Technical information

Watson SHDSL Router
Web-based Management Manual
Watson-SHDSL-Router-GUI-Manual.doc
Version 2.3-03
9-62
Revision: 2012-02-29
9.4.10.7 Stacked VLAN Mode
A service provider can use VLAN stacking to allow it to distinguish multiple custom-
ers VLANs, even those with the same (customer-assigned) VLAN ID, within its net-
work.
Use VLAN stacking to add an outer VLAN tag to the inner IEEE 802.1Q tagged
frames that enter the network. By tagging the tagged frames ("double-tagged"
frames) , the service provider can manage up to 4,094 VLAN groups with each
group containing up to 4,094 customer VLANs. This allows a service provider to
provide different service, based on specific VLANs, for many different customers.
A service provider's customer may require a range of VLANs to handle multiple ap-
plications. A service provider's customer can assign his own inner VLAN tags on
ports for these applications. The service provider can assign an outer VLAN tag for
each customer. Therefore, there is no VLAN tag overlap among customers, so traf-
fic from different customers is kept separate.
The bridging section allows you to select the VLAN stacking mode:
Stacked VLAN Mode Select one of the following Stacked VLAN Mode op-
tions from the drop-down menu:
 Disabled
 Rule Based
 Transparent
 Port Based
Note that the screen will refresh to display relevant configuration settings ac-
cording to your choice.
Disabled Select ‗Disabled' if you you want to turn off stacked VLAN
mode.
Transparent Select ‗Transparent‘ if you want to enable VLAN stacked
frames (―double-tagged‖ frames) to be transparently bridged through the device
Figure 9-93: Transparent Mode
The ‗Management VID‘ defines the VLAN ID of the outer VLAN which is re-
served for managing the device.
Rule Based Select ‗Rule Based‘ if you want to add an outer VLAN tag to
frames which match a set of rules.