Dell MXL 10GbE Reference Manual page 1330

Dell(config)#interface tenGigabitethernet 8/0
Dell(conf-if-te-10/0)#no shutdown
Dell(conf-if-te-10/0)#portmode hybrid
Dell(conf-if-te-10/0)#switchport
Dell(conf-if-te-10/0)#vlan-stack trunk
Dell(conf-if-te-10/0)#exit
Dell(config)#interface vlan 20
Dell(conf-if-vlan)#vlan-stack compatible
Dell(conf-if-vlan)#member Gi 7/0, Gi 3/10, TenGi 8/0
Dell(conf-if-vlan)#exit
Dell(config)#interface vlan 20
Dell(conf-if-vlan)#untagged TenGi 8/0
Dell(conf-if-vlan)#exit
Dell(config)#
Dell(config)#interface vlan 40
Dell(conf-if-vlan)#tagged TenGi 8/0
Dell(conf-if-vlan)#exit
Dell(config)#
1330
VLAN Stacking