Configuring VLAN transparent transmission

When basic QinQ is enabled on a port, all packets passing through the port are tagged with the port's PVID tag. However, by configuring the VLAN transparent transmission function on a port, you can specify the port not to add its PVID tag to packets carrying specific inner VLAN tags when they pass through it, so that these packets are transmitted in the service provider network with single tags.

Configuration restrictions and guidelines

When you are configuring transparent transmission for a VLAN, you must configure all the devices on the transmission path to permit packets of this VLAN to pass through.
For VLANs whose packets are to be transparently transmitted through a port, do not configure VLAN mapping for them on the port. For more information about VLAN mapping, see "Configuring VLAN mapping."

Configuration procedure

To configure VLAN transparent transmission:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter interface view or port group view.	Enter Layer 2 Ethernet interface view or Layer 2 aggregate interface view:interface interface-type interface-number Enter port group view:port-group manual port-group-name	Use either command.
3. Configure the link type of the ports.	port link-type { hybrid \| trunk }	N/A
4. Configure the ports to allow packets from its PVID and the transparent VLANs to pass through.	When the ports are hybrid ports:port hybrid vlan vlan-id-list { tagged \| untagged } When the ports are trunk ports:port trunk permit vlan { vlan-id-list \| all }	Use either command.
5. Enable basic QinQ on the ports.	qinq enable	By default, basic QinQ is disabled on ports.
6. Configure VLAN transparent transmission on the ports.	qinq transparent-vlan vlan-list	By default, VLAN transparent transmission is not configured.

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