[c-nsp] NTP synchronization problems C2801

[Matthew Huff]

I would bet a bad clock crystal.


BTW, some of the ntp code won't kick in to correct time if there isn't a quorum, but I'm willing to bet your clock is too bad for even NTP to fix. One thing to check, is that router in a closet with cooling issues? Heat can cause the clock crystal to become erratic sometimes.



-----Original Message-----
From: Mack McBride [mailto:mack.mcbride at viawest.com] 
Sent: Tuesday, June 29, 2010 7:32 PM
To: Peter Rathlev; Matthew Huff
Cc: 'cisco-nsp at puck.nether.net'
Subject: RE: [c-nsp] NTP synchronization problems C2801

I would try using the same IOS version as the working one and see if it synchronizes 
(understand that might not be possible), that would tell you if it is hardware or software.
A bad clock crystal or capacitor will definitely cause problems but it could just be software.

Mack

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Peter Rathlev
Sent: Tuesday, June 29, 2010 4:48 PM
To: Matthew Huff
Cc: 'cisco-nsp at puck.nether.net'
Subject: Re: [c-nsp] NTP synchronization problems C2801

On Tue, 2010-06-29 at 18:37 -0400, Matthew Huff wrote:
> You need 3, preferably 4  NTP sources so that clients will work
> correctly. If you have 2, how does it know which one is a better
> source of time? 3 gives you a quorum, but if 1 fails, then you are
> back to 2. Four is the magic number.
> 
> Since you have 2 setup as strata 1, setup two boxes that use ntp
> sources on the internet as stratum 2 devices. Then set your cisco
> boxes to the 4 clients. That should make them more stable.

Though I tend to agree with the gist of that, I think the arguments are
irrelevant to my problem. The two sources are reachable (377 all the
time) and they agree to within acceptable error. Thus I don't need a
quorum. (I don't care about the failure scenario here.)

If both devices were the same I would just shrug and think the C2801
wasn't up to the job. But I have one device with no problems and another
acting up. Why is that? :-)

-- 
Peter


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