CHAPTER
11-1
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
11
Configuring VLANs
This chapter describes how to configure VLANs for the Catalyst 6500 series switches.
Note For complete syntax and usage information for the commands that are used in this chapter, refer to the
Catalyst 6500 Series Switch Command Reference publication.
This chapter consists of these sections:
• Understanding How VLANs Work, page 11-1
• Configuring VLANs on the Switch, page 11-4
• Configuring Extended-Range VLANs on the Switch, page 11-6
• Mapping VLANs to VLANs, page 11-8
• Allocating Internal VLANs, page 11-10
• Assigning Switch Ports to a VLAN, page 11-10
• Enabling or Disabling VLAN Port-Provisioning Verification, page 11-12
• Deleting a VLAN, page 11-13
• Configuring VLAN Mappings on a Per-Port or Per-ASIC Basis, page 11-14
• Configuring Private VLANs on the Switch, page 11-19
• Configuring FDDI VLANs on the Switch, page 11-30
• Configuring Token Ring VLANs on the Switch, page 11-31
• Configuring VLANs for the Firewall Services Module, page 11-37
Understanding How VLANs Work
A VLAN is a group of end stations with a common set of requirements, independent of their physical
location. A VLAN has the same attributes as a physical LAN but allows you to group the end stations
even if they are not located physically on the same LAN segment.
A VLAN allows you to group the ports on a switch to limit the unicast, multicast, and broadcast traffic
flooding. The flooded traffic that originates from a particular VLAN is flooded only out the ports that
belong to that VLAN.
Figure 11-1 shows an example of VLANs that are segmented into logically defined networks.
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