1-19Reference clock ID: 3.0.1.32Nominal frequency: 100.0000 HzActual frequency: 100.0000 HzClock precision: 2^18Clock offset: -21.1982 msRoot delay: 15.00 msRoot dispersion: 775.15 msPeer dispersion: 34.29 msReference 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 Cis 4.# View the NTP session information of Device C, which shows that an association has been set upbetween Device B and Device C.[DeviceC] display ntp-service sessionssource reference stra reach poll now offset delay disper********************************************************************************[12345] 3.0.1.32 3.0.1.31 3 3 64 16 -6.4 4.8 1.0note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configuredTotal associations : 1Configuring NTP Broadcast ModeNetwork requirementsAs shown in Figure 1-9, Switch C functions as the NTP server for multiple devices on a networksegment and synchronizes the time among multiple devices. To realize this requirement, perform thefollowing 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 fromVLAN-interface 2.z Switch A and Switch B work in the broadcast client mode. Switch A and Switch B listens tobroadcast messages through its VLAN-interface 2.Figure 1-9 Network diagram for NTP broadcast mode configurationVlan-int23.0.1.31/24Vlan-int23.0.1.32/24Vlan-int23.0.1.30/24Switch ASwitch CSwitch B
