How are switch VLANs divided?

1. Divide VLAN according to port:

Many network vendors use switch ports to divide VLAN members. As the name suggests, to divide VLAN based on ports is to define certain ports of the switch as a VLAN. The first-generation VLAN technology only supports the division of VLANs on multiple ports of the same switch. The second-generation VLAN technology allows the division of VLANs across multiple different ports of multiple switches. Several ports on different switches can form the same VLAN.

2. Divide VLAN according to MAC address:

 Each network card has a unique physical address in the world, that is, the MAC address. According to the MAC address of the network card, several computers can be divided into the same VLAN. The biggest advantage of this method is that when the user’s physical location moves, that is, when changing from one switch to another, the VLAN does not need to be reconfigured; the disadvantage is that when a certain VLAN is initialized, all users must be configured, and the burden of the network management is compared. Heavy.

3. Divide VLAN according to the network layer:

This method of dividing VLANs is based on the network layer address or protocol type (if multiple protocols are supported) of each host, not based on routing. Note: This VLAN division method is suitable for wide area networks, but not for local area networks.

4. Divide VLAN according to IP multicast:

IP multicast is actually a definition of VLAN, that is, a multicast group is considered to be a VLAN. This division method expands the VLAN to the wide area network, which is not suitable for the local area network, because the scale of the enterprise network has not yet reached such a large scale.