[c-nsp] NTP Server

[Stephen J. Wilcox]

Hi Steven,
 depends what you need it for.. if you take references from at least 3 external 
sources and run maybe 3 of your core routers this way, you can happily sync the 
rest of your routers from these. You will get a very accurate sync and will 
limit your load on the external servers.

If you want to accurately run a stratum 0/1 source then you need dedicated 
hardware + GPS etc but most applications dont need this.

Steve

On Mon, 13 Sep 2004, Baek, Steven A (US SSA) wrote:

> Thanks for the replies. It looks like our Cisco devices aren't going to
> be the right solution for this job. An external time source will be used
> as a better reference.
> 
> Steve
> 
> -----Original Message-----
> From: Bill Brunton [mailto:bbrunton at icu.net] 
> Sent: Monday, September 13, 2004 2:08 PM
> To: Annu Roopa
> Cc: Baek, Steven A (US SSA); cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] NTP Server
> 
> 
> Most ntp servers and some clients permit you to monitor several servers.
> 
> The ntp clients then will analyze the status of each server, and 
> synchronize to the most accurate reliable server. So if the Cisco is not
> 
> available, or is unreliable, it will not be used unless all more
> reliable 
> ones are unavailable.
> 
> 
> On Mon, 13 Sep 2004, Annu Roopa wrote:
> 
> > Date: Mon, 13 Sep 2004 13:58:08 -0700 (PDT)
> > From: Annu Roopa <annu_roopa at yahoo.com>
> > To: "Baek, Steven A (US SSA)" <steven.baek at baesystems.com>,
> >      cisco-nsp at puck.nether.net
> > Subject: Re: [c-nsp] NTP Server
> > 
> > Baek,
> >  
> > As i know most of the Cisco devices can act as a NTP server. The most
> important Q
> >  one has to ask is will they be reliable ? The reason is many of these
> boxes dont have
> >  an internal clock, so once u set the time and date and make them the
> server the others
> >  will have it.When the box fails NTP will not be there for any of the
> boxes and also the
> >  time/date need to be reset.
> >  
> > Also some of the boxes depending on the code wont be able to update
> there calendar
> > etc, so u might want to look at these. In a small setup and or lab
> setup this should work
> > fine.
> >  
> > Any other thoughts ?
> >  
> > HTH.
> > 
> > Annu.
> > 
> > "Baek, Steven A (US SSA)" <steven.baek at baesystems.com> wrote:
> > Does anyone happen to know if the 3500 or 6500 series switches can act
> > as an NTP server?
> > 
> > Thanks,
> > 
> > 
> > 
> > Steve
> > 
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