[7114] in North American Network Operators' Group
Re: Info on MAE-EAST
daemon@ATHENA.MIT.EDU (dave o'leary)
Fri Jan 17 17:50:20 1997
In-Reply-To: <v0300781faf03f12e46ed@[168.143.1.215]>
Date: Fri, 17 Jan 1997 14:17:51 -0800
To: "Howard C. Berkowitz" <hcb@clark.net>
From: "dave o'leary" <doleary@cisco.com>
Cc: "Dorian R. Kim" <dorian@cic.net>, "Brett L. Hawn" <blh@nol.net>,
Michael Dillon <michael@memra.com>, nanog@merit.edu
At 7:00 -0800 1/16/97, Howard C. Berkowitz wrote:
>I can't claim to have recent numbers that suggest otherwise, but, some
>historical information might at least be interesting. In the early 80s, I
>did a good deal of X.25 capacity planning. At what was then GTE Telenet,
>we found that up to 50% of our traffic stayed local in large cities. The
>larger the city, the more that seemed to stay local...this was especially
>obvious in New York, where a great deal of financial data flowed.
remember that in the early 80's you basically couldn't lease a T1
from AT&T (I think it was 82 or so when they were first tariffed?)
(watch out for that DC voltage...ouch! :-).
also DDS services were scarce, etc. So (expensive) low speed analog
was the option for leased lines - and private networks were rare.
Since then of course the fallout from Judge Greene has changed some
things, and it is cheap and easy to put up a DS0 across town - the
cost justification vs. per packet charges is a lot different.
>Now, these old statistics reflect mainframe-centric traffic, and more
>private-to-private than arbitrary public access. The latter is much more
>characteristic of Internet traffic.
>
>SNA and X.25 tended to emphasize the ability to fine tune access to a
>limited number of well-known resources, with relatively well-understood
>traffic patterns. The Internet, however, has emphasized arbitrary and
>flexible connectivity, possibly to the detriment of performance tuning and
>reliability.
well the strategies for performance tuning are certainly different.
[stuff cut]
>
>Web cacheing would seem to encourage traffic to stay local.
ahhh....yup.
dave
