Hi Eliot,
> If someone can explain to me how that is possible with APT
Let me take a shot ...
Assume you are allocating some address block /28 for customer from 240
pool. Today you are connected to two ISPs. Mapping entry list two ETRs
for your block either your CE or your ISP PE router. When you need to
switch one ISP with another all you do is to change the ETR address in
the mapping database.
ETR address is a routable address in any of the schemes. Also in any of
the schemes you will get it in some way from an upstream ISP if ETR is
on CE.
Moreover scale*rate equation is happy ... proposed BGP to provide
mapping services while does grow in scale ... goes very well down in
rate. ETR addresses need to fast converge not mapping database.
If customer owns ETRs then transit ISPs may not even participate in the
mapping business as long as they can route to ETRs.
Cheers,
R.
Hi Robert,
It was good seeing you last month.
The big problem with APT as I understood it from the RRG meeting was
that it was an SP-provided solution, when the SPs are not motivated to
actually fix the problem. As I mentioned at the RRG, I believe that we
have different understandings of what provider independence is. To me,
provider independence means that it should be possible to change
providers without permission or even coordination of either the old or
the new. If someone can explain to me how that is possible with APT, it
wasn't clear at the RRG meeting in December. As a bonus, it should be
possible to do all of this without adverse impact on the routing system.
Eliot
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