Configuring The Operation Modes Of Ntp; Operation Modes And Static And Dynamic Associations; Configuring Ntp Client/Server Mode - H3C S3100V2-52TP Configuration Manual

Configuring the operation modes of NTP

Devices can implement clock synchronization in one of the following modes:
Client/server mode
•
• Symmetric mode
Broadcast mode
•
Multicast mode
•
For client/server mode or symmetric mode, you need to configure only clients or symmetric-active peers.
For broadcast or multicast mode, you need to configure both servers and clients.

Operation modes and static and dynamic associations

A single device can have a maximum of 128 associations at the same time, including static associations
and dynamic associations.
A static association refers to an association that a user has manually created by using an NTP
•
command.
• A dynamic association is a temporary association created by the system during operation. A
dynamic association is removed if the system fails to receive messages from it over a specific long
time.
Operation modes affect the creation of associations in the following ways:
• In client/server mode, when you execute a command to synchronize the time to a server, the system
creates a static association. The server will not create an association (static or dynamic), but will
simply respond passively upon the receipt of a message.
In symmetric mode, static associations are created at the symmetric-active peer side, and dynamic
•
associations are created at the symmetric-passive peer side.
In broadcast or multicast mode, static associations are created at the server side, and dynamic
•
associations are created at the client side.

Configuring NTP client/server mode

For devices working in client/server mode, perform configurations on the clients.
Follow these steps to specify an NTP server on the client:
To do...
Enter system view
Specify an NTP server for
the device
Use the command...
system-view
ntp-service unicast-server { ip-address |
server-name } [ authentication-keyid keyid | priority
| source-interface interface-type interface-number |
version number ] *
15
Remarks
—
Required
No NTP server is
specified by default.