QinQ protocol

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QinQ is a visual name of the tunnel protocol based on 802.1Q encapsulation. The QinQ protocol aims at encapsulating the VLAN tags of user private networks into VLAN tags of a public network. Packets carrying two tags traverse the backbone networks of service providers, therefore providing simple Layer 2 VPN tunnels for users. The QinQ protocol is simple and easy to manage. It does not require signaling support and can be implemented only through static configurations. It is especially applicable to small-scale enterprise networks that use Layer 3 switches at the backbone or small-scale metro networks. The QinQ protocol provides each user with a unique public VLAN ID and encapsulates the private network VLAN tag of the user into the public VLAN ID. The user private network VLAN tag is shielded on the public network during transmission, therefore greatly saving VLAN ID resources for service providers.

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QinQ protocol
QinQ is a visual name of the tunnel protocol based on 802.1Q encapsulation. The QinQ protocol aims at encapsulating the VLAN tags of user private networks into VLAN tags of a public network. Packets carrying two tags traverse the backbone networks of service providers, therefore providing simple Layer 2 VPN tunnels for users. The QinQ protocol is simple and easy to manage. It does not require signaling support and can be implemented only through static configurations. It is especially applicable to small-scale enterprise networks that use Layer 3 switches at the backbone or small-scale metro networks. The QinQ protocol provides each user with a unique public VLAN ID and encapsulates the private network VLAN tag of the user into the public VLAN ID. The user private network VLAN tag is shielded on the public network during transmission, therefore greatly saving VLAN ID resources for service providers.

What are QinQ and selective QinQ
Switch QinQ is also called port QinQ or Dot1q-tunnel. The port adds the default VLAN tag to packets no matter whether the packets carry VLAN tags. Selective QinQ indicates VLAN stacking. Different from port QinQ, selective QinQ encapsulates outer VLAN tags according to different VLANs.

Configure QinQ
QinQ (802.1Q-in-802.1Q) expands VLAN space by adding an additional 802.1Q tag to 802.1Q tag packets. It allows services in a private network to be transparently transmitted over a public network. A packet transmitted on the backbone network carries two 802.1Q tags: a public VLAN tag and a private VLAN tag. QinQ implementation falls into two types: basic QinQ and flexible QinQ. Basic QinQ is implemented based on an interface. After this feature is configured on an interface, the interface will attach a default local tag to packets it receives, regardless of whether the packets carry a VLAN tag. For details about the configuration procedure, choose Configuration > CLI-based Configuration > Ethernet Switching Configuration Guide > QinQ Configuration > Configuration Examples > Example for Confituring Basic QinQ through the URL: Product Documentation. Flexible QinQ is implemented based on a combination of interfaces and VLANs. After receiving packets, an interface may forward packets based on one tag or two taggs. For details about the configuration procedure, choose Configuration > CLI-based Configuration > Ethernet Switching Configuration Guide > QinQ Configuration > Configuration Examples > Example for Confituring Selective QinQ through the URL: Product Documentation.

QinQ
The QinQ technology allows services from the user side to be carried by the QinQ link on the network side. Multiple VLANs of the user network are encapsulated in QinQ mode into one VLAN in the transport network. In this manner, the VLAN resources in the transport network are saved. The QinQ technology is a VLAN stacking and nesting technology. Using the QinQ technology, data packets carry two layers of VLAN tags for the identification purpose. It removes the limit of the original solution in which only one layer of VLAN tag is used, extending the VLAN IDs.

Does the switch support QinQ
The S2700EI supports only basic QinQ configured using the port link-type dot1q-tunnel command, and does not support selective QinQ configured using the port vlan-stacking vlan command. The S2700SI does not support basic QinQ or selective QinQ. Other models support both basic QinQ and selective QinQ.

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