[j-nsp] JUNOS resolves indirect next-hops using other BGP routes

[david.roy at orange-ftgroup.com]

Yes I understand, you want is to disable recursive lookup, but I believe that you can't do that.
Just for information could you give me the output of the command :

show route resolution 195.18.241.97 extensive

Thanks
Regards
David

 

-----Message d'origine-----
De : Tore Anderson [mailto:tore at linpro.no] 
Envoyé : mercredi 4 février 2009 14:53
À : ROY David DTF/DERX
Cc : juniper-nsp at puck.nether.net
Objet : Re: [j-nsp] JUNOS resolves indirect next-hops using other BGP routes

* david.roy at orange-ftgroup.com

> The protocol next-hop seems to be resolvable : but it is not directly 
> known in our IGP. So you have a recursive lookup til you find a 
> forwarding next-hop.

Yes, exactly.  What surprises me, however, is that EGP routes is considered at all when resolving indirect next-hops of iBGP routes.  I have problems coming up with a scenario where that behaviour would be desireable, and the JUNOS documentation I quoted is also quite clear on the fact that it is intra-AS OSPF, IS-IS, RIP, or static routes that are supposed be used for next-hop resolving.

The behaviour I expect (and want) is for routes that come with a next-hop that is not resolvable through my IGP should be ignored outright and _not_ be placed in the PFE, even though the next-hop is resolvable using a BGP route.

Regards,
--
Tore Anderson
Redpill Linpro AS - http://www.redpill-linpro.com/


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