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NOTE:
A broadcast server can only synchronize broadcast clients 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
1. Enter system view.
system-view —
2. Enter Layer 3 Ethernet
interface view or VLAN
interface view.
interface interface-type interface-
number
Enter the interface used to receive
NTP multicast messages.
3. 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
1. Enter system view.
system-view —
2. Enter Layer 3 Ethernet
interface view or VLAN
interface view.
interface interface-type interface-
number
Enter the interface used to send
NTP multicast message.
3. 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 only synchronize broadcast clients 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 optional parameters of NTP
Specifying the source interface for NTP messages
If you specify the source interface for NTP messages, the device sets the source IP address of the NTP
messages as the primary IP address of the specified interface when sending the NTP messages.
When the device responds to an NTP request received, the source IP address of the NTP response is
always the IP address of the interface that received the NTP request.
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