H3C Technologies H3C WX5500E Series Access Controllers - Manual (Page 25)

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Configuration guidelines
• The source interface for NTP unicast messages is the interface specified in the ntp-service
unicast-server or ntp-service unicast-peer command.
• The source interface for NTP broadcast or multicast messages is the interface where you configure
the ntp-service broadcast-server or ntp-service multicast-server command.
• If the specified source interface goes down, NTP uses the primary IP address of the outgoing
interface as the source IP address.
Configuration procedure
To specify the source interface for NTP messages:
Step Command Remarks
1. Enter system view. system-view N/A
2. Specify the source interface
for NTP messages. ntp-service source-interface
interface-type interface-number
By default, no source interface is
specified for NTP messages, and
the system uses the IP address of
the interface determined by the
matching route as the source IP
address of NTP messages.
Disabling an interface from receiving NTP messages
If NTP is enabled, NTP messages can be received from all interfaces by default. You can disable an
interface from receiving NTP messages by using the following configuration.
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter VLAN interface view.
interface interface-type
interface-number
N/A
3. Disable the interface from
receiving NTP messages.
ntp-service in-interface disable
By default, an interface is enabled
to receive NTP messages.
Configuring the allowed maximum number of dynamic
sessions
NTP has the following types of associations:
• Static association—An association that a user has manually created by using an NTP command.
• Dynamic association—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 period of time.
The following describes how an association is established in different operation modes:
• Client/server mode—After you specify an NTP server, the system creates a static association on the
client. The server simply responds passively upon the receipt of a message, rather than creating an
association (static or dynamic).