Re: /24s run amuck

[Steve Francis <steve () expertcity com>]

Patrick W.Gilmore wrote:

> On Jan 13, 2004, at 2:19 PM, Steve Francis wrote:
>
> > I'll take some education - given two POP's, different upstream ISPs 
> > at each POP, and a desire to have traffic for specific networks (/24) 
> > enter a specific POP, can that be done without de-aggregation?
> > We are not doing this ourselves - we're not yet big enough to have 
> > our own aggregate blocks, but if we did, we could not just announce a 
> > /20 at each POP, and transit the traffic back to the appropriate 
> > datacenter ourselves. We're an ASP, and do not have real links 
> > between POP's, only VPN's.
> >
> > If we used consistent upstreams at each POP, we could do it by 
> > announcing specific /24's with no-export communities, but a 
> > consistent set of ISPs are not available at each of the colo's we are 
> > in.
> >
> > Is there some other trick I'm missing?
>
>
> If you can't take the traffic from Site A to Site B, why are you 
> announcing the /24s to the world?  Why not just use a /24 from the 
> upstream in each location and not force everyone else on the Internet 
> to see your /24 which only has one path?

It doesn't have just one path. Multiple (different) ISPs at each location.