1、配置/etc/ntp.conf文件，添加NTP服务器地址信息（server 192.168.1.20）
broadcastclient
driftfile /etc/ntp.drift
tracefile /etc/ntp.trace
server 192.168.1.20
2、启动xntpd进程
方法1： # startsrc -s xntpd 0513-059 The xntpd Subsystem has been started. Subsystem PID is 327788. 方法2： # smit xntpd 选择“Start Using the xntpd Subsystem”--“BOTH”
3、检查xntpd服务状态
# lssrc -ls xntpd
Program name: /usr/sbin/xntpd
Version: 3
Leap indicator: 11 (Leap indicator is insane.)
Sys peer: no peer, system is insane
Sys stratum: 16
Sys precision: -18
Debug/Tracing: DISABLED
Root distance: 0.000000
Root dispersion: 0.000000
Reference ID: no refid, system is insane
Reference time: no reftime, system is insane
Broadcast delay: 0.003906 (sec)
Auth delay: 0.000122 (sec)
System flags: bclient pll monitor filegen
System uptime: 80 (sec)
Clock stability: 0.000000 (sec)
Clock frequency: 0.000000 (sec)
Peer: 192.168.1.20
flags: (configured)
stratum: 3, version: 3
our mode: client, his mode: server
Subsystem Group PID Status
xntpd tcpip 172176 active
4、使用ntpdate手动与NTP服务器同步
# ntpdate -d 192.168.1.20
17 Nov 10:37:59 ntpdate[131094]: 3.4y
transmit(192.168.1.20)
receive(192.168.1.20)
transmit(192.168.1.20)
receive(192.168.1.20)
transmit(192.168.1.20)
receive(192.168.1.20)
transmit(192.168.1.20)
receive(192.168.1.20)
transmit(192.168.1.20)
server 192.168.1.20, port 123
stratum 3, precision -6, leap 00, trust 000
refid [64.4.10.33], delay 0.04146, dispersion 0.00026
transmitted 4, in filter 4
reference time: d813d221.52a70817 Sun, Nov 16 2014 19:47:13.322
originate timestamp: d813ec37.25da3b4a Sun, Nov 16 2014 21:38:31.147
transmit timestamp: d814a2e7.2a0bd000 Mon, Nov 17 2014 10:37:59.164
filter delay: 0.04167 0.04150 0.04146 0.04146
0.00000 0.00000 0.00000 0.00000
filter offset: -46768.0 -46768.0 -46768.0 -46768.0
0.000000 0.000000 0.000000 0.000000
delay 0.04146, dispersion 0.00026
offset -46768.016225
17 Nov 10:37:59 ntpdate[131094]: step time server 192.168.1.20 offset -46768.016225