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BGP attributes through IGP
- Subject: BGP attributes through IGP
- From: saku at ytti.fi (Saku Ytti)
- Date: Thu, 6 Mar 2014 23:09:32 +0200
- In-reply-to: <CAJfNY9sxH9Nr2K-JgmbESQ8T9x5Q+6EYucP=0rx70kLRYYFfvA@mail.gmail.com>
- References: <CAJfNY9sxH9Nr2K-JgmbESQ8T9x5Q+6EYucP=0rx70kLRYYFfvA@mail.gmail.com>
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