DGS-3700-12/DGS-3700-12G Series Layer 2 Gigabit Ethernet Switch User Manual

Figure 3 - 12 VLAN Precedence Settings window

The following parameters can be configured:

Parameter Description

From Port / To Port

Specify the port or range of ports you wish to configure.

 

 

VLAN Precedence

Use the drop down menu to select the VLAN precedence, choose either MAC Based VLAN or

 

Subnet VLAN.

 

MAC Based VLAN – Specifies that the MAC-based VLAN classification is given precedence

 

over the subnet VLAN classification.

 

Subnet VLAN – Specifies that the subnet VLAN classification is given precedence over the

 

MAC-based VLAN classification.

 

 

Click Apply to implement changes made.

Q-in-Q

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 L2 Features > QinQ > QinQ Settings as shown below:

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D-Link DGS-3700 user manual In-Q Settings, Vlan Precedence