Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module FTOS Command Line Referen - Page 655

37 VLAN Stacking Overview With the virtual local area network (VLAN)-stacking feature (also called stackable VLANs and QinQ), you can "stack" VLANs into one tunnel and switch them through the network transparently. The VLAN stacking commands described in this chapter are: • dei enable • dei honor • dei mark • member • show interface dei-honor • show interface dei-mark • vlan-stack access • vlan-stack compatible • vlan-stack dot1p-mapping • vlan-stack protocol-type • vlan-stack trunk For information about basic VLAN commands, refer to Virtual LAN (VLAN) Commands in the Layer 2 chapter. Important Points to Remember • If the spanning tree protocol (STP) is not enabled across the stackable VLAN network, STP bridge protocol data units (BPDUs) from the customer's networks are tunneled across the stackable VLAN network. • If STP is enabled across the stackable VLAN network, STP BPDUs from the customer's networks are consumed and not tunneled across the stackable VLAN network unless you enable the tunneling protocol. • Layer 3 protocols are not supported on a stackable VLAN network. • Assigning an IP address to a stackable VLAN is supported when all the members are only stackable VLAN trunk ports. IP addresses on a stackable VLAN-enabled VLAN is not supported if the VLAN contains stackable VLAN access ports. This facility is provided for the simple network management protocol (SNMP) over a stackable VLAN-enabled VLAN containing only stackable VLAN trunk interfaces. Layer 3 routing protocols on such a VLAN are not supported. VLAN Stacking | 655