D-Link DAS-3626 User Manual page 34

Q-in-Q Settings
This function allows the user to enable or disable the Q-in-Q function. Q-in-Q is designed for service providers to carry
traffic from multiple users across a network. Q-in-Q is used to maintain customer specific VLAN and Layer 2 protocol
configurations even when the same VLAN ID is being used by different customers. This is achieved by inserting
SPVLAN tags into the customer's frames when they enter the service provider's network, and then removing the tags
when the frames leave the network.
Customers of a service provider may have different or specific requirements regarding their internal VLAN IDs and the
number of VLANs that can be supported. Therefore customers in the same service provider network may have VLAN
ranges that overlap, which might cause traffic to become mixed up. So assigning a unique range of VLAN IDs to each
customer might cause restrictions on some of their configurations requiring intense processing of VLAN mapping
tables which may exceed the VLAN mapping limit. Q-in-Q uses a single service provider VLAN (SPVLAN) for
customers who have multiple VLANs. Customer's VLAN IDs are segregated within the service provider's network
even when they use the same customer specific VLAN ID. Q-in-Q expands the VLAN space available while preserving
the customer's original tagged packets and adding SPVLAN tags to each new frame.
To view this window, click Switch Configuration > QinQ as shown below:
The following fields can be set:
Parameter
From Port / To Port
Role
Missdrop
Outer TPID
Use Inner Priority
Add Inner Tag(hex:
0x1-0xffff)
Click Apply to implement changes.
DAS-3626 VDSL2 Switch User Manual
Figure 38. QinQ Settings menu
Description
A consecutive group of ports that are part of the VLAN configuration starting with the selected
port.
The user can choose between UNI or NNI role.
UNI – To select a user-network interface which specifies that communication between the
specified user and a specified network will occur.
NNI – To select a network-to-network interface specifies that communication between two
specified networks will occur.
Use the drop down menu to enable or disable missdrop. If missdrop is enabled, the packet
that does not match any assignment rule in the Q-in-Q profile will be dropped. If disabled, then
the packet will be assigned to the PVID of the receiving port.
The Outer TPID is used for learning and switching packets.
The priority given to the inner tag will be copied to the outer tag if this setting is enabled.
Specify whether to add inner tag for ingress untagged packets. If set, the inner tag will be
added for the ingress untagged packets and thus the packets egress to the NNI port will be
double tagged.
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