RIB failure, occurs when the route is learned from both the IGP as well as the EGP and the route learnt from IGP has better administrative distance, or if a static route (same as the route learnt from the EGP) is in the routing table. or if there is a memory failure (Check if your system RAM is working fine or whether you have optimum memory).Another reason for the RIB failure is when the Number of routes in the VRF exceeds the route-limit that may have been configures for that instance - Check if there is a route-limit for the customer VRF.
The reason why this occurs is well explained in the below
Each protocol depends on CEF to continue forwarding packets during switchover while the routing protocols rebuild the Routing Information Base (RIB) tables. Once the routing protocols have converged, CEF updates the FIB table and removes stale route entries. CEF then updates the line cards with the new FIB information
Check out the information in the article for cisco caveats under heading
Thanks for the infomation given.I really appreciated.I have double check with the routes.So far no duplicate routes.However, you did mension about cisco IOS caveats, just replace and upgrade version and there is no more RIB failure.
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