[ipv6-wg] The DFZ and supernetting

> It sounds suspiciously like ITU for me (ie, bad).  It imposes previously
> non-existent architectural limits and constraints on Internet routing
> (given there is some form of routing police, of course :-)):  How would
> you multi-home across region boundaries?

Good point. Only way is ending up with a kludge I guess where for those parties
that connect over multiple summarization boundries you do not only carry a
summary but also the more specific. Hence you loose effect towards less routes
in the table for these parties.

> What will happen with other inter-region connectivity? All AS:es who
> peer over a region-boundary, they will have to stop? (Who can enforce
> that?)
> Or will they have to get space from each regions RIR and do prefix
> translation in their routers? (This will amplify space usage by number
> of regions, roughly, for operators with presence in more than one
> region.)

That can hardly be a correct way to go down. Sounds like this is for sure one
of those items coming in the way of simple aggregation.

> Jasper, how did you conclude that RIR region boundaries is a good place
> to draw the line in the sand by the way?
>  Why, for example, didn't you suggest nation state borders?  (Ie,
> Denmark could have 0045::, Sweden 0046:: and so on)

Just picked a boundry - I guess there are multiple boundries where aggregation
can take place. For the moment I kinda stuck by the delegations known to me
already (RIR/LIR/etc). Depending on how RIRs assign prefixes today you could
implement summaries in between the RIR and LIR level. But in light of your
point made above - it does seem to me that the more summaries are made on a
smaller scale the more exceptions are required. In a way I also felt that it
aligns well with what we for instance do - we do IP transit and peering. All
peerings are mainly with parties inside Europe. Transit carries all the other
traffic which is mainly US/Asia/etc.

Jasper


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