Configuring QinQ

QinQ must be configured on all the devices and ports participating in the provider bridge. Typically, customer facing ports are configured as untagged members of S-VLANs and provider facing ports are configured as tagged members of S-VLANs. Per the IEEE 802.1ad specification, there is no condition binding port types (customer or provider) to untagged or tagged S-VLAN memberships. Therefore, when configuring QinQ tunnelling on the switch, you would first configure per-port S-VLAN membership (tagged or untagged), and then configure the port type as customer-network or provider-network, depending on the device to which the switch port is connected.


	NOTE: A customer-network port can receive S-VLAN tagged frames if the customer and provider agree on the S-VID association for that customer and the customer device is capable of sending S-VLAN tagged frames. Configuring QinQ with S-VLANs in a switch stack is not supported. For more information, see Effects of QinQ on other switch features.

To configure QinQ take the following steps on all participating provider switches:

Enable QinQ on the device, selecting the appropriate QinQ mode (S-VLAN or mixed VLAN mode).
Save the configuration and reboot the switch.
Configure S-VLANs and assign per port VLAN membership.
Configure port-types for all of the switch ports that carry QinQ traffic across the network.
(Optional) Assign priorities to traffic passing through the provider network.


	CAUTION: A reboot is required to enable/disable QinQ operations on the switch. When moving between QinQ modes (`qinq mixedvlan` to `qinq svlan` or vice versa), the switch boots up with a default configuration for the new qinq mode and the configuration parameters of the current mode will be erased.

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