Users Guide
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VLAN Stacking
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 Dell Networking operating software supports this feature on Dell Networking OS.
For more information about basic VLAN commands, refer to the Virtual LAN (VLAN) Commands section in the Layer 2 chapter.
Important Points to Remember
• If you do not enable the spanning tree protocol (STP) across the stackable VLAN network, STP bridge protocol data units
(BPDUs) from the customer’s networks are tunneled across the stackable VLAN network.
• If you do enable STP 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 protocol tunneling.
NOTE: For more information about protocol tunneling on the E-Series, refer to Service Provider Bridging.
• 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 are not supported if the VLAN contains stackable VLAN access ports. This
facility is provided for the simple network management protocol (SNMP) management over a stackable VLAN-enabled VLAN
containing only stackable VLAN trunk interfaces. Layer 3 routing protocols on such a VLAN are not supported.
• Dell Networking recommends that you do not use the same MAC address, on dierent customer VLANs, on the same stackable
VLAN.
• Interfaces congured using stackable VLAN access or stackable VLAN trunk commands do not switch trac for the default
VLAN. These interfaces are switch trac only when they are added to a non-default VLAN.
• Starting with Dell Networking OS version 7.8.1 for C-Series and S-Series (Dell Networking OS version 7.7.1 for E-Series, 8.2.1.0 for
E-Series ExaScale), a vlan-stack trunk port is also allowed to be congured as a tagged port and as an untagged port for single-
tagged VLANs. When the vlan-stack trunk port is also a member of an untagged vlan, the port must be in Hybrid mode. Refer to
portmode hybrid.
dei enable
Make packets eligible for dropping based on their DEI value.
Syntax
dei enable
Defaults Packets are colored green; no packets are dropped.
Command Modes CONFIGURATION
Command History
This guide is platform-specic. For command information about other platforms, refer to the relevant Dell
Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
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VLAN Stacking