module ietf-pseudowires {
  namespace "urn:ietf:params:xml:ns:yang:ietf-pseudowires";
  prefix "pw";

  import ietf-inet-types {
    prefix "inet";
  }

  import ietf-routing-types {
    prefix "rt-types";
  }

  organization  "ietf";
  contact       "ietf";
  description   "Pseudowire YANG model";

  revision "2017-06-26" {
    description "Initial revision " +
                "  - Created a new model for pseudowires, which used " +
                "    to be defined within the L2VPN model " +
                "";
    reference   "";
  }

  /* Typedefs */

  typedef pseudowire-ref {
    type leafref {
      path "/pw:pseudowires/pw:pseudowire/pw:name";
    }
    description "A type that is a reference to a pseudowire";
  }

  typedef pw-template-ref {
    type leafref {
      path "/pw:pseudowires/pw:pw-templates/pw:pw-template/pw:name";
    }
    description "A type that is a reference to a pw-template";
  }

  typedef cw-negotiation-type {
    type enumeration {
      enum "non-preferred" {
        description "No preference for control-word";
      }
      enum "preferred" {
        description "Prefer to have control-word negotiation";
      }
    }
    description "control-word negotiation preference type";
  }

  typedef pseudowire-status-type {
    type bits {
      bit pseudowire-forwarding {
        position 0;
        description "Pseudowire is forwarding";
      }
      bit pseudowire-not-forwarding {
        position 1;
        description "Pseudowire is not forwarding";
      }
      bit local-attachment-circuit-receive-fault {
        position 2;
        description "Local attachment circuit (ingress) receive " +
                    "fault";
      }
      bit local-attachment-circuit-transmit-fault {
        position 3;
        description "Local attachment circuit (egress) transmit " +
                    "fault";
      }
      bit local-PSN-facing-PW-receive-fault {
        position 4;
        description "Local PSN-facing PW (ingress) receive fault";
      }
      bit local-PSN-facing-PW-transmit-fault {
        position 5;
        description "Local PSN-facing PW (egress) transmit fault";
      }
      bit PW-preferential-forwarding-status {
        position 6;
        description "Pseudowire preferential forwarding status";
      }
      bit PW-request-switchover-status {
        position 7;
        description "Pseudowire request switchover status";
      }
    }
    description
      "Pseudowire status type, as registered in the IANA " +
      "Pseudowire Status Code Registry";
  }

  /* Groupings */

  grouping pw-type-grp {
    description "pseudowire type grouping";
    choice pw-type {
      description "A choice of pseudowire type";
      case ldp-or-static-pw {
        leaf peer-ip {
          type inet:ip-address;
          description "peer IP address";
        }
        leaf pw-id {
          type uint32;
          description "pseudowire id";
        }
        leaf icb {
          type boolean;
          description "inter-chassis backup";
        }
        leaf transmit-label {
          type rt-types:mpls-label;
          description "transmit lable";
        }
        leaf receive-label {
          type rt-types:mpls-label;
          description "receive label";
        }
      }
      case bgp-pw {
        leaf remote-pe-id {
          type inet:ip-address;
          description "remote pe id";
        }
      }
      case bgp-ad-pw {
        leaf remote-ve-id {
          type uint16;
          description "remote ve id";
        }
      }
    }
  }

  /* Data */

  container pseudowires {
    description "Configuration management of pseudowires";
    list pseudowire {
      key "name";
      description "A pseudowire";
      leaf name {
        type string;
        description "pseudowire name";
      }
      leaf state {
        type pseudowire-status-type;
        config false;
        description "pseudowire operation status";
        reference "RFC 4446 and IANA Pseudowire Status Codes " +
                  "Registery";
      }
      leaf template {
        type pw-template-ref;
        description "pseudowire template";
      }
      leaf mtu {
        type uint16;
        description "PW MTU";
      }
      leaf mac-withdraw {
        type boolean;
        default false;
        description "Enable (true) or disable (false) MAC withdraw";
      }
      leaf cw-negotiation {
        type cw-negotiation-type;
        description "cw-negotiation";
      }
      leaf tunnel-policy {
        type string;
        description "tunnel policy name";
      }
      choice pw-type {
        description "A choice of pseudowire type";
        case configured-pw {
          container configured-pw {
            description "LDP or static pseudowire that requires " +
                        "manual configuration";
            leaf peer-ip {
              type inet:ip-address;
              description "peer IP address";
            }
            leaf pw-id {
              type uint32;
              description "pseudowire id";
            }
            leaf icb {
              type boolean;
              description "inter-chassis backup";
            }
            leaf transmit-label {
              type rt-types:mpls-label;
              description "transmit lable";
            }
            leaf receive-label {
              type rt-types:mpls-label;
              description "receive label";
            }
          }
        }
      }
    }
    container pw-templates {
      description "pw-templates";
      list pw-template {
        key "name";
        description "pw-template";
        leaf name {
          type string;
          description "name";
        }
        leaf mtu {
          type uint16;
          description "pseudowire mtu";
        }
        leaf cw-negotiation {
          type cw-negotiation-type;
          default "preferred";
          description
            "control-word negotiation preference";
        }
        leaf tunnel-policy {
          type string;
          description "tunnel policy name";
        }
      }
    }
  }
}