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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. Dear Rene,

    Thanks for the information. Yes that is correct.

    However, I simulated a similar lab like yours but I have not connected R4 and R5 that you have done, only to see if those router can communicate with R1. And i found out that if i don’t connect R4 and R5 to each other as redundant link then those two router do not need the “bgp confederation peer” and “bgp confederation identifier” commands. Also I found out that those two commands are mandatory for R2 and R3. Since, R2 is connecting External AS router R1 and Internal “sub-as” router R3 and R3 is con

    ... Continue reading in our forum

  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. Hello Rene,

    Can you tell me if in GNS we have any kind of incompatibility with Confederations.

    I did a lab on the GNS3 Cisco Router 7200, when I set up EBGP between R1 x R2 look at the messages.





    AS error:




    ... Continue reading in our forum

  5. Hi Rene,

    I was making my own topology for BGP Confederation, I had divided one AS 2 into two sub AS, 100 and 200 and in each sub AS I had configured route -reflector, the router which is connected to the EBGP on both the Sub As is having an error for

     RIB-failure   RIB-NH Matches            Higher admin distance 

    This is for both the Sub AS, can you please tell how I can fix it?


    router ospf 2
     network area 0
     network area 0
    router bgp 200
     no synchronization
     bgp log-
    ... Continue reading in our forum

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