37
[SwitchA] interface vlan-interface 2
[SwitchA-Vlan-interface2] ntp-service broadcast-client
4. Configure Switch B:
# Enable the NTP service.
<SwitchB> system-view
[SwitchB] ntp-service enable
# Configure Switch B to operate in broadcast client mode and receive broadcast messages on
VLAN-interface 2.
[SwitchB] interface vlan-interface 2
[SwitchB-Vlan-interface2] ntp-service broadcast-client
5. Verify the configuration:
# Switch A and Switch B get synchronized upon receiving a broadcast message from Switch C.
Display the NTP status of Switch A after clock synchronization.
[SwitchA-Vlan-interface2] display ntp-service status
Clock status: synchronized
Clock stratum: 3
System peer: 3.0.1.31
Local mode: bclient
Reference clock ID: 3.0.1.31
Leap indicator: 00
Clock jitter: 0.044281 s
Stability: 0.000 pps
Clock precision: 2^-10
Root delay: 0.00229 ms
Root dispersion: 4.12572 ms
Reference time: d0d289fe.ec43c720 Sat, Jan 8 2011 7:00:14.922
The output shows that Switch A has been synchronized to Switch C, the clock stratum level of
Switch A is 3, and that of Switch C is 2.
# Display IPv4 NTP association information for Switch A.
[SwitchA-Vlan-interface2] display ntp-service sessions
source reference stra reach poll now offset delay disper
********************************************************************************
[1245]3.0.1.31 127.127.1.0 2 1 64 519 -0.0 0.0022 4.1257
Notes: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured.
Total sessions : 1
The output shows that an association has been set up between Switch A and Switch C.
NTP multicast mode configuration example
Network requirements
As shown in Figure 14, Switch C functions as the NTP server for multiple devices on different network
segments and synchronizes the time among multiple devices.
• Switch C's local clock is to be used as a reference source, with the stratum level 2.
• Switch C operates in multicast server mode and sends out multicast messages from VLAN-interface
2.
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