1-17Root delay: 0.00 msRoot dispersion: 0.00 msPeer dispersion: 0.00 msReference time: 00:00:00.000 UTC Jan 1 1900 (00000000.00000000)# Specify Switch A as the NTP server of Switch B so that Switch B is synchronized to Switch A. system-view[SwitchB] ntp-service unicast-server 1.0.1.11# View the NTP status of Switch B after clock synchronization.[SwitchB] display ntp-service statusClock status: synchronizedClock stratum: 3Reference clock ID: 1.0.1.11Nominal frequency: 64.0000 HzActual frequency: 64.0000 HzClock precision: 2^7Clock offset: 0.0000 msRoot delay: 31.00 msRoot dispersion: 1.05 msPeer dispersion: 7.81 msReference time: 14:53:27.371 UTC Sep 19 2005 (C6D94F67.5EF9DB22)As shown above, Switch B has been synchronized to Switch A, and the clock stratum level of Switch Bis 3, while that of Switch A is 2.# View the NTP session information of Switch B, which shows that an association has been set upbetween Switch B and Switch A.[SwitchB] display ntp-service sessionssource reference stra reach poll now offset delay disper**************************************************************************[12345] 1.0.1.11 127.127.1.0 2 63 64 3 -75.5 31.0 16.5note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configuredTotal associations : 1Configuring the NTP Symmetric ModeNetwork requirementsPerform the following configurations to synchronize time among devices:z The local clock of Device A is to be configured as a reference source, with the stratum level of 2.z Device B works in the client mode and Device A is to be used as the NTP server of Device B.z After Device B is synchronized to Device A , Device C works in the symmetric-active mode andDevice B will act as peer of Device C. Device C is the symmetric-active peer while Device B is thesymmetric-passive peer.
