I have two dell n4032s. One is for servers and the other is for servers and iscsi traffic on separate vlans. I want to enable jumbo frames for the iscsi vlan. Do I do this by physical interface or by vlan interface? I think it's by physical interface but I can't figure out how to do it. The reason I don't want to enable it globally is because there are servers on a different vlan that would be affected. I also have a 20gb LAG between the two n4032s and the other switch will have a mtu of 1500 and I don't want packets to get dropped.