Two types of VLAN membership methods exists and they are Static and Dynamic.
The difference between static and dynamic VLANs are given below.
• Static VLANs: In a static VLAN, the network administrator creates a VLAN and then assigns switch ports to the VLAN. Static VLANs are also called port-based VLANs. The association with the VLAN does not change until the administrator changes the port assignment. End-user devices become the members of VLAN based on the physical switch port to which they are connected.
The ports on a single switch can be assigned multiple VLANs. Even though two devices are connected to different ports on a same switch, traffic will not pass between them if the connected ports are on different VLANs. We need a layer 3 device (typically a router) to enable communication between two VLANs.
• Dynamic VLANs: In a dynamic VLAN, the switch automatically assigns the port to a VLAN using information from the user device like MAC address, IP address etc. When a device is connected to a switch port the switch queries a database to establish VLAN membership. A network administrator must configure VLAN database of a VLAN Membership Policy Server (VMPS).
Dynamic VLANs support instant movability of end devices. When we move a device from a port on one switch to a port on another switch, the dynamic VLANs will automatically configure the membership of the VLAN.