H3C Technologies H3C S5120 Series Switches - Manual (Page 568)

1-19
Nominal frequency: 100.0000 Hz
Actual frequency: 100.0000 Hz
Clock precision: 2^18
Clock offset: -21.1982 ms
Root delay: 15.00 ms
Root dispersion: 775.15 ms
Peer dispersion: 34.29 ms
Reference time: 15:22:47.083 UTC Sep 19 2005 (C6D95647.153F7CED)
As shown above, Device C has been synchronized to Device B and the clock stratum level of Device C
is 4, while that of Device C is 1.
# View the NTP session information of Device B, which shows that an association has been set up
between Device B and Device C.
[DeviceB] display ntp-service sessions
source reference stra reach poll now offset delay disper
**************************************************************************
[245] 3.0.1.31 127.127.1.0 2 15 64 24 10535.0 19.6 14.5
[1234] 3.0.1.33 LOCL 1 14 64 27 -77.0 16.0 14.8
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured
Total associations : 2
Configuring NTP Broadcast Mode
Network requirements
As shown in Figure 1-9 , Switch C functions as the NTP server for multiple devices on a network
segment and synchronizes the time among multiple devices. To realize this requirement, perform the
following configurations:
z Switch C’s local clock is to be used as a reference source, with the stratum level of 2.
z Switch C works in the broadcast server mode and sends out broadcast messages from
VLAN-interface 2.
z Switch A and Switch B work in the broadcast client mode. Switch A and Switch B listens to
broadcast messages through its VLAN-interface 2.
Figure 1-9 Network diagram for NTP broadcast mode configuration
Vlan-int2
3.0.1.31/24
Vlan-int2
3.0.1.32/24
Vlan-int2
3.0.1.30/24
Switch A
Switch C
Switch B