Thanks for the input. Given our network topology, I am trying to avoid
running a full IBGP mesh.
Also forgot to mention, OSPF Area 5 is a NSSA so that I will have control
over what is being advertised.
----- Original Message -----
From: "Jonathan Lassoff" <[email protected]>
To: "Cyn D." <[email protected]>
Cc: <[email protected]>
Sent: Tuesday, May 22, 2012 4:34 PM
Subject: Re: [j-nsp] Route redistribution
On Tue, May 22, 2012 at 12:24 PM, Cyn D. <[email protected]> wrote:
Network connections:
We have router A(M120, 10.4), B(MX240, 11.4) and C(M7i, 10.4) connected as
a triangle. Router A and B are in OSPF area 0 and also run IBGP between
them. Router C is connected to A and B via OSPF area 5.
Problem:
Router A has a lot of EBGP learned routes. These routes are redistributed
to router B using IBGP and OSPF. My intension is to redistribute these
routes to Router C with OSPF from BOTH A and B. Therefore if A-C link
fail, Router C will learn all routes from B. The problem is now Router C
only learned these routes from A but can not learn from router B. Did I
miss anything or is it Router B not working properly?
Assuming that B and C are both in the same AS and speaking iBGP, B
wont re-announce the NLRIs back into itself without being set as a
route reflector.
However, I'd recommend making a full-mesh of BGP sessions over
OSPF-learned loopback addresses. Whether that's hauled over MPLS or
some other L2 transport mechanism, or using routing and multi-hop BGP
is up to you.
That way, C will still learn the routes coming into A, even if the
path is via B to get to the next-hops.
Cheers,
jof
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