C
HAPTER
36
| VLAN Commands
Configuring IEEE 802.1Q Tunneling
– 847 –
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 (849)
show interfaces switchport (781)
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.
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