Practical Networking .net

VLANs — Index

The following index of articles all cover various aspects of Virtual Local Area Networks, or VLANs. They are listed here in one place to make it easier to find if you are interested in learning more about VLANs. This handy shortlink has been created which will always take you to this page: Practical Networking […]


Voice VLAN – Auxiliary VLAN

The terms Voice VLAN or Auxiliary VLAN typically mean the same thing: They are a feature which allows an access port — which normally only accepts untagged traffic for a single VLAN — to also accept tagged traffic for a second VLAN. But that is merely the “what”, and if you were simply looking for […]


What is the Native VLAN?

The Native VLAN is an often confused concept, though it needn’t be. This video will explain what the Native VLAN is and how it affects traffic on a wire. Summary An Access port (or “untagged port” in the non Cisco world) is a switch port which carries traffic for only one VLAN. A Trunk port […]


Routing Between VLANs

We wrote an article which covers Virtual Local Area Networks (VLANs) as a concept, and another article on configuring VLANs on Cisco witches. The remaining subject to cover is the different options that exist for routing between VLANs. This is also sometimes called inter-vlan routing, or occasionally Router on a Stick (RoaS). Why do we need Routing Between […]


Configuring VLANs on Cisco Switches

We’ve before written about VLANs and what they can do as a concept. This article will focus on configuring VLANs on Cisco switches. We will look at each command necessary to configure the topology below. If this topology looks familiar, it is because you saw it in the article which described how VLANs operated on […]


Virtual Local Area Networks (VLANs)

Virtual Local Area Networks, or VLANs, are a very simple concept that has been very poorly defined by the industry. This article will explain VLANs from a practical perspective. It will be framed around the two major functions of VLANs, and concluded with an explanation of the idea behind the Native VLAN. Finally, at the […]