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

The local clock of Device A is set as the NTP master clock, with a clock stratum level of 2.

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.

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