Basic QinQ enables the switch to add a public tag to user packets so that they can be forwarded on the public network. To separate private networks from the public network and conserve VLAN resources, configure double 802.1Q tags on QinQ interfaces of the device. Private VLAN tags are used on private networks such as enterprise networks, and public VLAN tags are used on external networks such as carrier networks. Basic QinQ expands VLAN space to up to 16.7 million (4094 x 4094) and allows packets on different private networks with the same VLAN ID to be transparently transmitted.
The system view is displayed.
A VLAN used on the public network is created.
Exit from the VLAN view.
The interface view is displayed.
The interface can be a physical interface or an Eth-Trunk interface.
The link type of the interface is set to dot1q-tunnel.
By default, the link type of an interface on the S2720-EI, S5720I-SI, S5720-LI, S5735-L, S5735S-L, S5735S-L-M, S5720S-LI, S5720S-SI, S5720-SI, S5735-S, S5735S-S, S5735-S-I, S5730S-EI, S5730-SI, S6720-LI, S6720S-LI, S6720S-SI, and S6720-SI is negotiation-auto, and the link type of an interface on other models is negotiation-desirable.
Dot1q-tunnel interfaces do not support Layer 2 multicast.
The VLAN ID of the public VLAN tag, that is, the default VLAN ID of the interface, is configured.
By default, VLAN 1 is the default VLAN of all interfaces.