Operation Manual – NTPH3C S5600 Series Ethernet Switches-Release 1510 Chapter 1 NTP Configuration1-11Operation Command DescriptionConfigure thespecified key to bea trusted keyntp-service reliableauthentication-keyid key-idRequiredBy default, an authenticationkey is not a trusted keyEnter VLANinterface viewinterface vlan-interfacevlan-id —Broadcast server mode:ntp-servicebroadcast-serverauthentication-keyid key-idAssociate aspecified key withthe correspondingNTP server Multicast server mode:ntp-servicemulticast-serverauthentication-keyid key-idz In NTP broadcast servermode and NTP multicastserver mode, you need toassociate the specified keywith the correspondingNTP server on the serverz You can associate an NTPserver with anauthentication key whileconfiguring a switch tooperate in a specific NTPmode. You can alsoassociate them using thiscommand after configuringthe NTP mode where aswitch is to operateNote:The procedures for configuring NTP authentication on the server are the same as thaton the client. Besides, the client and the server must be configured with the sameauthentication key.1.5 Configuration of Optional NTP ParametersOptional NTP parameters are:z The local VLAN interface that sends NTP packetsz The number of the dynamic sessions that can be established locallyz Disabling the VLAN interface configured on a switch from receiving NTP packetsTable 1-6 Configure optional NTP parametersOperation Command DescriptionEnter system view system-view —Configure the localinterface thatsends NTPpacketsntp-servicesource-interfaceinterface-typeinterface-numberOptional