module ietf-l3vpn-svc {

    namespace "urn:ietf:params:xml:ns:yang:ietf-l3vpn-svc";

    prefix l3vpn-svc;

    import yrt-ietf-inet-types {
        prefix inet;
    }

    import yrt-ietf-yang-types {
        prefix yang;
    }

    organization
     "IETF L3SM Working Group";

    contact
        "WG List:   &lt;mailto:l3sm@ietf.org&gt;

        Editor:

        ";

    description
        "The YANG module defines a generic service configuration
        model for Layer 3 VPN common across all of the vendor
        implementations.";

    revision 2016-07-30 {
        description
        "Eliminated warnings";
        reference
            "draft-ietf-l3sm-l3vpn-service-yang-11";
    }

    revision 2016-07-05 {
        description
        "Draft text update";
        reference
            "draft-ietf-l3sm-l3vpn-service-yang-11";
    }
    revision 2016-06-27 {
        description
        "
        * Removed templates
        * Add site-network-access-type
        * Add a leaf number-of-dynamic-address in case
        of pe-dhcp addressing;

        ";
        reference "draft-ietf-l3sm-l3vpn-service-yang-10";
    }
    revision 2016-06-10 {
        description
         "Add site-vpn-flavor NNI";
        reference "draft-ietf-l3sm-l3vpn-service-yang-09";
    }
    revision 2016-06-09 {
        description
         "Traffic protection moved to site level.
          Decouple operational-requirements in two containers.
         ";
        reference "draft-ietf-l3sm-l3vpn-service-yang-08";
    }
    revision 2016-06-06 {
        description
         "Set config false to actual-site-start and stop
          Add a container before cloud-access list
          Add a container before authorized-sites list
          Add a container before denied-sites list
          Modified access-diversity modeling
          Replacing type placement diversity by an identity";
        reference "draft-ietf-l3sm-l3vpn-service-yang-07";
    }
    revision 2016-04-19 {
        description
         "* remove reference to core routing model :
            created new address family identities
          * added features
          * Modified bearer parameters
          * Modified union for ipv4/ipv6 addresses to ip-address
          type
          * Add BSR parameters for multicast
          * Add applications matching for QoS classification
          ";
        reference "draft-ietf-l3sm-l3vpn-service-yang-06";
    }
    revision 2016-04-05 {
        description
         "
         * Added linecard diverse for site diversity
         * Added a new diversity enum in placement-diversity : none
         * Added state to site location

         ";
        reference "";
    }
    revision 2016-03-11 {
        description
        "
            * Modify VPN policy and creating a vpn-policy-list
            * Add VPN policy reference and VPN ID reference
            under site-network-access
        ";
        reference "draft-ietf-l3sm-l3vpn-service-yang-05";
    }
    revision 2016-01-04 {
        description
        "
            * Add extranet-vpn container in vpn-svc
            * Creating top level containers
            * Refine groupings
            * Added site-vpn-flavor
        ";
        reference "draft-ietf-l3sm-l3vpn-service-yang-03";
    }
    revision 2016-01-04 {
        description
         "
            * qos-profile moved to choice
            * vpn leaf moved to vpn-id in vpn-policy
            * added ordered-by user to qos classification list
            * moved traffic protection to access availability
            * creating a choice in matching filter for VPN policy
            * added dot1p matching field in flow-definition
        ";
        reference "";
    }
    revision 2015-12-07 {
        description
         "
            * A site is now a collection of site-accesses.
            This was introduced to support M to N availability.
            * Site-availability has been removed, replaced by
            availability parameters under site-accesses
            * Added transport-constraints within vpn-svc
        ";
        reference "draft-ietf-l3sm-l3vpn-service-yang-02";
    }
    revision 2015-11-03 {
        description "
        * Add ToS support in match-flow
        * nexthop in cascaded lan as mandatory
        * customer-specific-info deleted and moved to routing
        protocols
        * customer-lan-connection modified : need prefix and CE address
        * add choice in managing PE-CE addressing
        * Simplifying traffic protection
        ";
        reference "";
    }
    revision 2015-09-10 {
        description "
        * Refine groupings for vpn-svc
        * Removed name in vpn-svc
        * id in vpn-svc moved to string
        * Rename id in vpn-svc to vpn-id
        * Changed key of vpn-svc list to vpn-id
        * Add DSCP support in flow definition
        ";
        reference "";
    }
    revision 2015-08-07 {
        description
         "
          Multicast :
            * Removed ACL from security
            * Add FW for site and cloud access
         ";
        reference "";
    }
    revision 2015-08-05 {
        description
         "
          Multicast :
          * Removed anycast-rp identity as discovery mechanism
          * Added rp-group mappings for multicast
          * Added flag for provider managed RP.
         ";
        reference "";
    }
    revision 2015-08-03 {
        description
         " * Creating multiple reusable groupings
           * Added mpls leaf in vpn-svc for carrier's carrier case
           * Modify identity single to single-site
           * Modify site-type to site-role and also child identities.
           * Creating OAM container under site and moved BFD in.
           * Creating flow-definition grouping to be reused
           in ACL, QoS ...
           * Simplified VPN policy.
           * Adding multicast static group to RP mappings.
           * Removed native-vpn and site-role from global site
           cfg, now managed within the VPN policy.
           * Creating a separate list for site templates.
         ";
        reference "draft-ietf-l3sm-l3vpn-service-yang-01";
    }
    revision 2015-07-02 {
        reference "draft-ietf-l3sm-l3vpn-service-yang-00";
    }
    revision 2015-04-24 {
        description "
        * Add encryption parameters
        * Adding holdtime for BFD.
        * Add postal address in location
        ";
        reference "draft-lstd-l3sm-l3vpn-service-yang-00";
    }
    revision 2015-02-05 {
        description "Initial revision.";
        reference "draft-l3vpn-service-yang-00";
    }

    /* Features */

    feature cloud-access {
        description
         "Allow VPN to connect to a Cloud Service
         provider.";
    }
    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 carrierscarrier {
        description
        "Enables support of carrier's carrier";
    }
    feature traffic-engineering {
        description
        "Enables support of transport constraint.";
    }
    feature traffic-engineering-multicast {
        description
        "Enables support of transport constraint
        for multicast.";
    }
    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 Class of Services";
    }
    feature qos-custom {
        description
        "Enables support of custom qos profile";
    }
    feature rtg-bgp {
        description
        "Enables support of BGP routing protocol.";
    }
    feature rtg-rip {
        description
        "Enables support of RIP routing protocol.";
    }
    feature rtg-ospf {
        description
        "Enables support of OSPF routing protocol.";
    }
    feature rtg-ospf-sham-link {
        description
        "Enables support of OSPF sham-links.";
    }
    feature rtg-vrrp {
        description
        "Enables support of 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 for always-on access
        constraint.";
    }
    feature requested-type {
        description
        "Enables support for requested-type access
        constraint.";
    }
    feature bearer-reference {
        description
        "Enables support for bearer-reference access
        constraint.";
    }

    /* Typedefs */

    typedef svc-id {
        type string;
        description
         "Defining a type of service component
         identificators.";
    }

    typedef template-id {
        type string;
        description
         "Defining a type of service template
         identificators.";
    }

    /* Identities */

    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 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 applications";
    }
    identity file-transfer {
        base customer-application;
        description
         "Identity for file transfer applications (
         e.g. FTP, SFTP, ...)";
    }
    identity database {
        base customer-application;
        description
         "Identity for database applications";
    }
    identity social {
        base customer-application;
        description
         "Identity for social network applications";
    }
    identity games {
        base customer-application;
        description
         "Identity for gaming applications";
    }
    identity p2p {
        base customer-application;
        description
         "Identity for peer to peer applications";
    }
    identity network-management {
        base customer-application;
        description
         "Identity for management applications (e.g. telnet
            syslog, snmp ...)";
    }
    identity voice {
        base customer-application;
        description
         "Identity for voice applications";
    }
    identity video {
        base customer-application;
        description
         "Identity for video conference applications";
    }
    identity address-family {
        description
         "Base identity for an address family.";
    }
    identity ipv4 {
        base address-family;
        description
        "Identity for IPv4 address family.";
    }
    identity ipv6 {
        base address-family;
        description
        "Identity for IPv6 address family.";
    }
    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 of the 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 a NNI option A connection.";
    }
    identity transport-constraint {
        description
         "Base identity for transport constraint.";
    }
    identity tc-latency {
        base transport-constraint;
        description
         "Base identity for transport constraint
         based on latency.";
    }
    identity tc-jitter {
        base transport-constraint;
        description
         "Base identity for transport constraint
         based on jitter.";
    }
    identity tc-bandwidth {
        base transport-constraint;
        description
         "Base identity for transport constraint
         based on bandwidth.";
    }
    identity tc-path-diversity {
        base transport-constraint;
        description
         "Base identity for transport constraint
         based on path diversity.";
    }
    identity tc-site-diversity {
        base transport-constraint;
        description
         "Base identity for transport constraint
         based on site diversity.";
    }
    identity management {
        description
         "Base identity for site management scheme.";
    }
    identity co-managed {
        base management;
        description
         "Base identity for comanaged 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 pe-dhcp {
        base address-allocation-type;
        description
         "PE router provides DHCP service to CE.";
    }
    identity static-address {
        base address-allocation-type;
        description
         "PE-CE 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 a any to any IPVPN.";
    }
    identity spoke-role {
        base site-role;
        description
         "Spoke Site in a Hub & Spoke IPVPN.";
    }
    identity hub-role {
        base site-role;
        description
         "Hub Site in a Hub & Spoke IPVPN.";
    }
    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'n'Spoke VPN topology.";
    }
    identity hub-spoke-disjoint {
        base vpn-topology;
        description
         "Identity for Hub'n'Spoke VPN topology
          where Hubs cannot talk between 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 BiDir 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 BDR 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 rip-ng {
        base routing-protocol-type;
        description
         "Identity for RIPng protocol type.";
    }
    identity vrrp {
        base routing-protocol-type;
        description
         "Identity for VRRP protocol type.
         This is to be used when LAn are directly connected
         to provider Edge 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
         "icmp v6 protocol type.";
    }
    identity gre {
        base protocol-type;
        description
         "GRE protocol type.";
    }
    identity ipip {
        base protocol-type;
        description
         "IPinIP 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.";
    }

    /* Groupings */

    grouping vpn-service-cloud-access {
        container cloud-accesses {
        list cloud-access {
            if-feature cloud-access;
            key cloud-identifier;

            leaf cloud-identifier {
                type string;
                description
                 "Identification of cloud service. Local
                 admin meaning.";
            }
            container authorized-sites {
                list authorized-site {
                    key site-id;

                    leaf site-id {
                        type leafref {
                            path "/l3vpn-svc/sites/site/site-id";
                        }
                        description
                         "Site ID.";
                    }
                    description
                     "List of authorized sites.";
                }
                description
                "Configuration of authorized sites";
            }
            container denied-sites {
                list denied-site {
                    key site-id;

                    leaf site-id {
                        type leafref {
                            path "/l3vpn-svc/sites/site/site-id";
                        }
                        description
                         "Site ID.";
                    }
                    description
                     "List of denied sites.";
                }
                description
                "Configuration of denied sites";
            }
            leaf nat-enabled {
                type boolean;
                description
                 "Control if NAT is required or not.";
            }
            leaf customer-nat-address {
                type inet:ipv4-address;
                description
                 "NAT address to be used in case of public
                 or shared cloud.
                 This is to be used in case customer is providing
                 the public address.";
            }
            description
             "Cloud access configuration.";
        }
            description
             "Container for cloud access configurations";
        }
        description
         "grouping for vpn cloud definition";
    }

    grouping multicast-rp-group-cfg {
        choice group-format {
            case startend {
                leaf group-start {
                    type inet:ip-address;
                    description
                     "First group address.";
                }
                leaf group-end {
                    type inet:ip-address;
                    description
                     "Last group address.";
                }
            }
            case singleaddress {
                leaf group-address {
                    type inet:ip-address;
                    description
                     "Group address";
                }
            }
            description
             "Choice for group format.";
        }
        description
         "Definition of groups for
         RP to group mapping.";
    }

    grouping vpn-service-multicast {
        container multicast {
            if-feature multicast;
            leaf enabled {
                type boolean;
                default false;
                description
                 "Enable multicast.";
            }
            container customer-tree-flavors {
                list tree-flavor {
                    key type;

                    leaf type {
                        type identityref {
                            base multicast-tree-type;
                        }
                        description
                         "Type of tree to be used.";
                    }
                    description
                     "List of tree flavors.";
                }
                description
                 "Type of trees used by customer.";
            }
            container rp {
                container rp-group-mappings {
                    list rp-group-mapping {
                        key "id";

                        leaf id {
                            type uint16;
                            description
                             "Unique identifier for the mapping.";
                        }
                        container provider-managed {
                            leaf enabled {
                                type boolean;
                                default false;
                                description
                                 "Set to true, if the RP must be a
                                 provider
                                 managed node.
                                 Set to false, if it is a customer
                                 managed node.";
                            }

                            leaf rp-redundancy {
                                when "../enabled = 'true'" {
                                    description
                                     "Relevant when RP
                                     is provider managed.";
                                }
                                type boolean;
                                default false;
                                description
                                 "If true, redundancy
                                 mechanism for RP is required.";
                            }
                            leaf optimal-traffic-delivery {
                                when "../enabled = 'true'" {
                                    description
                                     "Relevant when RP
                                     is provider managed.";
                                }
                                type boolean;
                                default false;
                                description
                                 "If true, SP must ensure
                                 that traffic uses an optimal path.";
                            }
                            description
                             "Parameters for provider managed RP.";
                        }

                        leaf rp-address {
                            when "../provider-managed/enabled='false'" {
                                description
                                 "Relevant when RP
                                 is provider managed.";
                            }
                            type inet:ip-address;
                            description
                            "Defines the address of the
                            RendezvousPoint.
                            Used if RP is customer managed.";
                        }

                        container groups {
                            list group {
                                key id;

                                leaf id {
                                    type uint16;
                                    description
                                     "Identifier for the group.";
                                }
                                uses multicast-rp-group-cfg;
                                description
                                "List of groups.";
                            }
                            description
                             "Multicast groups associated with RP.";
                        }

                        description
                         "List of RP to group mappings.";
                    }
                    description
                    "RP to group mappings.";
                }
                container rp-discovery {
                    leaf rp-discovery-type {
                        type identityref {
                            base multicast-rp-discovery-type;
                        }
                        default static-rp;
                        description
                         "Type of RP discovery used.";
                    }
                    container bsr-candidates {
                        when "../rp-discovery-type='bsr-rp'" {
                            description
                             "Only applicable if discovery type
                             is BSR-RP";
                        }
                        list bsr-candidate {
                            key address;

                            leaf address {
                                type inet:ip-address;
                                description
                                 "Address of BSR candidate";
                            }

                            description
                             "List of customer BSR candidates";
                        }
                        description
                         "Customer BSR candidates address";
                    }
                    description
                     "RP discovery parameters";
                }

                description
                 "RendezvousPoint parameters.";
            }
            description
                "Multicast global parameters for the VPN service.";
        }
        description
         "grouping for multicast vpn definition";
    }

    grouping vpn-service-mpls {
        leaf carrierscarrier {
            if-feature carrierscarrier;
            type boolean;
            default false;
            description
             "The VPN is using Carrier's Carrier,
             and so MPLS is required.";
        }
        description
         "grouping for mpls CsC definition";
    }

    grouping customer-location-info {
        container location {
                leaf address {
                    type string;
                    description
                    "Address (number and street)
                    of the site.";

                }
                leaf zip-code {
                    type string;
                    description
                    "ZIP code of the site.";
                }
                leaf state {
                    type string;
                    description
                    "State of the site.
                    This leaf can also be used
                    to describe a region
                    for country who does not have
                    states.
                    ";
                }
                leaf city {
                    type string;
                    description
                     "City of the site.";
                }
                leaf country-code {
                    type string;
                    description
                     "Country of the site.";
                }
                description
                    "Location of the site.";
        }
        description
         "This grouping defines customer location
          parameters";
    }

    grouping site-diversity {
        container site-diversity {

                container groups {
                    list group {
                        key group-id;

                        leaf group-id {
                            type string;
                        }
                    }
                }
            }
    }

    grouping access-diversity {
        container access-diversity {
                if-feature site-diversity;
                container groups {
                    list group {
                        key group-id;

                        leaf group-id {
                            type string;
                            description
                             "Group-id the site network access
                             is belonging to";
                        }
                        description
                        "List of group-id";
                    }
                    description
                     "Groups the site network access
                     is belonging to";
                }
                container constraints {
                    list constraint {
                        key constraint-type;

                        leaf constraint-type {
                            type identityref {
                                base placement-diversity;
                            }
                            description
                             "Diversity constraint type.";
                        }
                        container target {
                            choice target-flavor {
                                case id {
                                    list group {
                                        key group-id;

                                        leaf group-id {
                                            type string;
                                            description
                                             "The constraint will apply
                                             against this particular
                                             group-id";
                                        }
                                        description
                                         "List of groups";
                                    }
                                }
                                case all-accesses {
                                    leaf all-other-accesses {
                                        type empty;
                                        description
                                         "The constraint will apply
                                         against all other site network
                                         access
                                         of this site";
                                    }
                                }
                                case all-groups {
                                    leaf all-other-groups {
                                        type empty;
                                        description
                                         "The constraint will apply
                                         against all other groups the
                                         customer
                                         is managing";
                                    }
                                }
                                description
                                 "Choice for the group definition";
                            }
                            description
                             "The constraint will apply against
                             this list of groups";
                        }
                        description
                         "List of constraints";
                    }
                    description
                     "Constraints for placing this site
                     network access";
                }

                description
                     "Diversity parameters.";
            }
        description
         "This grouping defines access diversity
          parameters";
    }

    grouping operational-requirements {
          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";
           }
        description
         "This grouping defines some operational parameters
          parameters";
    }

    grouping operational-requirements-ops {
           leaf actual-site-start {
               type yang:date-and-time;
               config false;
               description
                "Optional leaf indicating actual date
                and time
                when the service at a particular site
                actually
                started";
           }
           leaf actual-site-stop {
               type yang:date-and-time;
               config false;
               description
                "Optional leaf indicating actual date
                and time
                when the service at a particular site
                actually
                stopped";
           }
        description
         "This grouping defines some operational parameters
          parameters";
    }

    grouping flow-definition {
        container match-flow {
            leaf dscp {
                type uint8 {
                    range "0 .. 63";
                }
                description
                 "DSCP value.";
            }
            leaf tos {
                type uint8 {
                    range "0 .. 254";
                }
                description
                 "TOS 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 uint16;
                description
                 "Match on layer 4 src port.";
            }
            leaf l4-dst-port {
                type uint16;
                description
                 "Match on layer 4 dst port.";
            }
            leaf protocol-field {
                type union {
                    type uint8;
                    type identityref {
                        base protocol-type;
                    }
                }
                description
                 "Match on IPv4 protocol or
                  Ipv6 Next Header
                 field.";
            }

            description
             "Describe flow matching
             criterions.";
        }
        description
         "Flow definition based on criteria.";
    }

    grouping site-service-basic {
        leaf svc-input-bandwidth {
               type uint32;
               units bps;
               description
                "From the PE perspective, the service input
                bandwidth of the connection.";
        }
        leaf svc-output-bandwidth {
           type uint32;
           units bps;
           description
            "From the PE perspective, the service output
            bandwidth of the connection.";
        }
        leaf svc-mtu {
            type uint16;
            units bytes;
            description
             "MTU at service level.
             If the service is IP,
             it refers to the IP MTU.";
        }
        description
         "Defines basic service parameters for a site.";
    }

    grouping site-protection {
        container traffic-protection {
            if-feature fast-reroute;
            leaf enabled {
                type boolean;
                description
                 "Enables
                 traffic protection of access link.";
            }

            description
             "Fast reroute service parameters
             for the site.";
        }
        description
         "Defines protection service parameters for a site.";
    }

    grouping site-service-mpls {
        container carrierscarrier {
            if-feature carrierscarrier;
            leaf signalling-type {
                type enumeration {
                    enum "ldp" {
                        description
                            "Use LDP as signalling
                            protocol between PE and CE.";
                    }
                    enum "bgp" {
                        description
                            "Use BGP 3107 as signalling
                            protocol between PE and CE.
                            In this case, bgp must be also
                            configured
                            as routing-protocol.
                            ";
                    }
                }
                description
                 "MPLS signalling type.";
            }
            description
             "This container is used when customer provides
             MPLS based services.
             This is used in case of Carrier's
             Carrier.";
        }
        description
         "Defines MPLS service parameters for a site.";
    }

    grouping site-service-qos-profile {
        container qos {
            if-feature qos;
            container qos-classification-policy {
                list rule {
                    key id;
                    ordered-by user;

                    leaf id {
                        type uint16;
                        description
                         "ID of the rule.";
                    }

                    choice match-type {
                        case match-flow {
                            uses flow-definition;
                        }
                        case match-application {
                            leaf match-application {
                                type identityref {
                                    base customer-application;
                                }
                                description
                                 "Defines the application
                                 to match.";
                            }
                        }
                        description
                         "Choice for classification";
                    }

                    leaf target-class-id {
                        type string;
                        description
                         "Identification of the
                         class of service.
                         This identifier is internal to
                         the administration.";
                    }

                    description
                     "List of marking rules.";
                }
                description
                 "Need to express marking rules ...";
            }
            container qos-profile {

                choice qos-profile {
                    description
                     "Choice for QoS profile.
                     Can be standard profile or custom.";
                    case standard {
                        leaf profile {
                            type string;
                            description
                             "QoS profile to be used";
                        }
                    }
                    case custom {
                        container classes {
                            if-feature qos-custom;
                            list class {
                                key class-id;

                                leaf class-id {
                                    type string;
                                    description
                                     "Identification of the
                                     class of service.
                                     This identifier is internal to
                                     the administration.";
                                }
                                leaf rate-limit {
                                    type uint8;
                                    units percent;
                                    description
                                     "To be used if class must
                                     be rate
                                     limited. Expressed as
                                     percentage of the svc-bw.";
                                }
                                leaf priority-level {
                                    type uint8;
                                    description
                                     "Defines the level of the
                                     class in
                                     term of priority queueing.
                                      The higher the level is the
                                      higher
                                      is the priority.";
                                }
                                leaf guaranteed-bw-percent {
                                    type uint8;
                                    units percent;
                                    description
                                     "To be used to define the
                                     guaranteed
                                     BW in percent of the svc-bw
                                     available at the priority-level.";
                                }
                                description
                                 "List of class of services.";
                            }
                            description
                                 "Container for
                                 list of class of services.";
                        }

                    }

                }
                description
                "Qos profile configuration.";
            }
            description
             "QoS configuration.";
        }
        description
         "This grouping defines QoS parameters
         for a site";

    }

    grouping site-security-authentication {
        container authentication {
            description
             "Authentication parameters";
        }
        description
         "This grouping defines authentication
         parameters
         for a site";
    }

    grouping site-security-encryption {
        container encryption {
            if-feature encryption;
            leaf enabled {
                type boolean;
                description
                 "If true, access encryption is required.";
            }
            leaf layer {
                type enumeration {
                    enum layer2 {
                        description
                         "Encryption will occur at layer2.";
                    }
                    enum layer3 {
                        description
                         "IPSec is requested.";
                    }
                }
                description
                 "Layer on which encryption is applied.";
            }
            container encryption-profile {
                choice profile {
                    case provider-profile {
                        leaf profile-name {
                            type string;
                            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 {
                            case psk {
                                leaf preshared-key {
                                    type string;
                                    description
                                     "Key coming from
                                     customer.";
                                }
                            }
                            case pki {

                            }
                            description
                             "Type of keys to be used.";
                        }
                    }
                    description
                     "Choice of profile.";
                }
                description
                 "Profile of encryption to be applied.";
            }
            description
             "Encryption parameters.";
        }
        description
         "This grouping defines encryption parameters
         for a site";
    }

    grouping site-attachment-bearer {
        container bearer {
            container requested-type {
                if-feature requested-type;
                leaf requested-type { /* this leaf not used*/
                    type string;
                    description
                     "Type of requested bearer Ethernet, DSL,
                     Wireless ...
                     Operator specific.";
                }
                leaf strict {  /* this leaf not used*/
                    type boolean;
                    default false;
                    description
                     "define if the requested-type is a preference
                     or a strict requirement.";
                }
                description
                 "Container for requested type.";
            }
            leaf always-on { /* this leaf not used*/
                if-feature always-on;
                type boolean;
                default true;
                description
                "Request for an always on access type.
                This means no Dial access type for
                example.";
            }
            leaf bearer-reference { /* this leaf not used*/
                if-feature bearer-reference;
                type string;
                description
                 "This is an internal reference for the
                 service provider.
                 Used ";
            }
            description
             "Bearer specific parameters.
             To be augmented.";
        }
        description
         "Defines physical properties of
         a site attachment.";
    }

    grouping site-routing {
        container routing-protocols {
            list routing-protocol {
                key type;

                leaf type {
                    type identityref {
                        base routing-protocol-type;
                    }
                    description
                     "Type of routing protocol.";
                }

/* From here nothing is used*/
                container ospf {
                    when "../type = 'ospf'" {
                        description
                         "Only applies
                         when protocol is OSPF.";
                    }
                    if-feature rtg-ospf;
                    leaf-list address-family {
                        type identityref {
                            base address-family;
                        }
                        description
                         "Address family to be activated.";
                    }
                    leaf area-address {
                        type yang:dotted-quad;
                        description
                         "Area address.";
                    }
                    leaf metric {
                        type uint16;
                        description
                         "Metric of PE-CE link.";
                    }
                    container sham-links {
                        if-feature rtg-ospf-sham-link;
                        list sham-link {
                            key target-site;

                            leaf target-site {
                                type svc-id;
                                description
                                 "Target site for the sham link
                                  connection.
                                  The site is referred through it's ID.";
                            }
                            leaf metric {
                                type uint16;
                                description
                                 "Metric of the sham link.";
                            }
                            description
                             "Creates a shamlink with another
                             site";
                        }
                        description
                         "List of Sham links";
                    }
                    description
                     "OSPF specific configuration.";
                }

                container bgp {

                    when "../type = 'bgp'" {
                        description
                         "Only applies when
                         protocol is BGP.";
                    }
                    if-feature rtg-bgp;
                    leaf autonomous-system {
                        type uint32;
                        description
                         "AS number.";
                    }
                    leaf-list address-family {
                        type identityref {
                            base address-family;
                        }
                        description
                         "Address family to be activated.";
                    }
                    description
                     "BGP specific configuration.";
                }
                container static {
                    when "../type = 'static'" {
                        description
                         "Only applies when protocol
                         is static.";
                    }

                    container cascaded-lan-prefixes {
                        list ipv4-lan-prefixes {
                            if-feature ipv4;
                            key "lan next-hop";

                            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
                                 "Nexthop address to use at customer
                                 side.";
                            }
                            description "
                                List of LAN prefixes for
                                the site.
                                ";
                        }
                        list ipv6-lan-prefixes {
                            if-feature ipv6;
                            key "lan next-hop";

                            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
                                 "Nexthop address to use at
                                 customer side.";
                            }
                            description "
                                List of LAN prefixes for the site.
                                ";
                        }
                        description
                            "LAN prefixes from the customer.";
                    }
                    description
                     "Static routing
                     specific configuration.";
                }
                container rip {

                    when "../type = 'rip'" {
                        description
                         "Only applies when
                         protocol is RIP.";
                    }
                    if-feature rtg-rip;
                    leaf-list address-family {
                        type identityref {
                            base address-family;
                        }
                        description
                         "Address family to be
                         activated.";
                    }

                    description
                     "RIP routing specific
                     configuration.";
                }


                container vrrp {

                    when "../type = 'vrrp'" {
                        description
                         "Only applies when
                         protocol is VRRP.";
                    }
                    if-feature rtg-vrrp;
                    leaf-list address-family {
                        type identityref {
                            base address-family;
                        }
                        description
                         "Address family to be activated.";
                    }
                    description
                     "VRRP routing specific configuration.";
                }


                description
                 "List of routing protocols used
                 on the site.
                 Need to be augmented.";
            }
            description
             "Defines routing protocols.";
        }
        description
         "Grouping for routing protocols.";
    }

    grouping site-attachment-ip-connection {
        container ip-connection {
            container ipv4 {
                if-feature ipv4;
                leaf address-allocation-type { /*this is not used*/
                    type identityref {
                        base address-allocation-type;
                    }

                    default "static-address";
                    description
                     "Defines how addresses are allocated.
                     ";
                }

                leaf number-of-dynamic-address { /*this is not used*/
                    when
                    "../address-allocation-type = 'pe-dhcp'"
                     {
                        description
                         "Only applies when
                         protocol allocation type is static";
                    }
                    type uint8;
                    default 1;
                    description
                     "Describes the number of IP addresses the
                     customer requires";
                }
                container addresses {
                    when
                    "../address-allocation-type = 'static-address'" {
                        description
                         "Only applies when
                         protocol allocation type is static";
                    }
                    leaf provider-address {
                        type inet:ipv4-address;
                        description
                         "Provider side address.";
                    }
                    leaf customer-address { /*this is not used*/
                        type inet:ipv4-address;
                        description
                         "Customer side address.";
                    }
                    leaf mask {
                        type uint8 {
                            range "0..32";
                        }
                        description
                         "Subnet mask expressed
                         in bits";
                    }
                    description
                     "Describes IP addresses used";
                }
                description
                 "IPv4 specific parameters";

            }
            container ipv6 {
                if-feature ipv6;
                leaf address-allocation-type { /*this is not used*/
                    type identityref {
                        base address-allocation-type;
                    }
                    default "static-address";
                    description
                     "Defines how addresses are allocated.
                     ";
                }
                leaf number-of-dynamic-address { /*this is not used*/
                    when
                    "../address-allocation-type = 'pe-dhcp'" {
                        description
                         "Only applies when
                         protocol allocation type is static";
                    }
                    type uint8;
                    default 1;
                    description
                     "Describes the number of IP addresses the
                     customer requires";
                }
                container addresses {
                    when
                    "../address-allocation-type = 'static-address'" {
                        description
                         "Only applies when
                         protocol allocation type is static";
                    }
                    leaf provider-address {
                        type inet:ipv6-address;
                        description
                         "Provider side address.";
                    }
                    leaf customer-address { /*this is not used*/
                        type inet:ipv6-address;
                        description
                         "Customer side address.";
                    }
                    leaf mask {
                        type uint8 {
                            range "0..128";

                        }
                        description
                         "Subnet mask expressed
                         in bits";
                    }
                    description
                     "Describes IP addresses used";
                }

                description
                 "IPv6 specific parameters";

            }
            container oam { /*this is not used*/
                container bfd {
                    if-feature bfd;
                    leaf bfd-enabled {
                        type boolean;
                        description
                         "BFD activation";
                    }

                    choice holdtime {
                        case profile {
                            leaf profile-name {
                                type string;
                                description
                                 "Service provider well
                                 known profile.";
                            }
                            description
                                 "Service provider well
                                 known profile.";
                        }
                        case fixed {
                            leaf fixed-value {
                                type uint32;
                                units msec;
                                description
                                 "Expected holdtime
                                 expressed
                                 in msec.";
                            }
                        }
                        description
                         "Choice for holdtime flavor.";
                    }
                    description
                     "Container for BFD.";
                }
                description
                 "Define the OAM used on the connection.";
            }
            description
             "Defines connection parameters.";
        }
        description
         "This grouping defines IP connection parameters.";
    }

    grouping site-service-multicast {
        container multicast {
            if-feature multicast;
            leaf multicast-site-type {
                type enumeration {
                    enum receiver-only {
                        description
                         "The site has only receivers.";
                    }
                    enum source-only {
                        description
                         "The site has only sources.";
                    }
                    enum source-receiver {
                        description
                         "The site has both
                         sources & receivers.";
                    }
                }
                default "source-receiver";
                description
                 "Type of multicast site.";
            }
            container multicast-transport-protocol {
                leaf ipv4 {
                    if-feature ipv4;
                    type boolean;
                    default true;
                    description
                        "Enables ipv4 multicast transport";
                }
                leaf ipv6 {
                    if-feature ipv6;
                    type boolean;
                    default false;
                    description
                        "Enables ipv6 multicast transport";
                }
                description
                 "Defines protocol to transport multicast.";
            }
            leaf protocol-type {
                type enumeration {
                    enum host {
                        description
                         "
                         Hosts are directly connected
                         to the provider network.
                         Host protocols like IGMP, MLD
                         are required.
                         ";
                    }
                    enum router {
                        description
                         "
                         Hosts are behind a customer router.
                         PIM will be implemented.
                         ";
                    }
                    enum both {
                        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.";
            }

            description
             "Multicast parameters for the site.";
        }
        description
          "Multicast parameters for the site.";
    }

    grouping site-management {
        container management {
            leaf type {
                type identityref {
                    base management;
                }
            }
            leaf management-transport {
                type identityref {
                    base address-family;
                }
            }
            leaf address {
                type inet:ip-address;
            }
        }
    }

    grouping site-vpn-flavor-profile {
        leaf site-vpn-flavor {
            type identityref {
                base site-vpn-flavor;
            }
            default site-vpn-flavor-single;
            description
             "Defines if the site
            is a single VPN site, or multiVPN or ...";
        }
        description
         "Grouping for site-vpn-flavor.";
    }

    grouping site-vpn-policy {
        container vpn-policy-list {
            list vpn-policy {
                key vpn-policy-id;

                leaf vpn-policy-id {
                    type svc-id;
                    description
                     "Unique identifier for
                     the VPN policy.";
                }

                list entries {
                    key id;

                    leaf id {
                            type svc-id;
                            description
                             "Unique identifier for
                              the policy entry.";
                    }
                    container filter {
                        choice lan {
                            case lan-prefix {
                                container lan-prefixes {
                                    list ipv4-lan-prefixes {
                                        if-feature ipv4;
                                        key lan;

                                        leaf lan {
                                            type inet:ipv4-prefix;
                                            description
                                             "Lan prefixes.";
                                        }
                                        description "
                                            List of LAN prefixes
                                            for the site.
                                            ";
                                    }
                                    list ipv6-lan-prefixes {
                                        if-feature ipv6;
                                        key lan;

                                        leaf lan {
                                            type inet:ipv6-prefix;
                                            description
                                             "Lan prefixes.";
                                        }
                                        description "
                                            List of LAN prefixes
                                            for the site.
                                            ";
                                    }
                                    description
                                     "LAN prefixes from the customer.";
                                }
                            }
                            case lan-tag {
                                leaf-list lan-tag {
                                    type string;
                                    description
                                     "List of lan-tags to be matched.";
                                }
                            }
                            description
                             "Choice for LAN matching type";
                        }
                        description
                         "If used, it permit to split site LANs
                         among multiple VPNs.
                         If no filter used, all the LANs will be
                         part of the same VPNs with the same
                         role.";
                    }
                    container vpn {
                        leaf vpn-id {
                            type leafref {
                                path "/l3vpn-svc/vpn-services/vpn-svc/vpn-id";
                            }
                            mandatory true;
                            description
                             "Reference to an IPVPN.";
                        }
                        leaf site-role {
                            type identityref {
                                base site-role;
                            }
                            mandatory true;
                            description
                             "Role of the site in the IPVPN.";
                        }
                        description
                         "List of VPNs the LAN is associated to.";
                    }
                    description
                     "List of entries for export policy.";
                }
                description
                 "List of VPN policies.";
            }
            description
                 "VPN policy.";
        }
        description
          "VPN policy parameters for the site.";
    }

    grouping site-maximum-routes {
        container maximum-routes {
            list address-family {
                key af;

                leaf af {
                    type identityref {
                        base address-family;
                    }
                    description
                     "Address-family.";
                }
                leaf maximum-routes {
                    type uint32;
                    description
                     "Maximum prefixes the VRF can
                     accept for this
                     address-family.";
                }
                description
                 "List of address families.";
            }

            description
             "Define maximum-routes for the VRF.";
        }
        description
        "Define maximum-routes for the site.";
    }

    grouping site-security {
        container security {
            uses site-security-authentication;
            uses site-security-encryption;

            description
             "Site specific security parameters.";
        }
        description
         "Grouping for security parameters.";
    }

    grouping site-service {
        container service {
            uses site-service-basic;
            uses site-service-qos-profile;
            uses site-service-mpls;
            uses site-service-multicast;

            description
             "Service parameters on the attachement.";
        }
        description
         "Grouping for service parameters.";
    }

    grouping transport-constraint-profile {
        list constraint-list {
            key constraint-type;

            leaf constraint-type {
                type identityref {
                    base transport-constraint;
                }
                description
                 "Constraint type to be applied.";
            }
            leaf constraint-opaque-value {
                type string;
                description
                "Opaque value that can be used to
                specify constraint parameters.";
            }
            description
             "List of constraints";
        }
        description
         "Grouping for transport constraint.";
    }

    grouping transport-constraints {
        container transport-constraints {
            if-feature traffic-engineering;
            container unicast-transport-constraints {
                list constraint {
                    key constraint-id;

                    leaf constraint-id {
                        type svc-id;
                        description
                         "Defines an ID for the constraint
                         rule.";
                    }

                    leaf site1 {
                        type svc-id;
                        description
                         "The ID refers to one site end.";
                    }
                    leaf site2 {
                        type svc-id;
                        description
                         "The ID refers to the other
                         site end.";
                    }
                    uses transport-constraint-profile;
                    description
                     "List of constraints.
                     Constraints are bidirectional.";
                }
                description
                 "Unicast transport constraints.";
            }
            container multicast-transport-constraints {
                if-feature traffic-engineering-multicast;
                list constraint {
                    key constraint-id;

                    leaf constraint-id {
                        type svc-id;
                        description
                         "Defines an ID for the constraint
                         rule.";
                    }

                    leaf src-site {
                        type svc-id;
                        description
                         "The ID refers to source site.";
                    }
                    leaf dst-site {
                        type svc-id;
                        description
                         "The ID refers to the receiver
                         site.";
                    }
                    uses transport-constraint-profile;
                    description
                     "List of constraints.
                     Constraints are unidirectional.";
                }
                description
                 "Multicast transport constraints.";
            }
            description
                 "transport constraints.";
        }
        description
         "Grouping for transport constraints
         description.";
    }

    grouping vpn-extranet {
        container extranet-vpns {
            if-feature extranet-vpn;
            list extranet-vpn {
                key vpn-id;

                leaf vpn-id {
                    type svc-id;
                    description
                        "Identifies the target VPN";
                }
                leaf local-sites-role {
                    type identityref {
                        base site-role;
                    }
                    description
                     "This describes the role of the
                     local sites in the target VPN topology.";
                }
                description
                 "List of extranet VPNs the local
                 VPN is attached to.";
            }
            description
             "Container for extranet vpn cfg.";
        }
        description
            "grouping for extranet VPN configuration.
            Extranet provides a way to interconnect all sites
            from two VPNs in a easy way.";
    }

    grouping site-attachment-availability {
        container availability {
            leaf access-priority {
                type uint32;
                default 1;
                description
                 "Defines the priority for the access.
                 The highest the priority value is,
                 the highest the
                 preference of the access is.";
            }
            description
             "Availability parameters
             (used for multihoming)";
        }
        description
         "Defines site availability parameters.";
    }

    grouping access-vpn-policy {
        container vpn-attachment {
            choice attachment-flavor {
                case vpn-policy-id { /* this is not used */
                    leaf vpn-policy-id {
                        type leafref {
                            path "/l3vpn-svc/sites/site/"+
                            "vpn-policy-list/vpn-policy/"+
                            "vpn-policy-id";
                        }
                        description
                         "Reference to a VPN policy.";
                    }
                }
                case vpn-id { /* this is used */
                    leaf vpn-id {
                        type leafref {
                            path "/l3vpn-svc/vpn-services"+
                            "/vpn-svc/vpn-id";
                        }
                        description
                            "Reference to a VPN.";
                    }
                    leaf site-role {
                        type identityref {
                                base site-role;
                            }
                        mandatory true;
                        description
                         "Role of the site in the IPVPN.";
                    }
                }
                mandatory true;
                description
                 "Choice for VPN attachment flavor.";
            }
            description
             "Defines VPN attachment of a site.";
        }
        description
         "Defines the VPN attachment rules
         for a site logical access.";
    }

    grouping vpn-svc-cfg {
        leaf vpn-id {
                type svc-id;
                description
                "VPN identifier. Local administration meaning.";
            }
        leaf customer-name {
            type string;
            description
             "Name of the customer.";
        }
        leaf topology {
            type identityref {
                base vpn-topology;
            }
            default "any-to-any";
            description
             "VPN topology.";
        }

        uses vpn-service-cloud-access;
        uses vpn-service-multicast;
        uses vpn-service-mpls;
        uses transport-constraints;
        uses vpn-extranet;
    }

    grouping site-top-level-cfg {
        uses operational-requirements; // done /* Not used*/
        uses customer-location-info;  // done
        uses site-diversity;  // done
        uses site-management;  // done
        uses site-vpn-policy;  // done
        uses site-vpn-flavor-profile; // done
        uses site-maximum-routes; // done
        uses site-security; // done
        uses site-service;
        uses site-protection;
        uses site-routing; /*Will be used later*/

        description
         "Grouping for site top level cfg.";
    }

    grouping site-network-access-top-level-cfg {
        leaf site-network-access-type { /* this is not used*/
            type identityref {
                base site-network-access-type;
            }
            default "point-to-point";
            description
            "Describes the type of connection, e.g. :
            point-to-point or multipoint";
        }
        uses access-diversity; /* this is not used*/
        uses site-attachment-bearer; /* this is used*/
        uses site-attachment-ip-connection; /* this is used*/
        uses site-security; /* this is not used*/
        uses site-service; /* this is not used*/
        uses site-routing; /* this is used*/
        uses site-attachment-availability; /* this is not used*/
        uses access-vpn-policy; /* this is used*/

        description
         "Grouping for site network access
         top level cfg.";
    }

    /* Main blocks */

    container l3vpn-svc {
        container vpn-services {
            list vpn-svc {
                key vpn-id;

                uses vpn-svc-cfg; /*Not used*/

                description "
                    List of VPN services.";
            }
            description
             "top level container
             for the VPN services.";
        }

        container sites {
            list site {
                key site-id;

                leaf site-id {
                    type svc-id;
                }

                uses site-top-level-cfg; /*Will be used later*/
                uses operational-requirements-ops; /* Not used*/

                container site-network-accesses { /* this is used*/
                    list site-network-access {
                        key site-network-access-id;

                        leaf site-network-access-id {
                            type svc-id;
                        }
                        uses site-network-access-top-level-cfg;
                        /* this is used*/
                    }
                }
            }
        }
    }
}