Selective Qinq Configuration; Selective Qinq Overview - 3Com WX3000 Series Operation Manual

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Selective QinQ Configuration

Selective QinQ Overview

Selective QinQ Overview
Selective QinQ is an enhanced application of the VLAN-VPN feature. With the selective QinQ feature,
you can configure inner-to-outer VLAN tag mapping, according to which you can add different outer
VLAN tags to the packets with different inner VLAN tags.
The selective QinQ feature makes the service provider network structure more flexible. You can classify
the terminal users on the port connecting to the access layer device according to their VLAN tags, and
add different outer VLAN tags to these users. In the public network, you can configure QoS policies
based on outer VLAN tags to assign different priorities to different packets, thus providing differentiated
services. See Figure 2-1
Figure 2-1 Diagram for a selective QinQ implementation
In this implementation, Switch A is an access device of the service provider. The users connecting to it
include common customers (in VLAN 8 to VLAN 100), VIPs (in VLAN 101 to VLAN 200), and IP
telephone users (in VLAN 201 to VLAN 300). Packets of all these users are forwarded by Switch A to
the public network.
After the selective QinQ feature and the inner-to-outer tag mapping feature are enabled on the port
connecting Switch A to these users, the port will add different outer VLAN tags to the packets according
to their inner VLAN tags. For example, you can configure to add the tag of VLAN 1002 to the packets of
IP telephone users in VLAN 201 to VLAN 300 and forward the packets to the VoIP device, which is
responsible for processing IP telephone services.
To guarantee the quality of voice packet transmission, you can configure QoS policies in the public
network to reserve bandwidth for packets of VLAN 1002 and forward them preferentially.
for details.
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