No subject
Vadim Antonov
avg at kotovnik.com
Tue Jan 9 02:48:33 UTC 2001
There's another option for IXP architecture, virtual routers over a
scalable fabric. This is the only approach which combines capacity of
inverse-multiplexed parallel L1 point-to-point links and flexibility of
L2/L3 shared-media IXPs. The box which can do that is in field trials
(though i'm not sure the current release of software supports that
functionality).
--vadim
On Tue, 9 Jan 2001, Masataka Ohta wrote:
>
> Randy;
>
> > > BGP Route Reflector IXPs need a AS number. I'll send you a URL with a
> > > whitepaper. The BGP Route Reflector IXPs have proved to offer a low entry
> > > cost for ISPs (for those places that do not have the deep pockets to get
> > > big routers).
> >
> > except that big routers are not needed for small-isp exchanges. remember,
> > an isp participating in such an exchange has only to add the prefixes of
> > their local peers to their routing, typically a dozen or so. there are very
> > successful layer-two exchanges where the peers use what we think of as cpe
> > routers, e.g. cisco 2501s. and what's nice is that this is on the right
> > path to exchange growth.
> >
> > l3 exchange ponints are a labor suck and are fragile.
>
> Maybe. However, l2 is for telco.
>
> l2 exchange ponints are a labor suck and are fragile.
>
> The right path is l1, though, then, there is less reason to have
> exchange points.
>
> It will be more obvious as the peering speed between two ISPs exceeds
> that of a single physical interface.
>
> Masataka Ohta
>
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