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Forum Replies

  1. Thank you Rene for making it easy to learn this kind of stuff :slight_smile:

  2. thanks your rene, you d best !

    quick check : why you gave next-hope-self on 4. without that also I get the same result.

  3. Hi Abhishek,

    Without next-hop-self, R4 would learn the IP address of R1 as the next hop address. As long as you advertise the network in between R1/R2 into BGP, you will be fine. If you don’t, you have to use next hop self.


  4. R2 do not send-community to R4, in this case what happens if R4 is connected to another AS ?
    i think R4 will advertise the prefix because it does not any thing about the community, please correct me if wrong

  5. Mahmoud,
    You are exactly right! This is the output of R2 with respect to the BGP advertised route of

     Origin IGP, metric 0, localpref 100, valid, external, best
          Community: no-export

    If R2 isn’t configured to send communities to R4, this would be R4’s output of
    Origin IGP, metric 0, localpref 100, valid, internal, best

    Notice the community is missing. Because of this, R4 doesn’t know that it isn’t supposed to advertise this to another AS, so any other AS connected via R4 would also learn of

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