[79808] in North American Network Operators' Group
N+? redundancy
daemon@ATHENA.MIT.EDU (Michael.Dillon@radianz.com)
Fri Apr 15 09:31:09 2005
In-Reply-To: <200504151259.IAA22514@sigma.nrk.com>
To: nanog@merit.edu
From: Michael.Dillon@radianz.com
Date: Fri, 15 Apr 2005 14:31:19 +0100
Errors-To: owner-nanog@merit.edu
> And I agree re: the building entrance issue and later choke points.
> Anyone recall the time several years ago that most of the Valley was
> isolated? One route was across the ?Bay? Bridge; it was down for
> planned maintenance when backhoe fade struck around San Jose.
> How many paths is enough?
In my opinion, the following rule of thumb is reasonable.
1 path is enough for a site/enterprise that shuts
down its services evenings and weekends.
2 paths is enough for a site/enterprise that provides
a 24 hour, 7 day per week service.
3 paths is enough for a population center with under
a million inhabitants.
5 paths is enough for a population center with over
a million inhabitants.
And a very few population centers such as New York,
London, Tokyo, and Cheyenne Mountain should probably
have more than 5 paths.
--Michael Dillon
