Network requirements, Network diagram – H3C Technologies H3C S3100 Series Switches User Manual
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[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
Clock status: synchronized
Clock stratum: 3
Reference clock ID: 3.0.1.31
Nominal frequency: 100.0000 Hz
Actual frequency: 100.0000 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 a clock stratum level of
3, one stratum level lower than that Device C.
# View the information about the NTP sessions of Device D (You can see that a connection is
established between Device D and Device C).
[DeviceD] display ntp-service sessions
source reference stra reach poll now offset delay disper
**************************************************************************
[1234]3.0.1.31 127.127.1.0 2 1 64 377 26.1 199.53 9.7
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured Total
associations : 1
Configuring NTP Server/Client Mode with Authentication
Network requirements
z
The local clock of Device A is set as the NTP master clock, with a clock stratum level of 2.
z
Device B is an S3100 Ethernet switch and uses Device A as the NTP server. Device B is set to
work in client mode, while Device A works in server mode automatically.
z
The NTP authentication function is enabled on Device A and Device B.
Network diagram
Figure 1-10 Network diagram for NTP server/client mode with authentication configuration