CHAPTER
10-1
Catalyst 3750 MetroSwitch Software Configuration Guide
78-15870-01
10
Configuring VLANs
This chapter describes how to configure normal-range VLANs (VLAN IDs 1 to 1005) and
extended-range VLANs (VLAN IDs 1006 to 4094) on the Catalyst 3750 Metro switch. It includes
information about VLAN membership modes, VLAN configuration modes, VLAN trunks, and dynamic
VLAN assignment from a VLAN Membership Policy Server (VMPS).
Note For complete syntax and usage information for the commands used in this chapter, refer to the command
reference for this release.
The chapter includes these sections:
• Understanding VLANs, page 10-1
• Configuring Normal-Range VLANs, page 10-4
• Configuring Extended-Range VLANs, page 10-12
• Displaying VLANs, page 10-16
• Configuring VLAN Trunks, page 10-16
• Configuring VMPS, page 10-28
Understanding VLANs
A VLAN is a switched network that is logically segmented by function, project team, or application,
without regard to the physical locations of the users. VLANs have the same attributes as physical LANs,
but you can group end stations even if they are not physically located on the same LAN segment. Any
switch port can belong to a VLAN, and unicast, broadcast, and multicast packets are forwarded and
flooded only to end stations in the VLAN. Each VLAN is considered a logical network, and packets
destined for stations that do not belong to the VLAN must be forwarded through a router or a switch
supporting fallback bridging, as shown in Figure 10-1. Because a VLAN is considered a separate logical
network, it contains its own bridge MIB information and can support its own implementation of spanning
tree. See Chapter 14, “Configuring STP.”
Note Before you create VLANs, you must decide whether to use VLAN Trunking Protocol (VTP) to maintain
global VLAN configuration for your network. For more information on VTP, see Chapter 11,
“Configuring VTP.”
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