[21635] in North American Network Operators' Group
Re: Strange BGP announcement
daemon@ATHENA.MIT.EDU (I Am Not An Isp)
Tue Nov 17 15:37:21 1998
Date: Tue, 17 Nov 1998 12:04:16 -0800
To: Andrew Bangs <andrewb@demon.net>
From: I Am Not An Isp <patrick@ianai.net>
Cc: nanog@merit.edu
In-Reply-To: <911332072.0029732.0@office.demon.net>
At 07:47 PM 11/17/98 +0000, Andrew Bangs wrote:
>patrick@ianai.net wrote:
>I don't recall saying that, or anything about route selection.
>I don't want all backbone routers (or any of them, for that matter)
>ignoring Update messages (or worse, propagating the announcements) with
>malformed AS_PATH attributes when they should be returning a NOTIFY and
>closing the BGP session.
You said you wanted routers that followed the RFC. The RFC does not
mention list AS_PATH length as a route selection criteria. I have been
told that the draft for the next rev specifically prohibits using AS_PATH
length as a route selection criteria.
I kinda like using AS_PATH length. It's not perfect - and I'm definitely
open to suggestions - but for now it's working. And changing that in
today's environment would be ... monumental to say the least.
OTOH, I completely agree that the routers should have *not* passed on
malformed announcements, and behaving improperly to certain errors.
>Andrew Bangs, Network Engineering Manager, Demon Internet Ltd
TTFN,
patrick
I Am Not An Isp
www.ianai.net
"Think of it as evolution in action." - Niven & Pournelle
