3Com Switch 7750 SeriesCommand Reference Guide – NTP Chapter 1 NTP Configuration Commands1-12ViewSystem viewParameterip-address: Specifies the reference clock IP address as 127.127.1.u. Here, u rangesfrom 0 to 3.stratum: Specifies which stratum the local clock is located at. The value ranges from 1to 15.DescriptionUse the ntp-service refclock-master command to configure an external referenceclock or the local clock as an NTP master clock.Use the undo ntp-service refclock-master command to cancel the NTP master clocksettings.By default, no NTP master clock is configured. When ip-address is not specified, thelocal clock is set to the NTP master clock by default. When stratum is not specified, thelocal clock is located at stratum 8 by default.You can use this command to designate an external reference clock or the local clockas an NTP master clock to provide synchronized time to other devices. ip-addressspecifies the IP address of an external clock as 127.127.1.u. If no IP address isspecified, the local clock is configured as the NTP master clock by default. You canalso specify the stratum at which the NTP master clock is located.Example# Specify the local clock as the NTP master clock to provide synchronized time for itspeers and locate the master clock at stratum 3.<3Com> system-viewSystem View: return to User View with Ctrl+Z.[3Com] ntp-service refclock-master 31.1.15 ntp-service reliable authentication-keyidSyntaxntp-service reliable authentication-keyid numberundo ntp-service reliable authentication-keyid numberViewSystem view
