H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 24)

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NOTE:
•
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 just responds passively upon the receipt of a
message, rather than creating an association (static or dynamic). 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 on the
server, and dynamic associations are created on the client.
Configuring NTP client/server mode
For devices operating in client/server mode, make configurations on the clients.
To configure an NTP client:
Step Command Remarks
1. Enter system view. system-view N/A
2. 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 ] *
By default, no NTP server is specified.
The ip-address argument must be a unicast
address, rather than a broadcast address, a
multicast address or the IP address of the local
clock.
NOTE:
•
When the source interface for NTP messages is specified by the source-interface keyword, the source IP
address of the NTP messages is configured as the primary IP address of the specified interface.
• A device can act as a server to synchronize the clock of other devices only after its clock has been
synchronized. If the clock of a server has a stratum level higher than or equal to that of a client's clock,
the client will not synchronize its clock to the server's.
• You can configure multiple servers by repeating the ntp-service unicast-server command. The clients
select the optimal reference source.
Configuring the NTP symmetric peers mode
For devices operating in symmetric mode, specify a symmetric-passive peer on a symmetric-active peer.
To configure a symmetric-active device: