H3C Technologies H3C S5120 Series Switches - Manual (Page 559)

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Configuring NTP Broadcast Mode
The broadcast server periodically sends NTP broadcast messages to the broadcast address
255.255.255.255. After receiving the messages, the device working in NTP broadcast client mode
sends a reply and synchronizes its local clock.
For devices working in the broadcast mode, you need to configure both the server and clients. Because
an interface needs to be specified on the broadcast server for sending NTP broadcast messages and
an interface also needs to be specified on each broadcast client for receiving broadcast messages, the
NTP broadcast mode can be configured only in the specific interface view.
Configuring a broadcast client
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
Required
Enter the interface used to
receive NTP broadcast
messages.
Configure the device to work in
the NTP broadcast client mode
ntp-service broadcast-client Required
Configuring the broadcast server
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
Enter the interface used to
send NTP broadcast
messages.
Configure the device to work in
the NTP broadcast server
mode ntp-service broadcast-server
[ authentication-keyid keyid |
version number ] *
Required
A broadcast server can synchronize broadcast clients only after its clock has been synchronized.
Configuring NTP Multicast Mode
The multicast server periodically sends NTP multicast messages to multicast clients, which send replies
after receiving the messages and synchronize their local clocks.
For devices working in the multicast mode, you need to configure both the server and clients. The NTP
multicast mode must be configured in the specific interface view.