3Com Switch 7700 Configuration Manual page 373

Configuring NTP Multicast Mode
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Configuring Authentication-Enabled NTP Server Mode
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Configuring NTP Servers
On SW77001, set the local clock as the NTP master clock at stratum 2. On
SW77002, configure SW77001 as the time server in server mode and set the local
equipment as in client mode.
Figure 8 Typical NTP Configuration Networking Diagram
SW77001
SW77000
SW77002
Configure the Switch SW77001:
1 Enter system view.
<SW77001> system-view
2 Set the local clock as the NTP master clock at stratum 2.
[SW77001] ntp-service refclock-master 2
Configure Ethernet Switch SW77002:
1 Enter system view.
<SW77002> system-view
2 Set SW77001 as the NTP server.
[SW77002] ntp-service unicast-server 1.0.1.11
The above examples synchronized SW77002 by SW77001. Before the
synchronization, the SW77002 is shown in the following status:
[SW77002] 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
SW77003
SW77004
SW77005
NTP 365