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Forum Replies

  1. tkalis says:

    Rene,
    Hi. Great explanations as always. One quick clarification - in the offset list example towards the end of the network lesson you show applying the offset list to the F0/1 interface. of R2. I assume that you must also apply it to the F0/0 as well (like you did in the example following using distribute-lists)?

    Many thanks,
    Thomas

  2. Hi Thomas,

    Glad to hear you like it! In my example, R4 was advertising the route with the lower better but it could also been R3 (depends on which router converges first) so yes, you should also apply the offset-list to the interface facing R2.

    R3 and R4 can never advertise anything useful about network 1.1.1.0 /24 to R2 so we should ignore anything they send.

    Rene

  3. Dear Rene,

    Referring to your “R2 has learned about network 1.1.1.0 /24 from R1 with a hop count of 6. I used an offset-list on R1 to increase the hop count for this topology, I’ll show you why in a bit.,”

    Can you please help showing how to set hop count up to 6?

    I have tried the following:

    R2(config)#router rip

    R2(config-router)#offset-list LOOPBACK_R1 in 6 fa0/0

    but the hop count is still one from R2 result.

     

    Thanks.

    Makara NGY

  4. Hi Rene, there is actually something even deeper to this that you may not have realised. Let’s say the network is stuck in the loop currently, and R2’s best path is via R4 to reach 1.1.1.0/24. Okay? So since R4 told R2 this is the best path via RIP, this ALSO means that since RIP is distance vector, it means split-horizon would then suppress advertisements of 1.1.1.0/24 from R2 towards R4. So EVEN IF you change the AD on R4, once the loop is active, lowering the AD of RIP or increasing the AD of OSPF external routes should not affect anything. Since R4’s RIP database won’t even have a route to 1.1.1.0/24 inside of it, the only path to 1.1.1.0/24 is via R3. So how would you handle this in the lab exam, if you are stuck in this scenario & can’t make the AD adjustments actually work? Just ran into this a moment ago in a lab :slight_smile: And I even turned split-horizon off to try make it work, but it actually didn’t work lol.

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