HPE FlexNetwork 10500 Series Network Management And Monitoring Command Reference page 143

Use undo sntp ipv6 unicast-server to remove the IPv6 NTP server specified for the device.
Syntax
sntp ipv6 unicast-server { server-name | ipv6-address } [ vpn-instance vpn-instance-name ]
[ authentication-keyid keyid | source interface-type interface-number ] *
undo sntp ipv6 unicast-server { server-name | ipv6-address } [ vpn-instance vpn-instance-name ]
Default
No IPv6 NTP server is specified.
Views
System view
Predefined user roles
network-admin
mdc-admin
Parameters
server-name: Specifies an NTP server by its host name, a case-insensitive string of 1 to 253
characters.
ipv6-address: Specifies an NTP server by its IPv6 address.
vpn-instance vpn-instance-name: Specifies MPLS L3VPN instance 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.
source interface-type interface-number: Specifies the source interface for IPv6 NTP messages. If
the specified IPv6 NTP server address is not a link local address, the source IPv6 address for IPv6
NTP messages sent by the local device to the NTP server is the IPv6 address of the specified source
interface. If the specified IPv6 NTP server address is a link local address, the IPv6 NTP messages
are sent from the specified source interface, and the source address of the messages is the link local
address of the interface. The interface-type interface-number argument represents the interface type
and number. If you do not specify an interface, the device automatically selects the source IPv6
address of IPv6 NTP messages. For more information, see RFC 3484.
Usage guidelines
When you specify an IPv6 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 instance, provide the vpn-instance
vpn-instance-name option 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 in the specified VPN instance. If you do not
include the vpn-instance vpn-instance-name option in the command, the command removes the
NTP server on the public network.
If the specified IPv6 address of the NTP server is a link local address, you must specify the source
interface for NTP messages and cannot specify a VPN instance for the NTP server.
Examples
# Specify the IPv6 NTP server 2001::1 for the device.
<Sysname> system-view
[Sysname] sntp ipv6 unicast-server 2001::1
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