Method of processing packet of virtual lan for network switch

Abstract

The present invention provides a method for processing packets of a virtual LAN in a network switch comprising: first, a packet is received through an input port of the network switch; reading the virtual LAN identification code of the packet; determining the correlative port group of the virtual LAN according to the virtual LAN identification code of the packet, wherein the correlative port group of the virtual LAN represents a group composed of all the ports specially used for processing the packet of the virtual LAN in the network switch; determining the delivering domain of the packet according to the input port of the packet, wherein the delivering domain represents a group composed of all the ports specially used for processing the packet of the first subnetwork in the network switch; finally, determining the output port of the packet according to the correlative port group of the virtual LAN and the delivering domain of the packet.

Description

technical field [0001] This invention relates to network communications, and more particularly to network switches. Background technique [0002] A Virtual Local Area Network (VLAN) is a logically independent network rather than physically independent. Several VLANs can coexist on a physical network switch at the same time. IEEE802.1Q is a communication protocol that regulates virtual local area networks. [0003] Early virtual networks were often used to reduce the size of a single large network segment to reduce collision domains and improve performance. While Ethernet switches solve this problem, virtual networks are used to shrink the broadcast domain of the media access control layer (MAC layer). Another application of virtual networks is to restrict access to network resources independent of the configuration of the physical network, although the effectiveness of this function is debated. [0004] FIG. 1 shows a packet format 100 of the IEEE 802.1Q standard. Field...

AI Technical Summary

Problems solved by technology

However, if there are more than two network segments or physical networks with the same VID connected to the ISP network via a network switch, the network switch will not be able to distinguish these network segments or physical networks with the same VID, and when receiving Problems with network switches occur when packets that should be forwarded to these segments or physical networks

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