H3C Technologies H3C S3100 Series Switches - Manual (Page 706)

1-16
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 above output information indicates that Device B is synchronized to Device A, and the stratum level
of its clock is 3, one level lower than that of Device A.
# View the information about NTP sessions of Device B. (You can see that Device B establishes a
connection with Device A.)
[DeviceB] display ntp-service sessions
source reference stra reach poll now offset delay disper
**************************************************************************
[12345]1.0.1.11 127.127.1.0 2 1 64 1 350.1 15.1 0.0
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured Total
associations : 1
Configuring NTP Symmetric Peer Mode
Network requirements
z The local clock of Device A is set as the NTP master clock, with the clock stratum level of 2.
z Device C (an S3100 Ethernet switch) uses Device A as the NTP server, and Device A works in
server mode automatically.
z The local clock of Device B is set as the NTP master clock, with the clock stratum level of 1. Set
Device C as the peer of Device B.
Network diagram
Figure 1-7 Network diagram for NTP peer mode configuration
Device A
Device B Device C
3.0.1.31/24
3.0.1.32/24 3.0.1.33/24
Configuration procedure
1) Configure Device C.
# Set Device A as the NTP server.
system-view
[DeviceC] ntp-service unicast-server 3.0.1.31
2) Configure Device B (after the Device C is synchronized to Device A).