DES-3028 DES-3028P DES-3028G DES-3052 DES-3052P Layer 2 Fast Ethernet Managed Switch
QinQ
This function allows the user to enable or disable the
QinQ function. QinQ is designed for service providers to
carry traffic from multiple users across a network. QinQ
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. QinQ 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.
QinQ 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 L2 Features > QinQ.
Figure 7- 10. QinQ Global State Settings window
The following fields can be set:
Parameter Description
QinQ Global State
Use the pull down menu to Enable or Disable the QinQ Global State.
From Port…To Port
A consecutive group of ports that are part of the VLAN configuration starting with the selected
port.
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