Preserve old URLs after upgrade from 1.9 to 2.1

Just wondering if anyone did this or, if Nop doesn't already have a mechanism that I am not aware of, to preserve the old URLs after the upgrade from 1.9 to 2.1.

1.9 version had the old URL style of type

<store>/products/9127-prod-name.aspx etc ...

and I was wondering if anyone did anything or found a solution to have those old type of URLs working in version 2.1 along the new formats that use ASP.NET routing.

thanks

All old 1.X URLs are preserved in the 2.X versions

that is more than fantastic!

I used to loose all references when upgrading in the past... this is really nice to have.