From: Darek Kuzma (darekk@xxxxxxxxxxxxx)
Date: Fri Apr 27 2001 - 13:07:16 GMT-3
Murphy,
I work for AT&T and our and all major ISPs policy is to exchange /24 and
shorter prefixes (/24, /23, /22 ...).
All longer prefixes are either not advertised or are not accepted by ISPs so to
accomplish multihoming customer needs to advertise at least class "C".
Thanks,
Darek
"Murphy, Brennan" wrote:
> What is the smallest subnet that major carriers will exchange with one
> another? /24..../26.../27?? I know that the real issue is the size of
> the route table.
>
> I'm just wondering about the reallity of scenarios that Habali describes
> where an institution advertises an aggregate with specific subnets.
>
> I know that when you're multi-homed to a carrier, that carrier will
> sometimes
> take your /26 and /27 nets to help route inbound traffic but that carrier
> will not advertise those nets to its neighbors.....at least thats what I've
> heard.
>
> Anyone have any real world experience with this? Or is there a URL
> I could read up on?
>
> Thanks,
>
> BM
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