H3c-technologies H3C WX5500E Series Access Controllers Manuel d'utilisateur télécharger pdf (Page 25)

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:

Ste

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.

Ste

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).

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