1-24Peer dispersion: 34.30 msReference time: 16:02:49.713 UTC Sep 19 2005 (C6D95F6F.B6872B02)As shown above, Switch A has been synchronized to Switch C, and the clock stratum level of Switch Ais 3, while that of Switch C is 2.# View the NTP session information of Switch A, which shows that an association has been set upbetween Switch A and Switch C.[SwitchA-Vlan-interface3] display ntp-service sessionssource reference stra reach poll now offset delay disper**************************************************************************[1234] 3.0.1.31 127.127.1.0 2 255 64 26 -16.0 40.0 16.6note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configuredTotal associations : 1Refer to IGMP Configuration in the IP Multicast volume for how to configure IGMP and PIM.Configuring NTP Client/Server Mode with AuthenticationNetwork requirementsAs shown in Figure 1-11, perform the following configurations to synchronize the time between DeviceB and Device A and ensure network security.z The local clock of Switch A is to be used as the master clock, with a stratum level of 2.z Switch B works in the client mode and Switch A is to be used as the NTP server of Switch B, withSwitch B as the client.z NTP authentication is to be enabled on both Switch A and Switch B.Figure 1-11 Network diagram for configuration of NTP client/server mode with authenticationConfiguration procedure1) Configure IP addresses for interfaces (omitted)2) Configuration on Switch B:# Enable NTP authentication on Switch B. system-view[SwitchB] ntp-service authentication enable# Set an authentication key.[SwitchB] ntp-service authentication-keyid 42 authentication-mode md5 aNiceKey# Specify the key as a trusted key.
