H3C Technologies H3C SecPath F1000-E - Manual (Page 122)

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NOTE:
A broadcast server can synchronize broadcast clients only when 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 multicast mode, configure both the server and clients. The NTP multicast mode
must be configured in the specific interface view.
Configuring a multicast client
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number Enter the interface used to receive
NTP multicast messages.
Configure the device to work in
NTP multicast client mode ntp-service multicast-client
[ ip-address ]
Required
Configuring the multicast 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 multicast message.
Configure the device to work in
NTP multicast server mode
ntp-service multicast-server
[ ip-address ]
[ authentication-keyid keyid |
ttl ttl-number | version number ]
*
Required
NOTE:
•
A multicast server can synchronize broadcast clients only when its clock has been synchronized.
• You can configure up to 1024 multicast clients, among which 128 can take effect at the same time.
Configuring the Local Clock as a Reference Source
A network device can get its clock synchronized in either of the following two ways:
• Synchronized to the local clock, which works as the reference source.
• Synchronized to another device on the network in any of the four NTP operation modes previously
described.
If you configure two synchronization modes, the device selects the optimal clock as the reference source.
Follow these steps to configure the local clock as a reference source: