It might be helpful to know that with later IOSs, you can cause OSPF
to advertise loopbacks with their configured mask instead of as a host route
if you add the command ip ospf network point-to-point under the loopback
interface configuration. With ip ospf network point-to-point, the /32 will not
longer be advertised and the loopback will not be treated as a stub network.
Not sure why anyone
would use something besides /32 for a loopback in production, but this feature
does work well for lab scenarios when you are trying to simulate larger subnets
via loopbacks.
L.L. Dygowski
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