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Re: The Gorgon's Knot. Was: Re: Verio Peering Question
From: "Vincent J. Bono" <vbono () vinny org>
Date: Fri, 28 Sep 2001 18:01:05 -0400


So we should throw away all the 7200s and similar routers today
because they are in the way of growing numbers of long prefixes,
replacing them with new routers manufactured since the time of
the above-mentioned lesson?

No.  Not at all.  But nor should we cry wolf and defend our corporate
policies with
phoney hysteria.  If you are filtering to keep your internal routing tables
clean fine, to
get the most out of your older or less than optimum equipment, fine too, but
don't say
the "the internet is in danger of imminent collapse if we don't do this"
either.

And when shall we throw away
the 12000s and similar routers (or components thereof) because
they are underpowered in the face of routing-table growth, compared
to well-established alternatives?

As soon as it becomes pratical.  But again, don't defend the (legitimate)
position
of wanting to get the most mileage out of your installed equipment base or
*not* wanting to spend millions of dollars on forklift expansion by saying
that
its for the good of the internet.  Although this is certainly the first time
I've seen
ivory tower idealism (aka nice clean routing tables with short allocations)
match
up to the goals of a real world corporation (aka lets encourage customers to
buy
our service and at the same time prolong the life of our core routers by a
year
or so).

Incidentally, the lesson learned was that sheer storage AMOUNT
is only a (perhaps small) part of the problem, compared to the
processing necessary to use that storage in support of dynamic
routing (in terms of CPU and in terms of accesses to that memory).

Historically router CPU technology has lagged behind the server industry, at
least
in raw processing capability.  Well, there was the fine machine made by Bay,
but
that proved beyond a shadow of a doubt that faster with more memory does not
a stable router make.  But that's a different thread.

-vb


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