Method and system for realizing VLAN (Virtual Local Area Network) QinQ

Abstract

The invention relates to a method and system for realizing VLAN (Virtual Local Area Network) QinQ. The method comprises the following steps that: an exchange chip receives a data message, inquires a VLAN ID conversion table, converts the VLAN ID of the data message according to a converting rule in the VLAN ID conversion table and transmits the converted data message to a pon chip; and the pon chip detects a dscp value after receiving the converted data message, inquires a VLAN Tag rule table and adds the corresponding VLAN Tag. In the invention, the inner VLAN ID of the data message is inverted by inquiring the VLAN ID conversion table, different VLAN Tags are added to the converted data message by inquiring the VLAN Tag rule table through the pon chip, the function that the data message of the exchange chip which does not support the inner VLAN ID to add different outer VLAN Tags is realized, and the realization of VLAN QinQ is more flexible.

Description

technical field [0001] The present invention relates to the technical field of network equipment management, in particular to a method and system for realizing VLAN (Virtual Local Area Network, Virtual Local Area Network) QinQ. Background technique [0002] Currently, only 12 bits in the VLAN Tag field defined in IEEE802.1Q are used to indicate the VLAN ID of the virtual local area network, so the device can support up to 4094 VLANs. In practical applications, especially in MANs, a large number of VLANs are needed to isolate users, and 4094 VLANs are far from meeting the requirements. [0003] The QinQ feature based on the device port is a simple and flexible Layer 2 VPN (Virtual Private Network, virtual private network) technology. The packets carry two layers of VLAN Tags and traverse the carrier's backbone network (public network). QinQ packets carry double-layer VLAN tags when they are transmitted on the public network. The inner VLAN Tag is the VLAN Tag of the user's ...

AI Technical Summary

Problems solved by technology

[0010] However, in general QinQ, the switch chip only supports simple configuration strategies based on the outer VLAN Tag or the combination of the outer VLAN Tag and the user port, that is, according to the outer VLAN Tag of the received message or the outer VLAN Tag The combination of the packet is used as an identifier to perform operations such as encapsulation, decapsulation, or transformation encapsulation on the message

Therefore, this encapsulation method is relatively rigid, and it is impossible to add different outer VLAN tags to packets with different inner VLAN IDs.

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