下挂的ONU只能查询7天的数据流量统计纪录，在OLT上哪里可以更改？或者在ONU 上哪里可以更改？？ runhe11#(config-if-epf-0/1)#display statistics performance 2 historic-24hours 8 Failure: This statistics period does not exist runhe11#(config-if-epf-0/1)#display statistics performance 2 historic-24hours 7 Number of transmitted frames : 0 Number of received frames : 0 Total number of frames : 0 Number of transmitted multicast frames : 0 Number of received multicast frames : 0 Total number of multicast frames : 0 Number of transmitted broadcast frames : 0 Number of received broadcast frames : 0 Total number of boardcast frames : 0 Number of transmitted pause frames : 0 Number of received pause frames : 0 Number of transmitted octets : 0 Number of received octets : 0