Specifying the source interface for NTP messages

To prevent interface status changes from causing NTP communication failures, configure the device to use the IP address of an interface that is always up. For example, you can configure the device to use a loopback interface as the source IP address for the NTP messages to be sent.

When the device responds to an NTP request, the source IP address of the NTP response is always the IP address of the interface that has received the NTP request.

Follow these guidelines when you specify the source interface for NTP messages:

If you have specified the source interface for NTP messages in the ntp-service unicast-server/ntp-service ipv6 unicast-server or ntp-service unicast-peer/ntp-service ipv6 unicast-peer command, the specified interface acts as the source interface for NTP messages.
If you have configured the ntp-service broadcast-server or ntp-service multicast-server/ntp-service ipv6 multicast-server command in an interface view, this interface acts as the source interface for broadcast or multicast NTP messages.

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.

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