113
Default
No NTP server is specified.
Views
System view
Predefined user roles
network-admin
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-name argument 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-keyid keyid: Specifies the key ID to be used for sending NTP messages to the NTP
server. The value range for the keyid argument is 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.
Source interface-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-number argument represents 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.
Version number: Specifies the NTP version. The value range for the number argument 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 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 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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