Summary of VLAN Termination Configuration Tasks

Table 1 describes the VLAN termination configuration tasks. The configuration tasks can be performed in any sequence.

**Table 1** VLAN termination configuration tasks
Configuration Task	Applicable Scenario
Configuring a Dot1q Termination Sub-interface to Implement Inter-VLAN Communication	A Layer 3 switch connects to user hosts residing in different VLANs through a Layer 3 Ethernet interface, and these user hosts need to communicate with each other.
Configuring a Dot1q Termination Sub-interface and Connecting It to an L2VPN	A carrier's network provides the L2VPN service for users. PEs function as user access devices and connect to CEs through sub-interfaces to access user networks. The data packets that CEs send to PEs carry a single VLAN tag. User networks are required to interwork with each other.
Configuring a Dot1q Termination Sub-interface and Connecting It to an L3VPN	A carrier's network provides the L3VPN service for users. PEs function as user access devices and connect to CEs through sub-interfaces to access user networks. The data packets that CEs send to PEs carry a single VLAN tag. User networks are required to interwork with each other.
Configuring a QinQ Termination Sub-interface and Connecting It to an L2VPN	A carrier's network provides the L2VPN service for users. PEs function as user access devices and connect to CEs through sub-interfaces to access user networks. The data packets that CEs send to PEs carry double VLAN tags. User networks are required to interwork with each other.
Configuring a QinQ Termination Sub-interface and Connecting It to an L3VPN	A carrier's network provides the L3VPN service for users. PEs function as user access devices and connect to CEs through sub-interfaces to access user networks. The data packets that CEs send to PEs carry double VLAN tags. User networks are required to interwork with each other.