if (fipPoolModel == null) {
fipPoolModel = new FloatingIpPoolModel();
fipPoolModel.addToVirtualNetwork(vnModel);
fipPoolModel.build(_manager.getModelController());
try {
fipPoolModel.update(_manager.getModelController());
vnModel.setFipPoolModel(fipPoolModel);
} catch (Exception ex) {
s_logger.warn("floating-ip-pool create: ", ex);
return false;
}