What you have found is not an issue with the 2521 (they are wonderful machines) but is a consistent (but not well known or well understood) behavior of IOS. IOS uses a somewhat different set of rules for LAN interfaces (like Ethernet) and for point to point serial interfaces. Your assumption that you should get an error message about overlapping addresses is quite true for LAN interfaces. But for serial point to point interfaces it is allowed. I have never seen an authoritative explanation of why this is, but I have observed (for a long time) that this is a consistent behavior. So it is not a bug, it is a feature :)
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.