1. 设置NTP PRIMARY Server
SET NTP PRIMARY 10.12.173.120
2. 设置NTP SECONDARY Server
SET NTP SECONDARY 10.12.181.2
3. 开始NTP同步
ENABLE NTP
4. 设置NTP同步周期(以秒为单位)
SET NTP POLL 86400
5. 设置时区
SET TIMEZONE Asia/Shanghai
Poll time should be between 60 and 86,400 seconds.