so this scenario was a much more scaled down version of the actual topology. Basically I have a "gap" of routers that I don't manage or have access to in between mine running eBGP. We are collecting some metrics and doing monitoring on the AS-PATH of the routes received, among other attributes, for both ends so losing some of this information is a problem. Again, I know the right answer here is to run iBGP across the IGP and I am fighting that fight but it got me looking for alternative solutions and figured I would see if anyone else ever had to come up with a creative solution before. On Thu, Mar 6, 2014 at 4:09 PM, Saku Ytti <saku@ytti.fi> wrote:
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