F3726, F3211, F3174, R5135, R3816-HP Firewalls and UTM Devices System Management and Maintenance Configuration Guide-6PW100

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414BConfiguration 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.
415BConfiguration procedure
To specify the source interface for NTP messages:
Ste
p
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.
241BDisabling an interface from receiving NTP messages
If NTP is enabled, NTP messages can be received from all the interfaces by default, and you can disable
an interface from receiving NTP messages through the following configuration.
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter 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.
242BConfiguring the allowed maximum number of dynamic
sessions
NTP has the following types of associations:
• Static association—A manually created association.
• Dynamic association—Temporary association created by the system during NTP operation. A
dynamic association is removed if no messages are exchanged 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).
• Symmetric active/passive mode—After you specify a symmetric-passive peer on a symmetric active
peer, static associations are created on the symmetric-active peer, and dynamic associations are
created on the symmetric-passive peer.