What is VLAN and VLAN Division?
VLAN division is essential in the application of network technology. Many networks need to divide VLANs. Today, JHA Tech will introduce this knowledge in detail.
- Definition of VLAN
VLAN is the abbreviation of Virtual Local Area Network in English, also known as virtual local area network. It is a technology that realizes virtual workgroups by logically rather than physically dividing the devices in the local area network into segments. To divide VLAN, you must purchase network equipment that supports VLAN function.
- VLAN division method
The implementation methods of VLAN on switches can be roughly divided into six categories:
1). VLAN based on port division
This is the most commonly used VLAN division method, which is also the most widely used and effective. At present, most switches with VLAN protocol provide this VLAN configuration method. This method of dividing VLAN is based on the switching port of the Ethernet switch. It divides the physical port on the VLAN switch and the PVC (permanent virtual circuit) port inside the VLAN switch into several groups. Each group constitutes a virtual network, which is equivalent to an independent VLAN switch.
2). VLAN division based on MAC address
This method of VLAN division is based on the MAC address of each host, that is, each host with a MAC address is configured to which group it belongs. The mechanism it implements is that each network card corresponds to a unique MAC address, and the VLAN switch tracks the address belonging to the VLAN MAC. This type of VLAN allows network users to automatically retain their membership in the VLAN when moving from one physical location to another.
3). VLAN division based on network layer protocols
VLANs are divided according to network layer protocols and can be divided into VLAN networks such as IP, IPX, DECnet, AppleTalk, Banyan, etc. This type of VLAN formed by network layer protocols allows the broadcast domain to span multiple VLAN switches. This is very attractive to network administrators who want to organize users for specific applications and services. In addition, users can move freely within the network, but their VLAN membership remains unchanged.
4). Divide VLANs based on IP multicast
IP multicast is actually a definition of VLAN, that is, an IP multicast group is considered to be a VLAN. This method of division expands VLAN to the wide area network, so this method has greater flexibility and is also easy to expand through routers. It is mainly suitable for LAN users who are not in the same geographical range to form a VLAN. It is not suitable for LANs, mainly because of its low efficiency.
5). Divide VLANs based on policies
VLANs based on policy can implement a variety of allocation methods, including VLAN switch ports, MAC addresses, IP addresses, network layer protocols, etc. Network managers can decide which type of VLAN to choose based on their own management mode and the needs of their unit.
6). Divide VLANs based on user definition and non-user authorization
Dividing VLANs based on user definition and non-user authorization means defining and designing VLANs according to the special requirements of specific network users in order to adapt to special VLAN networks, and allowing non-VLAN group users to access VLANs, but they need to provide user passwords and can join a VLAN only after being authenticated by VLAN management.
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