module ietf-sr-topology {
  yang-version 1.1;
  namespace "urn:ietf:params:xml:ns:yang:ietf-sr-topology";
  prefix "srt";

  import ietf-network {
    prefix "nw";
  }
  import ietf-network-topology {
    prefix "nt";
  }
  import ietf-l3-unicast-topology {
    prefix "l3t";
  }
  import ietf-segment-routing-common {
    prefix "sr-cmn";
  }

  organization "TBD";
  contact "TBD";
  description "L3 TE Topology model";

  revision 2017-10-30 {
    description "Initial revision";
    reference "TBD";
  }

  grouping sr-topology-type {
    description
      "Identifies the SR topology type.";
    container sr {
      presence "Indiates SR Topology";
      description
        "Its presence identifies the SR topology type.";
    }
  }

  augment "/nw:networks/nw:network/nw:network-types/"
    + "l3t:l3-unicast-topology" {
    description
      "Defines the SR topology type.";
    uses sr-topology-type;
  }

  augment "/nw:networks/nw:network/l3t:l3-topology-attributes" {
    when "../nw:network-types/l3t:l3-unicast-topology/sr" {
      description "Augment only for SR topology.";
    }
    description "Augment topology configuration";
    uses sr-topology-attributes;
  }

  augment "/nw:networks/nw:network/nw:node/l3t:l3-node-attributes" {
    when "../../nw:network-types/l3t:l3-unicast-topology/sr" {
      description "Augment only for SR topology.";
    }
    description "Augment node configuration.";
    uses sr-node-attributes;
  }

  augment "/nw:networks/nw:network/nw:node/l3t:l3-node-attributes"
    + "/l3t:prefix" {
    when "../../../nw:network-types/l3t:l3-unicast-topology/sr" {
      description "Augment only for SR topology.";
    }
    description "Augment node prefix.";
    uses sr-node-prefix-attributes;
  }

  augment "/nw:networks/nw:network/nw:node/nt:termination-point/"
    + "l3t:l3-termination-point-attributes" {
    when "../../../nw:network-types/l3t:l3-unicast-topology/"
      + "sr" {
      description "Augment only for SR topology.";
    }
    description "Augment termination point configuration";
    uses sr-tp-attributes;
  }

  augment "/nw:networks/nw:network/nt:link/l3t:l3-link-attributes" {
    when "../../nw:network-types/l3t:l3-unicast-topology/sr" {
      description "Augment only for SR topology.";
    }
    description "Augment link configuration.";
    uses sr-link-attributes;
  }

  grouping sr-topology-attributes {
    description "SR topology scope attributes.";
    container sr {
      description
        "Containing SR attributes.";
      uses sr-cmn:srgb-cfg;
    } // sr
  } // sr-topology-attributes

  grouping information-source-attributes {
    description
      "The attributes identifying source that has provided the
       related information, and the source credibility.";
    leaf information-source {
      type enumeration {
        enum "unknown" {
          description "The source is unknown.";
        }
        enum "locally-configured" {
          description "Configured entity.";
        }
        enum "ospfv2" {
          description "OSPFv2.";
        }
        enum "ospfv3" {
          description "OSPFv3.";
        }
        enum "isis" {
          description "ISIS.";
        }
        enum "system-processed" {
          description "System processed entity.";
        }
        enum "other" {
          description "Other source.";
        }
      }
      config false;
      description
        "Indicates the source of the information.";
    }
    container information-source-state {
      config false;
      description
        "The container contains state attributes related to
         the information source.";
      leaf credibility-preference {
        type uint16;
        description
          "The preference value to calculate the traffic
           engineering database credibility value used for
           tie-break selection between different
           information-source values.
           Higher value is more preferable.";
      }
    }
  } // information-source-attributes

  grouping sr-node-attributes {
    description "SR node scope attributes.";
    container sr {
      description
        "Containing SR attributes.";
      uses sr-cmn:srgb-cfg;
      uses sr-cmn:srlb-cfg;
      uses sr-cmn:node-capabilities;
      // Operational state data
      uses information-source-attributes;
    } // sr
  } // sr-node-attributes

  grouping sr-node-prefix-attributes {
    description "Containing SR attributes for a prefix.";
    container sr {
      presence "Presence indicates SR is enabled.";
      description
        "Containing SR attributes for a prefix.";
      uses sr-cmn:prefix-sid-attributes;
      uses sr-cmn:last-hop-behavior;
      leaf is-local {
        type boolean;
        description
          "'true' if the SID is local.";
      }
    } // sr
  } // sr-node-prefix-attributes

  grouping sr-tp-attributes {
    description "SR termination point scope attributes";
  } // sr-tp-attributes

  grouping sr-link-attributes {
    description "SR link scope attributes";
    container sr {
      description
        "Containing SR attributes.";
      leaf sid {
        type uint32;
        description
          "SID.";
      }
      uses sr-cmn:sid-value-type;
      leaf is-local {
        type boolean;
        description
          "'true' if the SID is local.";
      }
      leaf is-part-of-set {
        type boolean;
        config false;
        description
          "'true' if the SID is part of a set.";
      }
      leaf is-on-lan {
        type boolean;
        config false;
        description
          "'true' if on a lan.";
      }
      uses information-source-attributes;
    } // sr
  } // sr-link-attributes
}