Traffic shaping

Hi,

If I set  reverse shaper , and the source initiate a download  session with the destination ,

What will be the additional field in the ipv4 packet header 

for example if the bandwidth is set 50Mbps ,when the fortigate firewall will add the additional field 

Sorry for my english .

Second My internet router is single multihomed ( from my single  router to different ISP )  each isp providing 50Mbps , so the total 100 Mbps. vlan 100 is downloading from  ISP1  and vlan 2000 from ISP2  So if I want to set the policy for both vlan  how the traffic shaper should be  ? Thanks