Why Use a Virtual LAN Configuration On Layer 3 Switches

Published on Updated on November 28, 2023

Today, a virtual area network or VLAN has become popular as network complexity has exceeded the capacity of the local area network (LAN). Every system connected in the network sends broadcasts or data packets to communicate with other devices in a broadcast domain. As the number of devices on the network grows, the network becomes latent. This is where VLAN is used to separate broadcast domains virtually, reducing the need to create a separate hardware LAN to overcome a large-broadcast-domain issue. VLAN avoids the physical limitation of a LAN with its virtual nature, allowing an organization to increase their network, segment it for security measures, and reduce network latency. This post discusses step-by-step guidelines required for VLAN configuration. Read on to know more.

Understanding of VLAN Configuration On Layer 3 Switches

A Quick Introduction to Virtual LAN

Before discussing VLAN configuration guidelines, it is essential to know what VLAN is. A VLAN is a set of devices within a network and broadcast domain, reducing the need for a complex subnet system. The main reason for splitting a network into VLANs is to minimize network congestion. Segmenting LANs into more VLANs offers the following advantages:

  • Secures LAN access by limiting network traffic to specific LAN segments
  • Limits broadcast and multicast to the required network and save LAN bandwidth
  • Eases network management by grouping ports across multiple switches

The next section describes the reasons for implementing the VLAN configuration in detail.

Why Use a Virtual LAN Configuration?

There are several reasons to implement a virtual LAN configuration. Some important ones are listed below:

  • Utilization of Link: This is one of the important reasons to use VLANs. Spanning tree protocol (STP) builds a single path using a layer 2 network to prevent loops. If there are several unessential links to aggregating devices, then these links will go unused. One can find these links by building multiple STP topology with different virtual LANs.
  • Service Separation: If you have several devices such as IP phones, desktops, security cameras connecting in a single switch, then a virtual network allows you to separate these services into their subset with ease. This would allow you to use QoS markings to these devices based on VLAN rather than using some higher layer service. Additionally, you can also ACLs algorithm on these devices performing Layer 3 routing to avoid communication between virtual LANs, which might not be required.
  • Subnet Size: If fortunately, a single network grows suddenly, then you can easily break it into different VLANs. This helps reduce the number of hosts needed to process each data transmission.

Know the VLAN Configuration Guidelines in Detail

Setting-up two or more virtual LANs to communicate with each other needs the use of a Layer 3 switch or VLAN-aware router. VLAN configuration can be accomplished in either a web interface or command-line interface (CLI).

VLAN Configuration Guidelines for Web Interface
Setting-up VLAN in the web interface is simple as compared to the CLI interface. All you need to do is perform the following mentioned steps:

  1. Sign in to the web interface through username and password.
  2. Check for the service management and create a new virtual LAN network. Do not forget to set its ID, for instance, set ID as 22 or 43.

VLAN Configuration Guidelines for CLI Interface
SecureCRT software is required to create VLAN through the CLI interface. To perform the VLAN configuration, follow the below-mentioned steps.

  1. Set the parameter of the communication port to get quick access to the startup.
  2. Enter the CLI interface.
  3. Enter global configuration mode and VLAN configures mode.
  4. Do check all the details of VLANs on the networking switch.

The utilization of virtual LANs makes it easy for a network operator to partition a single switched network to match the functional as well as security requirements of the system without changing the existing network infrastructure. VLAN configuration using Layer 3 fiber network switches guarantees reliable and secure data link access to all the network hosts. Thus, it is important to use the right device for achieving the desired outcome. Several manufacturers offer VLAN connectivity solutions. However, they differ in factors such as performance, configuration, and prices. It is always a good idea to source these from trusted manufacturers like VERSITRON. Over the years, the company has been passionately providing networking connectivity solutions.

Rich Tull

Rich Tull
R.W. Tull is the President of Versitron, a leading technology company specializing in data communication and networking solutions. With expertise in Guiding network switches and media converters, R.W. Tull has played a pivotal role in driving Versitron's success. His deep understanding of these technologies has enabled the company to provide innovative and reliable solutions to clients. As a visionary leader, He ensures that Versitron remains at the forefront of the industry, delivering cutting-edge networking solutions that enhance data communication efficiency.
Back to blog