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Hi Benjamin: I think that the following link will give you an idea for what you need to know: http://www.cisco.com/warp/customer/620/roadmap_b.shtml This is for the naming: http://www.cisco.com/en/US/products/sw/iosswrel/ps1818/products_tech_note09186a0080101cda.shtml In this case 11.1CC goes to 12.0T and 12.0T migrate to 12.1 mainline. Do not you worry you will not loose anything with the new