submodule bbf-l2-forwarding-forwarders {

    yang-version 1.1;

    belongs-to bbf-l2-forwarding {
        prefix bbf-l2-fwd;
    }

    import bbf-yang-types {
      prefix bbf-yang;
    }
    import bbf-if-type {
      prefix bbfift;
    }
    import ietf-interfaces {
      prefix if;
    }

    include bbf-l2-forwarding-base;

    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:      Nick Hancock, Adtran

     Editor:      Ludwig Pauwels, Nokia

     PS Leader:   Joey Boyd, Adtran

     WA Director: Joey Boyd, Adtran

     WA Director: Sven Ooghe, Nokia";

    description
      "This submodule contains a collection of YANG definitions for
     managing forwarders.

     Copyright (c) 2017-2023, 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-383a6; see
     the TR itself for full legal notices.";

    revision "2023-03-07" {
      description
        "Amendment 6.
       * Approval Date:    2023-03-07.
       * Publication Date: 2023-03-07.";
      reference
        "TR-383a6: Common YANG Modules
        	  <https://www.broadband-forum.org/technical/download/
        		   TR-383_Amendment-6.pdf>";

    }

    revision "2022-03-01" {
      description
        "Amendment 5.
       * Approval Date:    2022-03-01.
       * Publication Date: 2022-03-01.";
      reference
        "TR-383a5: Common YANG Modules
        	  <https://www.broadband-forum.org/technical/download/
        		   TR-383_Amendment-5.pdf>";

    }

    revision "2020-10-13" {
      description
        "Amendment 3.
       * Approval Date:    2020-10-13.
       * Publication Date: 2020-10-13.";
      reference
        "TR-383a3: Common YANG Modules
        	  <https://www.broadband-forum.org/technical/download/
        		   TR-383_Amendment-3.pdf>";

    }

    revision "2018-12-03" {
      description
        "Amendment 2.
       * Approval Date:    2018-12-03.
       * Publication Date: 2018-12-03.";
      reference
        "TR-383a2: Common YANG Modules
        	<https://www.broadband-forum.org/technical/download/
        		 TR-383_Amendment-2.pdf>";

    }

    revision "2018-07-13" {
      description
        "Amendment 1.
       * Approval Date:    2018-06-04.
       * Publication Date: see revision date above.";
      reference
        "TR-383: Common YANG Modules
        	<https://www.broadband-forum.org/technical/download/
        		 TR-383_Amendment-1.pdf>";

    }

    revision "2017-05-08" {
      description
        "Initial revision.
       * Approval Date:    see revision date above.
       * Publication Date: 2017-06-02.";
      reference
        "TR-383: Common YANG Modules
        	<https://www.broadband-forum.org/technical/download/
        		 TR-383.pdf>";

    }


    feature forwarder-port-groups {
      description
        "Indicates support for a grouping of forwarder ports.";
    }

    typedef forwarder-ref {
      type leafref {
        path "/bbf-l2-fwd:forwarding/bbf-l2-fwd:forwarders/bbf-l2-fwd:forwarder/bbf-l2-fwd:name";
      }
      description
        "This type is used by data models that need to reference
       configured forwarders.";
    }

    typedef forwarder-state-ref {
      type leafref {
        path "/bbf-l2-fwd:forwarding-state/bbf-l2-fwd:forwarders/bbf-l2-fwd:forwarder/bbf-l2-fwd:name";
      }
      description
        "This type is used by data models that need to reference
       operational forwarders.";
    }

    grouping forwarder-port {
      description
        "This grouping is use by data models that need to reference
       configured forwarder ports.";
      leaf forwarder {
        type forwarder-ref;
        description
          "This leaf references a forwarder.";
      }

      leaf port {
        type leafref {
          path
            "/bbf-l2-fwd:forwarding/bbf-l2-fwd:forwarders/bbf-l2-"
              + "fwd:forwarder[bbf-l2-fwd:name = current()/../"
              + "forwarder]/bbf-l2-fwd:ports/bbf-l2-fwd:port/bbf-l2-"
              + "fwd:name";
        }
        description
          "This leaf references a port within the forwarder identified
         by the leaf 'forwarder'.";
      }
    }  // grouping forwarder-port

    grouping forwarder-port-state {
      description
        "This grouping is use by data models that need to reference
       operational forwarder ports.";
      leaf forwarder {
        type forwarder-state-ref;
        description
          "This leaf references a forwarder.";
      }

      leaf port {
        type leafref {
          path
            "/bbf-l2-fwd:forwarding-state/bbf-l2-fwd:forwarders/"
              + "bbf-l2-fwd:forwarder[bbf-l2-fwd:name = current()/../"
              + "forwarder]/bbf-l2-fwd:ports/bbf-l2-fwd:port/bbf-l2-"
              + "fwd:name";
        }
        description
          "This leaf references a port within the forwarder identified
         by the leaf 'forwarder'.";
      }
    }  // grouping forwarder-port-state

    grouping forwarder-port-group {
      description
        "This grouping is use by data models that need to reference
       configured forwarder port-groups.";
      leaf forwarder {
        type forwarder-ref;
        description
          "This leaf references a forwarder.";
      }

      leaf group {
        type leafref {
          path
            "/bbf-l2-fwd:forwarding/bbf-l2-fwd:forwarders/bbf-l2-"
              + "fwd:forwarder[bbf-l2-fwd:name = current()/../"
              + "forwarder]/bbf-l2-fwd:port-groups/bbf-l2-fwd:port-"
              + "group/bbf-l2-fwd:name";
        }
        description
          "This leaf references a port-group within the forwarder
         identified by the leaf 'forwarder'.";
      }
    }  // grouping forwarder-port-group

    augment /bbf-l2-fwd:forwarding {
      description
        "Augment the configuration nodes associated with layer 2
       forwarding with forwarder data nodes.";
      container forwarders {
        description
          "A forwarder is used to forward traffic between interfaces.";
        list forwarder {
          key "name";
          description
            "A list of forwarders.";
          leaf name {
            type bbf-yang:string-ascii64;
            description
              "The name of the forwarder.";
          }

          container ports {
            description
              "Configuration for ports associated with this forwarder.";
            list port {
              key "name";
              description
                "The list of ports associated with this forwarder.";
              leaf name {
                type bbf-yang:string-ascii64;
                description
                  "The name of the forwarder port.";
              }

              leaf sub-interface {
                type if:interface-ref;
                must
                  "derived-from-or-self(
                    /if:interfaces/if:interface[if:name = current()]
                    /if:type, 'bbfift:vlan-sub-interface') or
                    derived-from-or-self(
                    /if:interfaces/if:interface[if:name = current()]
                    /if:type, 'bbfift:l2-termination')" {
                  error-message
                    "The type of the interface being referenced is not "
                      + "a 'vlan-sub-interface', nor a 'l2-termination',  "
                      + "nor is it derived from one of them.";
                  description
                    "The type of interface being referenced MUST either
                   be a 'vlan-sub-interface', 'l2-termination' or a
                   derivation of either type.";
                }
                must
                  "count(/bbf-l2-fwd:forwarding
                          /bbf-l2-fwd:forwarders
                          /bbf-l2-fwd:forwarder
                          /bbf-l2-fwd:ports/bbf-l2-fwd:port
                          [bbf-l2-fwd:sub-interface
                           = current()])< 2" {
                  error-message
                    "Two forwarder ports, possibly from different "
                      + "forwarders, refer to the same sub-interface.";
                  description
                    "No two forwarder ports can refer to the same
                   sub-interface.";
                }
                description
                  "The VLAN sub-interface or layer 2 termination
                 associated with this port.";
              }
            }  // list port
          }  // container ports

          container port-groups {
            if-feature forwarder-port-groups;
            description
              "A group of ports associated with this forwarder that
             have common forwarding characteristics.";
            list port-group {
              key "name";
              description
                "A list of port groups";
              leaf name {
                type bbf-yang:string-ascii64;
                description
                  "The name of the group.";
              }

              leaf-list port {
                type leafref {
                  path
                    "../../../bbf-l2-fwd:ports/bbf-l2-fwd:port/"
                      + "bbf-l2-fwd:name";
                }
                description
                  "A grouping of ports associated with this forwarder.";
              }
            }  // list port-group
          }  // container port-groups
        }  // list forwarder
      }  // container forwarders
    }

    augment /bbf-l2-fwd:forwarding-state {
      description
        "Augment the state data nodes associated with layer 2
       forwarding with forwarder data nodes.";
      container forwarders {
        description
          "A forwarder is used to forward traffic between interfaces.";
        list forwarder {
          key "name";
          description
            "A list of forwarders.";
          leaf name {
            type bbf-yang:string-ascii64;
            description
              "The name of the forwarder.";
          }

          container ports {
            description
              "Configuration for ports associated with this forwarder.";
            list port {
              key "name";
              description
                "The list of ports associated with this forwarder.";
              leaf name {
                type bbf-yang:string-ascii64;
                description
                  "The name of the forwarder port.";
              }

              leaf sub-interface {
                type if:interface-state-ref;
                must
                  "derived-from-or-self(/if:interfaces-state"
                    + "/if:interface[if:name = current()]/if:type,"
                    + "'bbfift:vlan-sub-interface' ) or "
                    + "derived-from-or-self( /if:interfaces-state"
                    + "/if:interface[if:name = current()]/if:type,"
                    + "'bbfift:l2-termination')" {
                  description
                    "The type of interface being referenced must be a
                   VLAN sub-interface or a Layer 2 termination.";
                }
                description
                  "The VLAN sub-interface or Layer 2 termination
                 associated with this port.";
              }
            }  // list port
          }  // container ports
        }  // list forwarder
      }  // container forwarders
    }
  }  // submodule bbf-l2-forwarding-forwarders