What is Virtual Local Area Network (VLAN)

VLAN is Virtual Local Area Network that relates to broadcasting and isolated with computer networks, which they basically work with network systems when applying tags to frames. Adding one more point that the VLAN works virtually on a physically single network but shows as splits between the networks. As it is a group of end stations with all requirements, not a part of physical location. Basically VLANS are associated with internet protocol subnetworks. Suppose we can have a look at the example that if all end stations belong to the same VLAN then they must be routed with manually assigned on a port-by-port basis.

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We have VLAN ranges that are organized into various ranges which we will use it differently for various purpose. Few VLANs were propagated to other switches in the network when using the trunking protocol which is VLAN trunking protocol, for the Extended- VLANs are not propagated. So, we usually manually create the Extended VLANs on the network. While having a discussion on this we have a few points on the VLAN that for applying on VLAN while implementing.

  • To know how VLANs work we should check with the command show VLAN we can see in detail with few commands such as show VLAN internal usage and show wan VLANs.
  • We have allocations for VLANs that up to 1006 is VLAN ascending internal allocation and then up to 4094 will be descending VLAN allocation.
  • We should enable the extension of system ID for the use of extended-range VLANs.

We can have a look on how the default settings will be in the switches, VLAN ID will be as 1 , range defaultly will be 1 – 4094 while coming to the name its describes as VLAN 1: default and the other VLANs is described as a VLAN “valid id”, the ranges will be 100001- 1004094. The maximum transmission unit size is 1500 ranges between 1500 to 18190, transitional bridges are 1 and 2, VLAN states will be active, suspend.


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