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5-2 CHAPTER 5: VIRTUAL LANS (VLANS)
■ It helps 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
need to communicate with each other.
■ It provides 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.
Types of VLANs Switch 3800 VLANs can be created according to the following criteria:
■ Physical port
■ IEEE 802.1Q tag
■ Ethernet protocol type
■ 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 Switch port can be a member of only one
port-based VLAN.
SW3800.BK Page 2 Tuesday, May 5, 1998 5:20 PM