Difference between static VLAN and dynamic VLAN

Static VLAN vs dynamic VLAN

The virtual local area network (VLAN) is a collection of ports selected by the switch as belonging to the same broadcast domain. Typically, all ports that route traffic to a particular subnet address belong to the same VLAN. Static VLANs are manually configured VLANs providing a name, VLAN ID (VID) and port assignments. Dynamic VLANs are created by storing the hardware addresses of host devices in a database so that the switch can dynamically assign the VLAN at any time when a host is connected to a switch. VLANs allow you to group users based on logical function rather than their physical location.

What is a static VLAN ??

Static VLANs, also known as port-based VLANs, are created by manually assigning ports to a VLAN. When a device is connected to a port, it automatically assumes the VLAN to which the port is assigned. If the user changes the port and still needs to access the same VLAN, the network administrator must manually assign the port to the VLAN. Static VLANs are generally used to reduce broadcast and increase security. Since static VLANs have a small administrative burden and offer satisfactory security compared to traditional switches, they are widely used. Another strong point of static VLANs is the ability to control user movements within a large network.

What is a dynamic VLAN ??

As mentioned earlier, dynamic VLANs are created by assigning the host to a VLAN when a host is connected to a switch using hardware addresses stored in a database. Dynamic VLANs use a central server called VLAN Membership Policy Server (VMPS). VMPS is used to manage the port configurations of each switch on the VLAN. The VMPS server contains a database containing the MAC addresses of all the workstations with the VLAN to which it belongs. This provides a VLAN to MAC address mapping. This mapping scheme allows hosts to roam the network and connect to any switch that is part of the VMPS network while maintaining their VLAN configuration. The initial workload required to configure VMPS is large, which makes dynamic VLANs quite rare. When a host is connected to a switch, the VMPS database is checked for membership in a VLAN before port activation and assignment to a VLAN. This prevents a foreign host from accessing a network by simply plugging a workstation into a wall outlet.

What is the difference between a static VLAN and a dynamic VLAN?

 The main difference between static VLANs and dynamic VLANs is that static VLANs are configured manually by assigning ports to a VLAN, while dynamic VLANs use a database that stores a VLAN / MAC mapping to determine the VLAN to which a particular host is connected. This provides more flexibility in dynamic VLANs, allowing hosts to roam the network as opposed to static networks. However, setting up the VMPS server containing the VLAN to MAC mapping requires a lot of initial work. Because of this overhead, network administrators tend to prefer static VLANs.

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