+ self.previous_measurement = 0\r
+ self.previous_monitor_time = 0\r
+\r
+ #self.switch_dpid = x = int(str(next_node.dpid), 16)\r
+ self.switch_dpid = int(str(next_node.dpid), 16)\r
+ self.metric_key = '{0}_{1}'.format(direction, metric)\r
+\r
+ except Exception as ex:\r
+ logging.exception("get_txrate error.")\r
+ return ex.message\r