H3C Technologies H3C SR8800 - Manual (Page 85)

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[RouterC-GigabitEthernet3/1/10] ntp-service broadcast-server
3. Configure Router A:
# Configure Router A to work in the broadcast client mode and receive broadcast messages on
GigabitEthernet 3/1/10.
system-view
[RouterA] interface GigabitEthernet 3/1/10
[RouterA-GigabitEthernet3/1/10] ntp-service broadcast-client
4. Configure Router B:
# Configure Router B to work in broadcast client mode and receive broadcast messages on
GigabitEthernet 3/1/10.
system-view
[RouterB] interface GigabitEthernet 3/1/10
[RouterB-GigabitEthernet3/1/10] ntp-service broadcast-client
Router A and Router B get synchronized upon receiving a broadcast message from Router C.
# Take Router A as an example. View the NTP status of Router A after clock synchronization.
[RouterA] display ntp-service status
Clock status: synchronized
Clock stratum: 3
Reference clock ID: 3.0.1.31
Nominal frequency: 64.0000 Hz
Actual frequency: 64.0000 Hz
Clock precision: 2^7
Clock offset: 0.0000 ms
Root delay: 31.00 ms
Root dispersion: 8.31 ms
Peer dispersion: 34.30 ms
Reference time: 16:01:51.713 UTC Sep 19 2005 (C6D95F6F.B6872B02)
As shown above, Router A has been synchronized to Router C and the clock stratum level of Router
A is 3, while that of Router C is 2.
# View the NTP session information of Router A, which shows that an association has been set up
between Router A and Router C.
[RouterA-GigabitEthernet3/1/10] display ntp-service sessions
source reference stra reach poll now offset delay disper
**************************************************************************
[1234] 3.0.1.31 127.127.1.0 2 254 64 62 -16.0 32.0 16.6
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured
Total associations : 1
Configuring NTP multicast mode
Network requirements
As shown in Figure 28 , Router C functions as the NTP server for multiple routers on different network
segments and synchronizes the time among multiple routers. More specifically:
• Router C’s local clock is to be used as a reference source, with the stratum level of 2.
• Router C works in the multicast serve mode and sends out multicast messages from GigabitEthernet
3/1/10.