HP 6125XLG R2306-HP 6125XLG Blade Switch Network Management and Monitoring Con - Page 32

Disabling an interface from receiving NTP messages

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To specify the source interface for NTP messages: Step 1. Enter system view. 2. Specify the source interface for NTP messages. Command Remarks system-view N/A • Specify the source interface for NTP messages: ntp-service source-interface interface-type interface-number By default, no source interface is • Specify the source interface for specified for NTP messages. IPv6 NTP messages: ntp-service ipv6 source interface-type interface-number Disabling an interface from receiving NTP messages When NTP is enabled, all interfaces by default can receive NTP messages. For security purposes, you can disable some of them from receiving NTP messages. To disable an interface from receiving NTP messages: Step 1. Enter system view. 2. Enter interface view. 3. Disable the interface from receiving NTP messages. Command system-view interface interface-type interface-number • For IPv4: ntp-service inbound disable • For IPv6: ntp-service ipv6 inbound disable Remarks N/A N/A By default, an interface is enabled to receive NTP messages. Configuring the maximum number of dynamic associations 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 association 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. • Broadcast or multicast mode-Static associations are created on the server, and dynamic associations are created on the client. 26

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26
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.
•
Specify the source interface for
NTP messages:
ntp-service source-interface
interface-type interface-number
•
Specify the source interface for
IPv6 NTP messages:
ntp-service ipv6 source
interface-type interface-number
By default, no source interface is
specified for NTP messages.
Disabling an interface from receiving NTP messages
When NTP is enabled, all interfaces by default can receive NTP messages. For security purposes, you
can disable some of them from receiving NTP messages.
To disable an interface from receiving NTP messages:
Step
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.
•
For IPv4:
ntp-service inbound disable
•
For IPv6:
ntp-service ipv6 inbound
disable
By default, an interface is enabled
to receive NTP messages.
Configuring the maximum number of dynamic associations
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 association 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.
•
Broadcast or multicast mode
—Static associations are created on the server, and dynamic
associations are created on the client.