25-11z If you have specified the source interface for NTP messages in the ntp-service unicast-server orntp-service unicast-peer command, the interface specified in the ntp-service unicast-server orntp-service unicast-peer command serves as the source interface of NTP messages.z If you have configured the ntp-service broadcast-server or ntp-service multicast-servercommand, the source interface of the broadcast or multicast NTP messages is the interfaceconfigured with the respective command.Disabling an Interface from Receiving NTP MessagesWhen NTP is enabled, NTP messages can be received from all the interfaces by default, and you candisable an interface from receiving NTP messages through the following configuration.To do… Use the command… RemarksEnter system view system-view —Enter interface view interface interface-typeinterface-number —Disable the interface fromreceiving NTP messagesntp-service in-interfacedisableRequiredAn interface is enabled to receiveNTP messages by default.Configuring the Maximum Number of Dynamic Sessions AllowedTo do… Use the command… RemarksEnter system view system-view —Configure the maximum number ofdynamic sessions allowed to beestablished locallyntp-servicemax-dynamic-sessions numberRequired100 by defaultConfiguring Access-Control RightsWith the following command, you can configure the NTP service access-control right to the localdevice. There are four access-control rights, as follows:z query: control query permitted. This level of right permits the peer devices to perform controlquery to the NTP service on the local device but does not permit a peer device to synchronize itsclock to that of the local device. The so-called “control query” refers to query of some states of theNTP service, including alarm information, authentication status, clock source information, and soon.z synchronization: server access only. This level of right permits a peer device to synchronize itsclock to that of the local device but does not permit the peer devices to perform control query.z server: server access and query permitted. This level of right permits the peer devices to performsynchronization and control query to the local device but does not permit the local device tosynchronize its clock to that of a peer device.
