[129145] in North American Network Operators' Group
Re: Did your BGP crash today?
daemon@ATHENA.MIT.EDU (Claudio Jeker)
Fri Aug 27 17:44:22 2010
Date: Fri, 27 Aug 2010 23:43:56 +0200
From: Claudio Jeker <cjeker@diehard.n-r-g.com>
To: nanog@nanog.org
In-Reply-To: <6994.1282942637@localhost>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Fri, Aug 27, 2010 at 04:57:17PM -0400, Valdis.Kletnieks@vt.edu wrote:
> On Fri, 27 Aug 2010 13:43:39 PDT, Clay Fiske said:
>
> > If -everyone- dropped the session on a bad attribute, it likely wouldn't
> > make it far enough into the wild to cause these problems in the first
> > place.
>
> That works fine for malformed attributes. It blows chunks for legally formed
> but unknown attributes - how would you ever deploy a new attribute?
>
This is covered by the RFC. Unknown attributes are either dropped or
passed on depending on the attribute flags. The problem as in AS4 was that
there where illegally formed unknown attributes that got passed around and
made RFC compliant routers, which already handled AS4, further down the
chain fail. This problem was addressed in "Error Handling for Optional
Transitive BGP Attributes" but for some reasons people think it is
necessary to make something simple more and more complex so this draft is
still pending.
--
:wq Claudio
