VPWS Access Through a Termination Sub-interface
Virtual private wire service (VPWS) access through a termination sub-interface for QinQ VLAN tag termination means that VPWS functions are configured on the sub-interface for QinQ VLAN tag termination. By configuring the range of double VLAN tags on the sub-interface for QinQ VLAN tag termination on a PE, users within the VLAN tag range are allowed to access VPWS. A local device can transparently transmit user packets with double VLAN tags to a remote device for authentication. The remote device is usually a Broadband Remote Access Server (BRAS).
Figure 1 shows a typical networking for VPWS access through a sub-interface for QinQ VLAN tag termination.
