xStack DES-3528 Series Layer 2 Stackable Fast Ethernet Managed Switch User Manual
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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 > QinQ Settings.
Figure 7- 12. QinQ Settings window
The following fields can be set:
Parameter Description
From Port…To Port
A consecutive group of ports that are part of the VLAN configuration starting with the selected
port.
Role
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.
Missdrop
Use the drop down menu to enable or disable missdrop. If missdrop is enabled, the packet
that does not match an
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