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HP FlexFabric 12500 Series Network Management And Monitoring Command Reference Page 118

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[ authentication-keyid keyid | source interface-type interface-number | version number ] *
undo sntp unicast-server { server-name | ip-address } [ vpn-instance vpn-instance-name ]
No NTP server is specified for the device.
System view
Predefined user roles
server-name: Specifies the host name of the NTP server, a case-insensitive string of 1 to 253 characters.
ip-address: Specifies an IP address of the NTP server. 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 MPLS L3VPN to which the NTP server belongs, where
vpn-instance-name 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,
where keyid is in the range of 1 to 4294967295. If the option is not specified, the local device and NTP
server do not authenticate each other.
source 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 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
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.
# Specify NTP server for the device, and configure the device to run NTP version 4.
<Sysname> system-view
[Sysname] sntp unicast-server version 4
Related commands
sntp authentication enable


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