H3C Technologies H3C SecBlade LB Cards - Manual (Page 128)

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After the configuration, you can see that the current system time displayed on the System Time
page is the same for Device A and Device B.
Configuring NTP at the CLI
NTP configuration task list
Task Remarks
Configuring NTP operation modes Required.
Configuring the local clock as a reference source Optional.
Configuring optional parameters for NTP Optional.
Configuring access-control rights Optional.
Configuring NTP authentication Optional.
Configuring 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.
Configuring the NTP client/server mode
If you specify the source interface for NTP messages by specifying the source interface source-interface
option, NTP uses the primary IP address of the specified interface as the source IP address of the NTP
messages.
A device can act as a server to synchronize other devices only after it is synchronized. If a server has a
stratum level higher than or equal to a client, the client does not synchronize to that server.
In the ntp-service unicast-server command, ip-address must be a unicast address, rather than a
broadcast address, a multicast address or the IP address of the local clock.
To specify an NTP server on the 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.
You can configure multiple servers
by repeating the command. The
clients will select the optimal
reference source.