attributes
                           signaling attributes

         // list of PWs being used
         PW // container
                 template-ref PW
                 attribute-override
                 pw type
                    static-or-ldp
                    bgp-pw
                    bgp-ad-pw

         // ONLY 2 endpoints!!!



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         endpoint-A // container
                 redundancy-grp // container
                         AC // eventual reference to standard AC
                         PW // reference


         endpoint-Z // container
                 redundancy-grp // container
                         AC // eventual reference to standard AC
                         PW // reference

 l2vpn-state // read-only container




                                 Figure 1

4.2.  L2VPN Common

4.2.1.  ac-templates

   The ac-templates container is removed.  The AC will eventually
   reference standard AC definitions defined with coordination between
   the IEEE and IETF, and will inherit all the attributes defined in
   that reference.

4.2.2.  pw-templates

   The pw-templates container contains a list of pw-template.  Each pw-
   template defines a list of common pseudowire attributes such as PW
   MTU, control word support etc.

4.3.  VPWS and Bridge-Table-Instance (formerly referred as VPLS)

4.3.1.  ac list

   AC resides within endpoint container as member of ac-or-pw-or-
   redundandancy-grp.

4.3.2.  pw list

   Each VPWS and Bridge-Table-Instance defines a list of PWs which are
   participating members of the given service instance.  Each entry of
   the PW consists of one pw-template with pre-defined attributes and
   values, but also defines attributes that override those defined in
   referenced pw-template.




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   No restrictions are placed on type of signaling (i.e.  LDP or BGP)
   used for a given PW.  It is entirely possible to define two PWs, one
   signaled by LDP and other by BGP.

   The VPLS specific attribute(s) are present in the definition of the
   PW that are member of VPLS instance only and not applicable to VPWS
   service.

4.3.3.  redundancy-grp choice

   The redundancy-grp is a generic redundancy construct which can hold
   primary and backup members of AC and PWs.  This flexibility permits
   combinations of -

   o  primary and backup AC

   o  primary and backup PW

   o  primary AC and backup PW

   o  primary PW and backup AC

4.3.4.  endpoint container

   The endpoint container in general holds AC, PW or redundancy-grp
   references.  The core aspect of endpoint container is its flexible
   personality based on what user decides to include in it.  It is
   future-proofed with possible extensions that can be included in the
   endpoint container such as Integrated Route Bridging (IRB), PW
   Headend, Virtual Switch Instance, etc.

   The endpoint container for the VPLS service holds references to a
   list of ACs, a list of PWs or a redundancy group that contains a list
   of ACs and/or a list of PWs.  This differs from the VPWS instance
   where an endpoint contains exactly one member; AC or PW or redundancy
   group and not a list.

4.3.5.  vpws-instances and bridge-table-instances container

   The vpws-instances container contains a list of vpws-instance.  Each
   entry of the vpws-instance represents a layer-2 cross-connection of
   two endpoints.  This model defines three possible types of endpoints,
   ac, pw, and redundancy-grp, and allows a vpws-instance to cross-
   connect any one type of endpoint to all other types of endpoint.

   The bridge-table-instances container contains a list of bridge-table-
   instance.  Each entry of the bridge-table-instance represent a list
   of endpoints that are member of the broadcast/bridge domain.  The



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   bridge-table-instance endpoints introduces an additional forwarding
   characteristics to a list of PWs and/or ACs.  This split-horizon
   forwarding behavior is typical in bridge-table instance.

   The augmentation of ietf-l2vpn module is TBD.  All IP addresses
   defined in this module are currently scoped under global VRF/table.

4.4.  Operational State

   The operational state of L2VPN can be queried and obtained from the
   read-only container defined in this document as "l2vpn-state".  This
   container holds the runtime information of the bridge-table-instance
   and vpws-instance.

4.5.  Open items

   The design team has identified several attributes that need to be
   included in the YANG tree.  These attributes are listed here for the
   purpose of keeping track and are candidates for future revisions.

   These attributes are :

   o  configuration - vccv configuration knobs

   o  operational state - vccv and cw-negotiation

   This list is not exhaustive and expected to grow.  The list will
   shrink as items are processed and included in the YANG tree.

4.6.  Yang tree

module: ietf-l2vpn
   +--rw l2vpn
   |  +--rw common
   |  |  +--rw pw-templates
   |  |  |  +--rw pw-template* [name]
   |  |  |     +--rw name              string
   |  |  |     +--rw mtu?              uint32
   |  |  |     +--rw cw-negotiation?   cw-negotiation-type
   |  |  |     +--rw tunnel-policy?    string
   |  |  +--rw redundancy-group-templates
   |  |     +--rw redundancy-group-template* [name]
   |  |        +--rw name               string
   |  |        +--rw protection-mode?   enumeration
   |  |        +--rw reroute-mode?      enumeration
   |  |        +--rw reroute-delay?     uint16
   |  |        +--rw dual-receive?      boolean
   |  |        +--rw revert?            boolean



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   |  |        +--rw revert-delay?      uint16
   |  +--rw bridge-table-instances
   |  |  +--rw bridge-table-instance* [name]
   |  |     +--rw name               string
   |  |     +--rw mtu?               uint32
   |  |     +--rw mac-aging-timer?   uint32
   |  |     +--rw pbb-parameters
   |  |     |  +--rw (component-type)?
   |  |     |     +--:(i-component)
   |  |     |     |  +--rw i-tag?              uint32
   |  |     |     |  +--rw backbone-src-mac?   yang:mac-address
   |  |     |     +--:(b-component)
   |  |     |        +--rw bind-b-component?   bridge-table-instance-ref
   |  |     +--rw bgp-parameters
   |  |     |  +--rw common
   |  |     |  |  +--rw route-distinguisher?   string
   |  |     |  |  +--rw vpn-targets* [rt-value]
   |  |     |  |     +--rw rt-value    string
   |  |     |  |     +--rw rt-type     bgp-rt-type
   |  |     |  +--rw discovery
   |  |     |  |  +--rw vpn-id?   string
   |  |     |  +--rw signaling
   |  |     |     +--rw site-id?      uint16
   |  |     |     +--rw site-range?   uint16
   |  |     +--rw evpn-instance?     string
   |  |     +--rw pw* [name]
   |  |     |  +--rw name              string
   |  |     |  +--rw template?         pw-template-ref
   |  |     |  +--rw mtu?              uint32
   |  |     |  +--rw mac-withdraw?     boolean
   |  |     |  +--rw cw-negotiation?   cw-negotiation-type
   |  |     |  +--rw discovery-type?   l2vpn-discovery-type
   |  |     |  +--rw signaling-type?   l2vpn-signaling-type
   |  |     |  +--rw peer-ip?          inet:ip-address
   |  |     |  +--rw pw-id?            uint32
   |  |     |  +--rw transmit-label?   uint32
   |  |     |  +--rw receive-label?    uint32
   |  |     |  +--rw tunnel-policy?    string
   |  |     +--rw endpoint* [id]
   |  |        +--rw id                     uint16
   |  |        +--rw split-horizon-group?   string
   |  |        +--rw (ac-or-pw-or-redundancy-grp)?
   |  |           +--:(ac)
   |  |           |  +--rw ac* [name]
   |  |           |     +--rw name    string
   |  |           +--:(pw)
   |  |           |  +--rw pw* [name]
   |  |           |     +--rw name    -> ../../../pw/name



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   |  |           +--:(redundancy-grp)
   |  |              +--rw (primary)
   |  |              |  +--:(primary-pw)
   |  |              |  |  +--rw primary-pw* [name]
   |  |              |  |     +--rw name    -> ../../../pw/name
   |  |              |  +--:(primary-ac)
   |  |              |     +--rw primary-ac?            string
   |  |              +--rw (backup)?
   |  |              |  +--:(backup-pw)
   |  |              |  |  +--rw backup-pw* [name]
   |  |              |  |     +--rw name          -> ../../../pw/name
   |  |              |  |     +--rw precedence?   uint32
   |  |              |  +--:(backup-ac)
   |  |              |     +--rw backup-ac?             string
   |  |              +--rw template?              -> /l2vpn/common/redundancy-group-templates/redundancy-group-template/name
   |  |              +--rw protection-mode?       enumeration
   |  |              +--rw reroute-mode?          enumeration
   |  |              +--rw reroute-delay?         uint16
   |  |              +--rw dual-receive?          boolean
   |  |              +--rw revert?                boolean
   |  |              +--rw revert-delay?          uint16
   |  +--rw vpws-instances
   |     +--rw vpws-instance* [name]
   |        +--rw name               string
   |        +--rw description?       string
   |        +--rw mtu?               uint32
   |        +--rw mac-aging-timer?   uint32
   |        +--rw service-type?      l2vpn-service-type
   |        +--rw discovery-type?    l2vpn-discovery-type
   |        +--rw signaling-type     l2vpn-signaling-type
   |        +--rw bgp-parameters
   |        |  +--rw common
   |        |  |  +--rw route-distinguisher?   string
   |        |  |  +--rw vpn-targets* [rt-value]
   |        |  |     +--rw rt-value    string
   |        |  |     +--rw rt-type     bgp-rt-type
   |        |  +--rw discovery
   |        |  |  +--rw vpn-id?   string
   |        |  +--rw signaling
   |        |     +--rw site-id?      uint16
   |        |     +--rw site-range?   uint16
   |        +--rw pw* [name]
   |        |  +--rw name              string
   |        |  +--rw template?         pw-template-ref
   |        |  +--rw mtu?              uint32
   |        |  +--rw mac-withdraw?     boolean
   |        |  +--rw cw-negotiation?   cw-negotiation-type
   |        |  +--rw vccv-ability?     boolean



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   |        |  +--rw tunnel-policy?    string
   |        |  +--rw request-vlanid?   uint16
   |        |  +--rw vlan-tpid?        string
   |        |  +--rw ttl?              uint8
   |        |  +--rw (pw-type)?
   |        |     +--:(ldp-or-static-pw)
   |        |     |  +--rw peer-ip?          inet:ip-address
   |        |     |  +--rw pw-id?            uint32
   |        |     |  +--rw icb?              boolean
   |        |     |  +--rw transmit-label?   uint32
   |        |     |  +--rw receive-label?    uint32
   |        |     +--:(bgp-pw)
   |        |     |  +--rw remote-pe-id?     inet:ip-address
   |        |     +--:(bgp-ad-pw)
   |        |        +--rw remote-ve-id?     uint16
   |        +--rw endpoint-a
   |        |  +--rw (ac-or-pw-or-redundancy-grp)?
   |        |     +--:(ac)
   |        |     |  +--rw ac?                string
   |        |     +--:(pw)
   |        |     |  +--rw pw?                -> ../../pw/name
   |        |     +--:(redundancy-grp)
   |        |        +--rw (primary)
   |        |        |  +--:(primary-pw)
   |        |        |  |  +--rw primary-pw?        -> ../../pw/name
   |        |        |  +--:(primary-ac)
   |        |        |     +--rw primary-ac?        string
   |        |        +--rw (backup)
   |        |        |  +--:(backup-pw)
   |        |        |  |  +--rw backup-pw?         -> ../../pw/name
   |        |        |  +--:(backup-ac)
   |        |        |     +--rw backup-ac?         string
   |        |        +--rw template?          -> /l2vpn/common/redundancy-group-templates/redundancy-group-template/name
   |        |        +--rw protection-mode?   enumeration
   |        |        +--rw reroute-mode?      enumeration
   |        |        +--rw reroute-delay?     uint16
   |        |        +--rw dual-receive?      boolean
   |        |        +--rw revert?            boolean
   |        |        +--rw revert-delay?      uint16
   |        +--rw endpoint-z
   |           +--rw (ac-or-pw-or-redundancy-grp)?
   |              +--:(ac)
   |              |  +--rw ac?                string
   |              +--:(pw)
   |              |  +--rw pw?                -> ../../pw/name
   |              +--:(redundancy-grp)
   |                 +--rw (primary)
   |                 |  +--:(primary-pw)



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   |                 |  |  +--rw primary-pw?        -> ../../pw/name
   |                 |  +--:(primary-ac)
   |                 |     +--rw primary-ac?        string
   |                 +--rw (backup)
   |                 |  +--:(backup-pw)
   |                 |  |  +--rw backup-pw?         -> ../../pw/name
   |                 |  +--:(backup-ac)
   |                 |     +--rw backup-ac?         string
   |                 +--rw template?          -> /l2vpn/common/redundancy-group-templates/redundancy-group-template/name
   |                 +--rw protection-mode?   enumeration
   |                 +--rw reroute-mode?      enumeration
   |                 +--rw reroute-delay?     uint16
   |                 +--rw dual-receive?      boolean
   |                 +--rw revert?            boolean
   |                 +--rw revert-delay?      uint16
   +--ro l2vpn-state
      +--ro bridge-table-instances-state
      |  +--ro bridge-table-instance-state* [name]
      |     +--ro name                  string
      |     +--ro mtu?                  uint32
      |     +--ro mac-aging-timer?      uint32
      |     +--ro pbb-parameters
      |     |  +--ro (component-type)?
      |     |     +--:(i-component)
      |     |     |  +--ro i-tag?              uint32
      |     |     |  +--ro backbone-src-mac?   yang:mac-address
      |     |     +--:(b-component)
      |     |        +--ro bind-b-component?   string
      |     +--ro bgp-parameters
      |     |  +--ro common
      |     |  |  +--ro route-distinguisher?   string
      |     |  |  +--ro vpn-targets* [rt-value]
      |     |  |     +--ro rt-value    string
      |     |  |     +--ro rt-type     bgp-rt-type
      |     |  +--ro discovery
      |     |  |  +--ro vpn-id?   string
      |     |  +--ro signaling
      |     |     +--ro site-id?      uint16
      |     |     +--ro site-range?   uint16
      |     +--ro evpn-instance-name?   string
      |     +--ro endpoint* [id]
      |        +--ro id                     uint16
      |        +--ro split-horizon-group?   string
      |        +--ro (ac-or-pw-or-redundancy-grp)?
      |           +--:(ac)
      |           |  +--ro ac* [name]
      |           |     +--ro name     string
      |           |     +--ro state?   operational-state-type



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      |           +--:(pw)
      |           |  +--ro pw* [name]
      |           |     +--ro name              string
      |           |     +--ro state?            operational-state-type
      |           |     +--ro mtu?              uint32
      |           |     +--ro mac-withdraw?     boolean
      |           |     +--ro cw-negotiation?   cw-negotiation-type
      |           |     +--ro discovery-type?   l2vpn-discovery-type
      |           |     +--ro signaling-type?   l2vpn-signaling-type
      |           |     +--ro peer-ip?          inet:ip-address
      |           |     +--ro pw-id?            uint32
      |           |     +--ro transmit-label?   uint32
      |           |     +--ro receive-label?    uint32
      |           |     +--ro tunnel-policy?    string
      |           +--:(redundancy-grp)
      |              +--ro (primary)
      |              |  +--:(primary-pw)
      |              |  |  +--ro primary-pw* [name]
      |              |  |     +--ro name              string
      |              |  |     +--ro state?            operational-state-type
      |              |  |     +--ro mtu?              uint32
      |              |  |     +--ro mac-withdraw?     boolean
      |              |  |     +--ro cw-negotiation?   cw-negotiation-type
      |              |  |     +--ro discovery-type?   l2vpn-discovery-type
      |              |  |     +--ro signaling-type?   l2vpn-signaling-type
      |              |  |     +--ro peer-ip?          inet:ip-address
      |              |  |     +--ro pw-id?            uint32
      |              |  |     +--ro transmit-label?   uint32
      |              |  |     +--ro receive-label?    uint32
      |              |  |     +--ro tunnel-policy?    string
      |              |  +--:(primary-ac)
      |              |     +--ro primary-ac
      |              |        +--ro name?    string
      |              |        +--ro state?   operational-state-type
      |              +--ro (backup)?
      |              |  +--:(backup-pw)
      |              |  |  +--ro backup-pw* [name]
      |              |  |     +--ro name              string
      |              |  |     +--ro state?            operational-state-type
      |              |  |     +--ro mtu?              uint32
      |              |  |     +--ro mac-withdraw?     boolean
      |              |  |     +--ro cw-negotiation?   cw-negotiation-type
      |              |  |     +--ro discovery-type?   l2vpn-discovery-type
      |              |  |     +--ro signaling-type?   l2vpn-signaling-type
      |              |  |     +--ro peer-ip?          inet:ip-address
      |              |  |     +--ro pw-id?            uint32
      |              |  |     +--ro transmit-label?   uint32
      |              |  |     +--ro receive-label?    uint32



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      |              |  |     +--ro tunnel-policy?    string
      |              |  |     +--ro precedence?       uint32
      |              |  +--:(backup-ac)
      |              |     +--ro backup-ac
      |              |        +--ro name?    string
      |              |        +--ro state?   operational-state-type
      |              +--ro protection-mode?       enumeration
      |              +--ro reroute-mode?          enumeration
      |              +--ro reroute-delay?         uint16
      |              +--ro dual-receive?          boolean
      |              +--ro revert?                boolean
      |              +--ro revert-delay?          uint16
      +--ro vpws-instances-state
         +--ro vpws-instance-state* [name]
            +--ro name               string
            +--ro mtu?               uint32
            +--ro mac-aging-timer?   uint32
            +--ro service-type?      l2vpn-service-type
            +--ro discovery-type?    l2vpn-discovery-type
            +--ro signaling-type     l2vpn-signaling-type
            +--ro bgp-parameters
            |  +--ro common
            |  |  +--ro route-distinguisher?   string
            |  |  +--ro vpn-targets* [rt-value]
            |  |     +--ro rt-value    string
            |  |     +--ro rt-type     bgp-rt-type
            |  +--ro discovery
            |  |  +--ro vpn-id?   string
            |  +--ro signaling
            |     +--ro site-id?      uint16
            |     +--ro site-range?   uint16
            +--ro endpoint-a
            |  +--ro (ac-or-pw-or-redundancy-grp)?
            |     +--:(ac)
            |     |  +--ro ac
            |     |     +--ro name?    string
            |     |     +--ro state?   operational-state-type
            |     +--:(pw)
            |     |  +--ro pw
            |     |     +--ro name?             string
            |     |     +--ro state?            operational-state-type
            |     |     +--ro mtu?              uint32
            |     |     +--ro mac-withdraw?     boolean
            |     |     +--ro cw-negotiation?   cw-negotiation-type
            |     |     +--ro vccv-ability?     boolean
            |     |     +--ro tunnel-policy?    string
            |     |     +--ro request-vlanid?   uint16
            |     |     +--ro vlan-tpid?        string



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            |     |     +--ro ttl?              uint8
            |     |     +--ro (pw-type)?
            |     |        +--:(ldp-or-static-pw)
            |     |        |  +--ro peer-ip?          inet:ip-address
            |     |        |  +--ro pw-id?            uint32
            |     |        |  +--ro icb?              boolean
            |     |        |  +--ro transmit-label?   uint32
            |     |        |  +--ro receive-label?    uint32
            |     |        +--:(bgp-pw)
            |     |        |  +--ro remote-pe-id?     inet:ip-address
            |     |        +--:(bgp-ad-pw)
            |     |           +--ro remote-ve-id?     uint16
            |     +--:(redundancy-grp)
            |        +--ro (primary)
            |        |  +--:(primary-pw)
            |        |  |  +--ro primary-pw
            |        |  |     +--ro name?             string
            |        |  |     +--ro state?            operational-state-type
            |        |  |     +--ro mtu?              uint32
            |        |  |     +--ro mac-withdraw?     boolean
            |        |  |     +--ro cw-negotiation?   cw-negotiation-type
            |        |  |     +--ro vccv-ability?     boolean
            |        |  |     +--ro tunnel-policy?    string
            |        |  |     +--ro request-vlanid?   uint16
            |        |  |     +--ro vlan-tpid?        string
            |        |  |     +--ro ttl?              uint8
            |        |  |     +--ro (pw-type)?
            |        |  |        +--:(ldp-or-static-pw)
            |        |  |        |  +--ro peer-ip?          inet:ip-address
            |        |  |        |  +--ro pw-id?            uint32
            |        |  |        |  +--ro icb?              boolean
            |        |  |        |  +--ro transmit-label?   uint32
            |        |  |        |  +--ro receive-label?    uint32
            |        |  |        +--:(bgp-pw)
            |        |  |        |  +--ro remote-pe-id?     inet:ip-address
            |        |  |        +--:(bgp-ad-pw)
            |        |  |           +--ro remote-ve-id?     uint16
            |        |  +--:(primary-ac)
            |        |     +--ro primary-ac-name?   string
            |        +--ro (backup)
            |        |  +--:(backup-pw)
            |        |  |  +--ro backup-pw
            |        |  |     +--ro name?             string
            |        |  |     +--ro state?            operational-state-type
            |        |  |     +--ro mtu?              uint32
            |        |  |     +--ro mac-withdraw?     boolean
            |        |  |     +--ro cw-negotiation?   cw-negotiation-type
            |        |  |     +--ro vccv-ability?     boolean



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            |        |  |     +--ro tunnel-policy?    string
            |        |  |     +--ro request-vlanid?   uint16
            |        |  |     +--ro vlan-tpid?        string
            |        |  |     +--ro ttl?              uint8
            |        |  |     +--ro (pw-type)?
            |        |  |        +--:(ldp-or-static-pw)
            |        |  |        |  +--ro peer-ip?          inet:ip-address
            |        |  |        |  +--ro pw-id?            uint32
            |        |  |        |  +--ro icb?              boolean
            |        |  |        |  +--ro transmit-label?   uint32
            |        |  |        |  +--ro receive-label?    uint32
            |        |  |        +--:(bgp-pw)
            |        |  |        |  +--ro remote-pe-id?     inet:ip-address
            |        |  |        +--:(bgp-ad-pw)
            |        |  |           +--ro remote-ve-id?     uint16
            |        |  +--:(backup-ac)
            |        |     +--ro backup-ac-name?    string
            |        +--ro protection-mode?   enumeration
            |        +--ro reroute-mode?      enumeration
            |        +--ro reroute-delay?     uint16
            |        +--ro dual-receive?      boolean
            |        +--ro revert?            boolean
            |        +--ro revert-delay?      uint16
            +--ro endpoint-z
               +--ro (ac-or-pw-or-redundancy-grp)?
                  +--:(ac)
                  |  +--ro ac
                  |     +--ro name?    string
                  |     +--ro state?   operational-state-type
                  +--:(pw)
                  |  +--ro pw
                  |     +--ro name?             string
                  |     +--ro state?            operational-state-type
                  |     +--ro mtu?              uint32
                  |     +--ro mac-withdraw?     boolean
                  |     +--ro cw-negotiation?   cw-negotiation-type
                  |     +--ro vccv-ability?     boolean
                  |     +--ro tunnel-policy?    string
                  |     +--ro request-vlanid?   uint16
                  |     +--ro vlan-tpid?        string
                  |     +--ro ttl?              uint8
                  |     +--ro (pw-type)?
                  |        +--:(ldp-or-static-pw)
                  |        |  +--ro peer-ip?          inet:ip-address
                  |        |  +--ro pw-id?            uint32
                  |        |  +--ro icb?              boolean
                  |        |  +--ro transmit-label?   uint32
                  |        |  +--ro receive-label?    uint32



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                  |        +--:(bgp-pw)
                  |        |  +--ro remote-pe-id?     inet:ip-address
                  |        +--:(bgp-ad-pw)
                  |           +--ro remote-ve-id?     uint16
                  +--:(redundancy-grp)
                     +--ro (primary)
                     |  +--:(primary-pw)
                     |  |  +--ro primary-pw
                     |  |     +--ro name?             string
                     |  |     +--ro state?            operational-state-type
                     |  |     +--ro mtu?              uint32
                     |  |     +--ro mac-withdraw?     boolean
                     |  |     +--ro cw-negotiation?   cw-negotiation-type
                     |  |     +--ro vccv-ability?     boolean
                     |  |     +--ro tunnel-policy?    string
                     |  |     +--ro request-vlanid?   uint16
                     |  |     +--ro vlan-tpid?        string
                     |  |     +--ro ttl?              uint8
                     |  |     +--ro (pw-type)?
                     |  |        +--:(ldp-or-static-pw)
                     |  |        |  +--ro peer-ip?          inet:ip-address
                     |  |        |  +--ro pw-id?            uint32
                     |  |        |  +--ro icb?              boolean
                     |  |        |  +--ro transmit-label?   uint32
                     |  |        |  +--ro receive-label?    uint32
                     |  |        +--:(bgp-pw)
                     |  |        |  +--ro remote-pe-id?     inet:ip-address
                     |  |        +--:(bgp-ad-pw)
                     |  |           +--ro remote-ve-id?     uint16
                     |  +--:(primary-ac)
                     |     +--ro primary-ac-name?   string
                     +--ro (backup)
                     |  +--:(backup-pw)
                     |  |  +--ro backup-pw
                     |  |     +--ro name?             string
                     |  |     +--ro state?            operational-state-type
                     |  |     +--ro mtu?              uint32
                     |  |     +--ro mac-withdraw?     boolean
                     |  |     +--ro cw-negotiation?   cw-negotiation-type
                     |  |     +--ro vccv-ability?     boolean
                     |  |     +--ro tunnel-policy?    string
                     |  |     +--ro request-vlanid?   uint16
                     |  |     +--ro vlan-tpid?        string
                     |  |     +--ro ttl?              uint8
                     |  |     +--ro (pw-type)?
                     |  |        +--:(ldp-or-static-pw)
                     |  |        |  +--ro peer-ip?          inet:ip-address
                     |  |        |  +--ro pw-id?            uint32



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                     |  |        |  +--ro icb?              boolean
                     |  |        |  +--ro transmit-label?   uint32
                     |  |        |  +--ro receive-label?    uint32
                     |  |        +--:(bgp-pw)
                     |  |        |  +--ro remote-pe-id?     inet:ip-address
                     |  |        +--:(bgp-ad-pw)
                     |  |           +--ro remote-ve-id?     uint16
                     |  +--:(backup-ac)
                     |     +--ro backup-ac-name?    string
                     +--ro protection-mode?   enumeration
                     +--ro reroute-mode?      enumeration
                     +--ro reroute-delay?     uint16
                     +--ro dual-receive?      boolean
                     +--ro revert?            boolean
                     +--ro revert-delay?      uint16

                                 Figure 2

5.  YANG Module

   The L2VPN configuration container is logically divided into following
   high level config areas:


<CODE BEGINS> file "ietf-l2vpn@2016-03-07.yang"
module ietf-l2vpn {
  namespace "urn:ietf:params:xml:ns:yang:ietf-l2vpn";
  prefix "l2vpn";

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

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

  organization  "ietf";
  contact       "ietf";
  description   "l2vpn";

  revision "2016-03-07" {
    description "Third revision " +
                "  - Changed the module name to ietf-l2vpn " +
                "  - Merged EVPN into L2VPN " +
                "  - Eliminated the definitions of attachment " +
                "    circuit with the intention to reuse other " +
                "    layer-2 definitions " +



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                "  - Added state branch";
    reference "";
  }

  revision "2015-10-08" {
    description "Second revision " +
                "  - Added container vpls-instances " +
                "  - Rearranged groupings and typedefs to be " +
                "    reused across vpls-instance and vpws-instances";
    reference "";
  }

  revision "2015-06-30" {
    description "Initial revision";
    reference   "";
  }

  /* identities */

  identity link-discovery-protocol {
    description "Base identiy from which identities describing " +
                "link discovery protocols are derived.";
  }

  identity lacp {
    base "link-discovery-protocol";
    description "This identity represents LACP";
  }

  identity lldp {
    base "link-discovery-protocol";
    description "This identity represents LLDP";
  }

  identity bpdu {
    base "link-discovery-protocol";
    description "This identity represens BPDU";
  }

  identity cpd {
    base "link-discovery-protocol";
    description "This identity represents CPD";
  }

  identity udld {
    base "link-discovery-protocol";
    description "This identity represens UDLD";
  }



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  /* typedefs */

  typedef l2vpn-service-type {
    type enumeration {
      enum ethernet {
        description "Ethernet service";
      }
      enum ATM {
        description "Asynchronous Transfer Mode";
      }
      enum FR {
        description "Frame-Relay";
      }
      enum TDM {
        description "Time Division Multiplexing";
      }
    }
    description "L2VPN service type";
  }

  typedef l2vpn-discovery-type {
    type enumeration {
      enum manual {
        description "Manual configuration";
      }
      enum bgp-ad {
        description "Border Gateway Protocol (BGP) auto-discovery";
      }
      enum ldp {
        description "Label Distribution Protocol (LDP)";
      }
      enum mixed {
        description "Mixed";
      }
    }
    description "L2VPN discovery type";
  }

  typedef l2vpn-signaling-type {
    type enumeration {
      enum static {
        description "Static configuration of labels (no signaling)";
      }
      enum ldp {
        description "Label Distribution Protocol (LDP) signaling";
      }
      enum bgp {
        description "Border Gateway Protocol (BGP) signaling";



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      }
      enum mixed {
        description "Mixed";
      }
    }
    description "L2VPN signaling type";
  }

  typedef bgp-rt-type {
    type enumeration {
      enum import {
        description "For import";
      }
      enum export {
        description "For export";
      }
      enum both {
        description "For both import and export";
      }
    }
    description "BGP route-target type. Import from BGP YANG";
  }

  typedef cw-negotiation-type {
    type enumeration {
      enum "non-preferred" {
        description "No preference for control-word";
      }
      enum "preferred" {
        description "Prefer to have control-word negotiation";
      }
    }
    description "control-word negotiation preference type";
  }

  typedef link-discovery-protocol-type {
    type identityref {
      base "link-discovery-protocol";
    }
    description "This type is used to identify " +
                "link discovery protocol";
  }

  typedef pbb-component-type {
    type enumeration {
      enum "b-component" {
        description "Identifies as a b-component";
      }



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      enum "i-component" {
        description "Identifies as an i-component";
      }
    }
    description "This type is used to identify " +
                "the type of PBB component";
  }

  typedef pw-template-ref {
    type leafref {
      path "/l2vpn/common/pw-templates/pw-template/name";
    }
    description "pw-template-ref";
  }

  typedef redundancy-group-template-ref {
    type leafref {
      path "/l2vpn/common/redundancy-group-templates" +
           "/redundancy-group-template/name";
    }
    description "redundancy-group-template-ref";
  }

  typedef bridge-table-instance-ref {
    type leafref {
      path "/l2vpn/bridge-table-instances" +
           "/bridge-table-instance/name";
    }
    description "bridge-table-instance-ref";
  }

  typedef operational-state-type {
    type enumeration {
      enum 'up' {
        description "Operational state is up";
      }
      enum 'down' {
        description "Operational state is down";
      }
    }
    description "operational-state-type";
  }

  /* groupings */

  grouping pbb-parameters-grp {
    description "PBB parameters grouping";
    container pbb-parameters {



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      description "pbb-parameters";
      choice component-type {
        description "PBB component type";
        case i-component {
          leaf i-tag {
            type uint32;
            description "i-tag";
          }
          leaf backbone-src-mac {
            type yang:mac-address;
            description "backbone-src-mac";
          }
        }
        case b-component {
          leaf bind-b-component {
            type bridge-table-instance-ref;
            description "Reference to the associated b-component";
          }
        }
      }
    }
  }

  grouping pbb-parameters-state-grp {
    description "PBB parameters grouping";
    container pbb-parameters {
      description "pbb-parameters";
      choice component-type {
        description "PBB component type";
        case i-component {
          leaf i-tag {
            type uint32;
            description "i-tag";
          }
          leaf backbone-src-mac {
            type yang:mac-address;
            description "backbone-src-mac";
          }
        }
        case b-component {
          leaf bind-b-component {
            type string;
            description "Name of the associated b-component";
          }
        }
      }
    }
  }



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  grouping bgp-parameters-grp {
    description "BGP parameters grouping";
    container bgp-parameters {
      description "Parameters for BGP";
      container common {
        when "../../discovery-type = 'bgp-ad'" {
          description "Check discovery type: " +
                      "Can only configure BGP discovery if " +
                      "discovery type is BGP-AD";
        }
        description "Common BGP parameters";
        leaf route-distinguisher {
          type string;
          description "BGP RD";
        }
        list vpn-targets {
          key rt-value;
          description "Route Targets";
          leaf rt-value {
            type string;
            description "Route-Target value";
          }
          leaf rt-type {
            type bgp-rt-type;
            mandatory true;
            description "Type of RT";
          }
        }
      }
      container discovery {
        when "../../discovery-type = 'bgp-ad'" {
          description "BGP parameters for discovery: " +
                      "Can only configure BGP discovery if " +
                      "discovery type is BGP-AD";
        }
        description "BGP parameters for discovery";
        leaf vpn-id {
          type string;
          description "VPN ID";
        }
      }
      container signaling {
        when "../../signaling-type = 'bgp'" {
          description "Check signaling type: " +
                      "Can only configure BGP signaling if " +
                      "signaling type is BGP";
        }
        description "BGP parameters for signaling";



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        leaf site-id {
          type uint16;
          description "Site ID";
        }
        leaf site-range {
          type uint16;
          description "Site Range";
        }
      }
    }
  }

  grouping pw-type-grp {
    description "pseudowire type grouping";
    choice pw-type {
      description "A choice of pseudowire type";
      case ldp-or-static-pw {
        leaf peer-ip {
          type inet:ip-address;
          description "peer IP address";
        }
        leaf pw-id {
          type uint32;
          description "pseudowire id";
        }
        leaf icb {
          type boolean;
          description "inter-chassis backup";
        }
        leaf transmit-label {
          type uint32;
          description "transmit lable";
        }
        leaf receive-label {
          type uint32;
          description "receive label";
        }
      }
      case bgp-pw {
        leaf remote-pe-id {
          type inet:ip-address;
          description "remote pe id";
        }
      }
      case bgp-ad-pw {
        leaf remote-ve-id {
          type uint16;
          description "remote ve id";



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        }
      }
    }
  }

  grouping bridge-table-instance-pw-list-grp {
    description "bridge-table-instance-pw-list-grp";
    list pw {
      key "name";
      leaf name {
        type leafref {
          path "../../../pw/name";
        }
        description "name of pseudowire";
      }
      description "A bridge table instance's pseudowire list";
    }
  }

  grouping bridge-table-instance-ac-list-grp {
    description "bridge-table-instance-ac-list-grp";
    list ac {
      key "name";
      leaf name {
        type string;
        description "Name of attachment circuit.  This field " +
                    "is intended to reference standardized " +
                    "layer-2 definitions.";
      }
      description "A bridge table instance's " +
                  "attachment circuit list";
    }
  }

  grouping redundancy-group-properties-grp {
    description "redundancy-group-properties-grp";
    leaf protection-mode {
      type enumeration {
        enum "frr" {
          value 0;
          description "fast reroute";
        }
        enum "master-slave" {
          value 1;
          description "master-slave";
        }
        enum "independent" {
          value 2;



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          description "independent";
        }
      }
      description "protection-mode";
    }
    leaf reroute-mode {
      type enumeration {
        enum "immediate" {
          value 0;
          description "immediate reroute";
        }
        enum "delayed" {
          value 1;
          description "delayed reroute";
        }
        enum "never" {
          value 2;
          description "never reroute";
        }
      }
      description "reroute-mode";
    }
    leaf reroute-delay {
      when "../reroute-mode = 'delayed'" {
        description "Specify amount of time to delay reroute " +
                    "only when delayed route is configured";
      }
      type uint16;
      description "amount of time to delay reroute";
    }
    leaf dual-receive {
      type boolean;
      description
      "allow extra traffic to be carried by backup";
    }
    leaf revert {
      type boolean;
      description "allow forwarding to revert to primary " +
                  "after restoring primary";
      /* This is called "revertive" during the discussion. */
    }
    leaf revert-delay {
      when "../revert = 'true'" {
        description "Specify the amount of time to wait to revert " +
                    "to primary only if reversion is configured";
      }
      type uint16;
      description "amount ot time to wait to revert to primary";



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      /* This is called "wtr" during discussion. */
    }
  }

  grouping bridge-table-instance-endpoint-grp {
    description "A bridge table instance's endpoint";
    choice ac-or-pw-or-redundancy-grp {
      description "A choice ofattachment circuit or " +
                  "pseudowire or redundancy group";
      case ac {
        uses bridge-table-instance-ac-list-grp;
        description "reference to attachment circuits";
      }
      case pw {
        uses bridge-table-instance-pw-list-grp;
        description "reference to pseudowires";
      }
      case redundancy-grp {
        choice primary {
          mandatory true;
          description "primary options";
          case primary-pw {
            description "primary-pw";
            list primary-pw {
              key "name";
              leaf name {
                type leafref {
                  path "../../../pw/name";
                }
                description "Reference a pseudowire";
              }
              description "A list of primary pseudowires";
            }
          }
          case primary-ac {
            description "primary-ac";
            leaf primary-ac {
              type string;
              description "Name of primary attachment circuit.  " +
                          "This field is intended to reference " +
                          "standardized layer-2 definitions.";
            }
          }
        }
        choice backup {
          description "backup options";
          case backup-pw {
            list backup-pw {



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              key "name";
              leaf name {
                type leafref {
                  path "../../../pw/name";
                }
                description "Reference an attachment circuit";
              }
              leaf precedence {
                type uint32;
                description "precedence of the pseudowire";
              }
              description "A list of backup pseudowires";
            }
          }
          case backup-ac {
            leaf backup-ac {
              type string;
              description "Name of backup attachment circuit.  " +
                          "This field is intended to reference " +
                          "standardized layer-2 definitions.";
            }
            description "backup-ac";
          }
        }
        leaf template {
          type leafref {
            path "/l2vpn/common/redundancy-group-templates" +
                 "/redundancy-group-template/name";
          }
          description "Reference a redundancy group " +
                      "properties template";
        }
        uses redundancy-group-properties-grp;
      }
    }
  }

  grouping vpws-endpoint-grp {
    description
      "A vpws-endpoint could either be an ac or a pw";
    choice ac-or-pw-or-redundancy-grp {
      description "A choice ofattachment circuit or " +
                  "pseudowire or redundancy group";
      case ac {
        leaf ac {
          type string;
          description "Name of attachment circuit.  This " +
                      "field is intended to reference " +



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                      "standardized layer-2 definitions.";
        }
      }
      case pw {
        leaf pw {
          type leafref {
            path "../../pw/name";
          }
          description "reference to a pseudowire";
        }
      }
      case redundancy-grp {
        choice primary {
          mandatory true;
          description "primary options";
          case primary-pw  {
            leaf primary-pw {
              type leafref {
                path "../../pw/name";
              }
              description "primary pseudowire";
            }
          }
          case primary-ac {
            leaf primary-ac {
              type string;
              description "Name of primary attachment circuit.  " +
                          "This field is intended to reference " +
                          "standardized layer-2 definitions.";
            }
          }
        }
        choice backup {
          mandatory true;
          description "backup options";
          case backup-pw {
            leaf backup-pw {
              type leafref {
                path "../../pw/name";
              }
              description "backup pseudowire";
            }
          }
          case backup-ac {
            leaf backup-ac {
              type string;
              description "Name of backup attachment circuit.  " +
                          "This field is intended to reference " +



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                          "standardized layer-2 definitions.";
            }
          }
        }
        leaf template {
          type leafref {
            path "/l2vpn/common/redundancy-group-templates" +
                 "/redundancy-group-template/name";
          }
          description "Reference a redundancy group " +
                      "properties template";
        }
        uses redundancy-group-properties-grp;
      }
    }
  }

  grouping vpws-endpoint-state-grp {
    description
      "A vpws-endpoint could either be an ac or a pw";
    choice ac-or-pw-or-redundancy-grp {
      description "A choice ofattachment circuit or " +
                  "pseudowire or redundancy group";
      case ac {
        container ac {
          description "ac";
          uses ac-state-grp;
        }
      }
      case pw {
        container pw {
          description "pw";
          uses vpws-pw-state-grp;
        }
      }
      case redundancy-grp {
        choice primary {
          mandatory true;
          description "primary options";
          case primary-pw  {
            container primary-pw {
              description "primary pseudowire";
              uses vpws-pw-state-grp;
            }
          }
          case primary-ac {
            leaf primary-ac-name {
              type string;



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              description "Name of primary attachment circuit.  " +
                          "This field is intended to reference " +
                          "standardized layer-2 definitions.";
            }
          }
        }
        choice backup {
          mandatory true;
          description "backup options";
          case backup-pw {
            container backup-pw {
              description "backup pseudowire";
              uses vpws-pw-state-grp;
            }
          }
          case backup-ac {
            leaf backup-ac-name {
              type string;
              description "Name of backup attachment circuit.  " +
                          "This field is intended to reference " +
                          "standardized layer-2 definitions.";
            }
          }
        }
        uses redundancy-group-properties-grp;
      }
    }
  }

  grouping vpls-pw-state-grp {
    description "vpls-pw-state-grp";
    leaf name {
      type string;
      description "pseudowire name";
    }
    leaf state {
      type operational-state-type;
      description "pseudowire up/down state";
    }
    leaf mtu {
      type uint32;
      description "pseudowire mtu";
    }
    leaf mac-withdraw {
      type boolean;
      description "MAC withdraw is enabled (true) or disabled (false)";
    }
    leaf cw-negotiation {



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      type cw-negotiation-type;
      description "cw-negotiation";
    }
    leaf discovery-type {
      type l2vpn-discovery-type;
      description "VPLS discovery type";
    }
    leaf signaling-type {
      type l2vpn-signaling-type;
      description "VPLS signaling type";
    }
    leaf peer-ip {
      type inet:ip-address;
      description "peer IP address";
    }
    leaf pw-id {
      type uint32;
      description "pseudowire id";
    }
    leaf transmit-label {
      type uint32;
      description "transmit lable";
    }
    leaf receive-label {
      type uint32;
      description "receive label";
    }
    leaf tunnel-policy {
      type string;
      description "tunnel policy name";
    }
  }

  grouping ac-state-grp {
    description "vpls-ac-state-grp";
    leaf name {
      type string;
      description "attachment circuit name";
    }
    leaf state {
      type operational-state-type;
      description "attachment circuit up/down state";
    }
  }

  grouping vpws-pw-state-grp {
    description "vpws-pw-state-grp";
    leaf name {



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      type string;
      description "pseudowire name";
    }
    leaf state {
      type operational-state-type;
      description "pseudowire operation state up/down";
    }
    leaf mtu {
      type uint32;
      description "PW MTU";
    }
    leaf mac-withdraw {
      type boolean;
      description "MAC withdraw is enabled (ture) or disabled (false)";
    }
    leaf cw-negotiation {
      type cw-negotiation-type;
      description "Override the control-word negotiation " +
                  "preference specified in the " +
                  "pseudowire template.";
    }
    leaf vccv-ability {
      type boolean;
      description "vccv-ability";
    }
    leaf tunnel-policy {
      type string;
      description "Used to override the tunnel policy name " +
                  "specified in the pseduowire template";
    }
    leaf request-vlanid {
      type uint16;
      description "request vlanid";
    }
    leaf vlan-tpid {
      type string;
      description "vlan tpid";
    }
    leaf ttl {
      type uint8;
      description "time-to-live";
    }
    uses pw-type-grp;
  }

  /* L2VPN YANG Model */

  container l2vpn {



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    description "l2vpn";
    container common {
      description "common l2pn attributes";
      container pw-templates {
        description "pw-templates";
        list pw-template {
          key "name";
          description "pw-template";
          leaf name {
            type string;
            description "name";
          }
          leaf mtu {
            type uint32;
            description "pseudowire mtu";
          }
          leaf cw-negotiation {
            type cw-negotiation-type;
            default "preferred";
            description
              "control-word negotiation preference";
          }
          leaf tunnel-policy {
            type string;
            description "tunnel policy name";
          }
        }
      }
      container redundancy-group-templates {
        description "redundancy group templates";
        list redundancy-group-template {
          key "name";
          description "redundancy-group-template";
          leaf name {
            type string;
            description "name";
          }
          uses redundancy-group-properties-grp;
        }
      }
    }
    container bridge-table-instances {
      /* To be fleshed out in future revisions */
      description "bridge-table-instances";
      list bridge-table-instance {
        key "name";
        description "A bridge table instance";
        leaf name {



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          type string;
          description "Name of a bridge table instance";
        }
        leaf mtu {
          type uint32;
          description "Bridge MTU";
        }
        leaf mac-aging-timer {
          type uint32;
          description "mac-aging-timer";
        }
        uses pbb-parameters-grp;
        uses bgp-parameters-grp;
        leaf evpn-instance {
          type string;
          description "Eventual reference to standard EVPN instance";
        }
        list pw {
          key "name";
          description "pseudowire";
          leaf name {
            type string;
            description "pseudowire name";
          }
          leaf template {
            type pw-template-ref;
            description "pseudowire template";
          }
          leaf mtu {
            type uint32;
            description "PW MTU";
          }
          leaf mac-withdraw {
            type boolean;
            default false;
            description "Enable (true) or disable (false) MAC withdraw";
          }
          leaf cw-negotiation {
            type cw-negotiation-type;
            description "cw-negotiation";
          }
          leaf discovery-type {
            type l2vpn-discovery-type;
            description "VPLS discovery type";
          }
          leaf signaling-type {
            type l2vpn-signaling-type;
            description "VPLS signaling type";



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          }
          leaf peer-ip {
            type inet:ip-address;
            description "peer IP address";
          }
          leaf pw-id {
            type uint32;
            description "pseudowire id";
          }
          leaf transmit-label {
            type uint32;
            description "transmit lable";
          }
          leaf receive-label {
            type uint32;
            description "receive label";
          }
          leaf tunnel-policy {
            type string;
            description "tunnel policy name";
          }
        }
        list endpoint {
          key "id";
          leaf id {
            type uint16;
            description "endpoint ID";
          }
          leaf split-horizon-group {
            type string;
            description "Identify a split horizon group";
          }
          uses bridge-table-instance-endpoint-grp;
          description "List of endpoints";
        }
      }
    }
    container vpws-instances {
      description "vpws-instances";
      list vpws-instance {
        key "name";
        description "A VPWS instance";
        leaf name {
          type string;
          description "Name of VPWS instance";
        }
        leaf description {
          type string;



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          description "Description of the VPWS instance";
        }
        leaf mtu {
          type uint32;
          description "VPWS MTU";
        }
        leaf mac-aging-timer {
          type uint32;
          description "mac-aging-timer";
        }
        leaf service-type {
          type l2vpn-service-type;
          default ethernet;
          description "VPWS service type";
        }
        leaf discovery-type {
          type l2vpn-discovery-type;
          default manual;
          description "VPWS discovery type";
        }
        leaf signaling-type {
          type l2vpn-signaling-type;
          mandatory true;
          description "VPWS signaling type";
        }
        uses bgp-parameters-grp;
        list pw {
          key "name";
          description "pseudowire";
          leaf name {
            type string;
            description "pseudowire name";
          }
          leaf template {
            type pw-template-ref;
            description "pseudowire template";
          }
          leaf mtu {
            type uint32;
            description "PW MTU";
          }
          leaf mac-withdraw {
            type boolean;
            default false;
            description "Enable (true) or disable (false) MAC withdraw";
          }
          leaf cw-negotiation {
            type cw-negotiation-type;



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            default "preferred";
            description "Override the control-word negotiation " +
                        "preference specified in the " +
                        "pseudowire template.";
          }
          leaf vccv-ability {
            type boolean;
            description "vccvability";
          }
          leaf tunnel-policy {
            type string;
            description "Used to override the tunnel policy name " +
                        "specified in the pseduowire template";
          }
          leaf request-vlanid {
            type uint16;
            description "request vlanid";
          }
          leaf vlan-tpid {
            type string;
            description "vlan tpid";
          }
          leaf ttl {
            type uint8;
            description "time-to-live";
          }
          uses pw-type-grp;
        }
        container endpoint-a {
          description "endpoint-a";
          uses vpws-endpoint-grp;
        }
        container endpoint-z {
          description "endpoint-z";
          uses vpws-endpoint-grp;
        }
      }
    }
  }

  container l2vpn-state {
    config false;
    description "l2vpn state";
    container bridge-table-instances-state {
      /* To be fleshed out in future revisions */
      description "bridge-table-instances-state";
      list bridge-table-instance-state {
        key "name";



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        description "A bridge table instance's state data";
        leaf name {
          type string;
          description "Name of a bridge table instance";
        }
        leaf mtu {
          type uint32;
          description "Bridge MTU";
        }
        leaf mac-aging-timer {
          type uint32;
          description "mac-aging-timer";
        }
        uses pbb-parameters-state-grp;
        uses bgp-parameters-grp;
        leaf evpn-instance-name {
          type string;
          description "Name of associated an EVPN instance";
        }
        list endpoint {
          key "id";
          leaf id {
            type uint16;
            description "endpoint ID";
          }
          leaf split-horizon-group {
            type string;
            description "Identify a split horizon group";
          }
          choice ac-or-pw-or-redundancy-grp {
            description "A choice ofattachment circuit or " +
                        "pseudowire or redundancy group";
            case ac {
              list ac {
                key "name";
                uses ac-state-grp;
                description "A list of attachment circuits";
              }
              description "attachment circuit endpoint state";
            }
            case pw {
              list pw {
                key "name";
                uses vpls-pw-state-grp;
                description "A list of pseudowires";
              }
              description "pseudowire endpoint state";
            }



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            case redundancy-grp {
              choice primary {
                mandatory true;
                description "primary options";
                case primary-pw {
                  description "primary-pw";
                  list primary-pw {
                    key "name";
                    uses vpls-pw-state-grp;
                    description "A list of primary pseudowires";
                  }
                }
                case primary-ac {
                  description "primary-ac";
                  container primary-ac {
                    description "primary-ac";
                    uses ac-state-grp;
                  }
                }
              }
              choice backup {
                description "backup options";
                case backup-pw {
                  list backup-pw {
                    key "name";
                    uses vpls-pw-state-grp;
                    leaf precedence {
                      type uint32;
                      description "precedence of the pseudowire";
                    }
                    description "A list of backup pseudowires";
                  }
                }
                case backup-ac {
                  description "backup-ac";
                  container backup-ac {
                    description "primary-ac";
                    uses ac-state-grp;
                  }
                }
              }
              uses redundancy-group-properties-grp;
            }
          }
          description "List of endpoints";
        }
      }
    }



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    container vpws-instances-state {
      description "vpws-instances-state";
      list vpws-instance-state {
        key "name";
        description "A VPWS instance's state data";
        leaf name {
          type string;
          description "Name of VPWS instance";
        }
        leaf mtu {
          type uint32;
          description "VPWS MTU";
        }
        leaf mac-aging-timer {
          type uint32;
          description "mac-aging-timer";
        }
        leaf service-type {
          type l2vpn-service-type;
          default ethernet;
          description "VPWS service type";
        }
        leaf discovery-type {
          type l2vpn-discovery-type;
          default manual;
          description "VPWS discovery type";
        }
        leaf signaling-type {
          type l2vpn-signaling-type;
          mandatory true;
          description "VPWS signaling type";
        }
        uses bgp-parameters-grp;
        container endpoint-a {
          description "endpoint-a";
          uses vpws-endpoint-state-grp;
        }
        container endpoint-z {
          description "endpoint-z";
          uses vpws-endpoint-state-grp;
        }
      }
    }
  }
}

<CODE ENDS>




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                                 Figure 3

6.  Security Considerations

   The configuration, state, action and notification data defined in
   this document are designed to be accessed via the NETCONF protocol
   [RFC6241].  The lowest NETCONF layer is the secure transport layer
   and the mandatory-to-implement secure transport is SSH [RFC6242].
   The NETCONF access control model [RFC6536] provides means to restrict
   access for particular NETCONF users to a pre-configured subset of all
   available NETCONF protocol operations and content.

   The security concerns listed above are, however, no different than
   faced by other routing protocols.  Hence, this draft does not change
   any underlying security issues inherent in [I-D.ietf-netmod-routing-
   cfg]

7.  IANA Considerations

   None.

8.  Acknowledgments

   The authors would like to acknowledge TBD for their useful comments.

9.  References

9.1.  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,
              <http://www.rfc-editor.org/info/rfc2119>.

9.2.  Informative References

   [RFC3916]  Xiao, X., Ed., McPherson, D., Ed., and P. Pate, Ed.,
              "Requirements for Pseudo-Wire Emulation Edge-to-Edge
              (PWE3)", RFC 3916, DOI 10.17487/RFC3916, September 2004,
              <http://www.rfc-editor.org/info/rfc3916>.

   [RFC3985]  Bryant, S., Ed. and P. Pate, Ed., "Pseudo Wire Emulation
              Edge-to-Edge (PWE3) Architecture", RFC 3985,
              DOI 10.17487/RFC3985, March 2005,
              <http://www.rfc-editor.org/info/rfc3985>.






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   [RFC4385]  Bryant, S., Swallow, G., Martini, L., and D. McPherson,
              "Pseudowire Emulation Edge-to-Edge (PWE3) Control Word for
              Use over an MPLS PSN", RFC 4385, DOI 10.17487/RFC4385,
              February 2006, <http://www.rfc-editor.org/info/rfc4385>.

   [RFC4446]  Martini, L., "IANA Allocations for Pseudowire Edge to Edge
              Emulation (PWE3)", BCP 116, RFC 4446,
              DOI 10.17487/RFC4446, April 2006,
              <http://www.rfc-editor.org/info/rfc4446>.

   [RFC4447]  Martini, L., Ed., Rosen, E., El-Aawar, N., Smith, T., and
              G. Heron, "Pseudowire Setup and Maintenance Using the
              Label Distribution Protocol (LDP)", RFC 4447,
              DOI 10.17487/RFC4447, April 2006,
              <http://www.rfc-editor.org/info/rfc4447>.

   [RFC4448]  Martini, L., Ed., Rosen, E., El-Aawar, N., and G. Heron,
              "Encapsulation Methods for Transport of Ethernet over MPLS
              Networks", RFC 4448, DOI 10.17487/RFC4448, April 2006,
              <http://www.rfc-editor.org/info/rfc4448>.

   [RFC4664]  Andersson, L., Ed. and E. Rosen, Ed., "Framework for Layer
              2 Virtual Private Networks (L2VPNs)", RFC 4664,
              DOI 10.17487/RFC4664, September 2006,
              <http://www.rfc-editor.org/info/rfc4664>.

   [RFC4665]  Augustyn, W., Ed. and Y. Serbest, Ed., "Service
              Requirements for Layer 2 Provider-Provisioned Virtual
              Private Networks", RFC 4665, DOI 10.17487/RFC4665,
              September 2006, <http://www.rfc-editor.org/info/rfc4665>.

   [RFC4761]  Kompella, K., Ed. and Y. Rekhter, Ed., "Virtual Private
              LAN Service (VPLS) Using BGP for Auto-Discovery and
              Signaling", RFC 4761, DOI 10.17487/RFC4761, January 2007,
              <http://www.rfc-editor.org/info/rfc4761>.

   [RFC4762]  Lasserre, M., Ed. and V. Kompella, Ed., "Virtual Private
              LAN Service (VPLS) Using Label Distribution Protocol (LDP)
              Signaling", RFC 4762, DOI 10.17487/RFC4762, January 2007,
              <http://www.rfc-editor.org/info/rfc4762>.

   [RFC5003]  Metz, C., Martini, L., Balus, F., and J. Sugimoto,
              "Attachment Individual Identifier (AII) Types for
              Aggregation", RFC 5003, DOI 10.17487/RFC5003, September
              2007, <http://www.rfc-editor.org/info/rfc5003>.






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   [RFC5254]  Bitar, N., Ed., Bocci, M., Ed., and L. Martini, Ed.,
              "Requirements for Multi-Segment Pseudowire Emulation Edge-
              to-Edge (PWE3)", RFC 5254, DOI 10.17487/RFC5254, October
              2008, <http://www.rfc-editor.org/info/rfc5254>.

   [RFC5659]  Bocci, M. and S. Bryant, "An Architecture for Multi-
              Segment Pseudowire Emulation Edge-to-Edge", RFC 5659,
              DOI 10.17487/RFC5659, October 2009,
              <http://www.rfc-editor.org/info/rfc5659>.

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

   [RFC6073]  Martini, L., Metz, C., Nadeau, T., Bocci, M., and M.
              Aissaoui, "Segmented Pseudowire", RFC 6073,
              DOI 10.17487/RFC6073, January 2011,
              <http://www.rfc-editor.org/info/rfc6073>.

   [RFC6074]  Rosen, E., Davie, B., Radoaca, V., and W. Luo,
              "Provisioning, Auto-Discovery, and Signaling in Layer 2
              Virtual Private Networks (L2VPNs)", RFC 6074,
              DOI 10.17487/RFC6074, January 2011,
              <http://www.rfc-editor.org/info/rfc6074>.

   [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,
              <http://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,
              <http://www.rfc-editor.org/info/rfc6242>.

   [RFC6391]  Bryant, S., Ed., Filsfils, C., Drafz, U., Kompella, V.,
              Regan, J., and S. Amante, "Flow-Aware Transport of
              Pseudowires over an MPLS Packet Switched Network",
              RFC 6391, DOI 10.17487/RFC6391, November 2011,
              <http://www.rfc-editor.org/info/rfc6391>.

   [RFC6423]  Li, H., Martini, L., He, J., and F. Huang, "Using the
              Generic Associated Channel Label for Pseudowire in the
              MPLS Transport Profile (MPLS-TP)", RFC 6423,
              DOI 10.17487/RFC6423, November 2011,
              <http://www.rfc-editor.org/info/rfc6423>.





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   [RFC6478]  Martini, L., Swallow, G., Heron, G., and M. Bocci,
              "Pseudowire Status for Static Pseudowires", RFC 6478,
              DOI 10.17487/RFC6478, May 2012,
              <http://www.rfc-editor.org/info/rfc6478>.

   [RFC6536]  Bierman, A. and M. Bjorklund, "Network Configuration
              Protocol (NETCONF) Access Control Model", RFC 6536,
              DOI 10.17487/RFC6536, March 2012,
              <http://www.rfc-editor.org/info/rfc6536>.

   [RFC6624]  Kompella, K., Kothari, B., and R. Cherukuri, "Layer 2
              Virtual Private Networks Using BGP for Auto-Discovery and
              Signaling", RFC 6624, DOI 10.17487/RFC6624, May 2012,
              <http://www.rfc-editor.org/info/rfc6624>.

   [RFC7041]  Balus, F., Ed., Sajassi, A., Ed., and N. Bitar, Ed.,
              "Extensions to the Virtual Private LAN Service (VPLS)
              Provider Edge (PE) Model for Provider Backbone Bridging",
              RFC 7041, DOI 10.17487/RFC7041, November 2013,
              <http://www.rfc-editor.org/info/rfc7041>.

   [RFC7361]  Dutta, P., Balus, F., Stokes, O., Calvignac, G., and D.
              Fedyk, "LDP Extensions for Optimized MAC Address
              Withdrawal in a Hierarchical Virtual Private LAN Service
              (H-VPLS)", RFC 7361, DOI 10.17487/RFC7361, September 2014,
              <http://www.rfc-editor.org/info/rfc7361>.

Authors' Addresses

   Himanshu Shah
   Ciena Corporation

   Email: hshah@ciena.com


   Patrice Brissette
   Cisco Systems, Inc.

   Email: pbrisset@cisco.com


   Reshad Rahman
   Cisco Systems, Inc.

   Email: rrahman@cisco.com






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   Kamran Raza
   Cisco Systems, Inc.

   Email: skraza@cisco.com


   Zhenbin Li
   Huawei Technologies

   Email: lizhenbin@huawei.com


   Zhuang Shunwan
   Huawei Technologies

   Email: Zhuangshunwan@huawei.com


   Wang Haibo
   Huawei Technologies

   Email: rainsword.wang@huawei.com


   Ing-When Chen
   Ericsson

   Email: ichen@kuatrotech.com


   Sajjad Ahmed
   Ericsson

   Email: sajjad.ahmed@ericsson.com


   Mathew Bocci
   Alcatel-Lucent

   Email: mathew.bocci@alcatel-lucent.com


   Jonathan Hardwick
   Metaswitch

   Email: jonathan.hardwick@metaswitch.com





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   Santosh Esale
   Juniper Networks

   Email: sesale@juniper.net


   Kishore Tiruveedhula
   Juniper Networks

   Email: kishoret@juniper.net


   Tapraj Singh
   Juniper Networks

   Email: tsingh@juniper.net


   Iftekar Hussain
   Infinera Corporation

   Email: ihussain@infinera.com


   Bin Wen
   Comcast

   Email: Bin_Wen@cable.comcast.com


   Jason Walker
   Comcast

   Email: jason_walker2@cable.comcast.com


   Nick Delregno
   Verizon

   Email: nick.deregno@verizon.com


   Luay Jalil
   Verizon

   Email: luay.jalil@verizon.com





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   Maria Joecylyn
   Verizon

   Email: joecylyn.malit@verizon.com















































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