iBGP Network Command isn't Working

Discussion in 'Cisco' started by teach813, May 19, 2011.

  1. teach813

    teach813

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    For some reason, I am unable to advertise loopback interface 10.17.70.0/24 on R6 to R5 or R9 using BGP and allow those loopback interfaces to be valid, so that they are in the routing table. In short, those loopback interfaces are not listed in the routing table with administrative distance of BGP. Even when there is a static route on R6 destined for null0. And, the loopback interface is advertised using EIGRP in the routing table. No summary is configured on all routers. Very Strange

    [​IMG]

    Below is R6....None of the 10.17.60.0 networks are valid on the other routers
    [​IMG]


    Below is R9...The 10.17.60.0 networks are listed, but they are not valid
    [​IMG]


    Below is R5....The 10.17.60.0 networks are not even listed
    [​IMG]
     
    teach813, May 19, 2011
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  2. teach813

    bitrob2005

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    Your 10.17.70.0/24 on R6 is advertising to its neighbor correct, but what is happen is on R9 you see the rib failures, because that BGP speaker hears a better route to 10.17.70.0/24 from the IGP (EIGRP) ...the admin distance is better or preferred over the IBGP admin "200" distance... so you have to issue the "back door command" under the bgp process.

    Here is a link to explain how to configure it:

    http://www.ccietalk.com/2008/07/23/bgp-backdoor-routes
     
    bitrob2005, Jun 19, 2011
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