1-21Root dispersion: 208.39 msPeer dispersion: 9.63 msReference time: 17:03:32.022 UTC Apr 2 2007 (BF422AE4.05AEA86C)The output information indicates that Device D is synchronized to Device C, with a clock stratum level of3, one stratum level lower than that Device C.# View the information about the NTP sessions of Device D (you can see that a connection isestablished between Device D and Device C).[DeviceD] display ntp-service sessionssource reference stra reach poll now offset delay disper**************************************************************************[1234]3.0.1.31 127.127.1.0 2 1 64 377 26.1 199.53 9.7note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured Totalassociations : 1Configuring NTP Server/Client Mode with AuthenticationNetwork requirementsz The local clock of Device A is set as the NTP master clock, with a clock stratum level of 2.z Device B is an S4500 Ethernet switch and uses Device A as the NTP server. Device B is set towork in client mode, while Device A works in server mode automatically.z The NTP authentication function is enabled on Device A and Device B.Network diagramFigure 1-10 Network diagram for NTP server/client mode with authentication configurationConfiguration procedurez Configure Device B.# Enter system view. system-view# Enable the NTP authentication function.[DeviceB] ntp-service authentication enable# Configure an MD5 authentication key, with the key ID being 42 and the key being aNiceKey.[DeviceB] ntp-service authentication-keyid 42 authentication-mode md5 aNiceKey# Specify the key 42 as a trusted key.[DeviceB] ntp-service reliable authentication-keyid 42# Associate the trusted key with the NTP server (Device A).[DeviceB] ntp-service unicast-server 1.0.1.11 authentication-keyid 42After the above configurations, Device B is ready to synchronize with Device A. Because the NTPauthentication function is not enabled on Device A, the clock of Device B will fail to be synchronized tothat of Device A.
