module bbf-l2-dhcpv4-relay-forwarding {

    yang-version 1.1;

    namespace
      "urn:bbf:yang:bbf-l2-dhcpv4-relay-forwarding";

    prefix bbf-l2-d4r-fwd;

    import bbf-l2-forwarding {
      prefix bbf-l2-fwd;
    }

    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 module contains a collection of YANG definitions for
     supporting the Broadband Forum requirements on subscriber
     management via the DHCPv4 protocol as applicable to access
     network equipment. As such, this module is specific to access
     network equipment (e.g., BBF-specified Access Nodes and FTTdp
     DPUs).

     Specifically, this module augments bbf-l2-forwarding with
     subscriber management via the DHCPv4 protocol.

     Copyright (c) 2017-2022, 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-383a5; see
     the TR itself for full legal notices.";

    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 "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>";

    }


    augment /bbf-l2-fwd:forwarding/bbf-l2-fwd:forwarders/bbf-l2-fwd:forwarder {
      description
        "Additions for L2 DHCPv4 Relay Agent at the forwarder level.";
      container l2-dhcpv4-relay {
        presence
          "Presence of this container indicates L2 DHCPv4 Relay Agent
         functionality is supported in the context of this
         forwarder.";
        description
          "L2 DHCPv4 Relay Agent related controls.";
        leaf downstream-broadcast-flooding {
          type union {
            type boolean;
            type enumeration {
              enum "apply-layer2-forwarding" {
                value 0;
                description
                  "Downstream broadcast DHCP messages are forwarded
                 according forwarding rules configured for the
                 forwarder. Especially applicable to the forwarding of
                 DHCP broadcast messages is the configuration of
                 flooding rules for broadcast frames.";
              }
              enum
                "single-user-with-fallback-to-layer2" {
                value 1;
                description
                  "Downstream broadcast DHCP messages are first
                 processed as defined for the value 'false', i.e. they
                 are forwarded to only one port of the forwarder which
                 is identified by the DHCP message content. If however
                 no port is identified in this way, then the message
                 will be processed as identified in 'apply-layer2-
                 forwarding', i.e. based on the (flooding) forwarding
                 rules of the forwarder.";
              }
            }
          }
          default "false";
          description
            "If it is configured as 'true', the L2 DHCP Relay Agent will
           flood downstream 'broadcast DHCPv4 messages' to all output
           ports of the forwarder.

           If it is configured as 'false', the L2 DHCP Relay Agent
           will forward downstream 'broadcast DHCPv4 messages' to only
           one port of the forwarder, i.e. the one for which the
           message is intended. Identifying the port for which the
           message is intended is based on frame content.

           If it is configured with one of the enum values, then the
           L2 DHCP Relay Agent will forward downstream 'broadcast
           DHCPv4 messages' as defined in the description of the enum
           value.";
        }
      }  // container l2-dhcpv4-relay
    }
  }  // module bbf-l2-dhcpv4-relay-forwarding