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Forum Replies

  1. Let me give an example to avoid confusion. To keep it simple and fast, I’ll use EIGRP and a distribute-list. Here’s R1:

    R1#show run | begin router eigrp
    router eigrp 1
     network 0.0.0.0
    

    and R2:

    R2#show run | begin router eigrp
    router eigrp 1
     network 0.0.0.0
    

    R1 has two loopback interfaces that are advertised to R2:

    R2#show ip route eigrp 
    
          1.0.0.0/24 is subnetted, 1 subnets
    D        1.1.1.0 [90/130816] via 192.168.12.1, 00:02:32, GigabitEthernet0/1
          11.0.0.0/24 is subnetted, 1 subnets
    D        11.11.11.0 [90/130816] via 192.168.12.1, 00:02:32, Gigab
    ... Continue reading in our forum

  2. I think this should be the other way around:

    “As a result, R2 will not advertise it to R3 (iBGP) or R4 (eBGP).”

    Since R4 is in the same AS as R2, they would use iBGP and since R3 is in another AS it would use eBGP.

  3. Hello Elias

    Yes you are correct. It should read:

    “As a result, R2 will not advertise it to R3 (eBGP) or R4 (iBGP).”

    Thanks, I’ll let @ReneMolenaar know.

    Laz

  4. Hello Card

    The point of the No Advertise community is that you can advertise a prefix to you iBGP neighbor, but you can instruct that neighbor not to advertise it to any other neighbors downstream. The result is that R1’s neighbor (R2) learns of the prefix but R3 and R4 don’t.

    If the prefix was not advertised in the first place, R2 would not know the prefix either. This is a different result than when the No Advertis

    ... Continue reading in our forum

  5. Thanks

    This website is REALLY REALLY good to understand basic to advance level!

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