[c-nsp] NTP Server Recommendation?

[Daniska, Tomas]

some time ago i have noticed that IOS is to support NMEA over async ports, so one can buy an inexpensive GPS receiver and gets a perfect synchronized clock... but never managed to try it out myself

--

deejay

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Michael Vinogradsky
> Sent: Sunday, February 06, 2011 6:27 PM
> To: Phil Mayers
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] NTP Server Recommendation?
> 
> So 3 it will be. I'll probably go with cisco routers. I appreciate the
> feedback!
> 
> On Feb 5, 2011, at 7:19 PM, "Phil Mayers" <p.mayers at imperial.ac.uk>
> wrote:
> 
> > On 02/05/2011 11:32 PM, Michael Vinogradsky wrote:
> >> The design would be comprised of two redundant NTP server in separate
> >> geographic locations. The budget in the ballpark of two 2800 routers.
> >> Precision is not that important.
> >
> > Two NTP servers is a bad number. If one malfunctions... how does a
> > client know which one to trust? Have at least 3.
> >
> > I would recommend ntpd on a Linux box or boxes. It will handle very
> high
> > numbers of NTP clients and is the reference implementation, with very
> > comprehensive config guides.
> >
> > Unless you have very specialist needs, it is unlikely you need a local
> > clock source; there are almost certainly good local tier1 NTP servers
> > you can sync to (pick at least 5; have each of your at-least-3 local
> > servers act as client to them, and peer to each other)
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