95
ntp-service
[
ipv6
]
unicast-server
or
ntp-service
[
ipv6
]
unicast-peer
command works as
the source interface for NTP messages.
•
If you have configured the
ntp-service
broadcast-server
or
ntp-service
[
ipv6
]
multicast-server
command, the source interface for the broadcast or multicast NTP messages
is the interface configured with the respective command.
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-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 to receive NTP messages
When NTP is enabled, all interfaces by default can receive NTP messages. For security purposes,
you can disable some of the interfaces to receive NTP messages.
To disable an interface to receive 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 to
receive NTP messages.
•
For IPv4:
undo ntp-service inbound
enable
•
For IPv6:
undo ntp-service ipv6
inbound enable
By default, an interface receives
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 within about 12 minutes.
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.