[169631] in North American Network Operators' Group
Re: BGP attributes through IGP
daemon@ATHENA.MIT.EDU (Saku Ytti)
Thu Mar 6 16:10:00 2014
Date: Thu, 6 Mar 2014 23:09:32 +0200
From: Saku Ytti <saku@ytti.fi>
To: nanog@nanog.org
In-Reply-To: <CAJfNY9sxH9Nr2K-JgmbESQ8T9x5Q+6EYucP=0rx70kLRYYFfvA@mail.gmail.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On (2014-03-06 10:37 -0500), Bryan Ashley wrote:
> My searches have come up a little short however I found a couple references
> to using automatic-tag and as-path tag to carry this through. I cant seem
> to find any Junos reference information on this so wanted to reach out to
> the ether and see if others have faced this situation before or have any
> other recommendations on solutions.
I don't think JunOS supports this.
It's bit of hack at any rate. It's not transporting AS_PATH, it's transporting
single 16b ASN.
It's essentially abusing (some what well-defined and interoperable abuse) 32b
tag field for this purpose.
Maybe you could try to do some of this manually, set some tags, which trigger
'set then origin x', as-path-expand/prepend might be more challenging.
Recommendation for solution might be easier with rationale why you need to
transport origin+aspath over IGP.
--
++ytti
