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CHAPTER 3
VLANs
This chapter describes network design and topology considerations for using Virtual Local Area
Networks (VLANs). VLANs commonly are used to split up groups of network users into man-
ageable broadcast domains, to create logical segmentation of workgroups, and to enforce security
policies among logical segments. The following topics are discussed in this chapter:
“VLANs and Port VLAN ID Numbers” on page 49
“VLAN Tagging” on page 51
“VLAN Topologies and Design Considerations” on page 55
This section discusses how you can connect users and segments to a host that supports
many logical segments or subnets by using the flexibility of the multiple VLAN system.
“Private VLANs” on page 59
NOTE – VLANs can be configured from the Command Line Interface (see “VLAN Configura-
tion” as well as “Port Configuration” in the Command Reference).
