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 150.1.2.0/24 is experiencing a RIB-failure:

R1> sh ip bgp
BGP table version is 5, local router ID is 200.200.200.1
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> 150.1.2.0/24       10.1.1.2                   0    110      0 300 i
*> 155.1.123.0/24   10.1.1.2                   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 🙂 )

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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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