message Host {
   optional UUID id = 1;
   optional string name = 2;
   repeated IPAddress addresses = 3;

   message PortBinding {
       optional UUID port_id = 1;
       optional string interface_name = 2;
   }
   repeated PortBinding port_bindings = 4;
   optional int32 flooding_proxy_weight = 5;

   // Back-reference. Expected to be set from the Tunnel Zone side.
   repeated UUID tunnel_zone_ids = 101;
}

@ZoomClass(clazz = classOf[TopologyHost])
class MidoHost extends ZoomObject with Device {
    @ZoomField(name = "id", converter = classOf[UUIDConverter])
    var id: UUID = _

    @ZoomField(name = "port_bindings",
               converter = classOf[PortBindingConverter])
    var portBindings = Map.empty[UUID, String]

    @ZoomField(name = "tunnel_zone_ids", converter = classOf[UUIDConverter])
    var tunnelZoneIds = Set.empty[UUID]

    // The IP address of the host in each one of the tunnel zones
    // (this is stored outside of the host proto).
    var tunnelZones = Map.empty[UUID, IPAddr]
    // The alive status of the host (this is stored outside of the host proto).
    var alive: Boolean = false
      ...
}