BESS Working Group                                          P. Brissette
                                                               A.Sajassi
Internet Draft                                              Cisco System
Intended Status: Proposed Standard                               H. Shah
Expires: April August 24, 2018                               Ciena Corporation
                                                                   Z. Li
                                                     Huawei Technologies
                                                                 I. Chen
                                                                   Jabil
                                                         K. Tiruveedhula
                                                        Juniper Networks
                                                              I. Hussain
                                                    Infinera Corporation
                                                              J. Rabadan
                                                                   Nokia

                                                        October 21, 2017

                                                       February 20, 2018

                        Yang Data Model for EVPN
                      draft-ietf-bess-evpn-yang-03
                      draft-ietf-bess-evpn-yang-04

Abstract

   This document describes a YANG data model for Ethernet VPN services.
   The model is agnostic of the underlay. It apply to MPLS as well as to
   VxLAN encapsulation. The model is also agnostic of the services
   including E-LAN, E-LINE and E-TREE services. This document mainly
   focuses on EVPN and Ethernet-Segment instance framework.

Status of this Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as
   Internet-Drafts.

   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."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/1id-abstracts.html

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   http://www.ietf.org/shadow.html

Copyright and License Notice
   Copyright (c) 2017 2018 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.

Convention

   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].

Table of Contents

   1. Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  4  2
   2. Specification of Requirements . . . . . . . . . . . . . . . . .  5  3
   3. EVPN YANG Model . . . . . . . . . . . . . . . . . . . . . . . .  5  4
     3.1.  Overview . . . . . . . . . . . . . . . . . . . . . . . . .  5  4
     3.2 Ethernet-Segment Model . . . . . . . . . . . . . . . . . . .  6  4
     3.3 EVPN Model . . . . . . . . . . . . . . . . . . . . . . . . .  6  5
   4. YANG Module . . . . . . . . . . . . . . . . . . . . . . . . . .  7  8
     4.1 Ethernet Segment Yang Module . . . . . . . . . . . . . . . .  7  9
     4.2 EVPN Yang Module . . . . . . . . . . . . . . . . . . . . . .  9 14
   5. Security Considerations . . . . . . . . . . . . . . . . . . . . 11 25
   6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 11 26
   7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 11
   8. References  . . . . . . . . . . . . . . . . . . . . . . . . . . 12
     8.1. 26
     7.1. Normative References Reference . . . . . . . . . . . . . . . . . . . 12
     8.2. . 26
     7.2. Informative References  . . . . . . . . . . . . . . . . . . 12 26
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 12 27

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 Ethernet VPN services
   (EVPN) [RFC7432], Provider Backbone Bridging Combined with Ethernet
   VPN (PBB-EVPN) [RFC7623] as well as other WG draft such as EVPN-VPWS,
   etc.  The EVPN services runs over MPLS and VxLAN underlay.

   The Yang data model in this document defines Ethernet VPN based
   services.  The model leverages the definitions used in other IETF
   Yang draft such as L2VPN Yang.

   The goal is to propose a data object model consisting of building
   blocks that can be assembled in different order to realize different
   EVPN-based services. The definition work is undertaken initially by a
   smaller working group with members representing various vendors and
   service providers.  The EVPN basic framework consist of two modules:
   EVPN and Ethernet-Segment. These models are completely orthogonal.
   They usually work in pair but user can definitely use one or the
   other for its own need.

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

      o  Configuration

      o  Operational State

      o  Notifications

   The document is organized to first define the data model for the
   configuration, operational state and notifications of EVPN and
   Ethernet-Segment.

   The EVPN data object model defined in this document uses the instance
   centric approach whereby EVPN service attributes are specified for a
   given EVPN instance.

   The Ethernet-Segment data object model defined in this document refer
   to a specific interface. That interface can be a physical interface,
   a bundle interface or virtual interface. The latter includes
   attachment-circuit and pseudowire. The purpose of creating a separate
   module is due to the fact that it can be used without having the need
   to have EVPN configured as layer 2 2/3 service. For example, an access
   node can be dual-homed to two service nodes servicing a VPLS or an
   IPVPN core. The access connectivity can be represented by an
   Ethernet-Segment where EVPN BGP DF election is performed over both
   service nodes. The
   core remains VPLS where no EVPN instance is required.
2. 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].

3. EVPN YANG Model

3.1.  Overview

      Two top level module, Ethernet-Segment and EVPN, are defined. The
   Ethernet-Segment contains a list of interface to which any Ethernet-
   Segment attributes are configured/applied.

      The EVPN module has 2 two main containers: common and instance. The
   first one has common attributes to all VPNs where as the latter has
   attributes specific to an EVI. EVI (EVPN instance). This document state
   the scope of the EVPN object models definition. 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 EVPN: RFC 7209 [RFC7209]
      o   EVPN: RFC 7432 [RFC7432]
      o   PBB-EVPN: RFC 7623 [RFC7623]
      o   EVPN-VPWS: RFC 8214 [RFC8214]

   The integration with L2VPN instance Yang model is being done as part
   of the L2VPN Yang model.
   Following documents will be covered at that time:
      o   E-TREE Support in EVPN & PBB-EVPN:
      draft-ietf-bess-evpn-etree
      o   (PBB-)EVPN Seamless Integration with (PBB-)VPLS:
      draft-ietf-bess-evpn-vpls-seamless-integ
      o   EVPN Virtual Ethernet Segment:
      draft-sajassi-bess-evpn-virtual-eth-segment
      o   IP Prefix Advertisement in EVPN:
      draft-ietf-bess-evpn-prefix-advertisement
      o   VXLAN DCI Using EVPN:
      draft-boutros-l2vpn-vxlan-evpn
      o   A Network Virtualization Overlay Solution using EVPN:
      draft-ietf-bess-evpn-overlay
      o   Interconnect Solution for EVPN Overlay networks:
      draft-ietf-bess-dci-evpn-overlay
      o   Integrated Routing and Bridging in EVPN:
      draft-ietf-bess-evpn-inter-subnet-forwarding

3.2 Ethernet-Segment Model

   The Ethernet-Segment data model has a list of ES where each refer to
   an interface. All attributes are optional due to auto-sensing default
   mode where all values are auto-derive from the network connectivity.

   module: ietf-ethernet-segment
       +--rw ethernet-segments
          +--rw ethernet-segment* [name]
             +--rw name                           string
             +--ro service-type?                  string
             +--ro status?                        status-type
             +--rw (ac-or-pw)?
             |  +--:(ac)
             |  |  +--rw ac*                            string                            if:interface-ref
             |  +--:(pw)
             |     +--rw pw*                           pw:pseudowire-ref
             +--ro interface-status?              status-type
             +--rw ethernet-segment-identifier?   uint32
             +--rw (active-mode)
             |  +--:(single-active)
             |  |  +--rw single-active-mode?            empty
             |  +--:(all-active)
             |     +--rw all-active-mode?               empty
             +--rw pbb-parameters {ethernet-segment-pbb-params}?
             |  +--rw backbone-src-mac?   yang:mac-address
             +--rw bgp-parameters
             |  +--rw common
             |     +--rw rd-rt* [route-distinguisher]
                                {ethernet-segment-bgp-params}?
             |        +--rw route-distinguisher
                            rt-types:route-distinguisher
             |        +--rw vpn-target* [route-target]
             |           +--rw route-target
                               rt-types:route-target
             |           +--rw route-target-type
                               rt-types:route-target-type
             +--rw df-election
             |  +--rw df-election-method?   df-election-method-type
             |  +--rw preference?           uint16
             |  +--rw revertive?            boolean
             |  +--rw election-wait-time?   uint32
             +--rw ead-evi-route?                 boolean
             +--ro esi-label?                     string
             +--ro member*
             |  +--ro ip-address?   inet:ip-address
             +--ro df*
                +--ro service-identifier?   uint32
                +--ro vlan?                 uint32
                +--ro ip-address?           inet:ip-address

3.3 EVPN Model

   The evpn-instances container contains a list of evpn-instance. Each
   entry of the evpn-instance represents a different Ethernet VPN and it
   is represented by a EVI. Again, mainly all attributes are optional
   for the same reason as for the Ethernet-Segment module.

   module: ietf-evpn
       +--rw evpn
          +--rw common
          |  +--rw (replication-type)?
          |     +--:(ingress-replication)
          |     |  +--rw ingress-replication?   boolean
          |     +--:(p2mp-replication)
          |        +--rw p2mp-replication?      boolean
          +--rw evpn-instances
             +--rw evpn-instance* [name]
                +--rw name                                string
                +--rw evi?                                uint32
                +--rw pbb-parameters {evpn-pbb-params}?
                |  +--rw source-bmac?   yang:hex-string
                +--rw bgp-parameters
                |  +--rw common
                |     +--rw rd-rt* [route-distinguisher]
                                   {evpn-bgp-params}?
                |        +--rw route-distinguisher
                |        |     rt-types:route-distinguisher
                |        +--rw vpn-target* [route-target]
                |           +--rw route-target
                                        rt-types:route-target
                |           +--rw route-target-type
                                        rt-types:route-target-type
                +--rw arp-proxy?                          boolean
                +--rw arp-suppression?                    boolean
                +--rw nd-proxy?                           boolean
                +--rw nd-suppression?                     boolean
                +--rw underlay-multicast?                 boolean
                +--rw flood-unknown-unicast-supression?   boolean
                +--rw vpws-vlan-aware?                    boolean
                +--ro routes
                |  +--ro ethernet-auto-discovery-route*
                |  |  +--ro rd-rt* [route-distinguisher]
                |  |  |  +--ro route-distinguisher
                               rt-types:route-distinguisher
                |  |  |  +--ro vpn-target* [route-target]
                |  |  |     +--ro route-target    rt-types:route-target
                |  |  +--ro ethernet-segment-identifier?   uint32
                |  |  +--ro ethernet-tag?                  uint32
                |  |  +--ro path*
                |  |     +--ro next-hop?   inet:ip-address
                |  |     +--ro label?      rt-types:mpls-label
                |  |     +--ro detail
                |  |        +--ro attributes
                |  |        |  +--ro extended-community*   string
                |  |        +--ro bestpath?     empty
                |  +--ro mac-ip-advertisement-route*
                |  |  +--ro rd-rt* [route-distinguisher]
                |  |  |  +--ro route-distinguisher
                               rt-types:route-distinguisher
                |  |  |  +--ro vpn-target* [route-target]
                |  |  |     +--ro route-target
                                  rt-types:route-target
                |  |  +--ro ethernet-segment-identifier?   uint32
                |  |  +--ro ethernet-tag?                  uint32
                |  |  +--ro mac-address?                 yang:hex-string
                |  |  +--ro mac-address-length?            uint8
                |  |  +--ro ip-prefix?                   inet:ip-prefix
                |  |  +--ro path*
                |  |     +--ro next-hop?   inet:ip-address
                |  |     +--ro label?      rt-types:mpls-label
                |  |     +--ro label2?     rt-types:mpls-label
                |  |        +--ro detail
                |  |        +--ro attributes
                |  |        |  +--ro extended-community*   string
                |  |        +--ro bestpath?     empty
                |  +--ro inclusive-multicast-ethernet-tag-route*
                |  |  +--ro rd-rt* [route-distinguisher]
                |  |  |  +--ro route-distinguisher
                               rt-types:route-distinguisher
                |  |  |  +--ro vpn-target* [route-target]
                |  |  |     +--ro route-target
                                  rt-types:route-target
                |  |  +--ro ethernet-segment-identifier?   uint32
                |  |  +--ro originator-ip-prefix?        inet:ip-prefix
                |  |  +--ro path*
                |  |     +--ro next-hop?   inet:ip-address
                |  |     +--ro label?      rt-types:mpls-label
                |  |     +--ro detail
                |  |        +--ro attributes
                |  |        |  +--ro extended-community*   string
                |  |        +--ro bestpath?     empty
                |  +--ro ethernet-segment-route*
                |  |  +--ro rd-rt* [route-distinguisher]
                |  |  |  +--ro route-distinguisher
                               rt-types:route-distinguisher
                |  |  |  +--ro vpn-target* [route-target]
                |  |  |     +--ro route-target
                                  rt-types:route-target
                |  |  +--ro ethernet-segment-identifier?   uint32
                |  |  +--ro originator-ip-prefix?        inet:ip-prefix
                |  |  +--ro path*
                |  |     +--ro next-hop?   inet:ip-address
                |  |     +--ro detail
                |  |        +--ro attributes
                |  |        |  +--ro extended-community*   string
                |  |        +--ro bestpath?     empty
                |  +--ro ip-prefix-route*
                |     +--ro rd-rt* [route-distinguisher]
                |     |  +--ro route-distinguisher
                               rt-types:route-distinguisher
                |     |  +--ro vpn-target* [route-target]
                |     |     +--ro route-target    rt-types:route-target
                |     +--ro ethernet-segment-identifier?   uint32
                |     +--ro ip-prefix?                   inet:ip-prefix
                |     +--ro path*
                |        +--ro next-hop?   inet:ip-address
                |        +--ro label?      rt-types:mpls-label
                |        +--ro detail
                |           +--ro attributes
                |           |  +--ro extended-community*   string
                |           +--ro bestpath?     empty
                +--ro statistics
                   +--ro tx-count?   uint32
                   +--ro rx-count?   uint32
                   +--ro detail
                      +--ro broadcast-tx-count?         uint32
                      +--ro broadcast-rx-count?         uint32
                      +--ro multicast-tx-count?         uint32
                      +--ro multicast-rx-count?         uint32
                      +--ro unknown-unicast-tx-count?   uint32
                      +--ro unknown-unicast-rx-count?   uint32
     augment /pw:pseudowires/pw:pseudowire/pw:pw-type:
       +--:(evpn-pw)
          +--rw evpn-pw
             +--rw remote-id?   uint32
             +--rw local-id?    uint32
     augment /l2vpn:l2vpn/l2vpn:instances/l2vpn:instance:
     /ni:network-instances/ni:network-instance/ni:ni-type/l2vpn:l2vpn:
       +--rw evpn-instance?   evpn-instance-ref
     augment /l2vpn:l2vpn/l2vpn:instances/l2vpn:instance:
     /ni:network-instances/ni:network-instance/ni:ni-type/l2vpn:l2vpn:
       +--rw vpls-contstraints

     notifications:
       +---n evpn-state-change-notification
          +--ro evpn-instance?   evpn-instance-ref
          +--ro state?           identityref

4. YANG Module
      The EVPN configuration container is logically divided into
   following high level config configuration areas:

4.1 Ethernet Segment Yang Module

   <CODE BEGINS> file "ietf-ethernet-segment@2017-10-21.yang"
   module ietf-ethernet-segment { "ietf-ethernet-segment@2018-02-20.yang"
   module ietf-ethernet-segment {
     namespace "urn:ietf:params:xml:ns:yang:ietf-ethernet-segment";
     prefix "es";

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

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

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

     import ietf-interfaces {
       prefix "if";
     }

     import ietf-pseudowires {
       prefix "pw";
     }

     organization  "ietf";
     contact       "ietf";
     description   "ethernet segment";

     revision "2018-02-20" {
       description " - Change the type of attachment circuit to " +
                   "   if:interface-ref " +
                   "";
       reference   "";
     }

     revision "2017-10-21" {
       description " - Updated ethernet segment's AC/PW members to " +
                   "   accommodate more than one AC or more than one " +
                   "   PW " +
                   " - Added the new preference based DF election " +
                   "   method " +
                   " - Referenced pseudowires in the new " +
                   "   ietf-pseudowires.yang model " +
                   " - Moved model to NMDA style specified in " +
                   "   draft-dsdt-nmda-guidelines-01.txt " +
                   "";
       reference   "";
     }

     revision "2017-03-08" {
       description " - Updated to use BGP parameters from " +
                   "   ietf-routing-types.yang instead of from " +
                   "   ietf-evpn.yang " +
                   " - Updated ethernet segment's AC/PW members to " +
                   "   accommodate more than one AC or more than one " +
                   "   PW " +
                   " - Added the new preference based DF election " +
                   "   method " +
                   "";
       reference   "";
     }

     revision "2016-07-08" {
       description "   - Added the configuration option to enable or " +
                   "     disable per-EVI/EAD route " +
                   "   - Added PBB parameter backbone-src-mac " +
                   "   - Added operational state branch, initially " +
                   "     to match the configuration branch" +
                   "";
       reference   "";
     }

     revision "2016-06-23" {
       description "WG document adoption";
       reference   "";
     }

     revision "2015-10-15" {
       description "Initial revision";
       reference   "";
     }

     /* Features */

     feature ethernet-segment-bgp-params {
       description "Ethernet segment's BGP parameters";
     }

     feature ethernet-segment-pbb-params {
       description "Ethernet segment's PBB parameters";

     }

     /* Typedefs */
     typedef status-type {
       type enumeration {
         enum up {
           description "Status is up";
         }
         enum down {
           description "Status is down";
         }
       }
       description "status type";
     }

     typedef df-election-method-type {
       type enumeration {
         enum default {
           value 0;
           description "The default DF election method";
         }
         enum highest-random-weight {
           value 1;
           description "The highest random weight (HRW) method";
           reference "draft-mohanty-bess-evpn-df-election";
         }
         enum preference {
           value 2;
           description "The preference based method";
           reference "draft-rabadan-bess-evpn-pref-df";
         }
       }
       description "The DF election method type";
     }

     /* EVPN Ethernet Segment YANG Model */

     container ethernet-segments {
       description "ethernet-segment";
       list ethernet-segment {
         key "name";
         leaf name {
           type string;
           description "Name of the ethernet segment";
         }
         leaf service-type {
           type string;
           config false;
           description "service-type";
         }
         leaf status {
           type status-type;
           config false;
           description "Ethernet segment status";
         }
         choice ac-or-pw {
           description "ac-or-pw";
           case ac {
             leaf-list ac {
               type string; if:interface-ref;
               description "Eventual reference to standard " +
                           "attachment circuit definition"; "Name of attachment circuit";
             }
           }
           case pw {
             leaf-list pw {
               type pw:pseudowire-ref;
               description "Reference to a pseudowire";
             }
           }
         }
         leaf interface-status {
           type status-type;
           config false;
           description "interface status";
         }
         leaf ethernet-segment-identifier {
           type uint32;
           description "Ethernet segment identifier (esi)";
         }
         choice active-mode {
           mandatory true;
           description "Choice of active mode";
           case single-active {
             leaf single-active-mode {
               type empty;
               description "single-active-mode";
             }
           }
           case all-active {
             leaf all-active-mode {
               type empty;
               description "all-active-mode";
             }
           }
         }
         container pbb-parameters {
           if-feature ethernet-segment-pbb-params;
           description "PBB configuration";
           leaf backbone-src-mac {
             type yang:mac-address;
             description "backbone-src-mac, only if this is a PBB";
           }
         }
         container bgp-parameters {
           description "BGP parameters";
           container common {
             description "BGP parameters common to all pseudowires";
             list rd-rt {
               if-feature ethernet-segment-bgp-params;
               key "route-distinguisher";
               leaf route-distinguisher {
                 type rt-types:route-distinguisher;
                 description "Route distinguisher";
               }
               uses rt-types:vpn-route-targets;
               description "A list of route distinguishers and " +
                           "corresponding VPN route targets";
             }
           }
         }
         container df-election {
           description "df-election";
           leaf df-election-method {
             type df-election-method-type;
             description "The DF election method";
           }
           leaf preference {
             when "../df-election-method = 'preference'" {
               description "The preference value is only applicable " +
                           "to the preference based method";
             }
             type uint16;
             description "The DF preference";
           }
           leaf revertive {
             when "../df-election-method = 'preference'" {
               description "The revertive value is only applicable " +
                           "to the preference method";
             }
             type boolean;
             default true;
             description "The 'preempt' or 'revertive' behavior";
           }
           leaf election-wait-time {
             type uint32;
             description "election-wait-time";
           }
         }
         leaf ead-evi-route {
           type boolean;
           default false;
           description "Enable (true) or disable (false) ead-evi-route";
         }
         leaf esi-label {
           type string;
           config false;
           description "esi-label";
         }
         list member {
           config false;
           leaf ip-address {
             type inet:ip-address;
             description "ip-address";
           }
           description "member of the ethernet segment";
         }
         list df {
           config false;
           leaf service-identifier {
             type uint32;
             description "service-identifier";
           }
           leaf vlan {
             type uint32;
             description "vlan";
           }
           leaf ip-address {
             type inet:ip-address;
             description "ip-address";
           }
           description "df of an evpn instance's vlan";
         }
         description "An ethernet segment";
       }
     }
   }
   <CODE ENDS>

4.2 EVPN Yang Module

   <CODE BEGINS> file "ietf-evpn@2017-10-21.yang" "ietf-evpn@2018-02-20.yang"
   module ietf-evpn {
     namespace "urn:ietf:params:xml:ns:yang:ietf-evpn";
     prefix "evpn";

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

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

     import ietf-l2vpn ietf-routing-types {
       prefix "l2vpn"; "rt-types";
     }

     import ietf-routing-types ietf-network-instance {
       prefix "rt-types"; "ni";
     }

     import ietf-l2vpn {
       prefix "l2vpn";
     }

     import ietf-pseudowires {
       prefix "pw";
     }

     organization  "ietf";
     contact       "ietf";
     description   "evpn";

     revision "2018-02-20" {
       description " - Incorporated ietf-network-instance model" +
                   "   on which ietf-l2vpn is now based " +
                   "";
       reference   "";
     }

     revision "2017-10-21" {
       description " - Modified the operational state augment " +
                   " - Renamed evpn-instances-state to evpn-instances" +
                   " - Added vpws-vlan-aware to an EVPN instance " +
                   " - Added a new augment to L2VPN to add EPVN " +
                   " - pseudowire for the case of EVPN VPWS " +
                   " - Added state change notification " +
                   "";
       reference   "";

     }

     revision "2017-03-13" {
       description " - Added an augment to base L2VPN model to " +
                   "   reference an EVPN instance " +
                   " - Reused ietf-routing-types.yang " +
                   "   vpn-route-targets grouping instead of " +
                   "   defining it in this module " +
                   "";
       reference   "";
     }

     revision "2016-07-08" {
       description " - Added operational state" +
                   " - Added a configuration knob to enable/disable " +
                   "   underlay-multicast " +
                   " - Added a configuration knob to enable/disable " +
                   "   flooding of unknonw unicast " +
                   " - Added several configuration knobs " +
                   "   to manage ARP and ND" +
                   "";
       reference   "";
     }

     revision "2016-06-23" {
       description "WG document adoption";
       reference   "";
     }

     revision "2015-10-15" {
       description "Initial revision";
       reference   "";
     }

     feature evpn-bgp-params {
       description "EVPN's BGP parameters";
     }

     feature evpn-pbb-params {
       description "EVPN's PBB parameters";
     }

     /* Identities */

     identity evpn-notification-state {
       description "The base identity on which EVPN notification " +
                   "states are based";
     }
     identity MAC-duplication-detected {
       base "evpn-notification-state";
       description "MAC duplication is detected";
     }

     identity mass-withdraw-received {
       base "evpn-notification-state";
       description "Mass withdraw received";
     }

     identity static-MAC-move-detected {
       base "evpn-notification-state";
       description "Static MAC move is detected";
     }

     /* Typedefs */

     typedef evpn-instance-ref {
       type leafref {
         path "/evpn/evpn-instances/evpn-instance/name";
       }
       description "A leafref type to an EVPN instance";
     }

     /* Groupings */

     grouping route-rd-rt-grp {
       description "A grouping for a route's route distinguishers " +
                   "and route targets";
       list rd-rt {
         key "route-distinguisher";
         leaf route-distinguisher {
           type rt-types:route-distinguisher;
           description "Route distinguisher";
         }
         list vpn-target {
           key "route-target";
           leaf route-target {
             type rt-types:route-target;
             description "BGP route target";
           }
           description "A list of route targets";
         }
         description "A list of route distinguishers and " +
                     "corresponding VPN route targets";
       }
     }
     grouping next-hop-label-grp {
       description "next-hop-label-grp";
       leaf next-hop {
         type inet:ip-address;
         description "next-hop";
       }
       leaf label {
         type rt-types:mpls-label;
         description "label";
       }
     }

     grouping next-hop-label2-grp {
       description "next-hop-label2-grp";
       leaf label2 {
         type rt-types:mpls-label;
         description "label2";
       }
     }

     grouping path-detail-grp {
       description "path-detail-grp";
       container detail {
         config false;
         description "path details";
         container attributes {
           leaf-list extended-community {
             type string;
             description "extended-community";
           }
           description "attributes";
         }
         leaf bestpath {
           type empty;
           description "Indicate this path is the best path";
         }
       }
     }

     /* EVPN YANG Model */

     container evpn {
       description "evpn";
       container common {
         description "common epn attributes";
         choice replication-type {
           description "A choice of replication type";
           case ingress-replication {
             leaf ingress-replication {
               type boolean;
               description "ingress-replication";
             }
           }
           case p2mp-replication {
             leaf p2mp-replication {
               type boolean;
               description "p2mp-replication";
             }
           }
         }
       }
       container evpn-instances {
         description "evpn-instances";
         list evpn-instance {
           key "name";
           description "An EVPN instance";
           leaf name {
             type string;
             description "Name of EVPN instance";
           }
           leaf evi {
             type uint32;
             description "evi";
           }
           container pbb-parameters {
             if-feature "evpn-pbb-params";
             description "PBB parameters";
             leaf source-bmac {
               type yang:hex-string;
               description "source-bmac";
             }
           }
           container bgp-parameters {
             description "BGP parameters";
             container common {
               description "BGP parameters common to all pseudowires";
               list rd-rt {
                 if-feature evpn-bgp-params;
                 key "route-distinguisher";
                 leaf route-distinguisher {
                   type rt-types:route-distinguisher;
                   description "Route distinguisher";
                 }
                 uses rt-types:vpn-route-targets;
                 description "A list of route distinguishers and " +
                             "corresponding VPN route targets";

               }
             }
           }
           leaf arp-proxy {
             type boolean;
             default false;
             description "Enable (TRUE) or disable (FALSE) ARP proxy";
           }
           leaf arp-suppression {
             type boolean;
             default false;
             description "Enable (TRUE) or disable (FALSE) " +
                         "ARP suppression";
           }
           leaf nd-proxy {
             type boolean;
             default false;
             description "Enable (TRUE) or disable (FALSE) ND proxy";
           }
           leaf nd-suppression {
             type boolean;
             default false;
             description "Enable (TRUE) or disable (FALSE) " +
                         "ND suppression";
           }
           leaf underlay-multicast {
             type boolean;
             default false;
             description "Enable (TRUE) or disable (FALSE) " +
                         "underlay multicast";
           }
           leaf flood-unknown-unicast-supression {
             type boolean;
             default false;
             description "Enable (TRUE) or disable (FALSE) " +
                         "flood unknown unicast suppression";
           }
           leaf vpws-vlan-aware {
             type boolean;
             default false;
             description "Enable (TRUE) or disable (FALSE) " +
                         "VPWS VLAN aware";
           }
           container routes {
             config false;
             description "routes";
             list ethernet-auto-discovery-route {
               uses route-rd-rt-grp;
               leaf ethernet-segment-identifier {
                 type uint32;
                 description "Ethernet segment identifier (esi)";
               }
               leaf ethernet-tag {
                 type uint32;
                 description "An ethernet tag (etag) indentifying a " +
                             "broadcast domain";
               }
               list path {
                 uses next-hop-label-grp;
                 uses path-detail-grp;
                 description "path";
               }
               description "ethernet-auto-discovery-route";
             }
             list mac-ip-advertisement-route {
               uses route-rd-rt-grp;
               leaf ethernet-segment-identifier {
                 type uint32;
                 description "Ethernet segment identifier (esi)";
               }
               leaf ethernet-tag {
                 type uint32;
                 description "An ethernet tag (etag) indentifying a " +
                             "broadcast domain";
               }
               leaf mac-address {
                 type yang:hex-string;
                 description "Route mac address";
               }
               leaf mac-address-length {
                 type uint8 {
                   range "0..48";
                 }
                 description "mac address length";
               }
               leaf ip-prefix {
                 type inet:ip-prefix;
                 description "ip-prefix";
               }
               list path {
                 uses next-hop-label-grp;
                 uses next-hop-label2-grp;
                 uses path-detail-grp;
                 description "path";
               }
               description "mac-ip-advertisement-route";

             }
             list inclusive-multicast-ethernet-tag-route {
               uses route-rd-rt-grp;
               leaf ethernet-segment-identifier {
                 type uint32;
                 description "Ethernet segment identifier (esi)";
               }
               leaf originator-ip-prefix {
                 type inet:ip-prefix;
                 description "originator-ip-prefix";
               }
               list path {
                 uses next-hop-label-grp;
                 uses path-detail-grp;
                 description "path";
               }
               description "inclusive-multicast-ethernet-tag-route";
             }
             list ethernet-segment-route {
               uses route-rd-rt-grp;
               leaf ethernet-segment-identifier {
                 type uint32;
                 description "Ethernet segment identifier (esi)";
               }
               leaf originator-ip-prefix {
                 type inet:ip-prefix;
                 description "originator ip-prefix";
               }
               list path {
                 leaf next-hop {
                   type inet:ip-address;
                   description "next-hop";
                 }
                 uses path-detail-grp;
                 description "path";
               }
               description "ethernet-segment-route";
             }
             list ip-prefix-route {
               uses route-rd-rt-grp;
               leaf ethernet-segment-identifier {
                 type uint32;
                 description "Ethernet segment identifier (esi)";
               }
               leaf ip-prefix {
                 type inet:ip-prefix;
                 description "ip-prefix";
               }
               list path {
                 uses next-hop-label-grp;
                 uses path-detail-grp;
                 description "path";
               }
               description "ip-prefix route";
             }
           }
           container statistics {
             config false;
             description "Statistics";
             leaf tx-count {
               type uint32;
               description "transmission count";
             }
             leaf rx-count {
               type uint32;
               description "receive count";
             }
             container detail {
               description "Detailed statistics";
               leaf broadcast-tx-count {
                 type uint32;
                 description "broadcast transmission count";
               }
               leaf broadcast-rx-count {
                 type uint32;
                 description "broadcast receive count";
               }
               leaf multicast-tx-count {
                 type uint32;
                 description "multicast transmission count";
               }
               leaf multicast-rx-count {
                 type uint32;
                 description "multicast receive count";
               }
               leaf unknown-unicast-tx-count {
                 type uint32;
                 description "unknown unicast transmission count";
               }
               leaf unknown-unicast-rx-count {
                 type uint32;
                 description "unknown-unicast receive count";
               }
             }
           }
         }

       }
     }

     /* augments */

     augment "/pw:pseudowires/pw:pseudowire/pw:pw-type" {
       description "Augment for an L2VPN instance to add EVPN VPWS " +
                   "pseudowire";
       case evpn-pw {
         container evpn-pw {
           description "EVPN pseudowire";
           leaf remote-id {
             type uint32;
             description "Remote pseudowire ID";
           }
           leaf local-id {
             type uint32;
             description "Local pseudowire ID";
           }
         }
       }
     }

     augment "/l2vpn:l2vpn/l2vpn:instances/l2vpn:instance" "/ni:network-instances/ni:network-instance/ni:ni-type" +
             "/l2vpn:l2vpn" {
       description "Augment for an L2VPN instance and EVPN association";
       leaf evpn-instance {
         type evpn-instance-ref;
         description "Reference to an EVPN instance";
       }
     }

     augment "/l2vpn:l2vpn/l2vpn:instances/l2vpn:instance" "/ni:network-instances/ni:network-instance/ni:ni-type" +
             "/l2vpn:l2vpn" {
       when "l2vpn:type = 'l2vpn:vpls-instance-type'" {
         description "Constraints only for VPLS pseudowires";
       }
       description "Augment for VPLS instance";
       container vpls-contstraints {
         must "not(boolean(/pw:pseudowires/pw:pseudowire" +
              "                [pw:name = current()/../l2vpn:endpoint" +
              "            /l2vpn:pw/l2vpn:name]" +
              "            /evpn-pw/remote-id)) and " +
              "not(boolean(/pw:pseudowires/pw:pseudowire" +
              "                [pw:name = current()/../l2vpn:endpoint" +
              "            /l2vpn:pw/l2vpn:name]" +
              "            /evpn-pw/local-id)) and " +
              "not(boolean(/pw:pseudowires/pw:pseudowire" +
              "                [pw:name = current()/../l2vpn:endpoint" +
              "            /l2vpn:primary-pw/l2vpn:name]" +
              "            /evpn-pw/remote-id)) and " +
              "not(boolean(/pw:pseudowires/pw:pseudowire" +
              "                [pw:name = current()/../l2vpn:endpoint" +
              "            /l2vpn:primary-pw/l2vpn:name]" +
              "            /evpn-pw/local-id)) and " +
              "not(boolean(/pw:pseudowires/pw:pseudowire" +
              "                [pw:name = current()/../l2vpn:endpoint" +
              "            /l2vpn:backup-pw/l2vpn:name]" +
              "            /evpn-pw/remote-id)) and " +
              "not(boolean(/pw:pseudowires/pw:pseudowire" +
              "                [pw:name = current()/../l2vpn:endpoint" +
              "            /l2vpn:backup-pw/l2vpn:name]" +
              "            /evpn-pw/local-id))" {
           description "A VPLS pseudowire must not be EVPN PW";
         }
         description "VPLS constraints";
       }
     }

     /* Notifications */

     notification evpn-state-change-notification {
       description "EVPN state change notification";
       leaf evpn-instance {
         type evpn-instance-ref;
         description "Related EVPN instance";
       }
       leaf state {
         type identityref {
           base evpn-notification-state;
         }
         description "State change notification";
       }
     }
   }
   <CODE ENDS>

5. 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]

6. IANA Considerations

      None.

7. References

7.1. Normative References Reference

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

7.2. Informative References

   [RFC6241]  R.Enns et al.,  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 2011,
              <http://www.rfc-editor.org/info/rfc6241>.

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

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

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

   [RFC7432]  Sajassi et al.,  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.
              2015, <http://www.rfc-editor.org/info/rfc7432>.

   [RFC7623]  Sajassi et al.,  Sajassi, A., Ed., Salam, S., Bitar, N., Isaac, A., and W.
              Henderickx, "Provider Backbone Bridging Combined with
              Ethernet VPN (PBB-EVPN)", RFC 7623, DOI 10.17487/RFC7623,
              September 2015 2015, <http://www.rfc-editor.org/info/rfc7623>.

Authors' Addresses

   Patrice Brissette
   Cisco Systems, Inc.
   EMail: pbrisset@cisco.com

   Ali Sajassi
   Cisco Systems, Inc.
   EMail: sajassi@cisco.com

   Himanshu Shah
   Ciena Corporation
   EMail: hshah@ciena.com

   Zhenbin Li
   Huawei Technologies
   EMail: lizhenbin@huawei.com

   Helen Chen
   Jabil
   EMail: Ing-Wher_Chen@jabil.com

   Kishore Tiruveedhula
   Juniper Networks
   EMail: kishoret@juniper.net

   Jorge Rabadan
   Nokia
   EMail: jorge.rabadan@nokia.com

   Ali Sajassi
   Cisco Systems, Inc.
   EMail: sajassi@cisco.com

   Zhenbin Li
   Huawei Technologies
   EMail: lizhenbin@huawei.com

   Iftekar Hussain
   Infinera Corporation
   EMail: ihussain@infinera.com

   Jorge Rabadan
   Nokia
   EMail: jorge.rabadan@nokia.com