VLAN (Virtual Local Area Netword) Chinese name "virtual local area network", VLAN is to logically divide the equipment of the local area network into a network segment, thereby realizing the data exchange of the virtual local area network. It is mainly used in switches. Not all switches support VLAN functions. They can only be used on Layer 3 switches that support Layer 3 protocols.
IP-based VLAN division
This method of dividing VLANs is divided according to the network layer address or protocol type of each host (if multi-protocol is supported), although this division method is based on a network address, such as an IP address, but it is not a route, and a network layer Routing has nothing to do with it.
The advantage of this method is that the user's physical location changes, there is no need to reconfigure the VLAN to which it belongs, and VLANs can be divided according to the protocol type, which is important for the network administrator. Also, this method does not require additional Frame tags are used to identify VLANs, which reduces network traffic.
The disadvantage of this method is that it is inefficient because checking the network layer address of each packet requires processing time (relative to the previous two methods), and the general switch chip can automatically check the Ethernet frame of the packet on the network. Head, but to make the chip check the IP header, it requires a higher technology and is more time consuming. Of course, this is related to the implementation methods of various vendors.
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