module ietf-te-topology-sf-state {

    yang-version 1;

    namespace
      "urn:ietf:params:xml:ns:yang:ietf-te-topology-sf-state";

    prefix tet-sf-s;

    import ietf-te-topology-sf {
      prefix tet-sf;
    }
    import ietf-network-state {
      prefix nd-s;
    }
    import ietf-network-topology-state {
      prefix lnk-s;
    }
    import ietf-te-topology-state {
      prefix tet-s;
    }

    organization
      "Traffic Engineering Architecture and Signaling (TEAS)
     Working Group";

    contact
      "WG Web:   <http://tools.ietf.org/wg/teas/>
     WG List:  <mailto:teas@ietf.org>

     WG Chair: Lou Berger
               <mailto:lberger@labn.net>

     WG Chair: Vishnu Pavan Beeram
               <mailto:vbeeram@juniper.net>

     Editors:  Igor Bryskin
               <mailto:Igor.Bryskin@huawei.com>

               Xufeng Liu
               <mailto:Xufeng_Liu@jabil.com>";

    description "SF aware TE topology model";

    revision "2017-10-22" {
      description "Initial revision";
      reference
        "TBD";

    }


    augment /nd-s:networks/nd-s:network/nd-s:network-types/tet-s:te-topology {
      description
        "Defines the SF aware TE topology type.";
      uses tet-sf:sf-topology-type;
    }

    augment /nd-s:networks/nd-s:network/nd-s:node/tet-s:te/tet-s:te-node-attributes {
      description
        "Parameters for SF aware TE topology.";
      uses tet-sf:service-function-node-augmentation;
    }

    augment /nd-s:networks/nd-s:network/nd-s:node/tet-s:te/tet-s:information-source-entry {
      description
        "Parameters for SF aware TE topology.";
      uses tet-sf:service-function-node-augmentation;
    }

    augment /nd-s:networks/nd-s:network/nd-s:node/tet-s:te/tet-s:tunnel-termination-point {
      description
        "Parameters for SF aware TE topology.";
      uses tet-sf:service-function-ttp-augmentation;
    }

    augment /nd-s:networks/nd-s:network/nd-s:node/tet-s:te/tet-s:te-node-attributes/tet-sf-s:service-function/tet-sf-s:link-terminations/tet-sf-s:link-termination/tet-sf-s:from {
      description
        "Add reference to the link termination point.
       This portion cannot be shared with the state module.";
      leaf tp-ref {
        type leafref {
          path "../../../../../../../lnk-s:termination-point/lnk-s:tp-id";
        }
        description
          "Reference to the link termination point.";
      }
    }
  }  // module ietf-te-topology-sf-state