The IEEE 802.1ad is an Ethernet networking standard (OSI Layer II Data Link) informally known as QinQ additional feature to IEEE standard IEEE 802.1Q-1998. The 802.1ad was based on the 802.1Q standard in 2011. The technique is also known as provider bridging, Stacked VLANs, or simply QinQ or Q-in-Q. “Q-in-Q” can for supported devices apply to C-tag stacking on C-tag, and DrayTek – VLAN Tunneling mode (Ethernet Type = 0x8100). Refer to the image below stages of frame;

Normal frame without a VLAN tag:

With VLAN tag Frame 802.1Q:

With VLAN tag QinQ 802.1ad:


DrayTek VigorSwitches that support QinQ features are: G2280, G2500, P2121, P2280, and P2500 models.




In the layout, the Vigor2862 provides DHCP with a VLAN tag value of 100. It is connected to LAN port 24 in the VigorSwitch G2280 (Left). Then the G2280 (Left) LAN port 1 is connected to the G2280 (Right) in LAN port 1 with the Service VLAN tag value 1909. In the G2280 (right) two routers are connected, LAN port 23 is the Vigor2862Vac and LAN port 24 Vigor2133Vac.


Configuration of VigorSwitch G2280:

DrayTek G2280 (Left)

In the VigorSwitch G2280 (left), the setting for the VLAN Mode Tunneling (QinQ) menu page is on the Switch LAN >> VLAN Management >> Interface Setting. Select the following LAN ports to be “Tunneling mode,” i.e. GE1 and GE24. Assigned PVID value to 1909 and click Apply to save the settings.

VigorSwitch G2280 (Right)

Do the same on the VigorSwitch G2280(right).


Multi-VLAN tags with QinQ VLAN Tag;         

The Vigor2862 multiple VLAN tags screenshots:

Vigor2762Vac with the VLAN tag value 100


Vigor2862Vac with VLAN tag value of 200

Vigor2133Vac with the VLAN tag value of 300

QinQ with PPoE Vigor2860

Vigor2860 screenshot WAN1 >> Internet Access enable bridge mode on LAN2,

Vigor2133 screenshots;

Vigor2762Vac Screenshots

Written by : Edward Eroy