VLAN (short for Virtual Local Area Network). A switch supporting VLAN's lets you logically seperate networks even when using the same physical switch / network infrastructure. Imagine if you had two physical switches which and you have not connected them together but rather have created two physically seperate networks (network A and network B). Using a layer 2 switch which supports VLAN's you are able to setup these two seperate networks on a single switch. This is not so amazing as it could all be done by using two seperate physical switches. It gets amazing when you have multiple networks on multiple switches in multiple locations and most importantly a significantly limited number of physical/virtual links between these locations. Using VLAN tagging, all those networks (VLANS) are able to run over the limited uplinks and all on the same switch hardware. The networks are still logically seperate (unless connected via layer 3 router) but these seperate networks are running on the shared switch / network infrastructure. Basically, VLANS make management of multiple networks straight forward and you are able to utilise your resources more effectively because you have less hardware. This makes management and deployment much simpler (less physical hardware). In particular, when using Meraki, all ports are tagged with all VLAN's by default. This makes things very straight forward to manage and setup. Creating a seperate network (VLAN) is as simple as configuring two ports to be "access" ports on your network (other systems may use other names like untagged ports). For example. if you want to setup VLAN 50 (VLANS normally have numbers associated to identify them), then configuring two or more access ports as VLAN 50 will mean you now have a logically seperate network from the other ports on your switch(s) / network. Honestly, I have never dealt with a system which handles VLANs as well as Meraki Dashboard. The process is so simple. See picture for the bits you need to change to make it all work on a port within the Meraki Dashboard. Go on if you have not made Make a VLAN today, you only need to configure a couple of ports on a single switch and you are up and running. Don't delay try today. There is more to it all as you dive in but getting started is that simple. The great thing about a VLAN, is that in a more advanced setup (multiple switches) it will allow you to expand a LAN to go beyond the way you may typically think of a LAN, for example, you can expand it to span between buildings or even different sites using the existing links you have in place, such private copper, fibre, VPN, etc. Most importantly, because Meraki Dashboard allows configuration beyond switches and also covers MX gateways. If you are using Meraki Switches and also the MX gate ways, everything is configured from the dashboard.
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