This section describes the QinQ application details, including networking requirements, configuration roadmap, and data preparation, and provides related configuration files.
After a QinQ tunnel is configured, an enterprise can set up its own VLANs based on the QinQ tunnel. Branch offices of the same enterprise in different locations can communicate with each other through the VLANs. Offices of different enterprises cannot communicate.
This section provides an example for configuring selective QinQ. Selective QinQ is an extension to QinQ tunneling and is more flexible. When receiving packets, a selective QinQ-enabled interface adds different outer tags depending on the inner tags of the packets.
After QinQ-based VLAN tag swapping is configured on an interface, the interface swaps the inner and outer virtual local area network (VLAN) tags carried in double-tagged packets when receiving them. This configuration does not take effect on single-tagged packets.
This example shows how to configure a dot1q VLAN tag termination sub-interface to support proxy ARP, and how to enable the interworking between users who are on the same network segment but different VLANs.
This example shows how to configure a QinQ VLAN tag termination sub-interface to support proxy ARP, and how to enable the interworking between users who are on the same network segment but different VLANs.
This section describes how to ensure reliable and stable connections between users that send single-tagged packets and the network after you have configured a dot1q VLAN tag termination sub-interface to support Virtual Router Redundancy Protocol (VRRP).
This section describes how to ensure reliable and stable connections between users that send double-tagged packets and the network after you have configured a QinQ VLAN tag termination sub-interface to support VRRP (Virtual Router Redundancy Protocol).
This section describes how to configure a dot1q VLAN tag termination sub-interface to provide Layer 3 virtual private network (L3VPN) access and how to ensure that users communicate over the L3VPN using single-tagged packets.
This section describes how to configure a QinQ VLAN tag termination sub-interface to provide Layer 3 virtual private network (L3VPN) access and how to ensure that users communicate over the L3VPN using double-tagged packets.
This example shows how to configure the dot1q VLAN tag termination sub-interface to access a Layer 2 virtual private network (L2VPN). This configuration ensures that users communicate over the L2VPN using single-tagged packets.
This example shows how to configure the QinQ VLAN tag termination sub-interface to access a Layer 2 virtual private network (L2VPN). This configuration ensures that users communicate over the L2VPN using double-tagged packets.
This example shows how to configure the dot1q VLAN tag termination sub-interface to support Dynamic Host Configuration Protocol (DHCP) relay so that the DHCP relay agent transmits DHCP request packets from DHCP clients to a DHCP server. This configuration enables the clients to dynamically obtain IP addresses from the DHCP server.
This example shows how to configure the QinQ VLAN tag termination sub-interface to support Dynamic Host Configuration Protocol (DHCP) relay so that the DHCP relay agent transmits DHCP request packets from DHCP clients to a DHCP server. This configuration enables the clients to dynamically obtain IP addresses from the DHCP server.
This example shows how to configure the QinQ VLAN tag termination sub-interface to support the local connection. This configuration enables CEs to communicate with each other after being connected to the same virtual switching instance (VSI) on a PE through the sub-interface.
This example shows how to configure the QinQ stacking sub-interface to access a Layer 2 virtual private network (L2VPN). This configuration allows a physical interface to provide access services for multiple users.
You can configure a QinQ VLAN tag termination sub-interface to support Internet Group Management Protocol (IGMP) snooping on only Layer 2 interfaces rather than Layer 3 interfaces.
You can configure a dot1q VLAN tag termination sub-interface to support Internet Group Management Protocol (IGMP) on only the router's Layer 3 interfaces rather than Layer 2 interfaces.
This section provides an example of networking in which PE1 receives untagged packets carrying different differentiated services code point (DSCP) priorities. You can configure untagged+DSCP on the attachment circuit (AC)-side sub-interfaces of PE1 and bind these sub-interfaces to different virtual private network (VPN) instances. This configuration allows PE1 to forward packets to different VPN instances based on their DSCP priorities, differentiating services in VPN instances. In this example, the cell site gateway (CSG) transmits IP services.