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Limitations for QinQ
• The native VLAN for the tunnel uplink ports and tunnel access ports cannot be the
same. However, the same service VLANs can be set on both tunnel port types.
• IGMP Snooping should not be enabled on a tunnel access port.
• If the spanning tree protocol is enabled, be aware that a tunnel access or tunnel
uplink port may be disabled if the spanning tree structure is automatically
reconfigured to overcome a break in the tree. It is therefore advisable to disable
spanning tree on these ports.
dot1q-tunnel system-tunnel-control
This command sets the switch to operate in QinQ mode. Use the no form to disable
QinQ operating mode.
Syntax
[no] dot1q-tunnel system-tunnel-control
Default Setting
Disabled
Command Mode
Global Configuration
Command Usage
QinQ tunnel mode must be enabled on the switch for QinQ interface settings
to be functional.
Example
Console(config)#dot1q-tunnel system-tunnel-control
Console(config)#
Related Commands
show dot1q-tunnel (34-17)
show interfaces switchport (27-11)
switchport dot1q-tunnel mode
This command configures an interface as a QinQ tunnel port. Use the no form to
disable QinQ on the interface.
Syntax
switchport dot1q-tunnel mode {access | uplink}
no switchport dot1q-tunnel mode
• access – Sets the port as an 802.1Q tunnel access port.
• uplink – Sets the port as an 802.1Q tunnel uplink port.
Default Setting
Disabled
Configuring IEEE 802.1Q Tunneling
34
34-15
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