Faster 'Net growth rate raises fears about routers

Roeland Meyer rmeyer at
Tue Apr 3 18:55:27 UTC 2001

Sorry, I thought we were discussing all multi-homing. Your example doesn't
help the business whose ISP suffers a business failure (such as DSLnetworks,
Flashpoint, et al), only the case where the access provider fails SLA.

To put it bluntly, a single circuit, to a single business, while annoying,
doesn't cause wide-spread outages when it fails. It is thus, the
lesser-order case. The case I thought was under discussion is when an ISP
dumps something on the order of 10^3 or more customers when they fail. I
understand that NorthPoint abandoned 
~100,000 customers when they sold their backbone to AT&T and AT&T didn't
pick up the subscribers. I will wager that many of them were /24s.
DSLnetworks had over 700 Covad customers, FlashPoint was larger. For various
definitions of "wide-spread", this is a much larger issue than a broken
copper-pair. I suspect that it also has a much higher likelyhood of
occurance. Especially, in the current business shakeout.

Guess what ... it won't stop. This sort of problem will be with us forever.
We should find a solution ... someday ... ya think?

Business failures are on one side of the problem and CIDR aggregation is on
the other.

> -----Original Message-----
> From: RJ Atkinson [mailto:rja at]
> Sent: Tuesday, April 03, 2001 11:26 AM
> To: Roeland Meyer
> Cc: nanog at
> Subject: RE: Faster 'Net growth rate raises fears about routers
> At 13:55 03/04/01, Roeland Meyer wrote:
> >The problem with this, if done, is that we back right into 
> the other problem
> >of prefix filtering. 
>         No.  These are separate tail circuits to separate POPs
> of the same ISP.  So that one ISP only needs to advertise its
> fully aggregated prefix.  So the problem you postulate does
> not arise in this particular situation.
> > What is the other ISP to do? 
>         You didn't read closely enough.  2 tail circuits,
> 2 POPs, but only 1 ISP was the scenario outlined.  It works
> quite well, provided one picks the ISP thoughtfully.
> Ran

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