CCIE Pursuit Blog

April 27, 2009

Core Knowledge Question of the Day: 27 April 2009

Give at least two possible reasons as to why the prefix is experiencing a RIB-failure:

R1> sh ip bgp
BGP table version is 5, local router ID is
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>                   0    110      0 300 i
*>                   0    160      0 300 i

Highlight for answer: Generally this is due to the existence of a route with a lower AD in the IP routing table.  This can also be due to a memory error or the number of routes in VRF exceeding the route-limit configured under the VRF instance (outside of the scope of the Routing and Switching lab…for now 🙂 )


1 Comment »

  1. the prefix is also learned via IGP and is preferred over iBGP

    Comment by ccie — May 12, 2009 @ 12:58 pm | Reply

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