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Forum Replies

  1. Hello,

    thank you for this lesson, and It very helpfull.
    on the start of config on router 1, I think there is one mistake.

    R1(config)#router eigrp 123 (router ei 12).

  2. Hi Rob,

    There's a big difference between the two. An EIGRP router that is configured as a stub does not receive queries when one of its neighbors loses a network.

    Passive-interface is about sending hello packets on an interface. Normally when you use the network command to advertise something then it does two things:

    1) It advertises all networks that fall within the range of your network commmand on all active interfaces.
    2) It sends hello packets on all active interfaces that have networks that fall within the range of your network command.

    When you enable passive-interface, it will stop sending the hello packets. This is useful on interfaces that connect to end-devices like phones, workstations, servers, etc. You probably don't want to send EIGRP hello's in their direction...there are no EIGRP routers there.

    Hope this helps!


  3. Rene, i just labbed this one, i configure eigrp stub redistributed on the R2 and the ip summary-address. R3 didn't learn the network.

    also i have another question, you said when i configure eigrp stub redistributed, it will also enable "Connected and Summary" right? so in short, Redistributed, Connected and Summary routes will be advertised.

    Since you created a Loopback interface on R2, it is now directly connected on your R2, so even if you dont configure "redistribute connected" it will advertise the Loopback since it is directly connected and under stub redistributed, Connected and Summary is also enable on this one.

    Thank you.

  4. Hi John,

    That's interesting, I just tried it on a 1841 with IOS 15 and it does the same thing. When I configure EIGRP redistributed then that's the only thing that shows up in the config. On a 3725 running 12.4T it does add connected and summary automatically as well.


  5. Hello Rene,
    I have got some confusion here. I am going to use the below topology to ask my questions.

    1) In this topology, let's say Stub is not configured. If I shutdown the loopback 0 on R2, who would send out Query? Is it only R1 or only R2 or both routers?

    2) Here If R1 is configured as Stub and Loopback 0 gets shutdown on R2, R2 will not send any Query to R1. However, R1 will send Query to R2. Is it correct?

    Thanks a lot.


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