[85143] in North American Network Operators' Group
Re: Cogent/Level 3 depeering
daemon@ATHENA.MIT.EDU (Joe Abley)
Wed Oct 5 16:20:30 2005
In-Reply-To: <434427F1.5080103@wvi.com>
Cc: John Payne <john@sackheads.org>, NANOG list <nanog@nanog.org>
From: Joe Abley <jabley@isc.org>
Date: Wed, 5 Oct 2005 15:51:57 -0400
To: Jeff Shultz <jeffshultz@wvi.com>
Errors-To: owner-nanog@merit.edu
On 5-Oct-2005, at 15:22, Jeff Shultz wrote:
> Interesting. Balkanization of the Internet anyone? As one other
> commenter hinted at, it does sound like a recipe for encouraging
> multi-homing, even at the lowest levels. How many ASN's can the
> system handle currently?
It's a 16-bit number; 0 isn't used, and the IANA (per RFC 1930)
reserves 64512 through 65535 for private use. So from a resource
allocation perspective, the answer is 64511.
There is a proposal to introduce 32-bit AS numbers. See, for example:
http://www.ietf.org/internet-drafts/draft-ietf-idr-as4bytes-11.txt
http://www.ietf.org/internet-drafts/draft-huston-idr-as4bytes-
survey-00.txt
We have talks scheduled for Los Angeles about AS number exhaustion.
Joe
