VLAN, short for Virtual Local Area Network, is a technology that allows network administrators to logically divide devices within a local area network into separate segments. This enables efficient communication within the virtual network. VLANs are primarily implemented on switches, and not all switches support this feature. Typically, only Layer 3 switches that support Layer 3 protocols can handle VLAN configurations.
IP-based VLAN Division
This method of VLAN segmentation is based on the network layer address or protocol type of each device (if multi-protocol support is available). Although it uses network addresses such as IP addresses, it is not related to routing. The division is purely logical and does not involve routing decisions.
One of the main advantages of this approach is that users can move physically without needing to reconfigure their VLAN membership. Additionally, VLANs can be created based on protocol types, which is particularly useful for network management. Another benefit is that no additional frame tags are required to identify VLANs, which helps reduce overall network traffic.
However, there are some drawbacks. Since this method requires checking the network layer address of each packet, it can be less efficient compared to other VLAN division methods. While most switch chips can automatically process Ethernet frames, analyzing the IP header requires more advanced processing power and time. This efficiency can vary depending on the vendor's implementation.
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