[c-nsp] OSPF LSA Type 3 / 5 question ...

[Fabio Mendes]

If I understood correctly you are generating an IA LSA via the area range
command on the ABR and are also receiving a E1/2 LSA for a /24 that is part
of the IA range and want to mask it behind that same IA LSA.

One simple way to do it is use the summary command under the ospf process,
announcing a 10.0.0.0/8 to the backbone area.

Now the backbone has an IA for 10.0.0.0/8 and a E1/2 for the same prefix.

In that case the IA will be preferred.

Since the 10.100 subnet is behind the same ABR that's generating the
10.0.0.0/8 IA into the backbone, you will not have any connectivity
problems by doing that.