From Extreme Control Center->Administration->Scripting
Select from screen Plain Text (1), and enter the text below (2) that will be executed on the device
After commands are entered, click Save As
Select the Permissions and Menu Items for the script
Select Save and you be prompted to name the script
Click on Run
You will be asked to select the Devices to run the script against. Select them and Click on Right Arrow -> To move them to left pane
Click Next, you will have the choice to run as a task , or run immediately. For brevity I selected immediately. The item is still saved.
Click Next and verify details, that you are running against he correct devices. Then if so, click Run.
You should see output of settings in Results window. I have ommited actual results.