Network Administration: VLAN 143
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9
Network Administration: VLAN
This chapter describes how VLANs are configured on the device.
It contains the following topics:
• VLAN Overview
• Standard VLAN
• Voice VLAN
VLAN Overview
A switched network can be logically segmented into multiple VLANs on an
organizational basis, by functions, project teams, or applications rather than
on a physical or geographical basis. For example, all workstations and servers
used by a particular workgroup team can be connected to the same VLAN,
regardless of their physical connections to the network, or the fact that they
might be intermingled with other teams. Reconfiguration of the network can
be done through software rather than by physically unplugging and moving
devices or wires.
A VLAN can be thought of as a Broadcast domain that exists within a defined
set of switches. A VLAN consists of a number of end systems, either hosts or
network equipment (such as bridges and routers), connected by a single
bridging domain. VLANs are supported by VLAN switches that provide
bridging of packets between devices that belong to the same VLAN.
VLANs are created to provide the segmentation services traditionally
provided by routers in LAN configurations. VLANs address scalability,
security, and network management. Routers in VLAN topologies provide
broadcast filtering, security, address summarization, and traffic flow
management.
None of the switches, within a defined group, will bridge any frames, not even
Broadcast frames, between two VLANs.
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