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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