Re: Fwd: The IESG Approved the Expansion of the AS Number Registry

[Geoff Huston <gih at apnic.net>]

> But, with the expanded space, there is an issue of how to transition
> to the larger numbers. This is a software problem as much as
> anything. Until all software understands the bigger numbers, people
> will want to continue using the 16-bit ones.


I had a shot at documenting this in the form of a presentation slide 
pack. Even if you continue to use a 16 bit ASN indefinitely things 
may need to change:

http://www.potaroo.net/presentations/2006-10-11-asns.pdf




> Meanwhile, to encourage the migration to 4-byte ASNs, the RIRs have
> been developing a globally-coordinated policy for how to transition to
> 4-byte ASNs (hi Geoff!). The first step of that process, effective
> January 1, 2007, is to allow requestors to obtain 4-byte ASNs (if they
> specifically request them). But, in order for the RIRs to be able to
> offer them, IANA has to give them some. Hence, the IESG action
> mentioned in the note.
>
> See http://www.arin.net/policy/proposals/2005_9.html for more details.


and http://www.potaroo.net/ispcol/2005-08/as.html for a (much longer) 
look at the role of ASNs and the way in which expanded AS numbers are 
to be transitioned in from a technical perspective

regards,

   Geoff




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