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42C4911, January 2007 75
CHAPTER 3
VLANs
This chapter describes network design and topology considerations for using Virtual Local Area
Networks (VLANs). VLANs are commonly 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 77
“VLAN Tagging” on page 80
“VLAN Topologies and Design Considerations” on page 84
This section discusses how you can logically connect users and segments to a host that
supports many logical segments or subnets by using the flexibility of the multiple VLAN
system.
“Protocol-based VLANs” on page 87
NOTE – Basic VLANs can be configured during initial switch configuration (see “Using the
Setup Utility” in the Alteon OS Command Reference). More comprehensive VLAN configura-
tion can be done from the Command Line Interface (see “VLAN Configuration” as well as
“Port Configuration” in the Alteon OS Command Reference).