3Com 4210 PWR Configuration Manual page 383

Configuring NTP
Symmetric Peer Mode
[DeviceB] display ntp-service sessions
source
**************************************************************************
[12345]1.0.1.11
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured
Total associations :
Network requirements
The local clock of Device A is set as the NTP master clock, with the clock
■
stratum level of 2.
Device C (a Switch 4210) uses Device A as the NTP server, and Device A works
■
in server mode automatically.
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 115 Network diagram for NTP peer mode configuration
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Device B
Configuration procedure
1 Configure Device C.
# Set Device A as the NTP server.
<DeviceC> system-view
[DeviceC] ntp-service unicast-server 3.0.1.31
2 Configure Device B (after the Device C is synchronized to Device A).
# 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
reference stra reach poll
127.127.1.0 2 1
1
Device A
3.0 .1.31/24
3 .0.1.33/24
Device C
Configuration Example
now offset delay disper
64 1 350.1 15.1
381
0.0