Method for realizing qinq routing termination, switching chip and switch

Abstract

The present invention provides a method for realizing QinQ route termination, a switch chip and a switch. The method includes: ASIC receives a data message to be processed, and the data message includes a destination IP address; the ASIC queries the routing table to determine the corresponding next hop information, The next hop information includes output interface, outer VLAN TAG and Class ID; ASIC determines whether to add inner VLAN TAG to the data packet according to the output interface and outer VLAN TAG; if it needs to add inner VLAN TAG, ASIC will The inner VLAN TAG corresponding to the Class ID is added to the data packet to terminate the routing processing of the data packet. Through this solution, the data packets output by the ASIC route are marked with double tags, and while the route termination is realized on the ASIC, the processing efficiency of the route termination is improved due to the high-speed forwarding of the ASIC.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method for realizing QinQ route termination, a switch chip and a switch. Background technique [0002] At present, only 12 bits in the field of Virtual Local Area Network TAG (VLAN TAG for short) defined in IEEE802.1Q are used to indicate the VLAN ID of the virtual local area network, so a device can support up to 4094 VLANs. In practical applications, especially in MANs, a large number of VLANs are needed to isolate users, but 4094 VLANs are far from meeting the requirements. For this reason, QinQ technology came into being. It encapsulates the VLAN TAG of the user's private network in the VLAN TAG of the public network, so that the packets with two layers of VLAN TAGs are transmitted in the backbone network of the operator. The outer VLAN TAG is propagated, and the user's private network VLAN TAG is shielded. Since the message transmitted in the backbone network has t...

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Problems solved by technology

[0003] However, the existing QinQ route termination is generally implemented by the router through its processor CPU in the form of software forwarding, or through the network processor. On the basis of the switch forwarding the data message, an additional QinQ route termination of data packets is implemented by the device, which not only increases the cost, but also makes the processing efficiency of QinQ route termination lower.

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