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Forum Replies

  1. Hi Saw,

    Let’s imagine we have two routers, R1 and R2. R1 has 8 interfaces. We advertise 8 subnets from R1 to R2. In this case, R2 will have 8 entries in its routing table. When one of the interfaces on R1 goes down, R2 will lose the subnet in its routing table. Depending on the routing protocol, it will act upon this, trying to find another path.

    If we would advertise a summary route that matches all 8 subnets on R1 instead, then R2 would only have 1 entry in its routing table. This will save some memory. The second advantage is that when one of the interfaces

    ... Continue reading in our forum

  2. Hi guys,

    one question regarding the network command.
    Rene writes: " I also could have used just one network command:

    R2(config-router)#network 192.168.0.0"

    How can the network command be understood? Is it classful?
    If so, why does 192.168.12.0 and 192.168.23.0 fall in the 192.168.0.0 network? As this network would only consist of 192.168.0.0 - 192.168.0.255!?

    If not, wouldn’t 192.168.23.0 fall also in 192.168.12.0 network? 192.168.12.0 - 192.168.255.255!? And we could also have used 192.168.12.0 instead?
    What do I miss here?

    Thanks for your help!
    Flo

  3. Hello Florian

    Yes you are correct that if the command network 192.168.0.0 was configured, it would only advertise the 192.168.0.0/24 subnet and not all the 192.168.0.0/16 subnet. Although RIP v2 is classless, the configuration commands are classfull. Now if the above were network 172.16.0.0 subnet, then the command would indeed work just like Rene has described, because the command would refer to a class B or /16 subnet which would include any interfaces with addresses between 172.16.0.0 and 172.16.255.255. However, RIPv2 would advertise the networks using t

    ... Continue reading in our forum

  4. Hello Ghaith

    As for the auto-summary feature of EIGRP, it works a little bit differently. EIGRP supports CIDR and variable length subnet masking but routes are not summarized at the classful network boundary unless auto summary is enabled.

    I hope this has been helpful.

    Laz

  5. Hello Ghaith

    The purpose of this forum is to be a place of constructive discussions where we can all help each other in our quest to become better networking professionals. There is no need to be adversarial. If I came across as adversarial, or if I upset you in any way I apologize.

    You didn’t. It was just a part of my explanation.

    ... Continue reading in our forum

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