From: Toh Soon, Lim (tohsoon28@gmail.com)
Date: Sun Aug 26 2007 - 15:44:49 ART
Hi Alex,
IMHO RIB failure means the router has learned the route via a better AD
source, in your case it's OSPF (AD 110) compared to iBGP (AD 200).
If you configure R1 to advertise the R1-R2 network in BGP, you'll see R2
receives the route in BGP table but its status code is r>.
R2 will still advertise the route in BGP because it's selected as the
best path (the > sign).
HTH. I hope I understood it correctly.
Thank you.
B.Rgds,
Lim TS
On 8/26/07, Alex Steer <alex.steer@eison.co.uk> wrote:
>
> Hello everyone,
>
>
>
> Just got a quick question with regard to BGP RIB failures on internally
> known routes installed into BGP via the network command. I've noticed
> quite a few scenarios where this seems to happen and not sure if I'm
> missing a trick. I was hoping somebody would like to enlighten me
> slightly as to if it causes some sort of problem I'm not noticing.
>
>
>
> Here is the topology/masterpiece of modern art:-
>
>
>
> Network1==R1======R2======R3
>
>
>
> AS numbers
>
>
>
> R1, R2 = 100
>
> R3 = 300
>
>
>
> Network1 is known to R1 and R2 via an IGP (say ospf) and via the network
> command on R1.
>
>
>
> R1s routing table Network1 is known via connected
>
> R2s routing table Network1 is known via ospf
>
> R3s routing table Network1 is known via eBGP (ad20) next hop R2
>
>
>
> Network1 is participating in the OSPF process
>
> Network1 is placed in the BGP table on R1 via "network" command
>
>
>
>
>
> Great so it all works fine. So my question is, why does BGP on R2
> advertise the route to R3 when it doesn't like the route itself? Is
> there a problem that the RIB failure is causing and I'm not seeing? It
> looks to be working fine, is there another purpose to informing me of
> the r?
>
>
>
> R2#show ip bgp
>
> Network Next Hop Metric LocPrf Weight
> Path
>
> r>i Network1/24 Router1 0 100
> 0 i
>
>
>
> R3#show ip bgp
>
> Network Next Hop Metric LocPrf Weight
> Path
>
> *>i Network1/24 Router2 0 100
> 0 100 i
>
>
>
> By the way I made all of the output up as my lab is off so forgive any
> slight mistakes. It's only to aid in posing my question.
>
> Many thanks for any info on this.
>
>
>
> Kind regards
>
>
>
> Alex
>
>
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