Refer to the exhibit

Which three statements describe r RIB-Failure in the show ip bgp command output?
(Choose three)

A.
It is a redundancy route.

B.
It is a route with a better administrative distance already present in IGP.

C.
The number of routes in VRF exceeds the route limit that is configured under the VRF instance.

D.
It is a rerouting entry

E.
It indicates memory failure

Explanation:

http://www.cisco.com/en/US/tech/tk365/technologies_q_and_a_item09186a00800949e8.shtml#tw
enty-three
When BGP tries to install the bestpath 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.