docs: def removeRouterPrefix(self, prefixEntry):
          """remove the configured prefix on a border router
  
          Args:
              prefixEntry: a on-mesh prefix entry
  
          Returns:
              True: successful to remove the prefix entry from border router
              False: fail to remove the prefix entry from border router
          """
          print '%s call removeRouterPrefix' % self.port
          print prefixEntry
          prefix = self.__convertIp6PrefixStringToIp6Address(str(prefixEntry))
          try:
              prefixLen = 64
              cmd = 'prefix remove %s/%d' % (prefix, prefixLen)
              print cmd
              if self.__sendCommand(cmd)[0] == 'Done':
                  # send server data ntf to leader
                  return self.__sendCommand('netdataregister')[0] == 'Done'
              else:
                  return False
          except Exception, e:
              ModuleHelper.WriteIntoDebugLogger("removeRouterPrefix() Error: " + str(e))