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Forum Replies

  1. Amit,
    Only on the router where the summarization is configured does the Query process stop–not on the router that originates the Query. So for example, if you have three routers A, B, and C with a topology of A—B---C. B has created a summary, say 10.10.0.0/16. Suppose Router A has a route 10.10.10.0/24 that goes active. Router A will still send the Query message to B, but B will see that 10.10.10.0/24 is contained within its own configured summary of 10.10.0.0/16. This will cause Router B to stop propagation of the Query to router C. Additionally, Router

    ... Continue reading in our forum

  2. We have these two networks:

    R2#show ip route eigrp 
         172.16.0.0/24 is subnetted, 2 subnets
    D       172.16.0.0 [90/30720] via 192.168.12.1, 00:02:28, FastEthernet0/0
    D       172.16.1.0 [90/30720] via 192.168.12.1, 00:02:28, FastEthernet0/0
    

    The most optimal summary rounte for 172.16.0.0/24 and 172.16.1.0/24 is 172.16.0.0/23.

    In binary, these two look like this:

    * 10101100 00010000 00000000 00000000
    * 10101100 00010000 00000001 00000000

    Above you can see that the first 23 bits are the same, that’s why we use the /23 summary.

    Rene

  3. Yes, thank you very much!

  4. Thanks Lazaros,
    Now it is clear for me very nice explanation.

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