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Chapter 3 Customization
Isolate Traffic and Users through VLANs
3-12
User Guide for the Catalyst Express 500 Switches
OL-8122-01
Figure 3-5 Users and Passwords Window
Isolate Traffic and Users through VLANs
These are the concepts and procedures for configuring VLANs:
•
What Is a VLAN, page 3-12
•
VLAN Types, page 3-14
•
Cisco-Guest and Cisco-Voice VLANs, page 3-16
• Create, Modify, and Delete VLANs, page 3-16
• Advanced VLAN Configuration, page 3-17
What Is a VLAN
A virtual local area network (VLAN) is a logical segment of network users and
resources grouped by function, team, or application. This segmentation is without
regard to the physical location of the users and resources. For example, VLANs
can be based on the departments in your company or by sets of users who
communicate mostly with each other.
Using VLANs, you can isolate different types of traffic (such as voice and data)
to preserve the quality of the transmission and to minimize excess traffic among
the logical segments. You can also use VLANs to isolate different types of users.
For example, you can restrict specific data broadcasts to specific logical
workgroups for security purposes, such as keeping information about employee
salaries only to devices in a VLAN created for payroll-related communications.