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The normal ethernet packet get extented with an additional field.
This field contains also some priority information, which can be used for routing (eg. audio need real time requirements).
I think most ethernet chips have the capability to send VLAN packets.
VLAN means Virtual LAN. You can create VLAN on VLAN suported devices such as Switches. Therefore you can seperate brodcast domain using VLAN of a same switch then it is very easy to move and change of your network segments without reconfiguring devices. You can add different QoS level to each VLAN. Therefore you can serve selected serves more efficeintly.
You can implement VLAN on
Port Base (selected ports in a SWITCH for one VLAN)
Policy Base ( selected IP range )
Each VLAN carries VLAN tagging for identify traffic for each VLAN.
That is basic concepts of VLAN please raise any if question or refer some books for more details
VLAN which stands for Virtual LAN is defined in the IEEE802.1q standard. It is a technology allowing a company or an individual to extend their LAN over the WAN interface, breaching the physical limitations of regular LAN s.
VLAN technology also allows having several VLANs over a single switch in such a manner that all the LAN will operate in parallel and may not be even aware of each other.
VLAN as can be inferred from the name allows you to create a virtual LAN as which as far as the users are concerned behaves the same way as a regular LAN does. For instance someone in New York could access a printer located in Tel-Aviv using a LAN IP address - as if the printer were just in the next room!
Switched LANs enable us to create VLANs. A VLAN does not completely fit the earlier definition of a LAN as being limited in geographical scope; with a VLAN, geography has no meaning. A VLAN is a logically independent network, and multiple VLANs can coexist on an individual physical switch. VLANs are used extensively in campus networks, allowing users to be part of the same broadcast domain while being physically separated, on different floors of a building, or in different buildings on a campus. This is because a VLAN is defined by software rather than by hardware and physical location. The major difference is that VLANs can restrict the broadcast and collision domain to members of a particular VLAN. .
A switched VLAN is a high-speed, low-latency broadcast group that unites an arbitrary collection of endstations on multiple LAN segments. Switched virtual networking eliminates the bottlenecks normally associated with a physical LAN topology by creating high-speed switched connections between endstations on different LAN segments. Users who want to belong to a particular broadcast domain do not have to be physically located on that LAN segment.
VLANs provide a software-based, value-added function by enabling the creation of a virtual broadcast domain, a shared LAN segment within a switched environment. Switching latencies on VLANs are typically one-tenth those of fast routers. However, routers are still required for inter-VLAN communications.
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