I have a peculiar issue in my network with regards to NTP. the setup is that we have 6 sites that are connected through a WAN provided by an ISP. The sites run GET VPN for encryption. The NTP servers are PCs/servers that are located at one of the sites.
The issue is that most of my routers and switches receive the correct time from the master NTP server while a select few recieve the wrong time. Any ideas as to what might be causing this?
Here is an example of a site that recieves the correct time:
HQ#show ntp ass
address ref clock st when poll reach delay offset disp
~10.xxx.xxx.26 10.xxx.xxx.116 4 3 64 37 39.610 66.568 453.52
*~10.xxx.xxx.116 194.xxx.xxx.121 3 37 64 17 22.558 3.481 953.86
* sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
HQ#show ntp ass det
10.xxx.xxx.26 configured, sane, valid, stratum 4
ref ID xxx.xxx.xxx time D9ACCC7C.F6A5E5D8 (09:00:12.963 CET Wed Sep 23 2015)
our mode client, peer mode server, our poll intvl 64, peer poll intvl 64
root delay 69.73 msec, root disp 119.15, reach 37, sync dist 727.54
delay 39.61 msec, offset 66.5688 msec, dispersion 453.52
precision 2**6, version 4
org time D9ACCFF1.0A9DB4B1 (09:14:57.041 CET Wed Sep 23 2015)
rec time D9ACCFF0.FEA4FF35 (09:14:56.994 CET Wed Sep 23 2015)
xmt time D9ACCFF0.F4811BD4 (09:14:56.955 CET Wed Sep 23 2015)
filtdelay = 39.61 55.34 45.24 58.74 65.14 0.00 0.00 0.00
filtoffset = 66.56 62.44 40.01 37.13 22.21 0.00 0.00 0.00
filterror = 15.62 16.57 17.51 18.49 19.48 16000.0 16000.0 16000.0
minpoll = 6, maxpoll = 10
10.xxx.xxx.116 configured, our_master, sane, valid, stratum 3
ref ID 194.xxx.xxx.121, time D9ACCFCE.492CC1FF (09:14:22.285 CET Wed Sep 23 2015)
our mode client, peer mode server, our poll intvl 64, peer poll intvl 64
root delay 38.48 msec, root disp 47.95, reach 37, sync dist 601.95
delay 19.51 msec, offset 67.2878 msec, dispersion 453.96
precision 2**6, version 4
org time D9ACD011.092CC1FF (09:15:29.035 CET Wed Sep 23 2015)
rec time D9ACD010.FA72998F (09:15:28.978 CET Wed Sep 23 2015)
xmt time D9ACD010.F5735BB3 (09:15:28.958 CET Wed Sep 23 2015)
filtdelay = 19.51 43.92 57.10 83.80 22.55 0.00 0.00 0.00
filtoffset = 67.28 61.70 58.33 63.69 3.48 0.00 0.00 0.00
filterror = 15.62 16.61 17.60 18.59 19.55 16000.0 16000.0 16000.0
minpoll = 6, maxpoll = 10
And here is an example of a site that receives the wrong time form the NTP server:
Site6#show ntp ass
address ref clock st when poll reach delay offset disp
~10.xxx.xxx.26 10.xxx.xxx.116 4 42 64 377 0.000 -8.616 17.355
*~10.xxx.xxx.116 194.xxx.xxx.121 3 40 64 377 0.000 13.065 21.050
* sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
site6#show ntp ass det
10.xxx.xxx.26 configured, insane, invalid, stratum 4
ref ID 10.xxx.xxx.116, time D9ACD07C.F907BFE7 (07:17:16.972 UTC Wed Sep 23 2015)
our mode client, peer mode server, our poll intvl 64, peer poll intvl 64
root delay 0.06 msec, root disp 107.28, reach 377, sync dist 0.24
delay 0.00 msec, offset -8.6167 msec, dispersion 18.18
precision 2**6, version 4
org time D9ACD0DD.C9288483 (07:18:53.785 UTC Wed Sep 23 2015)
rec time D9ACD0DD.CE4A77A9 (07:18:53.805 UTC Wed Sep 23 2015)
xmt time D9ACD0DD.C9DD00C7 (07:18:53.788 UTC Wed Sep 23 2015)
filtdelay = 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01
filtoffset = -0.01 -0.00 -0.00 -0.00 0.00 0.00 0.00 0.00
filterror = 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02
minpoll = 6, maxpoll = 10
10.xxx.xxx.116 configured, our_master, sane, valid, stratum 3
ref ID 194.xxx.xxx.121, time D9ACCFCE.49ACDC6C (07:14:22.287 UTC Wed Sep 23 2015)
our mode client, peer mode server, our poll intvl 64, peer poll intvl 64
root delay 0.03 msec, root disp 50.36, reach 377, sync dist 0.14
delay 0.00 msec, offset 12.8248 msec, dispersion 20.65
precision 2**6, version 4
org time D9ACD0E0.CD83E6A9 (07:18:56.802 UTC Wed Sep 23 2015)
rec time D9ACD0E0.CE54FF0F (07:18:56.805 UTC Wed Sep 23 2015)
xmt time D9ACD0E0.C9DF8176 (07:18:56.788 UTC Wed Sep 23 2015)
filtdelay = 0.01 0.01 0.01 0.01 0.01 0.01 0.02 0.01
filtoffset = 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.01
filterror = 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02
minpoll = 6, maxpoll = 10
thanks in advance
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