[arin-ppml] Routing Scaling Problems

Aaron dudepron at gmail.com
Tue Sep 2 10:41:23 EDT 2008

Wouldn't that just bring us full circle? Filtering /20 and longer brings
back some memories..


On Tue, Sep 2, 2008 at 1:47 AM, John Curran <jcurran at istaff.org> wrote:

> On Sep 1, 2008, at 9:42 PM, Robin Whittle wrote:
> >
> > Short version:   I think that the routing scaling problems will not
> >                 be so severe as to lead to widespread IPv6-only
> >                 adoption in the foreseeable future.
> >
> >                 The only routers which will be affected
> >                 significantly by the growing number of DFZ routes
> >                 will be those of transit providers and large ISPs
> >                 where the routers have the highest number of
> >                 neighbours.  I believe the operators of those
> >                 routers will always find it better to upgrade or
> >                 replace those routers, or to limit the number of
> >                 neighbours they connect to, rather than drop some
> >                 DFZ routes and therefore provide a second-rate
> >                 service.
> "Second-rate" service is a matter of perspective, since the
> alternative of continuously upgrading all of the DFZ routers
> in a major transit-free ISP (presuming the equipment of that
> scale is even available) means enormous capital expenditures,
> and to do so solely because other providers are filling up
> routing tables with fragments would require some interesting
> financial justifications in any company.
> Given that some providers are already having trouble keeping
> up, is it your assumption that all "tier one" providers simply
> have no choice, and pass along these ever increasing costs to
> their existing customers?  It would only take one backbone ISP
> to opt instead to drop "less popular" routes and have much lower
> costs to make for some very interesting competitive pressure.
> /John
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