module bbf-gbond {

    yang-version 1.1;

    namespace "urn:bbf:yang:bbf-gbond";

    prefix bbf-gbond;

    import iana-if-type {
      prefix ianaift;
    }
    import ietf-interfaces {
      prefix if;
    }
    import bbf-fastdsl {
      prefix bbf-fastdsl;
    }
    import bbf-yang-types {
      prefix bbf-yang;
    }

    organization
      "Broadband Forum <https://www.broadband-forum.org>
     Common YANG Work Area";

    contact
      "Comments or questions about this Broadband Forum YANG module
     should be directed to <mailto:help@broadband-forum.org>.

     Editor:      Ken Kerpez, ASSIA, Inc.

     Editor:      Joey Boyd, Adtran

     PS Leader:   Joey Boyd, Adtran

     WA Director: Sven Ooghe, Nokia

     WA Director: Joey Boyd, Adtran";

    description
      "This module contains a collection of YANG definitions for
     supporting the Broadband Forum requirements on bonding of
     physical interfaces as defined in ITU-T G.998.1, ITU-T G.998.2,
     ITU-T G.998.3 and BBF TR-159. As such, this module is specfic to
     access network equipment (e.g., BBF-specified Access Nodes and
     FTTdp DPUs).

     Copyright (c) 2016-2022 Broadband Forum

     Redistribution and use in source and binary forms, with or
     without modification, are permitted provided that the following
     conditions are met:

     1. Redistributions of source code must retain the above copyright
        notice, this list of conditions and the following disclaimer.

     2. Redistributions in binary form must reproduce the above
        copyright notice, this list of conditions and the following
        disclaimer in the documentation and/or other materials
        provided with the distribution.

     3. Neither the name of the copyright holder nor the names of its
        contributors may be used to endorse or promote products
        derived from this software without specific prior written
        permission.

     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
     CONTRIBUTORS \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES,
     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
     CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

     The above license is used as a license under copyright only.
     Please reference the Forum IPR Policy for patent licensing terms
     <https://www.broadband-forum.org/ipr-policy>.

     Any moral rights which are necessary to exercise under the above
     license grant are also deemed granted under this license.

     This version of this YANG module is part of TR-355a4; see
     the TR itself for full legal notices.";

    revision "2022-05-23" {
      description
        "Amendment 4.
       * Approval Date:    2022-05-23
       * Publication Date: 2022-05-23.";
      reference
        "TR-355a4: YANG Modules for FTTdp Management
        	    <https://www.broadband-forum.org/download/
        		   TR-355_Amendment-4.pdf>";

    }

    revision "2020-10-13" {
      description
        "Amendment 3.
       * Approval Date:    2020-10-13
       * Publication Date: 2020-10-13.";
      reference
        "TR-355a3: YANG Modules for FTTdp Management
        	    <https://www.broadband-forum.org/download/
        		   TR-355_Amendment-3.pdf>";

    }


    feature bonding-primary-interface {
      description
        "Indicates support for assigning one of the interfaces of the
       bonding group as the primary interface.";
    }

    feature bonding-group-statistics {
      description
        "Indicates support for statistics associated with a bonding
       group.";
    }

    feature bonding-group-performance {
      description
        "Indicates support for performance associated with a bonding
       group.";
    }

    feature bonding-group-performance-15min {
      if-feature bonding-group-performance;
      description
        "Indicates support for 15 minute interval performance statistics
       associated with a bonding group.";
    }

    feature bonding-group-performance-24hr {
      if-feature bonding-group-performance;
      description
        "Indicates support for 24 hour interval performance statistics
       associated with a bonding group.";
    }

    identity control-protocol {
      description
        "Bonding control protocol for a G.998.2 based bonding group.";
    }

    identity ghs {
      base control-protocol;
      description "G.hs based discovery.";
    }

    identity bacp {
      base control-protocol;
      description
        "Bonding Aggregation Control Protocol.";
    }

    typedef undefined {
      type enumeration {
        enum "undefined" {
          value 0;
          description
            "Indicates data is not yet configured or available for
           reporting.";
        }
      }
      description
        "Provides an enumeration for reporting data is undefined.";
    }

    typedef boolean-or-undefined {
      type union {
        type undefined;
        type boolean;
      }
      description
        "Boolean type which also provides a means of reporting that the
       value is undefined rather than true or false.";
    }

    typedef bonding-group-profile-ref {
      type leafref {
        path "/bbf-gbond:gbond/bbf-gbond:profiles/bbf-gbond:bonding-group/bbf-gbond:profile/bbf-gbond:name";
      }
      description
        "Used to reference a bonding group profile.";
    }

    typedef bonding-group-threshold-profile-ref {
      type leafref {
        path "/bbf-gbond:gbond/bbf-gbond:thresholds/bbf-gbond:bonding-group/bbf-gbond:threshold-profile/bbf-gbond:name";
      }
      description
        "Used to reference a line threshold profile.";
    }

    typedef bonding-group-threshold-template-ref {
      type leafref {
        path "/bbf-gbond:gbond/bbf-gbond:thresholds/bbf-gbond:bonding-group/bbf-gbond:threshold-template/bbf-gbond:name";
      }
      description
        "Used to reference a bonding group threshold template.";
    }

    container gbond {
      description "G.bond configuration.";
      container profiles {
        description "Profile configuration.";
        container bonding-group {
          description
            "Profile configuration specific to a bonding group.";
          list profile {
            key "name";
            description
              "Profile defining the bonding group configuration.";
            leaf name {
              type bbf-yang:string-ascii64;
              description
                "Uniquely identifies the configuration profile.";
            }

            leaf target-upstream-data-rate {
              type bbf-yang:data-rate32;
              default "4294967295";
              description
                "A desired maximum operating data rate of the Generic
               Bonded Sub-layer (GBS) in the upstream direction, in
               kilobits per second.";
              reference
                "TR-159 section 5.5.1.17, aGroupTargetUpRate.";

            }

            leaf target-downstream-data-rate {
              type bbf-yang:data-rate32;
              default "4294967295";
              description
                "A desired maximum operating data rate of the Generic
               Bonded Sub-layer (GBS) in the downstream direction, in
               kilobits per second.";
              reference
                "TR-159 section 5.5.1.18, aGroupTargetDownRate.";

            }

            leaf low-upstream-data-rate-threshold {
              type bbf-yang:data-rate32;
              default "0";
              description
                "A desired G.998.x port low upstream rate crossing alarm
               threshold, in kilobits per second.

               When the current value of upstream-data-rate for this
               port reaches/drops below or exceeds this threshold, a
               notification MAY be generated.

               A value of 0 effectively disables any notification.";
              reference
                "TR-159 section 5.5.1.21, aGroupThreshLowUpRate.";

            }

            leaf low-downstream-data-rate-threshold {
              type bbf-yang:data-rate32;
              default "0";
              description
                "A desired G.998.x port low downstream rate crossing
               alarm threshold, in kilobits per second.

               When the current value of downstream-data-rate for this
               port reaches/drops below or exceeds this threshold, a
               notification MAY be generated.

               A value of 0 effectively disables any notification.";
              reference
                "TR-159 section 5.5.1.22, aGroupThreshLowDownRate.";

            }
          }  // list profile
        }  // container bonding-group
      }  // container profiles

      container thresholds {
        description
          "Threshold configuration.";
        container bonding-group {
          if-feature bonding-group-performance;
          description
            "Threshold configuration specific to a bonding group.";
          list threshold-profile {
            key "name";
            description
              "Profile defining the threshold for bonding group specific
             performance parameters.";
            leaf name {
              type bbf-yang:string-ascii64;
              description
                "Uniquely identifies the bonding group threshold
               profile.";
            }

            leaf errored-seconds-threshold {
              type uint32;
              units "seconds";
              default "0";
              description
                "Threshold for the count of errored seconds (ES). A
               special value (0) indicates the threshold is
               disabled.";
            }

            leaf severely-errored-seconds-threshold {
              type uint32;
              units "seconds";
              default "0";
              description
                "Threshold for the count of severely errored seconds
               (SES). A special value (0) indicates the threshold is
               disabled.";
            }

            leaf unavailable-seconds-threshold {
              type uint32;
              units "seconds";
              default "0";
              description
                "Threshold for the count of unavailable seconds (UAS). A
               special value (0) indicates the threshold is
               disabled.";
            }
          }  // list threshold-profile

          list threshold-template {
            key "name";
            description
              "A template defining the threshold profiles to apply to
             performance parameters of a G.bond interface.";
            leaf name {
              type bbf-yang:string-ascii64;
              description
                "Uniquely identifies the line configuration vector.";
            }

            leaf gbs-c-15min-threshold-profile {
              if-feature bonding-group-performance-15min;
              type bonding-group-threshold-profile-ref;
              mandatory true;
              description
                "Reference to a line threshold profile for Generic
               Bonded Sub-layer, CO side (GBS-C) thresholds related to
               15 minute performance counters.";
            }

            leaf gbs-c-24hr-threshold-profile {
              if-feature bonding-group-performance-24hr;
              type bonding-group-threshold-profile-ref;
              mandatory true;
              description
                "Reference to a line threshold profile for Generic
               Bonded Sub-layer, CO side (GBS-C) thresholds related to
               24 hour performance counters.";
            }
          }  // list threshold-template
        }  // container bonding-group
      }  // container thresholds
    }  // container gbond

    augment /if:interfaces/if:interface {
      when
        "derived-from-or-self(if:type,'ianaift:g9981') or "
          + "derived-from-or-self(if:type,'ianaift:g9982') or "
          + "derived-from-or-self(if:type,'ianaift:g9983')" {
        description
          "Only applicable if the interface type is G.998.1, G.998.2,
         G.998.3, or derived from one of those types.";
      }
      description
        "Augment the basic interface configuration with parameters
       associated with a G.bond bonding group.";
      container bonding-group {
        presence
          "The presence of this container indicates that this interface
         is a bonding group representing a Generic Bonded Sub-layer
         interface per TR-159.";
        description
          "Configuration parameters associated with a bonding group.";
        leaf profile {
          type bonding-group-profile-ref;
          mandatory true;
          description
            "Assigns a profile to a bonding group.";
        }

        leaf threshold-template {
          if-feature bonding-group-performance;
          type bonding-group-threshold-template-ref;
          description
            "Assigns a threshold template to a bonding group. If no
           threshold template is assigned, threshold crossing alert
           (TCA) reporting for all thresholds is disabled.";
        }

        leaf bonded-interface-mode {
          type bbf-fastdsl:fastdsl-mode-ref;
          mandatory true;
          description
            "The intended FastDSL mode of operation for all lines
           associated with the bonded group.";
        }

        leaf-list lower-layer-if {
          type if:interface-ref;
          must
            "/if:interfaces/if:interface[if:name=current()]
              /if:type='ianaift:fastdsl' and
              /if:interfaces/if:interface[if:name=current()]
              /bbf-fastdsl:line/bbf-fastdsl:configured-mode=
              ../bonded-interface-mode" {
            error-message
              "Either the type of interface is not derived from or "
                + "equal to 'ianaift:fastdsl' or the interface is not of "
                + "the same configured mode as the bonded interface mode "
                + "for this group.";
            description
              "Each lower layer interface must be either a 'fastdsl'
             interface or an interface type derived from 'fastdsl'
             and must also be of the same configured mode as the
             overall bonded interface mode for the bonding group.";
          }
          min-elements 1;
          description
            "A reference to an interface representing a bonded channel
           entity.";
        }

        leaf primary-interface {
          if-feature bonding-primary-interface;
          type if:interface-ref;
          must
            'current() = current()/../lower-layer-if' {
            error-message
              "The primary interface must be an interface configured as"
                + " a lower layer interface of this bonding group.";
            description
              "The primary interface must be an interface configured as
             a lower layer interface of this bonding group.";
          }
          mandatory true;
          description
            "Mulitple protocols, such as ANCP and DHCPv4, define PDUs
           that contains an 'Access Loop Circuit Id' (the terminology
           is protocol dependent) which is to be generated by the
           Access Node and which identifies the position in the
           hardware where the line is physically connected to. When
           such identification is to be generated for a bonding group,
           then the issue is that this bonding group is composed of
           multiple physical lines. In that situation the leaf
           'primary-interface' identifies from which FastDSL line /
           interface / port the access loop identification will be
           generated.";
        }

        notification low-upstream-data-rate-crossing {
          description
            "This notification indicates that the G.998.x port upstream
           data rate has reached/dropped below or exceeded the low
           upstream rate threshold, specified by
           'low-upstream-data-rate-threshold'.

           This notification MAY be sent for the Generic Bonded
           Sub-layer, CO side (GBS-C) ports while the port is up, on
           the crossing event in both directions: from normal (rate is
           above the threshold) to low (rate equals the threshold or
           below it) and from low to normal. This notification is not
           applicable to the Generic Bonded Sub-layer, RT side (GBS-R)
           ports.

           Generation of this notification is controlled by the
           setting the 'low-upstream-data-rate-threshold' to 0.";
          reference
            "TR-159 section 5.5.1.24, nGroupLowUpRateCrossing";

          leaf event {
            type enumeration {
              enum "normal-to-low" {
                value 0;
                description
                  "G.998.x port upstream data rate has reached/dropped
                 below the low upstream rate threshold.";
              }
              enum "low-to-normal" {
                value 1;
                description
                  "G.998.x port upstream data rate has exceeded the
                 low upstream rate threshold.";
              }
            }
            description
              "The type of threshold crossing event that triggered the
             notification.";
          }
        }  // notification low-upstream-data-rate-crossing

        notification low-downstream-data-rate-crossing {
          description
            "This notification indicates that the G.998.x port
           downstream data rate has reached/dropped below or exceeded
           the low downstream rate threshold, specified by
           'low-downstream-data-rate-threshold'.

           This notification MAY be sent for the Generic Bonded
           Sub-layer, CO side (GBS-C) ports while the port is up, on
           the crossing event in both directions: from normal (rate is
           above the threshold) to low (rate equals the threshold or
           below it) and from low to normal. This notification is not
           applicable to the Generic Bonded Sub-layer, RT side (GBS-R)
           ports.

           Generation of this notification is controlled by the
           setting the 'low-downstream-data-rate-threshold' to 0.";
          reference
            "TR-159 section 5.5.1.25, nGroupLowDownRateCrossing";

          leaf event {
            type enumeration {
              enum "normal-to-low" {
                value 0;
                description
                  "G.998.x port downstream data rate has reached/dropped
                 below the low downstream rate threshold.";
              }
              enum "low-to-normal" {
                value 1;
                description
                  "G.998.x port downstream data rate has exceeded the
                 low downstream rate threshold.";
              }
            }
            description
              "The type of threshold crossing event that triggered the
             notification.";
          }
        }  // notification low-downstream-data-rate-crossing

        notification link-up {
          description
            "This notification indicates that the G.998.x interface has
           transitioned to an 'up' status, as specified by
           'oper-status'.";
          reference
            "TR-159 section 5.5.1.27, nGroupLinkUp";

        }  // notification link-up

        notification link-down {
          description
            "This notification indicates that the G.998.x interface has
           transitioned to an 'down' status, as specified by
           'oper-status'.";
          reference
            "TR-159 section 5.5.1.28, nGroupLinkDown";

        }  // notification link-down
      }  // container bonding-group
    }
  }  // module bbf-gbond