Operation Manual – NTPH3C S7500 Series Ethernet Switches Chapter 1 NTP Configuration1-9z If the NTP authentication is not enabled on a client, the client can be synchronizedto a server regardless of the NTP authentication configuration performed on theserver (assuming that the related configurations are performed).z You need to couple the NTP authentication with a trusted key.z The configurations performed on the server and the client must be the same.z A client with NTP authentication enabled is only synchronized to a server that canprovide a trusted key.1.4.2 Configuring NTP AuthenticationI. Configuring NTP authentication on the clientFollow these steps to configure NTP authentication on the client:To do... Use the command... RemarksEnter system view system-view —Enable NTPauthenticationgloballyntp-serviceauthentication enableRequiredBy default, the NTPauthentication is disabledConfigure the NTPauthentication keyntp-serviceauthentication-keyidkey-idauthentication-modemd5 valueRequiredBy default, the NTPauthentication key is notconfiguredConfigure thespecified key to be atrusted keyntp-service reliableauthentication-keyidkey-idRequiredBy default, no trustedauthentication key isconfiguredNTP client mode:ntp-serviceunicast-server{ remote-ip | server-name }authentication-keyidkey-idAssociate thespecified key withthe correspondingNTP server Peer mode:ntp-service unicast-peer{ remote-ip | peer-name }authentication-keyidkey-idz In NTP client mode andNTP peer mode, you needto associate the specifiedkey with the correspondingNTP server on the client.z You can associate the NTPserver with theauthentication key whileconfiguring the switch tooperate in a specific NTPmode. You can alsoassociate them using thiscommand after configuringthe NTP mode where theswitch is to operate
