Data formarding method for implementing virtual channel transmission in LAN

Abstract

A data forwarding method for realizing local area network virtual channel transmission, comprising the following steps: first judging whether a data packet arrives at an interface of a device, and checking the frame check code of the data packet, and secondly judging whether the type of the incoming data packet matches the type of the input interface , and check whether the "label forwarding information data table" clearly indicates the output interface of the data packet or the VLAN ID of the output data packet according to the input interface or input data packet, and the device completes according to the instructions of the "label forwarding information data table". When data packets are exchanged between any two interfaces of the device, the virtual local area network identification VLAN ID is exchanged according to the specified. The present invention breaks through the limitations of LAN networking caused by the lack of VLAN IDs stipulated by IEEE802.1Q, and realizes the end-to-end interconnection of large-scale VLANs at low cost without using new communication protocols under the existing relevant protocols of the LAN. , it can not only support centralized broadband LAN access, but also provide LAN VPN and PPPOE access services at the same time, and network operators do not need to increase the cost of learning new technologies.

Description

technical field [0001] The invention relates to a data forwarding method for realizing transmission of a local area network virtual channel. Background technique [0002] In the IEEE 802.1Q standard, 12 bits in the Ethernet frame are used to identify the virtual local area network VLAN, that is, the range of the virtual local area network identification VLAN ID is 0 to 4095. In the construction of the metropolitan area network, a large number of users access the Internet through LAN access. In order to isolate these users, these users must be divided into independent virtual local area network VLANs. Each VLAN is identified by a VLAN ID. VLAN IDs must be unique in the entire LAN network and are network-wide variables. Therefore, VLAN ID resources cannot meet the needs of telecom operators. In order to solve the problem of lack of vlan id, the current methods mainly include: 1. Adopt end-to-end (transparent) transmission of LAN on MPLS, so that the problem of VLAN ID is not ...

AI Technical Summary

Problems solved by technology

[0003] For mode 1, an MPLS network must be established. On the one hand, it increases the operation and maintenance costs of the network operator (because it is a brand new network, resulting in increased network complexity, involving a large number of training, high personnel requirements, etc.); Additional tags are added to LAN or VLAN datagrams, which reduces network transmission efficiency and network stability

[0004] For method 2, the centralized broadband LAN access required by the network operator cannot be completed, and it is very difficult to provide LAN VPN and PPPOE access services simultaneously

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