module ietf-l3vpn-svc {

    yang-version 1.1;

    namespace
      "urn:ietf:params:xml:ns:yang:ietf-l3vpn-svc";

    prefix l3vpn-svc;

    import ietf-inet-types {
      prefix inet;
    }
    import ietf-yang-types {
      prefix yang;
    }
    import ietf-netconf-acm {
      prefix nacm;
    }

    organization "IETF L3SM Working Group";

    contact
      "WG List: <mailto:l3sm@ietf.org>
   Editor:
    L3SM WG
   Chairs:
    Adrian Farrel, Qin Wu
  ";

    description
      "This YANG module defines a generic service configuration
 model for Layer 3 VPNs. This model is common across all
 vendor implementations.

 Copyright (c) 2018 IETF Trust and the persons
 identified as authors of the code.  All rights reserved.

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

 This version of this YANG module is part of RFC 8299; see
 the RFC itself for full legal notices.";

    revision "2018-01-19" {
      description
        "Revision of RFC 8049 to fix implementation issues.";
      reference
        "RFC 8299";

    }

    revision "2017-01-27" {
      description "Initial document.";
      reference
        "RFC 8049.";

    }


    feature cloud-access {
      description
        "Allows the VPN to connect to a CSP.";
    }

    feature multicast {
      description
        "Enables multicast capabilities in a VPN.";
    }

    feature ipv4 {
      description
        "Enables IPv4 support in a VPN.";
    }

    feature ipv6 {
      description
        "Enables IPv6 support in a VPN.";
    }

    feature lan-tag {
      description
        "Enables LAN Tag support in a VPN Policy filter.";
    }

    feature carrierscarrier {
      description "Enables support of CsC.";
    }

    feature extranet-vpn {
      description
        "Enables support of extranet VPNs.";
    }

    feature site-diversity {
      description
        "Enables support of site diversity constraints.";
    }

    feature encryption {
      description
        "Enables support of encryption.";
    }

    feature qos {
      description
        "Enables support of classes of services.";
    }

    feature qos-custom {
      description
        "Enables support of the custom QoS profile.";
    }

    feature rtg-bgp {
      description
        "Enables support of the BGP routing protocol.";
    }

    feature rtg-rip {
      description
        "Enables support of the RIP routing protocol.";
    }

    feature rtg-ospf {
      description
        "Enables support of the OSPF routing protocol.";
    }

    feature rtg-ospf-sham-link {
      description
        "Enables support of OSPF sham links.";
    }

    feature rtg-vrrp {
      description
        "Enables support of the VRRP routing protocol.";
    }

    feature fast-reroute {
      description
        "Enables support of Fast Reroute.";
    }

    feature bfd {
      description "Enables support of BFD.";
    }

    feature always-on {
      description
        "Enables support of the 'always-on' access constraint.";
    }

    feature requested-type {
      description
        "Enables support of the 'requested-type' access constraint.";
    }

    feature bearer-reference {
      description
        "Enables support of the 'bearer-reference' access constraint.";
    }

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

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

    typedef template-id {
      type string;
      description
        "Defines a type of service template identifier.";
    }

    typedef address-family {
      type enumeration {
        enum "ipv4" {
          value 0;
          description "IPv4 address family.";
        }
        enum "ipv6" {
          value 1;
          description "IPv6 address family.";
        }
      }
      description
        "Defines a type for the address family.";
    }

    identity site-network-access-type {
      description
        "Base identity for site-network-access type.";
    }

    identity point-to-point {
      base site-network-access-type;
      description
        "Identity for point-to-point connection.";
    }

    identity multipoint {
      base site-network-access-type;
      description
        "Identity for multipoint connection.
  Example: Ethernet broadcast segment.";
    }

    identity placement-diversity {
      description
        "Base identity for site placement constraints.";
    }

    identity bearer-diverse {
      base placement-diversity;
      description
        "Identity for bearer diversity.
  The bearers should not use common elements.";
    }

    identity pe-diverse {
      base placement-diversity;
      description
        "Identity for PE diversity.";
    }

    identity pop-diverse {
      base placement-diversity;
      description
        "Identity for POP diversity.";
    }

    identity linecard-diverse {
      base placement-diversity;
      description
        "Identity for linecard diversity.";
    }

    identity same-pe {
      base placement-diversity;
      description
        "Identity for having sites connected on the same PE.";
    }

    identity same-bearer {
      base placement-diversity;
      description
        "Identity for having sites connected using the same bearer.";
    }

    identity customer-application {
      description
        "Base identity for customer application.";
    }

    identity web {
      base customer-application;
      description
        "Identity for Web application (e.g., HTTP, HTTPS).";
    }

    identity mail {
      base customer-application;
      description
        "Identity for mail application.";
    }

    identity file-transfer {
      base customer-application;
      description
        "Identity for file transfer application (e.g., FTP, SFTP).";
    }

    identity database {
      base customer-application;
      description
        "Identity for database application.";
    }

    identity social {
      base customer-application;
      description
        "Identity for social-network application.";
    }

    identity games {
      base customer-application;
      description
        "Identity for gaming application.";
    }

    identity p2p {
      base customer-application;
      description
        "Identity for peer-to-peer application.";
    }

    identity network-management {
      base customer-application;
      description
        "Identity for management application
  (e.g., Telnet, syslog, SNMP).";
    }

    identity voice {
      base customer-application;
      description
        "Identity for voice application.";
    }

    identity video {
      base customer-application;
      description
        "Identity for video conference application.";
    }

    identity embb {
      base customer-application;
      description
        "Identity for an enhanced Mobile Broadband (eMBB)
  application.  Note that an eMBB application demands
  network performance with a wide variety of
  characteristics, such as data rate, latency,
  loss rate, reliability, and many other parameters.";
    }

    identity urllc {
      base customer-application;
      description
        "Identity for an Ultra-Reliable and Low Latency
  Communications (URLLC) application.  Note that a
  URLLC application demands network performance
  with a wide variety of characteristics, such as latency,
  reliability, and many other parameters.";
    }

    identity mmtc {
      base customer-application;
      description
        "Identity for a massive Machine Type
   Communications (mMTC) application.  Note that an
   mMTC application demands network performance
   with a wide variety of characteristics, such as data
   rate, latency, loss rate, reliability, and many
   other parameters.";
    }

    identity site-vpn-flavor {
      description
        "Base identity for the site VPN service flavor.";
    }

    identity site-vpn-flavor-single {
      base site-vpn-flavor;
      description
        "Base identity for the site VPN service flavor.
  Used when the site belongs to only one VPN.";
    }

    identity site-vpn-flavor-multi {
      base site-vpn-flavor;
      description
        "Base identity for the site VPN service flavor.
  Used when a logical connection of a site
  belongs to multiple VPNs.";
    }

    identity site-vpn-flavor-sub {
      base site-vpn-flavor;
      description
        "Base identity for the site VPN service flavor.
  Used when a site has multiple logical connections.
  Each connection may belong to different multiple VPNs.";
    }

    identity site-vpn-flavor-nni {
      base site-vpn-flavor;
      description
        "Base identity for the site VPN service flavor.
  Used to describe an NNI option A connection.";
    }

    identity management {
      description
        "Base identity for site management scheme.";
    }

    identity co-managed {
      base management;
      description
        "Base identity for co-managed site.";
    }

    identity customer-managed {
      base management;
      description
        "Base identity for customer-managed site.";
    }

    identity provider-managed {
      base management;
      description
        "Base identity for provider-managed site.";
    }

    identity address-allocation-type {
      description
        "Base identity for address-allocation-type for PE-CE link.";
    }

    identity provider-dhcp {
      base address-allocation-type;
      description
        "Provider network provides DHCP service to customer.";
    }

    identity provider-dhcp-relay {
      base address-allocation-type;
      description
        "Provider network provides DHCP relay service to customer.";
    }

    identity provider-dhcp-slaac {
      base address-allocation-type;
      description
        "Provider network provides DHCP service to customer,
  as well as SLAAC.";
    }

    identity static-address {
      base address-allocation-type;
      description
        "Provider-to-customer addressing is static.";
    }

    identity slaac {
      base address-allocation-type;
      description "Use IPv6 SLAAC.";
    }

    identity site-role {
      description
        "Base identity for site type.";
    }

    identity any-to-any-role {
      base site-role;
      description
        "Site in an any-to-any IP VPN.";
    }

    identity spoke-role {
      base site-role;
      description
        "Spoke site in a Hub-and-Spoke IP VPN.";
    }

    identity hub-role {
      base site-role;
      description
        "Hub site in a Hub-and-Spoke IP VPN.";
    }

    identity vpn-topology {
      description
        "Base identity for VPN topology.";
    }

    identity any-to-any {
      base vpn-topology;
      description
        "Identity for any-to-any VPN topology.";
    }

    identity hub-spoke {
      base vpn-topology;
      description
        "Identity for Hub-and-Spoke VPN topology.";
    }

    identity hub-spoke-disjoint {
      base vpn-topology;
      description
        "Identity for Hub-and-Spoke VPN topology
  where Hubs cannot communicate with each other.";
    }

    identity multicast-tree-type {
      description
        "Base identity for multicast tree type.";
    }

    identity ssm-tree-type {
      base multicast-tree-type;
      description
        "Identity for SSM tree type.";
    }

    identity asm-tree-type {
      base multicast-tree-type;
      description
        "Identity for ASM tree type.";
    }

    identity bidir-tree-type {
      base multicast-tree-type;
      description
        "Identity for bidirectional tree type.";
    }

    identity multicast-rp-discovery-type {
      description
        "Base identity for RP discovery type.";
    }

    identity auto-rp {
      base multicast-rp-discovery-type;
      description
        "Base identity for Auto-RP discovery type.";
    }

    identity static-rp {
      base multicast-rp-discovery-type;
      description
        "Base identity for static type.";
    }

    identity bsr-rp {
      base multicast-rp-discovery-type;
      description
        "Base identity for BSR discovery type.";
    }

    identity routing-protocol-type {
      description
        "Base identity for routing protocol type.";
    }

    identity ospf {
      base routing-protocol-type;
      description
        "Identity for OSPF protocol type.";
    }

    identity bgp {
      base routing-protocol-type;
      description
        "Identity for BGP protocol type.";
    }

    identity static {
      base routing-protocol-type;
      description
        "Identity for static routing protocol type.";
    }

    identity rip {
      base routing-protocol-type;
      description
        "Identity for RIP protocol type.";
    }

    identity vrrp {
      base routing-protocol-type;
      description
        "Identity for VRRP protocol type.
  This is to be used when LANs are directly connected
  to PE routers.";
    }

    identity direct {
      base routing-protocol-type;
      description
        "Identity for direct protocol type.";
    }

    identity protocol-type {
      description
        "Base identity for protocol field type.";
    }

    identity tcp {
      base protocol-type;
      description "TCP protocol type.";
    }

    identity udp {
      base protocol-type;
      description "UDP protocol type.";
    }

    identity icmp {
      base protocol-type;
      description "ICMP protocol type.";
    }

    identity icmp6 {
      base protocol-type;
      description "ICMPv6 protocol type.";
    }

    identity gre {
      base protocol-type;
      description "GRE protocol type.";
    }

    identity ipip {
      base protocol-type;
      description "IP-in-IP protocol type.";
    }

    identity hop-by-hop {
      base protocol-type;
      description
        "Hop-by-Hop IPv6 header type.";
    }

    identity routing {
      base protocol-type;
      description
        "Routing IPv6 header type.";
    }

    identity esp {
      base protocol-type;
      description "ESP header type.";
    }

    identity ah {
      base protocol-type;
      description "AH header type.";
    }

    identity vpn-policy-filter-type {
      description
        "Base identity for VPN Policy filter type.";
    }

    identity ipv4 {
      base vpn-policy-filter-type;
      description
        "Identity for IPv4 Prefix filter type.";
    }

    identity ipv6 {
      base vpn-policy-filter-type;
      description
        "Identity for IPv6 Prefix filter type.";
    }

    identity lan {
      base vpn-policy-filter-type;
      description
        "Identity for LAN Tag filter type.";
    }

    identity qos-profile-direction {
      description
        "Base identity for QoS profile direction.";
    }

    identity site-to-wan {
      base qos-profile-direction;
      description
        "Identity for Site-to-WAN direction.";
    }

    identity wan-to-site {
      base qos-profile-direction;
      description
        "Identity for WAN-to-Site direction.";
    }

    identity both {
      base qos-profile-direction;
      description
        "Identity for both WAN-to-Site direction
   and Site-to-WAN direction.";
    }

    grouping vpn-service-cloud-access {
      description
        "Grouping for VPN cloud definition.";
      container cloud-accesses {
        if-feature cloud-access;
        description
          "Container for cloud access configurations.";
        list cloud-access {
          key "cloud-identifier";
          description
            "Cloud access configuration.";
          leaf cloud-identifier {
            type leafref {
              path
                "/l3vpn-svc/vpn-profiles/"
                  + "valid-provider-identifiers/cloud-identifier/id";
            }
            description
              "Identification of cloud service.
     Local administration meaning.";
          }

          choice list-flavor {
            description
              "Choice for cloud access policy.  By
     default, all sites in the IP VPN MUST
     be authorized to access the cloud.";
            leaf permit-any {
              type empty;
              description
                "Allows all sites.";
            }
            leaf-list permit-site {
              type leafref {
                path
                  "/l3vpn-svc/sites/site/site-id";
              }
              description
                "Site ID to be authorized.";
            }
            leaf-list deny-site {
              type leafref {
                path
                  "/l3vpn-svc/sites/site/site-id";
              }
              description
                "Site ID to be denied.";
            }
          }  // choice list-flavor

          container address-translation {
            description "Container for NAT.";
            container nat44 {
              description
                "IPv4-to-IPv4 translation.";
              leaf enabled {
                type boolean;
                default 'false';
                description
                  "Controls whether or not Network address
        translation from IPv4 to IPv4 (NAT44)
        [RFC3022] is required.";
              }

              leaf nat44-customer-address {
                type inet:ipv4-address;
                description
                  "Address to be used for network address
        translation from IPv4 to IPv4.  This is
        to be used if the customer is providing
        the IPv4 address.  If the customer address
        is not set, the model assumes that the
        provider will allocate the address.";
              }
            }  // container nat44
          }  // container address-translation
        }  // list cloud-access
      }  // container cloud-accesses
    }  // grouping vpn-service-cloud-access

    grouping multicast-rp-group-cfg {
      description
        "This grouping defines multicast group or
  multicast groups for RP-to-group mapping.";
      choice group-format {
        mandatory true;
        description
          "Choice for multicast group format.";
        leaf group-address {
          type inet:ip-address;
          description
            "A single multicast group address.";
        }

        case startend {
          leaf group-start {
            type inet:ip-address;
            description
              "The first multicast group address in
     the multicast group address range.";
          }

          leaf group-end {
            type inet:ip-address;
            description
              "The last multicast group address in
     the multicast group address range.";
          }
        }  // case startend
      }  // choice group-format
    }  // grouping multicast-rp-group-cfg

    grouping vpn-service-multicast {
      description
        "Grouping for multicast VPN definition.";
      container multicast {
        if-feature multicast;
        description
          "Multicast global parameters for the VPN service.";
        leaf enabled {
          type boolean;
          default 'false';
          description "Enables multicast.";
        }

        container customer-tree-flavors {
          description
            "Type of trees used by customer.";
          leaf-list tree-flavor {
            type identityref {
              base multicast-tree-type;
            }
            description
              "Type of tree to be used.";
          }
        }  // container customer-tree-flavors

        container rp {
          description "RP parameters.";
          container rp-group-mappings {
            description
              "RP-to-group mappings parameters.";
            list rp-group-mapping {
              key "id";
              description
                "List of RP-to-group mappings.";
              leaf id {
                type uint16;
                description
                  "Unique identifier for the mapping.";
              }

              container provider-managed {
                description
                  "Parameters for a provider-managed RP.";
                leaf enabled {
                  type boolean;
                  default 'false';
                  description
                    "Set to true if the Rendezvous Point (RP)
        must be a provider-managed node.  Set to false
        if it is a customer-managed node.";
                }

                leaf rp-redundancy {
                  type boolean;
                  default 'false';
                  description
                    "If true, a redundancy mechanism for the RP
        is required.";
                }

                leaf optimal-traffic-delivery {
                  type boolean;
                  default 'false';
                  description
                    "If true, the SP must ensure that
        traffic uses an optimal path.  An SP may use
        Anycast RP or RP-tree-to-SPT switchover
        architectures.";
                }
              }  // container provider-managed

              leaf rp-address {
                when
                  "../provider-managed/enabled = 'false'" {
                  description
                    "Relevant when the RP is not provider-managed.";
                }
                type inet:ip-address;
                mandatory true;
                description
                  "Defines the address of the RP.
       Used if the RP is customer-managed.";
              }

              container groups {
                description
                  "Multicast groups associated with the RP.";
                list group {
                  key "id";
                  description
                    "List of multicast groups.";
                  leaf id {
                    type uint16;
                    description
                      "Identifier for the group.";
                  }

                  uses multicast-rp-group-cfg;
                }  // list group
              }  // container groups
            }  // list rp-group-mapping
          }  // container rp-group-mappings

          container rp-discovery {
            description
              "RP discovery parameters.";
            leaf rp-discovery-type {
              type identityref {
                base multicast-rp-discovery-type;
              }
              default 'static-rp';
              description
                "Type of RP discovery used.";
            }

            container bsr-candidates {
              when
                "derived-from-or-self(../rp-discovery-type, "
                  + "'l3vpn-svc:bsr-rp')" {
                description
                  "Only applicable if discovery type
       is BSR-RP.";
              }
              description
                "Container for List of Customer
      BSR candidate's addresses.";
              leaf-list bsr-candidate-address {
                type inet:ip-address;
                description
                  "Address of BSR candidate.";
              }
            }  // container bsr-candidates
          }  // container rp-discovery
        }  // container rp
      }  // container multicast
    }  // grouping vpn-service-multicast

    grouping vpn-service-mpls {
      description
        "Grouping for MPLS CsC definition.";
      leaf carrierscarrier {
        if-feature carrierscarrier;
        type boolean;
        default 'false';
        description
          "The VPN is using CsC, and so MPLS is required.";
      }
    }  // grouping vpn-service-mpls

    grouping customer-location-info {
      description
        "This grouping defines customer location parameters.";
      container locations {
        description
          "List of locations for the site.";
        list location {
          key "location-id";
          description
            "Location of the site.";
          leaf location-id {
            type svc-id;
            description
              "Identifier for a particular location.";
          }

          leaf address {
            type string;
            description
              "Address (number and street) of the site.";
          }

          leaf postal-code {
            type string;
            description
              "Postal code of the site.";
          }

          leaf state {
            type string;
            description
              "State of the site.  This leaf can also be
     used to describe a region for a country that
     does not have states.";
          }

          leaf city {
            type string;
            description "City of the site.";
          }

          leaf country-code {
            type string {
              pattern '[A-Z]{2}';
            }
            description
              "Country of the site.
     Expressed as ISO ALPHA-2 code.";
          }
        }  // list location
      }  // container locations
    }  // grouping customer-location-info

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

    grouping site-diversity {
      description
        "This grouping defines site
  diversity parameters.";
      container site-diversity {
        if-feature site-diversity;
        description
          "Diversity constraint type.  All
   site-network-accesses will inherit
   the group values defined here.";
        uses site-group;
      }  // container site-diversity
    }  // grouping site-diversity

    grouping access-diversity {
      description
        "This grouping defines access diversity parameters.";
      container access-diversity {
        if-feature site-diversity;
        description "Diversity parameters.";
        uses site-group;

        container constraints {
          description
            "Placement constraints for this site network access.";
          list constraint {
            key "constraint-type";
            description
              "List of constraints.";
            leaf constraint-type {
              type identityref {
                base placement-diversity;
              }
              description
                "Diversity constraint type.";
            }

            container target {
              description
                "The constraint will be applied against a
      Specific target, and the target can be a list
      of group-ids,all other site network accesses of
      this site, or all other groups managed by the
      customer.";
              choice target-flavor {
                default 'id';
                description
                  "Choice for the target flavor definition.";
                list group {
                  key "group-id";
                  description
                    "List of group-ids associated with one specific
         constraint for this site network access level.";
                  leaf group-id {
                    type string;
                    description
                      "The constraint will be applied against
          this particular group-id for this site
          network access level.";
                  }
                }  // list group
                leaf all-other-accesses {
                  type empty;
                  description
                    "The constraint will be applied against
         all other site network accesses of this site.";
                }
                leaf all-other-groups {
                  type empty;
                  description
                    "The constraint will be applied against
         all other groups managed by the customer.";
                }
              }  // choice target-flavor
            }  // container target
          }  // list constraint
        }  // container constraints
      }  // container access-diversity
    }  // grouping access-diversity

    grouping operational-requirements {
      description
        "This grouping defines some operational
  parameters.";
      leaf requested-site-start {
        type yang:date-and-time;
        description
          "Optional leaf indicating requested date and
     time when the service at a particular site is
     expected to start.";
      }

      leaf requested-site-stop {
        type yang:date-and-time;
        description
          "Optional leaf indicating requested date and
     time when the service at a particular site is
     expected to stop.";
      }
    }  // grouping operational-requirements

    grouping operational-requirements-ops {
      description
        "This grouping defines some operational
  parameters.";
      leaf actual-site-start {
        type yang:date-and-time;
        config false;
        description
          "Optional leaf indicating actual date and
     time when the service at a particular site
     actually started.";
      }

      leaf actual-site-stop {
        type yang:date-and-time;
        config false;
        description
          "Optional leaf indicating actual date and
     time when the service at a particular site
     actually stopped.";
      }
    }  // grouping operational-requirements-ops

    grouping flow-definition {
      description
        "Flow definition based on criteria.";
      container match-flow {
        description
          "Describes flow-matching criteria.";
        leaf dscp {
          type inet:dscp;
          description "DSCP value.";
        }

        leaf dot1p {
          type uint8 {
            range "0..7";
          }
          description "802.1p matching.";
        }

        leaf ipv4-src-prefix {
          type inet:ipv4-prefix;
          description
            "Match on IPv4 src address.";
        }

        leaf ipv6-src-prefix {
          type inet:ipv6-prefix;
          description
            "Match on IPv6 src address.";
        }

        leaf ipv4-dst-prefix {
          type inet:ipv4-prefix;
          description
            "Match on IPv4 dst address.";
        }

        leaf ipv6-dst-prefix {
          type inet:ipv6-prefix;
          description
            "Match on IPv6 dst address.";
        }

        leaf l4-src-port {
          type inet:port-number;
          must
            "current() < ../l4-src-port-range/lower-port or "
              + "current() > ../l4-src-port-range/upper-port" {
            description
              "If l4-src-port and l4-src-port-range/lower-port and
     upper-port are set at the same time, l4-src-port
     should not overlap with l4-src-port-range.";
          }
          description
            "Match on Layer 4 src port.";
        }

        leaf-list target-sites {
          if-feature target-sites;
          type svc-id;
          description
            "Identify a site as traffic destination.";
        }

        container l4-src-port-range {
          description
            "Match on Layer 4 src port range.  When
     only the lower-port is present, it represents
     a single port.  When both the lower-port and
     upper-port are specified, it implies
     a range inclusive of both values.";
          leaf lower-port {
            type inet:port-number;
            description
              "Lower boundary for port.";
          }

          leaf upper-port {
            type inet:port-number;
            must ". >= ../lower-port" {
              description
                "Upper boundary for port.  If it
      exists, the upper boundary must be
      higher than the lower boundary.";
            }
            description
              "Upper boundary for port.";
          }
        }  // container l4-src-port-range

        leaf l4-dst-port {
          type inet:port-number;
          must
            "current() < ../l4-dst-port-range/lower-port or "
              + "current() > ../l4-dst-port-range/upper-port" {
            description
              "If l4-dst-port and l4-dst-port-range/lower-port
     and upper-port are set at the same time,
     l4-dst-port should not overlap with
     l4-src-port-range.";
          }
          description
            "Match on Layer 4 dst port.";
        }

        container l4-dst-port-range {
          description
            "Match on Layer 4 dst port range.  When only
    lower-port is present, it represents a single
    port.  When both lower-port and upper-port are
    specified, it implies a range inclusive of both
    values.";
          leaf lower-port {
            type inet:port-number;
            description
              "Lower boundary for port.";
          }

          leaf upper-port {
            type inet:port-number;
            must ". >= ../lower-port" {
              description
                "Upper boundary must be
     higher than lower boundary.";
            }
            description
              "Upper boundary for port.  If it exists,
     upper boundary must be higher than lower
     boundary.";
          }
        }  // container l4-dst-port-range

        leaf protocol-field {
          type union {
            type uint8;
            type identityref {
              base protocol-type;
            }
          }
          description
            "Match on IPv4 protocol or IPv6 Next Header field.";
        }
      }  // container match-flow
    }  // grouping flow-definition

    grouping site-service-basic {
      description
        "Defines basic service parameters for a site.";
      leaf svc-input-bandwidth {
        type uint64;
        units "bps";
        mandatory true;
        description
          "From the customer site's perspective, the service
     input bandwidth of the connection or download
     bandwidth from the SP to the site.";
      }

      leaf svc-output-bandwidth {
        type uint64;
        units "bps";
        mandatory true;
        description
          "From the customer site's perspective, the service
     output bandwidth of the connection or upload
     bandwidth from the site to the SP.";
      }

      leaf svc-mtu {
        type uint16;
        units "bytes";
        mandatory true;
        description
          "MTU at service level.  If the service is IP,
    it refers to the IP MTU.  If CsC is enabled,
    the requested 'svc-mtu' leaf will refer to the
    MPLS MTU and not to the IP MTU.";
      }
    }  // grouping site-service-basic

    grouping site-protection {
      description
        "Defines protection service parameters for a site.";
      container traffic-protection {
        if-feature fast-reroute;
        description
          "Fast Reroute service parameters for the site.";
        leaf enabled {
          type boolean;
          default 'false';
          description
            "Enables traffic protection of access link.";
        }
      }  // container traffic-protection
    }  // grouping site-protection

    grouping site-service-mpls {
      description
        "Defines MPLS service parameters for a site.";
      container carrierscarrier {
        if-feature carrierscarrier;
        description
          "This container is used when the customer provides
     MPLS-based services.  This is only used in the case
     of CsC (i.e., a customer builds an MPLS service using
     an IP VPN to carry its traffic).";
        leaf signalling-type {
          type enumeration {
            enum "ldp" {
              value 0;
              description
                "Use LDP as the signalling protocol
     between the PE and the CE.  In this case,
     an IGP routing protocol must also be activated.";
            }
            enum "bgp" {
              value 1;
              description
                "Use BGP (as per RFC 8277) as the signalling protocol
     between the PE and the CE.
     In this case, BGP must also be configured as
     the routing protocol.";
            }
          }
          default 'bgp';
          description
            "MPLS signalling type.";
        }
      }  // container carrierscarrier
    }  // grouping site-service-mpls

    grouping site-service-qos-profile {
      description
        "This grouping defines QoS parameters for a site.";
      container qos {
        if-feature qos;
        description "QoS configuration.";
        container qos-classification-policy {
          description
            "Configuration of the traffic classification policy.";
          list rule {
            key "id";
            ordered-by user;
            description
              "List of marking rules.";
            leaf id {
              type string;
              description
                "A description identifying the
       qos-classification-policy rule.";
            }

            choice match-type {
              default 'match-flow';
              description
                "Choice for classification.";
              case match-flow {
                uses flow-definition;
              }  // case match-flow
              leaf match-application {
                type identityref {
                  base customer-application;
                }
                description
                  "Defines the application to match.";
              }
            }  // choice match-type

            leaf target-class-id {
              type string;
              description
                "Identification of the class of service.
      This identifier is internal to the administration.";
            }
          }  // list rule
        }  // container qos-classification-policy

        container qos-profile {
          description
            "QoS profile configuration.";
          choice qos-profile {
            description
              "Choice for QoS profile.
     Can be standard profile or customized profile.";
            case standard {
              description
                "Standard QoS profile.";
              leaf profile {
                type leafref {
                  path
                    "/l3vpn-svc/vpn-profiles/valid-provider-identifiers"
                      + "/qos-profile-identifier/id";
                }
                description
                  "QoS profile to be used.";
              }
            }  // case standard

            case custom {
              description
                "Customized QoS profile.";
              container classes {
                if-feature qos-custom;
                description
                  "Container for list of classes of services.";
                list class {
                  key "class-id";
                  description
                    "List of classes of services.";
                  leaf class-id {
                    type string;
                    description
                      "Identification of the class of service.
                  This identifier is internal to the
                  administration.";
                  }

                  leaf direction {
                    type identityref {
                      base qos-profile-direction;
                    }
                    default 'both';
                    description
                      "The direction to which the QoS profile
                   is applied.";
                  }

                  leaf rate-limit {
                    type decimal64 {
                      fraction-digits 5;
                      range "0..100";
                    }
                    units "percent";
                    description
                      "To be used if the class must be rate-limited.
                   Expressed as percentage of the service
                   bandwidth.";
                  }

                  container latency {
                    description
                      "Latency constraint on the traffic class.";
                    choice flavor {
                      description
                        "Latency constraint on the traffic class.";
                      leaf use-lowest-latency {
                        type empty;
                        description
                          "The traffic class should use the path with the
             lowest latency.";
                      }
                      leaf latency-boundary {
                        type uint16;
                        units "msec";
                        default '400';
                        description
                          "The traffic class should use a path with a
             defined maximum latency.";
                      }
                    }  // choice flavor
                  }  // container latency

                  container jitter {
                    description
                      "Jitter constraint on the traffic class.";
                    choice flavor {
                      description
                        "Jitter constraint on the traffic class.";
                      leaf use-lowest-jitter {
                        type empty;
                        description
                          "The traffic class should use the path with the
             lowest jitter.";
                      }
                      leaf latency-boundary {
                        type uint32;
                        units "usec";
                        default '40000';
                        description
                          "The traffic class should use a path with a
             defined maximum jitter.";
                      }
                    }  // choice flavor
                  }  // container jitter

                  container bandwidth {
                    description
                      "Bandwidth constraint on the traffic class.";
                    leaf guaranteed-bw-percent {
                      type decimal64 {
                        fraction-digits 5;
                        range "0..100";
                      }
                      units "percent";
                      mandatory true;
                      description
                        "To be used to define the guaranteed bandwidth
           as a percentage of the available service bandwidth.";
                    }

                    leaf end-to-end {
                      type empty;
                      description
                        "Used if the bandwidth reservation
           must be done on the MPLS network too.";
                    }
                  }  // container bandwidth
                }  // list class
              }  // container classes
            }  // case custom
          }  // choice qos-profile
        }  // container qos-profile
      }  // container qos
    }  // grouping site-service-qos-profile

    grouping site-security-authentication {
      description
        "This grouping defines authentication parameters for a site.";
      container authentication {
        description
          "Authentication parameters.";
      }  // container authentication
    }  // grouping site-security-authentication

    grouping site-security-encryption {
      description
        "This grouping defines encryption parameters for a site.";
      container encryption {
        if-feature encryption;
        description "Encryption parameters.";
        leaf enabled {
          type boolean;
          default 'false';
          description
            "If true, traffic encryption on the connection is required.";
        }

        leaf layer {
          when "../enabled = 'true'" {
            description
              "Require a value for layer when enabled is true.";
          }
          type enumeration {
            enum "layer2" {
              value 0;
              description
                "Encryption will occur at Layer 2.";
            }
            enum "layer3" {
              value 1;
              description
                "Encryption will occur at Layer 3.
      For example, IPsec may be used when
      a customer requests Layer 3 encryption.";
            }
          }
          description
            "Layer on which encryption is applied.";
        }

        container encryption-profile {
          description
            "Profile of encryption to be applied.";
          choice profile {
            description
              "Choice of encryption profile.  The encryption
     profile can be the provider profile or customer profile.";
            leaf profile-name {
              type leafref {
                path
                  "/l3vpn-svc/vpn-profiles/valid-provider-identifiers"
                    + "/encryption-profile-identifier/id";
              }
              description
                "Name of the SP profile to be applied.";
            }

            case customer-profile {
              leaf algorithm {
                type string;
                description
                  "Encryption algorithm to be used.";
              }

              choice key-type {
                default 'psk';
                description
                  "Type of keys to be used.";
                leaf preshared-key {
                  type string;
                  description
                    "Pre-Shared Key (PSK) coming from the customer.";
                }
              }  // choice key-type
            }  // case customer-profile
          }  // choice profile
        }  // container encryption-profile
      }  // container encryption
    }  // grouping site-security-encryption

    grouping site-attachment-bearer {
      description
        "Defines physical properties of a site attachment.";
      container bearer {
        description
          "Bearer-specific parameters.
     To be augmented.";
        container requested-type {
          if-feature requested-type;
          description
            "Container for requested-type.";
          leaf requested-type {
            type string;
            description
              "Type of requested bearer: Ethernet, DSL,
     Wireless, etc. Operator specific.";
          }

          leaf strict {
            type boolean;
            default 'false';
            description
              "Defines whether requested-type is a preference
     or a strict requirement.";
          }
        }  // container requested-type

        leaf always-on {
          if-feature always-on;
          type boolean;
          default 'true';
          description
            "Request for an always-on access type.
     For example, this could mean no dial access type.";
        }

        leaf bearer-reference {
          if-feature bearer-reference;
          type string;
          description
            "This is an internal reference for the SP.";
        }
      }  // container bearer
    }  // grouping site-attachment-bearer

    grouping site-routing {
      description
        "Grouping for routing protocols.";
      container routing-protocols {
        description
          "Defines routing protocols.";
        list routing-protocol {
          key "type";
          description
            "List of routing protocols used on
    the site.  This list can be augmented.";
          leaf type {
            type identityref {
              base routing-protocol-type;
            }
            description
              "Type of routing protocol.";
          }

          container ospf {
            when
              "derived-from-or-self(../type, 'l3vpn-svc:ospf')" {
              description
                "Only applies when protocol is OSPF.";
            }
            if-feature rtg-ospf;
            description
              "OSPF-specific configuration.";
            leaf-list address-family {
              type address-family;
              min-elements 1;
              description
                "If OSPF is used on this site, this node
         contains a configured value.  This node
         contains at least one address family
         to be activated.";
            }

            leaf area-address {
              type yang:dotted-quad;
              mandatory true;
              description "Area address.";
            }

            leaf metric {
              type uint16;
              default '1';
              description
                "Metric of the PE-CE link.  It is used
         in the routing state calculation and
         path selection.";
            }

            container sham-links {
              if-feature rtg-ospf-sham-link;
              description
                "List of sham links.";
              list sham-link {
                key "target-site";
                description
                  "Creates a sham link with another site.";
                leaf target-site {
                  type svc-id;
                  description
                    "Target site for the sham link connection.
         The site is referred to by its ID.";
                }

                leaf metric {
                  type uint16;
                  default '1';
                  description
                    "Metric of the sham link.  It is used in
         the routing state calculation and path
         selection.  The default value is set
         to 1.";
                }
              }  // list sham-link
            }  // container sham-links
          }  // container ospf

          container bgp {
            when
              "derived-from-or-self(../type, 'l3vpn-svc:bgp')" {
              description
                "Only applies when protocol is BGP.";
            }
            if-feature rtg-bgp;
            description
              "BGP-specific configuration.";
            leaf autonomous-system {
              type uint32;
              mandatory true;
              description
                "Customer AS number in case the customer
         requests BGP routing.";
            }

            leaf-list address-family {
              type address-family;
              min-elements 1;
              description
                "If BGP is used on this site, this node
         contains a configured value.  This node
         contains at least one address family
         to be activated.";
            }
          }  // container bgp

          container static {
            when
              "derived-from-or-self(../type, 'l3vpn-svc:static')" {
              description
                "Only applies when protocol is static.
       BGP activation requires the SP to know
       the address of the customer peer.  When
       BGP is enabled, the 'static-address'
       allocation type for the IP connection
       MUST be used.";
            }
            description
              "Configuration specific to static routing.";
            container cascaded-lan-prefixes {
              description
                "LAN prefixes from the customer.";
              list ipv4-lan-prefixes {
                if-feature ipv4;
                key "lan next-hop";
                description
                  "List of LAN prefixes for the site.";
                leaf lan {
                  type inet:ipv4-prefix;
                  description
                    "LAN prefixes.";
                }

                leaf lan-tag {
                  type string;
                  description
                    "Internal tag to be used in VPN policies.";
                }

                leaf next-hop {
                  type inet:ipv4-address;
                  description
                    "Next-hop address to use on the customer side.";
                }
              }  // list ipv4-lan-prefixes

              list ipv6-lan-prefixes {
                if-feature ipv6;
                key "lan next-hop";
                description
                  "List of LAN prefixes for the site.";
                leaf lan {
                  type inet:ipv6-prefix;
                  description
                    "LAN prefixes.";
                }

                leaf lan-tag {
                  type string;
                  description
                    "Internal tag to be used in VPN policies.";
                }

                leaf next-hop {
                  type inet:ipv6-address;
                  description
                    "Next-hop address to use on the customer side.";
                }
              }  // list ipv6-lan-prefixes
            }  // container cascaded-lan-prefixes
          }  // container static

          container rip {
            when
              "derived-from-or-self(../type, 'l3vpn-svc:rip')" {
              description
                "Only applies when the protocol is RIP.  For IPv4,
      the model assumes that RIP version 2 is used.";
            }
            if-feature rtg-rip;
            description
              "Configuration specific to RIP routing.";
            leaf-list address-family {
              type address-family;
              min-elements 1;
              description
                "If RIP is used on this site, this node
         contains a configured value.  This node
         contains at least one address family
         to be activated.";
            }
          }  // container rip

          container vrrp {
            when
              "derived-from-or-self(../type, 'l3vpn-svc:vrrp')" {
              description
                "Only applies when protocol is VRRP.";
            }
            if-feature rtg-vrrp;
            description
              "Configuration specific to VRRP routing.";
            leaf-list address-family {
              type address-family;
              min-elements 1;
              description
                "If VRRP is used on this site, this node
         contains a configured value.  This node contains
         at least one address family to be activated.";
            }
          }  // container vrrp
        }  // list routing-protocol
      }  // container routing-protocols
    }  // grouping site-routing

    grouping site-attachment-ip-connection {
      description
        "This grouping defines IP connection parameters.";
      container ip-connection {
        description
          "Defines connection parameters.";
        container ipv4 {
          if-feature ipv4;
          description
            "IPv4-specific parameters.";
          leaf address-allocation-type {
            type identityref {
              base address-allocation-type;
            }
            must
              "not(derived-from-or-self(current(), 'l3vpn-svc:slaac') or "
                + "derived-from-or-self(current(), "
                + "'l3vpn-svc:provider-dhcp-slaac'))" {
              error-message
                "SLAAC is only applicable to IPv6";
            }
            description
              "Defines how addresses are allocated.
     If there is no value for the address
     allocation type, then IPv4 is not enabled.";
          }

          container provider-dhcp {
            when
              "derived-from-or-self(../address-allocation-type, "
                + "'l3vpn-svc:provider-dhcp')" {
              description
                "Only applies when addresses are allocated by DHCP.";
            }
            description
              "DHCP allocated addresses related parameters.";
            leaf provider-address {
              type inet:ipv4-address;
              description
                "Address of provider side.  If provider-address is not
         specified, then prefix length should not be specified
         either.  It also implies provider-dhcp allocation is
         not enabled.  If provider-address is specified, then
         the prefix length may or may not be specified.";
            }

            leaf prefix-length {
              type uint8 {
                range "0..32";
              }
              must "(../provider-address)" {
                error-message
                  "If the prefix length is specified, provider-address
          must also be specified.";
                description
                  "If the prefix length is specified, provider-address
             must also be specified.";
              }
              description
                "Subnet prefix length expressed in bits.
     If not specified, or specified as zero,
     this means the customer leaves the actual
     prefix length value to the provider.";
            }

            choice address-assign {
              default 'number';
              description
                "Choice for the way to assign addresses.";
              leaf number-of-dynamic-address {
                type uint16;
                default '1';
                description
                  "Describes the number of IP addresses
         the customer requires.";
              }
              container customer-addresses {
                description
                  "Container for customer addresses is allocated by DHCP.";
                list address-group {
                  key "group-id";
                  description
                    "Describes IP addresses allocated by DHCP.
         When only start-address or only end-address
         is present, it represents a single address.
         When both start-address and end-address are
         specified, it implies a range inclusive of both
         addresses.  If no address is specified, it implies
         customer addresses group is not supported.";
                  leaf group-id {
                    type string;
                    description
                      "Group-id for the address range from
         start-address to end-address.";
                  }

                  leaf start-address {
                    type inet:ipv4-address;
                    description
                      "First address.";
                  }

                  leaf end-address {
                    type inet:ipv4-address;
                    description
                      "Last address.";
                  }
                }  // list address-group
              }  // container customer-addresses
            }  // choice address-assign
          }  // container provider-dhcp

          container dhcp-relay {
            when
              "derived-from-or-self(../address-allocation-type, "
                + "'l3vpn-svc:provider-dhcp-relay')" {
              description
                "Only applies when provider is required to implement
     DHCP relay function.";
            }
            description
              "DHCP relay provided by operator.";
            leaf provider-address {
              type inet:ipv4-address;
              description
                "Address of provider side.  If provider-address is not
     specified, then prefix length should not be specified
     either.  It also implies provider-dhcp allocation is
     not enabled.  If provider-address is specified, then
     prefix length may or may not be specified.";
            }

            leaf prefix-length {
              type uint8 {
                range "0..32";
              }
              must "(../provider-address)" {
                error-message
                  "If prefix length is specified, provider-address
      must also be specified.";
                description
                  "If prefix length is specified, provider-address
     must also be specified.";
              }
              description
                "Subnet prefix length expressed in bits.  If not
     specified, or specified as zero, this means the
     customer leaves the actual prefix length value
     to the provider.";
            }

            container customer-dhcp-servers {
              description
                "Container for list of customer DHCP servers.";
              leaf-list server-ip-address {
                type inet:ipv4-address;
                description
                  "IP address of customer DHCP server.";
              }
            }  // container customer-dhcp-servers
          }  // container dhcp-relay

          container addresses {
            when
              "derived-from-or-self(../address-allocation-type, "
                + "'l3vpn-svc:static-address')" {
              description
                "Only applies when protocol allocation type is static.";
            }
            description
              "Describes IPv4 addresses used.";
            leaf provider-address {
              type inet:ipv4-address;
              description
                "IPv4 Address List of the provider side.
         When the protocol allocation type is static,
         the provider address must be configured.";
            }

            leaf customer-address {
              type inet:ipv4-address;
              description
                "IPv4 Address of customer side.";
            }

            leaf prefix-length {
              type uint8 {
                range "0..32";
              }
              description
                "Subnet prefix length expressed in bits.
     It is applied to both provider-address
     and customer-address.";
            }
          }  // container addresses
        }  // container ipv4

        container ipv6 {
          if-feature ipv6;
          description
            "IPv6-specific parameters.";
          leaf address-allocation-type {
            type identityref {
              base address-allocation-type;
            }
            description
              "Defines how addresses are allocated.
     If there is no value for the address
     allocation type, then IPv6 is
     not enabled.";
          }

          container provider-dhcp {
            when
              "derived-from-or-self(../address-allocation-type, "
                + "'l3vpn-svc:provider-dhcp') "
                + "or derived-from-or-self(../address-allocation-type, "
                + "'l3vpn-svc:provider-dhcp-slaac')" {
              description
                "Only applies when addresses are allocated by DHCP.";
            }
            description
              "DHCP allocated addresses related parameters.";
            leaf provider-address {
              type inet:ipv6-address;
              description
                "Address of the provider side.  If provider-address
           is not specified, then prefix length should not be
           specified either.  It also implies provider-dhcp
           allocation is not enabled.  If provider-address is
           specified, then prefix length may or may
           not be specified.";
            }

            leaf prefix-length {
              type uint8 {
                range "0..128";
              }
              must "(../provider-address)" {
                error-message
                  "If prefix length is specified, provider-address
             must also be specified.";
                description
                  "If prefix length is specified, provider-address
             must also be specified.";
              }
              description
                "Subnet prefix length expressed in bits.  If not
       specified, or specified as zero, this means the
       customer leaves the actual prefix length value
       to the provider.";
            }

            choice address-assign {
              default 'number';
              description
                "Choice for the way to assign addresses.";
              leaf number-of-dynamic-address {
                type uint16;
                default '1';
                description
                  "Describes the number of IP addresses the customer
           requires.";
              }
              container customer-addresses {
                description
                  "Container for customer addresses allocated by DHCP.";
                list address-group {
                  key "group-id";
                  description
                    "Describes IP addresses allocated by DHCP.  When only
                 start-address or only end-address is present, it
                 represents a single address.  When both start-address
                 and end-address are specified, it implies a range
                 inclusive of both addresses.  If no address is
                 specified, it implies customer addresses group is
                 not supported.";
                  leaf group-id {
                    type string;
                    description
                      "Group-id for the address range from
                 start-address to end-address.";
                  }

                  leaf start-address {
                    type inet:ipv6-address;
                    description
                      "First address.";
                  }

                  leaf end-address {
                    type inet:ipv6-address;
                    description
                      "Last address.";
                  }
                }  // list address-group
              }  // container customer-addresses
            }  // choice address-assign
          }  // container provider-dhcp

          container dhcp-relay {
            when
              "derived-from-or-self(../address-allocation-type, "
                + "'l3vpn-svc:provider-dhcp-relay')" {
              description
                "Only applies when the provider is required
      to implement DHCP relay function.";
            }
            description
              "DHCP relay provided by operator.";
            leaf provider-address {
              type inet:ipv6-address;
              description
                "Address of the provider side.  If provider-address is
          not specified, then prefix length should not be
          specified either.  It also implies provider-dhcp
          allocation is not enabled.  If provider address
          is specified, then prefix length may or may
          not be specified.";
            }

            leaf prefix-length {
              type uint8 {
                range "0..128";
              }
              must "(../provider-address)" {
                error-message
                  "If prefix length is specified, provider-address
           must also be specified.";
                description
                  "If prefix length is specified, provider-address
          must also be specified.";
              }
              description
                "Subnet prefix length expressed in bits.  If not
         specified, or specified as zero, this means the
         customer leaves the actual prefix length value
         to the provider.";
            }

            container customer-dhcp-servers {
              description
                "Container for list of customer DHCP servers.";
              leaf-list server-ip-address {
                type inet:ipv6-address;
                description
                  "This node contains the IP address of
       the customer DHCP server.  If the DHCP relay
       function is implemented by the
       provider, this node contains the
       configured value.";
              }
            }  // container customer-dhcp-servers
          }  // container dhcp-relay

          container addresses {
            when
              "derived-from-or-self(../address-allocation-type, "
                + "'l3vpn-svc:static-address')" {
              description
                "Only applies when protocol allocation type is static.";
            }
            description
              "Describes IPv6 addresses used.";
            leaf provider-address {
              type inet:ipv6-address;
              description
                "IPv6 Address of the provider side.  When the protocol
      allocation type is static, the provider address
      must be configured.";
            }

            leaf customer-address {
              type inet:ipv6-address;
              description
                "The IPv6 Address of the customer side.";
            }

            leaf prefix-length {
              type uint8 {
                range "0..128";
              }
              description
                "Subnet prefix length expressed in bits.
     It is applied to both provider-address and
     customer-address.";
            }
          }  // container addresses
        }  // container ipv6

        container oam {
          description
            "Defines the Operations, Administration, and Maintenance (OAM)
    mechanisms used on the connection.  BFD is set as a fault
    detection mechanism, but the 'oam' container can easily
    be augmented by other mechanisms";
          container bfd {
            if-feature bfd;
            description "Container for BFD.";
            leaf enabled {
              type boolean;
              default 'false';
              description
                "If true, BFD activation is required.";
            }

            choice holdtime {
              default 'fixed';
              description
                "Choice for holdtime flavor.";
              leaf fixed-value {
                type uint32;
                units "msec";
                description
                  "Expected BFD holdtime expressed in msec.  The customer
         may impose some fixed values for the holdtime period
         if the provider allows the customer use this function.
         If the provider doesn't allow the customer to use this
         function, the fixed-value will not be set.";
              }

              case profile {
                description
                  "Well-known SP profile.";
                leaf profile-name {
                  type leafref {
                    path
                      "/l3vpn-svc/vpn-profiles/valid-provider-identifiers/"
                        + "bfd-profile-identifier/id";
                  }
                  description
                    "Well-known SP profile name.  The provider can propose
        some profiles to the customer, depending on the service
        level the customer wants to achieve.  Profile names
        must be communicated to the customer.";
                }
              }  // case profile
            }  // choice holdtime
          }  // container bfd
        }  // container oam
      }  // container ip-connection
    }  // grouping site-attachment-ip-connection

    grouping site-service-multicast {
      description
        "Multicast parameters for the site.";
      container multicast {
        if-feature multicast;
        description
          "Multicast parameters for the site.";
        leaf multicast-site-type {
          type enumeration {
            enum "receiver-only" {
              value 0;
              description
                "The site only has receivers.";
            }
            enum "source-only" {
              value 1;
              description
                "The site only has sources.";
            }
            enum "source-receiver" {
              value 2;
              description
                "The site has both sources and receivers.";
            }
          }
          default 'source-receiver';
          description
            "Type of multicast site.";
        }

        container multicast-address-family {
          description
            "Defines protocol to carry multicast.";
          leaf ipv4 {
            if-feature ipv4;
            type boolean;
            default 'false';
            description
              "Enables IPv4 multicast.";
          }

          leaf ipv6 {
            if-feature ipv6;
            type boolean;
            default 'false';
            description
              "Enables IPv6 multicast.";
          }
        }  // container multicast-address-family

        leaf protocol-type {
          type enumeration {
            enum "host" {
              value 0;
              description
                "Hosts are directly connected to the provider network.
      Host protocols such as IGMP or MLD are required.";
            }
            enum "router" {
              value 1;
              description
                "Hosts are behind a customer router.
      PIM will be implemented.";
            }
            enum "both" {
              value 2;
              description
                "Some hosts are behind a customer router, and
      some others are directly connected to the
      provider network.  Both host and routing protocols
      must be used.  Typically, IGMP and PIM will be
      implemented.";
            }
          }
          default "both";
          description
            "Multicast protocol type to be used with the customer site.";
        }
      }  // container multicast
    }  // grouping site-service-multicast

    grouping site-management {
      description
        "Management parameters for the site.";
      container management {
        description
          "Management configuration.";
        leaf type {
          type identityref {
            base management;
          }
          mandatory true;
          description
            "Management type of the connection.";
        }
      }  // container management
    }  // grouping site-management

    grouping site-devices {
      description
        "Grouping for device allocation.";
      container devices {
        when
          "derived-from-or-self(../management/type, "
            + "'l3vpn-svc:provider-managed') or "
            + "derived-from-or-self(../management/type, 'l3vpn-svc:co-managed')" {
          description
            "Applicable only for provider-managed or
   co-managed device.";
        }
        description "Device configuration.";
        list device {
          key "device-id";
          description
            "List of devices requested by customer.";
          leaf device-id {
            type svc-id;
            description
              "Identifier for the device.";
          }

          leaf location {
            type leafref {
              path
                "../../../locations/"
                  + "location/location-id";
            }
            mandatory true;
            description
              "Location of the device.";
          }

          container management {
            when
              "derived-from-or-self(../../../management/type,"
                + "'l3vpn-svc:co-managed')" {
              description
                "Applicable only for co-managed device.";
            }
            description
              "Management configuration.  Applicable only for
      co-managed device.";
            leaf address-family {
              type address-family;
              description
                "Address family used for management.";
            }

            leaf address {
              when "(../address-family)" {
                description
                  "If address-family is specified, then address should
           also be specified.  If address-family is not specified,
           then address should also not be specified.";
              }
              type inet:ip-address;
              mandatory true;
              description
                "Management address.";
            }
          }  // container management
        }  // list device
      }  // container devices
    }  // grouping site-devices

    grouping site-vpn-flavor {
      description
        "Grouping for site VPN flavor.";
      leaf site-vpn-flavor {
        type identityref {
          base site-vpn-flavor;
        }
        default 'site-vpn-flavor-single';
        description
          "Defines the way the VPN multiplexing is done, e.g., whether
   the site belongs to a single VPN site or a multiVPN; or, in the case
   of a multiVPN, whether the logical accesses of the sites belong
   to the same set of VPNs or each logical access maps to
   different VPNs.";
      }
    }  // grouping site-vpn-flavor

    grouping site-vpn-policy {
      description
        "VPN policy parameters for the site.";
      container vpn-policies {
        description "VPN policy.";
        list vpn-policy {
          key "vpn-policy-id";
          description
            "List of VPN policies.";
          leaf vpn-policy-id {
            type svc-id;
            description
              "Unique identifier for the VPN policy.";
          }

          list entries {
            key "id";
            description
              "List of entries for export policy.";
            leaf id {
              type svc-id;
              description
                "Unique identifier for the policy entry.";
            }

            container filters {
              description
                "If a more-granular VPN attachment is necessary, filtering can
      be used.  If used, it permits the splitting of site LANs among
      multiple VPNs.  The Site LAN can be split based on either LAN
      Tag or LAN prefix.  If no filter is used, all the LANs will be
      part of the same VPNs with the same role.";
              list filter {
                key "type";
                ordered-by user;
                description
                  "List of filters used on the site.  This list can
         be augmented.";
                leaf type {
                  type identityref {
                    base vpn-policy-filter-type;
                  }
                  description
                    "Type of VPN Policy filter.";
                }

                leaf-list lan-tag {
                  when
                    "derived-from-or-self(../type, 'l3vpn-svc:lan')" {
                    description
                      "Only applies when the VPN Policy filter is a
         LAN Tag filter.";
                  }
                  if-feature lan-tag;
                  type string;
                  description
                    "List of 'lan-tag' items to be matched.  LAN Tag
         is an Internal tag to be used in VPN policies ";
                }

                leaf-list ipv4-lan-prefix {
                  when
                    "derived-from-or-self(../type, 'l3vpn-svc:ipv4')" {
                    description
                      "Only applies when VPN Policy filter is IPv4 Prefix filter.";
                  }
                  if-feature ipv4;
                  type inet:ipv4-prefix;
                  description
                    "List of IPv4 prefixes as LAN Prefixes to be matched.";
                }

                leaf-list ipv6-lan-prefix {
                  when
                    "derived-from-or-self(../type, 'l3vpn-svc:ipv6')" {
                    description
                      "Only applies when VPN Policy filter is IPv6 Prefix filter.";
                  }
                  if-feature ipv6;
                  type inet:ipv6-prefix;
                  description
                    "List of IPv6 prefixes as LAN prefixes to be matched.";
                }
              }  // list filter
            }  // container filters

            list vpn {
              key "vpn-id";
              description
                "List of VPNs the LAN is associated with.";
              leaf vpn-id {
                type leafref {
                  path
                    "/l3vpn-svc/vpn-services/"
                      + "vpn-service/vpn-id";
                }
                mandatory true;
                description
                  "Reference to an IP VPN.";
              }

              leaf site-role {
                type identityref {
                  base site-role;
                }
                default 'any-to-any-role';
                description
                  "Role of the site in the IP VPN.";
              }
            }  // list vpn
          }  // list entries
        }  // list vpn-policy
      }  // container vpn-policies
    }  // grouping site-vpn-policy

    grouping site-maximum-routes {
      description
        "Defines 'maximum-routes' for the site.";
      container maximum-routes {
        description
          "Defines 'maximum-routes' for the VRF.";
        list address-family {
          key "af";
          description
            "List of address families.";
          leaf af {
            type address-family;
            description "Address family.";
          }

          leaf maximum-routes {
            type uint32;
            description
              "Maximum prefixes the VRF can accept
     for this address family.";
          }
        }  // list address-family
      }  // container maximum-routes
    }  // grouping site-maximum-routes

    grouping site-security {
      description
        "Grouping for security parameters.";
      container security {
        description
          "Site-specific security parameters.";
        uses site-security-authentication;

        uses site-security-encryption;
      }  // container security
    }  // grouping site-security

    grouping site-service {
      description
        "Grouping for service parameters.";
      container service {
        description
          "Service parameters on the attachment.";
        uses site-service-qos-profile;

        uses site-service-mpls;

        uses site-service-multicast;
      }  // container service
    }  // grouping site-service

    grouping site-network-access-service {
      description
        "Grouping for service parameters.";
      container service {
        description
          "Service parameters on the attachment.";
        uses site-service-basic;

        uses site-service-qos-profile;

        uses site-service-mpls;

        uses site-service-multicast;
      }  // container service
    }  // grouping site-network-access-service

    grouping vpn-extranet {
      description
        "Grouping for extranet VPN configuration.
  This provides an easy way to interconnect
  all sites from two VPNs.";
      container extranet-vpns {
        if-feature extranet-vpn;
        description
          "Container for extranet VPN configuration.";
        list extranet-vpn {
          key "vpn-id";
          description
            "List of extranet VPNs or target VPNs the local VPN is
    attached to.";
          leaf vpn-id {
            type svc-id;
            description
              "Identifies the target VPN the local VPN want to access.";
          }

          leaf local-sites-role {
            type identityref {
              base site-role;
            }
            default 'any-to-any-role';
            description
              "This describes the role of the
     local sites in the target VPN topology.  In the any-to-any VPN
     service topology, the local sites must have the same role, which
     will be 'any-to-any-role'.  In the Hub-and-Spoke VPN service
     topology or the Hub-and-Spoke disjoint VPN service topology,
     the local sites must have a Hub role or a Spoke role.";
          }
        }  // list extranet-vpn
      }  // container extranet-vpns
    }  // grouping vpn-extranet

    grouping site-attachment-availability {
      description
        "Defines availability parameters for a site.";
      container availability {
        description
          "Availability parameters (used for multihoming).";
        leaf access-priority {
          type uint32;
          default '100';
          description
            "Defines the priority for the access.
    The higher the access-priority value,
    the higher the preference of the
    access will be.";
        }
      }  // container availability
    }  // grouping site-attachment-availability

    grouping access-vpn-policy {
      description
        "Defines the VPN attachment rules for
  a site's logical access.";
      container vpn-attachment {
        description
          "Defines VPN attachment of a site.";
        choice attachment-flavor {
          mandatory true;
          description
            "Choice for VPN attachment flavor.  A choice is implemented
    to allow the user to choose the flavor that provides the
    best fit.";
          leaf vpn-policy-id {
            type leafref {
              path
                "../../../../"
                  + "vpn-policies/vpn-policy/"
                  + "vpn-policy-id";
            }
            description
              "Reference to a VPN policy.  When referencing VPN
      policy for attachment, the vpn-policy-id must be
      configured.";
          }

          case vpn-id {
            leaf vpn-id {
              type leafref {
                path
                  "/l3vpn-svc/vpn-services"
                    + "/vpn-service/vpn-id";
              }
              description
                "Reference to an IP VPN.  Referencing a vpn-id provides
      an easy way to attach a particular logical access to
      a VPN.  In this case, vpn-id must be configured.";
            }

            leaf site-role {
              type identityref {
                base site-role;
              }
              default 'any-to-any-role';
              description
                "Role of the site in the IP VPN.  When referencing a vpn-id,
      the site-role setting must be added to express the role of
      the site in the target VPN service topology.";
            }
          }  // case vpn-id
        }  // choice attachment-flavor
      }  // container vpn-attachment
    }  // grouping access-vpn-policy

    grouping vpn-profile-cfg {
      description
        "Grouping for VPN Profile configuration.";
      container valid-provider-identifiers {
        nacm:default-deny-write;
        description
          "Container for Valid Provider Identifies.";
        list cloud-identifier {
          if-feature cloud-access;
          key "id";
          description
            "List for Cloud Identifiers.";
          leaf id {
            type string;
            description
              "Identification of cloud service.
     Local administration meaning.";
          }
        }  // list cloud-identifier

        list encryption-profile-identifier {
          key "id";
          description
            "List for encryption profile identifiers.";
          leaf id {
            type string;
            description
              "Identification of the SP encryption profile
     to be used.  Local administration meaning.";
          }
        }  // list encryption-profile-identifier

        list qos-profile-identifier {
          key "id";
          description
            "List for QoS Profile Identifiers.";
          leaf id {
            type string;
            description
              "Identification of the QoS Profile to be used.
     Local administration meaning.";
          }
        }  // list qos-profile-identifier

        list bfd-profile-identifier {
          key "id";
          description
            "List for BFD Profile identifiers.";
          leaf id {
            type string;
            description
              "Identification of the SP BFD Profile to be used.
     Local administration meaning.";
          }
        }  // list bfd-profile-identifier
      }  // container valid-provider-identifiers
    }  // grouping vpn-profile-cfg

    grouping vpn-svc-cfg {
      description
        "Grouping for VPN service configuration.";
      leaf vpn-id {
        type svc-id;
        description
          "VPN identifier.  Local administration meaning.";
      }

      leaf customer-name {
        type string;
        description
          "Name of the customer that actually uses the VPN service.
   In the case that any intermediary (e.g., Tier-2 provider
   or partner) sells the VPN service to their end user
   on behalf of the original service provider (e.g., Tier-1
   provider), the original service provider may require the
   customer name to provide smooth activation/commissioning
   and operation for the service.";
      }

      leaf vpn-service-topology {
        type identityref {
          base vpn-topology;
        }
        default 'any-to-any';
        description "VPN service topology.";
      }

      uses vpn-service-cloud-access;

      uses vpn-service-multicast;

      uses vpn-service-mpls;

      uses vpn-extranet;
    }  // grouping vpn-svc-cfg

    grouping site-top-level-cfg {
      description
        "Grouping for site top-level configuration.";
      uses operational-requirements;

      uses customer-location-info;

      uses site-devices;

      uses site-diversity;

      uses site-management;

      uses site-vpn-policy;

      uses site-vpn-flavor;

      uses site-maximum-routes;

      uses site-security;

      uses site-service;

      uses site-protection;

      uses site-routing;
    }  // grouping site-top-level-cfg

    grouping site-network-access-top-level-cfg {
      description
        "Grouping for site network access top-level configuration.";
      leaf site-network-access-type {
        type identityref {
          base site-network-access-type;
        }
        default 'point-to-point';
        description
          "Describes the type of connection, e.g.,
   point-to-point or multipoint.";
      }

      choice location-flavor {
        mandatory true;
        description
          "Choice of how to describe the site's location.";
        case location {
          when
            "derived-from-or-self(../../management/type, "
              + "'l3vpn-svc:customer-managed')" {
            description
              "Applicable only for customer-managed device.";
          }
          leaf location-reference {
            type leafref {
              path
                "../../../locations/location/location-id";
            }
            description
              "Location of the site-network-access.";
          }
        }  // case location

        case device {
          when
            "derived-from-or-self(../../management/type, "
              + "'l3vpn-svc:provider-managed') or "
              + "derived-from-or-self(../../management/type, "
              + "'l3vpn-svc:co-managed')" {
            description
              "Applicable only for provider-managed or co-managed device.";
          }
          leaf device-reference {
            type leafref {
              path
                "../../../devices/device/device-id";
            }
            description
              "Identifier of CE to use.";
          }
        }  // case device
      }  // choice location-flavor

      uses access-diversity;

      uses site-attachment-bearer;

      uses site-attachment-ip-connection;

      uses site-security;

      uses site-network-access-service;

      uses site-routing;

      uses site-attachment-availability;

      uses access-vpn-policy;
    }  // grouping site-network-access-top-level-cfg

    container l3vpn-svc {
      description
        "Main container for L3VPN service configuration.";
      container vpn-profiles {
        description
          "Container for VPN Profiles.";
        uses vpn-profile-cfg;
      }  // container vpn-profiles

      container vpn-services {
        description
          "Top-level container for the VPN services.";
        list vpn-service {
          key "vpn-id";
          description
            "List of VPN services.";
          uses vpn-svc-cfg;
        }  // list vpn-service
      }  // container vpn-services

      container sites {
        description "Container for sites.";
        list site {
          key "site-id";
          description "List of sites.";
          leaf site-id {
            type svc-id;
            description
              "Identifier of the site.";
          }

          uses site-top-level-cfg;

          uses operational-requirements-ops;

          container site-network-accesses {
            description
              "List of accesses for a site.";
            list site-network-access {
              key "site-network-access-id";
              description
                "List of accesses for a site.";
              leaf site-network-access-id {
                type svc-id;
                description
                  "Identifier for the access.";
              }

              uses site-network-access-top-level-cfg;
            }  // list site-network-access
          }  // container site-network-accesses
        }  // list site
      }  // container sites
    }  // container l3vpn-svc
  }  // module ietf-l3vpn-svc