我想将 Cisco 交换机 (ws-C3560x) 的时间与 AD 服务器同步。进行以下配置后，时间未同步。请指导。
#show running-config | include ntp
ntp logging
ntp server 150.153.0.1
#show ntp associations detail
150.153.0.1 configured, insane, invalid, stratum 1
ref ID .LOCL., time DEB7AE26.A40A8163 (15:47:02.640 utc Tue May 29 2018)
our mode client, peer mode server, our poll intvl 64, peer poll intvl 64
root delay 0.00 msec, root disp 10725.96, reach 3, sync dist 10746.93
delay 1.73 msec, offset -1498763705.0000 msec, dispersion 15.69
precision 2**6, version 4
org time DEB89DE5.542B45FE (08:49:57.328 utc Wed May 30 2018)
rec time D13E13FE.595759A8 (01:41:34.348 utc Thu Mar 31 2011)
xmt time D13E13FE.58A6DEAF (01:41:34.346 utc Thu Mar 31 2011)
filtdelay = 2.69 2.96 2.04 2.45 1.73 2.39 1.73 2.82
filtoffset = -149876 -149876 -149876 -149876 -149876 -149876 -149876 -149876
filterror = 15.63 15.66 15.69 15.72 15.75 15.78 15.81 15.84
minpoll = 6, maxpoll = 10
#show ntp status
Clock is unsynchronized, stratum 16, no reference clock
nominal freq is 190.7348 Hz, actual freq is 190.7348 Hz, precision is 2**17
reference time is 00000000.00000000 (05:00:00.000 utc Mon Jan 1 1900)
clock offset is 0.0000 msec, root delay is 0.00 msec
root dispersion is 1.42 msec, peer dispersion is 0.00 msec
loopfilter state is 'FSET' (Drift set from file), drift is 0.000000000 s/s
system poll interval is 64, never updated.
答案1
路由器上的本地时间必须与 NTP 服务器时间相差 4000 秒以内，NTP 才能同步。差异太大，NTP 无法同步。
您还可以启用debug ntp validity以获取有关为什么您的 NTP 源不被视为有效的更多信息，但在您的情况下，这显然是一个非常高的时钟差异。