H3C S5100-SI Series Operation Manual page 649

Operation Manual – NTP
H3C S5100-SI/EI Series Ethernet Switches
III. Configuration procedure
1) Configure Device C.
# Enter system view.
<DeviceC> system-view
# Set Device C as the broadcast server, which sends broadcast messages through
VLAN-interface 2.
[DeviceC] interface Vlan-interface 2
[DeviceC-Vlan-interface2] ntp-service broadcast-server
2) Configure Device A. (Perform the same configuration on Device D.)
# Enter system view.
<DeviceA> system-view
# Set Device A as a broadcast client.
[DeviceA] interface Vlan-interface 2
[DeviceA-Vlan-interface2] ntp-service broadcast-client
After the above configurations, Device A and Device D will listen to broadcast
messages through their own VLAN-interface 2, and Device C will send broadcast
messages through VLAN-interface 2. Because Device A and Device C do not share the
same network segment, Device A cannot receive broadcast messages from Device C,
while Device D is synchronized to Device C after receiving broadcast messages from
Device C.
View the NTP status of Device D after the clock synchronization.
[DeviceD] display ntp-service status
Clock status: synchronized
Clock stratum: 3
Reference clock ID: 3.0.1.31
Nominal frequency: 60.0002 Hz
Actual frequency: 60.0002 Hz
Clock precision: 2^18
Clock offset: 198.7425 ms
Root delay: 27.47 ms
Root dispersion: 208.39 ms
Peer dispersion: 9.63 ms
Reference time: 17:03:32.022 UTC Apr 2 2007 (BF422AE4.05AEA86C)
The output information indicates that Device D is synchronized to Device C, with the
clock stratum level of 3, one level lower than that of Device C.
# View the information about the NTP sessions of Device D and you can see that a
connection is established between Device D and Device C.
[DeviceD] display ntp-service sessions
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Chapter 1 NTP Configuration