Configuration Guide Configuring NTP
Configuring NTP Access
Control
(Optional) It is used to filter the sources of received NTP packets.
Configures the access control rights for
NTP.
13.4.1 Configuring Basic Functions of NTP
Configuration Effect
External Clock Reference Mode
Use a device as a client to synchronize time from an external reference clock source to the local clock.
After the time synchronization is successful, use the device as a time synchronization server to provide time
synchronization.
Local Clock Reference Mode
Use the local clock of a device as the NTP reference clock source to provide time synchronization.
Notes
In the client/server mode, a device can be used as a time synchronization server to provide time synchronization only
after successfully synchronizing time with a reliable external clock source.
Once the local clock reference mode is configured, the system will not synchronize time with a clock source with a
higher stratum.
Configuring a local clock as the master clock (especially when specifying a lower stratum) may overwrite an effective
clock source. If this command is used for multiple devices in a network, the clock difference between the devices may
cause unstable time synchronization of the network.
Before a local clock is configured as the master clock, if the system never synchronizes time with an external clock
source, you may need to manually calibrate the system clock to ensure that there is no excessive difference. For details
about how to manually calibrate the system clock, refer to the system time configuration section in the configuration
guide.
Configuration Steps
Configuring an NTP Server
(Mandatory) At least one external reference clock source must be specified (A maximum of 20 different external
reference clock sources can be configured).
If it is necessary to configure an NTP key, you must configure NTP security authentication before configuring the NTP
server.
Automatically Updating a Hardware Clock
Optional.
By default, the system updates only the system clock, but not the hardware clock after successful time synchronization.
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