Multilayer Vlan Tandem Device Fast Topology, Fast Access Method And Platform Design

IEEE802.1Q-VLAN(Virtual Local Area Network),the standard of Virtual Local Area Network protocol, is a technology of realizing virtual workgroup through dividing the logic address of devices in a LAN into different network segment. It is independent of the LAN devices physical location, and be used to solve the problem of broadcasting in Ethernet. VLAN is helpful to control flow, simplify network management and improve the security of Local Area Network. IEEE802.1ad-QinQ is expanded on 802.1Q. This protocol allow encapsulate Consumer VLAN frame into Server VLAN frame, and then pass through the server's backbone network .It provide a simply two layer VPN tunnel for consumers. QinQ mainly solved the problem of building Consumer VLAN, so that it saved the tag source of Server VLAN.There are fewer applications for more than two layer VLAN tag, only few network testing devices provide more than two layer VLAN tag, but they are mostly nothing more than a research in theory or a technical application in special environment.This thesis based on comparing the leading technologies of Broad Band Subscriber Access in internal with international. I use the mature Ethernet VLAN communications technology, because it is fit for user's environment. And moreover, improve and innovated this protocol. Then a method for actualizing the separation of one user from another,fast access and topology is proposed ,the model in theory is established. Besides, we designed the hardware platform and testing network. Finally, a series of testing experimentation proved that this method is feasible and practicable. At present, the correlative theory and method of this research have gained invention patent.Using this method will be simple to the administration of networks. And it will be reduce the cost of network's maintenance and building. This method have universal significance, we can explore more applications base on it.