3Com 4200G 12-Port Configuration Manual page 317

NTP Broadcast Mode
Configuration
Display the status of the S4200G switch after the synchronization.
[S4200G] display ntp-service status
Clock status: synchronized
Clock stratum: 2
Reference clock ID: 3.0.1.32
Nominal frequency: 250.0000 Hz
Actual frequency: 249.9992 Hz
Clock precision: 2^19
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 Thu Sep 6 2001 (BF422AE4.05AEA86C)
The output information indicates that the S4200G 1 series switch is synchronized to
S4200G 3 and the stratum of its local clock is 2, one stratum higher than S4200G 3.
c Display the information about the NTP sessions of the S4200G 1 series switch and
you can see that a connection is established between the S4200G 1 series switch
and S4200G 3.
[S4200G] display ntp-service sessions
source reference
disper
****************************************************
[ 2]3.0.1.32
note: 1 source(master),2 source(peer),3 selected,4 candidate,5
configured
Network requirements
S4200G3 sets its local clock to be an NTP master clock, with the stratum being 2. NTP
packets are broadcast through VLAN interface 2.
Configure S4200 to listen broadcast packets through their VLAN interface 2.
This example assumes that S4200G3 is a switch that supports the local clock being
the master clock.
Network diagram
Figure 96 Network diagram for the NTP broadcast mode configuration
stra reach poll
0.0.0.0 1 1
Configuration Example 303
now offset
64 1 350.1 15.1
delay
0.0