I just recently did something similar, which you would need to do on a larger scale.  - I connected 2 old workstations on the first switch, downloaded jperf 2.0.2  (current edition) and set it up in server mode.  -On the 2nd switch I had 2 laptops running jperf in client mode (5  - 10 parallel streams, Buffer Length = 1 MByte, output set to Mbit, and ran it for 10 minutes).  -One laptop connected to jperf server 1, the second laptop connected to jperf server 2.  I then monitored the bandwidth on each port using my network monitoring software.  If you don't have network monitoring software, use cli commands or switch gui! /Nick 
Hi, I want to test the througput of  an inter-switch trunk, only two 5448 switches are involved. On each switch five 1GbE switchports (in a LAG) are connected.  Regards, Rodge
Througput Inter-Switch Trunk