H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 75)

6-7
Task Remarks
Configuring NTP Authentication Optional
Configuring the Operation Modes of NTP
ACs 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 AC 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 ACs 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 AC
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.