[nsp] RIB failure when using backdoor network

[Ilker TEMIR]

You might want to see CSCdx26714 & CSCdy39249

Ilker

----- Original Message -----
From: "Tim Devries" <zsolutions@cogeco.ca>
To: "Ilker TEMIR" <itemir@cisco.com>; <Scott.Keoseyan@BroadWing.com>;
<cisco-nsp@puck.nether.net>
Sent: Thursday, November 14, 2002 10:43 PM
Subject: Re: [nsp] RIB failure when using backdoor network


>
>
> I have the same issue, except I am not using an interior routing protocol,
> and get RIB failures for a ton of external routes.  I'm only
redistributing
> a few statics, one to null and the other points to my firewall where the
IP
> address space resides behind.
>
> So in this case, I don't understand why the failure occures, but it looks
> like an IOS upgrade issue with the T train.
>
>
> > 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
> > >  +++The information transmitted is intended only for the person or
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> > received
> > > this in error, please contact the sender and destroy any copies of
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