3Com MSR 50 Designated for the device, No NTP server is designated for the device by default

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authentication-keyidkeyid: 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-interfaceinterface-type interface-number: Specifies an interface for
	sending 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.
	interface-typeinterface-numberrepresents the interface type and number.
	version number: Specifies the NTP version, where number is in the range of 1 to 3
	and defaults to 3.
Description	Use the ntp-serviceunicast-servercommand to designate an NTP server for
	the device.
	Use the undo ntp-serviceunicast-servercommand to remove an NTP server
	designated for the device.
	No NTP server is designated for the device by default.
n	■ If you specify a VPN instance name, this VPN must exist, and at least one local
	interface and the NTP server coexist in this VPN.
	■ If multiple VPNs have been configured on the PE and you want to synchronize
	the PE to a PE or CE in one of these VPNs, you need to provide vpn-instance
	vpn-instance-name in your command.
	■ If you include vpn-instancevpn-instance-name in the undo ntp
	unicast-servercommand, the command will remove the NTP server with the
	IP address of ip-address in the specified VPN; if you do not include
	vpn-instancevpn-instance-name in this command, the command will remove
	the NTP server with the IP address of ip-address in the public network.
Example	# Designate the device with the IP address of as 10.1.1.1 an NTP server for the
	device.
	<Sysname> system-view
	[Sysname] ntp-service unicast-server 10.1.1.1 version 3