NTP (network time protocol) 
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SW1 F0/0-------------------------F0/0 SW2
配置NTP，使两台交换机的时钟同步。其中SW1为SERVER端，SW2为CLIENT端
初始配置 SW1: conf t int f 0/0 no switchport ip ad 10.1.1.1 255.255.255.0 no shut end SW2 conf t int f 0/0 no switchport ip ad 10.1.1.2 255.255.255.0 no shut end 开始配置NTP sw1 conf t ntp authenticate /启用NTP验证 ntp authentication-key 8 md5 CCIE /设置NTP验证码为CCIE ntp trusted-key 8 /防止意外的同步发生 ntp master /设置master交换机，master值默认为8，范围 1～15。此命令只需在SERVER上配置 ntp peer 10.1.1.2 key 8 /对端为CLIENT,与对端交换机建立关联 exit SW2 conf t ntp authenticate ntp authentication-key 8 md5 CCIE ntp truster-key 8 ntp server 10.1.1.1 key 8 /对端为SERVER，与对端交换机建立关联 exit 校验 sw1#sh ntp s Clock is synchronized, stratum 8, reference is 127.127.7.1 nominal freq is 250.0000 Hz, actual freq is 250.0000 Hz, precision is 2**18 reference time is CC468192.A7EE6D49 (08:25:54.655 UTC Fri Aug 8 2008) clock offset is 0.0000 msec, root delay is 0.00 msec root dispersion is 0.02 msec, peer dispersion is 0.02 msec SW2#sh ntp s Clock is synchronized, stratum 9, reference is 10.1.1.1 nominal freq is 250.0000 Hz, actual freq is 250.0001 Hz, precision is 2**18 reference time is CC468263.D88EF525 (08:29:23.845 UTC Fri Aug 8 2008) clock offset is -61.8452 msec, root delay is 183.73 msec root dispersion is 15936.90 msec, peer dispersion is 15875.02 msec 目前两端交换机已同步 进入SW1的特权模式，输入命令 clock set 6:40:10 4 january 2007 sw1#sh ntp s Clock is synchronized, stratum 8, reference is 127.127.7.1 nominal freq is 250.0000 Hz, actual freq is 250.0000 Hz, precision is 2**24 reference time is C9472369.CFDE1E75 (06:55:37.811 UTC Thu Jan 4 2007) clock offset is 0.0000 msec, root delay is 0.00 msec root dispersion is 0.02 msec, peer dispersion is 0.02 msec 来看SW2的校验 sw2#sh ntp s Clock is unsynchronized, stratum 16, no reference clock nominal freq is 250.0000 Hz, actual freq is 249.9997 Hz, precision is 2**18 reference time is CC468723.B9593587 (08:49:39.724 UTC Fri Aug 8 2008) clock offset is 17.8636 msec, root delay is 51.80 msec root dispersion is 53.50 msec, peer dispersion is 35.61 msec 现在是没有同步的，因为在SW1上刚做了新的时间配置， 在SW2上输入 show run | include clock-period命令 SW2#sh run | include clock-period ntp clock-period 17179889 /17179889表示SW2更新时钟的时间间隔。单位是MS 过一段时间后再在SW2上输入 sh ntp status SW2#sh ntp s Clock is synchronized, stratum 9, reference is 10.1.1.1 nominal freq is 250.0000 Hz, actual freq is 249.9997 Hz, precision is 2**18 reference time is C9472162.E919F71E (06:46:58.910 UTC Thu Jan 4 2007) clock offset is 3.6307 msec, root delay is 131.81 msec root dispersion is 8258.48 msec, peer dispersion is 7879.84 msec 表明时钟已和SW1同步 本文出自 “穿过地狱去看海” 博客，谢绝转载！ 本文出自 51CTO.COM技术博客 |
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