Extreme Networks ExtremeWare XOS 10.1, Руководство пользователя

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ExtremeWare XOS 10.1 Concepts Guide 61
5
Virtual LANs (VLANs)
This chapter covers the following topics:
• Overview of Virtual LANs on page 61
• Types of VLANs on page 62
•
VLAN Names on page 70
• Configuring VLANs on the Switch on page 71
• Displaying VLAN Settings on page 72
Setting up Virtual Local Area Networks (VLANs) on the switch eases many time-consuming tasks of
network administration while increasing efficiency in network operations.
Overview of Virtual LANs
The term “VLAN” is used to refer to a collection of devices that communicate as if they were on the
same physical LAN. Any set of ports (including all ports on the switch) is considered a VLAN. LAN
segments are not restricted by the hardware that physically connects them. The segments are defined by
flexible user groups you create with the command line interface.
Benefits
Implementing VLANs on your networks has the following advantages:
• VLANs help to control traffic—
With traditional networks, congestion can be caused by broadcast
traffic that is directed to all network devices, regardless of whether they require it. VLANs increase
the efficiency of your network because each VLAN can be set up to contain only those devices that
must communicate with each other.
• VLANs provide extra security— Devices within each VLAN can only communicate with member
devices in the same VLAN. If a device in VLAN Marketing must communicate with devices in VLAN
Sales, the traffic must cross a routing device.
• VLANs ease the change and movement of devices— With traditional networks, network
administrators spend much of their time dealing with moves and changes. If users move to a
different subnetwork, the addresses of each endstation must be updated manually.