3Com SuperStack 4 Configuration Manual page 353

Configuration Procedure
Configure Switch 1:
1 Enter System View.
<switch1> system-view
2 Set the local clock as the NTP master clock at stratum 2.
[switch1]ntp-service refclock-master 2
Configure Switch 2:
1 Enter System View.
<switch2> system-view
2 Set SW5500 1 as the NTP server.
[switch2]ntp-service unicast-server 1.0.1.11
The above examples synchronized Switch 2 by Switch 1. Before the
synchronization, the Switch 2 is shown in the following status:
[switch2]display ntp-service status
clock status: unsynchronized
clock stratum: 16
reference clock ID: none
nominal frequency: 100.0000 Hz
actual frequency: 100.0000 Hz
clock precision: 2^17
clock offset: 0.0000 ms
root delay: 0.00 ms
root dispersion: 0.00 ms
peer dispersion: 0.00 ms
reference time: 00:00:00.000 UTC Jan 1 1900(00000000.00000000)
After the synchronization, Switch 2 turns into the following status:
[switch2]display ntp-service status
clock status: synchronized
clock stratum: 3
reference clock ID: 1.0.1.11
nominal frequency: 60.0002 Hz
actual frequency: 60.0002 Hz
clock precision: 2^17
clock offset: -9.8258 ms
root delay: 27.10 ms
root dispersion: 48.29 ms
peer dispersion: 10.94 ms
reference time: 19:21:32.287 UTC Oct 24 2004(C5267F3C.49A61EOC)
By this time, Switch 2 has been synchronized by Switch 1 and is at stratum 3,
higher than Switch 1 by 1.
Display the sessions of Switch 2 and you will see Switch 2 has been connected
with Switch 1.
[switch2]display ntp-service sessions
source reference stra reach poll now offset delay disper
Typical NTP Configuration Examples 365