Mar 9, 2013

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

When BGP tries to install the best path prefix into Routing Information Base (RIB) (for example, the IP Routing table), RIB might reject the BGP route due to any of these reasons:

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

2. Memory failure.

3. 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.
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