On Mon, Mar 31, 2014 at 03:02:37PM -0500, Ty Featherling wrote:
> I just went through my routers and was changing the NTP client settings. I
> have NTP servers on both of my edge Cisco routers. I added both as primary
> and secondary on all routers making sure to put the nearer router as
> primary on every one. Time and again I kept seeing the client report that
> it got it's update from the secondary server. The primary was available and
> in many cases was many hops nearer with faster response to boot. Is this
> some bug I have discovered? These routers are more likely to lose contact
> with their secondary NTP server than the primary; that is why I set them
> that way. So why chose the 2nd over the 1st?
The secondary may be at a lower (numerically) stratum because it's
reference clock is of a lower stratum.
I don't know if MikroTik is running ntpd or just ntpdate on a schedule,
or if they are even using the ntp.org software at all. I think both
ntp.org based options chose the "best" server rather than caring about
the order in which the possible servers are specified. I believe
stratum 1 is considered "better" than stratum 2 even if there is a bit
more network delay to reach the stratum 1 server.
Is it always the same Cisco being chosen?
Can you take out the further away Cisco and get time from the nearer
Cisco?
router-7204#show ntp status
Clock is synchronized, stratum 4, reference is xxx.yyy.34.40
nominal freq is 250.0000 Hz, actual freq is 249.9955 Hz, precision is 2**18
reference time is D6E468E3.2C713C80 (17:21:23.173 CDT Mon Mar 31 2014)
clock offset is 2.0125 msec, root delay is 90.61 msec
root dispersion is 41.40 msec, peer dispersion is 1.89 msec
router-7204#show ntp associations
address ref clock st when poll reach delay offset disp
+~xxx.yyy.34.35 67.18.187.111 3 871 1024 377 0.5 5.73 1.4
+~xxx.yyy.34.36 206.209.110.2 3 613 1024 377 0.7 -2.52 0.1
*~xxx.yyy.34.40 71.19.144.130 3 603 1024 377 0.6 -0.89 0.7
* master (synced), # master (unsynced), + selected, - candidate, ~ configured
Look at that output on both Ciscos and you will probably have your
answer.
--
Scott Lambert KC5MLE Unix SysAdmin
[email protected]
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