29Default level3: Manage levelParametersvpn-instance vpn-instance-name: Specifies the MPLS L3VPN to which the symmetric-passive peer belongs,where vpn-instance-name is a case-sensitive string of 1 to 31 characters. If the symmetric-passive peer ison the public network, do not specify this option.peer-name: Host name of the symmetric-passive peer, a string of 1 to 20 characters.authentication-keyid keyid: Specifies the key ID to be used for sending NTP messages to the peer, wherekeyid is in the range of 1 to 4294967295.priority: Specifies the peer designated by ip-address or peer-name as the first choice under the samecondition.source-interface interface-type interface-number: Specifies the source interface for NTP messages. In anNTP message that the local device sends to its peer, the source IP address is the primary IP address of thisinterface. interface-type interface-number represents 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.DescriptionUse the ntp-service unicast-peer command to designate a symmetric-passive peer for the device.Use the undo ntp-service unicast-peer command to remove the symmetric-passive peer designated for thedevice.By default, no symmetric-passive peer is designated for the device.NOTE:• To synchronize the PE to a PE or CE in a VPN, provide vpn-instancevpn-instance-name in yourcommand.• If you include vpn-instancevpn-instance-name in the undo ntp-service unicast-peer command, thecommand removes the symmetric-passive peer with the IP address ofip-address in the specified VPN. Ifyou do not include vpn-instancevpn-instance-name in this command, the command removes thesymmetric-passive peer with the IP address ofip-address in the public network.Examples# Designate the device with the IP address of 10.1.1.1 as the symmetric-passive peer of the device,configure the device to run NTP version 3, and specify the source interface of NTP messages asVLAN-interface 1. system-view[Sysname] ntp-service unicast-peer 10.1.1.1 version 3 source-interface vlan-interface 1ntp-service unicast-serverSyntaxntp-service unicast-server [ vpn-instance vpn-instance-name ] { ip-address | server-name }[ authentication-keyid keyid | priority | source-interface interface-type interface-number | versionnumber ] *undo ntp-service unicast-server [ vpn-instance vpn-instance-name ] { ip-address | server-name }
