Re: BGP Route Reflector with Synchronization ON

http://www.cisco.com/en/US/tech/tk365/technologies_q_and_a_item09186a00800949e8.shtml#twenty-three
Q. What does r RIB-Failure mean in the *show ip bgp* command output?

R1> *show ip bgp*
BGP table version is 5, local router ID is 200.200.200.1
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> 6.6.6.0/24 10.10.13.3 0 130 0 30 i
*> 7.7.7.0/24 10.10.13.3 0 125 0 30 i

When BGP tries to install the
bestpath<http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094431.shtml>
prefix
into Routing Information Base (RIB) (for example, the IP Routing table), RIB
might reject the BGP route due to any of these reasons:

   -

   Route with better administrative distance already present in IGP. For
   example, if a static route already exists in IP Routing table.
   -

   Memory failure.
   -

   The number of routes in VPN routing/forwarding (VRF) exceeds the
   route-limit configured under the VRF instance.

In such cases, the prefixes that are rejected for these reasons are
identified by r RIB Failure in the *show ip bgp*command output and are not
advertised to the peers. This feature was first made available in Cisco IOS
Software Release 12.2(08.05)T.

On Wed, May 13, 2009 at 8:40 PM, Divin Mathew John <divinjohn_at_gmail.com>wrote:

> I get that.! But.. with Route Reflectors the 5.5.0.0/24, 6.6.0.0/34
> 7.7.0.0/24 are all there in the OSPF Domain too.. Those routes arent
> getting a R.I.B failure.! i need to know why?... When i see the
> roptuing table... OSPF has a route to the Destination but... BGP isnt
> showing it as a RIB failure when SYN is ON.! I switch OFF SYN on R6
> and its BGP table is fine... as expected.! 5.0.0.0/16 6.0.0.0/16
> 7.0.0.0/16 all have RIB Failure due to the OSPF Routes!
> Thanking You
>
> Yours Sincerely
>
> Divin Mathew John
> divinjohn_at_gmail.com
> divin_at_dide3d.com
> http://www.dide3d.com
> +91 9945430983
> +91 9846697191
> +974 5008916
> PGP PUBLIC KEY BLOCK @ http://www.dide3d.com/divin_Public_PGP_key.txt
> Sent from Bangalore, KA, India
>
>
> 2009/5/13 Alex H. Ryu <r.hyunseog_at_ieee.org>:
> > If you have BGP routes not in IGP such as OSPF, you should turn OFF BGP
> > synchronization.
> > For an example, if you peer with EBGP and/or your router is working as
> > transit router from BGP viewpoint, you have to turn off.
> >
> > BGP sync will check IGP routing table, and if it is not in there, BGP
> > will not install those BGP prefix for active entry.
> >
> >
> > Alex
> >
> >
> > Divin Mathew John wrote:
> >> Hey...
> >> i have this scenario where R5-----R6-----R7 and R7 is connected to
> >> R5 for redundancy.! now. I made R5 the Route Reflector. and i have
> >> OSPF running with all the loopbacks advertised in OSPF. Now without
> >> turning ON Synchronization this is the output
> >> R6#sh ip bgp
> >> r>i5.5.0.0/24 5.5.0.5 0 100 0 ?
> >> r>i5.5.1.0/24 5.5.0.5 0 100 0 ?
> >> r>i5.5.2.0/24 5.5.0.5 0 100 0 ?
> >> r>i5.5.3.0/24 5.5.0.5 0 100 0 ?
> >> r>i5.5.4.0/24 5.5.0.5 0 100 0 ?
> >> r>i7.7.0.0/24 7.7.0.7 0 100 0 ?
> >> r>i7.7.1.0/24 7.7.0.7 0 100 0 ?
> >> r>i7.7.2.0/24 7.7.0.7 0 100 0 ?
> >> r>i7.7.3.0/24 7.7.0.7 0 100 0 ?
> >> r>i7.7.4.0/24 7.7.0.7 0 100 0 ?
> >>
> >> where as in Switch ON Synchronization @R6
> >>
> >> r>i5.5.0.0/24 5.5.0.5 0 100 0 ?
> >> r>i5.5.1.0/24 5.5.0.5 0 100 0 ?
> >> r>i5.5.2.0/24 5.5.0.5 0 100 0 ?
> >> r>i5.5.3.0/24 5.5.0.5 0 100 0 ?
> >> r>i5.5.4.0/24 5.5.0.5 0 100 0 ?
> >> *> 6.6.0.0/24 0.0.0.0 0 32768 ?
> >> *> 6.6.1.0/24 0.0.0.0 0 32768 ?
> >> *> 6.6.2.0/24 0.0.0.0 0 32768 ?
> >> *> 6.6.3.0/24 0.0.0.0 0 32768 ?
> >> *> 6.6.4.0/24 0.0.0.0 0 32768 ?
> >> * i7.7.0.0/24 7.7.0.7 0 100 0 ?
> >> * i7.7.1.0/24 7.7.0.7 0 100 0 ?
> >> * i7.7.2.0/24 7.7.0.7 0 100 0 ?
> >> * i7.7.3.0/24 7.7.0.7 0 100 0 ?
> >> * i7.7.4.0/24 7.7.0.7 0 100 0 ?
> >>
> >> @R7 SYN is OFF
> >> r>i5.5.0.0/24 5.5.0.5 0 100 0 ?
> >> r>i5.5.1.0/24 5.5.0.5 0 100 0 ?
> >> r>i5.5.2.0/24 5.5.0.5 0 100 0 ?
> >> r>i5.5.3.0/24 5.5.0.5 0 100 0 ?
> >> r>i5.5.4.0/24 5.5.0.5 0 100 0 ?
> >> r>i6.6.0.0/24 6.6.0.6 0 100 0 ?
> >> r>i6.6.1.0/24 6.6.0.6 0 100 0 ?
> >> r>i6.6.2.0/24 6.6.0.6 0 100 0 ?
> >> r>i6.6.3.0/24 6.6.0.6 0 100 0 ?
> >> r>i6.6.4.0/24 6.6.0.6 0 100 0 ?
> >> *> 7.7.0.0/24 0.0.0.0 0 32768 ?
> >> *> 7.7.1.0/24 0.0.0.0 0 32768 ?
> >> *> 7.7.2.0/24 0.0.0.0 0 32768 ?
> >> *> 7.7.3.0/24 0.0.0.0 0 32768 ?
> >>
> >> I turn OFF SYN at R6 and everything has a RIB failure.. becoz OSPF is
> >> running advertising all the loopbacks.!
> >>
> >> Is there any special thing to be noted while using SYNC with Route
> Reflectors.!
> >>
> >> Generally SYNC is OFF.. Just out of curiosity.!
> >>
> >>
> >> Thanking You
> >>
> >> Yours Sincerely
> >>
> >> Divin Mathew John
> >> divinjohn_at_gmail.com
> >> divin_at_dide3d.com
> >> http://www.dide3d.com
> >> +91 9945430983
> >> +91 9846697191
> >> +974 5008916
> >> PGP PUBLIC KEY BLOCK @ http://www.dide3d.com/divin_Public_PGP_key.txt
> >> Sent from Bangalore, KA, India
> >>
> >>
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Received on Wed May 13 2009 - 21:14:33 ART