3com 4210 PWR 9-Port 3CR17341-91-ME 用户手册

<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

 

    source          reference       stra reach poll  now offset   delay disper

 

**************************************************************************

 

[1234]3.0.1.31     127.127.1.0      2    1    64   377    26.1   199.53   9.7

 

note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured Tota

l associations :  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.