Q-In-Q; Figure 4.25 L2 Switching > Q-In-Q > Global Settings - Advantech EKI-7708 Series User Manual

4.5.4.4 Port-VLAN Mapping
To access this page, click L2 Switching > 802.1Q VLAN > Port-VLAN Mapping.
The ensuing table for Port-VLAN Mapping Table settings are informational only:
Port, Mode, Administrative VLANs and Operational VLANs.
4.5.5

Q-in-Q

Q-in-Q is commonly referred as VLAN stacking in which VLANs are nested by adding
two tags to each frame instead of one. Network service provider and users both can
use VLANs and makes it possible to have more than the 4094 separate VLANs
allowed by 802.1Q.
There are three ways in which a machine can be connected to a network carrying
double-tagged 802.1ad traffic:

via a untagged port, where both inner and outer VLANs are handled by the
switch or switches (so the attached machine sees ordinary Ethernet frames);

via a single-tagged (tunnel) port, where the outer VLAN only is handled by the
switch (so the attached machine sees single-tagged 802.1Q VLAN frames); or

via a double-tagged (trunk) port, where both inner and outer VLANs are handled
by the attached machine (which sees double-tagged 802.1ad VLAN frames).
4.5.5.1 Global Settings
The Global Settings page allows you to set the outer VLAN Ethertype setting.
To access this page, click L2 Switching > Q-in-Q > Global Settings.
The following table describes the items in the previous figure.
Item
Outer VLAN
Ethertype
Apply
The ensuing table for QinQ Global Information settings are informational only:
Outer VLAN Ethertype.
EKI-7708 Series User Manual
Figure 4.25 L2 Switching > Q-in-Q > Global Settings
Description
Enter the outer VLAN handled by the switch giving the attached
machine a single-tagged 802.1Q VLAN frame.
Click Apply to save the values and update the screen.
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