QinQ and its application value

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As Ethernet technologies are widely used on carrier networks (metro Ethernet networks), the standard VLAN defined in IEEE 802.1q alone cannot completely distinguish between users or isolate a large number of users. This is because the 12-bit VLAN tag field defined in IEEE 802.1q identifies a maximum of only 4096 VLANs.
To expand VLAN tags in quantity, the QinQ technology is developed. It adds another 802.1q tag to a packet that already carries an 802.1q tag. With this technology, the system supports up to 4096 x 4096 VLANs. As metro Ethernet develops and a greater variety of services are deployed, there are more scenarios in which QinQ double tags can be applied. The inner tag (C-VLAN) indicates the user, and the outer tag (SVLAN) indicates the service.

Other related questions:
ROADM and its application scenarios
The ROADM technology achieves reconfiguration of wavelengths by adjusting the pass-through or block status of the wavelengths, making the static distribution of wavelength resources flexible and dynamic. ROADM with the U2000 can remotely and dynamically adjust the status of wavelength adding/dropping and passing through for a maximum of 80 wavelengths. Huawei ROADM technology can be applied to the following scenarios: 1-degree optical-layer grooming: Generally it applies to a terminal node and services are not interrupted during expansion. 2-degree optical-layer grooming: It achieves service transmission in two directions. 3-degree optical-layer grooming: It achieves service transmission in three directions. 4-degree optical-layer grooming: It achieves service transmission in four directions. 9-degree optical-layer grooming: It achieves service transmission in nine directions.

Aggregation interruption function and its application scenario
Visit the following website to find out what the aggregation interruption function is used for and when should this function be enabled: FAQ-What is the aggregation interruption function used for? When should this function be enabled

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.

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