[153161] in North American Network Operators' Group
Re: HE.net BGP origin attribute rewriting
daemon@ATHENA.MIT.EDU (Saku Ytti)
Thu May 31 13:08:19 2012
Date: Thu, 31 May 2012 20:06:46 +0300
From: Saku Ytti <saku@ytti.fi>
To: nanog@nanog.org
In-Reply-To: <1338479206.77423.YahooMailNeo@web31803.mail.mud.yahoo.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On (2012-05-31 08:46 -0700), David Barak wrote:
> On what precisely do you base the idea that a mandatory transitive attribute of a BGP prefix is a "purely advisory flag which has no real meaning"? I encourage you to reconsider that opinion - it's actually a useful attribute, much the way that MED is a useful attribute. Many providers re-write MED, and apparently some re-write ORIGIN. Neither of those is "network abuse" - it's more accurately described as "network routing policy." As has been stated here before: your network, your rules.
When provider rewrites MED, they do it, because they don't want peer to
cause them to cold-potato, to which they may have compelling reason.
Then some clever people realise they forgot to rewrite origin, working
around the implicit agreement you had with them.
--
++ytti
