Chapter 17 Traffic Shaping for FortiOS 5.0 : Traffic shaping methods : Shared policy shaping
  
Shared policy shaping
Traffic shaping by security policy enables you to control the maximum and/or guaranteed throughput for a selected security policy. When configuring a shaper, you can select to apply the bandwidth shaping per policy or for all policies. Depending on your selection, the FortiGate unit will apply the shaping rules differently.
See also 
Shared traffic shaper configuration settings
Per policy
All policies
Maximum and guaranteed bandwidth
Traffic priority
Per-IP shaping
Application control shaping
Enabling in the security policy
Type of Service priority
Differentiated Services
Tos and DSCP mapping
Traffic Shaper Monitor