[ntp:questions] Number of Stratum 1 & Stratum 2 Peers

Mike Cook michael.cook at sfr.fr
Tue Dec 2 06:39:49 UTC 2014

> Le 2 déc. 2014 à 02:59, edstuart at gmail.com a écrit :
> Hi,
> I am looking to implement an NTP network and I was reading http://support.ntp.org/bin/view/Support/DesigningYourNTPNetwork.  It suggests 4 stratum 1 peers and 4 stratum 2 peers well.  I understand, that the document recommends this so that if one of the servers in a stratum dies, there will still be 3 servers from which a majority clique should be found.  The problem is that we will be starting out with simply 100 nodes at most.  
> At the same time, we want drift less than 1 second.  However, over the next 7 years or so, we should hit ~ 1000 NTP clients.  Is the document's recommendation overkill for my situation?

 The recommendation is really a minimum for whatever the number of clients that you are servicing, 1 or 1000. Fortunately, you don’t need to have all the upstream servers in your shop, unless you don’t allow connections to the internet. If you do, then with the latest versions on NTP you can use the pool for a minimal config in your top level servers, and serve the other clients locally from them. If you have a good view of the sky, then you could  use very cheap GPS sync’d stratum 1 servers in your top level. 1 second is not a difficult constraint. 

> Thanks,
> Ed Stuart
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