BGP RIB-failure

See network ... what exactly is implied by r RIB failure?  Just curious.

Rack1R4#show ip bgp
BGP table version is 26, local router ID is
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
*>i28.119.16.0/24               0    100      0 100 54 i
*>i28.119.17.0/24               0    100      0 100 54 i
*>i112.0.0.0               0    100      0 100 54 50 60 i
*>i113.0.0.0               0    100      0 100 54 50 60 i
*>i114.0.0.0               0    100      0 100 54 i
*>i115.0.0.0               0    100      0 100 54 i
*>i116.0.0.0               0    100      0 100 54 i
*>i117.0.0.0               0    100      0 100 54 i
*>i118.0.0.0               0    100      0 100 54 i
*>i119.0.0.0               0    100      0 100 54 i
r>i204.12.1.0               0    100      0 400 i
*>i205.90.31.0               0    100      0 200 254 ?
*>i220.20.3.0               0    100      0 200 254 ?
*>i222.22.2.0               0    100      0 200 254 ?
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Don JohnstonInstructorCommented:

What does r RIB-Failure mean in the show ip bgp command output below?

When BGP tries to install bestpath prefix into Routing Information Base (RIB), i.e., the IP Routing table, RIB might reject the BGP route due to any of the following 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 the above 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.


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Don's got the right generic info... if you're looking for the specifics on that particular route failure just issue a:
show ip bgp rib-failure

and that will tell you why that route didn't get installed in the RIB.

neowolf219Author Commented:
excellent work guys, that's dead on.  
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