Dell Force10 MXL Blade - VLAN Stacking; Overview; Important Points to Remember; VLAN Stacking Commands

VLAN Stacking | 655
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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.