Q-In-Q - Advantech EKI-7428G Series User Manual

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ANAGING WITCH
The following table describes the items in the previous figure.
Table 4-22. L2 Switching > 802.1Q VLAN > Port to VLAN
Item
Port
Interface VLAN
Mode
Membership
Apply
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).
53
Displays the assigned port to the entry.
Displays the assigned mode to the listed VLAN port.
Hybrid: Port hybrid model.
Access: Port hybrid model.
Trunk: Port hybrid model.
Tunnel: Port hybrid model.
Displays the assigned membership status of the port entry, options include:
Forbidden, Excluded Tagged or Untagged.
Click Apply to save the values and update the screen.
Description