In releases 6.0 and later, a new traffic-shaping engine manages all the traffic on your WAN links, in both the incoming and outgoing directions. It replaces the previous system, Repeater QoS, which operated only on accelerated traffic and in the sending direction only.
When upgrading an appliance from release 5.x to release 6.x, any Repeater QoS definitions are automatically converted to traffic-shaping policies. For example, if a QoS category of "Queue A" was assigned 30% of the link in release 5.x, this category is converted into a traffic-shaping policy called "Queue A" with a priority of 30.
For the release 5.x default case, in which 100% of the link is assigned to Queue A, no conversion is done. The release 6.0 defaults are used instead.