Before understanding, switch VLAN isolation function, we first to understand the ethernet switch: Ethernet switch is based on Ethernet transmission data switch, Ethernet switch each port can be connected to the host, generally work in full duplex mode, can connect to the port at the same time, make each pair of communication equipment can not interfere with each other.
VLAN refers to the virtual local area network, is a set of logical devices and users, the communication between a set of devices and users is similar in the same network segment, can be different locations, different networks, different users together, form a virtual network environment, like using local LAN as convenient, flexible and effective. VLAN can reduce the overhead of moving or changing the location of workstations, especially when some companies with frequent business changes use VLAN, this overhead is greatly reduced
Vlan isolation is actually according to the role of Vlan technology, through the division of different ports, device terminals and users to Vlan business data. In addition, Vlan isolation can be based on the switch port Vlan division network isolation, can also be based on IP Vlan divided network isolation Ethernet switch under the VLAN technology, can build multiple LAN, in real life, want to build different LAN, such as the same company’s r & d, business department, operations department, etc
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