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Forum Replies

  1. Dear Ahammad,

    You have to configure this on all routers within the sub-AS otherwise they won’t consider themselves part of the confederation. They will be able to establish BGP peerings but they’ll consider other routers in the confederation as regular “external” or “internal” neighbors. They will also drop routes when they see a confederation path in it.

    I tested this, here is the output of some show commands when I removed “bgp confederation identifier 2” on R3, R4 and R5:

    R3#show ip bgp
    BGP routing table entry for, version 19
    ... Continue reading in our forum

  2. Hi Rene

    Thank you for this article.

    I had a question though

    When R1 advertises route to R2 that’s external and learned via ebgp. For ibgp protocol states that next hop advertised by ebgp should be carried into ibgp. So when R1 advertises to R2 it uses next hop address as So when R2 advertises this route to its ibgp peers it should have next hop as and not as .
    Is this case we can also use next-hop-self command ? or using igp like ospf is the only option?

    thank you

  3. Hi Kandhla,
    Yes, you can absolutely use the next-help-self option with iBGP. In fact, in some circumstances you might HAVE to. For example, let’s say you have a router (R1) with an external BGP relationship with an ISP, and your highly available site has been given two separate circuits from that ISP. To ensure that R1’s BGP neighborship with the ISP is also highly available, you have configured R1 to use the ISP’s router’s loopback address (you would also have to use the ebgp-multihop option for this). To do this you would create static routes on R1 to get

    ... Continue reading in our forum

  4. Both are working on the same manner in order to overcome the drawback of IBGP full mesh…what is the difference between route reflector and bgp confederation??..

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