[119614] in North American Network Operators' Group
Re: Who has AS 1712?
daemon@ATHENA.MIT.EDU (Joe Abley)
Tue Nov 24 23:10:30 2009
From: Joe Abley <jabley@hopcount.ca>
In-Reply-To: <m2iqcz8d63.wl%randy@psg.com>
Date: Tue, 24 Nov 2009 20:09:32 -0800
To: Randy Bush <randy@psg.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 2009-11-24, at 20:02, Randy Bush wrote:
>>> Checking "global BGP" only works if the ASN is being announced at =
that instant.
>> How do you announce an ASN?
>=20
> read a basic bgp primer and look at as-path attribute
Right. You can't advertise an ASN; you can only advertise a route and =
include an AS_PATH attribute on it which makes mention of a particular =
AS number.
My point is that in the absence of any mechanism for announcing an ASN, =
a plan to gate assignment of numbers based on an announcement doesn't =
make any sense.
Even in the loose sense of the phrase that you seem to prefer it's =
trivial (and arguably legitimate, although I appreciate that not =
everybody shares my libertarian views on AS_PATH attribute construction) =
for anybody at all to insert an AS number into an AS_PATH, and for the =
route bearing that AS_PATH attribute to propagate globally, whatever =
that means.
So automated checking of "the BGP tables" for "existing announcements of =
an ASN" doesn't seem very helpful.
> frackin' intentionally silly questions
Apologies for expecting anybody to read beyond the first line of my =
reply.
Joe=
