2-12 Selective QinQ ConfigurationWhen configuring selective QinQ, go to these sections for information you are interested in:z Selective QinQ Overviewz Selective QinQ Configurationz Selective QinQ Configuration ExampleSelective QinQ OverviewSelective QinQ OverviewSelective 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 outerVLAN tags to the packets with different inner VLAN tags.The selective QinQ feature makes the service provider network structure more flexible. You can classifythe terminal users on the port connecting to the access layer device according to their VLAN tags, andadd different outer VLAN tags to these users. In the public network, you can configure QoS policiesbased on outer VLAN tags to assign different priorities to different packets, thus providing differentiatedservices. See 0 for details.Figure 2-1 Diagram for a selective QinQ implementationVIPVLAN101~200UserVLAN8 ~100IP PhoneVLAN201~300VLAN 8~300VLAN 1001~1003ServerVLAN8~100VIP ServerVLAN101~200VoIP DeviceVLAN201~300SwitchAPublic NetworkVLAN1001/1002/1003In this implementation, Switch A is an access device of the service provider. The users connecting to itinclude common customers (in VLAN 8 to VLAN 100), VIPs (in VLAN 101 to VLAN 200), and IP
