Allied Telesis AT-GS950/48 - Manual (Page 148)

Chapter 11: IGMP Snooping
148
5. In the Static Router Port row, select the check boxes for the ports that
you want to include or remove in the Static Router Port area. Selected
ports are indicated with a check mark.
To select all ports, click the All button under Static Router Port.
Note
To restore the original group member ports, click Restore.
6. Click Apply.
7. From the main menu on the left side of the page, select Save Settings
to Flash to permanently save your changes.