I don't know the "right" answer to your question, but unless asked to,
or implicitly asked, I would not change any IP's/subnet masks.

On Sat, Jul 16, 2011 at 3:42 PM, Bob McCouch <[email protected]> wrote:
> Hi all,
>
> Doing some reading on EIGRP today and came across a note about how two
> EIGRP peers can (unlike OSPF) form a neighbor adjacency even with
> mismatched IP subnet masks, on the condition that both peers agree
> that the other is within their understanding of the subnet definition.
> So the example was that two routers addressed with 10.1.1.1/24 and
> 10.1.1.2/30, respectively, would neighbor up.
>
> OK, fine, so this leads to my question: On the lab let's say I had a
> task to enable EIGRP for network 10.1.1.0 (mask unspecified...) on the
> two routers with the IP addresses in my example above. Simply
> configuring:
>
> router eigrp 1
>  no auto
>  network 10.1.1.x 0.0.0.0
>
> Would work, and the neighbor adjacency should form. ASSUMING for the
> moment that no subsequent task would require me to fix the mask
> mismatch, should I fix it? I realize there could be other implicit
> requirements in this case that could force me to fix the mask, but the
> general question stands: should I fix something that is "wrong", but
> works?
>
> Thanks!
>
> Sent from my iPad
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