VLANS

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 Introduction To VLAN

One or more local area networks can be combined to form a bespoke network called a VLAN. It makes it possible to combine a collection of devices that are spread across several logical networks. As a result, a virtual LAN that is managed similarly to a physical LAN is created. Virtual Local Area Network is the term used to refer to VLAN in its entirety.

A broadcast sent from a host can easily reach all network devices without VLANs. Every single device will process the frames that were broadcast. It may lower overall network security and raise CPU overhead on each device. A broadcast from host A can only reach devices that are present in the same VLAN if you segregate the interfaces on both switches into distinct VLANs. VLAN hosts won't even be aware that communication occurred.

A virtual LAN extension is known as VLAN in networking. A local area network, or LAN, is a collection of computers and related peripherals that are linked together in a specific location, such as a building housing an office or school. For sharing resources like files, printers, games, and other applications, it is a network that is very practical.

How VLAN Works

  • In networking, VLANs are designated by a number.
  • The range is 1 to 4094. You assign ports on a VLAN switch with the correct VLAN number.
  • The switch then permits data to be transmitted between different ports belonging to the same VLAN.
  • There should be a means to transport traffic between switches because practically all networks are bigger than a single switch.
  • Assigning a port on each network switch with a VLAN and connecting a cable between them is one quick and straightforward approach to accomplish this.
Types Of VLANs

1. Port-Based VLAN

By port, port-based VLANs organize virtual local area networks. A switch port can be manually configured in this form of virtual LAN to be a member of VLAN.

Because all other ports are configured with an identical VLAN number, devices connected to this port will be part of the same broadcast domain.

The difficulty with this network architecture is determining which ports are suitable for each VLAN. It is impossible to determine the VLAN membership by simply glancing at a switch's physical port. By looking at the configuration data, you can find out.

2. MAC-Based VLAN

With MAC Based VLAN, untagged inbound packets can be assigned to a virtual LAN and subsequently classified based on the packet source address. By configuring mapping from the MAC entry to the VLAN table, you can define a Mac address to VLAN mapping.

This entry's correct VLAN ID is given using the source Mac address. All device ports share the same table settings.

3. Protocol-Based VLAN

Based on a protocol that can be used to specify filtering criteria for tags, which are untagged packets, this form of VLAN processes traffic.

The layer-3 protocol is carried by the frame in this virtual local area network to determine VLAN membership. It functions in multi-protocol settings. In an IP-based network, this approach is impractical.


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