3Com 4210 PWR Configuration Manual page 385

<DeviceC> system-view
# Set Device C as the broadcast server, which sends broadcast messages through
Vlan-interface2.
[DeviceC] interface Vlan-interface 2
[DeviceC-Vlan-interface2] ntp-service broadcast-server
2 Configure Device A. (perform the same configuration on Device D)
# Enter system view.
<DeviceA> system-view
# Set Device A as a broadcast client.
[DeviceA] interface Vlan-interface 2
[DeviceA-Vlan-interface2] ntp-service broadcast-client
After the above configurations, Device A and Device D will listen to broadcast
messages through their own Vlan-interface2, and Device C will send broadcast
messages through Vlan-interface2. Because Device A and Device C do not share
the same network segment, Device A cannot receive broadcast messages from
Device C, while Device D is synchronized to Device C after receiving broadcast
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 Thu Apr 2 2007 (BF422AE4.05AEA86C)
The output information indicates that Device D is synchronized to Device C, with
the clock stratum level of 3, one level lower than that of Device C.
# View the information about the NTP sessions of Device D and you can see that a
connection is established between Device D and Device C.
[DeviceD] display ntp-service sessions
**************************************************************************
[1234]3.0.1.31
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured Tota
l associations :
Configuring NTP Network requirements
Multicast Mode
■
■
source reference
127.127.1.0
1
The local clock of Device C is set as the NTP master clock, with a clock stratum
level of 2. Configure Device C to work in the NTP multicast server mode and
advertise multicast NTP messages through Vlan-interface2.
Device A and Device D are two Switch 4210s. Configure Device A and Device D
to work in the NTP multicast client mode and listen to multicast messages
through their own Vlan-interface2.
Configuration Example
stra reach poll now offset
2 1 64 377
383
delay disper
26.1 199.53 9.7