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Parameters
server-name: Specifies an NTP server by its host name, a case-insensitive string of 1 to 253
characters.
ip-address: Specifies an NTP server by its IP address. It must be a unicast address, rather than a
broadcast address, a multicast address, or the IP address of the local clock.
vpn-instance vpn-instance-name: Specifies the VPN to which the NTP server belongs. The
vpn-instance-nameargument is a case-sensitive string of 1 to 31 characters. If the NTP server is on
the public network, do not specify this option.
authentication-keyidkeyid: Specifies the key ID to be used for sending NTP messages to the NTP
server. The value range for the keyidargumentis 1 to 4294967295. If you do not specify this option,
the local device and NTP server do not authenticate each other.
priority: Specifies this NTP server as the first choice under the same condition.
sourceinterface-type interface-number: Specifies the source interface for NTP messages. For 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-numberargumentrepresents the interface type
and number.If you do not specify this option, the device searches the routing table for the outgoing
interface and uses the primary IP address of the outgoing interface as the source IP address of the
NTP messages.
versionnumber: Specifies the NTP version. The value range for thenumberargument is 1 to 4. The
default value is 4.
Usage guidelines
When you specify an NTP server for the device, the device is synchronized to the NTP server, but the
NTP server is not synchronized to the device.
To synchronize the PE to a PE or CE in a VPN, provide vpn-instance vpn-instance-name in your
command.
If you include thevpn-instance vpn-instance-nameoption 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 thevpn-instance vpn-instance-nameoption in the command, the
command removes the NTP server with the IP address of ip-address in the public network.
Examples
# Specify NTP server 10.1.1.1 for the device, and configure the device to run NTP version 4.
<Sysname> system-view
[Sysname] ntp-service unicast-server 10.1.1.1 version 4
Related commands
ntp-service authentication enable
ntp-service authentication-keyid
ntp-service reliable authentication-keyid
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