H3C S3100 8C SI Operation Manual page 670

Operation Manual – NTP
H3C S3100 Series Ethernet Switches
II. Network diagram
Vlan-int2
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Device A
Figure 1-9 Network diagram for NTP multicast mode configuration
III. Configuration procedure
1) Configure Device C.
# Enter system view.
<DeviceC> system-view
# Set Device C as a multicast server to send multicast messages through
Vlan-interface2.
[DeviceC] interface Vlan-interface 2
[DeviceC-Vlan-interface2] ntp-service multicast-server
2) Configure Device A (perform the same configuration on Device D).
# Enter system view.
<DeviceA> system-view
# Set Device A as a multicast client to listen to multicast messages through
Vlan-interface2.
[DeviceA] interface Vlan-interface 2
[DeviceA-Vlan-interface2] ntp-service multicast-client
After the above configurations, Device A and Device D respectively listen to multicast
messages through their own Vlan-interface2, and Device C advertises multicast
messages through Vlan-interface2. Because Device A and Device C do not share the
same network segment, Device A cannot receive multicast messages from Device C,
while Device D is synchronized to Device C after receiving multicast messages from
Device C.
View the NTP status of Device D after the clock synchronization.
[DeviceD] display ntp-service status
Device B
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1-23
Chapter 1 NTP Configuration
Vlan-int2
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Device C
Vlan-int2
Device D