Transmission method and system for layered virtual private local area network business

The invention provides a transmission method and a system for a layered virtual private local area network business. The method comprises the following steps: a user-facing provider edge (UPE) router is interlinked with a network provider edge (NPE) router, and the network does not support the transmission function of a multi protocol label switch (MPLS) and a stacked VLAN (QINQ) technology, wherein every UPE is configured with an Ethernet network everything over IP (EoIP) channel connected with an NPE, and virtual exchange cases are hung under the NPE, wherein the method comprises the steps that: the NPE obtains the targeted media access control (MAC) address sent by the UPE as a first data packet of the MAC address of the device hung under the NPE; the NPE sends the first data packet; after receiving a second data packet fed back to the first data packet by the device, the NPE sends the second data packet to the UPE through the EoIP channel.