[ipv6-wg] The DFZ and supernetting

Hi,

We have had a fair amount of discussions lately on and off this list about the
explosion of routes in the DFZ as a result of people wanting PI space and the
likes. Others are ofcourse if there is no NAT66 how do you handle multihoming
of a small site - but that is besides the point here.

I have been wondering - since BGP is all about reachability as a goal and not
so much optimal routing/best path/etc. is the easy solution for growth in the
DFZ not overly simple? The way I see it you will end up with three sets of routes
that you will need to carry on your routers:

1) Own customer routes - these can be any prefix length between /48 and /64
2) Other LIRs aggregates in same RIR region - these are /32 and bigger
3) Supernets for other RIR regions - these are /12 or larger

So it seems like the explosion of the DFZ can be managed by supernetting
certain routes. Having come up with this idea my next was - ok what am I
missing here since it seems a simple and easy fix that would work without
breaking much if anything.

Can anyone enlighten me why we should not want to head in this direction?

Met vriendelijke groet,

Jasper Jans
Team Leader Network Operations
Sr. Network Engineer

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