The SASU program provides your customers with everything the SAS program provides, with the addition of major software releases or update licenses.

A major release typically has enhanced functions and may contain bug fixes from prior versions. Major releases can include items such as significant functionality enhancements, new licenses, and additional media (including CDs) and documentation. Major releases are available via the Product Upgrade Tool (PUT) that your customers can access through Cisco.com:

http://www.cisco.com/upgrade