[address-policy-wg] IPv6 Policy Clarification - Initial allocation criteria "d)"

Hi,

On Tue, Jun 22, 2004 at 12:23:50PM +0100, Sascha Luck wrote:
> On Tuesday 22 June 2004 07:45, Gert Doering wrote:
> > As of today, "more-specific BGP multihoming" works.  So he *can* set
> > his own routing policy.
> 
> It's certainly a work-around if all else fails. I'm not sure it should be 
> *encouraged* though, since announcing more-specific routes flies in the face 
> of aggregation. 

Having more-specifics for multihomed (and only those!) customers doesn't
mean the rest of the block must be deaggregated.

The impact on the routing table is, at worst, the same as in "you get
your own prefix and announce that world-wide".  At best, the customer
might eventually cease to be multihomed, and the more-specific goes
away.

> Besides don't most people filter on allocation boundaries?

Most people don't filter at all.  Of those that do, some filter on
allocations, and some permit up to /48s.

Which doesn't break anything in that model - the aggregate is there, so
packets travel in the right direction.  "Near to the network in question",
chances are high that more-specifics *are* visible, and thus the packets
can reach their destination.

Nobody can *guarantee* anything anyway.

Gert Doering
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