1-22[DeviceA] ntp-service authentication-keyid 42 authentication-mode md5 aNiceKey# Specify the key as a trusted key.[DeviceA] ntp-service reliable authentication-keyid 42# View the NTP status of Device B after clock synchronization.[DeviceB] display ntp-service statusClock status: synchronizedClock stratum: 3Reference clock ID: 1.0.1.11Nominal frequency: 100.0000 HzActual frequency: 100.0000 HzClock precision: 2^18Clock 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, Device B has been synchronized to Device A, and the clock stratum level of Device Bis 3, while that of Device A is 2.# View the NTP session information of Device B, which shows that an association has been set upDevice B and Device A.[DeviceB] 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 NTP Broadcast Mode with AuthenticationNetwork requirementsz Switch C’s local clock is to be used as a reference source, with the stratum level of 3.z Switch C works in the broadcast server mode and sends out broadcast messages fromVLAN-interface 2.z Switch D works in the broadcast client mode and receives broadcast messages throughVLAN-interface 2.z NTP authentication is enabled on both Switch C and Switch D.
