C
HAPTER
36
| VLAN Commands
Configuring IEEE 802.1Q Tunneling
– 847 –
Limitations for QinQ
â—† 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.
â—† IGMP Snooping should not be enabled on a tunnel access port.
â—† 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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