Understanding Vlans - Cisco 2950 - Catalyst Switch Configuration Manual

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 your Catalyst 2950 or Catalyst 2955 switch. It
includes information about VLAN modes and the VLAN Membership Policy Server (VMPS).
For complete syntax and usage information for the commands used in this chapter, refer to the command
Note
reference for this release.
The chapter includes these sections:
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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 bridge as
shown in
information and can support its own implementation of spanning tree. See
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
"Configuring VTP."
78-11380-10
Understanding VLANs, page 17-1
Configuring Normal-Range VLANs, page 17-4
Configuring Extended-Range VLANs, page 17-12
Displaying VLANs, page 17-14
Configuring VLAN Trunks, page 17-15
Configuring VMPS, page 17-25
Figure 17-1. Because a VLAN is considered a separate logical network, it contains its own MIB
and Chapter 15, "Configuring MSTP."
C H A P T E R
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
17
Chapter 14, "Configuring
Chapter 18,
17-1