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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.

    Rene

  4. Mahmoud,
    You are exactly right! This is the output of R2 with respect to the BGP advertised route of 1.1.1.1

     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 1.1.1.1
    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 1.1.1.1/32

  5. Hi Rene,

    In BGP community no export example.You said that it prevent route from being advertise to the ebgp peer and only advertise to IBGP neighbors. so why it is advertising to AS24 as it is also an ebgp peer for AS1. Router is in AS 1 and R2 ,R4 is in AS 24.Kindly explain.

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