3Com Switch 7700 Configuration Manual page 377

Configure Ethernet Switch SW77004:
1 Enter system view.
<SW77004> system-view
2 Enter Vlan-interface2 view.
[SW77004] interface vlan-interface 2
[SW77004-Vlan-Interface2] ntp-service broadcast-client
Configure Ethernet Switch SW77001:
1 Enter system view.
<SW77001> system-view
2 Enter Vlan-interface2 view.
[SW77001] interface vlan-interface 2
[SW77001-Vlan-Interface2] ntp-service broadcast-client
The above examples configured SW77004 and SW77001 to listen to the
broadcast through Vlan-interface2, SW77003 to broadcast packets from
Vlan-interface2. Since SW77001 and SW77003 are not located on the same
segment, they cannot receive any broadcast packets from SW77003, while
SW77004 is synchronized by SW77003 after receiving its broadcast packet.
After the synchronization, you can find the state of SW77004 as follows:
[SW77004] display ntp-service status
clock status: synchronized
clock stratum: 8
reference clock ID: LOCAL(0)
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: 10.94 ms
peer dispersion: 10.00 ms
reference time: 20:54:25.156 UTC Mar 7 2002(C0325201.2811A112)
By this time, SW77004 has been synchronized by SW77003 and it is at stratum 3,
higher than SW77003 by 1.
Display the status of SW77004 sessions and you will see SW77004 has been
connected to SW77003:
[SW77002] display ntp-service sessions
source
disper
reference stra reach poll
NTP 369
now offset delay