[50212] in North American Network Operators' Group
RE: PSINet/Cogent Latency
daemon@ATHENA.MIT.EDU (Alex Rubenstein)
Mon Jul 22 22:03:06 2002
Date: Mon, 22 Jul 2002 22:01:36 -0400 (Eastern Daylight Time)
From: Alex Rubenstein <alex@nac.net>
To: Phil Rosenthal <pr@isprime.com>
Cc: "nanog@merit.edu" <nanog@merit.edu>
In-Reply-To: <!~!UENERkVCMDkAAQACAAAAAAAAAAAAAAAAABgAAAAAAAAA/zNkI7d3EEmn3+v5DgN/l8KAAAAQAAAAz9j8MclBhE6QfPAeWqDvQgEAAAAA@isprime.com>
Errors-To: owner-nanog-outgoing@merit.edu
On Mon, 22 Jul 2002, Phil Rosenthal wrote:
>
> I call any upstream link 'over capacity' if either:
> 1) There is less than 50mb/s unused
That must work well for T1's and DS3's.
> 2) The circuit is more than 50% in use
I call it 'over capacity' too, but that doesn't mean all the ducks are in
a row to get both sides to realise an upgrade is needed, and even if they
do realise it, to actually get it done. I am sure 2238092 people on this
list can complain of the same problem.
So, what do you do? You monitor it's usage, making adjustments to make
sure it doesn't get clobbered. You can easily run DS-3s at 35 to 40
mbit/sec, with little to none increase in latency from the norm. Many
people do this as well, even up to OC12 or higher levels all the time.
> I guess by my definition a DS3 is always 'over capacity'
Which must work very well for those DS3's doing 10 to 20 mb/s. Do you
upgrade those to OC3 or beyond?
-- Alex Rubenstein, AR97, K2AHR, alex@nac.net, latency, Al Reuben --
-- Net Access Corporation, 800-NET-ME-36, http://www.nac.net --
