A method for isolating transparent transmission virtual LAN data, which contains network switching chip, establishing data channel for message using ACL rule, dividing multi - VLAN according to group and distributing to each retransmission terminal. When receiving message, network switching chip extracting VLAN ID and compared with ACL rule, if they are equal then transmitting message to retransmission terminal corresponded with ACL rule data otherwise compared with next ACL rule data, if VLAN ID and all of ACL rule data are not equal, then dropping message. Said invention makes uplink equipment realizing subscriber access and identify to multi - subscriber access through increasing network switching chip number. |