HP 4500G PWR 24-Port, Руководство по настройке

Страница: 1896 / 1968

1-7
Task Remarks
Configuring Access-Control Rights Optional
Configuring NTP Authentication Optional
Configuring the Operation Modes of NTP
Devices can implement clock synchronization in one of the following modes:
z
Client/server mode
z
Symmetric mode
z
Broadcast mode
z
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.
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, while a dynamic association is a temporary association created by
the system during operation. A dynamic association will be removed if the system fails to receive
messages from it over a specific long time. In the client/server mode, for example, when you carry out a
command to synchronize the time to a server, the system will create a static association, and the server
will just respond passively upon the receipt of a message, rather than creating an association (static or
dynamic). In the symmetric mode, static associations will be created at the symmetric-active peer side,
and dynamic associations will be created at the symmetric-passive peer side; in the broadcast or
multicast mode, static associations will be created at the server side, and dynamic associations will be
created at the client side.
Configuring NTP Client/Server Mode
For devices working in the client/server mode, you only need to make 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
[
vpn-instance
vpn-instance-name
] {
ip-address
|
server-name
} [
authentication-keyid keyid
|
priority
|
source-interface interface-type
interface-number
|
version number
] *
Required
No NTP
server is
specified by
default.