73Step Command Remarks2. Specify an NTP server for thedevice.• Specify an NTP server for thedevice:ntp-service unicast-server{ server-name | ip-address }[ vpn-instancevpn-instance-name ][ authentication-keyid keyid |priority | source interface-typeinterface-number | versionnumber ] *• Specify an IPv6 NTP server forthe device:ntp-service ipv6 unicast-server{ server-name | ipv6-address }[ vpn-instancevpn-instance-name ][ authentication-keyid keyid |priority | source interface-typeinterface-number ] *By default, no NTP server isspecified for the device.Configuring NTP in symmetric active/passive modeWhen the device operates in symmetric active/passive mode, specify on a symmetric-active peer the IPaddress for a symmetric-passive peer.Follow these guidelines when you configure a symmetric-active peer:• Execute the ntp-service enable command on a symmetric passive peer to enable NTP. Otherwise,the symmetric-passive peer will not process NTP messages from a symmetric-active peer.• Either the symmetric-active peer, or the symmetric-passive peer, or both of them must be insynchronized state. Otherwise, their time cannot be synchronized.• You can configure multiple symmetric-passive peers by repeating the ntp-service unicast-peer orntp-service ipv6 unicast-peer command.To configure a symmetric-active peer:Step Command Remarks1. Enter system view. system-view N/A
