H3C Technologies H3C SecPath F1000-E - Manual (Page 115)

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Figure 49 Network diagram
NTP configuration task list
Task Remarks
Configuring the NTP operation modes Required.
Configuring the local clock as a reference source Optional.
Configuring optional NTP parameters Optional.
Configuring access-control rights Optional.
Configuring NTP authentication Optional.
Configuring the NTP operation modes
Devices can implement clock synchronization in one of the following modes:
• Client/server mode—Configure only clients.
• Symmetric mode—Configure only symmetric-active peers.
• Broadcast mode—Configure both clients and servers.
• Multicast mode—Configure both clients and servers.
Configuration guidelines
• 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.
• In client/server mode, for example, when you execute a command to synchronize the time to a
server, the system creates a static association, and the server simply responds passively upon the