From: Ronnie Angello (ronnie.angello@gmail.com)
Date: Thu May 24 2007 - 09:28:34 ART
Your 2nd config, 10.10.0.0/19, is both correct and as specific as possible.
On 5/24/07, Shamin <ccie.xpert@gmail.com> wrote:
>
> Dear All,
>
> I have a rather basic question. If someone can clear it off.
>
> I have the topology as below.
>
>
> Area 1 Area 0
> R2 <----------------------> R3 <---------------------> R4
>
> I am running Ospf Area 1 between R2 & R3 , and Area 0 between R3 & R4.
>
> R4 has 4 loopback interfaces with the following IP's advertised into Area
> 0
>
> 10.10.4.1
> 10.10.18.1
> 10.10.20.1
> 10.10.25.1
>
> The requirement is that, R2 sees a single route all these 4 networks.
> So we have to configure a area range command.
> Now my qestion is , If the question is that the summary should be as
> specific as possible,
> how will the summary configuration be like.
>
> The binary for the 3rd octet is as below,
> 4 - 00000100
> 18 - 00010010
> 20 - 00010100
> 25 - 00011001
>
> As per my understanding, we can configure to the summary to be till the
> 19th
> bit. i.e 255.255.224.0
>
> So should the configuration be on R3 as below:
>
> router ospf 1
> area 0 range 10.10.4.0 255.255.224.0
>
> OR
>
> router ospf 1
> area 0 range 10.10.0.0 255.255.224.0
>
>
> With the 1st config, the router gives a error, that of an Iconsistent
> mask.2nd config is accepted
>
> Can any one guide me as to which is the correct config and is my
> configuration meeting the requirement
> that the summary shoyld be as specific as possible.
>
> Regards
> All the best in your preprations
>
> Shamin
>
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-- Ronald Angello CCIE #17846
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