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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 the client/server mode or symmetric mode, you need to configure only clients or symmetric-active

peers. For the 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, but not on the servers.

Follow these steps to configure an NTP client:

To do… Use the command… Remarks

Enter system view system-view —

Specify an NTP server for the

device

ntp-service unicast-server

{ ip-address | server-name }

[ authentication-keyid keyid |

priority | source-interface

interface-type interface-number |

version number ] *

Required

No NTP server is specified by

default.

HP JG221A User Manual

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