2 routers and 4 peers route export selection

[Ondrej Zajicek]

On Fri, Apr 20, 2012 at 02:32:57PM +0200, Laurent GUERBY wrote:
> Hi,
> 
> I have two debian BIRD routers R1 and R2 connected by an iBGP session,
> both R1 and R2 are connected to two eBGP peers each:
> 
> P1 <==> R1 <===> R2 <===> P3
> P2 <==> |        |  <===> P4
> 
> Some routes are imported by R1 from both P1 and P2 and I want to
> continue to export to P3 a mix of routes from P1 and P2 (which is what
> is done by the iBGP session and preferences) but now I want to export to
> P4 only the routes imported from P2 and no route imported from P1.

You could filter out routes from P1 by something like 'export where
bgp_next_hop = 1.2.3.4', but less preferred routes from P2 are not even
propagated to R2 by R1, the simple solution would be to use independent
BIRD instance for session to P2 (and iBGP to R1 and R2).

-- 
Elen sila lumenn' omentielvo

Ondrej 'SanTiago' Zajicek (email: santiago at crfreenet.org)
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."
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