Re: FW: more specific routes in today reality

[Gert Doering <]

Hi,

On Wed, Nov 07, 2001 at 05:55:44PM +0100, Koepp, Karsten wrote:
[..]
> >  - if the customer goes away, the network can be given back and the
> >    route will disappear -> good for conservation *and* aggregation.
> I don't follow that this will decrease routes.

The assumption is that if the customer goes to a different ISP and 
is then only single-homed, his (new) network will then not have to be
visible world-wide, and his "old" space can be returned to the old ISP.

With PI, the space is "claimed forever" and will have to be visible 
forever, even if the customer is not multihomed any more.

[..]
> Gert, after all you are convincing. 
> This means in turn, it would be conform to the rules to multi-home PA
> addresses and it just depends on the service providers co-operating 
> to create the route objects.

This is how I understand "current rules" of consent.

> Is this really current practice? 

People are doing it (we have been doing it in the past, and the fact
that we're not doing it right now just means "we have no customers that
match that particular solution").

People do much worse things (to rant for a while), like "announcing
a /19 in individual /24's with different prepends/MEDs to get load-
balancing" - look at what AS 1913 announces to see something really 
scary... :-(

> Where or when is this gonna be reflected in RIPE docs?

As Sabrina answered today, this is a conflict that has been there
forever, in a way.  RIPE can't tell people what's "legal" concerning
BGP announcement and routing/filtering, so they don't.  Even if it might
be helpful to have a clear statement on what should be announced and 
what not ("RIPE are the network gods, they know/*make* the rules!"), 
the people that don't care today won't care then...

> Total number of questions concerning RIPE policies:     73128

Oh, it's not *that* difficult :-)

Basically "doing the reasonable thing with enough common sense" will 
usually not be too different from what's "legal according to policies".

Gert Doering
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