[c-nsp] NTP Server Recommendation?

[Daniska, Tomas]

Jasper,

actually it's not NMEA, it's been a long time ago since I noticed the feature :)

as per

http://www.cisco.com/en/US/partner/docs/ios/12_2/configfun/command/reference/frf012.html#wp1123799

two protocols are supported - Trimble Palisade and Telecom Solutions (and possibly other vendors talking those protocols)


you'll find more searching cco for the 'ntp refclock' command, enjoy ;-)



--

deejay


> -----Original Message-----
> From: Jasper Koolschijn [mailto:jkoolschijn at routit.nl]
> Sent: Monday, February 07, 2011 3:24 PM
> To: Daniska, Tomas
> Cc: Kimaru Mansour
> Subject: RE: [c-nsp] NTP Server Recommendation?
> 
> Hi Deejee,
> 
> I have been looking al over the internet but other than the HDSPA card
> for 3G networks is cant find an suitable IOS for NMEA Could you please
> give me some directions on where to find this option.
> 
> We sure would like to test the capability of the NMEA over the Cisco CPU
> to get an perfect time on the network. Like an Stratum 2.
> 
> Kind regards,
> 
> 
> Jasper Koolschijn
> 
> Technical Engineer
> Core Networking
> RoutIT BV
> Maxwellstraat 51
> 6716 BX Ede
> Phone: +31 (0) 88 437 2636
> Email: jasper at routit.nl
> Visit us @ www.routit.nl
> 
> 
> -----Oorspronkelijk bericht-----
> Van: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] Namens Daniska, Tomas
> Verzonden: maandag 7 februari 2011 10:21
> Aan: Michael Vinogradsky
> CC: cisco-nsp at puck.nether.net
> Onderwerp: Re: [c-nsp] NTP Server Recommendation?
> 
> 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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