72
# Take Switch A as an example. View the NTP status of Switch A after clock synchronization.
[SwitchA-Vlan-interface2] 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)
The output shows that Switch A has been synchronized to Switch C, and the clock stratum level of Switch
A is 3, while that of Switch C is 2.
# View the NTP session information of Switch A, which shows that an association has been set up
between Switch A and Switch C.
[SwitchA-Vlan-interface2] 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 example
Network requirements
As shown in Figure 28, 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 of 2.
• Switch C works in multicast server mode and sends out multicast messages from VLAN-interface 2.
• Switch A and Switch D work in multicast client mode and receive multicast messages through VLAN-
interface 3 and VLAN-interface 2 respectively.
NOTE:
In this example, Switch B must be a Layer 3 switch supporting multicast routing.
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