[nsp] RIB failure when using backdoor network

[Ilker TEMIR]

RIB-failure is something new and it came with

CSCdp12004: BGP: Should not advertise if IP rejects BGP route unless nhop
match

Basically if you have a bgp entry and the same entry learned via IGP, they
have to be pointing to the same next-hop. Otherwise advertising BGP prefix
may cause loops.

Ilker

----- Original Message -----
From: <Scott.Keoseyan@BroadWing.com>
To: <cisco-nsp@puck.nether.net>
Sent: Wednesday, November 13, 2002 2:32 PM
Subject: [nsp] RIB failure when using backdoor network


> I ran into a weird situation and I am hoping someone can shed some light
> here...
>
> I am receiving a default route via eBGP (don't ask).  I also have
generated
> a default-route from another router via my IGP, which I prefer.
>
> I used the
>
> "network 0.0.0.0 mask 0.0.0.0 backdoor"
>
> command, to ensure I used the default I prefer.
>
> When I did this, I ended up with a RIB Failure in the BGP table.  Is this
> normal?
>
> router2#sh ip bgp
> BGP table version is 19286, local router ID is 172.16.0.1
> Status codes: s suppressed, d damped, h history, * valid, > best, i -
> internal,
>               r RIB-failure
> Origin codes: i - IGP, e - EGP, ? - incomplete
>
>    Network          Next Hop            Metric LocPrf Weight Path
> r> 0.0.0.0          192.168.100.1                  119      0 100 200 i
>
> when I remove the command, the route simply drops back to "valid" state,
> which is what I would expect, but I did not expect to see RIB-Failure when
I
> used the backdoor command since it doesn't appear to be noted anywhere in
> the documentation (RIB-Failure as a Status code does not appear to be
> documented yet in any of the docs I could find... a search on
"RIB-Failure"
> produced no meaningful results).
>
> I did find a bug (CSCdw84776) that describes a condition when operating as
a
> PE that could cause a RIB failure, but that has little to do with my
> config...
>
> This is a 3660 running 12.2(11)T... and I know... it shouldn't be... :-/
>
> thanks,
>
> Scott
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