Advantech EKI-7712G-4FMPI, User Manual

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EKI-7712G-4FMPI User Manual 52
Figure 4.28 L2 Switching
>
802.1Q VLAN
>
Port-VLAN Mapping
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
.
Figure 4.29 L2 Switching > Q-in-Q > Global Settings
Item Description
Port Displays the interface entry for the port.
Mode Displays the VLAN mode for the port.
Administrative
VLANs
Displays the administrative VLAN list of the port.
Operational VLANs Displays the operational VLAN list of the port.