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module ietf-eth-tran-service {

  namespace "urn:ietf:params:xml:ns:yang:ietf-eth-tran-service";

  prefix "ethtsvc";

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

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

  import ietf-eth-tran-types {
    prefix "etht-types";
  }

        organization
                "Internet Engineering Task Force (IETF) CCAMP WG";
  contact
    "
      WG List: <mailto:ccamp@ietf.org>
      ID-draft editor:
        Haomian Zheng (zhenghaomian@huawei.com);
        Italo Busi (italo.busi@huawei.com);
        Aihua Guo (aihuaguo@huawei.com);
        Yunbin Xu (xuyunbin@ritt.cn);
        Yang Zhao (zhaoyangyjy@chinamobile.com);
        Xufeng Liu (Xufeng_Liu@jabil.com);
        Giuseppe Fioccola (giuseppe.fioccola@telecomitalia.it);
    ";

  description
    "This module defines a YANG data model for describing
     the Ethernet transport services.";

        revision 2018-03-01 {
                description
                        "Initial revision";
                reference
                        "draft-zheng-ccamp-client-signal-yang";
        }

  /*
  Groupings
  */

  grouping vlan-classification {
    description
      "A grouping which represents classification on an 802.1Q VLAN tag.";

    leaf tag-type {
      type etht-types:eth-tag-classify;
      description
        "The tag type used for VLAN classification.";
    }
    choice individual-bundling-vlan {
      description
        "VLAN based classification can be individual
         or bundling.";
      case individual-vlan {
        leaf vlan-value {
          type etht-types:vlanid;
          description
            "VLAN ID value.";
        }
      }

      case vlan-bundling {
        leaf vlan-range {
          type etht-types:vid-range-type;
          description
            "List of VLAN ID values.";
        }
      }
    }
  }

  grouping vlan-write {
    description
      "A grouping which represents push/pop operations
       of an 802.1Q VLAN tag.";

    leaf tag-type {
      type etht-types:eth-tag-type;
      description
        "The VLAN tag type to push/swap.";
    }
    leaf vlan-value {
      type etht-types:vlanid;
      description
        "The VLAN ID value to push/swap.";
    }
  }

  grouping vlan-operations {
    description
      "A grouping which represents VLAN operations.";

      leaf pop-tags {
      type uint8 {
        range "1..2";
      }
      description
        "The number of VLAN tags to pop (or swap if used in
         conjunction with push-tags)";
    }
    container push-tags {
      description
        "The VLAN tags to push (or swap if used in
         conjunction with pop-tags)";

      container outer-tag {
        presence
          "Indicates existence of the outermost VLAN tag to
           push/swap";

        description
          "The outermost VLAN tag to push/swap.";

        uses vlan-write;
      }
      container second-tag {
        must
                                        '../outer-tag/tag-type = "s-vlan-tag-type" and ' +
                                        'tag-type = "c-vlan-tag-type"'
        {

          error-message
            "
              When pushing/swapping two tags, the outermost tag must
              be specified and of S-VLAN type and the second
              outermost tag must be of C-VLAN tag type.
            ";
          description
            "
              For IEEE 802.1Q interoperability, when pushing/swapping
              two tags, it is required that the outermost tag exists
              and is an S-VLAN, and the second outermost tag is a
              C-VLAN.
            ";
        }

        presence
          "Indicates existence of a second outermost VLAN tag to
           push/swap";

        description
          "The second outermost VLAN tag to push/swap.";

        uses vlan-write;
      }
    }
  }

  grouping bandwidth-profiles {
    description
      "A grouping which represent bandwidth profile configuration.";

    choice direction {
      description
        "Whether the bandwidth profiles are symmetrical or
         asymmetrical";
      case symmetrical {
        description
          "The same bandwidth profile is used to describe the ingress
          and the egress bandwidth profile.";

        leaf ingress-egress-bandwidth-profile-name {
          type "string";
          description
            "Name of the bandwidth profile.";
        }
      }
      case asymmetrical {
        description
          "Ingress and egress bandwidth profiles can be specified.";
        leaf ingress-bandwidth-profile-name {
          type "string";
          description
            "Name of the bandwidth profile used in
             the ingress direction.";
        }
        leaf egress-bandwidth-profile-name {
          type "string";
          description
            "Name of the bandwidth profile used in
             the egress direction.";
        }
      }
    }
  }

  grouping etht-svc-access-parameters {
    description
      "ETH transport services access parameters";

    leaf access-node-id {
      type te-types:te-node-id;
      description
        "The identifier of the access node in
         the ETH transport topology.";
    }
    leaf access-ltp-id {
      type te-types:te-tp-id;
      description
        "The TE link termination point identifier, used
         together with access-node-id to identify the
         access LTP.";
    }
    leaf service-classification-type {
      type identityref {
        base etht-types:service-classification-type;
      }
      description
        "Service classification type.";
    }

    choice service-classification {
      description
        "Access classification can be port-based or
         VLAN based.";

      case port-classification {
        /* no additional information */
      }

      case vlan-classification {
        container outer-tag {
          presence "The outermost VLAN tag exists";
          description
            "Classifies traffic using the outermost VLAN tag.";

          uses vlan-classification;
        }
        container second-tag {
          must
                                                '../outer-tag/tag-type = "classify-s-vlan" and ' +
                                                'tag-type = "classify-c-vlan"'
          {

            error-message
              "
                When matching two tags, the outermost tag must be
                specified and of S-VLAN type and the second
                outermost tag must be of C-VLAN tag type.
              ";
            description
              "
                For IEEE 802.1Q interoperability, when matching two
                tags, it is required that the outermost tag exists
                and is an S-VLAN, and the second outermost tag is a
                C-VLAN.
              ";
          }
          presence "The second outermost VLAN tag exists";

          description
            "Classifies traffic using the second outermost VLAN tag.";

          uses vlan-classification;
        }
      }
    }

/*
        Open issue: can we constraints it to be used only with mp services?
*/
                leaf split-horizon-group {
                        type string;
                        description "Identify a split horizon group";
                }

    uses bandwidth-profiles;

    container vlan-operations {
        description
          "include parameters for vlan-operation";
      choice direction {
        description
          "Whether the VLAN operations are symmetrical or
           asymmetrical";
        case symmetrical {
          container symmetrical-operation {
            uses vlan-operations;
            description
              "Symmetrical operations.
               Expressed in the ingress direction, but
               the reverse operation is applied to egress traffic";
          }
        }
        case asymmetrical {
          container asymmetrical-operation {
            description "Asymmetrical operations";
            container ingress {
              uses vlan-operations;
              description "Ingress operations";
            }
            container egress {
              uses vlan-operations;
              description "Egress operations";
            }
          }
        }
      }
    }
  }

  grouping etht-svc-tunnel-parameters {
    description
      "ETH transport services tunnel parameters";

    leaf tunnel-name {
      type string;
      description
        "TE service tunnel instance name.";
    }
    choice svc-multiplexing-tag {
      description
        "Service multiplexing is optional and flexible.";

      case other {
        /*
         placeholder to support proprietary multiplexing
         (for further discussion)
        */
                        }

      case none {
        /* no additional information is needed */
                        }

      case vlan-tag {
        /*
          No additional information is needed
          The C-Tag or S-Tag used for service mulitplexing is defined
          by the VLAN classification and operations configured in the
          etht-svc-access-parameters grouping
        */
                        }

      case pw {
        /* to be completed (for further discussion) */
                        }
    }

/*
        Open issue: can we constraints it to be used only with mp services?
*/
                leaf src-split-horizon-group {
                        type string;
                        description "Identify a split horizon group at the Tunnel source TTP";
                }
                leaf dst-split-horizon-group {
                        type string;
                        description "Identify a split horizon group at the Tunnel destination TTP";
                }
  }

  grouping te-topology-identifier {
                description
        "An identifier to uniquely identify the TE topology.";
    leaf access-provider-id {
      type te-types:te-global-id;
      description
        "An identifier to uniquely identify a provider.";
    }
    leaf access-client-id {
      type te-types:te-global-id;
      description
        "An identifier to uniquely identify a client.";
    }
    leaf access-topology-id {
      type te-types:te-topology-id;
      description
        "Identifies the topology the
        service access ports belong to.";
    }
  }

        grouping  etht-svc-pm-threshold_config {
                description
                        "Configuraiton parameters for Ethernet service PM thresholds.";

                leaf sending-rate-high {
                        type uint64;
                        description
                                "High threshold of packet sending rate in kbps.";
                }
                leaf sending-rate-low {
                        type uint64;
                        description
                                "Low threshold of packet sending rate in kbps.";
                }
                leaf receiving-rate-high {
                        type uint64;
                        description
                                "High threshold of packet receiving rate in kbps.";
                }
                leaf receiving-rate-low {
                        type uint64;
                        description
                                "Low threshold of packet receiving rate in kbps.";
                }
        }

        grouping  etht-svc-pm-stats {
                description
                        "Ethernet service PM statistics.";

                leaf sending-rate-too-high {
                        type uint32;
                        description
                                "Counter that indicates the number of times the sending rate is above the high threshold";
                }
                leaf sending-rate-too-low {
                        type uint32;
                        description
                                "Counter that indicates the number of times the sending rate is below the low threshold";
                }
                leaf receiving-rate-too-high {
                        type uint32;
                        description
                                "Counter that indicates the number of times the receiving rate is above the high threshold";
                }
                leaf receiving-rate-too-low {
                        type uint32;
                        description
                                "Counter that indicates the number of times the receiving rate is below the low threshold";
                }
        }

  grouping  etht-svc-instance_config {
    description
      "Configuraiton parameters for Ethernet services.";

    leaf etht-svc-name {
      type string;
      description
        "Name of the p2p ETH transport service.";
    }

                leaf etht-svc-descr {
                        type string;
                        description
                                "Description of the ETH transport service.";
                }

                leaf etht-svc-type {
                        type etht-types:service-type;
                        description
                                "Type of Ethernet service (p2p, mp2mp or rmp).";
                        /* Add default as p2p */
                }

                uses te-topology-identifier;

    list etht-svc-access-ports {
      key access-port-id;
      min-elements "1";
/*
        Open Issue:
                Is it possible to limit the max-elements only for p2p services?
                        max-elements "2";
*/
      description
        "List of the ETH trasport services access port instances.";

      leaf access-port-id {
        type uint16;
        description
          "ID of the service access port instance";
      }
        uses etht-svc-access-parameters;
    }
    list etht-svc-tunnels {
      key tunnel-name;
      description
        "List of the TE Tunnels supporting the ETH
        transport service.";

      uses etht-svc-tunnel-parameters;
    }
                container pm-config {
                        description
                                "ETH service performance monitoring";

                        leaf pm-enable {
                                type boolean;
                                description
                                        "Boolean value indicating whether PM is enabled.";
                        }
                        uses etht-svc-pm-threshold_config;
                }
    leaf admin-status {
      type identityref {
        base te-types:tunnel-state-type;
      }
      default te-types:tunnel-state-up;
      description "ETH service administrative state.";
    }
        }

  grouping  etht-svc-instance_state {
    description
      "State parameters for Ethernet services.";

    leaf operational-state {
          type identityref {
        base te-types:tunnel-state-type;
      }
      default te-types:tunnel-state-up;
          description "ETH service operational state.";
    }
    leaf provisioning-state {
      type identityref {
        base te-types:lsp-state-type;
      }
      description "ETH service provisioning state.";
    }
                leaf creation-time {
                        type yang:date-and-time;
                        description
                                "Time of ETH service creation.";
                }
                leaf last-updated-time {
                        type yang:date-and-time;
                        description
                                "Time of ETH service last update.";
                }
                uses etht-svc-pm-stats;
  }

  /*
  Data nodes
  */

  container etht-svc {
    description
      "ETH transport services.";

    container globals {
      description
      "ETH profile information.";
      list etht-svc-bandwidth-profiles {
        key bandwidth-profile-name;
        description
          "List of bandwidth profile templates used by
           Ethernet services.";

        uses etht-types:etht-bandwidth-profiles;
      }
    }

    list etht-svc-instances {
      key etht-svc-name;
      description
        "The list of p2p ETH transport service instances";

      uses etht-svc-instance_config;

      container state {
        config false;
        description
          "Ethernet Service states.";

        uses etht-svc-instance_state;
      }
    }
  }
}