Intel 480T, User Manual

Page: 90 / 367

88
C H A P T E R 5 Virtual LANs (VLANs)
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.
Types of VLANs
VLANs can be created according to the following criteria:
• Physical port
• 802.1Q tag
• Ethernet, LLC SAP, or LLC/SNAP Ethernet protocol type
• MAC address
• A combination of these criteria
Port-Based VLANs
In a port-based VLAN, a VLAN name is given to a group of one or
more ports on the switch. A port can be a member of only one port-
based VLAN.