@Override
 public boolean checkRouterVersion(final VirtualRouter router) {
   if (!VirtualNetworkApplianceManagerImpl.routerVersionCheckEnabled.value()) {
     // Router version check is disabled.
     return true;
   }
   if (router.getTemplateVersion() == null) {
     return false;
   }
   final long dcid = router.getDataCenterId();
   final String trimmedVersion = Version.trimRouterVersion(router.getTemplateVersion());
   return Version.compare(trimmedVersion, NetworkOrchestrationService.MinVRVersion.valueIn(dcid))
       >= 0;
 }
  @Override
  public boolean sendCommandsToRouter(final VirtualRouter router, final Commands cmds)
      throws AgentUnavailableException, ResourceUnavailableException {
    if (!checkRouterVersion(router)) {
      s_logger.debug(
          "Router requires upgrade. Unable to send command to router:"
              + router.getId()
              + ", router template version : "
              + router.getTemplateVersion()
              + ", minimal required version : "
              + NetworkOrchestrationService.MinVRVersion.valueIn(router.getDataCenterId()));
      throw new ResourceUnavailableException(
          "Unable to send command. Router requires upgrade", VirtualRouter.class, router.getId());
    }
    Answer[] answers = null;
    try {
      answers = _agentMgr.send(router.getHostId(), cmds);
    } catch (final OperationTimedoutException e) {
      s_logger.warn("Timed Out", e);
      throw new AgentUnavailableException(
          "Unable to send commands to virtual router ", router.getHostId(), e);
    }

    if (answers == null || answers.length != cmds.size()) {
      return false;
    }

    // FIXME: Have to return state for individual command in the future
    boolean result = true;
    for (final Answer answer : answers) {
      if (!answer.getResult()) {
        result = false;
        break;
      }
    }
    return result;
  }