Operation Manual – NTP
H3C S3100 Series Ethernet Switches Chapter 1 NTP Configuration
1-20
# Enter system view.
<DeviceB> system-view
# Set Device C as the peer of Device B.
[DeviceB] ntp-service unicast-peer 3.0.1.33
Device C and Device B are symmetric peers after the above configuration. Device B
works in symmetric active mode, while Device C works in symmetric passive mode.
Because the stratum level of the local clock of Device B is 1, and that of Device C is 3,
the clock of Device C is synchronized to that of Device B.
View the status of Device C after the clock synchronization.
[DeviceC] display ntp-service status
Clock status: synchronized
Clock stratum: 2
Reference clock ID: 3.0.1.32
Nominal frequency: 100.0000 Hz
Actual frequency: 100.0000 Hz
Clock precision: 2^18
Clock offset: 0.66 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 the clock of Device C is synchronized to that of
Device B and the stratum level of its local clock is 2, one level lower than Device B.
# View the information about the NTP sessions of Device C (you can see that a
connection is established between Device C and Device B).
[DeviceC] display ntp-service sessions
source reference stra reach poll now offset delay disper
*************************************************************************
[1234]3.0.1.32 LOCL 1 95 64 42 -14.3 12.9 2.7
[25]3.0.1.31 127.127.1.0 2 1 64 1 4408.6 38.7 0.0
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured
Total associations : 2
1.8.3 Configuring NTP Broadcast Mode
I. Network requirements
z The local clock of Device C is set as the NTP master clock, with a stratum level of
2. Configure Device C to work in the NTP broadcast server mode and send NTP
broadcast messages through Vlan-interface2.
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