HP VPN Firewall Appliances System Management and Maintenance Command Reference

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authentication-keyid keyid: Specifies the key ID to be used for sending NTP messages to the NTP server,
where keyid is in the range of 1 to 4294967295.
priority: Specifies this NTP server as the first choice under the same condition.
source-interface interface-type interface-number: Specifies the source interface for NTP messages. In an
NTP message the local device sends to the NTP server, the source IP address is the primary IP address of
this interface. The interface-type interface-number argument represents the interface type and number.
version number: Specifies the NTP version. The value range for the number argument is 1 to 4, and the
default is 3.
Usage guidelines
To synchronize the PE to a PE or CE in a VPN, specify the vpn-instance vpn-instance-name option in the
command.
If you include the vpn-instance vpn-instance-name option in the undo ntp-service unicast-server
command, the command removes the NTP server with the IP address of ip-address in the specified VPN.
If you do not include the vpn-instance vpn-instance-name option in this command, the command removes
the NTP server with the IP address of ip-address in the public network.
Examples
# Designate NTP server 10.1.1.1 for the device, and configure the device to run NTP version 3.
<Sysname> system-view
[Sysname] ntp-service unicast-server 10.1.1.1 version 3